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This paper proposed a more-accurate-than-conventional measurement technique for determining electrical power across exceptionally high-impedance of triboelectric energy harvester (TEH). The key idea of this proposed technique was to measure the voltage across an introduced, parallelly-connected resistor divider to the oscilloscope instead of the voltage across the harvester. An experiment was set up to verify the measurement accuracy performance of this technique against the ideal theoretical values. The maximum percentage error found was only 2.30%, while the conventional measurement technique could not be used to measure voltage across high impedance TEH at all because the readings were not accurate, i.e., the measurement error would be at least over 10%. Therefore, we concluded that this proposed technique should always be used instead of the conventional measurement technique for power measurement of any TEH. A suggestion that we would like to offer to researchers investigating or developing a TEH is that, in using our measurement technique, a good starting point for a load to probe resistance ratio is 1:10, a ratio that worked well for our TEH test bench that we developed.
Subhawat Jayasvasti; Panu Thainiramit; Phonexai Yingyong; Don Isarakorn. Technique for Measuring Power across High Resistive Load of Triboelectric Energy Harvester. Micromachines 2021, 12, 766 .
AMA StyleSubhawat Jayasvasti, Panu Thainiramit, Phonexai Yingyong, Don Isarakorn. Technique for Measuring Power across High Resistive Load of Triboelectric Energy Harvester. Micromachines. 2021; 12 (7):766.
Chicago/Turabian StyleSubhawat Jayasvasti; Panu Thainiramit; Phonexai Yingyong; Don Isarakorn. 2021. "Technique for Measuring Power across High Resistive Load of Triboelectric Energy Harvester." Micromachines 12, no. 7: 766.
This work investigated the mechanical and electrical behaviors of piezoelectric and triboelectric energy harvesters (PEHs and TEHs, respectively) as potential devices for harvesting impact-driven energy. PEH and TEH test benches were designed and developed, aiming at harvesting low-frequency mechanical vibration generated by human activities, for example, a floor-tile energy harvester actuated by human footsteps. The electrical performance and behavior of these energy harvesters were evaluated and compared in terms of absolute energy and power densities that they provided and in terms of these energy and power densities normalized to unit material cost. Several aspects related to the design and development of PEHs and TEHs as the energy harvesting devices were investigated, covering the following topics: construction and mechanism of the energy harvesters; electrical characteristics of the fabricated piezoelectric and triboelectric materials; and characterization of the energy harvesters. At a 4 mm gap width between the cover plate and the stopper (the mechanical actuation components of both energy harvesters) and a cover plate pressing frequency of 2 Hz, PEH generated 27.64 mW, 1.90 mA, and 14.39 V across an optimal resistive load of 7.50 kΩ, while TEH generated 1.52 mW, 8.54 µA, and 177.91 V across an optimal resistive load of 21 MΩ. The power and energy densities of PEH (4.57 mW/cm3 and 475.13 µJ/cm3) were higher than those of TEH (0.50 mW/cm3, and 21.55 µJ/cm3). However, when the material cost is taken into account, TEH provided higher power and energy densities per unit cost. Hence, it has good potential for upscaling, and is considered well worth the investment. The advantages and disadvantages of PEH and TEH are also highlighted as main design factors.
Panu Thainiramit; Phonexai Yingyong; Don Isarakorn. Impact-Driven Energy Harvesting: Piezoelectric Versus Triboelectric Energy Harvesters. Sensors 2020, 20, 5828 .
AMA StylePanu Thainiramit, Phonexai Yingyong, Don Isarakorn. Impact-Driven Energy Harvesting: Piezoelectric Versus Triboelectric Energy Harvesters. Sensors. 2020; 20 (20):5828.
Chicago/Turabian StylePanu Thainiramit; Phonexai Yingyong; Don Isarakorn. 2020. "Impact-Driven Energy Harvesting: Piezoelectric Versus Triboelectric Energy Harvesters." Sensors 20, no. 20: 5828.
This paper introduces the design and characterization of a double-stage energy harvesting floor tile that uses a piezoelectric cantilever to generate electricity from human footsteps. A frequency up-conversion principle, in the form of an overshooting piezoelectric cantilever, plucked with a proof mass is utilized to increase energy conversion efficiency. The overshoot of the proof mass is implemented by a mechanical impact between a moving cover plate and a stopper to prevent damage to the plucked piezoelectric element. In an experiment, the piezoelectric cantilever of a floor tile prototype was excited by a pneumatic actuator that simulated human footsteps. The key parameters affecting the electrical power and energy outputs were investigated by actuating the prototype with a few kinds of excitation input. It was found that, when actuated by a single simulated footstep, the prototype was able to produce electrical power and energy in two stages. The cantilever resonated at a frequency of 14.08 Hz. The output electricity was directly proportional to the acceleration of the moving cover plate and the gap between the cover plate and the stopper. An average power of 0.82 mW and a total energy of 2.40 mJ were obtained at an acceleration of 0.93 g and a gap of 4 mm. The prototype had a simple structure and was able to operate over a wide range of frequencies.
Don Isarakorn; Subhawat Jayasvasti; Phosy Panthongsy; Pattanaphong Janphuang; Kazuhiko Hamamoto. Design and Evaluation of Double-Stage Energy Harvesting Floor Tile. Sustainability 2019, 11, 5582 .
AMA StyleDon Isarakorn, Subhawat Jayasvasti, Phosy Panthongsy, Pattanaphong Janphuang, Kazuhiko Hamamoto. Design and Evaluation of Double-Stage Energy Harvesting Floor Tile. Sustainability. 2019; 11 (20):5582.
Chicago/Turabian StyleDon Isarakorn; Subhawat Jayasvasti; Phosy Panthongsy; Pattanaphong Janphuang; Kazuhiko Hamamoto. 2019. "Design and Evaluation of Double-Stage Energy Harvesting Floor Tile." Sustainability 11, no. 20: 5582.
This paper introduces the feasibility examination of indoor positioning system using the Bluetooth low energy (BLE) and the radio-frequency identification (RFID) devices to further apply in the diagnosis of neurodegenerative disease leading an unusual human body motion. Experimentally, a BLE module and a RFID tag are simulated to be the wearable devices mounted to human body, moving with common body motions. Their movements affecting on position tracking efficiency are investigated through smartphone and ultra-high frequency RFID reader, respectively. The results show that a BLE device presents the best position sensing ability.
Subhawat Jayasvasti; Don Isarakorn. Indoor Positioning System on Identification of Neurodegenerative Disease: A Comparative Study of BLE versus RFID. 2019 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST) 2019, 1 -4.
AMA StyleSubhawat Jayasvasti, Don Isarakorn. Indoor Positioning System on Identification of Neurodegenerative Disease: A Comparative Study of BLE versus RFID. 2019 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST). 2019; ():1-4.
Chicago/Turabian StyleSubhawat Jayasvasti; Don Isarakorn. 2019. "Indoor Positioning System on Identification of Neurodegenerative Disease: A Comparative Study of BLE versus RFID." 2019 5th International Conference on Engineering, Applied Sciences and Technology (ICEAST) , no. : 1-4.
This study explored the preparation and electrical properties of 0–3 barium titanate/polydimethylsiloxane nanocomposites by dispersing barium titanate nanoparticles (BaTiO3; BT) into the polydimethylsiloxane (PDMS) matrix phase. The effect of barium titanate nanoparticles on electrical properties has been investigated systematically, and the relative permittivity of nanocomposites was found to increase significantly with increasing barium titanate content. Different theoretical models were used to predict the dielectric constant of these composites and compare their experimental value with the theoretical value in order to find an appropriate equation. The result indicated that the dielectric properties of composites are influenced not only by relative permittivity of the components but also dependence on interactions between ceramics and polymers. Furthermore, the preparation and dielectric properties of BT/PDMS nanocomposites modified with carbon nanotube (CNT) were also studied. The dielectric results demonstrate that adding CNT can enhance the relative permittivity of the BT/PDMS composite via improvement of dispersion and distribution of the BT nanoparticles in the PDMS matrix phase. Moreover, the electrical outputs from the BT/PDMS/CNT nanocomposites generator were measured under periodic knocking. The nanocomposites innovatively expand the feasibility of self-powered energy systems for smart sensor and energy harvesting applications.
Chanisa Nawanil; Worawut Makcharoen; Krittanat Khaosa-Ard; Tosapol Maluangnont; Wanwilai Vittayakorn; Don Isarakorn; Naratip Vittayakorn. Electrical and dielectric properties of barium titanate – polydimethylsiloxane nanocomposite with 0-3 connectivity modified with carbon nanotube (CNT). Integrated Ferroelectrics 2019, 195, 46 -57.
AMA StyleChanisa Nawanil, Worawut Makcharoen, Krittanat Khaosa-Ard, Tosapol Maluangnont, Wanwilai Vittayakorn, Don Isarakorn, Naratip Vittayakorn. Electrical and dielectric properties of barium titanate – polydimethylsiloxane nanocomposite with 0-3 connectivity modified with carbon nanotube (CNT). Integrated Ferroelectrics. 2019; 195 (1):46-57.
Chicago/Turabian StyleChanisa Nawanil; Worawut Makcharoen; Krittanat Khaosa-Ard; Tosapol Maluangnont; Wanwilai Vittayakorn; Don Isarakorn; Naratip Vittayakorn. 2019. "Electrical and dielectric properties of barium titanate – polydimethylsiloxane nanocomposite with 0-3 connectivity modified with carbon nanotube (CNT)." Integrated Ferroelectrics 195, no. 1: 46-57.
Parinya Wattananukulchai; Don Isarakorn. Performance Evaluation Using Laser Doppler Vibrometer Sensing Technique on Advanced Lead Magnesium Niobate-lead Titanate Piezoelectric-material-based Microactuator for Hard Drive Head. Sensors and Materials 2018, 30, 2183 .
AMA StyleParinya Wattananukulchai, Don Isarakorn. Performance Evaluation Using Laser Doppler Vibrometer Sensing Technique on Advanced Lead Magnesium Niobate-lead Titanate Piezoelectric-material-based Microactuator for Hard Drive Head. Sensors and Materials. 2018; 30 (10):2183.
Chicago/Turabian StyleParinya Wattananukulchai; Don Isarakorn. 2018. "Performance Evaluation Using Laser Doppler Vibrometer Sensing Technique on Advanced Lead Magnesium Niobate-lead Titanate Piezoelectric-material-based Microactuator for Hard Drive Head." Sensors and Materials 30, no. 10: 2183.
This paper presents the development of a polymer based microneedle patch for transdermal drug delivery application using plastic microinjection moulding. Design and analysis of the microneedle cavities and mould insert used in the injection moulding process were carried out using Computer-Aided Engineering (CAE) software. A mould insert with low surface roughness was fabricated using Micro Electrical Discharge Machining (μ-EDM). The injection moulding parameters including clamping force, temperature, injection pressure and velocity were characterized in order to obtain the optimum reproducibility. Solid truncated cone microneedles, made of biocompatible polymethyl methacrylate (PMMA), with a round tip radius of 50 μm and 500 μm in height have been realized by microinjection moulding process demonstrating the potential of a low cost, high production efficiency, and suitable for mass production. In addition, a mould insert of cylindrical microneedles fabricated using X-ray LIGA has been proposed.
Pattanaphong Janphuang; Mongkhol Laebua; Chanwut Sriphung; Phatsakon Taweewat; Anan Sirichalarmkul; Kasiphisan Sukjantha; Napatporn Promsawat; Pimchanok Leuasoongnoen; Somphong Suphachiaraphan; Kantapon Phimol; Don Isarakorn; Somchai Tancharakorn. Polymer based microneedle patch fabricated using microinjection moulding. MATEC Web of Conferences 2018, 192, 01039 .
AMA StylePattanaphong Janphuang, Mongkhol Laebua, Chanwut Sriphung, Phatsakon Taweewat, Anan Sirichalarmkul, Kasiphisan Sukjantha, Napatporn Promsawat, Pimchanok Leuasoongnoen, Somphong Suphachiaraphan, Kantapon Phimol, Don Isarakorn, Somchai Tancharakorn. Polymer based microneedle patch fabricated using microinjection moulding. MATEC Web of Conferences. 2018; 192 ():01039.
Chicago/Turabian StylePattanaphong Janphuang; Mongkhol Laebua; Chanwut Sriphung; Phatsakon Taweewat; Anan Sirichalarmkul; Kasiphisan Sukjantha; Napatporn Promsawat; Pimchanok Leuasoongnoen; Somphong Suphachiaraphan; Kantapon Phimol; Don Isarakorn; Somchai Tancharakorn. 2018. "Polymer based microneedle patch fabricated using microinjection moulding." MATEC Web of Conferences 192, no. : 01039.
This work focuses on the diagnosis of energy consumption of commonly used microcontrollers with various driving clock-frequency. The interaction among the driving clock-frequency, processing time and current consumption are determined to be a guidance for the design of low-power wireless sensor applications. In implementation, the microcontrollers are supposed to process the data following the operational procedures of wireless sensor application, which is programmed to solve mathematical equation with various driving clock-frequencies, and then sleep to reduce the power consumption. With a single circle procession, the current consumption at each driving clock-frequency are captured and analyzed. As the results, the current consumption is proportional to the driving clock-frequency, however energy consumption is minimized at highest clock-frequency.
Subhawat Jayasvasti; Don Isarakorn. Study of Interaction Between Operational Clock-Frequency and Energy Consumption of Microcontrollers for Wireless Sensor Applications. MATEC Web of Conferences 2018, 192, 02042 .
AMA StyleSubhawat Jayasvasti, Don Isarakorn. Study of Interaction Between Operational Clock-Frequency and Energy Consumption of Microcontrollers for Wireless Sensor Applications. MATEC Web of Conferences. 2018; 192 ():02042.
Chicago/Turabian StyleSubhawat Jayasvasti; Don Isarakorn. 2018. "Study of Interaction Between Operational Clock-Frequency and Energy Consumption of Microcontrollers for Wireless Sensor Applications." MATEC Web of Conferences 192, no. : 02042.
This paper reports on the fabrication and evaluation of an energy harvesting floor tile using unimorph PZT piezoelectric cantilevers to convert kinetic energy from human footsteps into usable electricity. The operation of the tile is based on frequency up-converting mechanism in which low frequency input vibrations are converted into high frequency vibrations of an electromechanical transduction. The operational frequency of the PZT unimorph cantilever was converted up by an interaction between a permanent magnet and an iron bar. Vertical displacement of the oscillating cantilever was localized with a stopper preventing damage to the piezoelectric layer from shock or over-displacement excitation. The magnetic field density between the magnet and the iron bar was investigated through finite element analysis simulation in order to define an optimal air gap. Experimentally, a unimorph PZT cantilever was initially prototyped to validate the design. The results showed a successful frequency up-conversion with a resonant frequency of 10.54 Hz. Then, it was scaled up by accommodating 24 unimorph PZT cantilevers followed by experimental validation to evaluate its energy harvesting performance. Each cantilever was connected to a full wave bridge rectifier then connected in parallel with the other cantilevers. The generated electrical power and energy were investigated through various resistive loads. The average power and total output energy produced by one foot step on the tile were found to be 1.24 mW and 3.49 mJ, respectively at an optimal load resistance of 74.44 kΩ. The energy conversion efficiency reached 17.12% demonstrating the potential of harvesting energy from human motion.
Phosy Panthongsy; Don Isarakorn; Pattanaphong Janphuang; Kazuhiko Hamamoto. Fabrication and evaluation of energy harvesting floor using piezoelectric frequency up-converting mechanism. Sensors and Actuators A: Physical 2018, 279, 321 -330.
AMA StylePhosy Panthongsy, Don Isarakorn, Pattanaphong Janphuang, Kazuhiko Hamamoto. Fabrication and evaluation of energy harvesting floor using piezoelectric frequency up-converting mechanism. Sensors and Actuators A: Physical. 2018; 279 ():321-330.
Chicago/Turabian StylePhosy Panthongsy; Don Isarakorn; Pattanaphong Janphuang; Kazuhiko Hamamoto. 2018. "Fabrication and evaluation of energy harvesting floor using piezoelectric frequency up-converting mechanism." Sensors and Actuators A: Physical 279, no. : 321-330.
In the latest high-density hard disk drives (HDDs), the piezoelectric actuator of head gimbal assembly (HGA) is the key technology for precisely positioning the magnetic head. To increase HDD's areal density, a smaller track pitch and a faster spindle speed should be used but the faster the spindle rotates the larger the disturbance is. Hence, a newer PMN-PT piezoelectric actuator is needed to overcome the displacement bandwidth limitation restricted by the current PZT piezoelectric actuator. This paper investigated the reliability and performance of PMN-PT piezoelectric single crystal that was implemented on the a commercial HGA for the first time in an experiment. The objectives were to ensure that PMN-PT would not crack during the HDD assembly process and the performance of HDD equipped with this material was still reliable under thermal degradation. From the experiments on a prototype HGA, it was found that PMN-PT had a high degradation temperature of 150°C and was 2 times harder than PZT piezoelectric.
Parinya Wattananukulchai; Don Isarakorn. Reliability of PMN-PT Piezoelectric Material as an Actuator for High Density Hard Disk Drive. 2018 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) 2018, 188 -192.
AMA StyleParinya Wattananukulchai, Don Isarakorn. Reliability of PMN-PT Piezoelectric Material as an Actuator for High Density Hard Disk Drive. 2018 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). 2018; ():188-192.
Chicago/Turabian StyleParinya Wattananukulchai; Don Isarakorn. 2018. "Reliability of PMN-PT Piezoelectric Material as an Actuator for High Density Hard Disk Drive." 2018 15th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) , no. : 188-192.
Diabetic retinopathy is one of the most frequent causes of blindness due to diabetes. Primary screening is essential due to prerequisite step toward the diagnosis of diabetic retinopathy in order to prevent vision loss or blindness. This paper presents the methods to discriminate between healthy images and diabetic retinopathy images on the retinal images. The proposed method involves three main steps. Initially, the image is preprocessed to remove small noises and enhance the contrast of the image. Secondly, Kirsch edge detection is utilized to detect the bright lesions. Subsequently, the red lesions are detected depending on top-hat morphological filtering methods. Then the bright and dark lesions are combined by using logical AND operator. In order to be left only pathological signs, the noises near the vicinity of the optic disc and blood vessels are further removed using blob analysis. Finally, morphological features are extracted and fed to the SVM classifier. The proposed method was evaluated with three datasets containing 229 images. It achieved the accuracy of 90%, sensitivity of 86.33% and specificity of 98.55% with the average computational time 8 seconds per image. The method is simple and fast, easy to implement and the result is promising.
Syna Sreng; Noppadol Maneerat; Don Isarakorn; Kazuhiko Hamamoto; Ronakorn Panjaphongse. Primary screening of diabetic retinopathy based on integrating morphological operation and support vector machine. 2017 International Conference on Intelligent Informatics and Biomedical Sciences (ICIIBMS) 2017, 250 -254.
AMA StyleSyna Sreng, Noppadol Maneerat, Don Isarakorn, Kazuhiko Hamamoto, Ronakorn Panjaphongse. Primary screening of diabetic retinopathy based on integrating morphological operation and support vector machine. 2017 International Conference on Intelligent Informatics and Biomedical Sciences (ICIIBMS). 2017; ():250-254.
Chicago/Turabian StyleSyna Sreng; Noppadol Maneerat; Don Isarakorn; Kazuhiko Hamamoto; Ronakorn Panjaphongse. 2017. "Primary screening of diabetic retinopathy based on integrating morphological operation and support vector machine." 2017 International Conference on Intelligent Informatics and Biomedical Sciences (ICIIBMS) , no. : 250-254.
Thapanun Sudhawiyangkul; Don Isarakorn. Design and realization of an energy autonomous wireless sensor system for ball screw fault diagnosis. Sensors and Actuators A: Physical 2017, 258, 49 -58.
AMA StyleThapanun Sudhawiyangkul, Don Isarakorn. Design and realization of an energy autonomous wireless sensor system for ball screw fault diagnosis. Sensors and Actuators A: Physical. 2017; 258 ():49-58.
Chicago/Turabian StyleThapanun Sudhawiyangkul; Don Isarakorn. 2017. "Design and realization of an energy autonomous wireless sensor system for ball screw fault diagnosis." Sensors and Actuators A: Physical 258, no. : 49-58.
The piezoelectric actuator technology for moving the read-write head of Hard Disk Drive (HDD) is very important and widely used. Advanced high-performance technologies for the actuator and servo control are required in order to achieve not only accurate positioning control on data tracks but also high-speed access onto another data track. There is strong demand for hard disk drives with high-speed access performance, which generally requires actuators with a wider servo bandwidth. This paper focuses on the comparative piezoelectric materials based unimorph actuators with classical piezo (Poly crystalline PZT) and newer piezo (Single-crystalline PMN-PT) ceramics. The advantages of piezoelectric materials in terms of mechanical and electrical characteristics aiming at a useful compromise performance displacement and resonant frequency are studied and analyzed.
Parinya Wattananukulchai; Don Isarakorn. A comparative study based on classical and newer piezoelectric materials based unimorph actuators for Hard Disk Drive. 2016 IEEE Region 10 Conference (TENCON) 2017, 3464 -3467.
AMA StyleParinya Wattananukulchai, Don Isarakorn. A comparative study based on classical and newer piezoelectric materials based unimorph actuators for Hard Disk Drive. 2016 IEEE Region 10 Conference (TENCON). 2017; ():3464-3467.
Chicago/Turabian StyleParinya Wattananukulchai; Don Isarakorn. 2017. "A comparative study based on classical and newer piezoelectric materials based unimorph actuators for Hard Disk Drive." 2016 IEEE Region 10 Conference (TENCON) , no. : 3464-3467.
This paper presents a comparison between pierce oscillator and impedance analysis techniques for measuring the frequency of the quartz crystal. The QCM analyzer based on pierce oscillator is designed, realized, and then compared to the impedance analyzer (Type bode 100). The comparison is focused on accuracy and precision of measurement. The pierce oscillator in a completed-chip is employed in the QCM analyzing device in order to simplify the circuit of system. The frequency drift and standard deviation (SD) values which are obtained from resonant frequency measurement are studied in order to investigate the accurate and precise measurement of devices. In the experiment, an AT-cut quartz disc of crystal oscillator package HC49U is unloaded and loaded while it is being measured the frequency. From the experimental results, the QCM analyzer based on pierce oscillator and impedance analyzer have the approximate accuracy and precision of measurement. The QCM analyzer based on pierce oscillator has lower sensitivity due to the frequency drift.
Subhawat Jayasvasti; Don Isarakorn; Songmoung Nundrakwang. Comparative study of QCM analyzers based on pierce oscillator and electromechanical impedance techniques. 2016 9th Biomedical Engineering International Conference (BMEiCON) 2016, 1 -4.
AMA StyleSubhawat Jayasvasti, Don Isarakorn, Songmoung Nundrakwang. Comparative study of QCM analyzers based on pierce oscillator and electromechanical impedance techniques. 2016 9th Biomedical Engineering International Conference (BMEiCON). 2016; ():1-4.
Chicago/Turabian StyleSubhawat Jayasvasti; Don Isarakorn; Songmoung Nundrakwang. 2016. "Comparative study of QCM analyzers based on pierce oscillator and electromechanical impedance techniques." 2016 9th Biomedical Engineering International Conference (BMEiCON) , no. : 1-4.
The piezoelectric energy harvester for supplying power to low-power electronic devices, especially low-power wireless sensor node has been studied and received more attraction over the past decade. In order to simplify installation and obtain the sufficient power for systems, the harvester possessing simple structure with highest output power is highly required. The aim of this study is to design and compare the characteristic and performance of piezoelectric polycrystalline PZT and single-crystalline PMN-PT energy harvesters based on unimorph configuration. By utilizing ANSYS® for finite element analysis (FEA), the numerical model of composite piezoelectric unimorph generators with proof mass exciting at resonant frequency 150 Hz are designed and then fabricated. For the energy harvesting experiment, the prototypes of harvesters are mounted to the electromagnetic shaker and inputted the vibration with vary frequencies and accelerations. As the results, the piezoelectric single-crystalline PMN-PT unimorph energy harvester has the higher energy density which is 352.85 J/gm3, while the piezoelectric polycrystalline PZT unimorph energy harvester has 8.44 J/gm3.
Phosy Panthongsy; Don Isarakorn. Comparative study of piezoelectric energy harvesters based on polycrystalline PZT and single-crystalline PMN-PT materials. 2016 13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) 2016, 1 -5.
AMA StylePhosy Panthongsy, Don Isarakorn. Comparative study of piezoelectric energy harvesters based on polycrystalline PZT and single-crystalline PMN-PT materials. 2016 13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). 2016; ():1-5.
Chicago/Turabian StylePhosy Panthongsy; Don Isarakorn. 2016. "Comparative study of piezoelectric energy harvesters based on polycrystalline PZT and single-crystalline PMN-PT materials." 2016 13th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) , no. : 1-5.
Over the past few years, using piezoelectric elements to harvest energy from ambient vibrations has been of great interest. However, there are significant challenges in converting the power generated from the piezoelectric elements to usable form. This paper discusses the design and fabrication of off-line power supply based on a self-oscillating flyback converter. An energy management circuit was upgraded for employing in the low power generators as piezo buzzer. Since the cost per unit of the existent energy management circuit is more expensive. Therefore, this research is also to concentrate on the design of a low-cost energy management circuit that the cost is lowers than 1 USD. The primary feedback self-oscillating flyback converter was considered due to its simplicity and low component count. In addition, this circuit also operates as buck-boost converter which is more appropriate for integrating to low power generator with unsteady and low output voltage. For the experimental setup, the circuit was defined to work with 2.5-5 V input voltage. It is able to achieve the good output voltage regulation 5 V +/-6% at the 10 mA maximum current consumption of load.
B. Khemmanee; Don Isarakorn. Low-cost energy management circuit base on primary feedback self-oscillating flyback converter for piezoelectric energy harvesting. 2015 18th International Conference on Electrical Machines and Systems (ICEMS) 2015, 1035 -1038.
AMA StyleB. Khemmanee, Don Isarakorn. Low-cost energy management circuit base on primary feedback self-oscillating flyback converter for piezoelectric energy harvesting. 2015 18th International Conference on Electrical Machines and Systems (ICEMS). 2015; ():1035-1038.
Chicago/Turabian StyleB. Khemmanee; Don Isarakorn. 2015. "Low-cost energy management circuit base on primary feedback self-oscillating flyback converter for piezoelectric energy harvesting." 2015 18th International Conference on Electrical Machines and Systems (ICEMS) , no. : 1035-1038.
This paper proposes methods to detect hemorrhages which are known as a kind of lesions in diabetic retinopathy. To detect the symptom, eye fundus structures (blood vessels and fovea) as well as microaneuysms need to be discriminated to filter out only the hemorrhages. Five processing steps are proposed based analysis on fundus images. First, preprocessing step is processed to improve the quality of the image. Then all red features are filtered out. They include blood vessels, fovea, microaneurysms and hemorrhages. After that, morphology operation and compactness measurement are applied to eliminate the fovea, and blood vessels. Finally, hemorrhages can be classified by using area method to remove microaneurysms and some small noise. 579 fundus images from Bhumibol Adulyadej Hospital were tested. The results were analysis by ophthalmologist in order to define system accuracy and preciseness. According to results of comparison, we found that the accuracy is 90 % and the average of processing time is 6.23 seconds per image.
Syna Sreng; Noppadol Maneerat; Don Isarakorn; Kazuhiko Hamamoto; Ronakorn Panjaphongse. Automatic hemorrhages detection based on fundus images. 2015 7th International Conference on Information Technology and Electrical Engineering (ICITEE) 2015, 253 -257.
AMA StyleSyna Sreng, Noppadol Maneerat, Don Isarakorn, Kazuhiko Hamamoto, Ronakorn Panjaphongse. Automatic hemorrhages detection based on fundus images. 2015 7th International Conference on Information Technology and Electrical Engineering (ICITEE). 2015; ():253-257.
Chicago/Turabian StyleSyna Sreng; Noppadol Maneerat; Don Isarakorn; Kazuhiko Hamamoto; Ronakorn Panjaphongse. 2015. "Automatic hemorrhages detection based on fundus images." 2015 7th International Conference on Information Technology and Electrical Engineering (ICITEE) , no. : 253-257.
In recent years, wireless sensor network is used in a variety of applications and highly required. These wireless sensor network is powered by the battery with limit energy. Therefore, the integration of energy harvester and wireless sensor network has received more attention because it can prolong the lifetime of battery in a sensor node. The focus of this paper is to design the energy harvesting device from machine vibrations for wireless sensor node, which the amplitude and frequency of vibration source were contributed on the design. The structure of energy harvesting devices is a resonant type piezoelectric energy harvester with a proof mass at the tip of the beam for tuning its resonant frequency. The proposed piezoelectric energy harvesters were then designed and analyzed by using Finite Element Method (FEM) to optimize the natural frequency of the harvester. Then, the prototype energy harvesters were made and mounted to a vibration source for experiments. The result reveals that the optimal piezoelectric energy harvester can generate the output power of 82.29 μW at the resonant frequency of 50 Hz.
Phosy Panthongsy; Don Isarakorn; Thapanun Sudhawiyangkul; Songmoung Nundrakwang; Panthongsy Phosy. Piezoelectric energy harvesting from machine vibrations for wireless sensor system. 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) 2015, 1 -6.
AMA StylePhosy Panthongsy, Don Isarakorn, Thapanun Sudhawiyangkul, Songmoung Nundrakwang, Panthongsy Phosy. Piezoelectric energy harvesting from machine vibrations for wireless sensor system. 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON). 2015; ():1-6.
Chicago/Turabian StylePhosy Panthongsy; Don Isarakorn; Thapanun Sudhawiyangkul; Songmoung Nundrakwang; Panthongsy Phosy. 2015. "Piezoelectric energy harvesting from machine vibrations for wireless sensor system." 2015 12th International Conference on Electrical Engineering/Electronics, Computer, Telecommunications and Information Technology (ECTI-CON) , no. : 1-6.
This paper presents an analytical and experimental study of a compact configuration to harvest energy from a rotating gear using piezoelectric microelectromechanical system harvesters. The reported configuration realizes a contact-type frequency up-conversion mechanism in order to generate useful electrical energy. The up-conversion mechanism was achieved using an atomic force microscope (AFM)-like piezoelectric cantilever plucked by the teeth of the rotating gear that could be eventually driven by an oscillating mass. This paper describes relevant design guidelines for harvesting energy from the low-frequency mechanical movement of a rotating gear through analytical modeling and finite element method (FEM) simulation followed by experimental validation. Different harvester configurations are investigated to identify the optimal configuration in terms of the output energy and energy conversion efficiency. The latter results are reported for the first time because of the implementation of an original concept based on the coupling of the harvester with a rotational flywheel. The experimental results reveal that free vibrations of the harvester after plucking contribute significantly to the output energy and efficiency. By adding a proof mass, the efficiency of the system can be greatly improved. For plucking speeds between 3 and 19 r/s, average output powers in the order of tens of microwatts were obtained for continuous plucking. By combining interaction energy, friction, and energy absorption, between the harvester and inertial mass, the maximum efficiency of the impact piezoelectric harvesters was found to be 1.4%. The efficiency results obtained were compared with the noncontact magnetic plucking approach further demonstrating the potential of our concept. Finally, different tip-gear materials combinations were evaluated showing the importance of their nature on the reliability of the presented configuration.
Pattanaphong Janphuang; Robert A. Lockhart; Don Isarakorn; Simon Henein; Danick Briand; Nico F. De Rooij. Harvesting Energy From a Rotating Gear Using an AFM-Like MEMS Piezoelectric Frequency Up-Converting Energy Harvester. Journal of Microelectromechanical Systems 2014, 24, 742 -754.
AMA StylePattanaphong Janphuang, Robert A. Lockhart, Don Isarakorn, Simon Henein, Danick Briand, Nico F. De Rooij. Harvesting Energy From a Rotating Gear Using an AFM-Like MEMS Piezoelectric Frequency Up-Converting Energy Harvester. Journal of Microelectromechanical Systems. 2014; 24 (3):742-754.
Chicago/Turabian StylePattanaphong Janphuang; Robert A. Lockhart; Don Isarakorn; Simon Henein; Danick Briand; Nico F. De Rooij. 2014. "Harvesting Energy From a Rotating Gear Using an AFM-Like MEMS Piezoelectric Frequency Up-Converting Energy Harvester." Journal of Microelectromechanical Systems 24, no. 3: 742-754.
Recently, an integration of wireless sensor network with energy harvesters is getting more interested because it can extend the life time of battery in a sensor node, which is very important in many applications. This paper presents the concept of energy analysis in Zigbee based wireless sensor network, which is powered by a piezoelectric energy harvester to optimize the algorithms used in wireless sensor network. In this work, difference aspects related to piezoelectric energy harvester, characteristic of power consumption in Zigbee based wireless sensor node and concept of optimizing algorithms to balance input and output power in the integrated system are proposed. Keywords: energy harvesting, piezoelectric transducer, Zigbee based wireless sensor network
Don Isarakorn; Thapanun Sudhawiyangkul; Songmoung Nundrakwang. Energy Analysis in Zigbee Based Wireless Sensor Node Powered by Piezoelectric Energy Harvester. Advanced Materials Research 2014, 931-932, 1328 -1332.
AMA StyleDon Isarakorn, Thapanun Sudhawiyangkul, Songmoung Nundrakwang. Energy Analysis in Zigbee Based Wireless Sensor Node Powered by Piezoelectric Energy Harvester. Advanced Materials Research. 2014; 931-932 ():1328-1332.
Chicago/Turabian StyleDon Isarakorn; Thapanun Sudhawiyangkul; Songmoung Nundrakwang. 2014. "Energy Analysis in Zigbee Based Wireless Sensor Node Powered by Piezoelectric Energy Harvester." Advanced Materials Research 931-932, no. : 1328-1332.