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This paper presents an effective signal processing scheme of hand gesture recognition with a superior accuracy rate of judging identical and dissimilar hand gestures. This scheme is implemented with the air sonar possessing a pair of cost-effective ultrasonic emitter and receiver along with signal processing circuitry. Through the circuitry, the Doppler signals of hand gestures are obtained and processed with the developed algorithm for recognition. Four different hand gestures of push motion, wrist motion from flexion to extension, pinch out, and hand rotation are investigated. To judge the starting time of hand gesture occurrence, the technique based on continuous short-period analysis is proposed. It could identify the starting time of the hand gesture with small-scale motion and avoid faulty judgment while no hand in front of the sonar. Fusing the short-time Fourier transform spectrogram of hand gesture to the image processing techniques of corner feature detection, feature descriptors, and Hamming-distance matching are the first-time, to our knowledge, employed to recognize hand gestures. The results show that the number of matching points is an effective parameter for classifying hand gestures. Based on the experimental data, the proposed scheme could achieve an accuracy rate of 99.8% for the hand gesture recognition.
Guo-Hua Feng; Gui-Rong Lai. Hand Gesture Detection and Recognition Using Spectrogram and Image Processing Technique with a Single Pair of Ultrasonic Transducers. Applied Sciences 2021, 11, 5407 .
AMA StyleGuo-Hua Feng, Gui-Rong Lai. Hand Gesture Detection and Recognition Using Spectrogram and Image Processing Technique with a Single Pair of Ultrasonic Transducers. Applied Sciences. 2021; 11 (12):5407.
Chicago/Turabian StyleGuo-Hua Feng; Gui-Rong Lai. 2021. "Hand Gesture Detection and Recognition Using Spectrogram and Image Processing Technique with a Single Pair of Ultrasonic Transducers." Applied Sciences 11, no. 12: 5407.
This study presents a state-of-the-art soft and biocompatible transducer capable of detecting vessel inner-wall pressure for biomedical applications. The device includes a 3D electroactive polymer core element encapsulated by polydimethylsiloxane with an ellipsoidal structure. The device produces a voltage output when its sensing mechanism experiences different pressures, resulting in deformation at different orientations. Thus, it can be employed to detect the pressure exerted by inner vessel walls of different stiffness values. The output voltage is induced by the strain experienced by the sensing mechanism of the device without the need for any external electrical power source. The core element, which is made of an ionic polymer-metal composite, possesses a unique hollow design; this allows a catheter to pass through, and the core element can be anchored at an arbitrary position on the catheter. We also demonstrate that the fabricated device can be integrated with a medically used percutaneous transluminal angioplasty balloon catheter to form a smart sensing module. This module can detect different levels of fat accumulation around the inner wall of a blood vessel phantom. Evaluating vessel blockage and stiffness using the signals acquired from the developed device is discussed.
Guo-Hua Feng; Liang-Chao Wang. Electroactive polymer-based inner vessel-wall pressure transducer capable of integration with a PTA balloon catheter for examining blood vessel health. Materials Science and Engineering: C 2020, 114, 111047 .
AMA StyleGuo-Hua Feng, Liang-Chao Wang. Electroactive polymer-based inner vessel-wall pressure transducer capable of integration with a PTA balloon catheter for examining blood vessel health. Materials Science and Engineering: C. 2020; 114 ():111047.
Chicago/Turabian StyleGuo-Hua Feng; Liang-Chao Wang. 2020. "Electroactive polymer-based inner vessel-wall pressure transducer capable of integration with a PTA balloon catheter for examining blood vessel health." Materials Science and Engineering: C 114, no. : 111047.
This paper presents a stretchable and flexible acoustic emission (AE) sensor composed of patterned upper, lower piezoelectric film foils, magnets and stereolithographic structures. The proposed device possesses the following novelties. The piezoelectric sensing structures with magnetic repulsion is effective for AE signal coupling. The lower piezoelectric serpentine-shaped AE detection structure with stretchable and flexible characteristics allows sensing various curved surfaces. Additionally, the contact force between the sensing target and AE sensor can be evaluated by monitoring the structural characteristic change of the upper piezoelectric structure of the AE sensor. The magnetic-repulsion-enhanced AE sensor exhibits a better bandwidth compared to that with only a lower AE sensing structure. Also, the fabricated sensor subjected to a sensing target force ranging from 4.98 to 14.85 mN resulting in a frequency change of the piezoelectric sensing beam of the upper foil from 20.073 to 20.135 kHz is verified. The developed AE sensor can open a new field for various applications. For instance, AE waves can be monitored without contacting the target (e.g., interfacing with air). The detection mechanism of AE waves by an action at a distance is successfully demonstrated.
Guo-Hua Feng; Cheng-Yen Chiang. Magnetic-repulsion-coupled piezoelectric-film-based stretchable and flexible acoustic emission sensor. Smart Materials and Structures 2020, 29, 035027 .
AMA StyleGuo-Hua Feng, Cheng-Yen Chiang. Magnetic-repulsion-coupled piezoelectric-film-based stretchable and flexible acoustic emission sensor. Smart Materials and Structures. 2020; 29 (3):035027.
Chicago/Turabian StyleGuo-Hua Feng; Cheng-Yen Chiang. 2020. "Magnetic-repulsion-coupled piezoelectric-film-based stretchable and flexible acoustic emission sensor." Smart Materials and Structures 29, no. 3: 035027.
This study proposes a novel piezoelectric micromachined ultrasonic transducer (PMUT), fabricated on a metal foil. Using a bottom-up, cost-effective micromachining technique, the PMUTs made of electrodes, a piezoelectric film, or electrode-sandwiched structures with versatile patterns were implemented on a large-area foil thinner rather than regular paper. The proposed microfabrication facilitated the PMUT to be able to generate ultrasonic waves with fundamental and harmonic resonances. The fourth-order resonances of the fabricated PMUT functionally operated at an ultrasonic spectrum of approximately 30 kHz as an ultrasonic emitter. The developed PMUT was paired with a microelectromechanical system (MEMS) microphone module for range-finding applications in the range of several tens of millimeters. A signal-processing scheme was developed to extract the representative pattern from the acquired signals that were emitted and received. The pattern enabled finding the distance between the PMUT and the microphone using time-of-flight and strength-variation technology. The developed PMUT-microphone pair demonstrated its range-finding performance, displaying an error of less than 0.7% using the time-of-flight method.
Guo-Hua Feng; Hua-Jin Liu. Piezoelectric Micromachined Ultrasonic Transducers with a Cost-Effective Bottom-Up Fabrication Scheme for Millimeter-Scale Range Finding. Sensors 2019, 19, 4696 .
AMA StyleGuo-Hua Feng, Hua-Jin Liu. Piezoelectric Micromachined Ultrasonic Transducers with a Cost-Effective Bottom-Up Fabrication Scheme for Millimeter-Scale Range Finding. Sensors. 2019; 19 (21):4696.
Chicago/Turabian StyleGuo-Hua Feng; Hua-Jin Liu. 2019. "Piezoelectric Micromachined Ultrasonic Transducers with a Cost-Effective Bottom-Up Fabrication Scheme for Millimeter-Scale Range Finding." Sensors 19, no. 21: 4696.
This paper presents a soft engine which performs up-and-down motion with four planar film-structured ionic polymer-metal composites (IPMC) actuators. This soft engine assembled with a stretchable Fresnel zone plate is capable of tuning the focus of ultrasonic beam. Instead of conventional clamps, we employ 3D printed frame pairs with magnets and a conductive gold cloth to provide an alternative solution for securing the IPMC actuators during assembly. The design and analysis of the zone plate are carefully performed. The zone plate allows the plane ultrasonic wave to be effectively focused. The motion of IPMC actuators stretch the metal-foil-made zone plate to tune the focal range of the ultrasonic beam. The zone plate, 3D frames and IPMC actuators were fabricated, assembled and tested. The stiffness normal to the stretchable zone plate with varied designs was investigated and the seven-zone design was selected for our experimental study. The force responsible for clamping the IPMC actuators, controlled by the magnetic attraction between the fabricated frames, was also examined. The driving voltage, current and resulting displacement of IPMC actuation were characterized. The developed soft engine stretching the zone plate to tune the focal point of the ultrasonic beam up to 10% was successfully demonstrated.
Guo-Hua Feng; Hong-Yu Liu. An Out-of-Plane Operated Soft Engine Driving Stretchable Zone Plate for Adjusting Focal Point of an Ultrasonic Beam. Sensors 2019, 19, 3819 .
AMA StyleGuo-Hua Feng, Hong-Yu Liu. An Out-of-Plane Operated Soft Engine Driving Stretchable Zone Plate for Adjusting Focal Point of an Ultrasonic Beam. Sensors. 2019; 19 (18):3819.
Chicago/Turabian StyleGuo-Hua Feng; Hong-Yu Liu. 2019. "An Out-of-Plane Operated Soft Engine Driving Stretchable Zone Plate for Adjusting Focal Point of an Ultrasonic Beam." Sensors 19, no. 18: 3819.
This paper presents a stretchable and flexible acoustic emission (AE) sensor composed of patterned double piezoelectric-film foils and magnets along with stereolithographic structures. The proposed device has following novelties. The piezoelectric sensing structures with magnetic repulsion for effectively AE signal coupling enhancement. The lower piezoelectric serpentine-shaped AE detection structure with stretchable and flexible characteristics allows sensing versatile curved surface. Additionally, the contact force between the sensing target and AE sensor can be evaluated via monitoring the structure characteristic change of the upper piezoelectric structure of the AE sensor. The developed AE sensor could open a new field for versatile applications.
Guo-Hua Feng; Cheng-Yen Chiang. Double Functional Piezoelectric Film Based Stretchable and Flexible Acoustic Emission Sensor with Unique Magnetic Repulsion Sensing Enhancement and Contact Force Self-Detectability. 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) 2019, 1973 -1976.
AMA StyleGuo-Hua Feng, Cheng-Yen Chiang. Double Functional Piezoelectric Film Based Stretchable and Flexible Acoustic Emission Sensor with Unique Magnetic Repulsion Sensing Enhancement and Contact Force Self-Detectability. 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). 2019; ():1973-1976.
Chicago/Turabian StyleGuo-Hua Feng; Cheng-Yen Chiang. 2019. "Double Functional Piezoelectric Film Based Stretchable and Flexible Acoustic Emission Sensor with Unique Magnetic Repulsion Sensing Enhancement and Contact Force Self-Detectability." 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) , no. : 1973-1976.
This paper presents a soft engine which performs the long-range up-and-down motion with four planar film-structured electroactive polymer (EAP) actuators. The engine can dynamically tune the focus of ultrasonic beam by driving the foil-made stretchable Fresnel zone plate with out-of-plane motion. Moreover, the micromachined buckles and serpentine structure were utilized to convert the bending motion of a pair of actuators to the linear motion along with lighting up the light-emitting diode (LED). We successfully demonstrate that the developed device stretches the zone plate to tune the focal point of the ultrasonic beam up to 4 mm. Also, controlling the LED to turn on and off in a moving cycle of the soft engine is displayed.
Guo-Hua Feng; Hong-Yu Liu. Out-of-Plane Long-Range Operated Soft Engine with Driving Stretchable Zone Plate and Led Abilities for Tunable Focused Therapeutic Ultrasonic and Infrared Heating Applications. 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) 2019, 72 -75.
AMA StyleGuo-Hua Feng, Hong-Yu Liu. Out-of-Plane Long-Range Operated Soft Engine with Driving Stretchable Zone Plate and Led Abilities for Tunable Focused Therapeutic Ultrasonic and Infrared Heating Applications. 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII). 2019; ():72-75.
Chicago/Turabian StyleGuo-Hua Feng; Hong-Yu Liu. 2019. "Out-of-Plane Long-Range Operated Soft Engine with Driving Stretchable Zone Plate and Led Abilities for Tunable Focused Therapeutic Ultrasonic and Infrared Heating Applications." 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) , no. : 72-75.
This paper presents a state-of-the-art piezoelectric micromachined ultrasonic transducer (PMUT) array fabricated on a $10\ \mu \mathrm{m}$ thick metal foil. Using a bottom-up micromachining technique, the PMUTs of electrode/piezoelectric film/ electrode sandwiched structures with versatile patterns can be implemented on a large-area foil with thickness even thinner than a hair. The proposed microfabrication easily allows the PMUT to generate ultrasonic waves with demanded resonances. The higher- order resonances of PMUT are functionally operated due to self-released residual stress fabrication. The developed PMUT array foil can be attached to the surface/substrate of arbitrary curvature. The integrated stereolithographic process can tune the operation frequencies of processed PMUTs. We successfully demonstrated the developed PMUT as a ranging transmitter and a Doppler radar to perform the hand gesture recognition.
Guo-Hua Feng; Hua-Jin Liu; Gui-Rong Lai. Piezoelectric Micromachined Ultrasonic Transducer with a Universal Bottom-Up Fabrication Approach Implemented on a Foil as Doppler Radar for Gesture Recognition. 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) 2019, 779 -782.
AMA StyleGuo-Hua Feng, Hua-Jin Liu, Gui-Rong Lai. Piezoelectric Micromachined Ultrasonic Transducer with a Universal Bottom-Up Fabrication Approach Implemented on a Foil as Doppler Radar for Gesture Recognition. 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS). 2019; ():779-782.
Chicago/Turabian StyleGuo-Hua Feng; Hua-Jin Liu; Gui-Rong Lai. 2019. "Piezoelectric Micromachined Ultrasonic Transducer with a Universal Bottom-Up Fabrication Approach Implemented on a Foil as Doppler Radar for Gesture Recognition." 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) , no. : 779-782.
This paper presents a flexible and stretchable electronic device with multi-functionality. This device contains a functional node array coated in smart materials and can be packaged with biocompatible polydimethylsiloxane (PDMS) films as a smart patch. Two kinds of smart materials are utilized: piezoelectric lead zirconate titanate (PZT) film for sensing acoustic emission (AE) waves and thermally activated poly(N-isopropylacrylamide) (PNIPAM) film for drug delivery. The functional node array is implemented on a thin flexible titanium sheet with an electrically connected serpentine network. This design has two advantages: (1) the serpentine network allows the node array to stretch in an arbitrary planar direction; (2) while the patch is stretched, the normal force exerted by the node can enhance the AE detection head’s coupling to the sensing object as well as increase the contact force and area of the PNIPAM film. The fabrication and experimental results of the designed serpentine-network AE-sensing structure, along with the temperature-controlled drug-release element, is described. The fabricated stretchable and flexible electronic device, assembled with a knee-band strap to examine the AE signals from the knee while executing hopping and jumping as well as walking motions, is also discussed.
Guo-Hua Feng; Wei-Ming Tseng. PZT and PNIPAM Film-Based Flexible and Stretchable Electronics for Knee Health Monitoring and Enhanced Drug Delivery. IEEE Sensors Journal 2018, 18, 9736 -9743.
AMA StyleGuo-Hua Feng, Wei-Ming Tseng. PZT and PNIPAM Film-Based Flexible and Stretchable Electronics for Knee Health Monitoring and Enhanced Drug Delivery. IEEE Sensors Journal. 2018; 18 (23):9736-9743.
Chicago/Turabian StyleGuo-Hua Feng; Wei-Ming Tseng. 2018. "PZT and PNIPAM Film-Based Flexible and Stretchable Electronics for Knee Health Monitoring and Enhanced Drug Delivery." IEEE Sensors Journal 18, no. 23: 9736-9743.
This paper presents a flexible and stretchable electronic device with multi-functionality. This device contains the functional node array coated smart materials and can be packaged with biocompatible polydimethylsiloxane (PDMS) films as a smart patch. Two kinds of smart materials are utilized: piezoelectric lead zirconate titanate (PZT) film for sensing acoustic emission (AE) wave and thermally activated Poly(N-isopropylacrylamide) PNIPAM film for delivering drug. The functional node array is implemented on a thin flexible titanium sheet with serpentine network electrically connected. This design has two advantages: (1) the serpentine network allows the node array to stretch in an arbitrary planar direction; (2) while the patch is stretched, the normal force exerted by the node can enhance the AE detection head coupling to the sensing object as well as increase the contact force/area of PNIPAM film. The fabrication and experimental results of the designed serpentine network AE sensing module along with the temperature controlled drug release element are reported. The demonstration of the smart patch assembled with a knee band strap for monitoring the knee joint motion is also described.
Guo-Hua Feng; Wei-Ming Tseng. Smart Material Constructed Flexible and Stretchable Electronics for Knee Joint Health Monitoring and Improved Drug Delivery. 2018 IEEE International Conference on Mechatronics and Automation (ICMA) 2018, 1350 -1355.
AMA StyleGuo-Hua Feng, Wei-Ming Tseng. Smart Material Constructed Flexible and Stretchable Electronics for Knee Joint Health Monitoring and Improved Drug Delivery. 2018 IEEE International Conference on Mechatronics and Automation (ICMA). 2018; ():1350-1355.
Chicago/Turabian StyleGuo-Hua Feng; Wei-Ming Tseng. 2018. "Smart Material Constructed Flexible and Stretchable Electronics for Knee Joint Health Monitoring and Improved Drug Delivery." 2018 IEEE International Conference on Mechatronics and Automation (ICMA) , no. : 1350-1355.
Guo-Hua Feng; Sheng-You Hou. Investigation of tactile bump array actuated with ionic polymer–metal composite cantilever beams for refreshable braille display application. Sensors and Actuators A: Physical 2018, 275, 137 -147.
AMA StyleGuo-Hua Feng, Sheng-You Hou. Investigation of tactile bump array actuated with ionic polymer–metal composite cantilever beams for refreshable braille display application. Sensors and Actuators A: Physical. 2018; 275 ():137-147.
Chicago/Turabian StyleGuo-Hua Feng; Sheng-You Hou. 2018. "Investigation of tactile bump array actuated with ionic polymer–metal composite cantilever beams for refreshable braille display application." Sensors and Actuators A: Physical 275, no. : 137-147.
This paper presents a study of lead zirconate titanate (PZT) films hydrothermally grown on a dome-shaped titanium diaphragm. Few articles in the literature address the implementation of hydrothermal PZT films on curved-diaphragm substrates for resonators. In this study, a 50-μm-thick titanium sheet is embossed using balls of designed dimensions to shape a dome-shaped cavity array. Through single-process hydrothermal synthesis, PZT films are grown on both sides of the processed titanium diaphragm with good adhesion and uniformity. The hydrothermal synthesis process involves a high concentration of potassium hydroxide solution and excess amounts of lead acetate and zirconium oxychloride octahydrate. Varied deposition times and temperatures of PZT films are investigated. The grown films are characterized by X-ray diffraction and scanning electron microscopy. The 10-μm-thick PZT dome-shaped resonators with 60- and 20-μm-thick supporting layers are implemented and further tested. Results for both resonators indicate that large electromechanical coupling coefficients and a series resonance of 95 MHz from 14 MHz can be attained. The device is connected to a complementary metal–oxide–semiconductor integrated circuit for analysis of oscillator applications. The oscillator reaches a Q value of 6300 in air. The resonator exhibits a better sensing stability when loaded with water when compared with air.
Guo-Hua Feng; Kuan-Yi Lee. Hydrothermally synthesized PZT film grown in highly concentrated KOH solution with large electromechanical coupling coefficient for resonator. Royal Society Open Science 2017, 4, 171363 .
AMA StyleGuo-Hua Feng, Kuan-Yi Lee. Hydrothermally synthesized PZT film grown in highly concentrated KOH solution with large electromechanical coupling coefficient for resonator. Royal Society Open Science. 2017; 4 (12):171363.
Chicago/Turabian StyleGuo-Hua Feng; Kuan-Yi Lee. 2017. "Hydrothermally synthesized PZT film grown in highly concentrated KOH solution with large electromechanical coupling coefficient for resonator." Royal Society Open Science 4, no. 12: 171363.
Guo-Hua Feng; Chia-Chun Wang. Examining the misalignment of a linear guideway pair on a feed drive system under different ball screw preload levels with a cost-effective MEMS vibration sensing system. Precision Engineering 2017, 50, 467 -481.
AMA StyleGuo-Hua Feng, Chia-Chun Wang. Examining the misalignment of a linear guideway pair on a feed drive system under different ball screw preload levels with a cost-effective MEMS vibration sensing system. Precision Engineering. 2017; 50 ():467-481.
Chicago/Turabian StyleGuo-Hua Feng; Chia-Chun Wang. 2017. "Examining the misalignment of a linear guideway pair on a feed drive system under different ball screw preload levels with a cost-effective MEMS vibration sensing system." Precision Engineering 50, no. : 467-481.
This paper presents an innovative piezoelectric thin-film based flow shear stress sensor fabricated by micromachining and stereolithography. The sensor has three novelties: Use hydrothermal method to simultaneously grow lead zirconate titanate (PZT) films on both sides of micromachined titanium cantilever beams. This results in an approximately zero stress gradient in the thickness direction of the sensing beam due to residue stress balance. Directly fabricate 3-dimensional high aspect ratio structure array on the micromachined planar structure by sterorelithograhy. This allows the measurands effectively to couple with the sensing beams. Using the unique 3D photopolymer structure array for sensing coupling, the detected flow direction and the shear stress caused by measured flow can be identified and evaluated. The detailed fabrication process and preliminary characterization results are described.
Guo-Hua Feng; Shao-Rong Ye; Ming-En Wei. Residual-stress-balanced piezoelectric film based direction sensitive flow shear-stress sensor for quadcopter navigation. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) 2017, 159 -162.
AMA StyleGuo-Hua Feng, Shao-Rong Ye, Ming-En Wei. Residual-stress-balanced piezoelectric film based direction sensitive flow shear-stress sensor for quadcopter navigation. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). 2017; ():159-162.
Chicago/Turabian StyleGuo-Hua Feng; Shao-Rong Ye; Ming-En Wei. 2017. "Residual-stress-balanced piezoelectric film based direction sensitive flow shear-stress sensor for quadcopter navigation." 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) , no. : 159-162.
This paper presents a multifunctional and stretchable smart patch. This patch contains the node array with coated piezoelectric lead zirconate titanate (PZT) film for sensing acoustic emission (AE) wave and thermally activated Poly(N-isopropylacrylamide) PNIPAM nodes for delivering drug. The PZT sensing node array is realized on a thin flexible titanium sheet with serpentine network electrically connected (Fig. 1). This design has two unique properties: (1) the serpentine network allows the node array to stretch in an arbitrary planar direction; (2) the normal force of AE detection head coupling to the sensing object can be enhanced while the patch stretched. The fabrication and testing of the designed serpentine network AE sensing module along with the temperature controlled drug release element are reported.
Guo-Hua Feng; Ming-Wei Tseng. Stretchable smart patch: Serpentine network connected functional node array with enhanced acoustic emission detectability and thermo-activated drug delivery functions. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) 2017, 339 -342.
AMA StyleGuo-Hua Feng, Ming-Wei Tseng. Stretchable smart patch: Serpentine network connected functional node array with enhanced acoustic emission detectability and thermo-activated drug delivery functions. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). 2017; ():339-342.
Chicago/Turabian StyleGuo-Hua Feng; Ming-Wei Tseng. 2017. "Stretchable smart patch: Serpentine network connected functional node array with enhanced acoustic emission detectability and thermo-activated drug delivery functions." 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) , no. : 339-342.
This paper presents a multisection bendable actuator with soft ring-buckle-type arm pair in each section (Fig. 1). The actuator is made of ionic polymer metal composite (IPMC) with our newly developed fabrication process, possessing better toughness and force output compared to conventional IPMC actuators. Novel flip lock connectors and parylene thin-film cable are developed and further integrated with the IPMC actuator to effectively provide squeezing pressure and electrical signals. A polyacrylamide hydrogel/parylene tube is created and assembled with the developed IPMC actuator as an active esophagus mimic for functional testing. The soft tube manipulated to generate a peristalsis-like movement for adjusting the bolus transport by electrical control of the IPMC arm pairs with different phase is demonstrated.
Guo-Hua Feng; Hao-Wei Hsu. Multisection bendable ring-buckle-type soft actuator with phase control ability for artificial esophagus applications. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) 2017, 918 -921.
AMA StyleGuo-Hua Feng, Hao-Wei Hsu. Multisection bendable ring-buckle-type soft actuator with phase control ability for artificial esophagus applications. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). 2017; ():918-921.
Chicago/Turabian StyleGuo-Hua Feng; Hao-Wei Hsu. 2017. "Multisection bendable ring-buckle-type soft actuator with phase control ability for artificial esophagus applications." 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) , no. : 918-921.
This paper presents a novel ellipsoid-shaped soft and biocompatible device which can be integrated with a percutaneous transluminal angioplasty (PTA) balloon catheter for biomedical application. The device contains a 3-dimentional electroactive polymer core element and is packaged by PDMS with villi structure around the center region of the device (Fig. 1). The core element is made of ionic polymer metal composite (IPMC) with a unique hollow design to allow the catheter passing through and can be anchored at an arbitrary position of the catheter. The core element possesses radial directional displacement and force sensing functions without using external electricity and can actuate the villi made on the PDMS housing of the device to generate forced perturbation. The ellipsoidal PDMS housing reduces flow resistance during operation and extends the device lifetime. The developed device detecting the fat accumulation around a blood vessel phantom is successfully demonstrated.
Guo-Hua Feng; Liang-Chao Wang; I-Hao Yeh. PTA balloon catheter integrated electroactive polymer transducer for sensing vascular blockage and disturbing vessel plaques. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) 2017, 39 -42.
AMA StyleGuo-Hua Feng, Liang-Chao Wang, I-Hao Yeh. PTA balloon catheter integrated electroactive polymer transducer for sensing vascular blockage and disturbing vessel plaques. 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). 2017; ():39-42.
Chicago/Turabian StyleGuo-Hua Feng; Liang-Chao Wang; I-Hao Yeh. 2017. "PTA balloon catheter integrated electroactive polymer transducer for sensing vascular blockage and disturbing vessel plaques." 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS) , no. : 39-42.
This paper presents a card-type acoustic emission wave (AE) sensor with symmetrically four-beam structures and thermal actuators providing normal enhanced forces to increase signal-to-noise ratio (SNR). The enhanced force applied to the sensing beam can be observable by thermal imager. The location of AE source can be detected by this developed single sensor, greatly improving the conventional method using multiple AE sensors and large installation area. Distinguishing the health and injured elbow joints is also demonstrated.
Guo-Hua Feng; Wei-Ming Chen. Acoustic emission wave sensor with thermally controllable force-enhancement mechanism for acoustic emission source detection and biomedical application. 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM) 2017, 213 -215.
AMA StyleGuo-Hua Feng, Wei-Ming Chen. Acoustic emission wave sensor with thermally controllable force-enhancement mechanism for acoustic emission source detection and biomedical application. 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM). 2017; ():213-215.
Chicago/Turabian StyleGuo-Hua Feng; Wei-Ming Chen. 2017. "Acoustic emission wave sensor with thermally controllable force-enhancement mechanism for acoustic emission source detection and biomedical application." 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM) , no. : 213-215.
This paper presents an electroactive polymer (EAP) actuator controlled scissor-type gripper (Fig. 1). The EAP actuator is made of ion polymer metal composite (IPMC). By doping Fe2O3 nanoparticles into IPMC, the actuator exhibits larger force output and 2-fold increase of maximum deformation compared to the pure IPMC actuator. Using water retaining poly(N-isopropylacrylamide) (PNIPAAM) made water supply mechanism results in a 10-fold increase of actuation capability. Using the gripper to manipulate the millimeter-sized fish roe is verified.
Guo-Hua Feng; Shih-Chieh Yen. Electroactive polymer actuated gripper enhanced with iron oxide nanoparticles and water supply mechanism for millimeter-sized fish roe manipulation. 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM) 2017, 216 -218.
AMA StyleGuo-Hua Feng, Shih-Chieh Yen. Electroactive polymer actuated gripper enhanced with iron oxide nanoparticles and water supply mechanism for millimeter-sized fish roe manipulation. 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM). 2017; ():216-218.
Chicago/Turabian StyleGuo-Hua Feng; Shih-Chieh Yen. 2017. "Electroactive polymer actuated gripper enhanced with iron oxide nanoparticles and water supply mechanism for millimeter-sized fish roe manipulation." 2017 IEEE Electron Devices Technology and Manufacturing Conference (EDTM) , no. : 216-218.
Guo-Hua Feng; Wei-Ming Chen. Piezoelectric-film-based acoustic emission sensor array with thermoactuator for monitoring knee joint conditions. Sensors and Actuators A: Physical 2016, 246, 180 -191.
AMA StyleGuo-Hua Feng, Wei-Ming Chen. Piezoelectric-film-based acoustic emission sensor array with thermoactuator for monitoring knee joint conditions. Sensors and Actuators A: Physical. 2016; 246 ():180-191.
Chicago/Turabian StyleGuo-Hua Feng; Wei-Ming Chen. 2016. "Piezoelectric-film-based acoustic emission sensor array with thermoactuator for monitoring knee joint conditions." Sensors and Actuators A: Physical 246, no. : 180-191.