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M. Kobayashi
Kumamoto University Graduate School of Science and Technology, 2-39-1 Kurokami, Kumamoto, 860-8555, JAPAN

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Journal article
Published: 29 April 2020 in Japanese Journal of Applied Physics
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Corona discharge was produced in air atmosphere by applying positive and negative high voltage to a needle to investigate the poling effects for three kinds of sol-gel composite materials, Pb(Zr,Ti)O3(PZT)/PZT and Bi4Ti3O12(BiT)/PZT. Concerning piezoelectric constant dd33, only polarity was different. The samples poled by negative corona discharge showed superior temperature durability above certain temperatures even though no significant difference was observed regarding ultrasonic performance characteristics such as center frequency, 6dB frequency bandwidth. When the pulse voltage supplied by pulser/receiver increased, that difference starting temperature decreased and negative corona poling effect increased. Negative corona discharge poling was effective to improve thermal durability of sol-gel composite ultrasonic transducers when normal pulser/receiver with negative excitation pulse voltage was used for measurements.

ACS Style

Takumi Hara; Minori Furukawa; Shohei Nozawa; Kei Nakatsuma; Makiko Kobayashi. Polarity effect of corona discharge poling for sol-gel composite-based ultrasonic transducers. Japanese Journal of Applied Physics 2020, 59, SKKC10 .

AMA Style

Takumi Hara, Minori Furukawa, Shohei Nozawa, Kei Nakatsuma, Makiko Kobayashi. Polarity effect of corona discharge poling for sol-gel composite-based ultrasonic transducers. Japanese Journal of Applied Physics. 2020; 59 (SK):SKKC10.

Chicago/Turabian Style

Takumi Hara; Minori Furukawa; Shohei Nozawa; Kei Nakatsuma; Makiko Kobayashi. 2020. "Polarity effect of corona discharge poling for sol-gel composite-based ultrasonic transducers." Japanese Journal of Applied Physics 59, no. SK: SKKC10.

Journal article
Published: 21 December 2019 in Diagnostics
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We have newly developed coaxial and confocal optical-resolution photoacoustic microscopy based on sol-gel composite materials. This transducer contains a concave-shaped piezoelectric layer with a focus depth of 5 mm and a hole with a diameter of 3 mm at the center to pass a laser beam into a phantom. Therefore, this system can directly detect an excited photoacoustic signal without prisms or acoustic lenses. We demonstrate the capability of the system through pulse-echo and photoacoustic imaging experiments. The center frequency of the fabricated transducer is approximately 7 MHz, and its relative bandwidth is 86%. An ex-vivo experiment is conducted, and photoacoustic signals are clearly obtained. As a result, 2- and 3-dimensional maximum amplitude projection images are reconstructed.

ACS Style

Masayuki Tanabe; Tai Chieh Wu; Makiko Kobayashi; Che Hua Yang. Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy. Diagnostics 2019, 10, 6 .

AMA Style

Masayuki Tanabe, Tai Chieh Wu, Makiko Kobayashi, Che Hua Yang. Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy. Diagnostics. 2019; 10 (1):6.

Chicago/Turabian Style

Masayuki Tanabe; Tai Chieh Wu; Makiko Kobayashi; Che Hua Yang. 2019. "Fabrication of Coaxial and Confocal Transducer Based on Sol-Gel Composite Material for Optical Resolution Photoacoustic Microscopy." Diagnostics 10, no. 1: 6.

Conference paper
Published: 01 October 2018 in 2018 IEEE Sensors Applications Symposium (SAS)
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In this paper, we propose a novel method to form a robot skin sensor by a piezoelectric material spraying technique. By spraying piezoelectric material, the robot skin sensor can be fabricated on a robot with 3D free form. Our fabrication method is based on the sol-gel spraying technique and we improve it for fabricating a larger and more uniform piezoelectric film with reproducibility. We conducted experiments to evaluate the film fabrication quality and the prototype sensor's characteristics. According to the results, the film fabricated by the proposed method has enough thickness uniformity on 100 [mm] square plane. Additionally, the prototype sensor responses well to the applied force and its sensitivity is 25 [mV/N] with the bandwidth of 1 [kHz].

ACS Style

Sho Kimura; Kei Nakatsuma; Yasutaka Ohshima; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor. 2018 IEEE Sensors Applications Symposium (SAS) 2018, 1 -4.

AMA Style

Sho Kimura, Kei Nakatsuma, Yasutaka Ohshima, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor. 2018 IEEE Sensors Applications Symposium (SAS). 2018; ():1-4.

Chicago/Turabian Style

Sho Kimura; Kei Nakatsuma; Yasutaka Ohshima; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Fabrication and Evaluation of an Uniform Piezoelectric Film for a Robot Skin Sensor." 2018 IEEE Sensors Applications Symposium (SAS) , no. : 1-4.

Journal article
Published: 19 June 2018 in Japanese Journal of Applied Physics
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CaBi4Ti4O15 (CBiT)-based lead-free sol–gel composites were developed for high-temperature ultrasonic transducer application. In this study, two types of lead-free sol–gel solution, Ba0.7Sr0.3TiO3 (BST) and Bi4Ti3O12 (BiT), were used for consistency to fabricate ~50-µm-thick CBiT/BST and CBiT/BiT films on 3-mm-thick titanium substrates by a sol–gel spray technique. BST and BiT were chosen because of their high dielectric constant and high Curie temperature, respectively, in addition to their being lead-free materials. A thermal cycle test was carried out between RT and 600 °C, and clear multiple echoes were confirmed during three thermal cycles for both materials. In addition, the sensitivity of CBiT/BiT was higher than that of CBiT/BST although a higher poling temperature is required for CBiT/BiT. Therefore, an ultrasonic transducer potential for high-temperature application was successfully demonstrated.

ACS Style

Tomoya Yamamoto; Makiko Kobayashi. CaBi4Ti4O15-based lead-free sol–gel composites for high-temperature application. Japanese Journal of Applied Physics 2018, 57, 07LB16 .

AMA Style

Tomoya Yamamoto, Makiko Kobayashi. CaBi4Ti4O15-based lead-free sol–gel composites for high-temperature application. Japanese Journal of Applied Physics. 2018; 57 (7S1):07LB16.

Chicago/Turabian Style

Tomoya Yamamoto; Makiko Kobayashi. 2018. "CaBi4Ti4O15-based lead-free sol–gel composites for high-temperature application." Japanese Journal of Applied Physics 57, no. 7S1: 07LB16.

Conference paper
Published: 01 January 2018 in The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)
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In this paper, we propose a novel method to form a robot skin sensor by a piezoelectric material spraying technique. By spraying piezoelectric material and a pattern of electrodes, the robot skin is fabricated on a robot with 3D free form. We describe our method briefly, then report our piezoelectric film production method and a circuit was created to remove electrical noise, the frequency characteristics and the voltage sensitivity of the sensor fabricated on the plane were investigated. According to the results, we found that the sensor we proposed has performance that works well as tactile sensor.

ACS Style

Sho Kimura; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Output characteristics of piezoelectric sensor by a sol-gel spray technique. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, 2018, 1A1 -I17.

AMA Style

Sho Kimura, Kei Nakatsuma, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Output characteristics of piezoelectric sensor by a sol-gel spray technique. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec). 2018; 2018 ():1A1-I17.

Chicago/Turabian Style

Sho Kimura; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Output characteristics of piezoelectric sensor by a sol-gel spray technique." The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, no. : 1A1-I17.

Conference paper
Published: 01 January 2018 in The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)
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In the ultrasonic phased array, currently used, the size of the independent vibration element is fixed and the arrangement density is not free. The shape of the phased array is also restricted by the size of it. We have the concept of covering the whole substrate with spray coating of piezoelectric material and applying it to non-contact ultrasonic measurement and manipulation by setting it as an ultrasonic transmitting and receiving point anywhere on the surface of the base material. We aim to fabricate a sheet-like ultrasonic phased array on a large area or curved surface. In this paper, we describe the evaluation results of piezoelectric film coating on curved surface using sol-gel spray method with multi-axis drive apparatus.

ACS Style

Takashi Uchida; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. Piezoelectric film coating on free-form surface by multi-axis drive. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, 2018, 1P2 -K18.

AMA Style

Takashi Uchida, Kei Nakatsuma, Masayuki Tanabe, Makiko Kobayashi, Ippei Torigoe. Piezoelectric film coating on free-form surface by multi-axis drive. The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec). 2018; 2018 ():1P2-K18.

Chicago/Turabian Style

Takashi Uchida; Kei Nakatsuma; Masayuki Tanabe; Makiko Kobayashi; Ippei Torigoe. 2018. "Piezoelectric film coating on free-form surface by multi-axis drive." The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec) 2018, no. : 1P2-K18.

Journal article
Published: 27 November 2017 in Sensors
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Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of a CaBi4Ti4O15(CBT)/Pb(Zr,Ti)O3(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has a high Curie temperature. To verify the high temperature durability, CBT/PZT sol-gel composite films were fabricated on titanium substrates by spray coating, and the CBT/PZT samples were tested in a furnace at various temperatures. Reflected echoes with a high signal-to-noise ratio were observed up to 600 °C. A thermal cycle test was conducted from room temperature to 600 °C, and no significant deterioration was found after the second thermal cycle. To investigate the long-term high-temperature durability, a CBT/PZT ultrasonic transducer was tested in the furnace at 600 °C for 36 h. Ultrasonic responses were recorded every 3 h, and the sensitivity and signal-to-noise ratio were stable throughout the experiment.

ACS Style

Makiko Kobayashi; Taiga Kibe; Hajime Nagata. Mn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures. Sensors 2017, 17, 2740 .

AMA Style

Makiko Kobayashi, Taiga Kibe, Hajime Nagata. Mn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures. Sensors. 2017; 17 (12):2740.

Chicago/Turabian Style

Makiko Kobayashi; Taiga Kibe; Hajime Nagata. 2017. "Mn-Doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures." Sensors 17, no. 12: 2740.

Preprint
Published: 02 October 2017
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Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of CaBi4Ti4O15(CBT)/Pb(Zr,Ti)O3(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 C because no couplant is required and CBT has a high Curie temperature. To verify the high temperature durability, CBT/PZT sol-gel composite films were fabricated on titanium substrates by spray coating, and the CBT/PZT samples were tested in a furnace at various temperatures. Reflected echoes with a high signal-to-noise ratio were observed up to 600 C. A thermal cycle test was conducted from room temperature to 600 C, and no significant deterioration was found after the second thermal cycle. To investigate the long-term high-temperature durability, a CBT/PZT ultrasonic transducer was tested in the furnace at 600 °C for 36 h. Ultrasonic responses were recorded every 3 h, and the sensitivity and signal-to-noise ratio were stable throughout the experiment.

ACS Style

Makiko Kobayashi; Taiga Kibe; Hajime Nagata. Mn-doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures. 2017, 1 .

AMA Style

Makiko Kobayashi, Taiga Kibe, Hajime Nagata. Mn-doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures. . 2017; ():1.

Chicago/Turabian Style

Makiko Kobayashi; Taiga Kibe; Hajime Nagata. 2017. "Mn-doped CaBi4Ti4O15/Pb(Zr,Ti)O3 Ultrasonic Transducers for Continuous Monitoring at Elevated Temperatures." , no. : 1.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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Flexible ultrasonic transducers have been demanded growing for non-destructive testing (NDT). Pb(Zr, Ti)O3/Pb(Zr, Ti)O3(PZT/PZT) sol-gel composite ultrasonic transducers made by spray coating technique have flexibility. However, in this method, it required operator's experience and not suitable for mass production due to film quality individual difference. Therefore, automatic spray coating is desired for flexible ultrasonic transducer. In automatic spray coating method, spray coating process were performed by automatic spray coating machine, not human hand to fabricate uniform quality PZT/PZT films. In this study, PZT/PZT sol-gel composite thin films were fabricated onto thin stainless steel substrates in manual spray coating method and automatic spray coating method. After flexible ultrasonic transducer fabrication, ultrasonic measurements were carried out for aluminum substrate as flat surface and steel pipe as curved surface. As a result, ultrasonic transducer made by automatic spray coating method showed comparable with the one made by manual spray coating method. These results indicate steady potential of flexible ultrasonic transducer by automatic spray coating method.

ACS Style

Yuto Kiyota; Kei Nakatsuma; Makiko Kobayashi. Flexible ultrasonic transducers by automatic spray coating for non-destructive testing. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -4.

AMA Style

Yuto Kiyota, Kei Nakatsuma, Makiko Kobayashi. Flexible ultrasonic transducers by automatic spray coating for non-destructive testing. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-4.

Chicago/Turabian Style

Yuto Kiyota; Kei Nakatsuma; Makiko Kobayashi. 2017. "Flexible ultrasonic transducers by automatic spray coating for non-destructive testing." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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For new-generation thermal power plants, off-line non-destructive testing is not sufficient and long-term monitoring at high temperature is desired. In the previous study, ultrasonic transducers made by CaBi 4 Ti 4 O 15 (CBT)/Pb(Zr, Ti)O 3 (PZT) were investigated and maximum operation temperature was estimated as ~600°C. Since operation temperature of new-generation thermal power plant will be ~700°C, it is necessary to develop new sol-gel composite. Thus new sol-gel composite, CaBi 2 Ta 2 O 9 (CBTa)/PZT was developed. CBTa was chosen as ferroelectric powder phase material because Curie temperature is sufficiently high such as 923°C, which is higher than that of CBT. PZT was chosen as dielectric sol-gel phase because of high dielectric constant. CBTa/PZT films were fabricated on 3mm thick titanium substrates. One CBTa/PZT sample was placed in an electric furnace and ultrasonic measurement in pulse-echo mode was demonstrated between room temperature and 800°C. Sensitivity and signal-to-noise ratio (SNR) was high enough for thickness measurement even at 800°C. Signal amplitude and SNR were stable throughout the experiment.

ACS Style

Tomoya Yamamoto; Masaki Yugawa; Makiko Kobayashi; Hajime Nagata. High temrareture ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -4.

AMA Style

Tomoya Yamamoto, Masaki Yugawa, Makiko Kobayashi, Hajime Nagata. High temrareture ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-4.

Chicago/Turabian Style

Tomoya Yamamoto; Masaki Yugawa; Makiko Kobayashi; Hajime Nagata. 2017. "High temrareture ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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Off-line ultrasonic non-destructive testing (NDT) is used to inspect defects in thermal power plants. However, for new-generation thermal power plants, off-line NDT is not sufficient and long-term monitoring at high temperature is desired. In the previous study, ultrasonic transducers made by CaBi 4 Ti 4 O 15 (CBT)/Pb(Zr, Ti)O 3 (PZT) were investigated and maximum operation temperature was estimated as ~600°C. Since operation temperature of new-generation thermal power plant will be ~700°C, it is necessary to develop new sol-gel composite which has higher operation temperature than 700°C.

ACS Style

Tomoya Yamamoto; Masaki Yugawa; Hajime Nagata; Makiko Kobayashi. High temperature ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -1.

AMA Style

Tomoya Yamamoto, Masaki Yugawa, Hajime Nagata, Makiko Kobayashi. High temperature ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-1.

Chicago/Turabian Style

Tomoya Yamamoto; Masaki Yugawa; Hajime Nagata; Makiko Kobayashi. 2017. "High temperature ultrasonic transducers by CaBi2Ta2O9/Pb(Zr, Ti)O3 sol-gel composite." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-1.

Proceedings article
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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Development of flexible ultrasonic transducers for non-destructive testing (NDT) application has been desired since many infrastructures were consist of complex geometry. Sol-gel spray technique realized flexible ultrasonic transducers, however, it is difficult for manual spray coating to make quality assurance. In addition, manual spray coating is not suitable for mass production. Therefore, automatic spray coating method is desired for flexible ultrasonic transducer fabrication.

ACS Style

Yuto Kiyota; Kei Nakatsuma; Makiko Kobayashi. Flexible ultrasonic transducers by automatic spray coating for non-destructive testing. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -1.

AMA Style

Yuto Kiyota, Kei Nakatsuma, Makiko Kobayashi. Flexible ultrasonic transducers by automatic spray coating for non-destructive testing. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-1.

Chicago/Turabian Style

Yuto Kiyota; Kei Nakatsuma; Makiko Kobayashi. 2017. "Flexible ultrasonic transducers by automatic spray coating for non-destructive testing." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-1.

Conference paper
Published: 01 September 2017 in 2017 IEEE International Ultrasonics Symposium (IUS)
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Removed.

ACS Style

Hikaru Kouyama; Takao Namihira; Makiko Kobayashi. Notice of Removal: High temperature performance of PbTiO3/Pb(Zr, Ti)O3 thick films poled by pulse discharge at room temperature. 2017 IEEE International Ultrasonics Symposium (IUS) 2017, 1 -1.

AMA Style

Hikaru Kouyama, Takao Namihira, Makiko Kobayashi. Notice of Removal: High temperature performance of PbTiO3/Pb(Zr, Ti)O3 thick films poled by pulse discharge at room temperature. 2017 IEEE International Ultrasonics Symposium (IUS). 2017; ():1-1.

Chicago/Turabian Style

Hikaru Kouyama; Takao Namihira; Makiko Kobayashi. 2017. "Notice of Removal: High temperature performance of PbTiO3/Pb(Zr, Ti)O3 thick films poled by pulse discharge at room temperature." 2017 IEEE International Ultrasonics Symposium (IUS) , no. : 1-1.

Journal article
Published: 01 August 2017 in Sensors and Actuators A: Physical
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ACS Style

Yi-Lin Wu; Chin-Chi Cheng; Makiko Kobayashi; Che-Hua Yang. Novel design of extension nozzle and its application on real-time injection molding process diagnosed by ultrasound. Sensors and Actuators A: Physical 2017, 263, 430 -438.

AMA Style

Yi-Lin Wu, Chin-Chi Cheng, Makiko Kobayashi, Che-Hua Yang. Novel design of extension nozzle and its application on real-time injection molding process diagnosed by ultrasound. Sensors and Actuators A: Physical. 2017; 263 ():430-438.

Chicago/Turabian Style

Yi-Lin Wu; Chin-Chi Cheng; Makiko Kobayashi; Che-Hua Yang. 2017. "Novel design of extension nozzle and its application on real-time injection molding process diagnosed by ultrasound." Sensors and Actuators A: Physical 263, no. : 430-438.

Journal article
Published: 04 June 2017 in Sensors
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In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 °C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high temperature durability. By operating a pulsed laser in B-scan mode along with the integration of FUT and LUT, a multi-mode dispersion spectrum of a stainless steel pipe at high temperature can be measured. In addition, dynamic wave propagation behaviors are experimentally visualized with two dimensional scanning. The images directly interpret the reflections from the interior defects and also can locate their positions. This hybrid technique shows great potential for non-destructive evaluation of structures with complex geometry, especially in high temperature environments.

ACS Style

Tai Chieh Wu; Makiko Kobayashi; Masayuki Tanabe; Che Hua Yang. The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures. Sensors 2017, 17, 1285 .

AMA Style

Tai Chieh Wu, Makiko Kobayashi, Masayuki Tanabe, Che Hua Yang. The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures. Sensors. 2017; 17 (6):1285.

Chicago/Turabian Style

Tai Chieh Wu; Makiko Kobayashi; Masayuki Tanabe; Che Hua Yang. 2017. "The Use of Flexible Ultrasound Transducers for the Detection of Laser-Induced Guided Waves on Curved Surfaces at Elevated Temperatures." Sensors 17, no. 6: 1285.

Conference paper
Published: 01 January 2017 in Proceedings of Meetings on Acoustics
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We have developed a kerfless phased array transducer using sol-gel composite spraying technique. This technique is a method for developing piezoelectric transducer by spraying composite material of piezoelectric sol-gel solution and powder, and it has attracted great attention especially in non-destructive testing over the years because of its features such as curved surface suitability, flexibility, and high-temperature durability. The porosity can contribute to a decrease in crosstalk among elements. As a preliminary experiment, a kerfless linear array transducer with a center frequency of 5 MHz and pitch of 500e-6 m using the sol-gel composite spraying technique was fabricated and fundamental performance was evaluated. As a result, approximately -130 dB of crosstalk was obtained.

ACS Style

Masayuki Tanabe; Makiko Kobayashi; Kei Nakatsuma; Masahiko Nishimoto. Evaluation of kerfless phased array using sol-gel composite spraying technique. Proceedings of Meetings on Acoustics 2017, 32, 020012 .

AMA Style

Masayuki Tanabe, Makiko Kobayashi, Kei Nakatsuma, Masahiko Nishimoto. Evaluation of kerfless phased array using sol-gel composite spraying technique. Proceedings of Meetings on Acoustics. 2017; 32 (1):020012.

Chicago/Turabian Style

Masayuki Tanabe; Makiko Kobayashi; Kei Nakatsuma; Masahiko Nishimoto. 2017. "Evaluation of kerfless phased array using sol-gel composite spraying technique." Proceedings of Meetings on Acoustics 32, no. 1: 020012.

Conference paper
Published: 01 September 2016 in 2016 IEEE International Ultrasonics Symposium (IUS)
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Photoacoustic (PA) imaging employs a pulsed laser to generate acoustic waves to be detected with a piezoelectric transducer. A coaxial, or even confocal, optical-acoustic arrangement has been desired to achieve high resolution and high sensitivity PA imaging. This research reports several designs and fabrications of sol-gel based PZT/PZT single-element transducers for coaxial PA imaging. At first, a planar transducer is fabricated by a sol-gel spray method on a 0.5 mm thick stainless steel substrate with a hole of 3 mm in diameter. Using the planar transducer, in-vitro experiments is conducted, in which pulsed laser with a wavelength of 1053 nm and an energy of 1.15 mJ is used to generate the PA signal. Secondly, a focused transducer, which center frequency is approximately 5 MHz (-6dB bandwidth of 86 %), is fabricated on a stainless steel rod with a 3 mm diameter hole. Using the planar transducer, PA imaging experiments is conducted, in which pulsed fiber laser with a wavelength of 532 nm and a power of 0.235 W before focus lens is used. As results, PA signals are obtained with good SNR and two-dimensional PA image is reconstructed.

ACS Style

Masayuki Tanabe; Koki Hirata; Makiko Kobayashi; Masahiko Nishimoto; Tai-Chien Wu; Che-Hua Yang. A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging. 2016 IEEE International Ultrasonics Symposium (IUS) 2016, 1 -4.

AMA Style

Masayuki Tanabe, Koki Hirata, Makiko Kobayashi, Masahiko Nishimoto, Tai-Chien Wu, Che-Hua Yang. A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging. 2016 IEEE International Ultrasonics Symposium (IUS). 2016; ():1-4.

Chicago/Turabian Style

Masayuki Tanabe; Koki Hirata; Makiko Kobayashi; Masahiko Nishimoto; Tai-Chien Wu; Che-Hua Yang. 2016. "A sol-gel PZT/PZT transducer for coaxial photoacoustic imaging." 2016 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.

Conference paper
Published: 01 September 2016 in 2016 IEEE International Ultrasonics Symposium (IUS)
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Ultrasound non-destructive testing is mainly used because it can detect internal defects, however on-line monitoring for industrial plants is difficult due to high temperatures such as 600 °C. In previous study, CaBi 4 Ti 4 O 15 (CBT)/Pb(Zr,Ti)O 3 (PZT) sol-gel composites has been developed for NDT at 600 °C and it survived after 36 h at 600 °C, though sensitivity and signal to noise ratio (SNR) was very poor so that improvement of sensitivity and SNR is required. CBT/PZT sol-gel composite film was fabricated on a titanium substrate by spray coating. A platinum top electrode was fabricated on the film, and platinum wires were connected with a top electrode and titanium substrate for high temperature durability test. Every platinum wires were bonded to platinum top electrode and the titanium substrate by high temperature silver paste. Then the CBT/PZT transducer was tested in the furnace from room temperature to 600 °C. The thermal cycle was repeated three times. After that, CBT/PZT transducer was tested in the furnace at 600 °C for 36 h. As a result, the performance of the CBT/PZT sol-gel composite ultrasonic transducer showed superior thermal durability as compared with previous study. Therefore, CBT/PZT could be a good candidate as ultrasonic transducers for continuous monitoring at 600 °C.

ACS Style

Taiga Kibe; Keisuke Kimoto; Makiko Kobayashi; Hajime Nagata; Tadashi Takenaka. Continuous monitoring at 600 °C by CaBi4Ti4O15/Pb(Zr,Ti)O3 Sol-gel composite ultrasonic transducer. 2016 IEEE International Ultrasonics Symposium (IUS) 2016, 1 -4.

AMA Style

Taiga Kibe, Keisuke Kimoto, Makiko Kobayashi, Hajime Nagata, Tadashi Takenaka. Continuous monitoring at 600 °C by CaBi4Ti4O15/Pb(Zr,Ti)O3 Sol-gel composite ultrasonic transducer. 2016 IEEE International Ultrasonics Symposium (IUS). 2016; ():1-4.

Chicago/Turabian Style

Taiga Kibe; Keisuke Kimoto; Makiko Kobayashi; Hajime Nagata; Tadashi Takenaka. 2016. "Continuous monitoring at 600 °C by CaBi4Ti4O15/Pb(Zr,Ti)O3 Sol-gel composite ultrasonic transducer." 2016 IEEE International Ultrasonics Symposium (IUS) , no. : 1-4.

Journal article
Published: 16 June 2016 in Japanese Journal of Applied Physics
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The PbTiO3/Pb(Zr,Ti)O3 (PT/PZT) sol–gel composite is a promising piezoelectric material because of its high piezoelectricity and temperature stability up to 360 °C. However, the poling of PT/PZT required high temperature owing to the high coercive field of PT, which made the poling of PT/PZT troublesome. In this research, conventional DC corona poling and pulse discharge at room temperature were attempted for PT/PZT samples. As a result, PT/PZT poled by pulse discharge generation at room temperature showed comparable ultrasonic responses to that poled by DC corona discharge generation at a high temperature. Therefore, room-temperature poling of PT/PZT was successfully carried out by pulse discharge, and poling time was markedly reduced from ~15 min to 15 s.

ACS Style

Hikaru Kouyama; Taiga Kibe; Shota Fujimoto; Takao Namihira; Makiko Kobayashi. Room-temperature poling of PbTiO3/Pb(Zr,Ti)O3sol–gel composite films by pulse discharge. Japanese Journal of Applied Physics 2016, 55, 07KD12 .

AMA Style

Hikaru Kouyama, Taiga Kibe, Shota Fujimoto, Takao Namihira, Makiko Kobayashi. Room-temperature poling of PbTiO3/Pb(Zr,Ti)O3sol–gel composite films by pulse discharge. Japanese Journal of Applied Physics. 2016; 55 (7):07KD12.

Chicago/Turabian Style

Hikaru Kouyama; Taiga Kibe; Shota Fujimoto; Takao Namihira; Makiko Kobayashi. 2016. "Room-temperature poling of PbTiO3/Pb(Zr,Ti)O3sol–gel composite films by pulse discharge." Japanese Journal of Applied Physics 55, no. 7: 07KD12.

Journal article
Published: 02 June 2016 in Japanese Journal of Applied Physics
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Ultrasonic transducers prepared by a sol–gel composite method have been investigated in the field of nondestructive testing (NDT). Sol–gel composite materials could be ideal piezoelectric materials for ultrasonic transducer applications in the NDT field, and a new sol–gel composite with desirable characteristics has been developed. Three kinds of sol–gel composite materials composed of different dielectric constant sol–gel phases, Pb(Zr,Ti)O3 (PZT), Bi4Ti3O12 (BiT), and BaTiO3 (BT), and the same piezoelectric powder phase, PbTiO3 (PT), were fabricated and their properties were compared quantitatively. As a result, the PT/BT, sol–gel composite with the highest dielectric constant sol–gel phase showed the highest d 33 and signal strength. In addition, only PT/BT was successfully poled by room-temperature corona poling with reasonable signal strength.

ACS Style

Keisuke Kimoto; Makoto Matsumoto; Tsukasa Kaneko; Makiko Kobayashi. Sol–gel composite material characteristics caused by different dielectric constant sol–gel phases. Japanese Journal of Applied Physics 2016, 55, 07KB04 .

AMA Style

Keisuke Kimoto, Makoto Matsumoto, Tsukasa Kaneko, Makiko Kobayashi. Sol–gel composite material characteristics caused by different dielectric constant sol–gel phases. Japanese Journal of Applied Physics. 2016; 55 (7):07KB04.

Chicago/Turabian Style

Keisuke Kimoto; Makoto Matsumoto; Tsukasa Kaneko; Makiko Kobayashi. 2016. "Sol–gel composite material characteristics caused by different dielectric constant sol–gel phases." Japanese Journal of Applied Physics 55, no. 7: 07KB04.