Piezoelectric sensors based on the thin piezoelectric polyvinylidene fluoride (PVDF) polymer films are developed and fabricated to measure the interaction magnitude between the cavitating field and the material surface. In this thesis, PVDF sensors ware fabricated by photolithography processes. Kapton tape was tested to protect the sensors from the cavitation damage. The sensors developed within the thesis and commercial variants of the sensors were compared and analyzed. The drop ball calibration technique was used to set the sensitivity of the sensors to the impact forces. Four different ball-masses three and different drop heights were tested during the calibration. The relationship between the time duration of the signal generated by the sensors and the initial drop high in the calibration method was also analyzed. The different sizes and protective layer configurations of the PVDF sensor were prepared and tested. The developed PVDF sensor was successfully applied to the measurement of the acoustic cavitation field generated by ultrasonic horn proving higher sensitivity than commercial variant.
Anotace v angličtině
Piezoelectric sensors based on the thin piezoelectric polyvinylidene fluoride (PVDF) polymer films are developed and fabricated to measure the interaction magnitude between the cavitating field and the material surface. In this thesis, PVDF sensors ware fabricated by photolithography processes. Kapton tape was tested to protect the sensors from the cavitation damage. The sensors developed within the thesis and commercial variants of the sensors were compared and analyzed. The drop ball calibration technique was used to set the sensitivity of the sensors to the impact forces. Four different ball-masses three and different drop heights were tested during the calibration. The relationship between the time duration of the signal generated by the sensors and the initial drop high in the calibration method was also analyzed. The different sizes and protective layer configurations of the PVDF sensor were prepared and tested. The developed PVDF sensor was successfully applied to the measurement of the acoustic cavitation field generated by ultrasonic horn proving higher sensitivity than commercial variant.
Piezoelectric sensors based on the thin piezoelectric polyvinylidene fluoride (PVDF) polymer films are developed and fabricated to measure the interaction magnitude between the cavitating field and the material surface. In this thesis, PVDF sensors ware fabricated by photolithography processes. Kapton tape was tested to protect the sensors from the cavitation damage. The sensors developed within the thesis and commercial variants of the sensors were compared and analyzed. The drop ball calibration technique was used to set the sensitivity of the sensors to the impact forces. Four different ball-masses three and different drop heights were tested during the calibration. The relationship between the time duration of the signal generated by the sensors and the initial drop high in the calibration method was also analyzed. The different sizes and protective layer configurations of the PVDF sensor were prepared and tested. The developed PVDF sensor was successfully applied to the measurement of the acoustic cavitation field generated by ultrasonic horn proving higher sensitivity than commercial variant.
Anotace v angličtině
Piezoelectric sensors based on the thin piezoelectric polyvinylidene fluoride (PVDF) polymer films are developed and fabricated to measure the interaction magnitude between the cavitating field and the material surface. In this thesis, PVDF sensors ware fabricated by photolithography processes. Kapton tape was tested to protect the sensors from the cavitation damage. The sensors developed within the thesis and commercial variants of the sensors were compared and analyzed. The drop ball calibration technique was used to set the sensitivity of the sensors to the impact forces. Four different ball-masses three and different drop heights were tested during the calibration. The relationship between the time duration of the signal generated by the sensors and the initial drop high in the calibration method was also analyzed. The different sizes and protective layer configurations of the PVDF sensor were prepared and tested. The developed PVDF sensor was successfully applied to the measurement of the acoustic cavitation field generated by ultrasonic horn proving higher sensitivity than commercial variant.
A review of methods used for the production of piezoelectric sensors for the cavitation impact measurements with the special focus on thin film sensors
Fundamental properties of piezoelectric film sensors towards the cavitation impact measurement
The elaboration of a methodology for the production of piezoelectric sensors for the cavitation impact measurement
Design and production of piezoelectric film sensors of different sizes and configurations for the cavitation impact measurement
The tensing of an appropriate cover for the sensor protection
The calibration of the sensors using an appropriate method
The application of sensors for the measurement of the acoustic cavitation
Zásady pro vypracování
A review of methods used for the production of piezoelectric sensors for the cavitation impact measurements with the special focus on thin film sensors
Fundamental properties of piezoelectric film sensors towards the cavitation impact measurement
The elaboration of a methodology for the production of piezoelectric sensors for the cavitation impact measurement
Design and production of piezoelectric film sensors of different sizes and configurations for the cavitation impact measurement
The tensing of an appropriate cover for the sensor protection
The calibration of the sensors using an appropriate method
The application of sensors for the measurement of the acoustic cavitation
Seznam doporučené literatury
KIM, Ki-Han, Georges CHAHINE, Jean-Pierre FRANC a Ayat KARIMI. Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht: Springer, [2014]. Fluid mechanics and its applications, v. 106.
FRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328.
BRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, c2014. ISBN 978-1-107-64476-2.
SOYAMA, Hitoshi, MOMMA Takahiro, LICHTAROWICZ Andrzej and Edward WILLIAMS. A New Calibration Method for Dynamically Loaded Transducers and Its Application to Cavitation Impact Measurement. Journal of Fluids Engineering. 1998, 120(4). 10.1115/1.2820728.
CONG, Jiqing, Jianping JING, Changmin CHEN a Zezeng DAI. Development of a PVDF Sensor Array for Measurement of the Dynamic Pressure Field of the Blade Tip in an Axial Flow Compressor. Sensors (Basel, Switzerland). 2019Mar, 19(6): 1404. DOI: 10.3390/s19061404.
Seznam doporučené literatury
KIM, Ki-Han, Georges CHAHINE, Jean-Pierre FRANC a Ayat KARIMI. Advanced experimental and numerical techniques for cavitation erosion prediction. Dordrecht: Springer, [2014]. Fluid mechanics and its applications, v. 106.
FRANC, Jean-Pierre a Jean-Marie MICHEL. Fundamentals of cavitation. Boston: Kluwer Academic Publishers, c2004. ISBN 1402022328.
BRENNEN, Christopher E. Cavitation and bubble dynamics. New York: Cambridge University Press, c2014. ISBN 978-1-107-64476-2.
SOYAMA, Hitoshi, MOMMA Takahiro, LICHTAROWICZ Andrzej and Edward WILLIAMS. A New Calibration Method for Dynamically Loaded Transducers and Its Application to Cavitation Impact Measurement. Journal of Fluids Engineering. 1998, 120(4). 10.1115/1.2820728.
CONG, Jiqing, Jianping JING, Changmin CHEN a Zezeng DAI. Development of a PVDF Sensor Array for Measurement of the Dynamic Pressure Field of the Blade Tip in an Axial Flow Compressor. Sensors (Basel, Switzerland). 2019Mar, 19(6): 1404. DOI: 10.3390/s19061404.
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