Piezoelectric film sensors for the cavitation impact measurement

Menghuot Phan

Diplomová práce

Abstract:

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.

Abstract:

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.

Keywords

cavitation, collapse, PVDF sensor, photolithography

Jazyk práce: angličtina

Datum vytvoření / odevzdání či podání práce: 12. 6. 2020

Obhajoba závěrečné práce

• Vedoucí: Ing. Miloš Müller, Ph.D.

Technická univerzita v Liberci

Fakulta strojní

Magisterský studijní program / obor:
Mechanical Engineering / Machines and Equipment Design