Spectral response analysis of PVDF capacitive sensors

7th Sensors & their Applications

Reyes-Ramírez, B.^1 ; García-Segundo, C.^1 ; García-Valenzuela, A.^1

Centro de Ciencias Aplicadas y Desarrollo Tecnológico, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, Apartado Postal70-186, Distrito Federal 04510, México, Mexico^1

关键词: Analytic expressions;    Electrical transduction;    Piezoelectric film;    Spectral response;    Test signal;    Theoretical modeling;    Ultrasonic signals;    Ultrasound waves;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/450/1/012032/pdf
DOI  :  10.1088/1742-6596/450/1/012032

来源: IOP

【 摘 要 】

We investigate the spectral response to ultrasound waves in water of low-noise capacitive sensors based on PVDF polymer piezoelectric films. First, we analyze theoretically the mechanical-to-electrical transduction as a function of the frequency of ultrasonic signals and derive an analytic expression of the sensor's transfer function. Then we present experimental results of the frequency response of a home-made PDVF in water to test signals from 1 to 20 MHz induced by a commercial hydrophone powered by a signal generator and compare with our theoretical model.