An ultrasonic sensor for in-air applications has been fabricated using ferroelectric polymer technology. The proximity sensor, designed to be incorporated into a multiple sensing robotic gripper, consists of two unimodal transducers, a transmitter and a receiver, and is obtained by curving a strip of 40-µm-thick polyvinylidene fluoride. The transducers have a resonance frequency of 63.5 kHz, a quality factor Q approximately equal to 12 and a transverse piezoelectric coupling coefficient K31 of 0.29. The maximum detectable distance is 300 mm with an axial resolution of about 3 mm. Furthermore transducers resonating at 380 kHz, which operate at a maximum distance of 100 mm with a resolution of 2 mm, can be fabricated by using the same technique. Features and performance of both transmitter and receiver are discussed, together with the echo acquisition and the preprocessing electronic unit. © 1992 IEEE
Design and Characterization of a PVDF Ultrasonic Range Sensor
Fiorillo A. S.
1992-01-01
Abstract
An ultrasonic sensor for in-air applications has been fabricated using ferroelectric polymer technology. The proximity sensor, designed to be incorporated into a multiple sensing robotic gripper, consists of two unimodal transducers, a transmitter and a receiver, and is obtained by curving a strip of 40-µm-thick polyvinylidene fluoride. The transducers have a resonance frequency of 63.5 kHz, a quality factor Q approximately equal to 12 and a transverse piezoelectric coupling coefficient K31 of 0.29. The maximum detectable distance is 300 mm with an axial resolution of about 3 mm. Furthermore transducers resonating at 380 kHz, which operate at a maximum distance of 100 mm with a resolution of 2 mm, can be fabricated by using the same technique. Features and performance of both transmitter and receiver are discussed, together with the echo acquisition and the preprocessing electronic unit. © 1992 IEEEI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
