Title :
Noise analysis in air-coupled PVDF ultrasonic sensors
Author :
Fiorillo, Antonino S.
Author_Institution :
Dept. of Inf. Eng., Univ. of Sannio, Benevento, Italy
Abstract :
In this paper we analyze the noise generated in a piezo-polymer based sensor for low frequency ultrasound in air. The sensor includes two curved PVDF transducers for medium and short range applications. A lumped RLC equivalent circuit was derived from the measurement of the transducer´s electrical admittance, in air, by taking into account both mechanical and dielectric losses, which we suppose are the major sources of noise in similar devices. The electrical model was used to study and optimize the noise performance of a 61 kHz transducer and to simulate the electrical behavior of the complete transmitter-receiver system. The validity of the overall electrical model with low noise was confirmed after verifying, with Pspice, agreement of the practical and theoretical results.
Keywords :
acoustic noise; dielectric losses; electric admittance; equivalent circuits; losses; lumped parameter networks; piezoelectric thin films; piezoelectric transducers; polymer films; ultrasonic transducers; Pspice; air-coupled PVDF ultrasonic sensors; curved PVDF transducers; dielectric losses; electrical admittance; electrical model; low frequency ultrasound; lumped RLC equivalent circuit; mechanical losses; medium range applications; noise analysis; noise performance; piezo-polymer based sensor; short range applications; transducer; transmitter-receiver system; Admittance measurement; Circuit noise; Dielectric loss measurement; Equivalent circuits; Frequency; Low-frequency noise; Mechanical sensors; Noise generators; Ultrasonic imaging; Ultrasonic transducers;
Journal_Title :
Ultrasonics, Ferroelectrics, and Frequency Control, IEEE Transactions on
