Comparison of simulations of ultrasonic fields of rectangular transducer

Abstract

Objective of this study was to compare the simulated ultrasonic fields of rectangular transducer obtained by two different techniques. The fields of elementary rectangular transducers were obtained by means of two different impulse response methods (FMIR and LWIR). Ultrasonic fields in a transmission mode excited by a Gauss shaped signal of 10MHz and 5 MHz transducers with different dimensions (length 5 mm, width – 2 mm, 1 mm and 0.7 mm) were simulated. In order to classify methods performance duration of calculations were measured. The performed simulations show that in a near field zone the results obtained by both methods match very well, but with the distance from the transducer the normalized root mean squared deviation increases, but never exceeds 10%. Calculations performed by the FMIR method are about 2.5 times faster compared to the LWIR method. In the FMIR method dynamic sampling in the time domain is used, this enables to keep non-increasing uncertainty versus the distance from a transducer plane contrarily to the LWIR method the uncertainty of which increases with a distance.