A new sound sensor system is proposed by the use of two delay devices with interdigital transducers operating at liquid-solid interface. One of two devices, immersed in water, has a delay time dependent upon the sound pressure level. The variation of the phase difference between two output signals of the delay devices, corresponding to a sound signal in water, is detected as an electrical signal via a phase ½omparating circuit.
A technique for measuring the sound velocity difference in two liquids which makes use of interdigital transducers is developed. There exists a linear relationship between the sound velocity difference in two liquids and the phase difference of two delayed output signals, which is converted to a dc voltage by using a phase comparation technique. A prototype with an 10.0 MHz input signal and three times reflections at the liquid cavity surface is fabricated and tested successfully.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.