US EPA

6607416 

Journal Article 

New prospects for acoustic sensors: an overview 

White, RM 

1987 

Proceedings of the Annual IEEE International Frequency Control Symposium 

333-338 

English 

10.1109/freq.1987.201042 

INSPEC:3096986 

https://www.scopus.com/inward/record.uri?eid=2-s2.0-0023596542&doi=10.1109%2ffreq.1987.201042&partnerID=40&md5=3f572938187fb22a99de926ad0b7b6df
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Sensors using elastic waves have been devised for detecting a wide range of nonacoustical measurands. Examples include: biological substances (antigens in a liquid); chemicals, such as styrene vapor and hydrogen sulfide; electrical and magnetic fields; temperature; and mechanical measurands, such as positron, force and pressure, acceleration, and material properties such as viscosity. Low cost and simplicity characterize several acoustical position-sensing systems for use with robots and computer displays. In many of these applications, the output variable is a frequency, which is a convenient input variable for digital storage and processing circuitry. Device principles, operating characteristics, and possible limitations of a number of these acoustic sensors are described.