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Acoustic sensor for remote measuring of pressure

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Author(s): Karapetyan G. Ya. | Bagdasaryan A. S. | Kataev V. F. | Kataeva O. V.

Journal: Tekhnologiya i Konstruirovanie v Elektronnoi Apparature
ISSN 2225-5818

Issue: 2;
Start page: 31;
Date: 2008;
Original page

Keywords: surface acoustic waves | interdigital transducer | delay line | pressure sensors

ABSTRACT
The paper deals with sensors based on delay lines on surface acoustic waves (SAW), having a receiving-emitting and a reflective interdigital transducers (IDT). The dependence of the reflection coefficient of SAW on type and intensity of the load was studied. The authors propose a composite delay line in which the phase of the reflection coefficient depends on the pressure. Pressure leads to a shift of the reflective IDT relative to the transceiver, because they are located on different substrates. The paper also presents functional diagrams of the interrogator.
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