✦ LIBER ✦

A versatile SAW-based sensor system for investigating gas-sensitive coatings

✍ Scribed by R.S. Falconer

Book ID: 103961205
Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 377 KB
Volume: 24
Category: Article
ISSN: 0925-4005
DOI: 10.1016/0925-4005(95)85011-2

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✦ Synopsis

Surface acoustic wave (SAW) technology is an extremely versatile technique for the development of gas sensors because of the SAW device's sensitivity to a wide variety of material properties that can change with gas concentration. In the present work, a SAW sensor oscillator is described, which allows both of the important SAW properties, velocity and attenuation, to be easily measured. The SAW sensor can be used with a variety of gas-sensing materials to monitor any gases that interact with the sensing materials. The versatility of the sensor is demonstrated by making SAW sensors using hvo gas-sensitive films that work in different ways. A tungsten trioxide (WO,) film with electrical properties that vary with hydrogen sulfide (H,S) exposure has been used to make a SAW H2S sensor, and an organic material that sorbs solvents has been used to demonstrate a SAW acetone sensor.

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