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Gas detection apparatus based on SAW/GC was gained by combining Surface Acoustic Wave (SAW) gas sensor with gas chromatography (GC). Because of its features as high sensitivity, more detectable gas types and resolution of crossed-interference, the SAW/GC gas detection apparatus is perfect for the gas composition analysis in the complicated atmosphere background especially. In this paper, the main...
The GC-SAW system which can rapidly detect volatile organic compounds (VOCs) has been development. The detection limit depends on both response and the baseline noise of frequency in this system. The frequency baseline noise includes the Oscillator noise and temperature coefficient of frequency (TCF) noise. The TCF of the SAW sensor is hard to remove, so the optimization is base on both SAW oscillator...
This paper reports some work on SAW gas sensors based on the condensation-adsorption effect relating to the sensing position of the SAW detector in GC/SAW gas sensor system, and analyzes the response of GC / SAW gas sensor system influenced by the position of the SAW detector where the GC column outlet is aligned at. The SAW device aligned at different position is used in GC/SAW for the detection...
This paper presents some advances in polymer-coated surface acoustic wave (SAW) gas sensor research towards to organophosphorous compounds detection relating to the response mechanism analysis by using some new chemically interactive materials and deposition techniques, and SAW oscillator with superior frequency stability, which are illustrated and discussed in some detail. A 300MHz SAW based delay-line-oscillator...
This paper presents a configuration of a novel wireless surface acoustic wave (SAW) gyroscope. It consists of a two-port SAW resonator, and reflective delay line parallel to the resonator. A metallic dot array was positioned onto the anti-node location of the standing wave formed by the resonator, and was used as the proof masses. A secondary SAW is generated in the orthogonal direction, and interferes...
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