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Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China





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Abstract A theoretical model is established to describe the response mechanism of surface acoustic wave SAW gas sensors based on physical adsorption on the detector surface. Wohljent’s method is utilized to describe the relationship of sensor output frequency shift of SAW oscillator and the mass loaded on the detector surface. The Brunauer-Emmett-Teller BET formula and its improved form are introduced to depict the adsorption behavior of gas on the detector surface. By combining the two methods, we obtain a theoretical model for the response mechanism of SAW gas sensors. By using a commercial SAW gas chromatography GC analyzer, an experiment is performed to measure the frequency shifts caused by different concentration of dimethyl methylphosphonate DMMP. The parameters in the model are given by fitting the experimental results and the theoretical curve agrees well with the experimental data. View Full-Text

Keywords: surface acoustic wave SAW; gas sensor; physical adsorption surface acoustic wave SAW; gas sensor; physical adsorption





Autor: Jiansheng Liu * and Yanyan Lu

Fuente: http://mdpi.com/



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