Abstract
Accurately measurement and monitor on methane gas concentration is an urgent issue to be solved in the purpose of safety and process control in homes, industries and mines. A new room temperature supra-molecular cryptophane A (CrypA)-coated Love wave based sensor incorporating a waveguide structure of SiO 2 /36° YX LiTaO 3 was presented in this contribution for sensing methane (CH 4 ), which exhibits some excellent advantages as simplicity, fast response, small size, higher sensitivity and working at room temperature. The developed Love wave methane gas sensor was composed of a differential Love wave delay line-oscillators with operation frequency of 160MHz, a supra-molecular CrypA coated along the acoustic propagation path of sensing device, and a frequency signal acquisition module (FSAM). Optimal guiding layer thickness was determined theoretically. Significant improvement in the mass sensitivity was achieved owing to the waveguide effect. Larger frequency response of around 3kHz and excellent repeatability were observed in gas experiment for sensing 5% CH 4 by using the developed Love wave sensor.
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