| Citation: | HUANG Yangyang, WANG Baoliang, JI Haifeng, et al. Data acquisition instrument based on Lamb wave gas sensor[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(11): 2216-2223. doi: 10.13700/j.bh.1001-5965.2017.0066(in Chinese)
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Lamb wave gas sensor has broad industrial application prospects in gas sensing due to its advantages of high sensitivity, low loss and multi-mode characteristic. However, Lamb wave gas sensor is now still in fundamental academic research period. Experiments concerning the sensor are implemented by network analyzers, which means that gas properties cannot be determined automatically but by manual operation. This limits the applications of Lamb wave gas sensor. In this paper, a specified data acquisition instrument designed for Lamb wave gas sensor was developed. The direct digital synthesizer technology and an embedded system were introduced to obtain the information of the amplitude-frequency and phase-frequency of Lamb wave gas sensor. Maximum peaks of all Lamb wave modes were determined by a multi-peak fast search algorithm. To verify the effectiveness of the data acquisition instrument, frequency sweep experiment and algorithm verification experiment were carried out under different modes. The experimental results show that the data acquisition instrument can accurately acquire the frequency characteristics of Lamb wave gas sensor and the information of multiple peaks in a certain frequency range. Then, combining with the models of Lamb wave gas sensing, it can directly output parameter measurement results, and achieve automatic detection of gas parameters.
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