北京航空航天大学学报 ›› 2017, Vol. 43 ›› Issue (11): 2216-2223.doi: 10.13700/j.bh.1001-5965.2017.0066

• 先进测量手段 • 上一篇    下一篇

基于Lamb波气体传感器的数据采集仪

黄鸯鸯, 王保良, 冀海峰, 黄志尧, 李海青   

  1. 浙江大学 控制科学与工程学院 工业控制技术国家重点实验室, 杭州 310027
  • 收稿日期:2017-02-15 修回日期:2017-07-21 出版日期:2017-11-20 发布日期:2017-09-18
  • 通讯作者: 王保良 E-mail:wangbl@zju.edu.cn
  • 作者简介:黄鸯鸯,女,硕士研究生。主要研究方向:检测技术与自动化装置;王保良,男,博士,教授,博士生导师。主要研究方向:过程参数检测、运动控制。
  • 基金资助:
    国家“863”计划(2015AA042603)

Data acquisition instrument based on Lamb wave gas sensor

HUANG Yangyang, WANG Baoliang, JI Haifeng, HUANG Zhiyao, LI Haiqing   

  1. State Key Laboratory of Industrial Control Technology, College of Control Science and Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2017-02-15 Revised:2017-07-21 Online:2017-11-20 Published:2017-09-18
  • Supported by:
    National High-tech Research and Development Program of China (2015AA042603)

摘要: Lamb波气体传感器因其具有高灵敏度、低损耗、多模式特性,在气体传感领域中展示出十分广阔的工业应用前景。然而,迄今为止,Lamb波气体传感器尚处于实验室基础研究阶段,其测试是基于网络分析仪,需人工读取测试结果并计算,不能实现自动获取被测参数,这在很大程度上限制了传感器的实际应用。针对现有测试技术的不足,研制了一种针对Lamb波气体传感器的数据采集仪。利用直接数字频率合成技术和嵌入式技术获取传感器的幅频特性和相频特性,通过多峰值快速搜索算法提取各个模式的最大峰值信息,并对传感器进行了各个模式下的扫频测试实验和算法验证实验。实验结果表明,采集仪能准确获得传感器的频率特性数据,并能实现一定频率范围内多个峰值信息的获取。再结合气体测量的相关模型,可直接输出参数测量结果,实现气体参数的自动检测。

关键词: Lamb波气体传感器, 直接数字频率合成, 幅相检测, 数据采集, 多峰值搜索

Abstract: 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.

Key words: Lamb wave gas sensor, direct digital synthesizer, amplitude-phase measuring, data acquisition, multi-peak search

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