基于超声波振动传递的全量程氢气浓度检测方法  

Full range hydrogen concentration detection method based on ultrasonic vibration transmission

作　　者：孙慧[1] 孙凯[2] 施云波[1] 丁欣[1] 丁喜波[1] SUN Hui;SUN Kai;SHI Yunbo;DING Xin;DING Xibo(Heilongjiang Province Higher Educational Key Laboratory for Measuring&Control Technology and Instrumentation,Harbin University of Science and Technology,Harbin 150080,China;Department of Computer and Information Engineering,Heihe University,Heihe 164300,China)

机构地区：[1]哈尔滨理工大学测控技术与仪器黑龙江省高等教育重点实验室,哈尔滨150080 [2]黑河学院计算机与信息工程系,黑龙江黑河164300

出　　处：《振动与冲击》2022年第15期77-82,共6页Journal of Vibration and Shock

基　　金：国家基金基础科学研究项目(JCKY2017412C003)。

摘　　要：利用超声波振动传递相位差检测技术可在恶劣环境下实现高准确性、低成本氢气浓度检测。当氢气浓度变化较大时被测相位差会出现跨越多周期现象,传统超声波相位检测技术只能检测出单周期2π内相位变化,针对此问题提出一种运用多频超声波相位差检测技术实现氢气浓度检测的方法,加载多频信号获得低频包络信号相位差,结合高频信号单周期相位差求得跨周期总相位差,解决了超声波相位差大于2π后出现相位差跨周期无法检测的问题,实现了基于超声波振动传递的从低浓度到高浓度直至全量程氢气浓度检测。所述方法实现了低功耗,高精度气体浓度检测,经试验证明,该方法实现了氢气在4%浓度以下测量相对误差小于2.1%,90%浓度测量相对误差小于8%。Using ultrasonic vibration transmitting phase difference detection technology can realize high accuracy and low-cost hydrogen concentration detection in harsh environment.When hydrogen concentration changes more largely,the measured phase difference can have crossing multi-period phenomenon,while the traditional ultrasonic phase detection technology can only detect phase variation within 2π of a single cycle.Here,to solve this problem,a hydrogen concentration detection method using multi-frequency ultrasonic phase difference detection technology was proposed.By loading multi-frequency signal to obtain phase difference of low-frequency envelope signal,and combining with single period phase difference of high-frequency signal,the cross-period total phase difference was obtained.The proposed method could solve the problem of cross-period phase difference being unable to be detected after ultrasonic phase difference being larger than 2π to realize detection of hydrogen concentration from low concentration to high one until full range based on ultrasonic vibration transmission.It was shown that the proposed method can realize low power-consumption and high-precision gas concentration detection.Tests showed that the measurement relative error for hydrogen concentration of less than 4%is less than 2.1%,and that for hydrogen concentration of 90%is less than 8%.

关 键 词：相位差测量 氢气浓度测量 超声波振动 跨周期检测 

分 类 号：TH213.9[机械工程—机械制造及自动化]