一种低功耗自诊断双阈值超声波传播时间检测法  

Low Power Self-diagnosis Dual-threshold Method for Detecting Ultrasound Propagation Time

作　　者：毛凯[1] 胡亮[1] 付新[1] MAO Kai;HU Liang;FU Xin(Zhejiang University,State Key Laboratory of Fluid Power&Mechatronic Systems,Hangzhou 310027,China)

机构地区：[1]浙江大学,流体动力与机电系统国家重点实验室,浙江杭州310027

出　　处：《仪表技术与传感器》2021年第3期82-92,共11页Instrument Technique and Sensor

基　　金：国家自然科学基金资助项目(51575476);国家自然科学创新团队基金资助项目(51821093);国际合作项目(2014DFR71220)。

摘　　要：针对低功耗阈值检测法时差法超声波流量计出现的跳波问题,提出了一种低功耗自诊断双阈值超声波传播时间检测法。采用低功耗RS触发器、单稳态触发器、延时芯片和逻辑芯片把双阈值产生的脉冲信号转化成计时脉冲和诊断窗口,用于诊断跳波和筛选计时数据。实验结果表明,该方法能有效解决跳波,提高测量可靠性。Aiming at the cycle-skip problem in the transit-time ultrasonic flowmeter with low power consumption threshold detection method,a low-power self-diagnosis dual-threshold ultrasonic propagation time detection method was proposed.Low power RS flip-flops,monostable flip-flops,delay chips and logic chips were used to convert the pulse signal generated by double threshold into timing pulses and diagnosis windows,which were used to diagnose cycle-skip and screen timing data.Experimental result demonstrates that the method can effectively solve the cycle-skip problem and improve the measurement reliability.

关 键 词：时差法超声波流量计 自诊断 双阈值 跳波 

分 类 号：TH814[机械工程—仪器科学与技术]