基于回波峰值的气体超声流量计频率跟踪方法  

Frequency Tracking Method of Ultrasonic Gas Flowmeter Based on Echo Peak Value

作　　者：徐铖 赵伟国 章圣意 潘旭东 XU Cheng;ZHAO Weiguo;ZHANG Shengyi;PAN Xudong(College of Metrological and Measurement Engineering,China Jiliang University,Hangzhou Zhejiang 310018,China;Zhejiang Key Laboratory of Flow Measurement Technology,Hangzhou Zhejiang 310018,China;Zhejiang Cangnan Instrument Group Co.,Ltd.,Cangnan Zhejiang 325800,China)

机构地区：[1]中国计量大学计量测试工程学院,浙江杭州310018 [2]浙江省流量计量技术研究重点实验室,浙江杭州310018 [3]浙江苍南仪表集团股份有限公司,浙江苍南325800

出　　处：《传感技术学报》2025年第3期451-457,共7页Chinese Journal of Sensors and Actuators

摘　　要：气体超声流量计由于工况环境复杂,致使超声换能器无法工作在最佳状态,造成其回波信号弱、衰减严重等问题,进而影响气体超声流量计整机性能。针对此问题,分析了超声换能器阻抗与谐振点的特性,提出了一种基于回波峰值的超声换能器频率跟踪方法。该方法在回波峰值与频率的关系基础上,采用频率特征点建立数学模型并计算最佳起始频率,然后根据模型的反正切函数作为步长改变因子进行频率跟踪,最终获得最佳激励频率。实验结果表明气体超声流量计的最佳频率跟踪准确且快速,可有效提高气体超声流量计在复杂工况下的计量性能。The complex working environment makes the ultrasonic transducer unable to work in the best state,resulting in weak echo signal and serious attenuation,and the performance of gas ultrasonic flowmeter will be affected.In order to solve this problem,the char-acteristics of impedance and resonance point of ultrasonic transducer are analyzed.A frequency tracking method of ultrasonic transducer based on echo peak value is proposed.According to the relationship between echo peak value and frequency,a mathematical model is established by using frequency characteristic points and the optimal initial frequency is calculated.Then the frequency is tracked by tak-ing the inverse tangent function of the model as the step change factor,and the optimal excitation frequency is finally obtained.The ex-perimental results show that the tracking of the optimal frequency is accurate and fast with the proposed gas ultrasonic flowmeter,and the performance of ultrasonic gas flowmet under complex working conditions is improved.

关 键 词：超声换能器 气体超声流量计 回波峰值 起始频率 变步长 

分 类 号：TH814[机械工程—仪器科学与技术]