选带细化超声流量计试验分析  

Application of ZOOM-FFT technology in Ultrasonic Flow Measurement

作　　者：伍昕[1] 刘岩[2] 何耀[1] 冯冠平[1] 

机构地区：[1]清华大学深圳研究院,广东深圳518057 [2]上海汽轮机有限公司,上海200240

出　　处：《仪表技术与传感器》2006年第6期17-18,62,共3页Instrument Technique and Sensor

基　　金：深圳市科技计划项目基金(2001-SO181)

摘　　要：文中研究一种用于工业密闭管道流体流量测量的新型超声波多普勒流量计。采用中频调制为基础提取流体流速的方向信息,引入选带细化频谱分析技术(ZOOM-FFT)对解调后的超声波多普勒信号进行频谱估计,并以此为基础计算管道流量。该方法能判断流速的方向;降低流速测量下限;提高了流速测量的动态响应速度、实时性以及稳定性。实验表明选通细化超声流量计准确度等级为1.5级。To study a new type ultrasonic Doppler flow meter for industry flow measurement of the liquid in the airtight pipeline. Based on the intermediate frequency modulation to extract the flow direction, and introduced the ZOOM-FFT technology to estimate the frequency spectrum of demodulated ultrasonic Doppler signal and calculated the flow based on this. This method can judge the flow direction, reducing the lower limit of the low flow velocity, raising the dynamic response speed, real-time character and stability of flow velocity measurement. Experiment indicated that this flow meter reached 1.5 precision grade.

关 键 词：超声波多普勒 流量测量 频谱分析 选带细化 中频解调 数字信号处理器 

分 类 号：TH814.92[机械工程—仪器科学与技术]