基于Laguerre滤波的超声波流量计降噪方法研究  

Denoising study for ultrasonic gas flow measurements based on Laguerre filter

作　　者：刘丽珺[1] 鲍敏[1] 沈卫平[1] 

机构地区：[1]浙江理工大学机械与自动控制学院,浙江杭州310018

出　　处：《机电工程》2009年第9期54-56,共3页Journal of Mechanical & Electrical Engineering

基　　金：浙江理工大学科研启动基金资助项目(未提供)

摘　　要：针对气体超声波流量计利用过零检测定位波形脉冲时的干扰因素,以及计算系统对数据处理实时性的要求,对基于Laguerre滤波的递归最小二乘(RLS)降噪算法进行了研究,实现了在处理速度与稳定性上的折中。为信号后处理提供了理想的波形,避免了波形失真导致脉冲漏检、零位判断错误等误差因素的产生,给出了实时性强、波形定位准确、系统稳定性和抗干扰性能良好的气体超声流量计信号处理算法。研究结果表明,基于此算法的气体超声波流量计经检验具备2级精度。Aiming at the interfering factors that exist at zero-cross point and the real time of data processing in gas ultrasonic flowmeter, a Laguerre filter based recursive least squares （RLS） adaptive technique was studied to achieve a compromise between processing speed and stability of the system. The ideal waveform for the follow processing was provided, the waveform distortion resuiting in missed pulses, wrong tracking of zero-cross point and other error factors were avoided. The signal processing algorithm was applied to get good anti-interference performance, reconstruct a normalized and high signal to noise ratio（SNR） echo wave, and improve stability of system. The research results show that precision of this gas ultrasonic flowmeter achieves 2%.

关 键 词：气体超声波流量计 过零检测 Laguerre滤波 递归最小二乘 

分 类 号：TB126[理学—工程力学]