基于频谱分析信号处理的涡街流量计设计  

Based on the analysis of spectrum signal processing vortex flowmeter design

作　　者：贺中华[1,2] 谢云山[1,2] 魏文雄[1,2] 刘春雷[1,2] 李建平[3] 

机构地区：[1]重庆工业自动化仪表研究所,重庆401121 [2]重庆市流量仪表工程技术研究中心,重庆401121 [3]重庆大学,重庆400044

出　　处：《自动化与仪器仪表》2011年第6期52-53,57,共3页Automation & Instrumentation

基　　金：重庆市科委科技计划项目资助(CSTC;2010CB2003)

摘　　要：给出了一种基于频谱分析信号处理的涡街流量计的设计,分析了采用频谱分析信号处理与带通滤波相结合的去噪方法。硬件上分析了核心控制器件MSP430F5438、压电传感器信号的放大与低通滤波、多通道的可选带通滤波器、程控放大及峰值检测模块、信号的整形输入,软件上分析了频率估算、FFT算法实现、峰值检测与放大、带通选择、频率计数,最后,在气体标准装置上进行了检定验证。结果表明,该流量计采用频谱分析信号处理和带通滤波,大大提高了液体流量测量的精度和抗干扰性。In this paper,a vortex flowmeters is designed based on spectrum analysis signal processing,the method to remove various types of noises using spectrum analysis combined with bandpass filter is analyzed.The core control device MSP430F5438,the amplification and low-pass filter of piezoelectric sensor signal,an optional multi-channel bandpass filter,programmable amplification and peak detection module,the signal shaping input module of hardware are analyzed;The frequency estimate,flow chart of FFT algorithm,peak detection and amplification,band-pass selection,frequency count of the software are analyzed.Finally,this vortex flowmeter has been tested on the gas standard equipment.The results show that the vortex flowmeters greatly improve the accuracy of liquid flow measurement and capability of anti-jamming using spectrum analysis signal processing.

关 键 词：涡街流量计 频谱分析 FFT 

分 类 号：TN802[电子电信—信息与通信工程]