基于DSP的低成本涡街流量计信号处理系统  

DSP-based low cost signal processing system for vortex flowmeter

作　　者：王肖芬[1] 徐科军[1] 陈智渊[1] 

机构地区：[1]合肥工业大学自动化研究所,合肥230009

出　　处：《仪器仪表学报》2006年第11期1427-1432,共6页Chinese Journal of Scientific Instrument

基　　金：合肥市重点科研计划资助项目。

摘　　要：涡街流量计易受噪声影响,现场测量精度得不到保证,量程比受限。本文选用片上资源丰富的TMS320LF2407A DSP芯片作为处理器,研制相应的数字信号处理系统。系统选用数字滤波加频谱分析的信号处理方法处理传感器信号,提高仪表抑制噪声的能力,扩展量程比；模拟信号调理部分加入限幅滤波电路,解决传感器信号强度变化大、需要调整硬件电路参数的问题。该系统体积小、成本低、功能齐全,并可与不同口径的一次仪表匹配。目前该系统已通过实验标定,并应用于工业现场。Vortex flowmeters are subjected to the influence of noise, so their measurement accuracy can not be ensured in industrial fields and the turn-down ratio is limited. A digital signal processing system of vorrex flowmeter was developed using TMS320LF2407A that has abundant peripherals on chip. Periodogram analysis and digital filtering techniques are used to process the sensor signal, hence the noise-rejecting ability is improved and the turn-down ratio is increased. An amplitude-limited filter was designed in the analog circuit, which eliminates the need of adjusting hardware circuit parameters for large amplitude variation of the sensor signal. The proposed system features small size, low cost, has all the required functions, and matches all primary instruments of vortex flowmeter with various diameters. The system was verified by calibration experiments, and has been applied to industry fields.

关 键 词：涡街流量计 频谱分析 数字滤波 DSP 

分 类 号：TP23[自动化与计算机技术—检测技术与自动化装置] TP216.1[自动化与计算机技术—控制科学与工程]