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Power-Spectrum-Analysis-Based Signal Processing System of Vortex Flowmeters

机译：基于功率谱分析的涡街流量计信号处理系统

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摘要

A power-spectrum-analysis-based signal processing system was developed for vortex flowmeters. This system consists of a digital signal processor (DSP), an analog input part, an output part, a keyboard input circuit, a guard circuit, a serial communication interface, and software. The sensor output signals are processed digitally using the power spectrum analysis based on fast Fourier transform, and the signal frequency reflecting the flow rate is calculated. With the change of sampling frequency and the spectrum correction, the measurement accuracy of the system is improved and the volumetric flow rate is obtained accurately. By means of adopting a DSP and processing signals while sampling data, the signal processing in real time is ensured. The experiments, including tests of the charge amplifier and signal processing system, and calibration of the vortex flowmeter, show that the performance indexes of the digital processing system are better than those of the conventional instruments for vortex flowmeters in the measurement accuracy, the turn-down ratio, and the adaptability.
机译：开发了基于功率谱分析的涡街流量计信号处理系统。该系统由数字信号处理器（DSP），模拟输入部分，输出部分，键盘输入电路，保护电路，串行通信接口和软件组成。使用基于快速傅立叶变换的功率谱分析对传感器输出信号进行数字处理，并计算出反映流量的信号频率。通过改变采样频率和频谱校正，可以提高系统的测量精度，并准确获得体积流量。通过采用DSP并在采样数据的同时处理信号，确保了信号的实时处理。实验包括电荷放大器和信号处理系统的测试以及涡街流量计的校准，这些实验表明，数字处理系统的性能指标在测量精度，转弯比，下降率和适应性。

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