FFT周期图法在流速测量系统中的应用

Application of FFT Periodogram to Flow Rate Measurement System

针对测量水体流量的一般方法存在精度不够和抗干扰性能差等问题,以数字信号处理器为主控制器,结合快速傅里叶变换周期图法搭建突水流速测量系统。试验结果表明:该方法不仅能够扩大测量的量程,降低流量下限测量值,而且可提高测量精度,增加抗噪音干扰性能。

For the low precision and poor anti-jamming performance in measuring water flow via general methods,the fast Fourier transform( FFT) periodogram method was proposed. With digital signal processor as the main controller,FFT periodogram method was used to build water inrush velocity measurement system.Experimental analysis results show that the method not only can enlarge the range of measurement and reduce the flow limit measured values,but also improve the measurement precision and increase the noise robustness.