突发数字相关器作为激光多普勒测速信号处理器。

Burst digital correlator as laser-Doppler velocimetry signal processor.

作者信息

Ikeda Y, Nakajima T

出版信息

Appl Opt. 1996 Jun 20;35(18):3243-9. doi: 10.1364/AO.35.003243.

DOI:10.1364/AO.35.003243

Abstract

A burst digital correlator (BDC) has been developed to obtain flow-velocity information at high data rates from wideband laser-Doppler signals of low signal-to-noise ratio (below 0 dB). Results with artificial signals show that, over a signal bandwidth of 5-120 MHz, the BDC has a measurement accuracy of less than 0.4% at a maximum data rate (number of measurements per second) of 208 kHz when 64 signal samples are correlated. The accuracy is better than 0.05% with a sample size of 512. The performance of the BDC was also evaluated in practical measurements of near-wall and strongly oscillatory recirculating flows.

摘要

已开发出一种突发数字相关器（BDC），用于从低信噪比（低于0 dB）的宽带激光多普勒信号中以高数据速率获取流速信息。人工信号的测试结果表明，在5-120 MHz的信号带宽内，当对64个信号样本进行相关处理时，BDC在208 kHz的最大数据速率（每秒测量次数）下测量精度小于0.4%。样本大小为512时，精度优于0.05%。还在近壁和强振荡回流的实际测量中评估了BDC的性能。