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一、引言自一九八二年购进SXJ—02型激光测速仪以来,我们用它完成了科学基金资助的科研项目,并为研究生开设了实验流体力学课。在使用过中程,发现仪器的信号处理部分有很多不完善之处。频率跟踪器是个非线性环路,且易受环境因素的影响,因此,测量精度低;环路没有相应的数据处理部分,要得到平均速度需记录大量测量结果,进行繁杂的事后处理,靠人的判断去除干扰,用计算机进行统计计算等;测量不连续信号时,由于环路脱落百分比
I. INTRODUCTION Since the acquisition of the SXJ-02 laser gun in 1982, we have used it to complete scientific research projects funded by the Science Foundation and have provided experimental fluid mechanics classes for graduate students. In the use of the middle range, found that the signal processing part of the instrument there are many imperfections. Frequency tracker is a nonlinear loop, and susceptible to environmental factors, therefore, the measurement accuracy is low; the loop does not have the appropriate data processing part, to get the average speed to record a large number of measurement results, complicated post-processing, by people Judgment to remove interference, with a computer for statistical calculations, etc .; measurement of discrete signals, due to the percentage of loop off