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Measurements of velocity distribution along depth using low coherence interferometry

机译:使用低相干干涉测量法测量沿深度的速度分布

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摘要

A new optical measurement method of a flow velocity distribution along the depth using low coherence interference techniques is proposed and demonstrated. In the proposed method, fluctuations of the interference signal formed with the reference and backscattering lights are detected by the optical heterodyne scheme. It is shown experimentally that the width of the spectrum of the interference signal is proportional to the flow velocity. The dynamic range is determined by the time constants of the fast Fourier transform (FFT) processor and lock-in amplifier used in the experiment.
机译:提出并论证了一种新的基于低相干干涉技术的沿深度流速分布的光学测量方法。在所提出的方法中,通过光学外差方案检测与参考光和后向散射光形成的干涉信号的波动。实验表明,干扰信号的频谱宽度与流速成正比。动态范围由实验中使用的快速傅里叶变换(FFT)处理器和锁相放大器的时间常数决定。

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