We demonstrate a laser-based displacement measurement using an intensity modulator as a simple and wide-band intensity correlator. The proposed method applies intensity modulation not only to the output probe beam but also to the reflected beam from a target, where the fundamental frequency of modulation signal is the same for both, but the phase of modulation signal for the reflected beam is also modulated. The displacement is measured using harmonic signals from a photodetector. The principle is verified for 40 mm and 16 m ranges of displacement measurement, where the relative measurement uncertainty of is achieved.

中文翻译：

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使用强度调制和相位调制的射频信号进行激光位移测量

我们演示了使用强度调制器作为简单的宽带强度相关器进行基于激光的位移测量。所提出的方法不仅将强度调制应用于输出探测光束，而且还将其应用于来自目标的反射光束，其中调制信号的基本频率对于两者都是相同的，但是反射光束的调制信号的相位也被调制。使用来自光电探测器的谐波信号测量位移。在40 mm和16 m的位移测量范围内验证了该原理，从而实现了相对测量不确定度。