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Second Harmonic Measurement of Multi-Beam Laser Heterodyne for Linear Expansion Coefficient of Metal Based on Oscillating Mirror Sinusoidal Modulation

机译：基于振荡镜正弦调制的多光束激光外差对金属线性膨胀系数的二次谐波测量

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摘要

In order to improve the measurement accuracy of the linear expansion coefficient and signal processing speed of operation, this paper proposes a novel method of second harmonic measurement of multi-beam laser heterodyne for metal linear expansion coefficient, which is converted into the measurement of the length variation of linear expansion coefficient. Based on Doppler effect and heterodyne technology, loaded the information of length variation to the frequency difference of second harmonic of the multi-beam laser heterodyne signal by the frequency modulation of the oscillating mirror, and can get value of length variation caused by temperature variety after the multi-beam laser heterodyne signal demodulation. Processing this value by fast Fourier transform, can get length variation accurately, and eventually get value of linear expansion coefficient of metal by the calculation. Using this novel method, simulates measurement for linear expansion coefficient of metal rod under different temperatures by MATLAB, the result shows that: the relative measurement error of this method is just 0.08%.
机译：为了提高线性膨胀系数和信号处理速度的测量精度，本文提出了一种新的二梁激光外差的二次谐波测量方法，用于金属线性膨胀系数，转换成长度的测量线性膨胀系数的变化。基于多普勒效应和外差技术，通过振荡镜的频率调制将长度变化信息加载到多光束激光外差信号的二次谐波的频率差，并且可以获得温度多样的长度变化值多光束激光外差信号解调。通过快速傅里叶变换处理该值，可以准确地获得长度变化，最终通过计算得到线性膨胀系数的线性膨胀系数。使用这种新方法，模拟MATLAB不同温度下的金属杆线性膨胀系数的测量，结果表明：该方法的相对测量误差仅为0.08 \％。

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