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啁啾脉冲频谱干涉仪是一种常用的高时间分辨连续测试仪器,但是时间分辨能力和测试量程之间的相互制约关系限制了其在超快变化、大时间尺度物理过程研究中的应用。利用线性啁啾脉冲序列和耦合光谱仪的条纹相机记录系统,设计了一种扫描频谱激光干涉仪。通过理论分析和数值模拟研究了扫描频谱激光干涉仪的工作原理,论证了其可行性,该干涉仪可以实现相位扰动信号的精确测量,且具有相当于啁啾脉冲频谱干涉仪的高时间分辨能力和数倍的测试量程。数值模拟分析了条纹相机采样时间对扫描频谱激光干涉仪测量结果的影响,发现在无噪声情况下,采样时间对测量结果的影响可以忽略,但是当存在数据噪声时,测量误差会随着采样时间的减小而增大。
Chirped pulse spectrum interferometer is a commonly used high-resolution time-resolved continuous testing instrument. However, the mutual restraint relationship between time resolution and testing range limits its application in the research of ultra-fast and large time-scale physical processes. A scanning spectrum laser interferometer was designed by using the stripe camera recording system of linear chirped pulse sequence and coupled spectrometer. The working principle of the scanning spectrum laser interferometer is studied through theoretical analysis and numerical simulation, and its feasibility is demonstrated. The interferometer can accurately measure the phase perturbation signal and has the high time resolution equivalent to the chirped pulse spectrum interferometer And several times the test range. The effect of sampling time on the measurement results of scanning laser interferometer was analyzed by numerical simulation. It is found that the sampling time has negligible effect on the measurement results under no noise condition. However, when there is data noise, the measurement error will vary with the sampling time Increase and decrease.