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 spectral interferometry is a commonly used continuous and high time-resolved diagnostic instrument, however, its applications in the fields of ultrafast and large timescales physics are constrained by the relationship between time resolution and test range. Utilizing linearly-chirped pulse series and a recording system of a spectrometer coupled streak camera, a scanning spectrum laser interferometer is designed. To demonstrate the feasibility, principle of the interferometer is studied theoretically and numerically. It is concluded that the scanning spectrum laser interferometer could measure phase perturbation signal accurately, and possesses the same time resolution and several times test range compared to chirped pulse spectral interferometry. Additionally, in the recording system, the influence of sampling intervals on the measurement results of the scanning spectrum laser interferometer is numerically analyzed. The results show that the influence could be ignored while raw data are clean, but if noise is contained, the measurement errors would increase gradually with the sampling intervals decreasing.