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在单发、超快时间分辨的测量技术中,线性啁啾脉冲和光谱仪的结合使用是一种常见方法.本文以成像型光谱仪为记录系统,利用线性啁啾脉冲的频-时对应关系,设计了一种应用于自由面速度超快测量的速度干涉仪.理论研究了其工作原理和适用范围,该速度干涉仪可以实现皮秒量级的时间分辨,且速度灵敏度可调、易调,大大拓宽了速度干涉仪的应用范围.数值模拟了系统的测速过程,结果表明,重建速度信号与给定物体速度符合得很好,进一步验证了系统的可行性.
In the single-shot, ultra-fast time-resolved measurement technique, the combination of linear chirped pulse and spectrometer is a common method.In this paper, imaging spectrometer is used as the recording system, the frequency-time correspondence of linear chirped pulse is used to design A speed interferometer applied to the measurement of free surface velocity is studied theoretically and theoretically. The speed interferometer can realize the time resolution of picosecond order of magnitude, and the speed sensitivity is adjustable and easy to adjust. Which broadens the application range of the speed interferometer.The numerical simulation of the speed measurement process of the system shows that the reconstructed speed signal conforms well to the given object speed and further verifies the feasibility of the system.