A fixed-cavity angular dispersion Fabry-Perot velocity interferometer was developed by applying a solid etalon to realize that this interferometer's structure was compact, the interference fringes obtained by it were adjustment-free and its fringe constant could be easily and accurately calibrated. This interferometer was used in the experiment with an electric gun to accelerate a 10-mm-diame-ter, 0. 25-mm-thick Mylar flyer. The interferometer gave good results even when the intensity of light reflected from the target changed 100 times. The measurement accuracy of the system was analyzed by taking account of etalon thickness error, unparallel etalon surfaces, fringe broadening, image aberration, and so on. And the velocity resolution and the temporal resolution were also analyzed.%发展了固定腔结构的角色散FP干涉测速系统,干涉仪结构紧凑,采用固定腔标准具,实现了干涉条纹永久免调,并且条纹常数的标定非常简单.该系统可用于靶面反射光强动态变化很大的场合,在电炮驱动Mylar膜飞片实验中,光强变化达100倍时仍然获得了很好的结果.分析了标准具厚度误差、标准具端面不平行、干涉条纹动态展宽和扫描图像畸变等因素对系统测量精度的影响以及系统的速度和时间分辨能力.
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