FJZ-250型高速分幅相机时间测量不确定度分析

Investigation of Time Measurement Uncertainty for Model FJZ-250 High Speed Rotating Mirror Framing Camera

FJZ-250型高速转镜分幅相机因转镜速度的不可重复性,光机结构的构造原理和控制系统各路高压触发时间的漂移,导致了时间测量的不确定度。为此,须对相机测量数据进行校正。阐述了校正方法、提供了逐幅校正位置误差的修正系数。若以预置转速对应的名义周期值去处理测量结果,则相机的时间测量合成不确定度将达1%,对名义周期值和名义幅间间隔时间值进行修正后,则可降至0.3%。

In order to precisely determine the time interval recorded by the framing camera, Using practical rotating mirror speed instead of the nominal values is needed to correct the time interval error for each frame and to estimate the trigger jitter caused by the high voltage pulse generator in the camera control unit. The investigation results show that the combined standard uncertainty can be reached 1%. After taking measures, it deduced to 0.3%.