转镜式高速摄影机角跟踪精度的检测

Detection of angular tracing precision of rotating mirror house in streak camera

为了提高转镜式高速摄影机测量弹丸运动轨迹的精度,本文通过合理假设和理论推导,依据弹丸外弹道飞行运动模型得到了弹丸飞行过程的数学模型。结合室内检测条件,设计了用于转镜式高速摄影机角跟踪精度的检测装置并分析了测试原理。用该设备实测了转镜式高速摄影机的角跟踪精度,并对检测装置的测量不确定度来源进行了分析。结果显示:被测转镜式高速摄影机的角跟踪精度为(0.34±0.06)°,检测装置的相对不确定度为3.0″;不确定度来源主要为角度测量不确定度和焦距测量不确定度。实验结果表明,设计的检测装置具有较高的准确度和可靠性。

On the basis of the theoretic deduction and corresponding reasonable assumption,a mathematic model was built according to the flight model of exterior trajectory to improve the angular tracing precision of rotating mirror house in a streak camera.A test device was designed and developed for the angular tracing precision of rotating mirror house in the streak camera.The measuring principle of the test device was introduced,the angular tracing precision was measured by the developed device and the uncertainty factors of the tested device were analyzed.The tested results show that the angular tracing precision of the high speed rotating mirror in the streak camera is（0.34±0.06）°,the relative uncertainty of the tested device is 3.0″and the main error sources come from interpretation and servo control.It concludes that the tested device designed has higher precision and reliability.