Error Analysis of Exposure Time Measurement in Ultra High Speed Framing Camera
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摘要: 基于超高速光电分幅相机曝光的控制原理，从光纤切割精度和激光器精确同步两个主要影响因素出发，讨论了采用超快激光脉冲和光纤阵列形成光延时结合CCD相机的方法测量高速相机曝光时间的误差，并提出了降低误差的技术措施。分析表明，光纤切割精度和激光器精确同步引入的误差仅为皮秒级，对纳秒级的相机曝光时间测量的影响可以忽略。采用光纤束阵列法，实验测量了超高速光电分幅相机的曝光时间，对比测量值与标称值，二者吻合良好，验证了此方法的有效性。Abstract: Based on the control principle for exposure time of the ultra high speed framing camera, we examined the errors in the measurement of the gating time using a CCD to record the time-delay produced by the ultra-fast laser pulse and the fiber array, from pserpectives of the fiber cutting precision and laser precise synchronization, and presented a specific value.We offered a comprehensive analysis of the effect resulting from these two aspects for measuring the gating time of the ultra high speed framing camera, and then proposed some technical measures to reduce the error.The results show that the errors caused by the fiber cutting precision and laser precise synchronization are in picosecond scale, which is negligible for the gating time measurement of a nanosecond camera.Finally, we used this method to measure the gating time of the ultra high speed camera.The measured results show good agreement with the normal values, which verifies the effectiveness of this method.
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Key words:
- measurement /
- high speed photography /
- framing camera /
- exposure time /
- error
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图 3 通过光纤束阵列后的激光序列脉冲示意图
Figure 3. Schematic of laser pulse passing through the fiber array
图 4 激光阵列点像(曝光时间5~30 ns)
Figure 4. Image spots of laser pulse (Time of exposure:5~30 ns)
表 1 超高速分幅相机的曝光时间
Table 1. Exposure time of the high speed framing camera
Exposure time
(criterion)/(ns)Exposure time(measured)/(ns) CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 5 5 5 5 5 5 5 5 5 10 9 10 10 10 9 10 10 10 20 21 20 20 20 20 20 20 20 30 31 31 30 29 30 30 29 30 50 50 50 51 50 50 49 51 50 100 102 102 99 100 101 100 100 102 
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