Automatic test of optical axes parallelism for low-frequency narrow pulse laser

Zhi-bin Chen; Ming-xi Xue; Yu-xiang Liu; Bao-hua Liu

doi:10.1117/12.2033044

21 August 2013 Automatic test of optical axes parallelism for low-frequency narrow pulse laser

Zhi-bin Chen, Ming-xi Xue, Yu-xiang Liu, Bao-hua Liu

Proceedings Volume 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications; 890814 (2013) https://doi.org/10.1117/12.2033044
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

Low-frequency narrow pulse infrared laser are widely used in laser ranging equipments, its laser spot is hard to capture, the system’s precision of collimation measure and control are decided by the performance of optical axes parallelism. The automatic test technology of optical axes parallelism for low-frequency narrow pulse laser is discussed in hardware and software, in the aspect of hardware, through lattice up-conversion board the nanosecond infrared laser is converted into millisecond visible laser which can be detected by normal CCD, the CCD capture system in defocus mode can not only protect CCD but also enhance the test precision; In the aspect of software, the algorithms of image process is adopted to control CCD’s defocus and extract the parameters of crosshair and laser spot, such as: the DCT transformation with region selected, recover blurred image, hybrid filter, hough transformation of line and ellipse detection. Finally the automatic test of optical axes parallelism is realized, the experiments show that the precision of optical axes parallelism is 0.05mrad.

Citation Download Citation

Zhi-bin Chen, Ming-xi Xue, Yu-xiang Liu, and Bao-hua Liu "Automatic test of optical axes parallelism for low-frequency narrow pulse laser", Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 890814 (21 August 2013); https://doi.org/10.1117/12.2033044

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KEYWORDS

Charge-coupled devices

Pulsed laser operation

Image filtering

Laser optics

Image processing

Image acquisition

Control systems

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