Structured laser illumination planar imaging method for filtering stray light applied to temperature sensitive paints measurement

Sheng Wang; Jin-hai Si; Jing-feng Ye; Zhen-rong Zhang; Jun Shao; Guo-hua Li; Li-jun Wang

doi:10.1117/12.2523762

29 March 2019 Structured laser illumination planar imaging method for filtering stray light applied to temperature sensitive paints measurement

Sheng Wang, Jin-hai Si, Jing-feng Ye, Zhen-rong Zhang, Jun Shao, Guo-hua Li, Li-jun Wang

Author Affiliations +

Proceedings Volume 11046, Fifth International Symposium on Laser Interaction with Matter; 110460M (2019) https://doi.org/10.1117/12.2523762
Event: Fifth International Symposium on Laser Interaction with Matter, 2018, Changsha, China

Abstract

Stray light is the main noise source for planar imaging measurement technique, which can affect the accuracy of results directly. A method of Structured Laser Illumination Planar Imaging (SLIPI) was used to solve this issue. The key of SLIPI is periodic modulation of laser spatial intensity and implementation of post filtering algorithm. In this paper, cylindrical micro lens array was used to modulate the spatial intensity of laser periodically, which was compared with Ronchi ruling. The post filtering algorithm adopts phase-locked detection method. The signal results can be separated from the noisy image using only one measurement image by this method. SLIPI method has been used in Temperature Sensitive Paints measurement experiments. A diagnostic optical path combining cylindrical micro lens array and cylindrical mirror was designed for the need of surface light source irradiation. The results show that the method of SLIPI can be applied to most planar imaging measurement techniques, and the accuracy of two-dimensional parameter measurement can be further improved.

Citation Download Citation

Sheng Wang, Jin-hai Si, Jing-feng Ye, Zhen-rong Zhang, Jun Shao, Guo-hua Li, and Li-jun Wang "Structured laser illumination planar imaging method for filtering stray light applied to temperature sensitive paints measurement", Proc. SPIE 11046, Fifth International Symposium on Laser Interaction with Matter, 110460M (29 March 2019); https://doi.org/10.1117/12.2523762

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