A device for examing the imaging plane’s illumination nonuniformity of Wide FOV and short-focus optical imaging system

Deng-kui Kang; Chang-lu Jiang; Liang Yuan; Jia-ming Lin; Hong Yang; Xue Zheng; Yu Guo; Shi-bang Ma

doi:10.1117/12.2035272

21 August 2013 A device for examing the imaging plane’s illumination nonuniformity of Wide FOV and short-focus optical imaging system

Deng-kui Kang, Chang-lu Jiang, Liang Yuan, Jia-ming Lin, Hong Yang, Xue Zheng, Yu Guo, Shi-bang Ma

Author Affiliations +

Proceedings Volume 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications; 89082Q (2013) https://doi.org/10.1117/12.2035272
Event: ISPDI 2013 - Fifth International Symposium on Photoelectronic Detection and Imaging, 2013, Beijing, China

Abstract

The imaging plane’s illumination nonuniformity is an important parameter for wide FOV and short-focus optical imaging system.But now the imaging plane’s illumination nonuniformity measurement device can not meet the requirements of wide FOV, high uniformity and wide dynamic range.A new device combined with assymmetric double-hemisphere technology was set up. It was composed of the special integrating sphere, CCD camera, precision displacement mechanism, image acquisition, and testing software.The CCD was pre-calibrated and the testing software realized a auto-correction,image acquisition, display and the illumination nonuniformity calulation.The light source was calibrated by the national standard color temperature lamp.The device can provide a Lambert object surface .The advantages of the device were that the FOV was as largely as 100°,and a wide illumination range of (10-3~103)Lx was achieved. An optimal simulation of assymmetric double-hemisphere was calculated by LightTools,it was proved that the illuminace nonuniformity at the outlet was better than 1.7%.Finally, the illumination nonuniformity of the integrating sphere and a wide FOV and short-focus lens were respectively measured.The results show that, the illumination uniformity of the integrating sphere is less than or equal to 1.49%,and the imaging plane’s illumination nonuniformity of the lens is 10.24%.

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Deng-kui Kang, Chang-lu Jiang, Liang Yuan, Jia-ming Lin, Hong Yang, Xue Zheng, Yu Guo, and Shi-bang Ma "A device for examing the imaging plane’s illumination nonuniformity of Wide FOV and short-focus optical imaging system", Proc. SPIE 8908, International Symposium on Photoelectronic Detection and Imaging 2013: Imaging Sensors and Applications, 89082Q (21 August 2013); https://doi.org/10.1117/12.2035272

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KEYWORDS

Integrating spheres

Lamps

Imaging systems

Calibration

Charge-coupled devices

Halogens

CCD cameras

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