Mr. Junyi Chen Profile

Junyi Chen

at Huazhong Univ of Science and Technology

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Proceedings Article | 18 December 2019 Paper

Development of photoelectric parameter test system for anti-glare PLZT goggles

Junyi Chen, Ainong Xiao, Yang Li, Sha Luo, Danfeng Wu, Yanan Zeng

Proceedings Volume 11338, 1133807 (2019) https://doi.org/10.1117/12.2540431

KEYWORDS: Goggles, Control systems, Light sources, Sensors, Transmittance, Signal detection, Time metrology, Light emitting diodes, Integrating spheres, Data processing

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PLZT is an excellent electro-optic material. The anti-glare goggles composed of PLZT and driving circuit have a good application in strong laser protection. With the increasing popularity of anti-glare PLZT goggles, the measurement of the photoelectric parameters of PLZT goggles becomes important. This article aims to develop an optoelectronic parameter measuring system for the anti-glare PLZT goggles. When the change of the illuminance or the illuminance of the light incident on the PLZT surface reaches a certain threshold, the PLZT driving circuit quickly controls the change of the working state of the PLZT and reduces the light transmittance of the PLZT. Avoid blindness or eyes burns during strong flashes. After the strong flash is over, the light transmittance can be automatically restored to normal conditions within a certain period of time. In this paper, the integrating sphere and high-power LED are used as the light source to generate uniform glare, and the microcontroller is used to control the output optical power. Two output windows are arranged on the integrating sphere, one is used to detect the actual output illuminance of the integrating sphere, that is the illuminance of the surface incident on the PLZT surface, and the PLZT to be detected is placed after the other window, and the illuminance after entering the PLZT is detected. Two photodiodes are used to detect the illuminance of the two beams, and the two results are used to calculate the light transmittance and change time through the PLZT.

Proceedings Article | 30 January 2019 Paper

Simulation and experimental research on the uniformity of the surface light source out from the integrating sphere

Sha Luo, Yanan Zeng, Junyi Chen, Lina Luo, Shizhen Tang

Proceedings Volume 10841, 108410K (2019) https://doi.org/10.1117/12.2506376

KEYWORDS: Integrating spheres, Light sources, Light, Image sensors, Signal attenuation, Sensors, Imaging systems, Manufacturing

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With the deepening of the application of photoelectric imaging technology, the measurement of image sensors and imaging system parameters becomes important. The non-uniformity of photoelectric response of image sensor pixels is an important index of the image sensor, which directly affects the imaging quality of the photoelectric imaging system. When measuring the non-uniformity of an image sensor, a widely applied method currently uses an integrating sphere to obtain a surface light source with a uniform irradiance, so as to eliminate the influence of non-uniformity of the light source on the measurement result. Take the plane at a certain distance from the exit of the integrating sphere as the surface light source. Taking into account the needs of practical use, this article added a cylinder as a darkroom between the exit surface of the integrating sphere and the surface light source. In order to obtain better uniformity of light source, the inner surface structure of the cylinder adopts a fine thread structure design. The process and conclusion of the simulation research of various parts of the system using optical simulation software ASAP are described in detail. The simulation studied the effects of the opening ratio of the integrating sphere, the length of the cylindrical darkroom, and the structural parameters of the fine thread on the uniformity of the output light source. The system was implemented in the laboratory and the measured results show that the light source produced by the system achieves the expected uniformity.

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