Mr. Kexuan Wu Profile

Kexuan Wu

at Beijing Zhenxing Institute of Metrology and Measurement

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Proceedings Article | 29 December 2023 Paper

Night vision measuring instrument

Zexuan Li, Jiapeng Wang, Shangzhong Jin, Chunlian Zhan, Kexuan Wu

Proceedings Volume 12976, 129761K (2023) https://doi.org/10.1117/12.3009409

KEYWORDS: Night vision, Equipment, Design, Night vision systems, Optical design, Standards development, Integrating spheres, Image resolution

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In night vision technology, due to the passive technology's unidirectional and high concealment advantages, it has been paid attention to, among which the low light level night vision instrument has obtained rapid development. With the improvement of the performance of low light level night vision instrument, it is very important to test the index of high resolution and wide field of view to ensure the comprehensive performance of night vision instrument. In China, in the development of low-light night vision instrument, many standard equipment in the laboratory are used to piece together, or the equipment developed is a general low-light test equipment, and a special and standard low-light night vision instrument tester has not been developed. In this study, a comprehensive measurement method of night vision is proposed. Through the design of resolution, contrast test module, field of view Angle test module and data acquisition system, a complete and multi-functional test system is formed, in which the system aperture is greater than 110mm, the resolution test range is 0.06~2.6mrad, and the field of view Angle measurement range is ±25°. The light source brightness ranges from 1.6×10^-5 to 5×10^-3 cd/cm². Through the docking verification with the night vision instrument, the low light level night vision instrument tester has realized the accurate measurement of the low light level night vision instrument's resolution, field Angle, contrast and other indicators, which provides a guarantee for the performance of the low light level night vision instrument.

Proceedings Article | 15 February 2022 Paper

Design of PWM-based spectrum tunable light source

Shuhui Yang, Jiapeng Wang, Wanglin Yang, Xin Huang, Kexuan Wu, Fuzhong Bai, Jianliang Li

Proceedings Volume 12166, 1216658 (2022) https://doi.org/10.1117/12.2617511

KEYWORDS: Light sources, Light emitting diodes, Stars, Tungsten, Lamps, Control systems, Light, Calibration, Star sensors, Spectroscopy

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Starlight navigation is a navigation technology with strong anti-interference ability, which can output aircraft attitude, azimuth and other information. The star sensors not only have the highest measurement accuracy, but also have no time drift error, so that they become the most widely used attitude sensors in the aerospace field. The star sensor shall be calibrated before being put into use to ensure the accuracy of the star sensor. When the star simulator is used to calibrate the magnitude of the star sensor, the mismatch between the spectrum of the star simulator and the simulated star spectrum will produce a large magnitude simulation error. Therefore, a spectral tunable light source based on pulse width modulation is studied and designed in this paper, which can simulate the stellar radiation at different color temperatures, in order to solve the high-precision magnitude calibration of star sensor under different color temperatures. The spectrum tunable light source based on PWM control can realize 3000K ~ 20000k spectrum modulation within 360 ~ 900nm, the output optical power is stable, the error of spectrum simulation is better than ±0.1, and the uniformity of light source is better than 97%. It can be used for high-precision radiation calibration of star sensor with different color temperature. The problem of spectrum mismatch between star sensor and star simulator is solved, and the error of magnitude simulation is reduced.

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