Ms. Yang Xue Profile

Yang Xue

at Beihang Univ

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Proceedings Article | 12 March 2019 Paper

Quadrant uniformity calibration method for four quadrant photodetectors

Yang Xue, Lijing Li, Siyuan Wang

Proceedings Volume 11023, 1102304 (2019) https://doi.org/10.1117/12.2516342

KEYWORDS: Sensors, Calibration, Beam expanders, Photodetectors, Charge-coupled devices, Beam splitters, Light sources, Beam homogenizers, Attenuators, Signal processing

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In laser guidance, the response uniformity of the four quadrant photodetector has an important influence on the guidance accuracy. Each quadrant photodetector needs to measure the response consistency between quadrants and be calibrated to the same response. In this paper, large area uniform laser irradiation is used to measure the inhomogeneity between detector quadrants. The gain compensation method is used to calibrate the inhomogeneity between detector quadrants. The main core of this method is that it needs to be able to modulate the intensity of the light source; the area of the light source can be modulated, and the maximum area should be able to completely cover the four photosensitive surfaces of the detector; the light source is a beam of uniform light power. In order to solve the problem that the uniform light effect is not ideal in traditional measurement methods such as spreading beam and frosted glass scattering, a beam expander and a beam homogenizer are used to realize the high uniformity of the uniform light spot. The detector is mounted on the single axis turntable and rotated around the optical axis to make the light received on the detector more uniform. This method realizes a four-quadrant detector for consistency calibration of quadrant response in the range of optical power of a certain wavelength. The method is simple, precise, stable and easy to implement.

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