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Quadrant uniformity calibration method for four quadrant photodetectors
Author(s): Yang Xue; Lijing Li; Siyuan Wang
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Paper Abstract

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.

Paper Details

Date Published: 12 March 2019
PDF: 6 pages
Proc. SPIE 11023, Fifth Symposium on Novel Optoelectronic Detection Technology and Application, 1102304 (12 March 2019); doi: 10.1117/12.2516342
Show Author Affiliations
Yang Xue, Beihang Univ. (China)
Lijing Li, Beihang Univ. (China)
Siyuan Wang, Beihang Univ. (China)


Published in SPIE Proceedings Vol. 11023:
Fifth Symposium on Novel Optoelectronic Detection Technology and Application
Qifeng Yu; Wei Huang; You He, Editor(s)

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