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Four-quadrant detector calibration method adaptable to various beams

A four-quadrant detector and calibration method technology, applied in instruments, measuring devices, optical devices, etc., can solve the problem that the calculation error of the response measurement algorithm cannot be accurately described, and achieve high calculation accuracy and accurate calculation. Effect

Active Publication Date: 2021-09-03
NANJING UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

The traditional spot energy distribution model can only describe the ideal circular Gaussian spot, but for the elliptical Gaussian spot, the traditional response of each quadrant and the calculation error of the measurement algorithm cannot be accurately described

Method used

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  • Four-quadrant detector calibration method adaptable to various beams
  • Four-quadrant detector calibration method adaptable to various beams
  • Four-quadrant detector calibration method adaptable to various beams

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Experimental program
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Embodiment 1

[0069] (1) Verification and comparative analysis of the light intensity distribution model: In this embodiment, the correctness of the light intensity distribution model is firstly verified. Two kinds of lasers are used, and the shapes of the light sources are ellipse and circle respectively. Using formula (1) respectively, combined with the spot energy distribution data obtained by the beam quality analyzer, as shown in image 3 (a), (d), (g), fit the parameters of the light energy distribution model, and restore the spot distribution image of the model, such as image 3 (b), (e), (i), compared with the spot image, the residual error is obtained, such as image 3 (c), (f), (j). a)d) represents the elliptical light spot actually formed by the light source, g) represents the circular light spot actually formed by the light source, b) represents the energy distribution of the light spot restored by the commonly used circular model, e)i) represents the elliptical model passed in...

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Abstract

The invention discloses a four-quadrant detector calibration method that can adapt to various light beams. The specific steps are: according to the energy distribution law of the incident light, the energy distribution model is determined, and the white noise background light is determined according to the energy distribution model; according to the four-quadrant detection Determine the response value of each quadrant according to the quadrant size, blind area width, photoresponsivity and white noise background light of the detector; use the spot position measurement algorithm to calculate the output voltage value of each quadrant caused by Gaussian spot; according to the quadrant caused by Gaussian spot Using the four-quadrant positioning algorithm to calculate the actual offset of the center of mass of the spot, and determine the measurement error of the detector according to the actual offset of the center of mass of the spot. The invention adds the width of the blind area of ​​the detector into the model for calculation, so that the calculation accuracy is higher.

Description

technical field [0001] The invention belongs to the field of photoelectric measurement, in particular to a four-quadrant detector calibration method that can adapt to various light beams. Background technique [0002] Four-quadrant detector (4-QD) is a position sensitive device, which has the advantages of high sensitivity, high precision, and simple calculation. It is widely used in laser tracking fields such as laser guided weapons, laser radar, and space optical communication. In the tracking and detection system for point source targets, a four-quadrant detector is usually placed at the focal plane of the imaging lens to measure the movement of the center of mass of the spot at the focal plane to dynamically calculate the inclination of the incident wavefront. The photon noise of the signal light, the background light, and the noise of the detector itself cause tracking errors in the four-quadrant detector; and in the manufacturing process of the four-quadrant detector, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/00
CPCG01B11/00G01B21/042
Inventor 钱惟贤张骏陈钱顾国华任侃吴春红彭晓钰过玲钰刘泽伟杨锦清钱烨杨文广
Owner NANJING UNIV OF SCI & TECH