A Practical Method for Locating the Centroid of Gaussian Spot of High-precision Four-quadrant Detector
A four-quadrant detector and center-of-mass positioning technology, which is applied in the direction of optical devices, instruments, and measuring devices, can solve problems related to spot radius and achieve high positioning accuracy, fast processing speed, broad application prospects and practical value.
Active Publication Date: 2020-11-10
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
[0004] The technical problem solved by the present invention is to overcome the shortcomings of the existing algorithm to directly calculate the centroid of the spot, which is related to the radius of the spot, and provide a practical high-precision four-quadrant detector Gaussian spot centroid positioning method, which greatly improves the positioning accuracy and speeds up the processing. speed and increased ease of use
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[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0044] see Figure 1-3 , a practical high-precision four-quadrant detector Gaussian spot centroid positioning method, including the following steps:
[0045] Step 1. Use the four-channel output photocurrent of the four-quadrant detector to calculate the solution value of the spot centroid in the x and y directions and Its calculation formula is:
[0046]
[0047]
[0048] In the formula, I A , I B , I C , I D are the photocurrents of the four qu...
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The invention is a practical high-precision four-quadrant detector Gaussian spot centroid positioning method, which relates to the field of laser spot positioning, and solves the technical problem of overcoming the shortcomings of existing algorithms that directly calculate the spot centroid and the spot radius. The steps are as follows: Step 1, use the four-channel output photocurrent of the four-quadrant detector to calculate the solution value of the spot centroid; Step 2, take the center of the four-quadrant detector as the coordinate origin, establish a rectangular coordinate system, and use the Gaussian spot energy distribution model , according to the accuracy requirements, construct a lookup table corresponding one-to-one between the calculated value of the spot centroid and the relative position; step 3, find out the corresponding relative position in the lookup table constructed in step 2 according to the calculated value in step 1; step 4. If the accuracy does not meet the requirements, correct the search results in step 3, and if the accuracy meets the requirements, proceed to the next step; step 5, calculate the spot centroid based on the spot radius and the relative position in step 4.
Description
technical field [0001] The invention relates to the technical field of laser spot positioning, in particular to a practical high-precision four-quadrant detector Gaussian spot centroid positioning method. Background technique [0002] Quadrant Detector (QD) is a commonly used position detection sensor. It has been widely used due to its simple signal processing circuit, wide wavelength response range, low inherent noise level, high sensitivity and fast response speed. It is used in fields that need to provide high-precision micro-displacement or angle measurement, such as laser alignment, laser guidance, laser monitoring, laser tracker and space laser communication. [0003] There are two main factors that affect the detection accuracy of the laser spot position: one is the random error caused by the random fluctuation of the calculated value caused by the noise of the signal processing circuit, background light and atmospheric turbulence. The other is the inherent error of...
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IPC IPC(8): G01B11/00G06F30/20
CPCG01B11/00
Inventor 陈云善吴佳彬高世杰王景源耿天文刘永凯
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI