A laser spot detection method and system

Abstract

The invention discloses a laser spot detection method and system. The method includes: acquiring multiple consecutive frames of background images and spot images; calculating the overall average pixel value and frame average image of the background image; calculating a first noise baseline value; determining the first spot area and the second spot area of ​​the spot image; Calculate the second noise baseline value and the third noise baseline value; calculate the first centroid coordinate and the first light spot radius; calculate the second centroid coordinate and the second light spot radius; determine whether the difference between the first light spot radius and the second light spot radius is greater than Preset error value; if yes, change the size of the first spot area and the second spot area, and return to calculate the second noise baseline value and the third noise baseline value; if not, based on the first centroid coordinates and the first spot radius , the second centroid coordinate and the second spot radius determine the centroid coordinate and diameter of the spot image. The method or system of the present invention can improve the detection accuracy of laser spots.

Description

technical field [0001] The invention relates to the technical field of laser beam performance detection, in particular to a laser spot detection method and system. Background technique [0002] At present, the accurate detection of light spots has a wide range of applications in laser transmission, astronomical observation, laser quality evaluation, and beam size detection. Laser spot detection methods mainly include trepanning method, knife-edge method, image sensor detection method, photography method, slit method, threshold time method, etc. The disadvantage of the photographic method is that it is not easy to control the exposure time, which can easily cause overexposure or underexposure, which affects the accuracy of spot detection, and data processing is troublesome; the disadvantage of the scanning method is that the minimum spot position and its size cannot be determined at the same time, and the measurement accuracy is affected by the detector response. The influen...

AI Technical Summary

Problems solved by technology

The baseline threshold method is to improve the signal-to-noise ratio of the spot image by setting the baseline, but when the signal and noise are alternately together, the separation of the signal and the noise cannot be completed; the window method is to reduce the influence of the noise by changing the detection window size , but it can only reduce the influence of the noise outside the window on the calculation of the laser spot size, but it can't do anything to the noise inside the detection window

[0004] The existing laser spot detection method is restricted by various factors, resulting in low detection accuracy

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