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A Restoration and Display Method of Laser Spot Image by Array Detection Method

A technology of laser spot and display method, which is applied in the generation of 2D images, photometry with electric radiation detectors, image enhancement, etc., can solve the problems of spot inflection point, peak power deviation, and large difference in spot shape, etc., to achieve The placement position is not sensitive, the error is reduced, and the effect of accurately restoring the spot image

Active Publication Date: 2021-04-02
NORTHWEST INST OF NUCLEAR TECH
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Problems solved by technology

[0003] There are certain deficiencies in the linear interpolation method in practical applications: 1) The peak power deviation of the spot is large
In practical applications, due to the position of the measurement system, it cannot be guaranteed that the detector can accurately detect the peak light intensity point of the laser spot, and linear interpolation cannot reconstruct the peak point, so there is a large deviation in the measurement of the peak power
2) There is a large difference in the restored spot shape
When the spatial sampling interval is large, the light spots restored by the linear interpolation method will have an inflection point, and a smooth image cannot be obtained, resulting in a large deviation from the actual light spots

Method used

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  • A Restoration and Display Method of Laser Spot Image by Array Detection Method
  • A Restoration and Display Method of Laser Spot Image by Array Detection Method
  • A Restoration and Display Method of Laser Spot Image by Array Detection Method

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[0056]Using the method of the present invention to perform frequency domain filtering on the sampled spot data to restore the spot, and compare with the result of linear interpolation using the sampled data, Figure 4(a), Figure 4(b) and Figure 4(c) are the comparison results. Figure 4(a) is the original light spot, Figure 4(b) is the restored light spot by the linear interpolation method, and Figure 4(c) is the restored light spot by the method of the present invention. The original light spot is the integrated light spot obtained without processing. It is obvious that compared with the original light spot, the processing result of the spectrum filtering method of the present invention is more similar to the original light spot, and can reflect some details of the light spot.

[0057] Keeping the sampling interval constant, randomly shaking the same spot makes the position of the detection point constantly change, and the error of the peak light intensity of the restored spot i...

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Abstract

The invention relates to a restoration display method for an array detection method laser spot image, which comprises the following steps: filtering out an aliasing high-frequency component by utilizing a frequency domain filtering method, keeping a low-frequency component which comprises most information of a long-exposure integral spot, reconstructing data lost by array sampling, and further approximately restoring the shape of the spot. Compared with an existing linear interpolation method, the method has the advantages that the error of light spot restoration can be reduced, and the methodis insensitive to the arrangement position of a detection point, so that a light spot image can be restored more accurately.

Description

technical field [0001] The invention relates to a restoration and display method of a laser spot image used in an array detection method, which is a method for approximately restoring the appearance of the spot after the array sampling data is processed by frequency domain filtering. Background technique [0002] In laser remote transmission experiments, the array detection method based on photodetectors is an effective means to measure the spatiotemporal distribution of laser far-field spot intensity. Usually, the photodetectors are arranged in a lattice structure of several rows and columns, and each detector Space sampling is carried out on the spot irradiated in the area, and finally the laser spot is obtained by image restoration. Due to the limited area of ​​the photosensitive element of the photodetector, what the photoelectric array detection method measures is the discrete value of the spatiotemporal distribution of the spot intensity after spatial sampling, and par...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T11/00G01J1/42
Inventor 谢贤忱杨鹏翎陈绍武赵海川王振宝王飞张磊武俊杰
Owner NORTHWEST INST OF NUCLEAR TECH