High signal-to-noise ratio detection device and detection method applied to near field measurement of high power laser

Abstract

The invention belongs to the technical field of laser detection, and in particular relates to a high signal-to-noise ratio detection device and a high signal-to-noise ratio detection method applied tonear field measurement of high power laser. The detection device comprises a CCD sensor, a pre-amplification and pre-processing unit, a sampling conversion mechanism, an FPGA controller, a PHY chip and an optical fiber network interface. The detection device provided by the invention is mainly used for performing near field measurement of high power laser, can well detect the laser with differentstrength distribution, and thus accurate near field measurement is achieved. Meanwhile, the detection device aims at the high signal-to-noise ratio requirement when the high power laser is subjectedto near field measurement, can achieve imaging with a high dynamic range, a high signal-to-noise ratio and low uniformity, and can stably output a high quality laser measurement image. In addition, the detection device can flexibly select a sampling position and efficiently process sampling data, so that the flexibility of data processing is also greatly enhanced while the signal-to-noise ratio ofthe image is improved.

Description

technical field [0001] The invention belongs to the technical field of laser detection, and in particular relates to a high signal-to-noise ratio detection device and a detection method for high-power laser near-field measurement. Background technique [0002] In high-power laser devices, the light intensity distribution of the laser beam section has a great influence on the quality of the laser beam and the laser focus spot. In order to measure the light intensity distribution data in the large dynamic range of the beam section, it is necessary to correspond to A linear detector with a large dynamic range matches it. The dynamic range of laser light that can be detected by many existing detection devices is very small. When detecting high-power laser light, the detector is prone to partial image saturation or small detection range, resulting in partial data distortion. [0003] In addition, it is necessary to obtain high-quality image information during laser near-field me...

AI Technical Summary

Problems solved by technology

[0004] Due to the existence of random noise in the sampling area when the traditional detector performs signal sampling, the final AD converted pixel data contains a part of random noise, which not only reduces the signal-to-noise ratio of the image but also makes the response of the detector non-uniform In addition, when the CCD output analog signal is sampled and converted, the AD converter samples at different positions within a single pixel, which also has a certain impact on the signal-to-noise ratio of the obtained image

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