Detection performance testing method and device for photoelectric detection system of laser radar

Abstract

The invention discloses a detection performance testing method and device for a photoelectric detection system of a laser radar. According to the invention, with a tungsten halogen lamp and a gratingmonochromator, a testing light signal with the precisely adjustable wavelength and strength is outputted; and an echo signal received actually by a laser radar is simulated from the aspects of wavelength and strength. On the basis of combination of silicon and indium-gallium-arsenide standard detectors, performance indexes like an optical transmittance, an input light intensity-output voltage response curve, and a linear response range of the photoelectric detection system of the laser radar are measured simultaneously. Relevant test results can be used for assisting in the parameter design ofthe photoelectric detection system of the laser radar, so that the installation and calibration quality of the photoelectric detection system of the laser radar is improved and the good quality of the measurement data during the application process of the laser radar is ensured.

Description

technical field [0001] The invention belongs to the technical field of atmospheric and environmental laser remote sensing measurement, and in particular relates to a performance testing method and device in the design and production process of a laser radar photoelectric detection system. Background technique [0002] Lidar is an important active remote sensing instrument, which is mainly used for the measurement of atmospheric environment components and their parameters. With the increasing emphasis on atmospheric environment monitoring in China, the application of laser radar is increasing rapidly, and the market's research and development efforts and production capacity requirements for laser radar products are also continuously increasing. The photoelectric detection system is an important part of the laser radar, and the laser radar receives and processes the atmospheric echo signal through the photoelectric detection system. The photoelectric detection system is a com...

AI Technical Summary

Problems solved by technology

The resulting problem is: in the production process of the laser radar, due to the inability to grasp the optical transmittance and response curve of the photoelectric detection system in real time, the testers cannot timely grasp the installation and debugging quality of the photoelectric detection system, which affects the quality of the photoelectric detection system. The production efficiency of laser radar; in the process of using laser radar, because the linear response range of the photoelectric detection system is unknown, users cannot accurately analyze the effective detection capability of the photoelectric detection system, which affects the quality of laser radar observation data

[0004] The main reason for the above problems is that it is difficult to develop a general-purpose LiDAR photoelectric detection system detection performance test device

It is specifically reflected in: First, the lidar operating band spans a wide range, usually from near-ultraviolet to near-infrared bands; secondly, the lidar echo light intensity dynamic range spans a wide range, usually up to 5 orders of magnitude; finally, the lidar photoelectric detection system There are usually multiple receiving channels, and the types of devices used in each channel are complex

The existence of the above objective factors has led to the development of a general-purpose lidar photoelectric detection system performance measurement device, which has certain technical difficulties.

[0005] The performance test method of the existing photoelectric detection system usually uses a laser light source as the beacon light, which is used for the alignment of the optical path and the test of the optical transmittance during the installation and calibration process. The intensity and intensity cannot be adjusted in time, and the response curve and linear response range test of the photodetection system under different wavelengths, different input light intensities, and different detector gain conditions cannot be realized, so the generality of the existing test methods is poor

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