Self-adaptive closed loop adjustment laser range finding method and device

Abstract

The invention relates to a self-adaptive closed loop adjustment laser range finding method and device and belongs to the field of laser range finding. A liquid lens is used for replacing a common lens in a measurement system, liquid is used as a medium in the liquid lens, curvatures of two curved surfaces of the liquid lens can be changed via impressed voltage, a focal length of the liquid lens can be further changed, relative positions of light spots and a detector photosensitive surface are observed via use of an infrared camera, and therefore an aim of self-adaptive closed loop adjustment laser range finding can be attained; according to the self-adaptive closed loop adjustment laser range finding method and device, a self-adaptive closed loop can be used for controlling the liquid lens, curvature radiuses of the two curved surfaces of the liquid lens can be changed, the focal length of the liquid lens is therefore changed, and echo light spots are enabled to defocus; the method and device can help prevent problems of large energy design of the echo light spots, easy saturation of the detector and lowered precision during short quarter range finding operation. A range finding scope can therefore enlarged, and measurement precision can be improved.

Description

technical field [0001] The invention relates to an adaptive closed-loop adjustment laser ranging method and device, belonging to the field of laser ranging. Background technique [0002] With the rapid development of pulsed lasers and photoelectric detectors, pulsed laser ranging technology has been widely used in industry and national defense due to its advantages of long detection distance, high precision and strong anti-interference ability. At the same time, laser ranging technology is one of the key technologies of laser 3D imaging, and its ranging range, measurement accuracy and anti-interference ability directly determine the quality of 3D imaging. How to improve the ranging range, measurement accuracy and anti-interference of laser ranging is always a key problem that needs to be solved urgently, especially the large-scale change of detection distance is required (for example: the system needs to work normally from cm to km level), for pulse Laser distance measuring...

AI Technical Summary

Problems solved by technology

[0003] For pulsed laser ranging, in the case of short-distance target detection, when the detector is at the focus of the receiving lens, the echo signal strength is too strong and the energy density is too high, which makes the detector easy to saturate, thereby reducing the measurement accuracy; on the contrary In some cases, if the target is far away from the ranging system, or the detector is far away from the focal point of the receiving lens, the echo signal will be weak and it is difficult to effectively extract

Not only that, in actual working conditions, the pulse ranging system is also disturbed by external vibrations, especially on some load platforms, such as: vehicle, airborne, ship-borne, etc., which will cause the receiving lens to be off-axis or tilted, The relative position between the detector and the receiving system changes, and the echo signal is far away from the photosensitive surface of the detector, which is difficult to be effectively acquired by the detector

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