Optical axis calibration system and method of laser range finder, and laser parameter measurement method

Abstract

The invention discloses an optical axis calibration system and method for a laser range finder, and a laser parameter measurement method. The system is characterized by comprising a test main system and an auxiliary system, wherein the test main system comprises a white light source, a reflection assembly and a CCD camera, the auxiliary system comprises a three-dimensional platform, a laser rangefinder, a square tube front lens and a pyramid prism, the three-dimensional platform adjusts the positions of X, Y and Z mechanical axes of the laser range finder and the square tube front lens, whitelight emitted by the white light source passes through the reflection assembly and then is reflected to form a parallel light source, the parallel light source reaches the CCD camera to form a pointlight source light spot to form an adjusting reference point coordinate position, the square tube front lens is used for observing the adjusting reference point coordinate position and calibrating theposition of the mechanical axis of the laser range finder, laser emitted by the laser range finder is used for calibrating the position of an optical axis by comparison of the adjusting reference point coordinate position. According to the invention, the accuracy and efficiency of equipment calibration are improved, the accuracy of parameter measurement is also improved, and the accuracy of subsequent distance measurement of the equipment is improved.

Description

technical field [0001] The invention relates to a laser distance measuring machine, in particular to an optical axis calibration system and method of the laser distance measuring machine and a laser parameter measuring method. Background technique [0002] With the continuous development of photoelectric countermeasure equipment for various domestic military services, the recognition and tracking of long-distance (3km to 20km) targets is one of the basic functions of all photoelectric reconnaissance equipment. Platform laser range finder. [0003] The laser range finder that realizes the above functions is based on the principle of the direct time-of-flight method, or the pulse laser method, which is usually developed by combining all-solid-state laser technology, optical technology, weak light signal detection technology and conventional semiconductor power drive technology. Detect the light and return light signals, trigger the time-to-digital converter in the control sys...

AI Technical Summary

Problems solved by technology

[0006] At present, the laser parameters (beam spread angle, emission optical axis stability and light intensity distribution) of the laser rangefinder can be measured by means of a conventional infrared CCD, but when the laser emitted by the laser in the laser rangefinder passes through the emission optical system , if there is aberration in the optical system or the optical lenses in the lens are not strictly concentric and coaxial, or the optical axis of the laser exit is not parallel to the optical axis of the emitting lens, it will cause the measurement error of the laser beam divergence to increase, and the light intensity distribution will be uneven. The center is inconsistent with the center of the transmitting lens, which will eventually reduce the long-range ranging capability of the laser rangefinder

From the perspective of the receiving optical system, the installation of the existing optical lens is guaranteed by design and processing. There is no unified or clear judgment standard for the focusing ability of the return light signal. Usually, repeated actual measurements are used to achieve as much focus as possible. This is not only low work efficiency, but also has a large focusing error, which will also reduce the laser ranging capability

On the other hand, the emitting optical axis and receiving optical axis are usually only reflected by a throwing mirror and then focused on the infrared display probe, and the focus position is found by human eyes to adjust the optical axis coaxiality, which is suitable for short-distance For laser rangefinders, the error is not enough to affect its ranging capability, but for long-distance laser rangefinders, its disadvantages become obvious. Due to the limited resolution of the human eye and the focus spot is on the order of mm, the human eye can distinguish There will be no error of the order of μm, which will lead to an increase in the error of the beam divergence angle test, and it is difficult to guarantee the accuracy of the coaxial calibration. These will cause a partial loss of the distance measurement capability, and the distance measurement accuracy is not high.

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