Ultrashort pulse laser ranging system

Abstract

The invention relates to an ultrashort pulse laser ranging system, which is characterized in that the system comprises two frequency reference sources, two lasers, two half-wave plates, an interference system, a spectroscope, a photoelectric detector, a cross-correlation balance detection device, and a signal processing device; The two frequency reference sources are respectively locked at repetition frequencies of the two lasers, and laser emitted by one of the lasers is transmitted into the interference system through one half-wave plate; laser emitted by the other laser is transmitted to the other half-wave plate, then is converged with laser emitted by the interference system at the spectroscope, and is divided into two beams of laser; one of the laser beams is detected by the photoelectric detector, and is transformed into an electric signal which is sent to the signal processing device; the other laser beam is detected by the cross-correlation balance detection device, and is transformed into an electric signal which is sent to the signal processing device; the signal processing device calculates the received two groups of electric signals so as to obtain a measured value ofa distance. The invention has the advantages of high precision, large measurement range, and high measuring speed, and is widely applicable to the measurement of absolute distances.

Description

Technical field [0001] The invention relates to a distance measuring system, in particular to an ultrashort pulse laser distance measuring system for absolute distance measurement. Background technique [0002] Traditional laser interferometry is an incremental distance measurement method, which requires a rail between the baseline and the target object, and the target object needs to move continuously along the rail during the measurement process. The laser absolute distance measurement (distance measurement without guide rail) is a method of directly measuring the distance between the baseline and the target object. Compared with the former, it has the advantages of wide application range and simple operation, so it has a strong application in the industry and aerospace fields. Demands and prospects, on the one hand, in high-speed railways, large aircraft, nuclear power and wind power and other large mechanical equipment systems, it is necessary to accurately measure high-preci...

AI Technical Summary

Problems solved by technology

Among them, the measurement accuracy of multi-wavelength laser interferometry technology is as high as micron, but the measurement range is limited by the length of the synthesized wavelength, and the measurement principle and device are relatively complicated, which is not conducive to the use in industry and aerospace

The traditional pulse laser ranging technology and phase laser ranging technology are very mature, and related products have already been released. The measurement range of these two technologies can reach the order of more than 100 meters, but the measurement accuracy is generally low. millimeter level

Therefore, the existing laser absolute distance measurement technology is difficult to meet the large-scale and high-precision measurement requirements in the industrial and aerospace fields

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