Time-sharing phase short-range laser rangefinder and method for improving measurement accuracy

Abstract

The invention discloses a time-sharing phase short-range laser rangefinder and a method for improving measurement accuracy. The laser rangefinder comprises a transmitting unit, a receiving unit, a phase-detecting main control unit, keys/LCD (liquid crystal display) and a mirror driving auxiliary unit, wherein the keys/LCD and the mirror driving auxiliary unit comprise a key module, an LCD module and a mirror driving module comprising a micro-motor, a mirror and a mirror driving mechanism, and the core of the phase-detecting main control unit is the chip MCUAtmega128 embedded with an AD (active directory) interface. The time-sharing phase short-range laser rangefinder has the advantages that a set of optical path and electric circuit of the rangefinder with the time-sharing mechanism is capable of completing the functions of two sets or three sets of optical paths and electric circuits by timesharing; in addition to optical path ranging, reference signal and measurement signal are in the same signaling pathway from beginning to end; and phase error caused by inconsistencies of the optical path and electrical path of the reference/ranging signals as well as dispersion and temperature change characteristics of electronic device parameters is eliminated, and thus, ranging accuracy and reliability are improved, and cost is reduced.

Description

technical field [0001] The invention relates to the technical category of a phase-type laser range finder, in particular to a time-sharing phase-type short-distance laser range finder and a method for improving measurement accuracy. Background technique [0002] Laser (laser) began in the 1960s. In 1961, the Hughes Aircraft Company of the United States successfully developed the world's first laser range finder; the laser range finder involves many disciplines such as laser, optics, electronics, signal processing, and precision machinery. And technology, is a widely used length measurement equipment, has the advantages of high precision, non-contact, available day and night, reliable performance; at present, laser distance meter has become a standing instrument in industrial production, scientific research and daily life. The history of laser ranging in my country can be traced back to the 1970s, which is not too late compared with foreign countries; the relevant theory and ...

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Problems solved by technology

[0028] The above beneficial exploration, based on the mainstream structure of the phase laser rangefinder, proposes the improved design of the internal optical path switching device, the grouping processing method of the phase difference sampling data, etc.; the improvement results have certain reference value, but there are still limitations in the exploration results: Research Most of the work focuses on a single specific link of the rangefinder, lacking an overall and systematic solution for the rangefinder, and the effect of improving the ranging accuracy is limited; therefore, it is necessary to use existing research results for in-depth research and innovation to improve the rangefinder. Accuracy and reliability of the instrument

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