High precision switching free distance measuring instrument and high precision switching free distance measuring method

Abstract

The invention belongs to the technical field of distance measurement and especially relates to a high precision switching free distance measuring instrument. The high precision switching free distance measuring instrument comprises a storage device, a control calculation device, first and second clock generation devices, a transmission driving device, a light emitting element driving device, a light emitting element which generates laser or infrared light beam, first and second half mirrors, a transmission device, a light quantity adjusting device, first and second large object lenses, a reflector, first and second receiving elements, first and second intermediate frequency amplifiers, a high voltage generating device, first and second AD sampling devices, and first and second double-head optical fibers. The invention adopts a high precision distance measurement device, the electric heterodyne frequency mixing technology is used, an internal and external optical path switching free measurement object emits the laser or infrared light beam and receives the reflection light from the measurement object to measure a distance, and the distance is calculated through obtaining the light receiving time difference of intermediate frequency pulse light. The high precision switching free distance measuring instrument has the advantages of stable distance measurement, high precision and no need of the mechanical switching of an optical path and is especially suitable for the distance measurement of a moving object.

Description

technical field [0001] The invention relates to a high-precision distance measuring device based on the electric heterodyne frequency mixing technology and the technology of exempting switching between internal and external optical paths. Background technique [0002] The principle of electronic distance measurement is the process of indirectly measuring the distance between two points by measuring the delay time of electromagnetic wave propagation between two points by using the characteristics of straight-line propagation and stable wave speed of electromagnetic waves. [0003] For a long time, due to the weakness of the simple pulse method principle of poor ranging accuracy, the phase method ranging principle has become the mainstream method of high-precision ranging devices. In the distance measuring device, a certain frequency carrier is used to modulate the laser or infrared beam, and the beam is used as the emitted light of the distance measuring device. The phase of...

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Problems solved by technology

[0010] In order to solve the above-mentioned problems, one of the purposes of the present invention is to adopt a front-end electrical heterodyne mixing device to solve high-frequency interference and noise problems, realize high precision and high stability of ranging; remove the gap between the ranging optical path and the internal reference optical path The mechanical switching device between them realizes high-speed distance measurement; the second purpose of this invention is to disclose a high-precision switching-free distance measurement method; the present invention is realized by adopting the following technical solutions

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