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Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method

A technology of absolute distance and measuring device, which is applied in the field of two-color laser scanning absolute distance measuring device, can solve the problem that the measuring optical path cannot block the optical path, etc., and achieves the effect of simple system structure and improved measuring accuracy.

Inactive Publication Date: 2013-10-23
TSINGHUA UNIV
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Problems solved by technology

The incremental measurement method has the characteristics of high measurement accuracy, large measurement range and fast measurement speed, but the distance change of the measurement optical path depends on the high-precision displacement guide rail to achieve, and the optical path cannot be blocked during the measurement process

Method used

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  • Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method
  • Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method
  • Optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and method

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Embodiment Construction

[0033] The implementation of the present invention will be described in detail below in conjunction with the drawings and examples.

[0034] Such as figure 1 As shown, a two-color laser scanning absolute distance measuring device based on optical frequency comb calibration includes a laser light source system 1 , a polarization maintaining fiber system 2 , a Michelson interference system 3 and a laser frequency calibration system 4 .

[0035] Wherein, the laser light source system 1 includes a first tunable laser 10 , a second tunable laser 11 and a femtosecond optical frequency comb 12 . The first tunable laser 10 and the second tunable laser 11 are used to output single frequency and single linearly polarized laser. In this embodiment, the output wavelength of the first tunable laser 10 is about 780 nm, and the output wavelength of the second tunable laser 11 is about 1550 nm, both of which are external cavity semiconductor lasers. Among them, by changing its operating cur...

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Abstract

An optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and a method are characterized in that the device comprises a laser light source system, a polarization-maintaining optical fiber system, a Michelson interference system and a laser frequency calibration system. The method comprises the steps of controlling two tunable lasers in the laser light source system to continuously simultaneously adjust the output light frequency without mode skips, wherein the laser frequency calibration system records the interference signal of the Michelson interference system and a beat frequency signal of the tunable lasers and the optical frequency comb; computing the scanning range of the lasers and the period integer and period decimal of the phase change of the interference signal in the scanning process according to the collected data; and finally computing to obtain the absolute distance of a to-be-measured light path refractive face. The optical frequency comb calibration-based dual-color laser scanning absolute distance measuring device and the method have the advantages of simple system structure, high measuring precision, compensating effect on air refractive index, and traceable measuring outcome, and are suitable for the measuring field of space absolute distance.

Description

technical field [0001] The invention relates to a two-color laser scanning absolute distance measurement device and method based on optical frequency comb calibration. Background technique [0002] Laser interferometric distance measurement technology obtains the distance difference between the measurement optical path and the reference optical path by measuring the interference phase of the reference optical path and the measurement optical path and according to the corresponding relationship between the interference phase and the optical path difference. [0003] According to the detection phase, laser interferometric distance measurement can be divided into two categories: incremental measurement method and absolute distance measurement method. The incremental measurement method fixes the optical path of the reference optical path, continuously adjusts the optical path of the measurement optical path, detects the change of the interference phase of the two optical signals...

Claims

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Application Information

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IPC IPC(8): G01S11/12
Inventor 杨宏雷李岩吴学健任利兵张弘元尉昊赟
Owner TSINGHUA UNIV
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