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Air Refractive Index Compensation Method for Laser Tracking Measurement System Based on Dual-Wavelength Interference

A dual-wavelength interference and laser tracking technology is applied in radio wave measurement systems, measurement devices, and the use of re-radiation. It can solve the problems of cumbersome arrangement of multiple environmental parameter sensors and the inability to ensure uniform distribution of air parameters. It achieves simple structure, Avoid cumbersome layout and wide application effect

Active Publication Date: 2020-03-13
BEIJING UNIV OF TECH
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Problems solved by technology

For the laser tracking measurement system, the indirect method cannot ensure that the air parameters are evenly distributed on the laser propagation path, and it is cumbersome to arrange multiple environmental parameter sensors. Refractive index for real-time compensation

Method used

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  • Air Refractive Index Compensation Method for Laser Tracking Measurement System Based on Dual-Wavelength Interference
  • Air Refractive Index Compensation Method for Laser Tracking Measurement System Based on Dual-Wavelength Interference
  • Air Refractive Index Compensation Method for Laser Tracking Measurement System Based on Dual-Wavelength Interference

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like figure 1 As shown, the output wavelength of single-frequency laser L1 and single-frequency laser L2 is λ 1 and lambda 2 The two lines of polarized light are adjusted by the analyzer P1 and the analyzer P2 respectively, so that the polarization direction is 45° to the optical axis. The wavelength is λ 1 After the linearly polarized light is reflected by the mirror R1, the wavelength is λ 2 The linearly polarized light converges at the beam splitter BS1 and separates them respectively, with a wavelength of λ 1 The transmitted light and the wavelength of the laser are λ 2 The reflected light of the laser is used as the reference light, and the wavelength is λ 1 The reflected light of the laser has a wavelength of λ 2 The transmitted light of the laser is used as the measurement light. The reference light is reflected by the mirror R3 and split by the b...

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Abstract

The invention discloses an air refractive index compensation method for a laser tracking measurement system based on dual-wavelength interference. The method comprises the steps: employing two light sources; enabling a laser to output two light beams with different wavelengths, and enabling the two light beams to pass through a polarization analyzer and to be split by the same light splitter, wherein one part serves as measurement light and is emitted to a system tracking measurement part light path formed by the light splitter, a polarization light splitter, a cat eye, a standard ball and a displacement detector, and the other part serves as reference light, and is reflected by a reflector to form respective interference signals at the light splitter. The method combines a method for compensating for an air refractive index through dual-wavelength interference with a laser tracking measurement system, introduces a dispersion coefficient A for determining a to-be-measured distance L during distance calculation, avoids the measurement inconvenience of the air refractive index on a laser transmission full path, and achieves the self-compensating of the air refractive index in a measurement process.

Description

technical field [0001] The invention relates to a method for compensating the air refraction index of a laser tracking measurement system, in particular to a method for real-time compensation of the air refraction index of the entire path of the laser tracking interferometry system based on dual-wavelength interference. Background technique [0002] The laser tracking measurement system is a high-precision portable three-dimensional coordinate measurement system, which is used for precise measurement of spatial geometric quantities and dynamic trajectory measurement. In the ideal measurement model, the system uses the ideal wavelength in vacuum as the measurement reference, but in most cases it is measured in air rather than in vacuum, and the measurement reference is the actual wavelength of the laser in the air. At this time, the laser wavelength It is determined by the vacuum wavelength of the laser and the refractive index of air, so it is necessary to compensate the ref...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01S11/12G01B11/00
CPCG01B11/005G01S11/12
Inventor 石照耀戴成睿陈洪芳汤亮
Owner BEIJING UNIV OF TECH
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