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Air disturbance compensating laser collimation and displacement measurement system based on holographic conjugate light

A laser collimation and laser technology, applied in the field of precision measurement, can solve problems such as limiting the application of interferometric length measurement

Active Publication Date: 2017-05-31
李达成
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for large-scale measurement, especially under field working conditions, these compensation methods can only partially compensate, which greatly limits the application of interferometric length measurement

Method used

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  • Air disturbance compensating laser collimation and displacement measurement system based on holographic conjugate light
  • Air disturbance compensating laser collimation and displacement measurement system based on holographic conjugate light
  • Air disturbance compensating laser collimation and displacement measurement system based on holographic conjugate light

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Embodiment Construction

[0070] The laser alignment system and displacement measurement system provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0071] For the convenience of description and understanding, the present invention firstly explains the principle of conjugate light.

[0072] (1) The way of light propagation:

[0073] E(r,t)=E(r)cos(wt-kz)=E(r)exp{-i(wt-kz)};

[0074] Where E(r) is the complex amplitude and is the phase amplitude vector, that is, the value that simultaneously represents the phase and amplitude of light.

[0075]

[0076] λ is the wavelength of light, z is the distance in the direction of light propagation, and the complex amplitude E(r) contains all the information of the light wave in the spatial structure, which is:

[0077]

[0078] Here a(r) represents the amplitude of the light, Indicates the phase of light.

[0079] (2) Phase conjugate light of light:

[0080] Ec(r,t)=E * (r)exp{-i(wt-kz);...

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Abstract

The invention relates to a laser collimation system. The laser collimation system comprises a laser output unit which is used for outputting laser, a first beam splitter mirror which is used for reflecting and transmitting laser output by the laser output unit to form a first reflected light and a first transmitted light, a second beam splitter mirror which is used for further splitting the first transmitted light to again form a second reflected light and a second transmitted light which is information light coming into a target to be measured to collect the phase information, a conjugate light generating component which is arranged on a propagation optical path from the first reflected light and is used for outputting the conjugate light of the information light as measurement light, and a photodetector which is arranged on the optical path of the measurement light reflected by the second beam splitter mirror, and is used for detecting the measurement light reflected by a second mirror and converting the measurement light into an electrical signal. The invention further provides a displacement measurement system. According to the invention, the laser collimation system and the displacement measurement system can effectively reduce the influence of air disturbance.

Description

technical field [0001] The invention relates to a laser alignment system and a displacement measurement system, in particular to a laser alignment system and an interference displacement measurement system based on holographic conjugate light compensation for air disturbance, belonging to the field of precision measurement. Background technique [0002] Due to its good directionality, the laser is used for collimation measurement as soon as it appears, but due to the beam drift caused by the laser, especially the air disturbance during the beam propagation process, the emitted beam cannot form a stable straight line, which greatly affects Collimation accuracy. At present, there are methods to solve the beam drift, but there is still no complete solution to the impact of air disturbance, which greatly affects the accuracy of laser alignment measurement, especially for large-scale alignment measurements at the work site. For example, the assembly of large machinery and applic...

Claims

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Application Information

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IPC IPC(8): G01B11/02G01B9/027G01B9/02
CPCG01B9/02055G01B9/02062G01B9/027G01B11/02G01B2290/70
Inventor 李达成
Owner 李达成
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