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High-precision laser range unit and measurement method

A laser ranging and high-precision technology, applied in the field of optical detection, can solve problems such as low phase detection accuracy, achieve the effects of improving measurement accuracy, solving complex optical paths, and simplifying measurement devices

Active Publication Date: 2016-06-22
INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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Problems solved by technology

[0004] In view of this, the object of the present invention is to propose a high-precision laser ranging device and measurement method to solve the problem of low phase discrimination accuracy in the traditional phase ranging method, thereby improving the measurement accuracy and the stability of the measurement system

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  • High-precision laser range unit and measurement method

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specific Embodiment

[0064] Specific examples: such as figure 1 In the structure shown, the light source is a linearly polarized laser with a wavelength of 1550nm, and the polarization ratio is 500:1. The optical fiber splitter 3 is an energy type optical fiber splitter with a splitting ratio of 1:20, and the optical fiber splitter 4 is a polarization type splitter to separate S light and P light respectively. The polarization modulator 6 is a polarization switch with a bandwidth of DC-12GHz and a half-wave voltage of 7V. The first photodetector 10 and the second photodetector 11 are InGaAs PIN photosensitive diodes with a detection frequency of 40 GHz and a rise time of 7 ps.

[0065] Turn on the laser 1 and the polarization modulator 6, and make the square-wave frequency-sweeping signal source 7 generate a continuous frequency-sweeping square-wave signal with a signal amplitude of 7V. Read the output signals of the first photodetector 10 and the second photodetector 11 respectively, and find o...

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Abstract

The invention discloses a high-precision laser range unit and measurement method. The high-precision laser range unit includes a laser, an optical fiber isolator, an optical fiber light splitter, an optical fiber polarized light splitter, a polarization modulator, a square wave sweep frequency signal source, an optical fiber coupler and a reflector. According to the invention, a problem that the range precision is difficult to improve due to low phase discrimination precision in a traditional phase telemetry method is solved and problems of complex optical paths, comparatively small modulation band width and limited range field in spatial light polarization modulation range are also solved. According to the invention, the measurement device is simplified and the measurement precision and the stability of a measurement system are improved.

Description

technical field [0001] The invention relates to the technical field of optical detection, in particular to a high-frequency polarization modulation ranging device and measurement method based on optical fiber optical path waveguide modulation. Background technique [0002] Absolute precision ranging in large-scale space is an important key technology in my country's large-scale equipment manufacturing. Traditional absolute distance measurement methods include pulse time-of-flight method, phase ranging method, multi-wavelength interferometry, frequency modulation continuous wave measurement method and so on. However, the measurement accuracy of the pulse time-of-flight method and the phase ranging method cannot meet the accuracy requirements of precision ranging; the multi-wavelength interferometry and frequency modulation continuous wave ranging method have high requirements for the stability of the measurement light, and the poor anti-interference performance cannot meet I...

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Application Information

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IPC IPC(8): G01S17/08G01S7/481
CPCG01S7/481G01S17/08
Inventor 纪荣祎高书苑周维虎董登峰劳达宝张滋黎袁江石俊凯刘鑫王国名王岩庆程智
Owner INST OF MICROELECTRONICS CHINESE ACAD OF SCI
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