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Real-time absolute ranging method and system based on single-chamber dual-femtosecond optical comb cross-correlation analysis

A distance measurement system and cross-correlation technology, applied in the field of real-time absolute distance measurement method and system, can solve the problems of restricting engineering practical value and actual promotion and application, and high system cost, so as to achieve enhanced stability, anti-interference ability and measurement accuracy High, fast update effect

Pending Publication Date: 2019-06-04
中国人民解放军火箭军工程大学
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Problems solved by technology

It can be seen that despite the outstanding advantages of the dual-comb ranging method, all the dual-comb absolute ranging methods at this stage are based on the generation of two relatively independent femtosecond optical combs. Its potential engineering practical value and practical popularization and application

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  • Real-time absolute ranging method and system based on single-chamber dual-femtosecond optical comb cross-correlation analysis
  • Real-time absolute ranging method and system based on single-chamber dual-femtosecond optical comb cross-correlation analysis
  • Real-time absolute ranging method and system based on single-chamber dual-femtosecond optical comb cross-correlation analysis

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[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] combine figure 1 As shown, the real-time absolute ranging method based on single-cavity double femtosecond optical comb cross-correlation analysis of the present invention, its steps are:

[0040] S1, femtosecond optical combs that generate two different repetition frequencies that are simultaneously output, and the two different repetition frequencies are f r1 with f r2 , and the repetition rate is locked to the atomic clock through frequency stabilization control; in an embodiment, it can be generated by a double femtosecond optical comb output light source based on a fiber ring single cavity;

[0041] S2. After the light beams of the two femtosecond optical combs pass through the interferometer optical path module, the orthogonal polarization components of the return light (reference light and measurement light) of the opt...

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Abstract

The invention discloses a real-time absolute ranging method and system based on single-chamber dual-femtosecond optical comb cross-correlation analysis. The method comprises steps: S1, two simultaneously-outputted femtosecond optical combs with different repetition frequencies are generated, the two different repetition frequencies are fr1 and fr2, and the repetition frequencies are locked to an atomic clock by frequency stabilization control; S2, after the beam of the two femtosecond optical combs passes through an interferometer optical path module, the orthogonal polarization components ofoptical comb pulse return light (reference light and measurement light) and local optical comb pulses are measured, and after combination, two groups of femtosecond laser pulse pairs with mutually-perpendicular polarization directions are generated; S3, two-path optical balance cross-correlation signals for reference and measurement are generated, and the signales can be generated by a femtosecondpulse cross-correlation analysis unit in the embodiment of the invention; and S4, the balance cross-correlation signals are subjected to high-speed digital signal analysis processing to obtain a ranging result. The system is the device used for executing the above method. The method and the system disclosed in the invention have the advantages of large ranging range, fast updating speed, high measuring precision and simple operation and the like.

Description

technical field [0001] The invention mainly relates to the technical field of laser precision distance measurement, in particular to a real-time absolute distance measurement method and system based on single-cavity double femtosecond optical comb cross-correlation analysis. Background technique [0002] Compared with other methods such as microwave ranging, laser ranging has the advantages of strong directivity, good monochromaticity, high sensitivity and resolution, and flexible ranging modes. It has been used in dimension measurement, positioning and installation, system calibration, and measurement Calibration and other aspects have been widely used, and it is the most accurate distance measurement method at present. With the development of large-scale equipment precision manufacturing and ultra-finishing technology, one of the bottlenecks in the development of advanced manufacturing has been transformed into seeking new breakthroughs in large-scale precision measurement...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/08
Inventor 王国超谭立龙谢建高钦和程洪杰李洪才唐圣金
Owner 中国人民解放军火箭军工程大学
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