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Double frequency-sweeping light source ranging system and method based on cascaded interferometer

A technology of frequency-sweeping light source and ranging system, which is applied in the direction of instruments, measuring devices, and optical devices, can solve the problems of many photoelectric devices, high cost, and complex structure, and achieve large ranging range, high repeatability, and high accuracy. The effect of accuracy

Active Publication Date: 2019-08-16
宁波核芯光电科技有限公司
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Problems solved by technology

However, in this method, there are many photoelectric devices, complex structures, large devices, and high cost. The reference interferometer is easily affected by the external environment, which introduces measurement errors, and the system has requirements for the linearity of the frequency-sweeping light source.

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  • Double frequency-sweeping light source ranging system and method based on cascaded interferometer
  • Double frequency-sweeping light source ranging system and method based on cascaded interferometer
  • Double frequency-sweeping light source ranging system and method based on cascaded interferometer

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Embodiment Construction

[0018] Below in conjunction with specific embodiment, further illustrate the present invention. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0019] Embodiments of the present invention relate to a cascaded interferometer-based dual-sweep source ranging system, such as figure 1 As shown, it includes a first frequency-sweeping light source 1 and a second frequency-sweeping light source 2, the light emitted by the first frequency-sweeping light source 1 enters the first input end of the first optical coupler 4, and the second frequency-sweeping light source 2 The emit...

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Abstract

The invention relates to a double frequency-sweeping light source ranging system and method based on cascaded interferometer. Coherent light emitted by a first frequency-sweeping light source and a second frequency-sweeping light source enters an optical fiber coupler, and then respectively enters a main interferometer and a cascaded Mach-Zehnder interferometer after light-splitting; partial coherent light entering the main interferometer is first split through the optical fiber coupler, and a part reenters a common-path interferometer containing a sample through an optical fiber circulator, the returned sample interference spectrum signal and the other end output of the optical fiber coupler enter a balance detection device of the interference spectrum signal together so as to form an interference spectrum signal; and the interference spectrum signal and a reference interference signal formed in the cascaded Mach-Zehnder interferometer are synchronously collected; the light emitted bythe second frequency-scanning light source enters the optical fiber coupler, the other part of light after splitting enters a light source frequency detection unit, and a wavelength signal is synchronously collected. The accuracy and the reliability of the measurement can be improved.

Description

technical field [0001] The invention relates to the technical field of absolute distance measurement, in particular to a cascaded interferometer-based dual-sweep light source ranging system and method. Background technique [0002] With the development of high-end manufacturing, aerospace manufacturing, automobile manufacturing and unmanned driving and other fields, distance measurement is a particularly important aspect. Among the absolute distance dynamic measurement systems and methods currently used, the frequency-sweeping interferometry method has the advantages of large measurement range and high measurement accuracy. In order to improve the measurement accuracy of frequency-sweeping interferometry, many universities and research institutions at home and abroad have researched and reported on this method. Chinese Patent Publication No. CN106226775A, application publication date December 14, 2016, titled "A Dynamic Absolute Distance Measuring System and Measuring Metho...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02G01B9/02
CPCG01B9/02G01B9/02007G01B9/02015G01B11/02
Inventor 曹建建丁志华方旭马晓伟
Owner 宁波核芯光电科技有限公司
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