High-resolution optical fiber strain sensor and measuring method

A fiber optic strain and high-resolution technology, applied in measuring devices, instruments, optical devices, etc., can solve problems such as low resolution and slow response speed, achieve high response rate, ensure reliable operation, and high strain resolution Effect

Active Publication Date: 2015-08-12
UNIV OF SCI & TECH OF CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a high-resolution optical fiber strain sensor and measurement method, which can solve the problem of low resolution of traditional optical fiber strain sensors, and overcome the slow response speed of sensors based on vortex beams in rapidly changing environments. shortcoming

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  • High-resolution optical fiber strain sensor and measuring method
  • High-resolution optical fiber strain sensor and measuring method

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Embodiment Construction

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0032] The strain sensor described in the embodiment of the present invention is based on the Mach-Zehnder interferometer structure. The vortex beam generated by the reference arm and the fundamental mode Gaussian beam generated by the sensing arm are interfered to form helical interference fringes. The strain will cause the rotation of the helical interferogram, which is then recorded by a high-speed linear array CCD camera, and the strain can be measured after ...

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Abstract

The invention discloses a high-resolution optical fiber strain sensor and a measuring method. The measuring method comprises: firstly output light of a narrowband light source is transmitted to a light beam splitter; the light beam splitter splits the light according to an energy ratio of 1:1, and one output light beam is transmitted to a vortex light converter as a reference arm while the other output light beam is transmitted to a sensing light path as a sensing arm; the interference of light beams output by the reference arm and the sensing arm is completed by a light beam combiner; an interfered pattern is acquired by a linear array CCD camera and is transmitted to a processing terminal for digital image processing by which strain variation information is obtained through demodulating the interfered pattern. The optical fiber strain sensor has an extremely high strain resolution, and has an extremely high response speed due to the use of the linear array CCD camera, so that the reliable operation of the system is ensured even under the condition of very high strain variation.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to a high-resolution optical fiber strain sensor and a measuring method. Background technique [0002] Strain sensing is widely used in the field of geology and large-scale engineering detection, and in some occasions there is a high requirement for the resolution of strain sensing (for example, the prediction of earthquake precursors requires a resolution higher than 10 -9 order of magnitude). At present, strain measurement is mostly realized by electrical sensors, which have the advantages of low cost and better resolution, but due to the defects of zero drift, easy to be disturbed by electromagnetic environment, and small dynamic range, the application development has been restricted. The strain sensor based on optical fiber technology can not only overcome the shortcomings of traditional electrical strain sensors, but also facilitate the monitoring of networking a...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/16
Inventor 陈林勋朱冰杨利
Owner UNIV OF SCI & TECH OF CHINA
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