A Distributed Optical Fiber Curvature Sensor

A curvature sensor and distributed optical fiber technology, applied in the field of sensors, can solve the problems of inability to measure continuously, less locations for curvature measurement, restricting the application range, etc., to achieve improved range and adaptability, small mode capacity, and avoid inter-mode crosstalk Effect

Active Publication Date: 2018-11-09
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
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Problems solved by technology

[0004] The invention provides a distributed optical fiber curvature sensor, which solves the technical problem in the prior art that there are few positions for curvature measurement and continuous measurement is impossible, which seriously restricts the scope of application.

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  • A Distributed Optical Fiber Curvature Sensor
  • A Distributed Optical Fiber Curvature Sensor

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Embodiment Construction

[0038] The embodiment of the present application provides a distributed optical fiber curvature sensor to solve the technical problem that the curvature measurement position in the prior art is small and cannot be continuously measured, which seriously restricts the scope of application. The measurement becomes possible, which makes the fiber optic curvature sensor have a wider application scenario.

[0039] In order to solve the above technical problems, the general idea of ​​the technical solution provided by the embodiment of the present application is as follows:

[0040] A distributed optical fiber curvature sensor, comprising: a frequency modulation unit, a pulse modulation unit, a sensing fiber, a light source, and an optical signal processing unit;

[0041] The light source is respectively connected with the frequency modulation unit and the power adjustment unit to output optical signals;

[0042] The frequency modulation unit is connected to the first end of the sen...

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Abstract

The invention belongs to the technical field of sensors, and discloses a distributed fiber curvature sensor. The sensor comprises a frequency modulation unit, a pulse modulation unit, a sensing fiber, a light source, and an optical signal processing unit. The light source is connected with the frequency modulation unit and the pulse modulation unit, and outputs an optical signal. The frequency modulation unit is connected with a first end of the sensing fiber, and transmits the optical signal after frequency modulation. The pulse modulation unit is connected with a second end of the sensing fiber, and transmits an optical pulse signal to the sensing fiber. The optical signal processing unit is connected with the sensing fiber, receives the optical signal outputted by the sensing fiber, and obtains a Brillouin frequency shift through analysis. The sensing fiber is a few-mode fiber, and the modes of the few-mode fiber comprise 2-5 modes. The sensor achieves the continuous measurement of curvature, and carries out the high-precision and targeted measurement of curvature changes.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a distributed optical fiber curvature sensor. Background technique [0002] At present, the basic principle of the optical fiber-based curvature sensor is mainly to measure the intensity or phase change of the transmitted light in the optical fiber caused by the bending of the optical fiber, so as to calculate the bending condition of the optical fiber. [0003] The basic technical principles mainly include: long-period fiber grating technology, fiber Bragg grating technology, fiber Sagnac ring technology, Mach-Zehnder interference technology and fiber directional coupling technology. However, the curvature of optical fibers designed based on the above technologies are single-point or multi-point, which cannot realize continuous measurement of the curvature of the entire optical fiber, which limits its application scenarios. Contents of the invention [0004] The invention pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B11/24G01B11/16
CPCG01B11/16G01B11/24
Inventor 唐明吴昊汪若虚付松年韦会峰童维军
Owner HUAZHONG UNIV OF SCI & TECH
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