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Few-mode fiber oblique raster-based vibration sensing system

A technology of vibration sensing system and inclined grating, which is applied in measuring devices, instruments, and measuring ultrasonic/sonic/infrasonic waves, etc., which can solve problems such as unfavorable installation and debugging, easy fracture of optical fiber, and complicated process

Inactive Publication Date: 2011-09-07
安徽省镭腾智能科技有限公司
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  • Application Information

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Problems solved by technology

The disadvantage of this solution is that two sections of optical fiber are biased and welded, the process is complicated, the loss is large, and the optical fiber is easy to break, which is not conducive to its installation and debugging in various occasions, and it is difficult to be practical

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  • Few-mode fiber oblique raster-based vibration sensing system
  • Few-mode fiber oblique raster-based vibration sensing system
  • Few-mode fiber oblique raster-based vibration sensing system

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Embodiment Construction

[0010] The specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. ( figure 1 As shown) according to an embodiment of the present invention: a few-mode fiber tilt grating vibration sensing system, including: a broadband light source (11), used to generate an optical signal with a certain spectral bandwidth; two 3dB fiber couplers, respectively 3dB bidirectional optical fiber Coupler (12) and 3dB beam-splitting fiber coupler (14), used for optical signal coupling and beam splitting; few-mode fiber tilt grating (13), used for reflection input fundamental mode LP 01 Optical signal and back coupling of fundamental mode optical signal into higher order mode LP 11 ; Two optical filters, respectively fundamental mode optical filter (15), realize fundamental mode LP 01 Optical signal band-pass filtering: high-order mode optical filter (17) to realize high-order mode LP 11 Optical signal bandpass filtering. Two ...

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Abstract

The invention discloses a few-mode fiber oblique raster-based vibration sensing system. The structure of the system comprises a broadband light source for generating certain spectrum width output, a few-mode fiber oblique raster for vibration sensing, a 3dB fiber coupler for splitting and coupling light signals, a base-mode optical filter for implementing base-mode LP01 light signal band-pass filter, a high-order mode optical filter for implementing high-order mode LP11 light signal band-pass filter, a photoelectric detector for converting the light signals into electrical signals, and a signal processing module. The system can implement flexural measurement on the few-mode fiber oblique raster by detecting and comparing the strengths of base-mode LP01 light signals and high-order mode LP11 light signals so as to realize the function of vibration sensing. The system has simple structure and high stability, is not sensitive to the temperature change, and is suitable for vibration measurement of various places.

Description

technical field [0001] The invention relates to optical fiber grating vibration sensing, in particular to a vibration sensing system based on few-mode optical fiber tilting gratings and a detection method thereof. Background technique [0002] The fiber grating is formed by germanium-doped optical fiber irradiated with ultraviolet light to form a grid. After the grid is formed, the refractive index of the fiber core presents a periodic distribution and produces a Bragg grating effect. When the temperature, stress, strain or other physical quantities of the environment where the fiber grating is located change, the period of the grating or the refractive index of the fiber core will change, so that the wavelength of the reflected light will change. By measuring the change of the wavelength of the reflected light before and after the physical quantity changes , the change of the physical quantity to be measured can be obtained. Fiber gratings are mostly used in distributed de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H9/00
Inventor 王安廷许立新江寅蒋祺顾春
Owner 安徽省镭腾智能科技有限公司
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