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Concatenation-type fiber bragg grating self-demodulation current sensor

A technology of current sensor and optical fiber grating, applied in the direction of measuring current/voltage, voltage/current isolation, instruments, etc., can solve the problems of the influence of the characteristics of optical fiber current sensor, etc., achieve simple structure, good safety, reduce cost and complexity Effect

Inactive Publication Date: 2010-07-21
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the characteristics of fiber optic current sensors based on interferometric detection methods are easily affected by the ambient temperature

Method used

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  • Concatenation-type fiber bragg grating self-demodulation current sensor
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  • Concatenation-type fiber bragg grating self-demodulation current sensor

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Embodiment Construction

[0017] A cascaded fiber grating self-demodulation current sensor proposed by the present invention includes an equal-strain cantilever beam gravity pendulum structure and a "cascaded" fiber grating self-demodulation technology, which is described as follows in conjunction with the accompanying drawings:

[0018] Fig. 1 is the system structure diagram of the cascaded fiber grating self-demodulation current sensor provided by the present invention, and the whole sensor system comprises a broadband light source 10, two fiber gratings 14 and 15, a cantilever beam unit, an optical fiber link and 2 × 2 optical fibers Coupler 12, optical fiber isolator 11, refractive index matching liquid 16, electromagnetic coil 21, photodetector 17, signal processing unit 18, electromagnetic drive unit 20, computer control system 19. The cantilever beam unit includes an isosceles triangular cantilever beam 13 of equal thickness and a permanent magnet 22 installed at the free end of the cantilever be...

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Abstract

The invention discloses a concatenation-type fiber bragg grating self-demodulation current sensor, comprising a broadband light source, an optoisolator, a 2*2 fiber optic coupler, a fiber bragg grating stuck on a cantilever beam, index matching fluid, a photoelectric detector, a signal processing unit, a computer control system, an electromagnetic driving unit and a magnet coil, wherein all components are connected by an optical fibre link; the signal processing unit is connected with the photoelectric detector, the computer control system is connected with the data processing unit, the electromagnetic driving unit and the magnet coil are connected with the computer control system, and a permanent magnet is fixed on the free end of the cantilever beam. The invention has the technical characteristics of adopting the cantilever beam type gravity pendulum structure and the 'concatenation-type' fiber bragg grating sensing self-demodulation technology. The invention only utilizes two fiber bragg gratings to realize both sensing and demodulation, thus greatly lowering the cost and the complexity of the demodulation system of a fiber bragg grating sensor. The concatenation-type fiber bragg grating self-demodulation current sensor can be applied to the fields, such as current and electromagnetic field measurement and the like.

Description

technical field [0001] The invention relates to a cascaded optical fiber grating self-demodulation current sensor, which belongs to the technical field of sensors and detection. Background technique [0002] At present, researchers and technicians at home and abroad have proposed many types of optical current sensors, and optical fiber current sensors are one of the important types. Optical fiber sensors based on different principles and design structures and their theoretical and experimental research results have also been reported. Such as (Y.W.Lee, I.Yoon, B.Lee, A simple fiber-optic current sensor using a long-period fiber grating inscribed on a polarization-maintaining fiber as a sensor demodulator, Sens.ActuatorsA 112, 2004) proposed based on fiber birefringence Effect, using polarization or interferometry system to detect the change of the polarization state of light along the optical fiber under the action of current to realize the sensor of current detection; (Y.P...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R15/14
Inventor 赵勇张馨元原博张硕
Owner NORTHEASTERN UNIV
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