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Cylindrical torsion tuning optical fiber grating sensing demodulator

A technology of sensing demodulator and fiber grating, which is used in instruments, optics, nonlinear optics, etc., to achieve the effects of good cost performance, good market prospects, and large measurement range

Inactive Publication Date: 2005-05-04
SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] Due to the shortcomings of the above methods, the demodulation technology in the fiber grating sensing system has become one of the main obstacles to the popularization and application of this sensing technology.

Method used

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  • Cylindrical torsion tuning optical fiber grating sensing demodulator
  • Cylindrical torsion tuning optical fiber grating sensing demodulator
  • Cylindrical torsion tuning optical fiber grating sensing demodulator

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Embodiment Construction

[0026] see first figure 1 , as can be seen from the figure, the fiber grating cylindrical torsion tuning sensor demodulator of the present invention pastes a fiber grating 1 on the outer surface of the cylindrical rod 11 at a certain angle; one end of the cylindrical rod 11 is fixed on the clamp 12, This end of bar is kept still; The neck of the other end (moving end) of bar is installed in the bearing bracket 13 that rotates, and the head of cylinder bar 11 moving ends is equipped with a spanner connecting rod 14, and spanner connecting rod 14 and The motor is connected; then the fixture 12, the bearing bracket 13, the motor and other parts are assembled and fixed on the casing 6 to form a cylindrical torsion tuning fiber grating sensor demodulator.

[0027] Its working process and demodulation principle are simple and clear. When the motor rotates, one end of the wrench connecting rod 14 is driven to move up and down by the connecting rod (not shown in the figure), and the ...

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Abstract

A cylindrical torsion tuning optical fiber grating sensor demodulator is characterized in that its composition is: the fiber segment containing the optical fiber grating is pasted on the outer surface of a cylindrical rod at a certain angle, and one end of the cylindrical rod is fixed on the fixture On, keep this end of the cylindrical rod immobile, the neck of the other end of the cylindrical rod is installed in the bearing bracket that rotates, and the moving end of the cylindrical rod is horizontally equipped with a wrench connecting rod, and the wrench is connected The rod is connected with a motor to form a driving relationship, and the clamp, the bearing bracket and the motor are fixed on the casing. The invention has the advantages of simple structure, stable and reliable operation and convenient use.

Description

Technical field: [0001] The invention relates to a demodulator of an optical fiber grating sensor, in particular to a cylindrical torsion-tuned optical fiber grating sensor demodulator, which is mainly used in the technical fields of optical fiber sensing, optical measurement, and wavelength tuning of optical devices. Background technique: [0002] A fiber grating is an optical filter with narrow-band reflection characteristics fabricated on an optical fiber. Due to the elastic deformation and thermal expansion characteristics of silica fiber, as well as its thermo-optic and elastic-optic effects, it is sensitive to temperature and stress. Within a certain range, this sensitivity characteristic is linear and conforms to the following relationship: [0003] Δλ ε / λ=ε(1-γ) (1) [0004] Δλ T / λ=(α+e)ΔT (2) [0005] In the formula: ε is the strain of the fiber, γ is the elastic-optic coefficient of the fiber material, α is the thermal expansion coefficient of the fiber mate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/32G02F1/01
Inventor 方祖捷陈高庭瞿荣辉耿健新蔡海文
Owner SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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