Soft packaging optical fiber grating sensor with vernier wavelength

Abstract

This invention relates to an optical fiber and grating sensor with adjustable wavelength and one optical section with light fiber and grating, which are characterized by that the optical fiber goes through the protection cover tube, first clamper middle hole and second clamper middle hole. The said protective cover tube both ends are separately stuck to first and second clampers with soft glue and adhesive agent and stretches the optical section with optical fiber and grating and ensures the optical fiber and grating at the right middle of the protection cover tube. This invention fills the two holes with fix glue stuck to first and second clampers to form one body to make the optical fiber and grating sensor. The said first and second clampers outside screw are located with micro-adjust screw cap. íí

Description

technical field [0001] The invention relates to a sensor, in particular to a soft package optical fiber grating sensor with finely adjustable wavelength. It is mainly used in the sensing and detection of strain and temperature in construction engineering and other structural parts. 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, thermal expansion characteristics and thermo-optic and elastic-optic effects of silica fiber, 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 material, ΔT is the temperature change, e ...

AI Technical Summary

Problems solved by technology

People usually paste it on a capillary or a sheet to make a sensing element. Although this can solve the above problems to a certain extent, the difficulty of layout has not been fundamentally changed.

Moreover, this kind of sensing element is restricted by glue, capillary or thin film, and is greatly affected by the packaging process. It must be calibrated one by one, and the linearity becomes worse, and the range of sensing measurement is reduced; wavelength tuning is also difficult. , which is not conducive to the application of wavelength division multiplexing technology, and is not conducive to large-area multi-point measurement, which has brought considerable constraints to practical applications.

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