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Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature

A technology of temperature sensor and optical fiber grating, which is applied in the field of bimetallic optical fiber grating temperature-enhancing sensor design, can solve the problem of limited range of high-sensitivity optical fiber grating temperature sensor

Inactive Publication Date: 2008-11-05
NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limited strain that the fiber grating can bear, the measuring range of the high-sensitivity fiber grating temperature sensor is limited

Method used

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  • Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature
  • Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature
  • Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature

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example 1

[0030] Example 1: In an environment of 20°C, make a sensor with an initial working temperature of 120°C. The sensor is mainly composed of the following parts: a fiber grating, aluminum with a large thermal expansion coefficient (α=22*10 -6 / K) base, small coefficient of thermal expansion invar (α=0.5*10 -6 / K) strip, where a strip hole, a set screw and a nut are made on the invar strip. according to figure 2 and image 3 In the way shown, first fix the aluminum base and the invar strip together with screws and nuts. Then use epoxy glue to paste the two ends of the fiber grating to the aluminum base and the end points of the invar strip respectively. Then, you can determine d by moving the invar bar, and choose different Δd according to different Ts.

[0031] Might as well set L=500mm, d=15mm. At this time, the pre-loose length of the fiber grating should be:

[0032] Δd=[α 2 L-α 1 (L-d)](Ts-Tr)≈1.05mm

[0033] The temperature sensitivity of the sensor is:

[0034] ...

example 2

[0036] Example 2: In an environment of 20°C, make a sensor with an initial working temperature of -80°C. The sensor is mainly composed of the following parts: a fiber grating, an invar base with a small thermal expansion coefficient, a long aluminum strip with a large thermal expansion coefficient, and a long hole, a fixing screw and a nut are made on the aluminum strip. according to figure 2 and image 3In the way shown, the invar base and the aluminum bar are first fixed together with screws and nuts. Then use epoxy glue to paste the two ends of the fiber grating to the invar base and the ends of the aluminum bar respectively. Then, d can be determined by moving the aluminum strip, and different Δd can be selected according to different Ts.

[0037] Might as well set L=500mm, d=15mm. At this time, the pre-loose length of the fiber grating should be:

[0038] Δd=[α 2 L-α 1 (L-d)](Ts-Tr)≈1.04mm,

[0039] The temperature sensitivity of the sensor is:

[0040] Δλ B / Δ...

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Abstract

The invention provides a manufacturing method of a high-sensitivity optical fiber grating temperature sensor working in the high temperature and the low temperature, wherein the sensor adopts the duplex metal structure, and the temperature for the sensor to work is adjusted through adjusting the pre-loose length of the optical fiber grating. The method solves the problems that the high-sensitivity optical fiber grating temperature sensor can not work in the high and low temperature, and has wide application foreground in the temperature measuring field.

Description

1. Technical field [0001] The invention relates to an optical fiber sensor, in particular to a design method and a manufacturing process of a double-metal optical fiber grating temperature-increasing sensor. 2. Technical background [0002] Fiber Bragg Grating has many advantages that other sensors can't match: all-optical measurement, no electrical equipment at the monitoring site, free from electromagnetic and nuclear radiation interference; zero drift, long-term stability; the center wavelength of reflected light is used to characterize the measured object, not affected by the light source Influenced by factors such as power fluctuations, fiber microbending effects, and coupling loss; absolute measurement, no calibration required during system installation and long-term use; long service life, etc. [0003] Fiber Bragg grating is a spatial phase grating formed in the core of a single-mode fiber by using the photosensitivity of the fiber material, that is, the interaction ...

Claims

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Application Information

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IPC IPC(8): G01K11/32G02B6/02G01K11/3206
CPCG01D5/353G01K11/3206G02B6/02204G01D5/35316
Inventor 李阔周振安叶晓平刘爱春王永根
Owner NAT INST OF NATURAL HAZARDS MINISTRY OF EMERGENCY MANAGEMENT OF CHINA
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