Optical fiber grating detection device and method for measuring pressure and temperature parameters

A fiber grating and detection device technology, which is applied in the measurement device, the measurement force, the measurement of the force by measuring the change of the optical properties of the material when it is stressed, etc. The problem of high cost, to achieve the effect of easy operation, high sensitivity and accurate measurement results

Active Publication Date: 2019-12-03
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It involves the use of reference fiber grating methods, etc., due to the large size of the designed sensor and the inability to measure the contact temperature, it lacks practical application value
[0005] T

Method used

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  • Optical fiber grating detection device and method for measuring pressure and temperature parameters
  • Optical fiber grating detection device and method for measuring pressure and temperature parameters
  • Optical fiber grating detection device and method for measuring pressure and temperature parameters

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Effect test

Embodiment 1

[0035] Such as figure 1 with figure 2 As shown, the present invention is a fiber grating detection device for measuring pressure and temperature dual parameters, including an optical fiber, a primary sensitive element and a secondary sensitive element;

[0036] The primary sensitive element is a pair of cantilever beams with equal thickness and equal strength, and the double cantilever beams with equal thickness and equal strength include a bimetal temperature-sensitizing area and a pressure-measuring optical fiber bearing area;

[0037] The optical fiber is arranged on a cantilever beam of double equal thickness and equal strength;

[0038] The secondary sensitive element is provided with two sections of fiber Bragg gratings with different grating intervals axially apart from a predetermined distance on the optical fiber; wherein the first Bragg grating 7 is fixed on the bimetallic temperature-intensifying region, and the The second Bragg grating 6 is fixed on the bearing ...

Embodiment 2

[0047] Such as Figure 1 to Figure 4 As shown, a fiber grating detection device for measuring dual parameters of pressure and temperature consists of the following parts: an optical fiber, a long plate 1 , a short plate 2 and two bolts 5 . The two boards are shaped like figure 1 with figure 2 As shown, the narrowest and shortest upper fixed bimetallic temperature-sensitizing area on the long plate 1, and the bearing area of ​​the pressure-measuring optical fiber is the center position of the double equal-thickness and equal-strength cantilever beam, that is, the junction of the structural thickness changes of the long plate and the short plate. The optical fiber used has two sections of fiber gratings with different grating pitches. The first Bragg grating 7 is fixed on the bimetal temperature-increasing area, and the second Bragg grating 6 is fixed on the bearing area of ​​the pressure-measuring optical fiber.

[0048] The principle is that two fiber Bragg gratings with di...

Embodiment 3

[0057] The invention also discloses a detection method of an optical fiber grating detection device for measuring double parameters of pressure and temperature, including:

[0058] By setting the thermal expansion coefficient of the bimetal on the bimetal temperature-intensifying area, the first Bragg grating 7 measures different temperature ranges;

[0059] The relationship between the wavelength difference and pressure and temperature is obtained through double equal thickness and equal strength cantilever beams, the influence of contact temperature on the wavelength is eliminated, and the pressure and ambient temperature are measured through the second Bragg grating 6 .

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Abstract

The invention discloses an optical fiber grating detection device and method for measuring pressure and temperature parameters. The device comprises an optical fiber, a primary sensitive element and asecondary sensitive element; the primary sensitive element is a double-equal-thickness equal-strength cantilever beam, wherein the double-equal-thickness equal-strength cantilever beam comprises a bimetallic temperature sensitization enhancement area and a pressure measurement optical fiber bearing area; the optical fiber is arranged on the double-equal-thickness equal-strength cantilever beam; the secondary sensitive element is two sections of optical fiber bragg gratings with different grating distances which are axially separated by a predetermined distance on the optical fiber, wherein the first bragg grating is fixed on the bimetallic temperature sensitization enhancement area, and the second bragg grating is fixed on the pressure measurement optical fiber bearing area; and the wavelengths of the first bragg grating and the second bragg grating are different, and certain wavelength difference is formed. The optical fiber sensor is low in cost, stable and reliable in work, and capable of accurately detecting the contact temperature, the pressure and the environment temperature.

Description

technical field [0001] The invention relates to the technical field of optical fiber sensing, in particular to an optical fiber grating detection device and method for measuring dual parameters of pressure and temperature. Background technique [0002] Fiber Bragg Grating (FBG) sensors have unique characteristics such as anti-electromagnetic interference and long-distance transmission. The measurement of various physical quantities such as pressure and temperature can be realized by using fiber grating sensors. It has great application value in the fields of composite material structure condition monitoring, aerospace, robot and so on. [0003] Aiming at the cross-sensitivity problem of pressure and temperature of fiber gratings, the traditional solution, the dual-wavelength matrix method, has the problem of requiring two spectrum analyzers and broadband light sources, which is limited in practical application. [0004] In order to solve the above-mentioned cross-sensitivi...

Claims

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Application Information

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IPC IPC(8): G01K11/32G01L1/24
CPCG01K11/3206G01L1/246
Inventor 张小栋王雅纯张毅蒋志明陆竹风
Owner XI AN JIAOTONG UNIV
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