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Multi-parameter optical fiber grating sensor for temperature, wind pressure and wind speed measurement

A fiber grating and wind speed measurement technology, which is applied in speed/acceleration/shock measurement, heat measurement, fluid pressure measurement using optical methods, etc., can solve the problems of large detection error, complex structure, high manufacturing cost, etc. Good performance, high measurement accuracy and simple structure

Inactive Publication Date: 2017-12-12
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention utilizes the special physical properties of fiber grating information materials such as small size, anti-electromagnetic interference, and long service life to realize real-time online monitoring of wind speed and direction in wind load alarm control units, with strong anti-interference and high accuracy. However, this invention also exists The problems of complex structure, high manufacturing cost and large detection error

Method used

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  • Multi-parameter optical fiber grating sensor for temperature, wind pressure and wind speed measurement
  • Multi-parameter optical fiber grating sensor for temperature, wind pressure and wind speed measurement
  • Multi-parameter optical fiber grating sensor for temperature, wind pressure and wind speed measurement

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Effect test

Embodiment 1

[0060] Such as figure 1 and figure 2 As shown, the multi-parameter fiber optic grating sensor used for temperature, wind pressure, and wind speed measurement includes an air induction pipe 1, an elastic sheet 3, an optical fiber grating A5 and an optical fiber grating B4; the air induction pipe 1 is provided with installation holes along the diameter direction 6. The elastic sheet 3 is fixedly arranged in the installation hole 6, and the center line of the elastic sheet 3 coincides with the diameter of the air induction pipe 1 where the installation hole 6 is located; the fiber grating A5 and optical fiber The grating B4 is symmetrically and fixedly arranged at the center of both sides of the elastic sheet 3, and the optical fiber 2 is connected to the fiber grating A5 and the fiber grating B4.

[0061] The air induction pipe 1 adopts a high-temperature resistant corundum tube with an inner diameter of 15 mm and an outer diameter of 20 mm. The elastic sheet 3 adopts a beryll...

Embodiment 2

[0083]Its difference with Embodiment 1 is that the parameter acquisition method for temperature, wind pressure, wind speed measurement multi-parameter fiber grating sensor comprises the following steps:

[0084] Step 1. When the multi-parameter fiber grating sensor is used for temperature, wind pressure and wind speed measurement, when the air flow blows the elastic sheet from one end of the fiber grating B, the fiber grating B produces tensile axial strain, and the center caused by the axial strain The wavelength change is f(ε)=(1-P e )λε, the wavelength variation caused by airflow temperature is f(t)=(a+ζ)λΔT, then the wavelength variation of fiber grating B Δλ B for:

[0085] Δλ B =f(ε)+f(t)=(1-P e )λε+(a+ζ)λ△T (7)

[0086] Among them, ε is the axial strain of the FBG, λ is the central wavelength of the FBG, a and ζ are the thermal expansion coefficient and thermo-optic coefficient of the fiber, respectively, P e is the effective elasto-optic coefficient of the fiber, ...

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Abstract

The invention discloses a multi-parameter optical fiber grating sensor for temperature, wind pressure and wind speed measurement. The multi-parameter optical fiber grating sensor comprises an induced air pipe, an elastic sheet, an optical fiber grating A and an optical fiber grating B; a mounting hole is formed in the induced air pipe along the diameter direction, the elastic sheet is arranged in the mounting hole, and the center line of the elastic sheet and the diameter of the induced air pipe in the mounting hole are overlaid; the optical fiber grating A and the optical fiber grating B are symmetrically arranged in the center positions of two side faces of the elastic sheet, and are connected to optical fibers. As the optical fiber grating A and the optical fiber grating B are symmetrically arranged on two side faces of the elastic sheet, when wind is blown into the induced air pipe, one of the optical fiber grating A and the optical fiber grating B is subjected to tensile strain while the other is subjected to compressive strain, and the strain values are equal, so that errors are separated by means of a sum and difference relationship in a variation formula of wavelengths of the optical fiber gratings, and the measuring sensitivity is increased while the measuring error caused by a system is reduced.

Description

technical field [0001] The invention relates to the field of optical fiber grating sensors, in particular to a multi-parameter optical fiber grating sensor for measuring temperature, wind pressure and wind speed. Background technique [0002] The measurement of wind pressure, wind speed and temperature is the basic guarantee for the research on ventilation and heat dissipation of motors, fans and other equipment, and it is of great significance to optimize the design of ventilation and heat dissipation and improve product performance. [0003] Optical fiber sensor is a type of sensor that is developing very rapidly at present, and is widely used in the measurement of various physical quantities such as temperature, pressure, and current. Fiber Bragg Grating sensors have the advantages of immunity to electromagnetic interference, chemical corrosion resistance, fatigue resistance, intrinsic explosion-proof, and adaptability to harsh environments. [0004] At present, FBG sens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K11/32G01L11/02G01P5/26G01K11/3206
CPCG01K11/32G01L11/025G01P5/26
Inventor 郭俊杰赵强蔡合超潘卫
Owner NANYANG INST OF TECH
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