CN201488837U - Fiber grating sensor measuring temperature and strain simultaneously - Google Patents
Fiber grating sensor measuring temperature and strain simultaneously Download PDFInfo
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- CN201488837U CN201488837U CN2009201728788U CN200920172878U CN201488837U CN 201488837 U CN201488837 U CN 201488837U CN 2009201728788 U CN2009201728788 U CN 2009201728788U CN 200920172878 U CN200920172878 U CN 200920172878U CN 201488837 U CN201488837 U CN 201488837U
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Abstract
The utility model provides a fiber grating sensor measuring temperature and strain simultaneously, which comprises two gratings, a wide bar, a narrow bar and a pole, wherein the two bars are fixed on the pole. One grating is fixed between the two bars, and the other grating is fixed between the pole and the wide bar. When the strain to be measured is changed, the return wavelength of the grating between the two bars is changed correspondingly; and when the temperature is changed, the return wavelengths of the two gratings are both changed correspondingly, so the temperature change and the strain change of the environment can be obtained via data processing. The sensor has simple structure and is used conveniently.
Description
One, technical field
The utility model relates to Fibre Optical Sensor, especially fiber-optical grating temperature sensor and fiber Bragg grating strain sensor.
Two, technical background
Fiber grating has the incomparable advantage of many other sensors as novel sensing element: full photo measure at the on-the-spot no electrical equipment of monitoring, is not disturbed by electromagnetism and nuclear radiation; Measured with catoptrical centre wavelength sign, be not subjected to the influence of factors such as light source power fluctuation, optical fiber micro-bending effect and coupling loss; Absolute magnitude is measured, long service life or the like.
Fiber grating is a photosensitivity of utilizing fiber optic materials, be that extraneous incident photon and fibre core interact and cause the permanent change of latter's refractive index, with the space phase grating that the Ultra-Violet Laser method of writing direct forms, its essence is the light filter or the catoptron that in fibre core, form an arrowband in the fibre core of single-mode fiber.Fiber grating belongs to the reflection-type device work, when the continuous wide band light that sends when light source is injected by Transmission Fibers, and it and grating generation coupling, this broadband light of grating pair is the corresponding narrow band light of reflected back selectively, and returns along former Transmission Fibers; The then direct transmissive of all the other broadband light.The centre wavelength value of the narrow band light of reflected back (also being the Bragg wavelength) is:
λ
B＝2n
effΛ
In the following formula, n
EffBe the effective reflection coefficient of FBG, Λ is the geometric distance between adjacent two barriers of FBG.
The grating that temperature and strain variation cause returns wavelength variable quantity:
Δλ
B＝λ
B(1-P
e)Δε
FBG+λ
B*ξ*ΔT (1)
Wherein, P
e(≈ 0.22) is the bullet light constant of grating, and ξ is the thermo-optical coeffecient of grating, Δ ε
FBGBe the strain variation of grating, Δ T is the variation of ambient temperature amount.
Fiber Bragg grating strain sensor is widely-used in industries such as bridge, buildings.Because fiber grating is responsive simultaneously to temperature and strain, when measuring strain, be necessary to know the temperature variations of environment.
Three, utility model content
The utility model provides a kind of temperature, the simultaneously-measured fiber-optic grating sensor of strain, comprise two gratings, a wide rod, a narrow rod and a bar composition, on described bar, fix described two rods, one in the described grating is fixed between described two rods, and another root in the described grating is fixed between described bar and the described wide rod.
During on-the-spot the installation, earlier two rods are fixed to the object of strain to be measured.Then, unstick and narrow rod is fixing.Like this, when strain to be measured changed, the wavelength that returns of the grating between two rods changed with regard to corresponding; When temperature changes be, two gratings return all respective change of wavelength.Therefore, by data processing, just can draw the temperature variation and the strain variation of environment.This sensor construction is simple, and is easy to use.
Four, description of drawings
Accompanying drawing 1 is that two rod is fixed to the front section view on the bar.
Accompanying drawing 2 is that two rod is fixed to the bottom view on the bar.
Accompanying drawing 3 is structural representations of fixed fiber grating.
Accompanying drawing 4 is the structural representations that add screw on strain object to be measured.
Accompanying drawing 5 is the structural representations after the sensor installation.
Wherein, 1 is wide rod, and 2 is narrow rod, and 3 is bar, and 4 are and the screw hole of strain object to be measured coupling, and 5 is grating, and 6 is strain object to be measured, and 7 for being fixed on the screw on the strain object to be measured.
Five, specific embodiments
Below in conjunction with for example the utility model being done more detailed description:
This sensing rises mainly to be formed with the lower part: two gratings, a wide rod, a narrow rod and a bar are formed.The shape of two rods and bar as shown in Figures 1 and 2, the bottom of bar has the square of a projection, and a screw hole with strain object to be measured coupling is all arranged on two rods.On bar, fix two rods.A grating is fixed between two rods, and another root grating is fixed between bar and the wide rod.During fixed grating, between measurement zone, its pre-loose length or pre-stretching strain are set according to the design needs.
During on-the-spot the installation, on the object of strain to be measured, fix two screw bases, as shown in Figure 4 by welding, mode such as gluing.Then sensor is fixed to strain object to be measured, the point of fixity of unstick and narrow rod is finished installation, as shown in Figure 5.
Fixing of grating, modes such as back welding can stick with glue, metallize; Fixing between rod and the bar, between rod and the strain object to be measured can be used screw, mode such as gluing; The pre-loose length of fiber grating and the method for pre-stretching strain are set can adopt structures such as cylindrical void, stretching platform to realize.
Thermal expansivity by two rods are set and grating length therebetween can be realized the strain measurement of auto thermal compensation, shown in patent 200810104456.7.Length by wide rod and bar are set, thermal expansivity and grating length therebetween can be realized the measurement of different temperatures sensitivity.
For sensor is protected, can by add protective cover, dwindle two between the rod distance and on rod, open in mode such as caulking groove.
Claims (1)
1. a temperature, the simultaneously-measured fiber-optic grating sensor of strain, comprise two gratings, a wide rod, a narrow rod and a bar composition, it is characterized in that: on described bar, fix described two rods, one in the described grating is fixed between described two rods, and another root in the described grating is fixed between described bar and the described wide rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201728788U CN201488837U (en) | 2009-08-19 | 2009-08-19 | Fiber grating sensor measuring temperature and strain simultaneously |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201728788U CN201488837U (en) | 2009-08-19 | 2009-08-19 | Fiber grating sensor measuring temperature and strain simultaneously |
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| CN201488837U true CN201488837U (en) | 2010-05-26 |
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| CN2009201728788U Expired - Fee Related CN201488837U (en) | 2009-08-19 | 2009-08-19 | Fiber grating sensor measuring temperature and strain simultaneously |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101306A (en) * | 2014-07-24 | 2014-10-15 | 河海大学 | Fiber bragg grating temperature compensation method and ultrathin miniature rebar strainometer |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN111811408A (en) * | 2020-07-06 | 2020-10-23 | 天津求实飞博科技有限公司 | Strain coefficient self-adaptive mining surrounding rock optical fiber displacement sensor |
-
2009
- 2009-08-19 CN CN2009201728788U patent/CN201488837U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104101306A (en) * | 2014-07-24 | 2014-10-15 | 河海大学 | Fiber bragg grating temperature compensation method and ultrathin miniature rebar strainometer |
| CN104101306B (en) * | 2014-07-24 | 2016-08-31 | 河海大学 | A kind of optical fiber grating temperature compensation method and ultra-thin micro reinforcing steel strain gauge |
| CN105783751A (en) * | 2014-12-17 | 2016-07-20 | 中国航空工业集团公司沈阳发动机设计研究所 | Method for testing supporting point vector deformation under multi-field coupling |
| CN105783751B (en) * | 2014-12-17 | 2018-12-18 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of multi- scenarios method state lower fulcrum vector deformation test method |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN105333833B (en) * | 2015-10-27 | 2018-11-02 | 北京航空航天大学 | The unrelated fiber Bragg grating strain sensor of temperature |
| CN111811408A (en) * | 2020-07-06 | 2020-10-23 | 天津求实飞博科技有限公司 | Strain coefficient self-adaptive mining surrounding rock optical fiber displacement sensor |
| CN111811408B (en) * | 2020-07-06 | 2022-01-28 | 天津求实飞博科技有限公司 | Strain coefficient self-adaptive mining surrounding rock optical fiber displacement sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100526 Termination date: 20120819 |