CN101893492A - Mutually-clamped optical fiber grating temperature sensor - Google Patents
Mutually-clamped optical fiber grating temperature sensor Download PDFInfo
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- CN101893492A CN101893492A CN2010101395221A CN201010139522A CN101893492A CN 101893492 A CN101893492 A CN 101893492A CN 2010101395221 A CN2010101395221 A CN 2010101395221A CN 201010139522 A CN201010139522 A CN 201010139522A CN 101893492 A CN101893492 A CN 101893492A
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Abstract
The invention provides a mutually-clamped optical fiber grating temperature sensor. The sensor has a positive temperature coefficient and a negative temperature coefficient at the same time by using a mutually-clamped structure and two optical fiber gratings. Therefore, when a temperature changes, one optical fiber grating is always tensed, while the other optical fiber grating is not tensed and cannot slide, so that an observation value of the optical fiber grating not tensed can be always selected to improve the precision of the observation result of the sensor. The method is a new method for avoiding the zero drift phenomenon of a high-sensitivity optical fiber grating temperature sensor and may have a good application prospect in the field of temperature measurement.
Description
One, technical field
The present invention relates to Fibre Optical Sensor, especially thermometal optical fiber grating temperature sensitizing sensor.
Two, technical background
Fiber grating has the incomparable advantage of many other sensors: 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, and need not calibration in system's installation and the long-term use; 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.When temperature variation, cause that the sensitivity of returning wavelength variable quantity relative temperature variable quantity is:
Δλ
B/ΔT＝[(1-P
e)ε+ζ]λ
B (1)
Wherein, P
eValid round light constant for FBG; ε is that unit temperature changes the dependent variable of FBG down; ζ is the spectrum number of FBG.
The intrinsic temperature resolution of FBG is very low, about 0.1 ℃/pm.This all can't meet the demands in a lot of applications.Therefore, a lot of researchists just improve its temperature control and have done a lot of work.The principle of FBG temperature sensor enhanced sensitivity is to utilize FBG to temperature and the responsive simultaneously characteristic of strain, by reasonable structural design, FBG is in the same place with the high thermal expansion coefficient material package.When dut temperature changed, the deformation by the high thermal expansion coefficient material applied a dependent variable to FBG, made the wavelength variable quantity of returning of FBG strengthen.At first, the researchist is by directly sticking on FBG the enterprising trip temperature enhanced sensitivity of big expansion coefficient material.The effect of enhanced sensitivity that this method obtains is limited, is subjected to the restriction of material coefficient of thermal expansion coefficient.In March, 1999, people such as Jeahooh Hung have proposed to realize temperature sensitizing by thermometal that effect is obvious on Applied Optics periodical.Bi-metal temperature enhanced sensitivity principle; During temperature variation, the difference of the different metal length variable quantity of two kinds of thermal expansivity is changed into the variable quantity of grating length, make the variable quantity that returns centre wavelength of fiber grating increase, thereby improve the temperature control of fiber grating.
Because the sensing unit fiber grating of the type sensor is stretched in measuring process all the time, and the situation of slippage appears especially easily, the direction drift that this has just caused the wavelength of the type sensor to reduce to wavelength easily when stretching.
Three, summary of the invention
For addressing this problem, we propose to adopt two fiber gratings by mutually-clamped structure, make sensor possess positive and negative temperature coefficient simultaneously.Thereby when temperature variation, always a fiber grating is tightened up, and another fiber grating is not tightened up.Be not tightened up fiber grating and sliding phenomenon can not occur.Thereby, can make the observed result of this sensor more accurate by always choosing the observed reading of the fiber grating that is not tightened up.This method is a kind of new method that solves high-sensitivity optical fibre grating temperature sensor zero point drift, and good application prospect may be arranged in the temperature survey field.
A kind of mutually-clamped optical fiber grating temperature sensor, comprising two fiber gratings, two metal bars by different heat expansion coefficient is characterized in that: described two strut fixation together, described two poles respectively have an end points respectively outside their superimposed parts.Two fiber gratings are separately fixed at the position of two breach as shown in Figure 1.
Four, description of drawings
Accompanying drawing 1 is a structural representation of the present invention.
Wherein, 1 is the metal A in the thermometal, and 2 is the metal B in the thermometal, and 3 is the breach between metal A and the metal B, and 4 is gib screw, and 5 is the nut cylindrical void.
Five, specific embodiments
Below in conjunction with for example the present invention being done more detailed description:
At first make two bars as shown in drawings, metal A adopts duralumin, and metal B adopts invar.Then, by screw-nut they are combined.Then two fiber gratings are separately fixed at two gap positions.Like this, this sensor has just completed.
In order better to meet engineering demand, can improve by 200810105788.7 pairs of these products of referenced patent.Specifically, the bossing of bar 1 and bar 2 can be replaced with the bar of same material respectively, and corresponding making cylindrical void.
Claims (1)
1. mutually-clamped optical fiber grating temperature sensor, comprising two fiber gratings, two metal bars by different heat expansion coefficient is characterized in that: described two strut fixation together, described two poles respectively have an end points respectively outside their superimposed parts.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101395221A CN101893492A (en) | 2010-04-06 | 2010-04-06 | Mutually-clamped optical fiber grating temperature sensor |
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|---|---|---|---|
| CN2010101395221A CN101893492A (en) | 2010-04-06 | 2010-04-06 | Mutually-clamped optical fiber grating temperature sensor |
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| CN101893492A true CN101893492A (en) | 2010-11-24 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046897A (en) * | 2021-10-15 | 2022-02-15 | 中交第一公路勘察设计研究院有限公司 | double-F-shaped fiber grating temperature sensor |
Citations (7)
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|---|---|---|---|---|
| CN2550719Y (en) * | 2002-05-30 | 2003-05-14 | 欧进萍 | Optical fiber and grating sheet type package strainometer |
| EP1442326A2 (en) * | 2001-10-03 | 2004-08-04 | Qinetiq Limited | Mounting of optical components |
| CN2646684Y (en) * | 2003-09-05 | 2004-10-06 | 刘育梁 | Sensitivity enhanced structure of optical fiber grating temperature sensor |
| CN2679702Y (en) * | 2003-12-18 | 2005-02-16 | 南开大学 | Optical fiber raster temp sensing booster having double shoulder beams |
| CN101210851A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fibre pressure intensity sensor based on beam of constant strength |
| CN101298999A (en) * | 2008-05-05 | 2008-11-05 | 中国地震局地壳应力研究所 | Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature |
| CN101413831A (en) * | 2008-11-29 | 2009-04-22 | 大连理工大学 | Method for packaging sensitized optical fiber grating temperature sensor |
-
2010
- 2010-04-06 CN CN2010101395221A patent/CN101893492A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1442326A2 (en) * | 2001-10-03 | 2004-08-04 | Qinetiq Limited | Mounting of optical components |
| CN2550719Y (en) * | 2002-05-30 | 2003-05-14 | 欧进萍 | Optical fiber and grating sheet type package strainometer |
| CN2646684Y (en) * | 2003-09-05 | 2004-10-06 | 刘育梁 | Sensitivity enhanced structure of optical fiber grating temperature sensor |
| CN2679702Y (en) * | 2003-12-18 | 2005-02-16 | 南开大学 | Optical fiber raster temp sensing booster having double shoulder beams |
| CN101210851A (en) * | 2006-12-28 | 2008-07-02 | 中国科学院半导体研究所 | Optical fibre pressure intensity sensor based on beam of constant strength |
| CN101298999A (en) * | 2008-05-05 | 2008-11-05 | 中国地震局地壳应力研究所 | Method for making high-sensitivity optical fiber grating temperature sensor working in high and low temperature |
| CN101413831A (en) * | 2008-11-29 | 2009-04-22 | 大连理工大学 | Method for packaging sensitized optical fiber grating temperature sensor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114046897A (en) * | 2021-10-15 | 2022-02-15 | 中交第一公路勘察设计研究院有限公司 | double-F-shaped fiber grating temperature sensor |
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Open date: 20101124 |