CN104655320A - Tunable OFGB (optical fiber Bragg grating) low temperature sensor - Google Patents
Tunable OFGB (optical fiber Bragg grating) low temperature sensor Download PDFInfo
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- CN104655320A CN104655320A CN201410690410.3A CN201410690410A CN104655320A CN 104655320 A CN104655320 A CN 104655320A CN 201410690410 A CN201410690410 A CN 201410690410A CN 104655320 A CN104655320 A CN 104655320A
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- bragg grating
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Abstract
The invention relates to a tunable OFBG (optical fiber Bragg grating) low temperature sensor which comprises a stainless steel tube sleeve, an adjusting slide bar, an OFBG, an adjusting nut and the like. The OFBG is positioned in the middle position of the stainless steel tube sleeve, and tail fibers at two ends are fixed in the bottom of the sleeve and the center hole of the adjusting slide bar; guiding ribs are designed on the two sides of the adjusting slide bar, so as to enable the adjusting slide bar to be positioned in the grooves in two sides of the stainless steel tube sleeve, and damage to OFBG, caused by rotation, can be effectively prevented. The adjusting nut drives the adjusting slide bar to produce axial displacement through precise threads on the outer side of the stainless steel tube sleeve, therefore, the OFBG is enabled to produce axial pre-stretching, the tuning function for the center wave length of the OFBG is achieved, and the problem of crossed crosstalk of OFBGs due to adjacent center wave length during the use of a plurality of sensors can be prevented, and the tunable OFBG low temperature sensor is better in flexibility, is suitable for majority of temperature measurements in rugged surroundings such as ultralow temperature, strong magnetic field, heavy current, strong radiation and the like in low temperature engineering.
Description
Technical field
The invention belongs to technical field of electronic measurement, relate to a kind of optical fiber Bragg grating temperature sensor, particularly can realize the temperature sensor for low-temperature measurement of Fiber Bragg Grating FBG center wavelength tuning.
Background technology
Temperature is one of basic physical parameter that Fiber Bragg Grating FBG can be directly responsive, Study and appliance both at home and abroad based on optical fiber Bragg grating temperature sensor is existing a lot, but temperature focuses mostly between 0 ~ 100 DEG C, be applied as representative with high-temperature oil well measurement field of pyrometry is then main.Comparatively speaking, also less for Fiber Bragg Grating FBG Study and appliance at low ambient temperatures.And in the cryogenic engineering applications such as aviation fuel tank, large scale superconducting magnet, liquefied natural gas (LNG) storage, biomedical research, many places are in the rugged surroundings such as ultralow temperature, high-intensity magnetic field, big current, intense radiation, compared with traditional temperature sensor, Fiber Bragg Grating FBG with have electromagnetism interference, electrical insulating property good, be easy to form sensing network and carry out the advantages such as the distributed measurement of multi-point, these all meet the requirement to sensor performance in current cryogenic engineering.
Current, for the Design and Analysis of Fiber Bragg Grating FBG low-temperature sensor, generally have adopt special structural design (Yu Gang. the research of Novel scissors blade optical fiber Bragg grating encapsulation and low temperature sensing device, Zhejiang University's master thesis, 2004.), utilize electrochemical plating metal-coated membrane (Guo Mingjin on Fiber Bragg Grating FBG, Jiang Desheng. the low-temperature characteristics of gold-plated fiber-optical grating temperature sensor, low temperature physics journal, 2006, 28 (2): 138-141.), and adopt special cryogenic material to carry out encapsulating (He Wei, Xu Xiandong, Jiang Desheng. the high-sensitivity optical fibre grating temperature sensor of polymer encapsulated and low-temperature characteristics thereof, Acta Optica, 2004, 24 (10): 1316-1319.) etc. mode realizes.But in the process that Fiber Bragg Grating FBG is encapsulated, employing be that in the various production of adhesive of key component and use procedure, the homogeneity of colloid and the performance of packaging technology to sensor have a significant impact with epoxy resin.The more important thing is, because tackifier is different from optical fiber shrinkage factor, cause some fiber Bragg grating sensors at low ambient temperatures to occur chirp, even colloid unsticking causes sensor failure.Therefore, the Fiber Bragg Grating FBG low-temperature sensor of, good reliability simple in the urgent need to a kind of structure.
In addition, because Fiber Bragg Grating FBG is the sensor of Wavelength-encoding, the sensor General Requirements of adjacent center wavelength keeps the wavelength interval of 2 ~ 3nm.But most fiber Bragg grating sensor is after encapsulation, and in standard environment, Prague center reflection wavelength is fixed value, cannot realize artificial adjustment.Especially realize in distributed and networking sensing at the multiple sensor of employing, more will prevent the Fiber Bragg Grating FBG of adjacent center wavelength from producing cross-talk.And a kind of simple and easy to do method is exactly realize carrying out artificially tuning to the center reflection wavelength of fiber Bragg grating sensor in standard environment.
Summary of the invention
For above-mentioned prior art situation, the object of the invention is to, provide a kind of being applicable to apply at low ambient temperatures, good reliability, structure are simple, and can realize the artificially tuning Fiber Bragg Grating FBG low-temperature sensor of wavelength.
Now design of the present invention and technical solution are described below:
For achieving the above object, the present invention itself has good moisture sensitivity (about 10pm/ DEG C magnitude) according to bare fibre Bragg grating, in the scope that temperature is not less than 150K, the change of wavelength with temperature still presents the characteristic of good linear relationship, and designed measuring accuracy can meet the measurement requirement in most cryogenic engineering field.
A kind of tunable Fiber Bragg Grating FBG low-temperature sensor of the present invention, is characterized in that: by stainless-steel tube sleeve, regulate the adjustment of slide bar, Fiber Bragg Grating FBG, nut to form; The tail optical fiber at described Fiber Bragg Grating FBG two ends is separately fixed at stainless-steel tube sleeve bottom circular hole and regulates in the center pit of slide bar, and encapsulates with epoxyn is fixing; Described setting nut has internal thread, is spun by internal thread and stainless steel sleeve; Described adjustment slide bar is arranged in setting nut, and connects with stainless steel sleeve.
The present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: the grating writing district of described Fiber Bragg Grating FBG through secondary coating processing, to improve intensity and the pliability in grating grid region; Fiber Bragg Grating FBG is positioned at stainless-steel tube sleeve centre position, and two ends tail optical fiber is fixed on stainless-steel tube sleeve bottom by epoxyn and regulates in the center pit of slide bar.
The present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: described stainless-steel tube sleeve bottom is closed, circle centre position leaves aperture for fixed fiber Bragg grating one end tail optical fiber, there is accurate thread outside stainless-steel tube sleeve, be used for realizing coordinating with setting nut.
The present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: the post portion of described adjustment slide bar is flat, the slide bar termination of slide bar is regulated to be provided with guiding fin, the fit depressions reserved with stainless-steel tube sleeve the first half, can not rotary motion be produced when adjustment slide bar is moved vertically, avoid damaging Fiber Bragg Grating FBG; Regulate the other end formula slide bar termination of slide bar, the other end tail optical fiber of through hole for fixed fiber Bragg grating is left at the center of slide bar termination.
The present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: outside described setting nut, have anti-skidding cutting, it is driven to produce axial displacement after contacting with adjustment termination, slide bar top when it rotates up, and make Fiber Bragg Grating FBG produce axial prestretched, tuning with what realize Fiber Bragg Grating FBG centre wavelength;
The present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: described Fiber Bragg Grating FBG two ends tail optical fiber leaves modular connection, be convenient to sensor be connected with demodulated equipment, and multiple sensor serial connection forms distributed sensing test network.
Advantage of the present invention and beneficial effect are: by structural design, utilize and regulate the prestretched amount of bare fibre Bragg grating, can realize the tuning of Fiber Bragg Grating FBG centre wavelength, are conducive to the temperature measurement range and the sensitivity that improve sensor simultaneously.Avoid after adopting tackifier and other material to encapsulate Fiber Bragg Grating FBG, cause the chirp causing Fiber Bragg Grating FBG in low-temperature measurement process because of the difference of Material shrinkage rate.This sensor construction simplicity of design is easy, reliability is higher.Can according to the needs of in-site measurement in practical application, tuning by what realize Fiber Bragg Grating FBG centre wavelength to the adjustment of accurate nut, realize in distributed and networking sensing to meet at multiple sensor, prevent the Fiber Bragg Grating FBG of adjacent center wavelength from producing the problem of cross-talk, there is better dirigibility.Be applicable to the temperature survey in the rugged surroundings such as ultralow temperature, high-intensity magnetic field, big current, intense radiation in most cryogenic engineering.
Accompanying drawing explanation
Fig. 1: the outside drawing of tunable Fiber Bragg Grating FBG low-temperature sensor
Fig. 2: the principal section figure of tunable Fiber Bragg Grating FBG low-temperature sensor
The A-A of Fig. 3: Fig. 1 is to sectional view
Fig. 4:: regulate slide bar schematic diagram
Fig. 5: the slide bar termination schematic diagram regulating slide bar
Wherein: 1 stainless-steel tube sleeve 2 regulates slide bar 3 Fiber Bragg Grating FBG 4 setting nut 5 epoxyn 6 slide bar termination 7 to lead fin 8 optical fiber pigtail fixed orifice
Embodiment
Below in conjunction with accompanying drawing, structural principle of the present invention and principle of work are described further.
As depicted in figs. 1 and 2, the tunable Fiber Bragg Grating FBG low-temperature sensor of the present invention, comprises stainless-steel tube sleeve 1, regulates slide bar 2, Fiber Bragg Grating FBG 3, setting nut 4.Adopt the Fiber Bragg Grating FBG after secondary coating processing; Stainless-steel tube sleeve 1 base seal, circle centre position leaves aperture for fixed fiber Bragg grating 3 one end tail optical fiber; By Fiber Bragg Grating FBG 3 through stainless-steel tube sleeve 1 small hole at bottom part and the center pit regulating slide bar 2, ensure that grid region is positioned at stainless-steel tube sleeve 1 centre position, then adopt modified epoxide resin adhesive 5 to be individually fixed in by two ends tail optical fiber bottom stainless-steel tube sleeve 1 and regulate in the center pit of slide bar 2, keeping regulating the guiding fin 7 of slide bar 2 both sides to be positioned at the groove of stainless-steel tube sleeve 1 both sides simultaneously; Setting nut 4 is screwed in bottom stainless steel pipe socket cylinder 1, until setting nut 4 contacts with adjustment slide bar 2 top end head part, drive and regulate slide bar 2 to produce axial displacement, thus make Fiber Bragg Grating FBG 3 produce axial prestretched, and realize the tuber function of Fiber Bragg Grating FBG 3 centre wavelength.Tunable Fiber Bragg Grating FBG low-temperature sensor two ends tail optical fiber all leaves modular connection, both the measurement of single-sensor single point temperature can have been realized, also modular connection can be utilized to realize the serial connection of multiple sensor, to meet the needs of distributed and networked M&C system; There is accurate thread outside stainless-steel tube sleeve 1, be used for realizing coordinating with setting nut.
As shown in Fig. 3,4,5, Fig. 3 is that the A-A of Fig. 1 is to sectional view, slide bar 2 is regulated to be flat as can be seen from Figure, the slide bar termination 6 of slide bar 2 is regulated to be provided with guiding fin 7, the fit depressions reserved with stainless-steel tube sleeve 1 the first half, can not rotary motion be produced when adjustment slide bar 2 is moved vertically, avoid damaging Fiber Bragg Grating FBG 3; The other end regulating slide bar 2 is slide bar termination 6, and the other end tail of through hole for fixed fiber Bragg grating 3 is left at the center of slide bar termination 6.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (6)
1. a tunable Fiber Bragg Grating FBG low-temperature sensor, is characterized in that: by stainless-steel tube sleeve, regulate the adjustment of slide bar, Fiber Bragg Grating FBG, nut to form; The tail optical fiber at described Fiber Bragg Grating FBG two ends is separately fixed at stainless-steel tube sleeve bottom circular hole and regulates in the center pit of slide bar, and encapsulates with epoxyn is fixing; Described setting nut has internal thread, is spun by internal thread and stainless steel sleeve; Described adjustment slide bar is arranged in setting nut, and connects with stainless steel sleeve.
2. the tunable Fiber Bragg Grating FBG low-temperature sensor of one according to claim 1, it is characterized in that: the grating writing district of described Fiber Bragg Grating FBG is through secondary coating processing, Fiber Bragg Grating FBG is positioned at stainless-steel tube sleeve centre position, and two ends tail optical fiber is fixed on stainless-steel tube sleeve bottom by epoxyn and regulates in the center pit of slide bar.
3. the tunable Fiber Bragg Grating FBG low-temperature sensor of one according to claim 2, it is characterized in that: described stainless-steel tube sleeve bottom is closed, circle centre position leaves aperture for fixed fiber Bragg grating one end tail optical fiber, has accurate thread outside stainless-steel tube sleeve.
4. according to claim 3ly the present invention further provides a kind of tunable Fiber Bragg Grating FBG low-temperature sensor, it is characterized in that: the post portion of described adjustment slide bar is flat, the slide bar termination of slide bar is regulated to be provided with guiding fin, the fit depressions reserved with stainless-steel tube sleeve the first half, can not produce rotary motion when adjustment slide bar is moved vertically; Regulate the other end formula slide bar termination of slide bar, the other end tail optical fiber of through hole for fixed fiber Bragg grating is left at the center of slide bar termination.
5. the tunable Fiber Bragg Grating FBG low-temperature sensor of one according to claim 4, it is characterized in that: outside described setting nut, have anti-skidding cutting, it is driven to produce axial displacement after contacting with adjustment termination, slide bar top when it rotates up, and make Fiber Bragg Grating FBG produce axial prestretched, tuning with what realize Fiber Bragg Grating FBG centre wavelength.
6. the tunable Fiber Bragg Grating FBG low-temperature sensor of one according to claim 5, it is characterized in that: described Fiber Bragg Grating FBG two ends tail optical fiber leaves modular connection, be convenient to sensor be connected with demodulated equipment, and be connected in series with multiple sensor and form distributed sensing test network.
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| CN201410690410.3A CN104655320A (en) | 2014-11-25 | 2014-11-25 | Tunable OFGB (optical fiber Bragg grating) low temperature sensor |
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| CN201410690410.3A CN104655320A (en) | 2014-11-25 | 2014-11-25 | Tunable OFGB (optical fiber Bragg grating) low temperature sensor |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106368676A (en) * | 2016-09-29 | 2017-02-01 | 吉林大学 | Ice auger acoustic logging instrument provided with fiber bragg gratings |
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN110044392A (en) * | 2019-02-28 | 2019-07-23 | 南京智慧基础设施技术研究院有限公司 | A kind of pre- fibre optical sensor being embedded in precast construction |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
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| CN103109216A (en) * | 2010-05-01 | 2013-05-15 | 株式会社Mel电信 | Optical fiber connector in which Bragg grating is built |
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2014
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| US20020135912A1 (en) * | 2001-03-23 | 2002-09-26 | Ryall Richard J. | Extrinsically athermalized optical filter devices |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106368676A (en) * | 2016-09-29 | 2017-02-01 | 吉林大学 | Ice auger acoustic logging instrument provided with fiber bragg gratings |
| CN107356351A (en) * | 2017-07-17 | 2017-11-17 | 兰州大学 | A kind of grating flower Multifunction Sensor used under extreme low temperature environment |
| CN110044392A (en) * | 2019-02-28 | 2019-07-23 | 南京智慧基础设施技术研究院有限公司 | A kind of pre- fibre optical sensor being embedded in precast construction |
| CN114136349A (en) * | 2021-11-16 | 2022-03-04 | 西安交通大学 | High-temperature-resistant Bragg fiber grating sensor with variable sensing quantity and preparation method thereof |
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