CN1616935A - Full optical fiber temperature sensor - Google Patents
Full optical fiber temperature sensor Download PDFInfo
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- CN1616935A CN1616935A CN 200310111350 CN200310111350A CN1616935A CN 1616935 A CN1616935 A CN 1616935A CN 200310111350 CN200310111350 CN 200310111350 CN 200310111350 A CN200310111350 A CN 200310111350A CN 1616935 A CN1616935 A CN 1616935A
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- optical fiber
- fiber
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- refractive index
- temperature sensor
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Abstract
The present invention belongs to the field of fiber sensing, and is one kind of full optical fiber temperature sensor. Optical fiber is coated or painted with material of great refractivity temperature coefficient, and bent or even coiled, so that the optical fiber has bending loss varying with temperature and raised temperature sensitivity. The optical fiber temperature sensor thus formed has high reliability, low cost, high linearity, high stability and other features.
Description
Technical field
The invention belongs to sensory field of optic fibre, particularly middle cryogenic temperature sensory field.
Background technology
Fields such as that fiber temperature sensing system is mainly used in is inflammable and explosive, strong-electromagnetic field, Fibre Optical Sensor is present research focus because of advantages such as its anti-electromagnetic interference capability are strong, anticorrosive.
Wherein the semi-conductor type optical fiber temperature measurement system is a kind of scheme of present comparative maturity, sees Fig. 1, and 1 is input-output optical fiber, and 2 is GaAs material, and 3 is outer tube.The advantage of this system is to take the dual wavelength technology, good reliability, volume is little, but also shortcoming is arranged, and promptly wavelength stability is required high, in addition when temperature rises, sensing probe Output optical power and temperature are the index funtcional relationships, and along with the rising of temperature, Output optical power changes more and more littler, to 150 degree when above, practicality is just poor, in addition because 2 insertion makes that the insertion loss of sensing probe is bigger.
Other temp measuring system, as the fiber grating temperature sensor system, Raman's reflected temperature sensor-based system, its cost is all too high.
Utility model patent 92229667.7 provides a kind of solution preferably, but makes difficulty, and reliability and homogeneity of product be cannot say for sure to demonstrate,prove.
The object of the present invention is to provide a kind of simpler, cost is lower, the fibre optic temperature sensor of better reliability.
Be necessary to introduce earlier optical fiber cross section structure and transport property.See Fig. 2,6 is fiber core layer, and refractive index is the highest, and 7 is fibre cladding, and refractive index is taken second place, and 6 and 7 are generally glass material, and 5 is optical fiber coating, and refractive index is generally high molecular polymer less than 6 and 7, shields.Total reflection takes place at 6 and 7 interface in light, makes light propagate in fiber core layer 6 almost losslessly.But during fibre-optical bending, originally the power of propagating with the guided mode form in fibre core will partly be converted into the radiation mode power and the fibre core of overflowing and form loss.
Summary of the invention
The objective of the invention is to design that a kind of cost is lower, better reliability, the simpler fibre optic temperature sensor of structure.
The object of the present invention is achieved like this: ordinary optic fibre coat 5 is removed, change the bigger material of thermal refractive index coefficient into, again with fibre-optical bending, even the coiled fiber turns, see Fig. 3,8 is input optical fibre, 9 is that fiber turns (can be a half-turn, can be whole circle, even multi-turn), 10 is output optical fibre.There is certain insertion loss between 8 and 10, be because 9 bending loss causes, when light when 9 propagate, because the optical fiber curvature radius surpasses the minimum lossless bending radius of optical fiber in 9, therefore constantly having light to pass covering 7 from fiber core layer 6 leaks in the coat 5 and loses, because 5 refractive index ratios 7 are little, so part light will be relayed in 5 reflected backs 7, and then gets back to sandwich layer 6.In a certain temperature, 5,6,7 refractive index is a certain value, thereby bending loss is certain, when temperature variation, 5,6,7 refractive indexes are all changing, general 6 relative variations with 7 refractive indexes are less, light emittance from 7 is constant substantially, and 5 variations in refractive index are relatively large, make the luminous energy of 5 reflected backs 7 also change, cause the bending loss of macroscopic view last 9 to change, thereby the insertion loss also changes between 8 and 10, survey the variable quantity of luminous power between 8 and 10, can obtain the precise information of temperature variation.Thereby realize the purpose of optical-fiber temperature measuring.
Further scheme, the covering 7 of one section optical fiber is also adopted the material of big thermal refractive index coefficient, and this section optical fiber is carried out suitably crooked fixing, when temperature variation, fiber core layer and cladding index difference change, because this section optical fiber is in case of bending, bending loss of optical fiber also will change.According to the variable quantity of bending loss, can well obtain temperature information, thereby can realize the optical-fiber temperature measuring purpose equally.
A lot of macromolecular materials, its thermal refractive index coefficient is all bigger, polyimide etc. for example, the thermal refractive index coefficient of material such as silicon and lithium niobate is also higher in addition.These materials may be used to the present invention.
The present invention, the full fiber type temperature sensing device owing to adopted above-mentioned technical scheme, makes it compared with prior art, has following advantage and good effect:
1. the present invention is owing to adopt material with big thermal refractive index coefficient coat or the covering as optical fiber, and with this section fibre-optical bending, makes bending loss of optical fiber vary with temperature and changes, and its linearity is very good, and the probe cost is lower, simple in structure.
2. the present invention makes that fibre-optical bending length can be very long owing to adopt the fiber turns structure, and the thermometric that converges, and has improved the sensitivity of measuring temperature dexterously, makes fiber bending radius be unlikely to too small simultaneously and the Insertion Loss that causes popping one's head in is excessive.
Description of drawings
To the description of the some embodiment of full fiber type temperature sensing device of the present invention, can further understand purpose of the present invention, specific structural features and advantage by following in conjunction with its accompanying drawing.Wherein, accompanying drawing is:
Fig. 1 semiconductor temperature probe
Fig. 2 optical fiber cross section
Fig. 3 invention scheme
Fig. 4 embodiment one
Figure five embodiment two
Embodiment
See also shown in Figure 4ly, this is a kind of embodiment of full fiber type temperature sensing device of the present invention.Wherein 11 is light source, and 12 is photodetector.Curved fiber is a single-mode fiber, and coat is a polyimide, and more than heatproof 200 degree, thermal refractive index coefficient is in the 10-4 magnitude, and fiber turns 9 numbers of turn are 30 circles, and when temperature was raised to 135 degrees centigrade by 35 degrees centigrade, 8 and 10 Insertion Loss changed 10dB.When temperature variation, 12 output current will change, and realize temperature detection monitoring in view of the above.
See also shown in Figure 5ly, this is the another kind of embodiment of full fiber type temperature sensing device of the present invention.Wherein 13 are reflection border (being with 45 degree faraday revolving fragments), and 14 is Y branched optical cable shunt.The light of light source 11 emission enters 8 through 14, and decay enters 10 in 9, after border 13 reflections that are reflected.Because 45 degree faraday revolving fragments are arranged between 10 and 13, and when therefore getting back in the light 10, former TE moding is the TM mould, former TM moding is the TE mould, has overcome the relevant influence of polarization in the light path.Light is got back in 9 further decay (having increased optical fiber temperature detection partial-length) through 10, enters optical branching device 14 through 8, and wherein part light enters photo-detector 12.When temperature variation, 12 output current will change, and realize temperature detection monitoring in view of the above.
In a word, the present invention proposes the material that thermal refractive index coefficient is bigger as optical fiber coating or bag Layer, and with this section fibre-optical bending, even the method for coiled fiber turns, the fiber optic temperature that utilizes the method to make Sensing probe has the reliability height, and cost is low, the characteristics such as repeatability and good stability.
Claims (5)
1. full fiber type temperature sensing device, the fibre cladding or the coat material thermal refractive index coefficient that it is characterized in that being in case of bending are bigger.
2. a kind of device as claimed in claim 1 is characterized in that the optical fiber that adopted, can be single-mode fiber, also can be multimode optical fiber.
3. a kind of device as claimed in claim 2 is characterized in that the optical fiber that is in case of bending constitutes the fiber turns that contains the above optical fiber of a circle.
4. a kind of device as claimed in claim 3 is characterized in that optical fiber coating is the macromolecule polymer material of refractive index temperature sensitivity.
5. a kind of device as claimed in claim 3 is characterized in that fibre cladding is the bigger inorganic transparent optical materials of thermal refractive index coefficient such as silicon or lithium niobate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111350 CN1616935A (en) | 2003-11-10 | 2003-11-10 | Full optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310111350 CN1616935A (en) | 2003-11-10 | 2003-11-10 | Full optical fiber temperature sensor |
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| Publication Number | Publication Date |
|---|---|
| CN1616935A true CN1616935A (en) | 2005-05-18 |
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| CN 200310111350 Pending CN1616935A (en) | 2003-11-10 | 2003-11-10 | Full optical fiber temperature sensor |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457903A (en) * | 2008-02-27 | 2009-09-02 | Dublin Inst Of Technology | Optical fibre temperature sensing device |
| CN101957244A (en) * | 2010-09-27 | 2011-01-26 | 苏州光格设备有限公司 | Distributed optical fiber sensing system with high space resolving power |
| CN101696932B (en) * | 2009-11-02 | 2012-12-19 | 中国计量学院 | Optical fiber chemical sensor of over-long optical absorption action distance and preparation method thereof |
| CN103048064A (en) * | 2012-12-13 | 2013-04-17 | 南昌大学 | Production method for solder-packaged optical fiber macrobending loss temperature sensor |
| CN104359586A (en) * | 2014-10-11 | 2015-02-18 | 扬州市润特光电科技有限公司 | Optical fiber temperature sensor |
-
2003
- 2003-11-10 CN CN 200310111350 patent/CN1616935A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2457903A (en) * | 2008-02-27 | 2009-09-02 | Dublin Inst Of Technology | Optical fibre temperature sensing device |
| GB2457903B (en) * | 2008-02-27 | 2012-06-20 | Dublin Inst Of Technology | A temperature sensor device |
| CN101696932B (en) * | 2009-11-02 | 2012-12-19 | 中国计量学院 | Optical fiber chemical sensor of over-long optical absorption action distance and preparation method thereof |
| CN101957244A (en) * | 2010-09-27 | 2011-01-26 | 苏州光格设备有限公司 | Distributed optical fiber sensing system with high space resolving power |
| CN101957244B (en) * | 2010-09-27 | 2013-04-10 | 苏州光格设备有限公司 | Distributed optical fiber sensing system with high space resolving power |
| CN103048064A (en) * | 2012-12-13 | 2013-04-17 | 南昌大学 | Production method for solder-packaged optical fiber macrobending loss temperature sensor |
| CN104359586A (en) * | 2014-10-11 | 2015-02-18 | 扬州市润特光电科技有限公司 | Optical fiber temperature sensor |
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