CN101109663A - Optical fiber temperature sensor based on bending loss - Google Patents
Optical fiber temperature sensor based on bending loss Download PDFInfo
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- CN101109663A CN101109663A CNA2007100559472A CN200710055947A CN101109663A CN 101109663 A CN101109663 A CN 101109663A CN A2007100559472 A CNA2007100559472 A CN A2007100559472A CN 200710055947 A CN200710055947 A CN 200710055947A CN 101109663 A CN101109663 A CN 101109663A
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- optical fiber
- temperature sensor
- bending loss
- optic fiber
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Abstract
The invention provides an optic-fiber temperature sensor that is for detecting ambient temperature and based on bend loss, which is wound on the outer diameter of a glass bar as a multi-mode optic fiber of a sensitive element. One end of the multi-mode optic fiber is connected with a light source, another end is connected with a light power meter. When the ambient temperature changes, the refractivity of the multi-mode optic fiber and the cladding will change; after bending, the local value aperture of the multi-mode optic fiber changes, hence the bend loss of the multi-mode optic fiber is changed. The temperature sensor is resistant to electromagnetic disturbance, of high measuring sensibility, wide operation frequency band, simple structure, low cost and wide application field.
Description
Technical field
The present invention relates to the sensor in a kind of technical field of optical fiber sensing, relate in particular to a kind of Fibre Optical Sensor that utilizes the bending loss of optical fiber measures ambient temperature.
Background technology
A lot of fields in engineering and scientific research all will be monitored environment temperature, along with science and technology and progress of productivity, improve constantly for the requirement of measuring accuracy.Traditional thermometric mode mainly adopts thermopair, thermal resistance, semiconductor temperature sensor equitemperature sensing element to realize that it is low that they are confined to sensitivity, and anti-electromagnetic interference capability is poor, and it is narrow to use frequency band.
The more traditional temperature sensor of fibre optic temperature sensor has advantages such as anti-electromagnetic interference (EMI), sensitivity height.Common fibre optic temperature sensor has fiber-optical grating temperature sensor, the fibre optic temperature sensor based on fluorescence lifetime, interference-type optical fiber temperature sensor, distributed optical fiber temperature sensor etc., but because many, the complex process of coupled apparatus, higher, the optical signal detecting device complexity of production cost, can not be applied to widely and produce and study.Therefore development technology fibre optic temperature sensor simple, that production cost is low is necessary.
Summary of the invention
Above-mentioned defective at prior art, technical matters to be solved by this invention, be a kind of anti-electromagnetic interference (EMI) will be provided, measurement is highly sensitive, working band is wide, simple in structure, cost is low, application is widely based on the fibre optic temperature sensor of bending loss.
The present invention is based on the fibre optic temperature sensor of bending loss, is that the multimode optical fiber as sensitive element is wrapped on the external diameter of a glass bar closely, and an end of described multimode optical fiber is connected with light source, and the other end is connected with light power meter.
Described light source is light emitting diode or semiconductor laser.
The two ends of described multimode optical fiber are connected with light power meter with described light source by FC type bare fiber adaptor respectively.
The present invention is based on the fibre optic temperature sensor of bending loss, is to be connected between light source and the light power meter as sensitive element by the multimode optical fiber of big core diameter, large-numerical aperture (a＞50um, NA＞0.3) and to constitute.When environment temperature changed, the refractive index of multimode optical fiber fibre core and covering also changed thereupon, and the local numerical aperture of crooked back multimode optical fiber changes, and then changes the bending loss of multimode optical fiber.
The present invention has following advantage:
1. adopt the multimode optical fiber of big core diameter, large-numerical aperture (a＞50um, NA＞0.3), the coupling loss between coupling loss, optical fiber and light power meter between light source output light and optical fiber is little; The temperature-measuring range of fibre optic temperature sensor and heat sensitivity increase.
2. adopt the multimode optical fiber of different core diameters and numerical aperture, the temperature-measuring range of fibre optic temperature sensor is different with heat sensitivity.
3. standard components and parts---the FC type bare fiber adaptor that generally uses in the employing optical fiber communication had so both solved the coupled problem of optical fiber and light source and light power meter, had guaranteed the regularity problem of two fibre core end faces again, and simple in structure, cost is low.
4. optical fiber closely is wrapped on the external diameter of glass bar, and technology is simple, and volume is little, and is in light weight, and cost is low.
5. the present invention uses that light emitting diode or semiconductor laser are made light source, light power meter detects output intensity, and cost is low.
The present invention for Fibre Optical Sensor has anti-electromagnetic interference (EMI), advantages such as sensitivity height.
Description of drawings
Fig. 1 is the structural representation of a kind of fibre optic temperature sensor based on bending loss of the present invention.
Embodiment
Below by the embodiment that provides structure of the present invention is described in further detail.
With reference to Fig. 1, select core diameter a=50um, the multimode step change type optical fiber 3 of numerical aperture NA=0.4; Utilize the optical fiber pincers that the coat of outside, optical fiber two ends is peeled off; Utilize the fiber cut cutter that neat plane is cut at the optical fiber two ends; With FC type bare fiber adaptor (not shown) the optical fiber two ends are fixed; The selection radius is that 3.5mm, high glass bar 2 for 1mm are stand-by; Glass bar 2 surfaces in cleaning evenly are coated with last layer ultra-violet curing glue, with optical fiber tight writhing number circle (making the sparse arrangement signal of optical fiber in the accompanying drawings for ease of observing) on glass bar 2, make glass bar and optical fiber bonding with ultra violet lamp ultra-violet curing glue; Optical fiber 3 two ends are connected respectively on light source 1 and the light power meter 4 are the fibre optic temperature sensor that the present invention is based on bending loss.
The output power of this fibre optic temperature sensor and ambient temperature change linear, and temperature-measuring range is-59-73 ℃, heat sensitivity is 0.0076/ ℃, temperature resolution is 0.1 ℃.Change optical fiber core diameter, numerical aperture and bending radius and can reach different thermometric requirements, can be widely used in different occasions such as various industrial environments and scientific research.
Claims (3)
1. the fibre optic temperature sensor based on bending loss is characterized in that it being that the multimode optical fiber as sensitive element is wrapped on the external diameter of a glass bar closely, and an end of described multimode optical fiber is connected with light source, and the other end is connected with light power meter.
2. the fibre optic temperature sensor based on bending loss according to claim 1 is characterized in that the two ends of described multimode optical fiber are connected with light power meter with described light source by FC type bare fiber adaptor respectively.
3. the fibre optic temperature sensor based on bending loss according to claim 1 is characterized in that described multimode optical fiber passes through the ultra-violet curing glue bond on the external diameter of described glass bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100559472A CN101109663A (en) | 2007-08-09 | 2007-08-09 | Optical fiber temperature sensor based on bending loss |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100559472A CN101109663A (en) | 2007-08-09 | 2007-08-09 | Optical fiber temperature sensor based on bending loss |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101109663A true CN101109663A (en) | 2008-01-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CNA2007100559472A Pending CN101109663A (en) | 2007-08-09 | 2007-08-09 | Optical fiber temperature sensor based on bending loss |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101995307A (en) * | 2010-07-03 | 2011-03-30 | 聚光科技(杭州)股份有限公司 | Distributed optical fiber temperature sensing device with point-mode accurate temperature measurement |
| CN102679900A (en) * | 2012-05-18 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Method for calibrating strain parameters of optical fiber sensor and optical fiber grating |
| CN103048064A (en) * | 2012-12-13 | 2013-04-17 | 南昌大学 | Production method for solder-packaged optical fiber macrobending loss temperature sensor |
| CN103852089A (en) * | 2014-03-29 | 2014-06-11 | 吉林大学 | Plastic optical fiber sensor with multi-tapered hole bent structure |
| CN115127690A (en) * | 2022-06-14 | 2022-09-30 | 福州大学 | High-temperature optical fiber temperature measuring device based on fluorescence intensity ratio and thermal radiation temperature characteristics |
-
2007
- 2007-08-09 CN CNA2007100559472A patent/CN101109663A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101995307A (en) * | 2010-07-03 | 2011-03-30 | 聚光科技(杭州)股份有限公司 | Distributed optical fiber temperature sensing device with point-mode accurate temperature measurement |
| 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 |
| CN102679900A (en) * | 2012-05-18 | 2012-09-19 | 中国电子科技集团公司第四十一研究所 | Method for calibrating strain parameters of optical fiber sensor and optical fiber grating |
| CN103048064A (en) * | 2012-12-13 | 2013-04-17 | 南昌大学 | Production method for solder-packaged optical fiber macrobending loss temperature sensor |
| CN103852089A (en) * | 2014-03-29 | 2014-06-11 | 吉林大学 | Plastic optical fiber sensor with multi-tapered hole bent structure |
| CN115127690A (en) * | 2022-06-14 | 2022-09-30 | 福州大学 | High-temperature optical fiber temperature measuring device based on fluorescence intensity ratio and thermal radiation temperature characteristics |
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