CN100344949C - Temperature transducer for optical fiber grating steel tube packaging - Google Patents
Temperature transducer for optical fiber grating steel tube packaging Download PDFInfo
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- CN100344949C CN100344949C CNB2004100208330A CN200410020833A CN100344949C CN 100344949 C CN100344949 C CN 100344949C CN B2004100208330 A CNB2004100208330 A CN B2004100208330A CN 200410020833 A CN200410020833 A CN 200410020833A CN 100344949 C CN100344949 C CN 100344949C
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- optical fiber
- fiber grating
- glue
- temperature sensor
- steel pipe
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Abstract
The present invention relates to a new temperature sensor for optical fiber grating steel tube package, which belongs to the technical field of sensing. The current traditional electrical temperature sensor is easy to influence by electromagnetic interference, and the measuring accuracy is low; a naked optical fiber grating is easy to break and influence by outside stress. The present invention provides a double-layer steel pipe structure, 703 glue and an optical fiber grating packed by epoxy resin, wherein the double-layer steel structure effectively increases the themosensitive coefficients of the sensor. An optical fiber is fixed by epoxy resin glue, and the axial strain of the optical fiber is isolated. The 703 glue is coated in a naked optical fiber grating zone and on the outer wall of a 1.5mm steel pipe; an epoxy resin layer can be isolated for avoiding a multiple peak value phenomenon; the outside straining interference is effectively reduced. The new temperature sensor has the advantages of simple structure, cheap cost and easy installation. Furthermore, because of the characteristics of high measuring sensitivity, explosion resistance, electromagnetic interference resistance, etc. of the optical fiber grating; the present invention can be widely used for measuring temperature in the adverse work environment of civil engineering industry, petrochemical processing industry, nuclear industry, etc.
Description
Technical field
The invention belongs to field of sensing technologies, relate to a kind of steel pipe encapsulation temperature sensor based on Fiber Bragg Grating technology.
Background technology
At present, electric class temperature sensor relatively more commonly used mainly is thermocouple temperature sensor and thermistor temperature sensor.Therefore thermopair is mainly used to measure temperature difference, in order to obtain correct temperature value, must revise with a kind of reference temperature docking point, and the signal of output is smaller, and near normal temperature as do not note metering system, then its measuring accuracy is lower.The response speed of thermistor temperature sensor is fast, and resistance is strong with the variation of temperature ability, but long-time stability are poor.And traditional electric class temperature sensor is subject to electromagnetic interference, and precision is low, long-time stability difference and signal transmission distance short, can't satisfy as the abominable need of work in the working environment such as strong electromagnetic radiation.
Fibre optic temperature sensor is compared it with traditional sensor and is had many good qualities, and as highly sensitive, volume is little, and is corrosion-resistant, anti-electromagnetic-radiation, and light path is flexible, is convenient to realize remote measurement etc.Based on the fibre optic temperature sensor of intensity modulated, owing to be subject to influences such as light source power variation and line loss, its long-term measurement stability is poor but in actual applications.
Based on the fibre optic temperature sensor of Fiber Bragg Grating technology, adopt the Wavelength-encoding technology, eliminated the influence of light source power fluctuation and system loss, be applicable to long term monitoring; And the temperature-sensing system of a plurality of fiber gratings compositions, adopt an optical cable, can realize quasi-distributed measurement.But; because the core diameter very little (125 μ m) of bare fibre; shear behavior is very poor; and; the wavelength variations of bare optical fibers and bare optical gratings output is subject to the influence of extraneous strain; therefore, bare optical fibers and bare optical gratings being carried out packaging protection and effectively eliminate the influence that extraneous strain measures sensor temperature is highly significant.
Summary of the invention
The purpose of this invention is to provide a kind of steel pipe encapsulation temperature sensor, solved that existing electric class temperature sensor is subject to outside electromagnetic interference influence, measuring accuracy is not high and bare optical fibers and bare optical gratings is easily broken, be subject to shortcoming such as extraneous stress influence based on Fiber Bragg Grating technology.
The technical solution adopted in the present invention is: adopt double-layer pipe packaged fiber grating, the outer layer pipe diameter is 3mm, and the inner layer steel pipe diameter is 1.5mm, and wherein bare optical fibers and bare optical gratings is packaged in the 1.5mm steel pipe of internal layer.The length of steel pipe is decided according to practical situations.The specific practice of encapsulation is, at first with position, bare optical fibers and bare optical gratings grid region coating one deck 703 glue, after waiting to solidify fiber grating placed the 1.5mm steel pipe, use accurate fiber adjusting mount to adjust its position, make it be in central part, then pour into epoxide-resin glue, treat the epoxy resin adhesive curing after, the 1.5mm capillary tubing that outer wall evenly is coated with full 703 glue places outer 3mm steel pipe central part, pours into epoxide-resin glue again and fixes.The present invention uses double steel structure to effectively raise sensor heat-sensitive coefficients.In two-layer steel pipe, all mainly use epoxide-resin glue fixed fiber, the axial strain that can completely cut off optical fiber; And use 703 glue to apply bare optical fibers and bare optical gratings zone and 1.5mm outer wall of steel pipe, not only can the shading ring epoxy layer avoid occurring the multi-peak phenomenon, and effectively reduce extraneous strain and disturbed.
Effect of the present invention and benefit are, this temperature sensor has overcome the inherent defect of traditional electrical sensor and bare optical fibers and bare optical gratings is easily broken, be subject to shortcomings such as extraneous strain influence, volume is little, measuring accuracy is high, and can arrange that on an optical fiber a plurality of sensors carry out quasi-distributed temperature survey to multiple spot.This novel fiber grating steel pipe encapsulation temperature sensor is simple in structure, cheap, and site operation is easy for installation.And, because characteristics such as fiber grating has high-sensitive temperature sensing characteristic and essence is explosion-proof, anti-electromagnetic interference (EMI) can be widely used in the temperature survey of abominable working environment such as civil engineering work, petrochemical complex industry and nuclear industry.
Description of drawings
Fig. 1 is a fiber and grating steel tube sealed temperature sensor side direction diagrammatic cross-section.
Among the figure: 1. epoxide-resin glue, 2.703 glue, 3.3mm steel pipe, 4. optical fiber, 5. fiber grating, 6.1.5mm steel pipe.
Fig. 2 is the tangential diagrammatic cross-section of fiber and grating steel tube sealed temperature sensor.
Among the figure: 1. epoxide-resin glue, 2.703 glue, 3.3mm steel pipe, 5. fiber grating, 6.1.5mm steel pipe.
Embodiment
Be described in detail most preferred embodiment of the present invention below in conjunction with technical scheme and accompanying drawing.
The novel fiber grating steel pipe encapsulation temperature sensor side direction cross-sectional view that the present invention proposes as shown in Figure 1, tangential cross-sectional view is as shown in Figure 2.The specific practice of encapsulation is, at first with position, bare optical fibers and bare optical gratings 5 grid region coating one deck 703 glue 2, after waiting to solidify fiber grating 5 is placed 1.5mm steel pipe 6, use accurate fiber adjusting mount to adjust its position, make it be in central part, then pour into epoxide-resin glue 1, treat that epoxide-resin glue 1 solidifies after, the 1.5mm steel pipe 6 that outer wall evenly is coated with full 703 glue 2 places outer 3mm steel pipe 3 central parts, pours into epoxide-resin glue again and fixes.
Epoxide-resin glue 1 has the bonding strength height, the characteristics of good waterproof performance.Adopt epoxide-resin glue 1 packaged fiber grating, can effectively eliminate of the influence of extraneous stress sensor.Epoxide-resin glue 1 has reasonable flowability in earlier stage at its solidification process, but inevitably can have some bubbles, if with epoxide-resin glue 1 direct bonding fiber grating, can produce the uneven problem of position, grid region bonding strength, be easy to generate fiber grating 5 frequency hopping phenomenons.This sensor adopts the method that applies 703 glue 2 at position, bare optical fibers and bare optical gratings 5 grid region; because 703 glue, 2 bonding strengths are lower; can effectively protect fiber grating 5 grid regions, thereby eliminate incident multi-peak phenomenon in direct use epoxide-resin glue 1 packaged fiber grating 5 processes.
This packaged type has not only reduced extraneous strain effectively to the fiber grating temperature sensor Effect on Performance, and has eliminated the multi-peak phenomenon of using in epoxide-resin glue 1 packaged fiber grating 5 processes, and the temperature survey sensitivity that has improved fiber grating 5.
Claims (1)
1. a fiber and grating steel tube sealed temperature sensor is characterized in that adopting double-layer pipe packaged fiber grating, and the outer layer pipe diameter is 3mm, and the inner layer steel pipe diameter is 1.5mm, and wherein bare optical fibers and bare optical gratings is packaged in the inner layer steel pipe; The position, grid region of bare optical fibers and bare optical gratings applies 703 glue, and the inner layer steel pipe outer wall evenly applies 703 glue, adopts the epoxide-resin glue fixed fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100208330A CN100344949C (en) | 2004-06-24 | 2004-06-24 | Temperature transducer for optical fiber grating steel tube packaging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100208330A CN100344949C (en) | 2004-06-24 | 2004-06-24 | Temperature transducer for optical fiber grating steel tube packaging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1595081A CN1595081A (en) | 2005-03-16 |
| CN100344949C true CN100344949C (en) | 2007-10-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100208330A Expired - Fee Related CN100344949C (en) | 2004-06-24 | 2004-06-24 | Temperature transducer for optical fiber grating steel tube packaging |
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| Country | Link |
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| CN (1) | CN100344949C (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101738170B (en) * | 2009-12-18 | 2011-05-04 | 北京科技大学 | Distributed fiber sensor for large deformation measurement |
| CN102235920A (en) * | 2010-05-07 | 2011-11-09 | 上海启鹏工程材料科技有限公司 | Quick-response fiber bragg grating temperature sensor |
| CN102706544A (en) * | 2012-03-28 | 2012-10-03 | 上海市电力公司 | Method and device for monitoring looseness of flange bolt of sensibilization type optical fibber grating |
| CN102636128A (en) * | 2012-03-30 | 2012-08-15 | 大连理工大学 | Strain hoop sensor used for measuring hoop strain of pipeline |
| CN103674323B (en) * | 2013-12-25 | 2017-01-11 | 武汉理工大学 | Optical fiber grating temperature sensor for mine |
| CN107290076B (en) * | 2017-07-13 | 2023-08-15 | 兰州大学 | Multi-point measuring fiber bragg grating temperature sensor in extreme environment |
| CN111256868B (en) * | 2019-12-13 | 2023-09-26 | 中复神鹰碳纤维股份有限公司 | Pipeline fluid temperature sensor based on fiber bragg grating |
| CN115629443A (en) * | 2022-12-07 | 2023-01-20 | 武汉光谷航天三江激光产业技术研究院有限公司 | Packaging structure and packaging method of large-core-diameter high-power fiber grating |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6452667B1 (en) * | 1998-12-04 | 2002-09-17 | Weatherford/Lamb Inc. | Pressure-isolated bragg grating temperature sensor |
| US6462329B1 (en) * | 1999-11-23 | 2002-10-08 | Cidra Corporation | Fiber bragg grating reference sensor for precise reference temperature measurement |
| CN1482474A (en) * | 2003-07-14 | 2004-03-17 | 徐志宏 | Packaging structure of fibre-optical grating |
| CN2621288Y (en) * | 2003-05-30 | 2004-06-23 | 欧进萍 | Distribution fiber-optical grating sensitive package temp. probe |
-
2004
- 2004-06-24 CN CNB2004100208330A patent/CN100344949C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6452667B1 (en) * | 1998-12-04 | 2002-09-17 | Weatherford/Lamb Inc. | Pressure-isolated bragg grating temperature sensor |
| US6462329B1 (en) * | 1999-11-23 | 2002-10-08 | Cidra Corporation | Fiber bragg grating reference sensor for precise reference temperature measurement |
| CN2621288Y (en) * | 2003-05-30 | 2004-06-23 | 欧进萍 | Distribution fiber-optical grating sensitive package temp. probe |
| CN1482474A (en) * | 2003-07-14 | 2004-03-17 | 徐志宏 | Packaging structure of fibre-optical grating |
Non-Patent Citations (1)
| Title |
|---|
| 光纤Bragg光栅温度传感器封装方法研究 信思金，柴伟，传感器技术，第23卷第4期 2004 * |
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| CN1595081A (en) | 2005-03-16 |
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Granted publication date: 20071024 Termination date: 20110624 |