CN201378086Y - Sensitized non-intrinsic F-P optical fiber temperature sensor - Google Patents
Sensitized non-intrinsic F-P optical fiber temperature sensor Download PDFInfo
- Publication number
- CN201378086Y CN201378086Y CN200920010275U CN200920010275U CN201378086Y CN 201378086 Y CN201378086 Y CN 201378086Y CN 200920010275 U CN200920010275 U CN 200920010275U CN 200920010275 U CN200920010275 U CN 200920010275U CN 201378086 Y CN201378086 Y CN 201378086Y
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- temperature sensor
- intrinsic
- enhanced
- extrinsic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Measuring Temperature Or Quantity Of Heat (AREA)
- Radiation Pyrometers (AREA)
Abstract
The utility model discloses a sensitized non-intrinsic F-P optical fiber temperature sensor which belongs to the technical field of sensors, and relates to a sensitized non-intrinsic F-P optical fiber temperature sensor, which is characterized in that defects are produced by carving and pulled apart under the action of concentrated stress to form level optical fiber end surfaces; adhesive is used to adhere a metal capillary and a bare optical fiber of a non-intrinsic F-P interference cavity; and the sensitized non-intrinsic F-P optical fiber temperature sensor is formed by two level optical fiber end surfaces and the metal capillary with the thermal expansion coefficient higher than glass capillary. The sensitized non-intrinsic F-P optical fiber temperature sensor has the advantages of good optical fiber end surfaces, no impurity in the interference cavity, quick temperature response, high temperature sensitivity, small size, simple structure, high reliability, flexible manufacturing and the like, and can be used for the high-precision temperature measurement on strong electro-magnetic radiation, flammable, explosive and other occasions.
Description
Technical field
The utility model belongs to sensor technical field, relates to a kind of fibre optic temperature sensor, specially refers to a kind of extrinsic F-P optical fiber sensor of temperature sensitizing.
Background technology
The non-electric class thermometer that generally adopts in the temperature survey is a mercury thermometer, and measurement result is stable, but can not realize the automatic record data of computing machine.Electronic temperature transmitter can be realized temperature survey and control flexibly, and use more in all kinds of industrial control equipments and electronic instrument: thermopair can be realized high temperature measurement, but precision is not high, measures inaccurate under the not good situation of cold junction compensation; Platinum resistance measuring accuracy height, but measurement sensitivity is lower, and measurement result is inaccurate under the bad situation of wire compensation; The temperature control height of thermistor, but have bigger non-linearly, and long-time stability are relatively poor.In addition, the electronic temperature sensor ubiquity is subject to electromagnetic interference, and long-time stability are poor, can not realize shortcomings such as distant signal transmission.
Extrinsic type F-P Fibre Optical Sensor is one of present the most widely used a kind of optical Fiber Method-Po cavity sensor, typical structure is two butt faces to be cut optical fiber flat or polishing insert in the collimation kapillary that an internal diameter and fibre cladding diameter be complementary, and two fiber end faces and the air-gap between the two have constituted the Fabry-Perot cavity of an extrinsic type.It is simple that extrinsic type F-P Fibre Optical Sensor has manufacture craft, flexible design, by to the selection of optical fiber and collimation material capillaceous and to the control of machined parameters, can regulate measurement sensitivity, eliminate the cross-sensitivity between parameter, realize physical quantity high-sensitivity measurements such as temperature, pressure and strains.
Compare with the conditional electronic temperature sensor, enhanced extrinsic F-P optical fiber temperature sensor has that volume is little, measuring accuracy is high, anti-electromagnetic interference (EMI), good long term stability, the enhanced extrinsic F-P optical fiber temperature sensor of employing Wavelength demodulation system is not subjected to the influence of light source power fluctuation and optical fiber disturbance substantially, can be used in temperature survey under long-term measurement and the rugged surroundings.The enhanced extrinsic F-P optical fiber temperature sensor of making adopts glass optical fiber and glass capillary substantially at present, and the temperature sensitizing effect is limited; Enhanced extrinsic F-P optical fiber temperature sensor is bonded on the big material of sheet metal or other thermal expansivity can improves temperature control, but have shortcomings such as temperature-responsive is slow, volume is big, and need to consider the influence of thermal stress measurement result.Because glass capillary is thinner, therefore the enhanced extrinsic F-P optical fiber temperature sensor of not doing any protection is subjected to the extruding of external force and shearing easily and destroys, in the process of practical application, need usually to adopt metal tube that it is encapsulated, cause the physical dimension of sensor bigger, temperature-responsive speed is slow, and the advantage of original sensor can not fully be represented.
Summary of the invention
The purpose of this utility model provides a kind of extrinsic F-P optical fiber sensor of temperature sensitizing, has temperature control height, volume is little, simple in structure, temperature-responsive is fast characteristics.
The technical solution of the utility model is to pass through the method formation of delineation and the defective of bare fibre axis quadrature on the surface of bare fibre, and will have in the bare fibre insertion metal capillary of defective the position of adjusting scratch defects point in pipe; The metal capillary end points and the bare fibre that will be positioned at the terminal side of bare fibre by gluing mode are fixed together, other end to optical fiber applies pulling force, when the tension at scratch defects place reaches the fracture threshold value, bare fibre splits from fault location, form and the vertical parallel cleavage plane of shaft axis of optic fibre, two parallel cleavage planes and the air-gap between the two have then constituted an enhanced extrinsic F-P interference cavity; Regulate the length of interference cavity, be fixed together, produce the enhanced extrinsic F-P optical fiber temperature sensor of enhanced sensitivity by the other end and the bare fibre of gluing mode with metal capillary; Sheath is installed on the tail optical fiber of enhanced extrinsic F-P optical fiber temperature sensor as required to be protected.
Concrete manufacturing technology is: will remove overlay and be placed on the optical fiber cutting knife through the bare fibre of surface cleaning processing, buckle well the pressing plate of both sides, promote blade, at the cut of bare fibre surface formation with bare fibre axis quadrature, but do not interrupt, the bare fibre that will have scratch defects inserts in the metal capillary, regulates the position of scratch defects in pipe by fiber adjusting mount, and the metal capillary end points and the bare fibre that adopt gluing mode will be positioned at the terminal side of bare fibre then are fixed together.Pull back tail optical fiber afterwards, bare fibre surface indentation defective becomes the weakest link on the overall optical fibre owing to stress is concentrated, when tension reaches the fracture threshold value of this point, bare fibre splits from the indentation fault location, form two end faces smooth, with the vertical parallel cleavage plane of shaft axis of optic fibre, two parallel cleavage planes and the air-gap between the two have then constituted an enhanced extrinsic F-P interference cavity.The chamber of regulating extrinsic F-P optical fiber sensor by fiber adjusting mount is long, and measure the length of interference cavity in real time by the extrinsic F-P optical fiber sensor demodulating system, after chamber length is adjusted to design load, by gluing mode the metal capillary other end and tail optical fiber are fixed together, produce the enhanced extrinsic F-P optical fiber temperature sensor of temperature sensitizing.According to the needs of the applied environment of sensor optical fiber jacket being installed on tail optical fiber in the reality is protected.
Effect of the present utility model and benefit are, the utility model adopts the big metal capillary of thermal expansivity to substitute the enhanced extrinsic F-P optical fiber temperature sensor that material such as traditional quartz and glass go out enhanced sensitivity, compare with the technology that adopts glass optical fiber or glass capillary to make enhanced extrinsic F-P optical fiber temperature sensor, has the temperature control height, advantage such as not fragile; Compare with traditional technology that improves temperature control on sheet metal and the big material of other thermal expansivity that enhanced extrinsic F-P optical fiber temperature sensor is bonded at, have that temperature-responsive is fast, volume is little, simple in structure, reliability is high and lay advantages such as flexible, the high-precision temperature that can be used under strong electromagnetic radiation, the occasion such as inflammable and explosive is measured.
Description of drawings
Accompanying drawing 1 is the diagrammatic cross-section of the enhanced extrinsic F-P optical fiber temperature sensor of enhanced sensitivity.
Among the figure: 1 enhanced extrinsic F-P interference cavity; 2 metal capillaries; 3 parallel cleavage planes; 4 bare fibres; 5 tail optical fibers.
Embodiment
Describe most preferred embodiment of the present utility model in detail below in conjunction with accompanying drawing.
With internal diameter is 0.13mm, and external diameter is that the aluminum metal capillary of 2mm is inserted cleaning and oven dry in the ultrasound wave pond that alcohol is housed.The overlay of optical fiber one end is removed, bare fibre is than the long 5～10mm of aluminum metal capillary, adopt the surperficial scrub of acetone with bare fibre 4, then bare fibre 4 is placed on the frame of optical fiber cutting knife, buckle well the buckle of both sides, promote blade, can form cut at optical fiber surface like this, but can not interrupt optical fiber in the process of operation.The bare fibre 4 that will have the indentation defective inserts in the aluminum metal capillary 2, regulate the position of indentation defective in aluminum metal capillary 2, adopt epoxy resin binder that the free end and the aluminum metal capillary 2 of optical fiber are sticked together then, pull back tail optical fiber 5 by fiber adjusting mount afterwards, because there has been defective in optical fiber surface, therefore when tension reaches a certain value, optical fiber draws back from indentation, form smooth, then constituted an enhanced extrinsic F-P chamber 1 with fiber axis to 3, two parallel cleavage planes 3 of vertical parallel cleavage plane and the air-gap between the two.Can regulate the length in enhanced extrinsic F-P chamber 1 by fiber adjusting mount, and the length of the fibre-optical F-P sensor demodulating system Real Time Observation interference cavity by being connected on tail optical fiber 5 rear ends, after chamber length is adjusted to preseting length, be fixed together by an other end and the tail optical fiber 5 of gluing mode, can produce the enhanced extrinsic F-P optical fiber temperature sensor of enhanced sensitivity by above-mentioned steps efficiently, flexibly aluminum metal capillary 2.
According to document " optical fiber EFPI sensing system and the research of using in the oil gas well thereof ", in conjunction with the structure of above-mentioned enhanced extrinsic F-P optical fiber temperature sensor, then ambient temperature changes the long variable quantity in chamber cause and is:
Δd＝(α
mL
g-α
fL
if-α
fL
rf)ΔT
Wherein, L
gBe the gauge length of sensor, i.e. length between two of metal capillary and optical fiber point of fixity, L
IfAnd L
RfBe respectively incident optical and mirror based fiber optica length in the metal capillary, Δ T is a temperature variation, α
mAnd α
fBe respectively the thermal expansivity of metal capillary and optical fiber.Fibre core is mixed the single-mode fiber of germanium and the thermal expansivity of aluminum metal pipe is respectively 5.6 * 10
-7/ ℃ and 24 * 10
-6/ ℃.
The chamber of enhanced extrinsic F-P optical fiber temperature sensor is long-range less than its gauge length L
g, therefore L is arranged
If+ L
Rf≈ L
g, following formula can abbreviation be:
Δd＝(α
m-α
f)L
gΔT
Because α
mMuch larger than α
f, and the thermal expansivity of single-mode fiber is certain, the temperature coefficient that therefore adopts the enhanced extrinsic F-P optical fiber temperature sensor that metal capillary makes is mainly by the thermal expansivity decision of the gauge length of sensor and metal tube.If adopt the aluminum metal capillary, under the identical situation of other technology temperature sensitive than about 8 times of the increases of adopting glass capillary, thereby realize the purpose of enhanced sensitivity.
Claims (1)
1. the enhanced extrinsic F-P optical fiber temperature sensor of an enhanced sensitivity is characterized in that: in the indentation defective of the surface of bare fibre (4) delineation with bare fibre (4) axis quadrature, will have bare fibre (4) the insertion metal capillary (2) of indentation defective; To be positioned at metal capillary (2) end points and gluing being fixed together of bare fibre (4) of the terminal side of bare fibre (4); The indentation fault location splits and forms two smooth cleavage planes (3) and the air-gap the two between vertical with shaft axis of optic fibre and constituted an enhanced extrinsic F-P interference cavity (1); With an other end and gluing being fixed together of bare fibre (4) of metal capillary (2), constitute the enhanced extrinsic F-P optical fiber temperature sensor of an enhanced sensitivity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920010275U CN201378086Y (en) | 2009-01-17 | 2009-01-17 | Sensitized non-intrinsic F-P optical fiber temperature sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920010275U CN201378086Y (en) | 2009-01-17 | 2009-01-17 | Sensitized non-intrinsic F-P optical fiber temperature sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201378086Y true CN201378086Y (en) | 2010-01-06 |
Family
ID=41518202
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200920010275U Expired - Fee Related CN201378086Y (en) | 2009-01-17 | 2009-01-17 | Sensitized non-intrinsic F-P optical fiber temperature sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201378086Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804119A (en) * | 2021-09-22 | 2021-12-17 | 中国核动力研究设计院 | High-temperature and high-pressure resistant optical fiber strain sensor |
-
2009
- 2009-01-17 CN CN200920010275U patent/CN201378086Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113804119A (en) * | 2021-09-22 | 2021-12-17 | 中国核动力研究设计院 | High-temperature and high-pressure resistant optical fiber strain sensor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101476949B (en) | Production method for sensitivity enhanced extrinsic F-P optical fiber temperature sensor | |
| Liang et al. | Temperature compensation fiber Bragg grating pressure sensor based on plane diaphragm | |
| CN102829893B (en) | Method for simultaneously measuring temperature and stress of fiber bragg gratings (obtained by corrosion) with different diameters | |
| CA2772019C (en) | Miniature fiber optic temperature sensors | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| CN101614601B (en) | Internal fiber integration type miniature Michelson interferometric sensor and manufacturing method thereof | |
| CN101308598B (en) | Fire probe system with optical fiber and grating sensing temperature | |
| CN203287311U (en) | Double-cone fine-core single mode fiber based transmission-type optical fiber humidity sensor | |
| CN108759983A (en) | One kind is begun to speak differential Fabry-perot optical fiber liquid level sensor and its level measuring method | |
| CN109632133A (en) | A kind of temperature measuring device and method based on optical fiber | |
| CN111208087B (en) | Optical fiber humidity sensor based on thick cone, working principle and preparation method thereof | |
| CN114137273B (en) | Temperature-sensitive current eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN112414581A (en) | Temperature sensor based on multicore optic fibre | |
| CN201378086Y (en) | Sensitized non-intrinsic F-P optical fiber temperature sensor | |
| CN103134609A (en) | High-sensitivity fiber bragg grating temperature sensor with adjustable sensitivity coefficient | |
| CN102364313B (en) | High-temperature sensing method based on optical fiber micro Michelson interference on spherical end face | |
| CN109374026B (en) | Preparation method of welding-free open cavity FP fiber grating sensor | |
| CN114137446B (en) | Temperature-sensitive magnetic field eliminating sensing device of FBG cascade optical fiber composite structure | |
| CN208171472U (en) | A kind of high sensitivity optical fiber temperature sensor | |
| CN103090990A (en) | Manufacturing method for high temperature resistant optical fiber macrobend loss temperature sensor | |
| Li et al. | A highly sensitive curvature sensor based on omega-shaped long-period fiber grating | |
| CN203479265U (en) | Metal armored distributed sensitive optical cable for monitoring surface strain of object | |
| CN213874715U (en) | Optical fiber temperature sensor | |
| CN115452196A (en) | Device and method for testing high-precision temperature sensitivity coefficient of optical fiber sensing ring | |
| CN110986819B (en) | Fabry-Perot cavity type optical fiber curvature sensing probe and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20110117 |