CN101067609A - Interference optical fiber sensor for composite material health monitoring - Google Patents
Interference optical fiber sensor for composite material health monitoring Download PDFInfo
- Publication number
- CN101067609A CN101067609A CN 200710072086 CN200710072086A CN101067609A CN 101067609 A CN101067609 A CN 101067609A CN 200710072086 CN200710072086 CN 200710072086 CN 200710072086 A CN200710072086 A CN 200710072086A CN 101067609 A CN101067609 A CN 101067609A
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- sensor
- fiber
- coupler
- health monitoring
- 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.)
- Granted
Links
Images
Landscapes
- Length Measuring Devices By Optical Means (AREA)
- Optical Transform (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention provides an interference optical fiber sensor which is used for the compound material health monitor. It is connection composed by surveys optical fiber, reference optical fiber, the optical fiber coupler, the fiber optic connector, the fiber optic connector through the optical fiber coupler II connects survey optical fiber and the reference optical fiber, the protoplasmic membrane is coated on the top of survey optical fiber and reference optical fiber. The invention applies to the compound material domain, relates to the interference optical fiber sensor, compares with the former sensor, the invention uses the E2000 fiber optic connector to protect pin from the dust pollution and the attrition; coats the medium membrane at the end of the survey optical fiber and reference optical fiber to form the high reflecting surface; E2000, the survey optical fiber and the reference optical fiber connects through the coupler. The sensor has small volume and light weight, is suitable for sticking or burying into the compound material.
Description
(1) technical field
What the present invention relates to is a kind of sensor, specifically a kind of sensor that is exclusively used in composite material health monitoring.
(2) background technology
Compound substance is owing to lightweight, the high-strength aerospace field that is widely used in.But compound substance is subjected to impacting and is easy to damage, therefore it is carried out health monitoring, guarantees that the safety of total is particularly important.The sensor that is used to monitor compound substance health status has types of fiber, piezoelectric type.The sensor that uses optical fiber fabrication to become, compare with traditional various sensors, have numerous advantages, its collective is long-pending little, in light weight, highly sensitive, loss is low, bandwidth, anti-electromagnetic interference (EMI), corrosion-resistant, electrical insulating property good, explosion-proof, light path deflection, be convenient to be connected with computing machine, advantage such as compact conformation, can the multiple physical quantity of sensing measure with chemistry, reliable operation, operating temperature range are from-150 ℃～500 ℃, and these all meet the requirement in outdoor rugged surroundings work fully.Existing fiber-optic grating sensor, optical fiber micro-bending sensor, though the F-P Fibre Optical Sensor has been used for the health monitoring of compound substance, they all are that the point of structure is monitored, and monitoring range of the present invention can customize according to structure, all can make from 0.3m～10m.
(3) summary of the invention
The object of the present invention is to provide and a kind ofly both can stick on body structure surface, can also be embedded in the composite structure, good with the compatibility of compound substance, imbed the mechanical property influence little interferometric optical fiber sensor that be used for composite material health monitoring of back to structure.
The object of the present invention is achieved like this: it is connected to form by measuring optical fiber, reference optical fiber, fiber coupler, the joints of optical fibre, the joints of optical fibre connect measuring optical fiber and reference optical fiber through fiber coupler, and the end of measuring optical fiber and reference optical fiber is coated with deielectric-coating.
The present invention can also comprise following feature:
1, the described joints of optical fibre are E2000 joints of optical fibre.
2, described fiber coupler is a single-mode optical-fibre coupler.
3, the deielectric-coating of the end of described measuring optical fiber and reference optical fiber is Ta
2O
5And SiO
2Film.
The length of sensor of the present invention can customize according to physical dimension, and the connector on it is dustproof wear-resisting, coupling mechanism miniaturization, the plated film reflectivity height of profile of optic fibre.Sensor mainly comprises following components and principal feature:
1) the E2000 joints of optical fibre: the E2000 connector is rare several joints of optical fibre that the spring gate is housed, and can protect contact pin not to be subjected to the pollution of dust like this, is not worn.When extracting connector, gate will be closed automatically, preventing pollutant, has therefore protected the infringement that causes because of network failure and harmful laser.The E2000 that uses links to each other with single-mode fiber, through actual measurement, maximum insertion 0.11dB, minimum 0.09dB, maximum return loss 61.2dB, minimum 59.5dB.
2) single-mode optical-fibre coupler: the coupling mechanism of use is 1 * 2, and centre wavelength is 1310nm, bandwidth ± 40nm, coupling ratio 50%: 50%.Its characteristics have low insertion loss, lower added loss, and low Polarization Dependent Loss, good stability, volume is little, and the metal sleeve diameter of encapsulation is 3mm.
3) fiber end face plated film: at fiber end face plating deielectric-coating, material selection Ta
2O
5And SiO
2, the number of plies of plated film and Thickness Design make reflectivity can reach 95% in the scope of 1300 ± 50nm.
After three parts are ready to, use optical fiber splicer that fiber section is connected, form light-path.
Ultimate principle of the present invention is:
Interferometric optical fiber sensor designs according to the Michelson principle of interference, and principle of work as shown in Figure 1.The light source of 1300nm sends broadband light, arrives connector through coupling mechanism, arrives measuring optical fiber and reference optical fiber through coupling mechanism again.Two-beam is got back in the (FBG) demodulator after fiber end face plated film place is reflected, in (FBG) demodulator after the distortion of distance that removable catoptron moved and structure is complementary, two-beam interferes, and maximum value appears in interference fringe, the distance that this moment, the module output reflector in the (FBG) demodulator moved, measurement finishes.
The performance of sensor of the present invention can be analyzed by the following method
1) emergent property
In order to check the emergent property of interferometric optical fiber sensor, made little feeding device, it is 10 μ m that the minimum of this device feeds distance.The left end of device is three platforms that direction is all adjustable, and right-hand member is by the transversely movable metal platform of spiral micrometer device.On two platforms, be fixed with fiber clamp, in the test by the right-hand member platform move stretching optical fiber, check its emergent property.
The long 500mm of the measuring optical fiber of clamping, pre-pretensioning 0.5% makes measuring optical fiber be in tensioning state, carries out tension test then.Each stretching optical fiber 10 μ m compare with the numerical value that SOFO readout instrument (demodulating equipment of sensor) measures then in the test, and the resolution of SOFO readout instrument is 2 μ m.Fig. 2 is the experimental result of emergent property, and as can be seen, sensor has the good linearity to strain-responsive, the linear fit degree 0.99976 of stress strain curve, the linear fit degree 0.9996 of unloading curve, and unloading back optical fiber returned to original state, only and initial value differ 0.002mm.
2) temperature characterisitic
Carry out this experiment with two sensors.The measuring optical fiber of a sensor is placed in the drying box, and reference optical fiber places under the room temperature, and two arms of another sensor are all put in the drying box.Fig. 3 has shown the measurement result of two sensors, and the changing value of only measuring optical fiber being put into the sensor of drying box is 5.392mm, and the changing value of two arms all being put into drying box is 0.818mm.
3) sensitivity analysis
Sensitivity is meant the output increment of sensor and the ratio of input increment, that is:
k＝Δy/Δx
Invention is for linear transducer, according to 2) in described experiment can get k=2 μ ε/μ m.For the sensor that large scale structure uses, this precision can meet the demands.The present invention is applied to field of compound material, relates to interferometric optical fiber sensor, compares with sensor in the past, and the E2000 joints of optical fibre are used in this invention, and the protection contact pin is not subjected to the pollution and the wearing and tearing of dust; End plating deielectric-coating at measuring optical fiber and reference optical fiber forms high reflecting surface; E2000, measuring optical fiber and reference optical fiber link to each other by coupling mechanism.Sensor bulk is little, and is in light weight, is fit to paste or be embedded in the compound substance.
(4) description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the emergent property curve;
Fig. 3 is a temperature characteristics.
(5) embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
The main composition that is used for the interferometric optical fiber sensor of composite material health monitoring comprises following components:
The E2000 joints of optical fibre; Single-mode optical-fibre coupler: the coupling mechanism of use is 1 * 2, and centre wavelength is 1310nm, bandwidth ± 40nm, coupling ratio 50%: 50%; Fiber end face plated film: at fiber end face plating deielectric-coating, material selection Ta
2O
5And SiO
2, the number of plies of plated film and Thickness Design make reflectivity can reach 95% in the scope of 1300 ± 50nm.In conjunction with Fig. 1, the light source 1 of 1300nm connects the joints of optical fibre 3 through fiber coupler I 2, and the joints of optical fibre connect measuring optical fiber 5 and reference optical fiber 6 through fiber coupler II4 again, and the end of measuring optical fiber and reference optical fiber is coated with deielectric-coating 7.Two-beam is got back in the (FBG) demodulator 8 after fiber end face plated film place is reflected.
Claims (4)
1, a kind of interferometric optical fiber sensor that is used for composite material health monitoring, it is connected to form by measuring optical fiber, reference optical fiber, fiber coupler, the joints of optical fibre, it is characterized in that: the joints of optical fibre are through fiber coupler be connected in parallel measuring optical fiber and reference optical fiber, and the end of measuring optical fiber and reference optical fiber is coated with deielectric-coating.
2, the interferometric optical fiber sensor that is used for composite material health monitoring according to claim 1 is characterized in that: the described joints of optical fibre are E2000 joints of optical fibre.
3, the interferometric optical fiber sensor that is used for composite material health monitoring according to claim 1 and 2, it is characterized in that: described fiber coupler is a single-mode optical-fibre coupler.
4, the interferometric optical fiber sensor that is used for composite material health monitoring according to claim 1 and 2, it is characterized in that: the deielectric-coating of the end of described measuring optical fiber and reference optical fiber is Ta
2O
5And SiO
2Film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100720869A CN100541186C (en) | 2007-04-23 | 2007-04-23 | The interferometric optical fiber sensor that is used for composite material health monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100720869A CN100541186C (en) | 2007-04-23 | 2007-04-23 | The interferometric optical fiber sensor that is used for composite material health monitoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101067609A true CN101067609A (en) | 2007-11-07 |
| CN100541186C CN100541186C (en) | 2009-09-16 |
Family
ID=38880223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2007100720869A Expired - Fee Related CN100541186C (en) | 2007-04-23 | 2007-04-23 | The interferometric optical fiber sensor that is used for composite material health monitoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100541186C (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324445B (en) * | 2008-07-30 | 2010-06-02 | 哈尔滨工程大学 | Distributed optical fiber white light interference sensor array based on adjustable Fabry-Perot resonant cavity |
| CN102175170A (en) * | 2011-03-23 | 2011-09-07 | 东南大学 | Detecting method and sensor for cracks of civil structure based on optical fiber long chirped grating frequency domain reflection technology |
| CN101644795B (en) * | 2009-07-16 | 2012-01-25 | 广州市丰华生物工程有限公司 | N type fiber coupler |
| CN103837361A (en) * | 2014-03-06 | 2014-06-04 | 卿新林 | Comprehensive monitor system for composite material mechanical connecting structure |
| CN111948050A (en) * | 2020-08-15 | 2020-11-17 | 哈尔滨工业大学 | Carbon fiber/epoxy resin three-dimensional woven composite material pulling-pulling fatigue damage evolution research test method based on synchrotron radiation CT |
| WO2024066948A1 (en) * | 2022-09-26 | 2024-04-04 | 中铁上海设计院集团有限公司 | Noise barrier realizing real-time monitoring of structural state of health, and design method therefor |
-
2007
- 2007-04-23 CN CNB2007100720869A patent/CN100541186C/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101324445B (en) * | 2008-07-30 | 2010-06-02 | 哈尔滨工程大学 | Distributed optical fiber white light interference sensor array based on adjustable Fabry-Perot resonant cavity |
| CN101644795B (en) * | 2009-07-16 | 2012-01-25 | 广州市丰华生物工程有限公司 | N type fiber coupler |
| CN102175170A (en) * | 2011-03-23 | 2011-09-07 | 东南大学 | Detecting method and sensor for cracks of civil structure based on optical fiber long chirped grating frequency domain reflection technology |
| CN102175170B (en) * | 2011-03-23 | 2012-10-24 | 东南大学 | Detecting method and sensor for cracks of civil structure based on optical fiber long chirped grating frequency domain reflection technology |
| CN103837361A (en) * | 2014-03-06 | 2014-06-04 | 卿新林 | Comprehensive monitor system for composite material mechanical connecting structure |
| CN103837361B (en) * | 2014-03-06 | 2016-03-23 | 常州飞智传感科技有限公司 | Compound substance machinery syndeton comprehensive monitor system |
| CN111948050A (en) * | 2020-08-15 | 2020-11-17 | 哈尔滨工业大学 | Carbon fiber/epoxy resin three-dimensional woven composite material pulling-pulling fatigue damage evolution research test method based on synchrotron radiation CT |
| CN111948050B (en) * | 2020-08-15 | 2021-04-06 | 哈尔滨工业大学 | Carbon fiber/epoxy resin three-dimensional woven composite material pulling-pulling fatigue damage evolution research test method based on synchrotron radiation CT |
| WO2024066948A1 (en) * | 2022-09-26 | 2024-04-04 | 中铁上海设计院集团有限公司 | Noise barrier realizing real-time monitoring of structural state of health, and design method therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100541186C (en) | 2009-09-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Sirkis et al. | In-line fiber etalon (ILFE) fiber-optic strain sensors | |
| CA2447388C (en) | Temperature insensitive fiber-optic torque and strain sensor | |
| CN100541186C (en) | The interferometric optical fiber sensor that is used for composite material health monitoring | |
| CN101042393A (en) | Healthiness monitoring device of compound material | |
| US7359586B2 (en) | Fiber optic strain sensor and associated data acquisition system | |
| CN102944253B (en) | Based on fiber grating transverse pressure and the temperature simultaneously measuring system of polarimetry | |
| Lin et al. | Packaging methods of fiber-Bragg grating sensors in civil structure applications | |
| Zhang et al. | An ultra-sensitive magnetic field sensor based on extrinsic fiber-optic Fabry–Perot interferometer and Terfenol-D | |
| Oliveira et al. | Simultaneous detection of humidity and temperature through an adhesive based Fabry–Pérot cavity combined with polymer fiber Bragg grating | |
| AU2021250898A1 (en) | Waveguide Interferometer | |
| CN103105138A (en) | Fiber bragg grating strain sensitivity calibration device and method | |
| Xiong et al. | Fiber Bragg grating displacement sensor with high measurement accuracy for crack monitoring | |
| CN1955640A (en) | Fibre-optical grating sensor and its wavelength demodulation method and sensor | |
| Choquet et al. | New generation of Fabry-Perot fiber optic sensors for monitoring of structures | |
| CN1047662C (en) | Opitical force transducer based on a fabry-perot resonator | |
| CN102374913A (en) | Universal pressure sensing device based on optical fiber microbending loss | |
| Yuan et al. | Fiber optic 2-D sensor for measuring the strain inside the concrete specimen | |
| CN1412527A (en) | Fibre-optic grating two-D sensor | |
| Suresh et al. | Shear force sensing by strain transformation using non-rectilinearly embedded fiber Bragg grating | |
| US5912457A (en) | Optically-based pressure sensor having temperature compensation | |
| KR20190012921A (en) | Submergence detection sensor using optical fiber grating | |
| CN209445986U (en) | A kind of patch type fiber Bragg grating strain sensor of high molecular material encapsulation | |
| Huang et al. | Fabrication and evaluation of hybrid silica/polymer optical fibre sensors for large strain measurement | |
| Guo et al. | A novel fiber Bragg grating pressure sensor with the smart metal structure based on the planar diaphragm | |
| CN2729645Y (en) | Temp. compensating fibre-optical grating broadband sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| 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: 20090916 Termination date: 20100423 |