CN102322991A - Multi-angle stress sensor of polarization-preserving long period fiber grating (LPFG) - Google Patents
Multi-angle stress sensor of polarization-preserving long period fiber grating (LPFG) Download PDFInfo
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- CN102322991A CN102322991A CN201110247129A CN201110247129A CN102322991A CN 102322991 A CN102322991 A CN 102322991A CN 201110247129 A CN201110247129 A CN 201110247129A CN 201110247129 A CN201110247129 A CN 201110247129A CN 102322991 A CN102322991 A CN 102322991A
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Abstract
The invention discloses a multi-angle stress sensor of a polarization-preserving long period fiber grating (LPFG). According to the sensor, stress is measured through using the LPFG manufactured by bow tie type polarization-preserving optical fibers, and the stress application direction is calculated through applying stress at different angles to the polarization-preserving LPFG and measuring the changing condition of wavelengths of projection light. The sensor has the advantages that the stress application direction can be measured while the stress is measured, the structure is simple, the operation is convenient, and the practicality is high.
Description
Technical field
The present invention relates to a kind of optical wavelength modulation type and protect inclined to one side LPFG strain gauge.According to protect wavelength change detection stress direction and the size that inclined to one side LPFG produces under the stress of different angles, belong to technical field of optical fiber sensing.
Background technology
Along with the development of fibre-optic practicability and optical communication technique, optical fiber has also obtained widespread use at sensory field, and develops rapidly and form a new research direction---optical fiber sensing technology.When light transmitted in optical fiber, parameters such as its intensity, phase place, frequency, polarization state received the influence of external environment condition easily, like stress, temperature, electric field, magnetic field etc.The technology that obtains the variation of respective physical amount through the variation of measuring these optical parameters is optical fiber sensing technology.Fibre Optical Sensor has advantages such as highly sensitive, that adaptability is strong, anti-electromagnetic interference (EMI), transmission range length, long service life, structure are small and exquisite with respect to traditional electrical quantity sensor, so Fibre Optical Sensor has obtained using widely in HTHP, strong-electromagnetic field, inflammable and explosive environment.
Fiber grating is that medium refraction index is periodically variable a kind of fiber optic passive device in fiber cores; Its effect is equivalent to a narrowband reflection mirror; The kind of fiber grating mainly contain the Bragg fiber grating (Fiber Bragg Grating, FBG), LPFG (LPFG), chirped fiber grating (CFBG) etc.The sensing Study of An of utilizing FBG to carry out parameters such as stress, temperature is very ripe, and has corresponding product to occur, and has obtained application corresponding in fields such as electric power, oil, chemical industry, is the most ripe at present quasi-distributed optical fiber sensor.In last decade, along with the development of LPFG, the researchist begins to turn to the LPFG The Characteristic Study.The research of LPFG aspect sensing becomes a focus that receives publicity at present, the sensing of aspect such as it can be used for strain, temperature, refractive index, reverses, bending, vibration.LPFG becomes it to the susceptibility of temperature and is badly in need of an improved problem at sensory field, because when carrying out other parameter measurements, there is the problem of cross sensitivity.V.Bhatia has reported the strain of LPFG and the sensing experiment of temperature the earliest in 1996, but the responsive characteristics when only having considered strain and temperature individualism respectively, does not consider the problem of cross sensitivity.Simultaneously, H.J.Patrick has reported when utilizing a pair of Bragg fiber grating and LPFG to realize strain and temperature and has measured.V.Bhatia utilized LPFG to realize strain and temperature simultaneously measuring in 1997; After this, people such as H.J.Patrick and B.H.Lee have carried out sensing experiment research to the flexural property of LPFG, and 2003, Wang Yi equality people utilized LPFG to design a cover microbend sensor; People such as Zhang Zijia studied the axial strain characteristic of LPFG in 2007.About also suitable recently many of being reported in of the experimental study of LPFG, and research also turns to from single mode LPFG with optical fiber and protects inclined to one side LPFG.From beginning in 2002, domestic researchist began to utilize the polarization maintaining optical fibre period Fiber Gratings Fabricated, and stress-temperature characteristic and the polarization characteristic of method for making, LPFG are studied, and the polarization maintaining optical fibre that is adopted is a panda type polarization-preserving fiber.
Polarization maintaining optical fibre mainly contains several types such as panda type, knot type, ellipse; Because the singularity of this body structure of polarization maintaining optical fibre; Make just can obtain two gratings on the equivalent meaning once writing fiber grating on the polarization maintaining optical fibre that their resonance wavelength is because the refractive index of place axle is different and different separately.What be used at present to make LPFG mainly is panda type polarization-preserving fiber; Report was not also met in the making that is used for LPFG for knot type polarization maintaining optical fibre; And knot type polarization maintaining optical fibre with respect to panda type polarization-preserving fiber because difference on manufacture craft, it is protected inclined to one side effect and has notable difference.
Summary of the invention
The problem that the present invention will solve provides a kind of high precision, multi-angle is protected inclined to one side LPFG strain gauge, the LPFG that utilizes knot type polarization maintaining optical fibre to make, the angle of the measure of the change stress through detecting output wavelength.
Description of drawings
Fig. 1 is a system architecture synoptic diagram one of protecting inclined to one side LPFG multi-angle strain gauge;
Among the figure: wide range led light source (1), protect inclined to one side LPFG (2), wavelength division multiplexer (3), spectrometer (4) has the flat board (5) of groove, knot type polarization maintaining optical fibre (6).
Fig. 2 is a system architecture synoptic diagram two of protecting inclined to one side LPFG multi-angle strain gauge;
Among the figure: wide range laser instrument (7), protect inclined to one side LPFG (8), filter plate (9), tunable fabry-perot (F-P) chamber (10), photodetector (11), data processing unit (12).
Embodiment
Embodiment 2 Fig. 2 are system architecture synoptic diagram of protecting inclined to one side LPFG multi-angle strain gauge; Comprise wide range laser instrument (7); Protect inclined to one side LPFG (8), filter plate (9), tunable fabry-perot (F-P) chamber (10); Photodetector (11), data processing unit (12).It is characterized in that: the optically-coupled that wide range laser instrument (7) sends gets into protects inclined to one side LPFG (8); Protecting inclined to one side LPFG (8) utilizes the amplitude mask method directly to be etched on the knot type polarization maintaining optical fibre; The outgoing wavelength carries out beam split through filter plate (9); Utilize tunable fabry-perot chamber (10) and photodetector (11) to carry out Wavelength demodulation, utilize data processing unit (12) to show the wavelength situation of change then, and finally obtain stress and apply direction.
Above-mentionedly be merely preferred embodiment of the present invention, be not used for limiting practical range of the present invention, adopt knot type polarization maintaining optical fibre to make the method for protecting inclined to one side LPFG and also be not limited to two kinds of above-mentioned methods.
Claims (3)
1. protect inclined to one side LPFG multi-angle strain gauge, it is characterized in that, comprise a light source; Protect inclined to one side LPFG for one; A wave filter; And Wavelength demodulation system; Wherein, said light source can be wide range LED or wide range laser instrument; Protecting inclined to one side LPFG adopts knot type polarization maintaining optical fibre to make; Wave filter can be wavelength division multiplexer, perhaps filter plate; The method of application of this sensor is: the light beam that is sent by wide range LED or wide range laser instrument gets into the inclined to one side LPFG of guarantor; Protect the externally following emergent light that produces two different wave lengths of stress of inclined to one side LPFG; Through wave filter two emergent lights are separated, utilize Wavelength demodulation system that the outgoing light wavelength is carried out demodulation then.
2. the inclined to one side LPFG multi-angle of guarantor according to claim 1 strain gauge is characterized in that, making the polarization maintaining optical fibre of protecting inclined to one side LPFG employing is knot type polarization maintaining optical fibre.
3. the inclined to one side LPFG multi-angle of guarantor according to claim 1 strain gauge is characterized in that, makes the method for protecting inclined to one side LPFG employing and can be amplitude mask method, perhaps bent forming method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110247129A CN102322991A (en) | 2011-08-26 | 2011-08-26 | Multi-angle stress sensor of polarization-preserving long period fiber grating (LPFG) |
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| CN201110247129A CN102322991A (en) | 2011-08-26 | 2011-08-26 | Multi-angle stress sensor of polarization-preserving long period fiber grating (LPFG) |
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| CN102322991A true CN102322991A (en) | 2012-01-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197741A (en) * | 2016-07-14 | 2016-12-07 | 盐城工学院 | Temperature-detecting device based on micro-nano long-period fiber grating sensor and method |
| CN107991241A (en) * | 2017-10-30 | 2018-05-04 | 合肥通用机械研究院 | A kind of verifying attachment and determination methods of composite material interlayer failure mode |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135459A (en) * | 2010-12-10 | 2011-07-27 | 杭州恒川科技有限公司 | AWG (Array Waveguide Grating) differential demodulation based intensity detection type PCF-LPG (Long-Period Grating Written in a Photonic Crystal Fiber) stress sensor and device |
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2011
- 2011-08-26 CN CN201110247129A patent/CN102322991A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102135459A (en) * | 2010-12-10 | 2011-07-27 | 杭州恒川科技有限公司 | AWG (Array Waveguide Grating) differential demodulation based intensity detection type PCF-LPG (Long-Period Grating Written in a Photonic Crystal Fiber) stress sensor and device |
Non-Patent Citations (2)
| Title |
|---|
| JAEJOONG KWON: "External-refractive-index-insensitive long period grating inscribed on a polarization maintaining fiber", 《LASERS AND ELECTRO-OPTICS，2004》 * |
| KYUNG JUN HAN: "Simultaneous Measurement of Strain and Temperature Incorporating a Long-Period Fiber Grating Inscribed on a Polarization-Maintaining Fiber", 《PHOTONICS TECHNOLOGY LETTERS，IEEE》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197741A (en) * | 2016-07-14 | 2016-12-07 | 盐城工学院 | Temperature-detecting device based on micro-nano long-period fiber grating sensor and method |
| CN106197741B (en) * | 2016-07-14 | 2018-08-28 | 盐城工学院 | Temperature-detecting device based on micro-nano long-period fiber grating sensor and method |
| CN107991241A (en) * | 2017-10-30 | 2018-05-04 | 合肥通用机械研究院 | A kind of verifying attachment and determination methods of composite material interlayer failure mode |
| CN107991241B (en) * | 2017-10-30 | 2020-07-07 | 合肥通用机械研究院有限公司 | Device for detecting and judging composite material interlayer failure mode |
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Application publication date: 20120118 |