CN102679900A - Method for calibrating strain parameters of optical fiber sensor and optical fiber grating - Google Patents
Method for calibrating strain parameters of optical fiber sensor and optical fiber grating Download PDFInfo
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- CN102679900A CN102679900A CN2012101549430A CN201210154943A CN102679900A CN 102679900 A CN102679900 A CN 102679900A CN 2012101549430 A CN2012101549430 A CN 2012101549430A CN 201210154943 A CN201210154943 A CN 201210154943A CN 102679900 A CN102679900 A CN 102679900A
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Abstract
The invention discloses a method for calibrating strain parameters of an optical fiber sensor and an optical fiber grating. A standard strain value is generated by a standard transmission piece which is manufactured by a mode of combining a precise displacement sensor and the optical fiber sensor through using a displacement measurement method, so that the strain parameters of the optical fiber sensor and the optical fiber grating can be calibrated indirectly. The method is characterized in that the standard transmission piece comprises a concave optical bracket, the standard optical fiber sensor, the precise displacement sensor and a displacement sensor controller, wherein the concave optical bracket consists of an optical sliding rail guide slot, a fixed end and a free end; V-shaped slots are engraved above the free end and the fixed end; and a base and a sliding rail of the displacement sensor are fixed by bolts, connected with the free end of the optical bracket in the transverse direction and then connected with the displacement sensor controller through data lines.
Description
Technical field
The present invention relates to Calibration Method to Fibre Optical Sensor, fiber grating strain parameter.
Background technology
Based on the Fibre Optical Sensor (optical fibre gyro fiber optic loop) of Brillouin scattering formula with based on the strain transducer (FBG) of fiber grating, be widely used in the health detection field of attitude control, precise guidance and the large bridge building of Aero-Space device.The strain that Brillouin scattering coefficient, wavelength shift and optical fiber are born connects.These methods exist instrument expensive, and shortcoming such as be difficult to trace to the source.Existing calibration test method is the mode that adopts matching measurement mostly, and measuring accuracy is difficult to guarantee.Precision and stability that stress distribution situation that fiber optic loop is inner and quality thereof directly affect optical fibre gyro are the key factors of the domestic current high-precision optical fiber gyro of restriction.The at present domestic fiber optic loop stress distribution test macro that does not also have ripe commercialization, main dependence on import.How the stress distribution of fiber optic loop inside is tested and demarcated, solving strain traceability problem also is the important subject in current strain transducer field, and it also is one of current research hot topic that the strain of FBG is accurately demarcated.
At present both at home and abroad seldom about the calibration steps introduction of fibre optic strain sensor strain parameter; These methods mostly are to obtain a dependent variable as standard strain reference quantity through other modes; The calibration steps of reference resistance foil gauge mainly contains elastic modulus method, beam of uniform strength method etc.
Elastic modulus method is that Fibre Optical Sensor to be measured is sticked on the tensile test specimen of particular elastomeric material making, utilizes puller system that test specimen is stretched then.Metal material carries in the elastic range, and normal stress σ is proportional to normal strain ε, and this rule is called Hooke's law, is formulated as follows: σ=E ε
E is called elastic modulus in the formula, σ=Δ P/A wherein, and A is the test specimen area of section, ε is the tensile test specimen dependent variable.Measuring the strain value that carries generation under the loading, then dependent variable can be calculated as follows:
The beam of uniform strength is as shown in Figure 1, and beam is thick to be h, and beam length is L, and stiff end is wide to be B, and free end is wide to be b.The cross section of beam becomes isosceles triangle.With fibre optic strain sensor be pasted on semi-girder upper and lower surfaces; If the free end at semi-girder applies a controlled pressure straight down; Can know that by the mechanics of materials stress that each xsect produces in the beam equates, the strain of optional position equates that also its strain formula does on the surface
Elastic modulus method, equi intensity cantilever method are the common methods in the measurement of resistance strain gage sensor; Wherein elastic modulus method is used morely in engineering, but measuring accuracy is not high, and the equi intensity cantilever method is commonly used in the laboratory measurement; Measuring accuracy is higher; But be not suitable for the measurement of big dependent variable, measurement range is comparatively narrow, is difficult to satisfy the measurement demand of big dependent variable in the current practical applications.
Summary of the invention
To above-mentioned shortcoming; The present invention adopts precise displacement sensor to combine Fibre Optical Sensor to make the mode of fibre strain standard component; Length is traceable in strain, and measuring accuracy can be guaranteed, for current Fibre Optical Sensor calibration measurement provides a kind of convenient, accurate service.
One of the object of the invention is realized through following technical scheme:
This method adopts displacement-measurement procedure, and the mode production standard that precise displacement sensor and Fibre Optical Sensor are combined transmits part generation standard dependent variable, reaches the calibration to Fibre Optical Sensor, fiber grating strain parameter indirectly.Fibre strain is transmitted part and is mainly comprised " recessed " font optics support, standard fiber sensor, precise displacement sensor, displacement transducer controller etc." recessed " font optics support is made up of optics slide rail guide groove, stiff end, free end." V " shape groove is carved with in free end, stiff end top.The base of displacement transducer and slide rail are by bolt, and transversely the free end with the optics support is connected, and are connected with the displacement transducer controller through data line.
After at first standard fiber sensor to be measured being pasted end-grain cutting stripping, cleaning pretreatment, the bare fibre surface sticks on above " V " shape groove of optics support.Adhesive is generally selected the bigger chemical reagent of Young modulus such as adopting epoxy resin, cyanoacrylate adhesive for use.In the taping process, Fibre Optical Sensor is unstressed naturally, guarantees that the optical fiber of pasting transmits the part axial deviation along fibre strain and is no more than 0.1mm.
Move the stretching optical fiber sensor through displacement transducer system operation interface control displacement transducer, precise displacement sensor is the N216.2A displacement actuator that general love nanometer displacement technology company limited (PI) makes, and stepping accuracy can reach 10nm.In tensile elongation is under the situation of Δ L, and according to the strain definition, the external strain that displacement transducer applies to Fibre Optical Sensor is Δ L/L.One end of Fibre Optical Sensor links to each other with the Fibre Optical Sensor stress test equipment; The strain and the theoretical value Δ L/L of optical fiber compare in the drawing process that the strain testing instrument is tested; Reach measurement and calibration, the dependent variable of other Fibre Optical Sensor is measured calibration through transmission of quantity value to the Fibre Optical Sensor stress test equipment.
In the invention, the standard fiber Selection of Sensor is most important to having obtained of standard dependent variable.For fiber-optic grating sensor (FBG), require the reflectance spectrum of selected standard FBG comparatively stable, long-term (1h) stability of centre wavelength is no more than 1pm.Fibre Optical Sensor (fiber optic loop) based on the Brillouin scattering formula; The calibration steps of strain parameter and FBG are similar basically; Select for use the comparatively stable polarization-maintaining fiber coil of temperature performance as standard component, Brillouin scattering formula stress analysis appearance injects pump light at the standard fiber two ends, exciting light carries out the strain calibration.
Description of drawings
Below in conjunction with accompanying drawing specific embodiment of the present invention is done further detailed explanation.
Fig. 1 beam of uniform strength
The part structural drawing is transmitted in Fig. 2 fibre strain
Wherein: 1--stiff end, 2-" recessed " word optics support, 3-standard fiber sensor, 4-free end, 5-precise displacement sensor, 6-draw direction
Embodiment
Below will combine accompanying drawing, the preferred embodiments of the present invention will be carried out detailed description; Should be appreciated that preferred embodiment has been merely explanation the present invention, rather than in order to limit protection scope of the present invention.
This method adopts displacement-measurement procedure, and the mode production standard that precise displacement sensor and Fibre Optical Sensor are combined transmits part generation standard dependent variable, reaches the calibration to Fibre Optical Sensor, fiber grating strain parameter indirectly.Fibre strain is transmitted part and is mainly comprised " recessed " font optics support 2, standard fiber sensor 3, precise displacement sensor 5, displacement transducer controller etc." recessed " font optics support 2 is made up of optics slide rail guide groove, stiff end 1, free end 4." V " shape groove is carved with in free end, stiff end top.The base of displacement transducer and slide rail are by bolt, and transversely the free end with the optics support is connected, and are connected with the displacement transducer controller through data line.
After at first standard fiber sensor to be measured being pasted end-grain cutting stripping, cleaning pretreatment, the bare fibre surface sticks on above " V " shape groove of optics support.Adhesive is generally selected the bigger chemical reagent of Young modulus such as adopting epoxy resin, cyanoacrylate adhesive for use.In the taping process, Fibre Optical Sensor is unstressed naturally, guarantees that the optical fiber of pasting transmits the part axial deviation along fibre strain and is no more than 0.1mm.
The standard fiber sensor is pasted on " recessed " word optics support; Move the stretching optical fiber sensor through displacement transducer system operation interface control displacement transducer; Precise displacement sensor is the N216.2A displacement actuator that general love nanometer displacement technology company limited (PI) makes, and stepping accuracy can reach 10nm.In tensile elongation is under the situation of Δ L, and according to the strain definition, the external strain that displacement transducer applies to Fibre Optical Sensor is Δ L/L.One end of Fibre Optical Sensor links to each other with Fibre Optical Sensor strain testing instrument through the joints of optical fibre; The strain stress and the theoretical value Δ L/L of optical fiber compare in the drawing process that the strain testing instrument is tested; Reach measurement and calibration, treat the dependent variable of photometry fiber sensor through transmission of quantity value and measure calibration Fibre Optical Sensor strain testing instrument.
In the invention, the standard fiber Selection of Sensor is to the crucial effects of having obtained of standard dependent variable.For fiber-optic grating sensor (FBG), require the reflectance spectrum of selected standard FBG comparatively stable, long-term (1h) stability of centre wavelength is no more than 1pm.Fibre Optical Sensor (fiber optic loop) based on the Brillouin scattering formula; The calibration steps of strain parameter and FBG are similar basically; Select for use the comparatively stable polarization-maintaining fiber coil of temperature performance as standard component, Brillouin scattering formula stress analysis appearance injects pump light at the standard fiber two ends, exciting light carries out the strain calibration.
Claims (3)
1. Calibration Method to Fibre Optical Sensor, fiber grating strain parameter; Adopt displacement-measurement procedure; The mode production standard that precise displacement sensor and Fibre Optical Sensor are combined transmits part and produces the standard dependent variable, reaches the calibration to Fibre Optical Sensor, fiber grating strain parameter indirectly, it is characterized in that; Standard is transmitted part and is comprised " recessed " font optics support, standard fiber sensor, precise displacement sensor, displacement transducer controller; " recessed " font optics support is made up of optics slide rail guide groove, stiff end, free end, and " V " shape groove is carved with in free end, stiff end top, and the base of displacement transducer and slide rail are by bolt; Transversely the free end with the optics support is connected, and is connected with the displacement transducer controller through data line.
2. a kind of Calibration Method as claimed in claim 1 to Fibre Optical Sensor, fiber grating strain parameter; It is characterized in that: described calibration process is for after pasting end-grain cutting stripping, cleaning pretreatment with selected standard fiber sensor; The bare fibre surface sticks on above " V " shape groove of optics support with adhesive; Move the stretching optical fiber sensor through displacement transducer system operation interface control displacement transducer; One end of Fibre Optical Sensor links to each other with Fibre Optical Sensor strain testing instrument, and the strain stress and the external contingency theory value Δ L/L of optical fiber compare in the drawing process that the strain testing instrument is tested.Completion is carried out the calibration of strain parameter with the Strain Analysis System transmission of quantity value after the calibration to Fibre Optical Sensor again to the measurement and calibration of strain analysis instrument.
3. a kind of Calibration Method as claimed in claim 2 to Fibre Optical Sensor, fiber grating strain parameter; It is characterized in that: said adhesive is generally selected the bigger chemical reagent of Young modulus such as adopting epoxy resin, cyanoacrylate adhesive for use; In the taping process; Fibre Optical Sensor is unstressed naturally, guarantees that the optical fiber of pasting transmits the part axial deviation along fibre strain and is no more than 0.1mm.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103105138A (en) * | 2013-01-08 | 2013-05-15 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber bragg grating strain sensitivity calibration device and method |
| CN103344192A (en) * | 2013-06-27 | 2013-10-09 | 中国电子科技集团公司第四十一研究所 | Long-distance large-range optical fiber strain generating device and generating method |
| CN103673913A (en) * | 2013-12-13 | 2014-03-26 | 中国电子科技集团公司第四十一研究所 | Novel fiber optic strain sensor and mounting method thereof |
| CN105783764A (en) * | 2016-05-30 | 2016-07-20 | 中国船舶重工集团公司第七0四研究所 | Fiber bragg grating strain sensor calibrating device |
| CN106679610A (en) * | 2016-12-14 | 2017-05-17 | 中国燃气涡轮研究院 | High temperature and high frequency cyclic alternating strain loading device |
| CN106871810A (en) * | 2017-03-28 | 2017-06-20 | 北京金风科创风电设备有限公司 | Calibration method, device and system of fiber grating strain sensor |
| CN107941163A (en) * | 2017-12-22 | 2018-04-20 | 中国地质大学（武汉） | A kind of fully distributed fiber coefficient of strain caliberating device and method |
| CN108362217A (en) * | 2018-04-25 | 2018-08-03 | 中国计量大学 | Brillouin light fiber sensor system strains calibrating installation and calibration method |
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
| CN111288955A (en) * | 2020-03-07 | 2020-06-16 | 中国计量科学研究院 | Integrated strain calibration system |
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| CN103105138A (en) * | 2013-01-08 | 2013-05-15 | 中国航空工业集团公司北京长城计量测试技术研究所 | Fiber bragg grating strain sensitivity calibration device and method |
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| CN106679610A (en) * | 2016-12-14 | 2017-05-17 | 中国燃气涡轮研究院 | High temperature and high frequency cyclic alternating strain loading device |
| CN106871810A (en) * | 2017-03-28 | 2017-06-20 | 北京金风科创风电设备有限公司 | Calibration method, device and system of fiber grating strain sensor |
| CN107941163A (en) * | 2017-12-22 | 2018-04-20 | 中国地质大学（武汉） | A kind of fully distributed fiber coefficient of strain caliberating device and method |
| CN107941163B (en) * | 2017-12-22 | 2019-07-23 | 中国地质大学（武汉） | A kind of fully distributed fiber coefficient of strain caliberating device and method |
| CN108362217A (en) * | 2018-04-25 | 2018-08-03 | 中国计量大学 | Brillouin light fiber sensor system strains calibrating installation and calibration method |
| CN109211302A (en) * | 2018-09-29 | 2019-01-15 | 北京菲斯罗克光电技术有限公司 | Calibration device, calibration system and the scaling method of naked FBG strain transducer |
| CN109211302B (en) * | 2018-09-29 | 2024-03-19 | 株洲菲斯罗克光电科技股份有限公司 | Calibration method of calibration system of bare FBG strain sensor |
| CN111288955A (en) * | 2020-03-07 | 2020-06-16 | 中国计量科学研究院 | Integrated strain calibration system |
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