CN105241573A - Laser-welding fiber grating surface temperature sensor and packaging method thereof - Google Patents
Laser-welding fiber grating surface temperature sensor and packaging method thereof Download PDFInfo
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- CN105241573A CN105241573A CN201510706420.6A CN201510706420A CN105241573A CN 105241573 A CN105241573 A CN 105241573A CN 201510706420 A CN201510706420 A CN 201510706420A CN 105241573 A CN105241573 A CN 105241573A
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Abstract
The invention provides a laser-welding fiber grating surface temperature sensor which comprises a fiber, a metal substrate and a bottomless nonmetal framework. The fiber comprises a fiber grating plated with a metal layer and signal transmission tail fibers at the two sides of the fiber grating. The two ends of the fiber grating are fixed to the metal substrate through laser welding; the signal transmission tail fibers are respectively sleeved by a fiber protection sleeve pipe; the bottom portion of the nonmetal framework is fixed to the metal substrate; the nonmetal framework is provided with through holes for allowing the fiber protection sleeve pipes to pass through; and the nonmetal framework is internally filled with paste-like heat-conduction silicone grease. The fiber grating is subjected to coating layer removing and metal film layer plating, and is then, fixed to the metal substrate through the laser welding method, thereby realizing full metal packaging of a temperature sensing portion of the whole sensor, and overcoming creep and aging of adhesives in a conventional adhesive substrate fiber grating temperature sensor; and compared with glass welding, the laser-welding fiber grating surface temperature sensor has higher mechanical strength, and can bear higher test temperature; and fiber grating object surface temperature measurement long-term reliability and stability are improved on the whole.
Description
Technical field
The invention belongs to sensory field of optic fibre, be specifically related to a kind of fiber grating surface temperature sensor and method for packing thereof of laser bonding.
Background technology
The surface temperature of Measurement accuracy object is needed at a lot of engineer applied and scientific research occasion, as the temperature survey of moulding plastics mould inner surface, the measurement of key structure part surface temperature in aeroengine test run test, the measurement etc. of machine tool table surface temperature in numerical control machining tool heat error research.Traditional body surface temperature survey sensing technology is mainly adhesive type or gasket type thermopair, thermal resistance technology and contactless infrared temperature-test technology.Thermopair and thermal resistance are electric detecting technology, and environmental suitability is poor, and anti-electromagnetic interference capability is weak, and signal transmission wire is various, and reliability is poor; Infrared temperature-test technology is a kind of temperature test technology of two dimensional surface imaging, energy display object surface directly perceived temperature, but expensive, requires high, and be difficult to the overall three dimensional temperature field measurement realizing heavy construction structure to environment for use.
Fiber grating is a kind of optical sensor, since coming out, has become the emerging important branch of of sensor technology through the development of more than 30 years from 1978.Fiber grating volume is little, lightweight, precision is high, particularly compared with traditional electrical sensor, have corrosion-resistant, explosion-proof, to electrical isolation, electromagnetism interference, advantages such as good environmental adaptability, and the distributed measurement of multiple spot multiparameter and long-term remote condition monitoring can be realized.Therefore, obtain applying more and more widely in many field of engineering technology.
Optical fiber grating temperature-measuring technology is the branch be most widely used in current fiber grating sensing technology.Wherein studying fiber-optical grating temperature sensor is the most widely metal pipe type fiber-optical grating temperature sensor, and this encapsulating structure is mainly used in the measurement of engineering structure environment temperature, is difficult to the high-acruracy survey of competent body surface temperature.The fiber-optical grating temperature sensor of base chip package reaches better with testee surface energy and contacts, the measurement being applied to body surface temperature is more reasonable, it mainly adopts epoxide-resin glue bare optical fibers and bare optical gratings to be fixed on the larger substrate of expansion coefficient to carry out enhanced sensitivity, then substrate is directly fixed on testee surface, carry out surface temperature measurement (referring to document " InoueA, ShigeharaM, ItoM, etal.FabricationandapplicationoffiberBragggrating-arevie w [J] .Optoelectron.Dev.Technol, 1995, 1 (10): 30-119 ", document " ToruMizunanti, HiroakiTatehataand, HideoKawashima.High-sensitivitycryogenicfiber-Bragg-grat ingtemperaturesensorsusingTeflonsubstrates [J] .Meas.Sci.Technol, 2001,12 (7): 914-917 ", document " Zhan Yage, Cai Haiwen, Xiang Shiqing. the research [J] of High Resolution Fiber Bragg Grating Temperature Sensor. Chinese laser, 2005,32 (1): 83-86 ", document " Zhou Guopeng. fiber Bragg grating sensor encapsulation and strain/temperature isolation technics [D]. Nanjing: Nanjing Aero-Space University, 2005 ").There is a lot of defect in existing substrate formula fiber-optical grating temperature sensor: (1) fiber grating is fixed on metal substrate by epoxy resin adhesive, easily creep and aging in long-term work after epoxy resin adhesive solidification, the drift of fiber bragg grating center wavelength can be caused, bring test error, reduce the reliability that fiber-optical grating temperature sensor is measured for a long time.The patent No. is that the Chinese invention patent " the optical fiber grating high-sensitivity temperature sensor based on low-melting glass welding " of 201310017991.X uses low-melting glass welding to be fixed on metallic matrix by fiber grating, this method eliminates viscose glue creep and aging impact, but glass solder is the welding of a kind of low melting point, when senor operating temperature is higher, glass solder joint easily softens, and affects testing reliability, and glass solder joint is more crisp, easily break, sensor is fragile, and reliability is poor; (2) temperature field of testee near surface often has larger thermograde in the normal direction, under physical environment, larger (about 60 DEG C of the temperature difference of testee and environment temperature, experiment test value), larger (about-20 DEG C/mm of testee near surface thermograde, experiment test value), conventional substrate formula fiber-optical grating temperature sensor, in so large thermograde, is difficult to the accurate measurement realizing object surface temperature; (3) tail optical fiber at fiber grating two ends is subject to the impact of external disturbance, and the disturbance of external signal Transmission Fibers is easily delivered on fiber grating and metal substrate, and the atural beat affecting metal substrate and fiber grating expands, and brings larger interference and test error.Therefore, traditional substrate formula fiber-optical grating temperature sensor is difficult to monitoring object surface temperature reliably and with long-term, in the urgent need to designing the high fiber grating surface temperature sensor encapsulating structure of a kind of reliability and corresponding method for packing.
Summary of the invention
The technical problem to be solved in the present invention is: the fiber grating surface temperature sensor and the method for packing thereof that provide a kind of laser bonding, realize the monitoring reliably and with long-term to body surface temperature.
The present invention for solving the problems of the technologies described above taked technical scheme is: a kind of fiber grating surface temperature sensor of laser bonding, is characterized in that: it comprises optical fiber, metal substrate and bottomless nonmetal framework; Described optical fiber comprises the fiber grating being coated with metal level and the Signal transmissions tail optical fiber being positioned at fiber grating both sides, and the two ends being coated with the fiber grating of metal level are fixed on metal substrate by laser bonding, and Signal transmissions tail optical fiber overcoat protects fiber coating pipe; Nonmetal base of frame and described metal substrate are fixed, and nonmetal framework is provided with for protecting the through hole that fiber coating pipe passes through, and nonmetal lower portion is filled with paste heat-conducting silicone grease.
By such scheme, the half slot being coated with the fiber grating of metal level described in accommodation is carved with at the middle part of described metal substrate, and the half slot protecting fiber coating pipe described in accommodation is carved with at the two ends of metal substrate.
By such scheme, in the middle part of metal substrate both sides overhanging arm on be carved with counterbore, for being close to by lock-screw and testee.
As the method for packing of the fiber grating surface temperature sensor of above-mentioned laser bonding, it is characterized in that: it comprises the following steps:
S1, fiber grating removed coat, deoil, plating one deck has certain thickness metal level;
S2, the fiber grating being coated with metal level is applied certain pretightning force, be fixed in the middle of metal substrate with fixture, adopt the mode of laser bonding to be welded on metal substrate by the fiber grating two ends being coated with metal level;
S3, the Signal transmissions tail optical fiber being coated with the two ends of the fiber grating of metal level is inserted in two respectively protects in fiber coating pipe, and be fixed on metal substrate near one end of fiber grating by bonding agent by protecting fiber coating pipe;
S4, metal substrate to be fixedly connected with nonmetal base of frame;
S5, two are protected fiber coating pipe respectively after prebuckling certain angle, pass from the through hole of nonmetal framework both sides respectively, be fixed on nonmetal framework by bonding agent, this section ensureing between metal substrate to nonmetal framework in operating process is protected fiber coating pipe and is in relaxed state;
S6, after coated on bottom side one deck heat-conducting silicone grease of metal substrate, be close to testee surface, nonmetal framework surrounding is fixed on testee surface by bonding agent;
S7, at nonmetal lower portion, metal substrate upper surface fills full paste heat-conducting silicone grease.
As stated above, in described S2, the fiber grating fixture being coated with metal level is fixed in the half slot in the middle part of metal substrate; In described S3, be fixed on protecting fiber coating pipe in the half slot at metal substrate two ends by bonding agent near one end of fiber grating.
As stated above, in described S4, the overhanging arm of both sides, metal substrate middle part is clamped on the deep gouge of nonmetal base of frame.
As stated above, it also comprises S8, after the bonding agent of nonmetal framework surrounding solidifies completely, tightens lock-screw, makes metal substrate be close to testee surface.
Beneficial effect of the present invention is:
1, fiber grating is removed coat and metal-coated membrane, then be fixed on metal substrate by the method for laser bonding, achieve the all-metalization encapsulation of whole sensor temperature transducing part, the solder joint of laser bonding can control very little, is highly suitable for the welding of this small parts of fiber grating, and laser bonding adopts laser emission heated parts surface simultaneously, make work pieces meld, form specific molten bath, without the need to other solder, it is very good that solder joint place metal recovers solid-state rear adhesion.Which overcome the creep of viscose glue in traditional gluing substrate formula fiber-optical grating temperature sensor and aging, also than glass solder, there is higher physical strength, higher probe temperature can be born, improve long-term reliability and stability that fiber grating measures body surface temperature on the whole, thus realize the monitoring reliably and with long-term to body surface temperature.
2, the filling of paste heat-conducting silicone grease reduces the thermal contact resistance between metal substrate and testee surface, reduces the thermograde at tested position simultaneously, forms a relatively uniform and stable temperature field, improves the thermometric accuracy of body surface.
3, the mounting means on nonmetal framework is fixed in employing both sides, metal substrate middle part, the Free Thermal that the thermal expansion of nonmetal framework and the thermal deformation of testee can not affect base panel length direction (i.e. fiber grating axial direction) stretches, simultaneously, protecting fiber coating pipe is fixed on metal substrate, be fixed on again after prebuckling on nonmetal framework, this dual fixing mode reduces the impact of disturbance on substrate of sensor external optical fiber, improves the performance of the anti-external disturbance of sensor.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the A-A cut-open view of Fig. 1.
Fig. 3 is the B-B cut-open view of Fig. 1.
Fig. 4 is the upward view of Fig. 1.
In figure: the nonmetal framework of 1-, 2-paste heat-conducting silicone grease, 3-laser solder joint, 4-fiber grating, 5-lock-screw, 6-metal substrate, 7-bonding agent, 8-protects fiber coating pipe, 9-testee.
Embodiment
Below in conjunction with instantiation and accompanying drawing, the invention will be further described.
Fig. 1 is the structural representation of one embodiment of the invention, Fig. 2 is the A-A cut-open view of Fig. 1, and Fig. 3 is the B-B cut-open view of Fig. 1, and Fig. 4 is the upward view of Fig. 1, a fiber grating surface temperature sensor for laser bonding, comprises optical fiber, metal substrate 6 and bottomless nonmetal framework 1; Described optical fiber comprises the fiber grating 4 being coated with metal level and the Signal transmissions tail optical fiber being positioned at fiber grating both sides, and the two ends being coated with the fiber grating 4 of metal level are fixed on metal substrate 6 by laser bonding, and Signal transmissions tail optical fiber overcoat protects fiber coating pipe 8; Fix with described metal substrate 6 bottom nonmetal framework 1, and nonmetal framework 1 is provided with the through hole for protecting fiber coating pipe 8 and passing through, nonmetal framework 1 inside is filled with paste heat-conducting silicone grease 2.
Preferably, the half slot of the fiber grating 4 being coated with metal level described in accommodation is carved with at the middle part of described metal substrate 6, and the half slot protecting fiber coating pipe 8 described in accommodation is carved with at the two ends of metal substrate 6.
Further preferred, in the middle part of metal substrate 6 both sides overhanging arm on be carved with counterbore, for being close to by lock-screw 5 and testee 9.
As the method for packing of the fiber grating surface temperature sensor of above-mentioned laser bonding, comprise the following steps:
S1, fiber grating 4 is removed coat, deoils, plating one deck has certain thickness metal level;
S2, the fiber grating 4 being coated with metal level is applied certain pretightning force, be fixed in the middle of metal substrate 6 with fixture, adopt the mode of laser bonding to be welded on metal substrate 6 at fiber grating 4 two ends being coated with metal level, leaving laser solder joint 3 as shown in Figure 1, is very little as seen;
S3, the Signal transmissions tail optical fiber at the two ends being coated with the fiber grating 4 of metal level be inserted in two respectively protect in fiber coating pipe 8, and will fiber coating pipe 8 be protected near one end of fiber grating 4 by bonding agent 7(such as high-temperature plastic) be fixed on metal substrate 6;
S4, metal substrate 6 to be fixedly connected with bottom nonmetal framework 1;
S5, two are protected fiber coating pipe 8 respectively after prebuckling certain angle, pass from the through hole of nonmetal framework 1 both sides respectively, be fixed on nonmetal framework 1 by bonding agent 7, this section ensureing between metal substrate 6 to nonmetal framework 1 in operating process is protected fiber coating pipe 8 and is in relaxed state;
S6, after coated on bottom side one deck heat-conducting silicone grease of metal substrate 6, be close to testee 9 surface, nonmetal framework 1 surrounding by bonding agent 7 be fixed on testee 9 surface;
S7, inner at nonmetal framework 1, metal substrate 6 upper surface fills full paste heat-conducting silicone grease 2.
Preferably, in described S2, fiber grating 4 fixture being coated with metal level is fixed in the half slot in the middle part of metal substrate 6; In described S3, be fixed on protecting fiber coating pipe 8 in the half slot at metal substrate 6 two ends by bonding agent 7 near one end of fiber grating 4.
Preferably, in described S4, the overhanging arm of both sides, metal substrate 6 middle part is clamped on the deep gouge of nonmetal base of frame.
Preferred further, it also comprises S8, after the bonding agent 7 of nonmetal framework 1 surrounding solidifies completely, tightens lock-screw 5, makes metal substrate 6 be close to testee 9 surface.
In the present embodiment, metal substrate 6 choose thermal expansivity comparatively large, there is the higher metal material of the purity of good laser weldability, such as aluminium or copper.Metal level outside fiber grating 4 chooses copper or gold.
Traditional gluing substrate formula fiber-optical grating temperature sensor has just carried out enhanced sensitivity to optical fiber grating temperature-measuring, do not consider that it is to the thermometric accuracy of body surface and long-time stability and reliability, laser welding technology is adopted to be welded on metal substrate by the fiber grating two ends being coated with metal level, not only increase the sensitivity of optical fiber grating temperature-measuring, also improve the long-time stability of fiber-optical grating temperature sensor, reliability and serviceable life simultaneously; The filling of paste heat-conducting silicone grease, reduces the thermograde on testee surface, improves the accuracy that fiber-optical grating temperature sensor measures object surface temperature; The dual fixed form of protecting fiber coating pipe make substrate and fiber grating pair external disturbance insensitive, improve the antijamming capability of sensor.
Above embodiment is only for illustration of design philosophy of the present invention and feature, and its object is to enable those skilled in the art understand content of the present invention and implement according to this, protection scope of the present invention is not limited to above-described embodiment.So all equivalent variations of doing according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (7)
1. a fiber grating surface temperature sensor for laser bonding, is characterized in that: it comprises optical fiber, metal substrate and bottomless nonmetal framework; Described optical fiber comprises the fiber grating being coated with metal level and the Signal transmissions tail optical fiber being positioned at fiber grating both sides, and the two ends being coated with the fiber grating of metal level are fixed on metal substrate by laser bonding, and Signal transmissions tail optical fiber overcoat protects fiber coating pipe; Nonmetal base of frame and described metal substrate are fixed, and nonmetal framework is provided with for protecting the through hole that fiber coating pipe passes through, and nonmetal lower portion is filled with paste heat-conducting silicone grease.
2. the fiber grating surface temperature sensor of laser bonding according to claim 1, it is characterized in that: the half slot being coated with the fiber grating of metal level described in accommodation is carved with at the middle part of described metal substrate, the half slot protecting fiber coating pipe described in accommodation is carved with at the two ends of metal substrate.
3., according to the fiber grating surface temperature sensor of the laser bonding in claim 1 or 2 described in any one, it is characterized in that: in the middle part of metal substrate both sides overhanging arm on be carved with counterbore, for being close to by lock-screw and testee.
4. the method for packing of the fiber grating surface temperature sensor of laser bonding as claimed in claim 1, is characterized in that: it comprises the following steps:
S1, fiber grating removed coat, deoil, plating one deck has certain thickness metal level;
S2, the fiber grating being coated with metal level is applied certain pretightning force, be fixed in the middle of metal substrate with fixture, adopt the mode of laser bonding to be welded on metal substrate by the fiber grating two ends being coated with metal level;
S3, the Signal transmissions tail optical fiber being coated with the two ends of the fiber grating of metal level is inserted in two respectively protects in fiber coating pipe, and be fixed on metal substrate near one end of fiber grating by bonding agent by protecting fiber coating pipe;
S4, metal substrate to be fixedly connected with nonmetal base of frame;
S5, two are protected fiber coating pipe respectively after prebuckling certain angle, pass from the through hole of nonmetal framework both sides respectively, be fixed on nonmetal framework by bonding agent, this section ensureing between metal substrate to nonmetal framework in operating process is protected fiber coating pipe and is in relaxed state;
S6, after coated on bottom side one deck heat-conducting silicone grease of metal substrate, be close to testee surface, nonmetal framework surrounding is fixed on testee surface by bonding agent;
S7, at nonmetal lower portion, metal substrate upper surface fills full paste heat-conducting silicone grease.
5. method for packing according to claim 4, is characterized in that: in described S2, is fixed in the half slot in the middle part of metal substrate by the fiber grating fixture being coated with metal level; In described S3, be fixed on protecting fiber coating pipe in the half slot at metal substrate two ends by bonding agent near one end of fiber grating.
6. method for packing according to claim 4, is characterized in that: in described S4, is clamped on the deep gouge of nonmetal base of frame by the overhanging arm of both sides, metal substrate middle part.
7. according to the method for packing in claim 4 to 6 described in any one, it is characterized in that: it also comprises S8, after the bonding agent of nonmetal framework surrounding solidifies completely, tightens lock-screw, makes metal substrate be close to testee surface.
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Cited By (9)
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| CN106482657A (en) * | 2016-10-10 | 2017-03-08 | 武汉理工大学 | Fiber grating dynamic strain sensor-packaging structure and method |
| CN106644156A (en) * | 2016-10-28 | 2017-05-10 | 北京信息科技大学 | Fiber grating temperature sensor for measuring vacuum environment temperature |
| CN106840455A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | Suitable for the special-shaped substrate fiber-optic grating sensor under vacuum environment |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108132105A (en) * | 2017-12-25 | 2018-06-08 | 北京信息科技大学 | Strain insensitive metallization packaged temperature sensor |
| CN108199101A (en) * | 2017-12-27 | 2018-06-22 | 上海捷新动力电池***有限公司 | A kind of temperature sensor installation method and erecting device for battery modules |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating sensor |
| CN108844655A (en) * | 2018-04-20 | 2018-11-20 | 武汉中航传感技术有限责任公司 | A kind of fiber grating Temperature Humidity Sensor |
| CN112683185A (en) * | 2019-10-18 | 2021-04-20 | 三菱重工业株式会社 | Optical fiber detection device and method for detecting mechanical strain using optical fiber detection device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106482657A (en) * | 2016-10-10 | 2017-03-08 | 武汉理工大学 | Fiber grating dynamic strain sensor-packaging structure and method |
| CN106644156A (en) * | 2016-10-28 | 2017-05-10 | 北京信息科技大学 | Fiber grating temperature sensor for measuring vacuum environment temperature |
| CN106840455A (en) * | 2016-11-02 | 2017-06-13 | 北京信息科技大学 | Suitable for the special-shaped substrate fiber-optic grating sensor under vacuum environment |
| CN106840455B (en) * | 2016-11-02 | 2019-08-27 | 北京信息科技大学 | Suitable for the special-shaped substrate fiber-optic grating sensor under vacuum environment |
| CN108132105A (en) * | 2017-12-25 | 2018-06-08 | 北京信息科技大学 | Strain insensitive metallization packaged temperature sensor |
| CN107907069A (en) * | 2017-12-27 | 2018-04-13 | 北京信息科技大学 | A kind of substrate formula temperature strain measurement FBG sensor and performance test methods |
| CN108199101A (en) * | 2017-12-27 | 2018-06-22 | 上海捷新动力电池***有限公司 | A kind of temperature sensor installation method and erecting device for battery modules |
| CN108844655A (en) * | 2018-04-20 | 2018-11-20 | 武汉中航传感技术有限责任公司 | A kind of fiber grating Temperature Humidity Sensor |
| CN108838594A (en) * | 2018-08-23 | 2018-11-20 | 北京通为科技有限公司 | The encapsulating structure of fiber-optic grating sensor |
| CN108838594B (en) * | 2018-08-23 | 2023-10-27 | 北京通为科技有限公司 | Packaging structure of fiber Bragg grating sensor |
| CN112683185A (en) * | 2019-10-18 | 2021-04-20 | 三菱重工业株式会社 | Optical fiber detection device and method for detecting mechanical strain using optical fiber detection device |
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