CN204535885U - A kind of non-metallic fiber grating pyrostat - Google Patents
A kind of non-metallic fiber grating pyrostat Download PDFInfo
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- CN204535885U CN204535885U CN201520167803.6U CN201520167803U CN204535885U CN 204535885 U CN204535885 U CN 204535885U CN 201520167803 U CN201520167803 U CN 201520167803U CN 204535885 U CN204535885 U CN 204535885U
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Abstract
The utility model discloses a kind of non-metallic fiber grating pyrostat, adopt the encapsulation of internal layer capillary glass sleeve pipe, outer ceramic package sleeve pipe twice packing forms, fill lotion in two sleeve pipes, fiber grating affects by capillary glass encapsulation sleeve pipe fixed stress and there is initial strain.Its method for making comprises two large steps: once encapsulate fiber grating with capillary glass encapsulation sleeve pipe, then carry out secondary encapsulation with thermal conductive ceramic sleeve pipe to fiber grating.Temperature Optic Fiber Grating Sensor essential safety disclosed in the utility model, there is good electromagnetism interference and heat conductivility, eliminate the impact because material thermal stress produces measurement result simultaneously, improve measuring accuracy, the thermometric under high voltage environment can be widely used in.
Description
Technical field
The utility model relates to a kind of temperature sensor based on fiber grating, especially a kind of temperature sensor of non-metallic fiber grating of thermometric under high voltage environment, belongs to fiber grating sensing technology field.
Background technology
China's electric system is in recent years just towards the future development of high power capacity, high voltage, large-sized unit, increasing transformer station all to carry out management mode that is unattended and comprehensive automation, this management mode proposes more strict requirement for stable, the safe operation of the equipment such as high-tension switch cabinet, and the parameters such as the insulativity of these device elements, ageing rate are all relevant with temperature, in the urgent need to effectively monitoring device temperature, to improve stability and the security of equipment.The mode of traditional measuring tempeature as infrared measurement of temperature, thermal resistance, thermopair all cannot meet electric system in real time, insulation, the thermometric such as electromagnetism interference and essential safety requirement.
As a kind of novel temperature probe, adopt fiber-optical grating temperature sensor to carry out temperature survey to have that precision is high, volume is little, electromagnetism interference, radioresistance, in real time accurately location, essential safety and can the features such as accurate distribution measuring be realized, can the temperature of effective watch-dog, be widely used in power domain, especially some high pressure, high temperature place.Because optical fiber raster bare grid are more fragile, generally fiber grating is encapsulated in engineer applied, to reach the object of protection fiber grating.The electric power fiber-optical grating temperature sensor reported at present, the general single-layer ceramic sleeve pipe that adopts encapsulates, or the inner metal sleeve that adopts once encapsulates, then carries out secondary encapsulation with porcelain bushing.But because the encapsulating materials such as metal are different from the thermal expansivity of fiber optic materials, when the temperature increases, can there is thermal stress effects, although play sensitization, the strain caused of surrounding enviroment will be delivered to fiber grating by metal.Because grating Bragg wavelength is mutual responsive to strain and stress, namely when temperature and strain exist simultaneously, cannot the respective contribution of resolved temperature and strain.Therefore, by mutual responsive impact, current existing packaged type directly reduces temperature measurement accuracy.In addition, under the high temperature conditions, also there is poor reliability, be subject to the deficiencies such as electromagnetic interference (EMI) in Materials for Metal Packaging.
Summary of the invention
For above deficiency, the utility model provides a kind of non-metallic fiber pyrostat, solves existing fiber pyrostat and is subject to the interference of extraneous stress and strain and causes measuring accuracy to decline and poor reliability, be subject to the technical matters of electromagnetic interference (EMI).
The technical solution of the utility model is as follows:
A kind of non-metallic fiber grating pyrostat, comprises fiber grating, also comprises capillary glass encapsulation sleeve pipe, ceramic package sleeve pipe, fills lotion, the first sleeve fixing part and the second sleeve fixing part; Fiber grating is positioned at capillary glass encapsulation sleeve pipe, and is fixed by tackifier with the two ends that capillary glass encapsulates sleeve pipe, and fiber grating affects by two ends fixed stress and there is initial strain; Capillary glass encapsulation sleeve pipe outer package has ceramic package sleeve pipe, and be full of filling lotion between capillary glass encapsulation sleeve pipe and ceramic package sleeve pipe, two sleeve pipes connect the first sleeve fixing part and the second sleeve fixing part respectively along the two ends of its axis; First sleeve fixing part and the second sleeve fixing part have through hole vertically in its cross-section center, and fiber grating is each passed through the through hole in the first sleeve fixing part and the second sleeve fixing part.
As preferred version of the present utility model, fiber grating 1 initial strain is 500 μ ε.
As preferred version of the present utility model, the adhesive material that capillary glass encapsulation sleeve pipe two ends are fixed fiber grating and seal is epoxide-resin glue.
As preferred version of the present utility model, the first sleeve fixing part, the second sleeve fixing part are connected by epoxide-resin glue with ceramic package sleeve pipe.
As preferred version of the present utility model, filling ointment material is heat conductive silica gel.
As preferred version of the present utility model, the first sleeve fixing part and the second sleeve fixing part have away from capillary glass package cover pipe end the cylindrical boss stretched out vertically away from cover.
The beneficial effects of the utility model are as follows:
(1) select the glass with good insulativity and thermal conductivity and pottery two kinds of nonmetallic materials, essential safety, has good electromagnetism interference and heat conductivility;
(2) material of the capillary glass encapsulation sleeve pipe selected is silicon dioxide, and itself and fiber grating have close thermal expansivity, eliminate the impact because material thermal stress produces measurement result cleverly, improve measuring accuracy.
Accompanying drawing explanation
Fig. 1 is non-metallic fiber grating pyrostat structural representation
Fig. 2 is that non-metallic fiber grating pyrostat once encapsulates schematic diagram
Fig. 3 is non-metallic fiber grating pyrostat secondary encapsulation schematic diagram
Embodiment
Be easier to for making those skilled in the art understand the technical solution of the utility model, the structure of non-metallic fiber grating pyrostat of the present utility model, method for making and principle are described.
Non-metallic fiber grating pyrostat described in the present embodiment, adopt double-deck non-metallic casing packing forms, comprise fiber grating 1, capillary glass encapsulation sleeve pipe 2, ceramic package sleeve pipe 4, fill lotion 3, first sleeve fixing part 5 and the second sleeve fixing part 6; Fiber grating 1 is unsettled is positioned at capillary glass encapsulation sleeve pipe 2, and encapsulate the two ends of sleeve pipe 2 fixing at two stiff ends 7 by tackifier with capillary glass, and fiber grating 1 exists initial strain 500 μ ε by two stiff end 7 stress influences; Capillary glass encapsulation sleeve pipe 2 covering is equipped with ceramic package sleeve pipe 4, between capillary glass encapsulation sleeve pipe 2 and ceramic package sleeve pipe 4, filling lotion 3, two sleeve pipe of falling heat-transfer silica gel material connects the first sleeve fixing part 5 and the second sleeve fixing part 6 along the two ends of its axis respectively by epoxide-resin glue; First sleeve fixing part and the second sleeve fixing part have through hole vertically in its cross-section center, and fiber grating 1 is each passed through the through hole in the first sleeve fixing part 5 and the second sleeve fixing part 6; First sleeve fixing part 5 and the second sleeve fixing part 6 have away from capillary glass encapsulation sleeve pipe 2 end cylindrical boss 5a and 6a stretched out vertically away from cover.
The making of the non-metallic fiber grating pyrostat described in the present embodiment is divided into two large steps: first once encapsulate with capillary glass encapsulation sleeve pipe 2 pairs of fiber gratings 1; Secondary encapsulation is carried out with thermal conductive ceramic sleeve pipe 4 pairs of fiber gratings 1.
Figure 2 shows that fiber grating once encapsulates schematic diagram, first by the epoxide-resin glue mixed up and the capillary glass encapsulation sleeve pipe crossed through alcohol washes and fiber grating for subsequent use, then fiber grating is penetrated in glass capillary, and ensure the unsettled centre position being positioned at capillary glass encapsulation sleeve pipe of fiber grating, now, be pasted onto on the fixed station of micromotion platform by fiber grating tail optical fiber one end Instant cement, the other end is pasted onto on the transfer table of micromotion platform.Regulate displacement platform, to fiber grating Shi Hanzhang, ensure that fiber grating initial strain is 500 μ ε, ensure that the state of fiber grating is constant, with the epoxide-resin glue prepared, capillary glass is encapsulated the two ends sealing of sleeve pipe, and be placed on room temperature environment (10 DEG C ~ 30 DEG C) solidification (room temperature is 10 DEG C ~ 30 DEG C) in lower 24 hours, after epoxy glue solidification, once packaged fiber grating is taken off for subsequent use.
Figure 3 shows that fiber grating secondary encapsulation schematic diagram, first by for subsequent use to the epoxide-resin glue mixed up and the fixture crossed through alcohol washes, ceramic sleeve pipe and the fiber grating once after encapsulation, then by once encapsulation after fiber grating one end penetrate fixture, and be inserted into one end of thermal conductive ceramic sleeve pipe, ensure that fiber grating is positioned in the middle of thermal conductive ceramic sleeve pipe simultaneously, extract heat conductive silica gel with syringe again to inject at the other end of thermal conductive ceramic sleeve pipe, injection process will ensure that speed is slow, bubble-free.After heat conductive silica gel is filled, fixture is inserted into the other end of thermal conductive ceramic sleeve pipe.With epoxy glue, fixture is bonding with thermal conducting sleeve.And solidify 24 hours under room temperature environment (10 DEG C ~ 30 DEG C).
In the utility model, electric power non-metallic fiber grating pyrostat adopts capillary glass sleeve pipe once to encapsulate fiber grating, due to the similar thermal expansion coefficient of fiber grating and glass, is 0.5 × 10-6/K ~ 0.6 × 10-6/K.When the temperature increases, fiber grating by the impact of capillary glass encapsulation sleeve pipe thermal stress, can not eliminate because temperature elevated material thermal stress, on the impact of fiber grating, improves measuring accuracy.
In routine use, vibratory impulse can make optical fiber raster vibration, causes bragg reflection wavelength to change on the impact of measurement result generation.Carrying out bonding when encapsulating sleeve pipe two ends with capillary glass under the condition of fiber grating at Shi Hanzhang, ensure that both relative positions are constant, can effectively eliminate because vibratory impulse is on the impact produced measurement result, improve the repeatability index of sensor.In addition, if without prestress encapsulation, when the temperature is changed, glass capillary two ends epoxy glue expands with heat and contract with cold and both relative positions also can be caused to change, and through experimental study, when applying 500 μ ε to fiber grating, effect is good.
Thermal conductive ceramic sleeve pipe is adopted to carry out secondary encapsulation; the good zirconia of the material selection electromagnetism interference of thermal conductive ceramic sleeve pipe, rigidity, insulativity, thermal conductivity; its coefficient of heat conductivity is about 5W/m.K; the available protecting to once encapsulating can being realized, eliminating the effect that heat conductive insulating is played again in external force impact.Filling heat conductive silica gel between two sleeve pipes, is conducive to temperature and is delivered to fiber grating fast, improves the response time of sensor.Ceramic pipe two ends adopt fixture to seal the position fixed between two encapsulation sleeve pipes, prevent heat conductive silica gel from flowing out, and ensure the position between two encapsulation sleeve pipes.First sleeve fixing part 5 and the second sleeve fixing part 6 have away from capillary glass encapsulation sleeve pipe 2 end cylindrical boss 5a and 6a stretched out vertically away from cover; when the later stage connects fiber optic cable production fibre-optical splice, be convenient to mould the parts such as cover, sleeve, protective casing and be connected with sensor.
Glass (silicon dioxide) is adopted sensor package both to be met to the feature of electromagnetism interference and essential safety with pottery (zirconia) two kinds of nonmetallic materials, there is again good thermal conductivity, make sensor have the response time faster, be applicable to temperature monitoring in power equipment.
The foregoing is only embodiment of the present utility model; not thereby the scope of the claims of the present utility model is limited; every utilize the utility model instructions and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (6)
1. a non-metallic fiber grating pyrostat, comprise fiber grating (1), characterized by further comprising capillary glass encapsulation sleeve pipe (2), ceramic package sleeve pipe (4), fill lotion (3), the first sleeve fixing part (5) and the second sleeve fixing part (6); Fiber grating (1) is positioned at capillary glass encapsulation sleeve pipe (2), two ends (the 2a of sleeve pipe (2) is encapsulated with capillary glass, 2b) fixed by tackifier and seal, initial strain is there is in fiber grating (1) by the impact of two ends (2a, 2b) fixed stress; Capillary glass encapsulation sleeve pipe (2) covering is equipped with ceramic package sleeve pipe (4), be full of between capillary glass encapsulation sleeve pipe (2) and ceramic package sleeve pipe (4) and fill lotion (3), two sleeve pipes connect the first sleeve fixing part (5) and the second sleeve fixing part (6) respectively along the two ends of its axis; First sleeve fixing part and the second sleeve fixing part have through hole vertically in its cross-section center, and fiber grating (1) is each passed through the through hole in the first sleeve fixing part (5) and the second sleeve fixing part (6).
2. non-metallic fiber grating pyrostat as claimed in claim 1, is characterized in that fiber grating (1) initial strain is 500 μ ε.
3. the non-metallic fiber grating pyrostat as described in any one of claim 1 or 2, it is characterized in that capillary glass encapsulation sleeve pipe (2) two ends (2a, 2b) is epoxide-resin glue to the adhesive material that fiber grating (1) is fixed and seals.
4. the non-metallic fiber grating pyrostat as described in any one of claim 1 or 2, is characterized in that the first sleeve fixing part (5), the second sleeve fixing part (6) is connected by epoxide-resin glue with ceramic package sleeve pipe (4).
5. non-metallic fiber grating pyrostat as claimed in claim 1 or 2, is characterized in that filling lotion (3) material is heat conductive silica gel.
6. non-metallic fiber grating pyrostat as claimed in claim 1 or 2, is characterized in that the first sleeve fixing part (5) and the second sleeve fixing part (6) have away from capillary glass encapsulation sleeve pipe (2) end the cylindrical boss (5a) and (6a) that stretch out vertically away from cover.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520167803.6U CN204535885U (en) | 2015-03-24 | 2015-03-24 | A kind of non-metallic fiber grating pyrostat |
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| CN201520167803.6U CN204535885U (en) | 2015-03-24 | 2015-03-24 | A kind of non-metallic fiber grating pyrostat |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729752A (en) * | 2015-03-24 | 2015-06-24 | 中国电子科技集团公司第八研究所 | Non-metal fiber grating high temperature sensor and manufacturing method thereof |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN112798140A (en) * | 2020-12-23 | 2021-05-14 | 成都伊莱特光测科技有限公司 | Hydraulic turbine rotor signal extraction device and system based on optical fiber sensing |
-
2015
- 2015-03-24 CN CN201520167803.6U patent/CN204535885U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104729752A (en) * | 2015-03-24 | 2015-06-24 | 中国电子科技集团公司第八研究所 | Non-metal fiber grating high temperature sensor and manufacturing method thereof |
| CN110044288A (en) * | 2019-04-03 | 2019-07-23 | 西北工业大学 | High temperature resistant strain transducer based on FBG |
| CN112798140A (en) * | 2020-12-23 | 2021-05-14 | 成都伊莱特光测科技有限公司 | Hydraulic turbine rotor signal extraction device and system based on optical fiber sensing |
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