CN204855053U - Fiber grating pressure sensor of pipeline pressure monitoring - Google Patents
Fiber grating pressure sensor of pipeline pressure monitoring Download PDFInfo
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- CN204855053U CN204855053U CN201520512581.7U CN201520512581U CN204855053U CN 204855053 U CN204855053 U CN 204855053U CN 201520512581 U CN201520512581 U CN 201520512581U CN 204855053 U CN204855053 U CN 204855053U
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- pressure
- grating
- pressure test
- test device
- retainingf key
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Abstract
The utility model discloses a fiber grating pressure sensor of pipeline pressure monitoring, including pressure transducer spare, pressure test device, seal shell, fixed structure etc. Pressure transducer spare changes the compression that external pressure cycle is diaphragm center amount of deflection to the overall dimension of the change pressure transducer spare through the flexibility changes the test range, has guaranteed the commonality that the product used under each range environment. The pressure test device is exerted the change of amount of deflection on the dynamometry grating, results in the grating shrink, and the reflection wavelength reduces, reaches test purpose, and the temperature compensating grating is through adjusting length and material thermal expansion coefficient for reduce the temperature coefficient and the temperature compensating of dynamometry grating, reach optimum temperature compensating. The utility model is suitable for a long distance transmission, anti -electromagnetic interference, insulating this ann can replace general pressure transmitter and corrugated diaphragm manometer now completely.
Description
Technical field
The utility model belongs to technical field of optical fiber sensing, is specifically related to the fiber bragg grating pressure sensor of a kind of pipeline pressure monitoring.
Background technology
Pressure pipeline surface stress strain regime is the general performance of pressure pipeline at risk status lower stress, is related to the mechanics safety of pressure pipeline.Pressure pipeline surface strain detects the generation that effectively can prevent pressure pipeline pipe explosion accident, and method of testing the most frequently used at present has artificial milscale detection method, pressure unit method, resistance-strain chip detection method and convoluted diaphragm pressure measurement force method etc.The shortcoming of artificial milscale detection method is that cannot realize real-time online detects, and complex procedures, measurement efficiency is low, measuring error is large, have a strong impact on measuring accuracy, and pressure unit method, resistance strain gage detection method measuring accuracy are not high, and be subject to electromagnetic interference (EMI), be not suitable for inflammable and explosive occasion and detect.Although convoluted diaphragm tensimeter has certain corrosion resistance, if project installation is improper or observation process pressurized is too high, the serviceable life of convoluted diaphragm greatly can be reduced.The strain of fiber-optic grating sensor detected pressures pipe surface is the technological means that a kind of full light sensing, high precision, electromagnetism interference, essential safety and efficiency are higher, is convenient to realize online multiple spot Distributed Detection simultaneously.
Utility model content
Technical problem to be solved in the utility model overcomes the problems such as existing pipeline pressure fiber-optic grating sensor range ability bad adaptability, long term monitoring drift, provides the fiber bragg grating pressure sensor that a kind of range ability can adjust flexibly, the pipeline pressure of ' zero shift ' is monitored.
For solving the problems of the technologies described above, the utility model adopts following technical scheme to realize:
A kind of fiber bragg grating pressure sensor of pipeline pressure monitoring, comprise pressure conduction device, be positioned at the sensed pressure mouth of pressure conduction device rear end, pressure test device, seal casinghousing, fixed sturcture and an optical fiber (16), optical fiber (16) is carved with from left to right successively a pressure test grating (11) and a temperature compensation grating (12), it is characterized in that, a pressure test grating is welded between the first grating retainingf key and the second grating retainingf key by glass solder, a temperature compensation grating is welded between the second grating retainingf key and the 3rd grating retainingf key by glass solder, one end of first grating retainingf key is fixed on pressure conduction device by screw knob, the other end of the first grating retainingf key is fixed on pressure test device by No. 1 screw jackscrew, pressure test device and the second grating retainingf key are fixed by No. 2 screw jackscrews, pressure test device and the 3rd grating retainingf key are fixed by No. 3 screw jackscrews, there is the T-shaped diaphragm of the metal material integrally shaped with pressure conduction device pressure conduction device front end, the T-shaped diaphragm of pressure conduction device front end contacts with the pressure test grating be fixed on pressure test device through the cavity of pressure test device rear end, the front end of pressure conduction device and the rear end of pressure test device are fixed together by gluing, the internal thread of seal casinghousing rear end docks with the external thread in pressure conduction device stage casing thus is sealed in seal casinghousing by pressure test device, the external thread of seal casinghousing front end docks with the internal thread of stationary installation rear end, the fiber place of stationary installation front end fixes plug by M3 and closes and seal with marine glue.
Compared with prior art the beneficial effects of the utility model are:
1. fiber grating makes pipe pressure sensor, although overcome conventional pressure sensor cannot on-line monitoring, precision low, be subject to electromagnetic interference (EMI), the shortcoming such as perishable.But general fiber bragg grating pressure sensor complicated structure, improper for the application of different pipeline pressure range, often to change large quantities of sensor according to pipeline pressure scope, add cost of manufacture, extend the construction period.The utility model, under the prerequisite ensureing measuring accuracy, just can realize the pressure survey of pipeline under all pressure ranges only by the diaphragm thickness changing pressure conduction device 1.Pressure conduction device 1 front end is M20 × 1.5 external thread, be of a size of the standard thread size under most of pressure measurement environment, be convenient to install, by screw thread docking, pressure is passed on the pressure-sensitive diaphragm of diameter 12mm, the center amount of deflection change transitions of pressure-sensitive diaphragm is compression fiber grating the most at last, reaches test effect.Utilize pressure Yue great He center amount of deflection change relation greatly, ensure pressure and center amount of deflection fixed relationship only by the thickness changing pressure-sensitive diaphragm, thus ensure the consistance of Compressed grating, thus ensure the versatility of product under each pressure range.
2. pipeline pressure test, often sensor is imbedded underground, parameter drift is the key factor affecting pipeline pressure long term monitoring.Because aerobic rubber seal dress commonly used by ordinary optic fibre grating sensor, this fixing method is due to the reason of colloid creep, keep the impact of stability very large on this stretching stress, the method elimination that can only adopt calibration and compensate, but the difference due to environment for use causes the speed of creep not identical, so the difficulty of calibration and compensation is large, precision is low.The utility model adopts the mode fixed fiber grating of anaerobic glue welding, increases substantially the long-time stability of product.In order to ensure stable wavelength reflection coefficient, need in manufacturing process first to pressure test grating 11 (namely ' 0 ' state is the state that pressure test grating 11 stretches), grating is in the stressed state that stretches all the time.The mode (glass solder welding) of being welded by anaerobic glue replaces the mode of aerobic rubber seal dress, proves there is larger improvement to creep by long-term experiment.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the utility model is further described:
Fig. 1 is the structural representation of the fiber bragg grating pressure sensor of a kind of pipeline pressure monitoring described in the utility model.
Fig. 2 is the annexation schematic diagram of the fiber bragg grating pressure sensor of a kind of pipeline pressure monitoring described in the utility model.
Fig. 3 is that the fiber bragg grating pressure sensor of a kind of pipeline pressure monitoring described in the utility model adopts the sensor creep test curve comparison diagram of a year adopting aerobic glue packaged type in the mode creep test curve of a year of anaerobic glue welding and prior art.
In figure: 1, pressure conduction device, 2, pressure test device, 3, No. 2 screw jackscrews, 4, seal casinghousing, 5, fixed sturcture, 6, No. 1 screw jackscrews, 7, the first grating retainingf key, the 8, second grating retainingf key, the 9, the 3rd grating retainingf key, 10, sensed pressure mouth, 11, pressure test grating, 12, temperature compensation grating, 13, No. 3 screw jackscrews, 14, M3 fixes plug, and 15, T-shaped diaphragm, 16, optical fiber.
Embodiment
Below in conjunction with accompanying drawing, the utility model is explained in detail:
Consult Fig. 1 and Fig. 2, a kind of fiber bragg grating pressure sensor of pipeline pressure monitoring, comprise pressure conduction device 1, be positioned at the sensed pressure mouth 10 of pressure conduction device 1 rear end, pressure test device 2, seal casinghousing 4, fixed sturcture 5 and an optical fiber (16), optical fiber (16) is carved with from left to right successively a pressure test grating (11) and a temperature compensation grating (12), it is characterized in that, a pressure test grating 11 is welded between the first grating retainingf key 7 and the second grating retainingf key 8 by glass solder, a temperature compensation grating 12 is welded between the second grating retainingf key 8 and the 3rd grating retainingf key 9 by glass solder, one end of first grating retainingf key 7 is fixed on pressure conduction device 1 by screw knob, the other end of the first grating retainingf key 7 is fixed on pressure test device 2 by No. 1 screw jackscrew 6, pressure test device 2 and the second grating retainingf key 8 are fixed by No. 2 screw jackscrews 3, pressure test device 2 and the 3rd grating retainingf key 9 are fixed by No. 3 screw jackscrews 13, there is the T-shaped diaphragm 15 of the metal material integrally shaped with pressure conduction device 1 pressure conduction device 1 front end, the cavity that the T-shaped diaphragm 15 of pressure conduction device 1 front end passes pressure test device 2 rear end contacts with the pressure test grating 11 be fixed on pressure test device 2.The front end of pressure conduction device 1 and the rear end of pressure test device 2 are fixed together by gluing, the internal thread of seal casinghousing 4 rear end docks with the external thread in pressure conduction device 1 stage casing thus is sealed in seal casinghousing 4 by pressure test device 2, the external thread of seal casinghousing 4 front end docks with the internal thread of stationary installation 5 rear end, and the fiber place of stationary installation 5 front end fixes plug 14 by M3 and closes and seal with marine glue.
In pressure sensor 1, T-shaped diaphragm 15 is integrated processing with pressure conduction device 1, the thickness of T-shaped diaphragm 15 is processed by lathe with high precision, different according to measurement range, can arbitrarily change different pressures conductive features 1, fundamental purpose changes the thickness of T-shaped diaphragm 15 in pressure conduction device 1, and the adaptability of sensor is improved.
The fiber bragg grating pressure sensor of a kind of pipeline pressure monitoring described in the utility model, comprise pressure conduction device 1, pressure test grating 11, temperature compensation grating 12, the wherein effect of pressure conduction device 1: the compression variation being used for ambient pressure to be converted to T-shaped diaphragm 15 center amount of deflection, and change testing range by the physical dimension (diameter and thickness) changing pressure conduction device 1 flexibly, ensure that the versatility that product uses under each range environment.The effect of pressure test device 2: be used for the change of amount of deflection to be applied on pressure test grating 11, cause pressure test grating 11 to shrink, reflection wavelength reduces, and reaches test purpose.The effect of temperature compensation grating 12 is, by regulating length and the material thermal expansion coefficient of temperature compensation grating 12, making the temperature coefficient and the temperature compensation that reduce pressure test grating 11, reaching Optimal Temperature and compensating.The technical scheme provided as can be seen from above the utility model, what the utility model provided is applicable to the monitoring of various pipeline pressure, the versatility that whole range reaches product can be changed only by this part of change pressure conduction device 1, and principle adopts fiber grating test philosophy to be applicable to long-distance transmissions, electromagnetism interference, the characteristics such as insulation intrinsic safety.And being adhesively fixed of inner employing special mechanism makes Long-Time Service basic ' zero shift ', reaches the stability of product.
Table 1
| Pressure | Diaphragm thickness | Center amount of deflection change |
| 0.5Mpa | 0.33mm | 0.02mm |
| 2Mpa | 0.53mm | 0.02mm |
| 20Mpa | 1.08mm | 0.02mm |
| 30Mpa | 1.22mm | 0.02mm |
| 70Mpa | 1.6mm | 0.02mm |
The guarantee of stability: the fiber bragg grating pressure sensor of this product design, when pressure increase time, center amount of deflection change, what show is the compression of pressure test grating 11, in order to ensure stable wavelength reflection coefficient, need in manufacturing process first to stretch (namely ' 0 ' state is the state that pressure test grating 11 stretches) to pressure test grating 11.So pressure test grating 11 is in the stressed state that stretches all the time, what now most of similar-type products adopted on the market is ultraviolet glue and epoxide-resin glue, the creep of glue is very large on the impact of stability, the method elimination that can only adopt calibration and compensate, but the difference due to environment for use causes the speed of creep not identical, so the difficulty of calibration and compensation is large, precision is low, the mode that this product replaces aerobic rubber seal to fill by the mode that anaerobic glue welds, proves there is larger improvement to creep by long-term experiment.
Claims (1)
1. the fiber bragg grating pressure sensor of a pipeline pressure monitoring, comprise pressure conduction device (1), be positioned at the sensed pressure mouth (10) of pressure conduction device (1) rear end, pressure test device (2), seal casinghousing (4), fixed sturcture (5) and an optical fiber (16), optical fiber (16) is carved with from left to right successively a pressure test grating (11) and a temperature compensation grating (12), it is characterized in that, pressure test grating (11) is welded between the first grating retainingf key (7) and the second grating retainingf key (8) by glass solder, temperature compensation grating (12) is welded between the second grating retainingf key (8) and the 3rd grating retainingf key (9) by glass solder, one end of first grating retainingf key (7) is fixed on pressure conduction device (1) by screw knob, the other end of the first grating retainingf key (7) is fixed on pressure test device (2) by No. 1 screw jackscrew (6), pressure test device (2) is fixed by No. 2 screw jackscrews (3) with the second grating retainingf key (8), pressure test device (2) is fixed by No. 3 screw jackscrews (13) with the 3rd grating retainingf key (9), there is the T-shaped diaphragm (15) of the metal material integrally shaped with pressure conduction device (1) pressure conduction device (1) front end, the T-shaped diaphragm (15) of pressure conduction device (1) front end contacts with the pressure test grating (11) be fixed on pressure test device (2) through the cavity of pressure test device (2) rear end, the front end of pressure conduction device (1) and the rear end of pressure test device (2) are fixed together by gluing, the internal thread of seal casinghousing (4) rear end docks with the external thread in pressure conduction device (1) stage casing thus is sealed in seal casinghousing (4) by pressure test device (2), the external thread of seal casinghousing (4) front end docks with the internal thread of stationary installation (5) rear end, the fiber place of stationary installation (5) front end fixes plug (14) by M3 and closes and seal with marine glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512581.7U CN204855053U (en) | 2015-07-16 | 2015-07-16 | Fiber grating pressure sensor of pipeline pressure monitoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520512581.7U CN204855053U (en) | 2015-07-16 | 2015-07-16 | Fiber grating pressure sensor of pipeline pressure monitoring |
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| Publication Number | Publication Date |
|---|---|
| CN204855053U true CN204855053U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520512581.7U Expired - Fee Related CN204855053U (en) | 2015-07-16 | 2015-07-16 | Fiber grating pressure sensor of pipeline pressure monitoring |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949780A (en) * | 2015-07-16 | 2015-09-30 | 吉林大学 | Fiber bragg grating pressure sensor for pipeline pressure monitoring |
| CN108020259A (en) * | 2016-11-02 | 2018-05-11 | 北京暖流科技有限公司 | A kind of device of while measurement temperature and pressure |
| CN108398203A (en) * | 2018-05-14 | 2018-08-14 | 苏州名列膜材料有限公司 | A kind of blocking solution test device and blocking solution test system |
-
2015
- 2015-07-16 CN CN201520512581.7U patent/CN204855053U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949780A (en) * | 2015-07-16 | 2015-09-30 | 吉林大学 | Fiber bragg grating pressure sensor for pipeline pressure monitoring |
| CN108020259A (en) * | 2016-11-02 | 2018-05-11 | 北京暖流科技有限公司 | A kind of device of while measurement temperature and pressure |
| CN108398203A (en) * | 2018-05-14 | 2018-08-14 | 苏州名列膜材料有限公司 | A kind of blocking solution test device and blocking solution test system |
| CN108398203B (en) * | 2018-05-14 | 2024-06-04 | 苏州名列膜材料有限公司 | Liquid resistance testing device and liquid resistance testing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20180716 |