CN201444094U - Pull-rod type fiber grating osmometer - Google Patents
Pull-rod type fiber grating osmometer Download PDFInfo
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- CN201444094U CN201444094U CN2009200295178U CN200920029517U CN201444094U CN 201444094 U CN201444094 U CN 201444094U CN 2009200295178 U CN2009200295178 U CN 2009200295178U CN 200920029517 U CN200920029517 U CN 200920029517U CN 201444094 U CN201444094 U CN 201444094U
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Abstract
The utility model relates to a pull-rod type fiber grating osmometer, which comprises a casing, and is characterized in that end covers with holes are respectively arranged at two ends of the casing, pressure diaphragms are arranged among one end inside the casing and the end covers; a grating supporting frame is disposed on the inner wall of the casing, pressure guide rods are disposed inside the casing, one ends of the pressure guide rods are bonded with the pressure diaphragms, the other ends of the pressure guide rods are fixedly connected with one ends of pressure measuring gratings, the other ends of the pressure measuring gratings are fixed onto the grating supporting frame; a temperature compensation grating is arranged on the grating supporting frame, the other end of the temperature compensation grating is in a free state; and the pressure measuring gratings and the temperature compensation grating are all led out of holes of one end cover at one end of the casing through optical fibers. The osmometer is on the basis of overall optical signal design without electronic components, thereby having excellent waterproof performance, no hidden danger of electric sparks and anti-electromagnetic interference property. The osmometer adopts the corrugation diaphragms and the two pressure measuring gratings, improves accuracy and reliability of measurement, is convenient for networking, and can realize accurately distributive real-time monitoring.
Description
Technical field
The utility model relates to the intelligence sensor of a kind of osmotic pressure and temperature simultaneously measuring.A kind of specifically pull-rod fiber bragg grating osmometer with temperature compensation function.
Background technology
At present in the tunnel, engineering fields such as dykes and dams, subway, colliery and oil field, adopt electric class osmometer to measure interstitial hydraulic pressure mostly.Traditional electric class osmometer measuring accuracy is low, and volume is big, and water resistance is poor, and the life-span is short, discharge easily, and be subject to electromagnetic interference (EMI), seriously limited its widespread use.
Fiber grating is a kind of temperature and stress sensing device of function admirable, and since people are used for sensing to fiber grating, fiber-optic grating sensor has proposed brand-new challenge with its special advantages to traditional electric transducer etc.It compares especially unique advantage with traditional electric transducer etc.: 1. sensing head is simple in structure, volume is little, in light weight, be fit to also can imbed in the large scale structure attached to tested body structure surface, the stress of measurement structure inside, strain and structural damage etc., stability is high, good reproducibility; 2. and have natural compatibility between the optical fiber, easily be connected with optical fiber, low-loss, spectral characteristic is good, reliability is high; 3. have non-conducting, little to measured medium influence, have characteristics anticorrosive, anti-electromagnetic interference (EMI) again, be adapted near the coal gas, work in abominable under the power station, nuclear facilities, mine, around oil field and the oil tank etc., the high-risk environment; 4. optical fiber is lightly soft, can write a plurality of gratings in an optical fiber, constitutes sensor array, combines with multiplex techniques such as wavelength-division multiplex and time division multiplexes, realizes multiple spot, distributed sensing; 5. metrical information is a Wavelength-encoding, so fiber-optic grating sensor is not subjected to the influence of factors such as the light-intensity variation, fibre loss of light source, stronger antijamming capability is arranged; 6. high sensitivity, high degree of resolution.
In actual engineering field, require to detect exactly for a long time pore water pressure, at present about seldom, and do not see relevant patent based on the report of the high-sensitivity optical fiber grating osmotic pressure sensor of convoluted diaphragm.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, a kind of measuring accuracy height is provided, and volume is little, has favorable waterproof property, anti-electromagnetic interference (EMI), and pull-rod fiber bragg grating osmometer that can long term monitoring.
For achieving the above object, the utility model adopts following technical proposals:
A kind of pull-rod fiber bragg grating osmometer comprises housing, and the housing two ends are respectively equipped with end cap with holes, is provided with pressure-sensitive diaphragm between an end and the end cap in the housing, and inner walls is provided with the grating bracing frame, is provided with a pressure guide rod in the housing; Pressure guide rod one end and pressure-sensitive diaphragm bonding, the other end is fixedlyed connected with pressure measuring gratings one end; The pressure measuring gratings other end is fixed on the grating bracing frame; The grating bracing frame is provided with the temperature compensation grating, and the other end of temperature compensation grating is in free state; Pressure measuring gratings and temperature compensation grating are all drawn in the hole of housing one end end cap by optical fiber.
Described one of them end cap is provided with an optical fiber fairlead, and another end cap is provided with some entrance pressures hole, and entrance pressure has screen pack on the hole; Be equipped with the O RunddichtringO between two end cap and the housing.
Described two end caps all are connected with the housing two ends by screw thread.
Described pressure-sensitive diaphragm is a convoluted diaphragm.
An elasticity O type circle is arranged between described pressure-sensitive diaphragm and the housing.
Described pressure guide rod one end is bonded in the middle part of pressure-sensitive diaphragm.
Described pressure measuring gratings is vertical with pressure-sensitive diaphragm.
Described pressure guide rod is T-shaped symmetrical structure.
Pore water enters osmometer by the entrance pressure mouth, act on the convoluted diaphragm, make convoluted diaphragm generation deflection deformation, change into concentrated force simultaneously and act on the pressure guide rod, pressure guide rod pulling grating changes pressure measuring gratings centre wavelength under the pulling force effect.Use the centre wavelength of wavelength demodulation device detected temperatures null grating and pressure measuring gratings this moment, and by software collection storage data.Can realize the detection of osmotic pressure according to the temperature response curve of temperature compensation grating and pressure measuring gratings.
As can be seen from the above technical solutions, the utility model does not have electron device based on full optical signal design, therefore has favorable waterproof property, does not have electric spark hidden danger, and anti-electromagnetic interference (EMI).The utility model has adopted convoluted diaphragm, and has adopted two pressure measuring gratings, has improved measuring accuracy and measuring reliability.Simultaneously, the utility model is convenient to networking, and can realize quasi-distributed real-time monitoring.
Description of drawings
Fig. 1 is the elevation cross-sectional view of fiber bragg grating osmometer of the present invention;
Fig. 2 is the top plan view of fiber bragg grating osmometer of the present invention;
Fig. 3 a, Fig. 3 b are pressure and the pressure measuring gratings centre wavelength graph of relation that the present invention surveyed;
Fig. 4 a, Fig. 4 b are temperature and the pressure measuring gratings centre wavelength graph of relation that the present invention surveyed;
Fig. 5 is temperature and the temperature compensation grating centre wavelength graph of relation that the present invention surveyed.
1. housings wherein, 2. end cap, 3. optical fiber fairlead, 4. pressure-sensitive diaphragm, 5. grating bracing frame, 6. pressure guide rod, 7. pressure measuring gratings, 8. temperature compensation grating, 9. optical fiber, 10. entrance pressure hole,
Embodiment
Below in conjunction with drawings and Examples the utility model is further specified.
Among Fig. 1, Fig. 2, housing 1 two ends are respectively equipped with end cap with holes 2, are provided with pressure-sensitive diaphragm 4 between an end and the end cap 2 in the housing 1, can directly experience the pressure at 10 places, entrance pressure hole.Housing 1 inwall is provided with grating bracing frame 4, be provided with a pressure guide rod 6 in the housing 1, pressure guide rod 6 one ends and pressure-sensitive diaphragm 4 bondings, fixedly connected with pressure measuring gratings 7 one ends on pressure guide rod 6 other ends, pressure measuring gratings 7 other ends are fixed on the grating bracing frame 5, grating bracing frame 5 is provided with temperature compensation grating 8, the other end of temperature compensation grating 8 is in free state, and pressure measuring gratings 7 and temperature compensation grating 8 are all drawn through the optical fiber fairlead 3 of housing 1 one end end caps 2 by optical fiber 9.
Described one of them end cap is provided with an optical fiber fairlead 3, and another end cap 2 is provided with some entrance pressures hole 10, on the entrance pressure hole 10 screen pack is arranged, and can effectively stop silt to enter in the housing 1; Be equipped with the O RunddichtringO between two end cap 2 and the housing 1.
Described two end caps 2 all are connected with housing 1 two ends by screw thread.
Described pressure-sensitive diaphragm 4 is a convoluted diaphragm.
An elasticity O type circle is arranged between described pressure-sensitive diaphragm 4 and the housing 1.
Described pressure guide rod 6 one ends are bonded in the middle part of pressure-sensitive diaphragm 4.
Described pressure measuring gratings 7 and pressure-sensitive diaphragm 4 vertical settings.Pressure measuring gratings 7 symmetric arrangement to guarantee that pressure guide rod 6 is vertical with convoluted diaphragm 4 in the course of work, improve measuring accuracy.
Described pressure guide rod 6 is T-shaped symmetrical structure.
When pore water pressure acts on osmometer entrance pressure hole 10, act on the convoluted diaphragm, make convoluted diaphragm generation deflection deformation, its center produces the displacement of vertical diaphragm direction, pressure guide rod 6 also produces identical displacement simultaneously, therefore pressure guide rod 6 pulling gratings change pressure measuring gratings 7 centre wavelength under the pulling force effect.
Concrete manufacturing process of the present invention is: at first, two pressure measuring gratings 7 and a temperature compensation grating 8 that selected center's wavelength is different, and grating bracing frame 5 symmetries are bonded on housing 1 inwall, pressure guide rod 6 is bonded on the convoluted diaphragm, make the two vertical mutually.Then, pressure measuring gratings 7 and temperature compensation grating 8 one ends are separately fixed on the grating bracing frame 5, by bringing the end cap 2 of pressing hole 10 and housing 1 into the convoluted diaphragm jam-packed, the other end with pressure measuring gratings 7 is fixed on the pressure guide rod 6 simultaneously.At last, optical fiber 9 is drawn from the optical fiber fairlead 3 on another end cap 2, and will tighten sealing with the end cap 2 and the housing 1 of optical fiber fairlead 3.
In order to realize purpose of the present invention, at first nominal pressure is measured the variation relation of the centre wavelength of grating 7 with pressure under constant temperature, shown in Fig. 3 a, Fig. 3 b, the linear relationship of centre wavelength (nm) and pressure (KPa) is respectively y=0.0185x+1543.1 and y=0.0188x+1553, linearity R
2Be respectively 0.9927 and 0.9983.This explanation the present invention is an extraordinary empirical model of the linearity, and has generality.
For pressure parameter being carried out the efficient temperature compensation, the centre wavelength of having demarcated pressure measuring gratings 7 and temperature compensation grating 8 respectively concerns with variation of temperature, as Fig. 4 a, Fig. 4 b and shown in Figure 5, centre wavelength (nm) and temperature (℃) linear relationship be respectively y=0.0159x+1543.2, y=0.0154x+1552.8 and y=0.016x+1548.2, linearity R
2Be respectively 0.9973,0.9973 and 0.9955.
In detecting at the scene, at first according to the center wavelength variation situation of temperature compensation grating 8, measure tested point variation of temperature situation, eliminate Temperature Influence according to the centre wavelength of pressure measuring gratings 7 with the variation of temperature relation again, can record the pressure changing of tested point at last with the variation relation of pressure according to the centre wavelength of pressure measuring gratings 7.In order to improve measuring accuracy, get the pressure mean values of pressure measuring gratings 7.
By above measuring method, can make the accuracy of detection of fiber bragg grating osmometer reach 0.1%F.S, effectively improved the quality and the efficient that detect.
Claims (8)
1. pull-rod fiber bragg grating osmometer, it is characterized in that: comprise housing, the housing two ends are respectively equipped with end cap with holes, be provided with pressure-sensitive diaphragm between an end and the end cap in the housing, inner walls is provided with the grating bracing frame, be provided with a pressure guide rod in the housing, pressure guide rod one end and pressure-sensitive diaphragm bonding, the other end is fixedlyed connected with pressure measuring gratings one end; The pressure measuring gratings other end is fixed on the grating bracing frame; The grating bracing frame is provided with the temperature compensation grating, and the other end of temperature compensation grating is in free state; Pressure measuring gratings and temperature compensation grating are all drawn in the hole of housing one end end cap by optical fiber.
2. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described one of them end cap is provided with an optical fiber fairlead, and another end cap is provided with some entrance pressures hole, and entrance pressure has screen pack on the hole; Be equipped with the O RunddichtringO between two end cap and the housing.
3. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described two end caps all are connected with the housing two ends by screw thread.
4. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described pressure-sensitive diaphragm is a convoluted diaphragm.
5. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: an elasticity O type circle is arranged between described pressure-sensitive diaphragm and the housing.
6. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described pressure guide rod one end is bonded in the middle part of pressure-sensitive diaphragm.
7. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described pressure measuring gratings is vertical with pressure-sensitive diaphragm.
8. pull-rod fiber bragg grating osmometer according to claim 1 is characterized in that: described pressure guide rod is T-shaped symmetrical structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200295178U CN201444094U (en) | 2009-07-14 | 2009-07-14 | Pull-rod type fiber grating osmometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200295178U CN201444094U (en) | 2009-07-14 | 2009-07-14 | Pull-rod type fiber grating osmometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201444094U true CN201444094U (en) | 2010-04-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200295178U Expired - Fee Related CN201444094U (en) | 2009-07-14 | 2009-07-14 | Pull-rod type fiber grating osmometer |
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| CN (1) | CN201444094U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509957A (en) * | 2016-01-06 | 2016-04-20 | 中国石油天然气股份有限公司 | Fiber grating pressure transducer |
| CN114112233A (en) * | 2021-11-26 | 2022-03-01 | 国家能源投资集团有限责任公司 | Seepage monitor, seepage monitoring system and seepage monitoring method for underground reservoir |
-
2009
- 2009-07-14 CN CN2009200295178U patent/CN201444094U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105509957A (en) * | 2016-01-06 | 2016-04-20 | 中国石油天然气股份有限公司 | Fiber grating pressure transducer |
| CN105509957B (en) * | 2016-01-06 | 2019-03-12 | 中国石油天然气股份有限公司 | A kind of fiber bragg grating pressure sensor |
| CN114112233A (en) * | 2021-11-26 | 2022-03-01 | 国家能源投资集团有限责任公司 | Seepage monitor, seepage monitoring system and seepage monitoring method for underground reservoir |
| CN114112233B (en) * | 2021-11-26 | 2023-11-14 | 国家能源投资集团有限责任公司 | Seepage monitor, seepage monitoring system and underground reservoir seepage monitoring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100428 Termination date: 20110714 |