CN103466234B - Sensor device for utilizing fiber bragg grating (FBG) to measure oil weight of oil tank - Google Patents
Sensor device for utilizing fiber bragg grating (FBG) to measure oil weight of oil tank Download PDFInfo
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- CN103466234B CN103466234B CN201310404186.2A CN201310404186A CN103466234B CN 103466234 B CN103466234 B CN 103466234B CN 201310404186 A CN201310404186 A CN 201310404186A CN 103466234 B CN103466234 B CN 103466234B
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Abstract
The invention discloses a sensor device for utilizing fiber bragg grating (FBG) to measure oil weight of an oil tank. The sensor device comprises a liquid level sensor for adopting an FBG optical fiber to detect the liquid level and two density sensors for adopting FBG optical fibers to detect density, wherein the top end of the liquid level sensor is fixed at the top of the oil tank, an elongated liquid level weight regular in shape is vertically lifted at the bottom end of the liquid level sensor, and the bottom end of the liquid level weight is close to the bottom surface of the oil tank. The top ends of the two density sensors are fixed at the top of the oil tank, and an oil level weight soaked on the rated oil quantity top surface of the oil tank and an oil bottom weight soaked at the bottom of the oil tank are respectively lifted at the bottom ends of the density sensors. By density detection of a top layer and a bottom layer of oil and real-time liquid level measurement through the FBG optical fibers, the real-time weight of oil in the oil tank can be obtained finally, the FBG optical fibers are good in strain transmitting effect and suitable for the environments of oil depots and oil wells and the like where electronic sensors are not applicable, the measuring range of the FBG optical fiber can be 20m, measurement accuracy of 0.25%. is achieved, sensor main bodies are not contacted with the oil, good performance can be maintained for a long term, and the sensor device is convenient to install, use, overhaul and replace.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to one and utilize FBG(Fiber Bragg Grating FBG) measure the heavy sensor device of oil tank oil.
Background technology
Current LOAD CELLS is based on electrical type, although electrical type LOAD CELLS comparative maturity, but because electrical type sensor is except needs power supply, especially can not use under rugged environment is as conditions such as high temperature, deep-etching, high humility, so at some special dimension as large-scale oil tank, oil well etc. are difficult to the measurement realizing some parameters.
The people such as the K.O.Hill of Canadian CRC Communications Research Center in 1978 have found the light sensitive characteristic of germnium doped fiber and have produced first fiber grating in the world, along with the progress of grating writing technology afterwards and cryogenic high pressure carry the discovery of hydrogen-sensitized processing technology, the batch production of fiber grating is made to become possibility, fiber grating starts to move towards practical, is widely used in optical fiber communication and sensory field of optic fibre.Current fiber grating has been widely used in static state and the kinetic measurement of numerous physical parameters such as strain, temperature, pressure, has played important effect at sensory field.These sensors mainly comprise FBG strain transducer, temperature sensor, acceleration transducer, displacement transducer etc.
Large-scale oil storage tank in current oil field is very big to the demand of oily remeasurement FBG sensor, and because its bulky degree of depth is high, environment for use is severe, and never sensor solves the heavy measurement problem of oil.
Summary of the invention
The object of the invention is for above-mentioned large-scale oil storage tank oil resurvey quantifier elimination difficulty present situation, provide the sensor device utilizing FBG measurement oil tank oil to weigh that a kind of high precision and large measuring range is measured, precision can reach 0.25 ‰, and the dark range of oil reaches 20 meters, technique is simple, and reliability is high.
The present invention adopts following technical scheme to realize: a kind of FBG measures the heavy sensor device of oil tank oil, comprise the liquid level sensor 5 that adopts FBG fiber laser arrays liquid level, its top is fixed on oil tank 3 top, bottom is vertically lifted with the strip liquid level weight 6 of regular shape, and the bottom of described liquid level weight 6 is close to oil tank bottom surface; The density sensor 1 of two employing FBG fiber laser arrays density, its top is all fixed on oil tank 3 top, and bottom is lifted with the weight of the oily end 4 of pasta the weight 2 and tank bottom being immersed in oil tank nominal oil level end face respectively.
Described density sensor 1 and liquid level sensor 5 include sensor main body 12 and main FBG detection fiber 15, the top of described sensor main body 12 is provided with fixed orifice 13 and is fixed by sensor main body 12, and its bottom is provided with weight connecting hole 16 and lifts the weight be immersed in fluid; Sensor main body 12 is provided with a vertical straight line groove and is connected and fixed hole 13 and weight connecting hole 16, described main FBG detection fiber 15 is fixedly encapsulated in described groove.
Described density sensor 1 and liquid level sensor 5 all also comprise sensor housing, described sensor main body 12 is fixedly installed in sensor housing, described sensor housing inside is provided with the screw thread fixed leg 11 mated with fixed orifice 13, by nut fixation of sensor main body 12, the top of described sensor housing is provided with shell fixing structure 9 and density sensor 1 and liquid level sensor 5 is connected with roof, and bottom is provided with weight suspension mouth 8 and lifts for weight and sensor main body.
The sensor main body 12 at described main FBG detection fiber about 15 two ends is provided with strain structure for amplifying 14.
Described strain structure for amplifying 14 is shaped as frame strain structure for amplifying.
The sensor main body 12 of described main FBG detection fiber 15 both sides is provided with the vertical groove that encapsulation fixed temperature compensates FBG optical fiber 17, and described temperature compensation FBG optical fiber 17 be arranged in parallel with main FBG detection fiber 15.
The bottom of described sensor housing is provided with optical fiber and lays mouth 7.
The sensor main body of two density sensors 1 is all fixedly installed in a density sensor housing 18, and two main FBG detection fiber are all vertically arranged.
Described liquid level weight 6 is the right cylinder of even material.
The inner fixation of sensor body of sensor housing, FBG optical fiber is installed in sensor body and connects weight, the buoyancy change of weight to be passed on FBG optical fiber by strain structure for amplifying thus to make the centre wavelength of FBG produce drift change, realize the detection of buoyancy, more corresponding data can be obtained by buoyancy formula F=ρ gV.
After the fluid in oil tank is filled, after fluid molecular motion reaches stable state, the liquid that density is large will sink, density in oil tank evenly diminishes from top to bottom, canful fluid is divided into n layer, k is the number of plies of real-time level in process of draining the oil, liquid level sensor connects the rectangular liquid level weight of a homogeneous, the change of power is delivered to oily remeasurement FBG sensor core in the heart by the change experiencing buoyancy by immersion by this weight in a liquid, to be passed to FBG on by strain structure for amplifying again thus to make the centre wavelength of FBG produce drift and change data k layer fluid buoyancy being detected, according to buoyancy formula F=ρ
kthe cubature formula of gV and liquid level weight can draw oil tank real-time level information, simultaneously because fluid density is change, also need the fluid density detecting liquid level layer, according to buoyancy formula F=ρ gV, two density sensors hang the buoyancy that regular density weight that two volumes fix is subject to tank bottom and top oil reservoir respectively, record two limiting density ρ of oil tank inner fluid
1and ρ
n, because fluid is from top to bottom even variation, by ρ
kwith ρ
1, ρ
nrelation bring F=ρ into
kgV, can draw k, transfers the oil tank volume (being specially adapted to oil tank in irregular shape) under the known now liquid level of oil tank database, fluid weight when can obtain k layer fluid according to m=ρ V, realizes detecting the object that in oil tank, oil is heavy in real time.
The present invention has following beneficial effect.
The direct rubber seal of 1.FBG optical fiber is in sensor body, and strain transfer is respond well, and can the sensitivity of regulator solution level sensor under structure for amplifying,
2. range can accomplish 20 meters, reaches the measuring accuracy of 0.25 ‰,
3. sensor main body does not contact with liquid, can keep good performance for a long time, installs and uses maintenance and changes conveniently,
4. structure is simple, and the packaging technology of FBG optical fiber is succinct, is applicable to volume production.
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Accompanying drawing explanation
Fig. 1 is the transducer arrangement configuration schematic diagram that the present invention relates to.
Fig. 2 is liquid level sensor structural representation.
Fig. 3 is liquid level sensor shell structure schematic diagram.
Fig. 4 is sensor body structure schematic diagram.
Fig. 5 is density sensor shell structure schematic diagram.
Number in the figure: 1-density sensor, 2-pasta weight, 3-oil tank, 4-oil end weight, 5-liquid level sensor, 6-liquid level weight, mouth laid by 7-optical fiber, and 8-weight hangs mouth, 9-shell fixing structure, 10-liquid level sensor housing, 11-fixed leg, 12-sensor main body, 13-fixed orifice, 14-strains structure for amplifying, the main FBG detection fiber of 15-, 16-weight connecting hole, 17-temperature compensation FBG optical fiber, 18-density sensor housing.
Embodiment
Embodiment
See Fig. 1 to Fig. 5, sensor device comprises the liquid level sensor 5 that adopts FBG fiber laser arrays liquid level, and its top is fixed on oil tank 3 top, and bottom is vertically lifted with the strip liquid level weight 6 of regular shape, and the bottom of liquid level weight 6 is close to oil tank bottom surface; The density sensor 1 of two employing FBG fiber laser arrays density, its top is all fixed on oil tank 3 top, bottom is lifted with the weight of the oily end 4 of pasta the weight 2 and tank bottom being immersed in oil tank nominal oil level end face respectively, and wherein the pasta weight of top is immersed in the 5mm fluid of oil tank nominal oil level top.
Specifically see Fig. 1, Fig. 2 and Fig. 4, density sensor 1 and liquid level sensor 5 include sensor main body 12 and main FBG detection fiber 15, the top of sensor main body 12 is provided with fixed orifice 13 and is fixed by sensor main body 12, and its bottom is provided with weight connecting hole 16 and connects the weight be lifted in fluid; Sensor main body 12 is provided with a vertical straight line groove and is connected and fixed hole 13 and weight connecting hole 16, main FBG detection fiber 15 is fixedly encapsulated in groove.The sensor main body 12 at main FBG detection fiber about 15 two ends is provided with strain structure for amplifying 14, and strain structure for amplifying 14 is for being preferably shaped as frame strain structure for amplifying.The sensor main body 12 of main FBG detection fiber 15 both sides is provided with the vertical groove that encapsulation fixed temperature compensates FBG optical fiber 17, and temperature compensation FBG optical fiber 17 and main FBG detection fiber 15 be arranged in parallel.
Wherein, in conjunction with see Fig. 3 and Fig. 5, the sensor main body of two density sensors 1 is all fixedly installed in a density sensor housing 18, two main FBG detection fiber is all vertically arranged, the sensor main body 12 of liquid level sensor 5 is fixedly installed in liquid level sensor housing 10, density sensor housing 18 and liquid level sensor housing 10 inside are equipped with the screw thread fixed leg 11 mated with fixed orifice 13, the middle part of sensor main body 12 is provided with fixed orifice 13 equally, prevent sensor main body from swinging, fixed leg 11 by with nut screw connection fixation of sensor main body 12, the top of sensor housing is provided with shell fixing structure 9 and density sensor 1 and liquid level sensor 5 is connected with roof, bottom is provided with weight suspension mouth 8 and lifts for weight and sensor main body.The bottom of density sensor housing 18 and liquid level sensor housing 10 is provided with optical fiber and lays mouth 7.
In the present embodiment, liquid level weight 6 preferably adopts the right cylinder of homogeneous material, and the density of liquid level weight and density weight is all greater than the density of fluid, can be immersed in fluid.
Of the present inventionly specifically install and use employing following steps:
1. by being encapsulated on sensor main body without gel packaged type by main FBG detection fiber, make it in tension, other two temperature compensation FBG optical fiber are parallel is encapsulated into main FBG detection fiber both sides as temperature compensation grating, composition liquid level sensor core;
2. adopt the method in step 1 to form two density sensor cores;
3. be respectively fixed in density sensor housing and liquid level sensor housing by density sensor core and liquid level sensor core, optical fiber is laid mouth by optical fiber and is drawn and fix;
4. density weight and liquid level weight are hanging to density sensor and liquid level sensor bottom respectively, and weight placement is dipped in fluid.
Claims (9)
1. a FBG measures the heavy sensor device of oil tank oil, it is characterized in that: comprise the liquid level sensor (5) that adopts FBG fiber laser arrays liquid level, its top is fixed on oil tank (3) top, bottom is vertically lifted with the strip liquid level weight (6) of regular shape, and the bottom of described liquid level weight (6) is close to oil tank bottom surface;
The density sensor (1) of two employing FBG fiber laser arrays density, its top is all fixed on oil tank (3) top, and bottom is lifted with respectively and is immersed in the pasta weight (2) of oil tank nominal oil level end face and weight of the oily end (4) of tank bottom.
2. a kind of FBG according to claim 1 measures the heavy sensor device of oil tank oil, it is characterized in that: described density sensor (1) and liquid level sensor (5) include sensor main body (12) and main FBG detection fiber (15), the top of described sensor main body (12) is provided with fixed orifice (13) and is fixed by sensor main body (12), and its bottom is provided with weight connecting hole (16) and lifts the weight be immersed in fluid; Sensor main body (12) is provided with a vertical straight line groove and is connected and fixed hole (13) and weight connecting hole (16), described main FBG detection fiber (15) is fixedly encapsulated in described groove.
3. a kind of FBG according to claim 2 measures the heavy sensor device of oil tank oil, it is characterized in that: described density sensor (1) and liquid level sensor (5) all also comprise sensor housing, described sensor main body (12) is fixedly installed in sensor housing, described sensor housing inside is provided with the screw thread fixed leg (11) mated with fixed orifice (13), by nut fixation of sensor main body (12), the top of described sensor housing is provided with shell fixing structure (9) and density sensor (1) and liquid level sensor (5) is connected with roof, bottom is provided with weight suspension mouth (8) and lifts for weight and sensor main body.
4. a kind of FBG according to Claims 2 or 3 measures the heavy sensor device of oil tank oil, it is characterized in that: the sensor main body (12) at the upper and lower two ends of described main FBG detection fiber (15) is provided with strain structure for amplifying (14).
5. a kind of FBG according to claim 4 measures the heavy sensor device of oil tank oil, it is characterized in that: described strain structure for amplifying (14) is shaped as frame strain structure for amplifying.
6. a kind of FBG according to Claims 2 or 3 measures the heavy sensor device of oil tank oil, it is characterized in that: the sensor main body (12) of described main FBG detection fiber (15) both sides is provided with the vertical groove that encapsulation fixed temperature compensates FBG optical fiber (17), and described temperature compensation FBG optical fiber (17) and main FBG detection fiber (15) be arranged in parallel.
7. a kind of FBG according to claim 3 measures the heavy sensor device of oil tank oil, it is characterized in that: the bottom of described sensor housing is provided with optical fiber and lays mouth (7).
8. a kind of FBG according to Claims 2 or 3 measures the heavy sensor device of oil tank oil, it is characterized in that: the sensor main body of two density sensors (1) is all fixedly installed in a density sensor housing (18), and two main FBG detection fiber are all vertically arranged.
9. a kind of FBG according to claim 1 measures the heavy sensor device of oil tank oil, it is characterized in that: the right cylinder that described liquid level weight (6) is even material.
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| CN201310404186.2A CN103466234B (en) | 2013-09-06 | 2013-09-06 | Sensor device for utilizing fiber bragg grating (FBG) to measure oil weight of oil tank |
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| CN103466234B true CN103466234B (en) | 2015-07-08 |
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| CN109883882B (en) * | 2019-02-25 | 2020-06-16 | 内蒙古联手创业路桥有限责任公司 | Mud proportion detection device for highway construction |
| CN110375824B (en) * | 2019-08-22 | 2024-03-22 | 黑龙江大学 | Filling station storage tank liquid level and density sensor based on fiber bragg grating |
Citations (8)
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| JPH1111582A (en) * | 1997-06-23 | 1999-01-19 | Showa Aircraft Ind Co Ltd | Loading weigh detector of tank lorry |
| CN2423576Y (en) * | 2000-05-08 | 2001-03-14 | 钟安庸 | Ratio liquid level gauge |
| CN2648416Y (en) * | 2003-10-30 | 2004-10-13 | 关柏鸥 | Fibre-optical grating liquid level sensor |
| CN1743814A (en) * | 2004-09-01 | 2006-03-08 | 关柏鸥 | Optical fiber grating liquid sensor |
| CN101629890A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Float type fiber grating liquid densimeter |
| CN102809521A (en) * | 2012-07-30 | 2012-12-05 | 昆明理工大学 | Float type optical fiber Bragg grating density sensor of Pb-Sn (plumbum-stannum) molten alloy |
| CN202582500U (en) * | 2012-05-03 | 2012-12-05 | 无锡成电光纤传感科技有限公司 | Optical fiber grating strain transducer capable of eliminating external force stretching impact |
| CN203473665U (en) * | 2013-09-06 | 2014-03-12 | 长城信息产业股份有限公司 | Sensor device for measuring oil weight of oil tank through FBG |
-
2013
- 2013-09-06 CN CN201310404186.2A patent/CN103466234B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1111582A (en) * | 1997-06-23 | 1999-01-19 | Showa Aircraft Ind Co Ltd | Loading weigh detector of tank lorry |
| CN2423576Y (en) * | 2000-05-08 | 2001-03-14 | 钟安庸 | Ratio liquid level gauge |
| CN2648416Y (en) * | 2003-10-30 | 2004-10-13 | 关柏鸥 | Fibre-optical grating liquid level sensor |
| CN1743814A (en) * | 2004-09-01 | 2006-03-08 | 关柏鸥 | Optical fiber grating liquid sensor |
| CN101629890A (en) * | 2009-08-17 | 2010-01-20 | 昆明理工大学 | Float type fiber grating liquid densimeter |
| CN202582500U (en) * | 2012-05-03 | 2012-12-05 | 无锡成电光纤传感科技有限公司 | Optical fiber grating strain transducer capable of eliminating external force stretching impact |
| CN102809521A (en) * | 2012-07-30 | 2012-12-05 | 昆明理工大学 | Float type optical fiber Bragg grating density sensor of Pb-Sn (plumbum-stannum) molten alloy |
| CN203473665U (en) * | 2013-09-06 | 2014-03-12 | 长城信息产业股份有限公司 | Sensor device for measuring oil weight of oil tank through FBG |
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Address after: 410100 East Third Road, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Co-patentee after: Changsha HCC HIDEN Technology Co., Ltd. Patentee after: GreatWall Information Industry Co., Ltd. Co-patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Address before: 410100 East Third Road, Changsha Economic and Technological Development Zone, Changsha City, Hunan Province Co-patentee before: Changsha HCC HIDEN Technology Co., Ltd. Patentee before: GreatWall Information Industry Co., Ltd. Co-patentee before: Hunan Haidun Optical Fiber Sensing Technology Engineering Laboratory Co., Ltd. |
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Effective date of registration: 20190808 Address after: 410205 A076, Headquarters Building of Zhongdian Software Park, 39 Jianshan Road, Changsha High-tech Development Zone, Hunan Province Patentee after: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. Address before: 410100 East Road, Changsha economic and Technological Development Zone, Changsha, Hunan, China Co-patentee before: Changsha HCC HIDEN Technology Co., Ltd. Patentee before: GreatWall Information Industry Co., Ltd. Co-patentee before: Hunan the Great Wall Hai Dun Optical Fiber Technology Co., Ltd. |