CN203177924U - Water level monitoring device based on three fiber bragg grating structures - Google Patents
Water level monitoring device based on three fiber bragg grating structures Download PDFInfo
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- CN203177924U CN203177924U CN2012206322857U CN201220632285U CN203177924U CN 203177924 U CN203177924 U CN 203177924U CN 2012206322857 U CN2012206322857 U CN 2012206322857U CN 201220632285 U CN201220632285 U CN 201220632285U CN 203177924 U CN203177924 U CN 203177924U
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Abstract
The utility model relates to a water level monitoring device based on fiber grating technique relates to the measurement and the hydraulic engineering technical field of liquid level. It is constituted as follows: the outputs of the fiber bragg grating strain sensor I, the fiber bragg grating strain sensor II and the fiber bragg grating strain sensor III are connected with the input of the optical switch, the output of the optical switch is connected with the input of the fiber bragg grating demodulator, the output of the fiber bragg grating demodulator is connected with the input of the lower computer, and the output of the lower computer is connected with the wireless communication module I; the output of the wireless communication module II is connected with the input of the upper computer, and the output of the upper computer is connected with the remote real-time receiving of data signals, the analysis and processing of the data signals and the dynamic display of the change curve. The utility model discloses turn into the change of fiber grating dependent variable with the water level change, realize high sensing precision, high measurement accuracy, low cost and the automatic real-time supervision to the water level.
Description
Technical field
The utility model is a kind of Level monitor based on Fiber Bragg Grating technology, relates to measurement and the hydraulic engineering technical field of liquid level.
Background technology
Water level is as one of basic hydrographic features of indicating river, reservoir area flood situation, being one of project the most basic in the important component part of regimen information and the hydrologic survey, also is major parameter and the important evidence of dike storehouse dam safety, water conservancy irrigation and drainage, retaining flood discharge, flood control scheduling and flood forecasting.One of basic demand that improves flood forecasting, forecast flood path and check the floods just is the accurate measurement of water level.If do not carry out effective water level monitoring in advance, then running under the anomalous weather situations such as flood, typhoon, cause because water level reaches warning line that Jiang Di bursts, big flood destroys by rush of water, and serious accidents such as dykes and dams, bank landslide, storehouse happen occasionally, bring tremendous loss for thus the country and people's lives and properties.
Existing level measuring has adopted various sensor technologies, common have float type level meter, pressure resistance type water level meter, air bubble type water level meter, an electronics water gauge etc., though these traditional monitoring modes can be realized level measuring, but all there is certain limitation, not high as monitoring accuracy, system's consumptive material is many, power consumption is big, antijamming capability is low, easily wear out or suffer burn into wearing and tearing etc., and scalability is poor, it is loaded down with trivial details to connect up, I﹠M complexity etc.; For some emerging contactless water level meters, as radar type, laser type, sound wave type etc., though have characteristics such as measuring accuracy height, range are big, advanced technology, but price is relatively costly, to equipment installation requirement height, measurement range is subjected to the restriction of detection angle, and rate of occurrence of equipment failure and rate of false alarm height need regularly calibration.
Fiber grating is fiber optic passive device with the fastest developing speed in recent years.It is a kind of space periodicity index distribution of utilizing the light sensitive characteristic of fiber optic materials to set up at the fibre core of optical fiber, its role is to change or control light in this regional dissemination mode.Except have the anti-electromagnetic interference (EMI) of ordinary optic fibre, size is little, in light weight, intensity is high, the characteristics such as high temperature resistant, corrosion-resistant, fiber grating also has its unique characteristic: be easy to little with optically-coupled, coupling loss, be easy to wavelength-division multiplex etc.Thereby make fiber grating in fields such as optical-fibre communications and Fibre Optical Sensors wide prospect be arranged.As a kind of emerging technology of photon research field, be that the sensing technology of pedestal sensor spare is subjected to common concern in recent years with the fiber grating, the various countries researcher actively develops relevant research work.At present, the physical quantity that the fiber-optic grating sensor of having reported can be monitored has: temperature, strain, pressure, displacement, pressure, torsional angle, moment of torsion (twisting stress), acceleration, electric current, voltage, magnetic field, frequency, concentration, thermal expansivity, vibration etc., wherein a part of fiber grating sensing system practical application.
Fiber Bragg Grating FBG (Fiber Bragg Grating) is simple, the most general a kind of fiber grating.It is that one section refractive index is periodically variable optical fiber, and its index modulation degree of depth and grating cycle generally all are constants.The variation of temperature, strain can cause cycle and the change of refractive of Fiber Bragg Grating FBG, thereby the reflectance spectrum of Fiber Bragg Grating FBG and transmission spectrum are changed.The variation of reflectance spectrum and transmission spectrum by the detection fiber Bragg grating just can obtain the information of corresponding temperature and strain, and Here it is measures the ultimate principle of temperature and strain with Fiber Bragg Grating FBG.
By coupled mode theory as can be known, Fiber Bragg Grating FBG can be coupled to another guided mode that transmits in opposite direction with a guided mode that wherein transmits and form narrowband reflection uniformly, and peak reflectance wavelength (bragg wavelength) λ w is:
λ
w＝2n
effΛ （1）
In the formula: λ
wBe bragg wavelength; n
EffEffective refractive index for the spread fiber pattern; Λ is grating pitch.
Can get the centre wavelength of grating and the relation of temperature and strain to formula (1) differential:
In the formula: α
fThermal expansivity for optical fiber; ξ is the thermo-optical coeffecient of fiber optic materials; P
eElasto-optical coefficient for fiber optic materials.By formula (2) as can be known, strain stress is because the flexible and elasto-optical effect in Fiber Bragg Grating FBG cycle causes the variation of bragg wavelength, and temperature T is because Fiber Bragg Grating FBG thermal expansion effects and thermo-optic effect cause the variation of bragg wavelength.
Fiber grating can be made into various senser elements, is used widely at sensory field.Compare with traditional electric transducer, fiber-optic grating sensor has own unique advantage: (1) sensing head is simple in structure, volume is little, in light weight, shape variable, be fit to imbed in the various large scale structures, can measure stress, strain and the structural damage etc. of inside configuration, stability, good reproducibility; (2) and have natural compatibility between the optical fiber, easily be connected with optical fiber, the light loss consumption is low, spectral characteristic good, reliability is high; (3) have non-conducting, little to measured medium influence, have characteristics anticorrosive, anti-electromagnetic interference (EMI) again, be adapted at working in the rugged surroundings; (4) light and handy soft, can in an optical fiber, write a plurality of gratings, constitute sensor array, combine with wavelength-division multiplex and time division multiplex system, realize distributed sensing; (5) metrical information is with Wavelength-encoding, thereby fiber-optic grating sensor is not subjected to the influence of factors such as light-intensity variation, optical fiber connection and coupling loss, the optical polarization variation of light source, the antijamming capability that tool is stronger; (6) high sensitivity, high degree of resolution.
Compare with widely used Brillouin light domain reflectometer BOTDR, the advantage of fiber-optic grating sensor has: (1) can accurately locate measurement point, the resolution height; (2) cost is low; (3) can process, encapsulate transducing part, make it be more suitable for on-the-spot rugged surroundings.
Literature survey and new patent searching show, the water level based on Fiber Bragg Grating technology, the level monitoring method and system reported at present, be based on semi-girder more, excellent principle suspends, utilize single fiber Bragg grating strain sensor to measure, it is bigger that the precision of measurement result is influenced by stochastic error, the water level monitoring method and apparatus based on three optical fiber grating structures that the present invention proposes has not yet to see open report.
The utility model content
The purpose of this utility model be design a kind of with SEA LEVEL VARIATION be converted into the fiber grating strain amount change, realize the Level monitor based on three optical fiber grating structures to high sensing accuracy, high measurement accuracy, low cost and the auto-real-time monitoring of water level.
The utility model proposes a kind of water level automated watch-keeping facility based on three optical fiber grating structures.Monitoring device as shown in Figure 1, a metal plate 1 usefulness bolt I 2, bolt II 3 are fixed in the bank, river course, at metal plate 1 protection cylinder 4 is installed, and protection cylinder 4 placed the river course vertically downward, fiber grating level measuring case 5 is fixed in protection cylinder 4 walls, and be connected with optical Fiber Closure 7 by optical cable I 6, optical Fiber Closure 7 is connected with the optical cable II 8 that causes the monitoring station; In the monitoring station, optical cable II 8 is connected in series photoswitch 9, fiber Bragg grating (FBG) demodulator 10, slave computer 11 successively, and slave computer 11 outputs connect wireless communication module I 12, and 13 outputs of wireless communication module II connect the input of host computer 14.
The structure of fiber grating level measuring case 5 as shown in Figure 2, its main body is a closed stainless steel casing 15, thin-wall steel tube 16 of portion's vertical fixing within it, on each monitoring cross section of thin-wall steel tube 16,90 ° of directions are evenly arranged three temperature compensating type fiber Bragg grating strain sensors at interval, be respectively fiber Bragg grating strain sensor I 17, fiber Bragg grating strain sensor II 18, fiber Bragg grating strain sensor III 19, three sensors are connected by welding, fiber Bragg grating strain sensor III 19 is connected with optical Fiber Closure 7 by optical cable I 6, and its floor plan mode as shown in Figure 3.Fiber Bragg grating strain sensor I 17, fiber Bragg grating strain sensor II 18, the output signal of fiber Bragg grating strain sensor III 19 is through photoswitch 9 conducting one by one, transfer to fiber Bragg grating (FBG) demodulator 10, (FBG) demodulator 10 demodulates the centre wavelength displacement of each fiber Bragg grating strain sensor, transfer to slave computer 11, slave computer 11 calls self-editing program, control photoswitch 9 and (FBG) demodulator 10, realize the collection of data and data are carried out pre-service, pretreated data are by 12 transmission of wireless communication module I, wireless communication module II 13 receives and passes to host computer 14,14 pairs of pretreated data of host computer are carried out Treatment Analysis, and show the water level monitoring result in real time by diagrammatic form.
The principle of this monitoring device as shown in Figure 5, the output of fiber Bragg grating strain sensor I, fiber Bragg grating strain sensor II and fiber Bragg grating strain sensor III connects the input of photoswitch, the output of photoswitch connects the input of fiber Bragg grating (FBG) demodulator, the output of fiber Bragg grating (FBG) demodulator connects the input of slave computer, and the output of slave computer connects the wireless communication module I; The output of wireless communication module II connects the input of host computer, and the output of host computer connects the reception of data-signal remote live, data signal analysis dynamically shows with processing and change curve.
The electric principle of this monitoring device as shown in Figure 6, the fiber Bragg grating strain sensor I, the PC joint of fiber Bragg grating strain sensor II and fiber Bragg grating strain sensor III is connected with the PC joint of photoswitch with optical cable respectively, the PC interface of photoswitch connects the PC interface of fiber Bragg grating (FBG) demodulator, the LAN port of fiber Bragg grating (FBG) demodulator connects the LAN port of slave computer, the R232 serial ports of slave computer connects the R232 serial ports of wireless communication module I, wireless communication module is through antenna GSM, wireless communication networks, received the R232 serial ports of host computer after the antenna GSM of another wireless communication module II reception by the R232 serial ports, the output of host computer is by the VGA end of VGA termination display.
The water level automated watch-keeping facility based on three optical fiber grating structures that the utility model proposes, have the measuring accuracy height, anti-interference, corrosion-resistant, characteristics such as simple and easy are installed, be easy to realize automatic collection and the remote transmission of Monitoring Data, with respect to traditional water level monitoring technology such as float-type, pressure resistance type, bubble type and electronics water gauges, improved monitoring efficient and precision, reduced the monitoring cost.
Description of drawings
Fig. 1 monitoring device pie graph
Fig. 2 fiber grating level measuring case pie graph
Fig. 3 sensor plane of arrangement synoptic diagram
Fig. 4 sensor plane of arrangement coordinate diagram
Fig. 5 Level monitor schematic diagram
Fig. 6 Level monitor electrical schematic diagram
Wherein
1-metal plate, 2-bolt I
3-bolt II, 4-protection cylinder
5-fiber grating level measuring case, 6-optical cable I
7-optical Fiber Closure, 8-optical cable II
9-photoswitch, 10-optical fiber (FBG) demodulator
11-slave computer, 12-wireless communication module I
13-wireless communication module II, 14-host computer
15-stainless steel seal case, 16-thin-wall steel tube
17-fiber Bragg grating strain sensor I, 18-fiber Bragg grating strain sensor II
19-fiber Bragg grating strain sensor III
Embodiment
Embodiment. this example is a kind of monitoring device and this device construction method, and it constitutes as Fig. 1-shown in Figure 6.This monitoring device has carried out site test respectively in Cheng County, Longnan City, Gansu Province Tan river township Pu Bahe, Lang Ping river, Lang Ping town, Tujia Autonomous County of Changyang, Hubei Province, these two test sections all belong to road, small watershed stream among the typical case of mountain area, and the river course SEA LEVEL VARIATION is fairly obvious in low water season and flood season.
This monitoring device is divided into on-site data gathering and transmission and long-range reception and data analysis system (as shown in Figure 6), specifically comprises the remote monitoring center of fiber grating level measuring case, field monitoring station, wireless communication module and office.The overall formation of this monitoring device as shown in Figure 1, a metal plate 1 usefulness bolt I 2, II 3 are fixed in the bank, river course, at metal plate 1 protection cylinder 4 is installed, and protection cylinder 4 placed the river course vertically downward, fiber grating level measuring case 5 is fixed in protection cylinder 4 walls, and be connected with optical Fiber Closure 7 by optical cable I 6, optical Fiber Closure 7 is connected with the optical cable II 8 that causes the monitoring station; In the monitoring station, photoswitch 9 is connected with fiber Bragg grating (FBG) demodulator 10, and (FBG) demodulator 10 is connected with slave computer 11, and slave computer 11 outputs connect wireless communication module I 12, and 13 outputs of wireless communication module II connect the input of host computer 14.
The structure of fiber grating level measuring case 5 as shown in Figure 2, its main body is a closed stainless steel casing 15, thin-wall steel tube 16 of portion's vertical fixing within it, on each monitoring cross section of steel pipe 16,90 ° of directions are evenly arranged three temperature compensating type fiber Bragg grating strain sensors at interval, be respectively fiber Bragg grating strain sensor I 17, fiber Bragg grating strain sensor II 18,19, three sensors of fiber Bragg grating strain sensor III and connect by welding, its floor plan mode as shown in Figure 3.The output signal of three fiber Bragg grating strain sensors is through photoswitch 9 conducting one by one, transfer to fiber Bragg grating (FBG) demodulator 10, (FBG) demodulator 10 demodulates the centre wavelength displacement of each fiber Bragg grating strain sensor, transfer to slave computer 11, slave computer 11 calls self-editing program, control photoswitch 9 and (FBG) demodulator 10, realize the collection of data and data are carried out pre-service, pretreated data are by 12 transmission of wireless communication module I, wireless communication module II 13 receives host computer 14,14 pairs of pretreated data of host computer are carried out Treatment Analysis, and show the water level monitoring result in real time by diagrammatic form.
The electric principle of this monitoring device as shown in Figure 6, fiber Bragg grating strain sensor I 17, fiber Bragg grating strain sensor II 18, the PC joint of fiber Bragg grating strain sensor III 19 is connected with the PC joint of photoswitch 9 with optical cable, the R232 of photoswitch 9 connects the R232 interface of slave computer 11, the PC joint of photoswitch 9 connects the CH1 end of fiber Bragg grating (FBG) demodulator 10SM125, the LAN port of fiber Bragg grating (FBG) demodulator 10SM125 connects the LAN port of slave computer 11, the R232 port of slave computer 11 connects the R232 port of wireless communication module I 12 Siemens MC 35i, wireless communication module I 12 is through antenna GSM, GPRS network, received the R232 of host computer 14 after the wireless communication module II 13 antenna GSM reception by R232, the output of host computer 14 is by the VGA end of VGA termination display.
Fiber Bragg grating strain sensor I 17, fiber Bragg grating strain sensor II 18, the output signal of fiber Bragg grating strain sensor III 19 is through photoswitch 9 conducting one by one, transfer to fiber Bragg grating (FBG) demodulator 10, (FBG) demodulator 10 demodulates the centre wavelength displacement of three fiber Bragg grating strain sensors, transfer to slave computer 11,11 pairs of data of slave computer are carried out pre-service, and the data after will handling are defeated by wireless communication module I 12, wireless communication module I 12 is transferred to the remote monitoring center that is positioned at office with the data of slave computer 11 analyzing and processing by public's cordless communication network, and Surveillance center comprises following two parts:
(1) the wireless communication module II 13, are used for receiving the Monitoring Data of wireless communication module I 12 transmissions that are positioned at the field monitoring station, and are transferred to host computer 14, send feedback commands also can for on-site wireless communication module I 12;
(2) host computer 14 and program are used for the signal of download terminal wireless communication module II 13, and call self-compiling program Monitoring Data is carried out analyzing and processing, and by display water level shown in real time with diagrammatic form.
In the above-mentioned monitoring device:
Temperature compensating type fiber Bragg grating strain sensor: BGK-FBG-4150;
The light switch: light swells SUM-FSW;
Fiber Bragg grating (FBG) demodulator: SM125;
Wireless communication module: Siemens MC 35i;
Host computer and slave computer: grind magnificent IPC-610;
Software program: independent development.
The Level monitor that this example is set up has been given full play to the characteristics that the fiber Bragg grating strain sensor volume is little, precision is high, and structure is simple and direct reliable, purpose of design is clear and definite, and is flexible for installation, easy for operation, maintaining is simple, is a kind of advanced person, economic, practical water level automated watch-keeping facility.Prove by the long monitoring of carrying out in Cheng County, Longnan City, Gansu Province Tan river township Pu Bahe, two testing sites, Lang Ping river, Lang Ping town, Tujia Autonomous County of Changyang, Hubei Province, this monitoring device is easy to the river water level of remote mountain areas is carried out long-time, continual real time on-line monitoring, and to the automatic collection of Monitoring Data and remote transmission, issue, avoided loaded down with trivial details artificial image data, monitoring accuracy and the efficient of water level have been improved, reduced the monitoring cost, the specific aim of mountain area flood disaster prediction forecast work, validity are increased.The utility model can be widely used in rivers, lake, reservoir, dykes and dams, river mouth, channel, key water control project and various hydraulic structures place level measuring, has broad application prospects.
Claims (4)
1. Level monitor based on three optical fiber grating structures, it is characterized in that totally constituting of monitoring device: the output of fiber Bragg grating strain sensor I, fiber Bragg grating strain sensor II and fiber Bragg grating strain sensor III connects the input of photoswitch, the output of photoswitch connects the input of fiber Bragg grating (FBG) demodulator, the output of fiber Bragg grating (FBG) demodulator connects the input of slave computer, and the output of slave computer connects the wireless communication module I; The output of wireless communication module II connects the input of host computer.
2. a kind of Level monitor based on three optical fiber grating structures according to claim 1, it is characterized in that specifically constituting: with a metal plate (1) bolt I (2), bolt II (3) is fixed in the bank, river course, at metal plate (1) protection cylinder (4) is installed, and protection cylinder (4) placed the river course vertically downward, in inciting somebody to action fiber Bragg grating strain sensor I (17) is arranged, fiber Bragg grating strain sensor II (18), the fiber grating level measuring case (5) of fiber Bragg grating strain sensor III (19) is fixed in protection cylinder (4) wall, and be connected with optical Fiber Closure (7) by optical cable I (6), optical Fiber Closure (7) is connected with the optical cable II (8) that causes the monitoring station; In the monitoring station, optical cable II (8) is connected in series photoswitch (9), fiber Bragg grating (FBG) demodulator (10), slave computer (11) successively, slave computer (11) output connects wireless communication module I (12), and wireless communication module II (13) output connects the input of host computer (14).
3. a kind of Level monitor based on three optical fiber grating structures according to claim 1, the electric principle that it is characterized in that monitoring device is: the fiber Bragg grating strain sensor I, the PC joint of fiber Bragg grating strain sensor II and fiber Bragg grating strain sensor III is connected with the PC joint of photoswitch with optical cable respectively, the PC interface of photoswitch connects the PC interface of fiber Bragg grating (FBG) demodulator, the LAN port of fiber Bragg grating (FBG) demodulator connects the LAN port of slave computer, the R232 serial ports of slave computer connects the R232 serial ports of wireless communication module I, wireless communication module is through antenna GSM, wireless communication networks, received the R232 serial ports of host computer after the antenna GSM of another wireless communication module II reception by the R232 serial ports, the output of host computer is by the VGA end of VGA termination display.
4. a kind of Level monitor based on three optical fiber grating structures according to claim 2, the structure that it is characterized in that described fiber grating level measuring case (5) is: its main body is a closed stainless steel casing (15), a thin-wall steel tube of portion's vertical fixing (16) within it, on each monitoring cross section of thin-wall steel tube (16), 90 ° of directions are evenly arranged three temperature compensating type fiber Bragg grating strain sensors at interval, be respectively fiber Bragg grating strain sensor I (17), fiber Bragg grating strain sensor II (18), fiber Bragg grating strain sensor III (19), three sensors are connected by welding, and fiber Bragg grating strain sensor III (19) is connected with optical Fiber Closure (7) by optical cable I (6).
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| CN2012206322857U CN203177924U (en) | 2013-03-19 | 2013-03-19 | Water level monitoring device based on three fiber bragg grating structures |
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| CN2012206322857U CN203177924U (en) | 2013-03-19 | 2013-03-19 | Water level monitoring device based on three fiber bragg grating structures |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007370A (en) * | 2017-10-24 | 2018-05-08 | 重庆建工第三建设有限责任公司 | A kind of fiber Bragg grating strain sensor installs monitoring system |
| CN110887774A (en) * | 2019-11-18 | 2020-03-17 | 武汉理工大学 | Sponge city permeable pavement water level monitoring system based on fiber bragg grating |
| CN111897375A (en) * | 2020-07-31 | 2020-11-06 | 长江三峡通航管理局 | Ship lock operation dynamic water level monitoring system and monitoring method |
| CN116295649A (en) * | 2023-03-24 | 2023-06-23 | 广东省源天工程有限公司 | Water conservancy monitoring system of flood discharge gate chute section |
-
2013
- 2013-03-19 CN CN2012206322857U patent/CN203177924U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108007370A (en) * | 2017-10-24 | 2018-05-08 | 重庆建工第三建设有限责任公司 | A kind of fiber Bragg grating strain sensor installs monitoring system |
| CN110887774A (en) * | 2019-11-18 | 2020-03-17 | 武汉理工大学 | Sponge city permeable pavement water level monitoring system based on fiber bragg grating |
| CN111897375A (en) * | 2020-07-31 | 2020-11-06 | 长江三峡通航管理局 | Ship lock operation dynamic water level monitoring system and monitoring method |
| CN111897375B (en) * | 2020-07-31 | 2021-07-06 | 长江三峡通航管理局 | Ship lock operation dynamic water level monitoring system and monitoring method |
| CN116295649A (en) * | 2023-03-24 | 2023-06-23 | 广东省源天工程有限公司 | Water conservancy monitoring system of flood discharge gate chute section |
| CN116295649B (en) * | 2023-03-24 | 2024-02-27 | 广东省源天工程有限公司 | Water conservancy monitoring system of flood discharge gate chute section |
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