CN203053517U - Fiber Bragg grating water-soil interface sensor - Google Patents
Fiber Bragg grating water-soil interface sensor Download PDFInfo
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- CN203053517U CN203053517U CN 201320030033 CN201320030033U CN203053517U CN 203053517 U CN203053517 U CN 203053517U CN 201320030033 CN201320030033 CN 201320030033 CN 201320030033 U CN201320030033 U CN 201320030033U CN 203053517 U CN203053517 U CN 203053517U
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Abstract
The utility model discloses a fiber Bragg grating water-soil interface sensor which comprises a fixing frame and a piezometric tube. The fixing support is used for protecting and fixing the piezometric tube which comprises a tube body and a series of fiber Bragg grating sensing probes distributed at intervals according to depths. The sensing probes are constructed in a double-face mode. The front faces of the sensing probes bear water-soil pressure outside the tube, the back faces of the sensing probes bear water pressure in the tube, the pressure difference between the front faces and the back faces of the probes is measured, so that lateral soil pressure outside the tube can be accurately measured, the lateral soil pressure at different depths is then subjected to fitting calculation, and finally the depth position of a water-soil interface is obtained. The fiber Bragg grating water-soil interface sensor is not affected by water body turbulent flow and soil body moving, testing accuracy is high, testing accuracy and testing depth range can be changed according to using conditions and requirements, fiber Bragg grating water-soil interface sensors can be implanted into a plurality of monitoring positions according to monitoring requirements, and scouring and silting monitoring on one zone can be achieved.
Description
Technical field
The utility model relates to a kind of building hydraulic engineering monitoring device, is specifically related to a kind of fiber grating water and soil interface sensor.
Background technology
It is one of ruined major reason of bridge structure by erosion gradually that current make near the basis the bridge pier to washing away of pile foundation.Bridge pier plays inhibition for current usually, and then causes near the too fast and generation whirlpool of flow rate of water flow bridge pier, and the basis makes bridge be in unsafe state near the erosion bridge pier.Bridge band under this state hidden danger work, is difficult to again be found.In case bridge is owing to wash away generation destruction, this destruction belongs to brittle rupture, has emergentness, can lead to grave consequences.River dike is the important component part of China's flood-prevention project system on the other hand.All kinds of dyke 250,000 km are had in China at present, wherein main dyke 6.75 ten thousand km.China's dyke generally is close to the river and builds the dike line options and be subjected to the restriction of river potential condition, and ground mostly is unconsolidated sediment in the Quaternary period, and its material composition, distribution and variation in thickness are big, the geologic condition complexity.The bank erosion in China river and alluvial phenomenon are very general, as the levee toe scour of the bank erosion of the middle and lower reach of Yangtze River, embankment dangerous section, northern river etc., and bank erosion serious threat dyke safety.Therefore, wash away and the destruction that bridge and embankment are caused of depositing has become the focus of research.
Present wash away and the monitoring method of depositing mainly contains artificial pit gauge, sonar, radar and domain reflectometer (TDR) etc., but these methods have very big limitation in practical engineering application, shortcomings such as off-line, precision are low such as having, poor stability, cost height and sensing element poor durability are difficult in real time, accurately monitor washing away and the alluvial state of pile foundation and embankment.
Fiber grating sensing technology is except essential explosion-proof, anticorrosive, anti-electromagnetic interference (EMI) with ordinary optic fibre sensing technology, to many advantages such as electrical isolation, no electrical transmission, also have some obviously to be better than the characteristics of other optical fiber sensing technology: the digital sense of Wavelength-encoding, the dependability height, life-span is long, can carry out the long-term safety monitoring.Because above advantage, optical fiber measurement has been widely used in the health monitoring of structure at present.By consulting and analyzing relevant patent documentation both domestic and external, both at home and abroad to based on fiber grating wash away and the monitoring system research of depositing less, present domestic Southeast China University has developed a kind of long gauge length optical fibre grating scour sensor, and this sensor comprises Elastic Straight and the long gauge length optical fibre grating sensing linear transducer array that is packaged as a whole with Elastic Straight.Its principle is to utilize current to the Elastic Straight effect and make the long gauge length optical fibre grating wavelength that is positioned at the mud layer top be laid on the Elastic Straight by effects of strain bigger variation take place, thereby obtains scour depth.But this method is subjected to the defeated interference that moves of the soil body under water easily.Dalian University of Technology has developed a kind of scour sensor based on fiber grating, its sensing probe is in case owing to washing away when exposing the riverbed, the sensor both sides will produce flowing pressure, the diaphragm of sensing probe device both sides produces distortion, the motion of drivening rod, and drive the interior beam of uniform strength generation deflection of device then, and monitor its strain by the fiber grating that is encapsulated on the beam of uniform strength, thus judge to have or not and wash away.Its principle is owing to cylinder in moving water streams, and produces positive and negative flowing pressure respectively at its fluoran stream surface and lee side, makes the beam of uniform strength deform.But this sensor is popped one's head in restricted number, can't measure water pedosphere face position, being subjected under water easily, turbulent flow disturbs.
Summary of the invention
The purpose of this utility model is to provide a kind of to be had pinpoint accuracy, high-durability, temperature self-adaptation and can resist the defeated fiber grating water and soil interface sensor of interference that moves of water and soil, in order to monitoring under water because wash away, water and soil interface depth variation that effect such as alluvial causes.
The technical solution that realizes the utility model purpose is: a kind of fiber grating water and soil interface sensor comprises fixed mount and piezometric tube, and fixed mount comprises protection section and anchoring section; Anchoring section is positioned at protection section bottom.The anchoring section end face circumferentially has pickup groove, is used for when fiber grating water and soil interface sensor is installed fixedly steel casing, protects section within the pickup groove scope; Piezometric tube comprises piezometric tube pipe shaft, the optical fiber grating sensing probe that porous disc is identical with several, and is provided with water filling port; Porous disc is fixed on a side of piezometric tube pipe shaft, and other three sides are longitudinally arranged several identical optical fiber grating sensing probes respectively, and water filling port is welded on the top of piezometric tube pipe shaft; Piezometric tube is fixed in the protection section of fixed mount.The protection section is the lattice pipe support that is welded by L shaped shaped steel; Anchoring section is conical, and end face is provided with circular pickup groove, and the protection section is within the pickup groove scope.
Piezometric tube vertically is installed in the fixed mount protection section, and the piezometric tube pipe shaft is square (also can adopt circle), the bottom surface sealing, and end face is established closed water filling port; In four sides a side being arranged is permeable, is made up of porous disc; Other three sides are sensitive face, longitudinally evenly arrange identical optical fiber grating sensing probe, bear the water pressure in the outer water and soil pressure of pipe and the pipe.
At different hydrogeological conditions and measurement requirement, the form of optical fiber grating sensing probe has two kinds: monofilm formula sensing probe and dual-membrane type sensing probe.
Monofilm formula sensing probe comprises panel, the back of the body ring, pressure measurement film, waterproof membrane, is scribed at fiber grating, first nut and second nut on the optic fibre wire; One end of optic fibre wire links to each other with fiber grating, and the other end is drawn from back of the body ring; Fiber grating is bonded in the middle part of pressure measurement film and waterproof membrane inboard; Have a circle hole on the panel, circle hole area is 1/2 ~ 4/5 of panel area, back of the body ring is the metal ring plate, the interior diameter of back of the body ring is identical with circle hole interior diameter, pressure measurement film and waterproof membrane are fixed between panel and the back of the body ring, panel is fixedlyed connected by first nut with back of the body ring, and monofilm formula sensing probe is fixed on the piezometric tube pipe shaft by second nut.
The dual-membrane type sensing probe comprises two identical pressure transmission parts and a sensing element, and the pressure transmission parts comprise and are subjected to pressure shell, inner membrance and silicone oil; Being subjected to pressure shell is one-time formed crown cap, and pressurized cap face is subjected to pressure shell inwall side to have a circle groove near blind end as adventitia, and inner membrance is welded on this groove outward flange; Filled with silicone oil is at inner membrance and be subjected between the pressure shell blind end; Sensing element comprises pressure transmission sheet, equi intensity cantilever, bearing, fiber grating and optic fibre wire; The narrow end of equi intensity cantilever inserts in the pressure transmission sheet, and wide end upper and lower surface is stained with two identical bearings respectively, and the middle part upper and lower surface is stained with fiber grating respectively; Optic fibre wire one end links to each other with fiber grating, the other end from above-mentioned fiber grating homonymy and be subjected to draw the pressure shell; Sensing element is positioned at two identical pressure transmission parts middle parts, and two identical pressure transmission parts and a sensing element pressing encapsulation are formed the dual-membrane type sensing probe.
Generally speaking, monofilm formula sensing probe is used for the monitoring of shallow-water environment, and the dual-membrane type sensing probe is used for the monitoring of deepwater environment, also can select according to actual conditions.
The utility model compared with prior art, its remarkable advantage:
(1) measuring principle of the present utility model is simple and reliable, be not subject to the defeated interference that moves of water and soil: the sensor in water, it is water pressure in the pipe, and be the defeated water pressure of moving generation of water body outside the pipe, so what the optical fiber grating sensing probe measurement obtained might be normal pressure (stream interface meets water), also may be negative pressure (backwater stream wash surface).Sensor in soil, owing to be subjected to the effect of soil pressure, no matter which type of variation takes place in current, what its optical fiber grating sensing probe measurement obtained all is normal pressure, if defeated moving appears in the soil body, also only can cause the soil lateral pressure bigger than earth pressure at rest at both directions at most, always have one only not to be subjected to the defeated interference that moves of the soil body at three sensors of sustained height.Therefore, defeated only the moving of water body can be caused positive and negative change to the probe in the water, and without any interference, and the soil body is failed the interference that moves and also can be offset by three sensors of sustained height to the sensor in the soil;
(2) fiber grating water and soil of the present utility model interface sensor production technology is simple.The utility model mainly contains the piezometric tube of fixed mount and a plurality of optical fiber grating sensing probe composition, makes simply, and is easy for installation, has broad application prospects and good economic benefit;
(3) measuring accuracy height of the present utility model, its measuring accuracy can reach 0.1m, and can change precision according to specific requirement, and its precision mainly can be by changing optical fiber grating sensing probe quantity and the realization of probe spacing size;
(4) the utility model need not the installation site is limited, as long as guarantee to have the optical fiber grating sensing probe of two different depths in soil layer;
(5) the utility model can carry out flushing monitoring simultaneously to multiple spot, can be according to monitoring requirements, implant fiber grating water and soil interface sensor in a plurality of monitoring points, the integral body that realizes the zone monitoring of washing away and deposit.
Description of drawings
Fig. 1 is fiber grating water and soil of the present invention interface Fundamentals of Sensors figure.
Fig. 2 is fixed rack structure synoptic diagram of the present invention; Wherein Fig. 2 (a) is the fixed mount front view, and Fig. 2 (b) is fixed mount 1-1 sectional view, and Fig. 2 (c) is fixed mount 2-2 sectional view.
Fig. 3 is piezometric tube structural representation of the present invention; Wherein Fig. 3 (a) is the piezometric tube front view, and Fig. 3 (b) is piezometric tube 1-1 sectional view.
Fig. 4 is monofilm formula sensing probe structural representation of the present invention; Wherein Fig. 4 (a) is monofilm formula sensing probe rear view, and Fig. 4 (b) is monofilm formula sensing probe right view.
Fig. 5 is dual-membrane type sensing probe structural representation of the present invention.
Each label among the figure: protection section 1, anchoring section 2, pickup groove 21, piezometric tube pipe shaft 3; optical fiber grating sensing probe 31, panel 3110, back of the body ring 3111, pressure measurement film 3112; waterproof membrane 3113, the first nuts 3114, the second nuts 3115 are subjected to pressure shell 3120; silicone oil 3122, inner membrance 3123, pressure transmission sheet 3124; equi intensity cantilever 3125, bearing 3126, fiber grating 313; optic fibre wire 314, porous disc 32, water filling port 33.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail.
In conjunction with Fig. 1, Fig. 2 and Fig. 3, a kind of fiber grating water and soil of the present utility model interface sensor comprises fixed mount and piezometric tube; Fixed mount comprises protection section 1 and anchoring section 2, and anchoring section 2 is fixed on protection section 1 bottom.Protection section 1 is the lattice pipe support that is welded by L shaped shaped steel; Anchoring section 2 is steel circular cone tube, and end face is provided with circular pickup groove 21, and protection section 1 is within pickup groove 21 scopes.Piezometric tube comprises piezometric tube pipe shaft 3, the optical fiber grating sensing probe 31 that porous disc 32 is identical with several, and is provided with water filling port 33; Porous disc 32 is fixed on a side of piezometric tube pipe shaft 3, and other three sides are longitudinally arranged several identical optical fiber grating sensing probes 31 respectively, and water filling port 33 is welded on the top of piezometric tube pipe shaft 3, and water filling port 33 is salable; Piezometric tube is fixed in the protection section 1 of fixed mount.
Optical fiber grating sensing probe 31 can be divided into monofilm formula sensing probe and dual-membrane type sensing probe according to form.
In conjunction with Fig. 4, monofilm formula sensing probe comprises panel 3110, back of the body ring 3111, pressure measurement film 3112, waterproof membrane 3113, is scribed at fiber grating 313, first nut 3114 and second nut 3115 on the optic fibre wire 314; One end of optic fibre wire 314 links to each other with fiber grating 313, and the other end is drawn from back of the body ring 3111; Fiber grating 313 is bonded in the middle part of pressure measurement film 3112 and waterproof membrane 3113 inboards; Have a circle hole on the panel 3110, circle hole area is 1/2 ~ 4/5 of panel 3110 areas, back of the body ring 3111 is the metal ring plate, the interior diameter of back of the body ring 3111 is identical with circle hole interior diameter, pressure measurement film 3112 and waterproof membrane 3113 are fixed between panel 3110 and the back of the body ring 3111, panel 3110 and back of the body ring 3111 are fixedlyed connected by first nut 3114, and monofilm formula sensing probe is fixed on the piezometric tube pipe shaft 3 by second nut 3115.
In conjunction with Fig. 5, the dual-membrane type sensing probe comprises two identical pressure transmission parts and a sensing element, and the pressure transmission parts comprise and are subjected to pressure shell 3120, inner membrance 3123 and silicone oil 3122; Be subjected to pressure shell 3120 to be one-time formed crown cap, be subjected to the capping of pressure shell 3120 as adventitia, be subjected to pressure shell 3120 inwall sides to have a circle groove near blind end, inner membrance 3123 is welded on this groove outward flange; Silicone oil 3122 is filled in inner membrance 3123 and is subjected between pressure shell 3120 blind ends; Sensing element comprises pressure transmission sheet 3124, equi intensity cantilever 3125, bearing 3126, fiber grating 313 and optic fibre wire 314; Equi intensity cantilever 3125 narrow ends insert in the pressure transmission sheet 3124, and wide end upper and lower surface is stained with two identical bearings 3126 respectively, and the middle part upper and lower surface is stained with fiber grating 313 respectively; Optic fibre wire 314 1 ends link to each other with fiber grating 313, and the other end is from the bearing 3126 of above-mentioned fiber grating 313 homonymies be subjected to draw the pressure shell 3120; Sensing element is positioned at two identical pressure transmission parts middle parts, and two identical pressure transmission parts and a sensing element pressing encapsulation are formed the dual-membrane type sensing probe.
The optical fiber grating sensing precision that 31 quantity can actual request for utilization of popping one's head in arranges, and its optic fibre wire 314 is drawn at piezometric tube pipe shaft 3 tops.The piezometric tube that encapsulation forms has good permanance to environment.
This is in conjunction with Fig. 1 and Fig. 3, the fabrication and installation method of the fiber grating water and soil interface sensor of utility model,, comprise following step:
(a1) make fixed mount protection section 1 and anchoring section 2, anchoring section 2 is fixed on protection section 1 bottom;
(a2) make piezometric tube pipe shaft 3, pipe shaft 3 tops arrange can closed water filling port 33, and porous disc 32 is installed in a side of pipe shaft 3, and the installation window of sensing probe 31 is longitudinally offered in other three sides;
(a3) make optical fiber grating sensing probe 31, optical fiber grating sensing probe 31 longitudinally is fixed on the piezometric tube pipe shaft 3 successively, optic fibre wire 314 is drawn from the top;
(a4) piezometric tube is installed in the fixed mount protection section 1 the top bolt;
(a5) the moderate hollow steel casing of a thickness is enclosed within the fixed mount outside, wherein the interior diameter of steel casing is greater than the overall diameter of protection section 1, and the steel casing just in time can be stuck in the pickup groove 21 on anchoring section 2 tops, and the steel casing is enclosed within on the protection section 1 and steel casing lower end is stuck in the pickup groove 21;
(a6) the steel casing together is placed on the monitoring point together with fiber grating water and soil interface sensor;
(a7) hammering steel casing, making the steel casing drive fiber grating water and soil interface sensor inserts in the soil, until the major part of fiber grating water and soil interface sensor below the water and soil interface, the position of fraction more than the water and soil interface, extract the steel casing then, finish the final installation of single fiber grating water and soil interface sensor.If submerged structure is arranged near the installation site, also fixed mount can be installed in the submerged structure surface.
The method for making of above-mentioned monofilm formula sensing probe comprises following step:
(a31-1) fiber grating 313 is bonded on the pressure measurement film 3112 of ring 3,111 one sides that support or oppose;
(a32-1) optic fibre wire 314 1 ends are connected with fiber grating 313, the other end is drawn back of the body ring 3111;
(a33-1) at fiber grating 313 opposite side surface coverage one deck waterproof membranes 3113;
(a34-1) panel 3110 is docked by first nut, 3114 mutual folders with back of the body ring 3111.
In conjunction with Fig. 5, the method for making of above-mentioned dual-membrane type sensing probe comprises following step:
(a31-2) two inner membrances 3123 are welded on two respectively and are subjected to pressure shell 3120 inboard wall groove outward flanges;
(a32-2) at inner membrance 3123 and be subjected to filling silicone oil 3122 between pressure shell 3120 blind ends;
(a33-2) equi intensity cantilever 3125 narrow ends are inserted pressure transmission sheet 3124, wide end upper and lower surface is stained with bearing 3126, and the middle part upper and lower surface is posted fiber grating 313;
(a34-2) optic fibre wire 314 1 ends are connected with fiber grating 313, the other end is from the bearing 3126 of above-mentioned fiber grating 313 homonymies be subjected to draw the pressure shell 3120;
(a35-2) detecting means is installed on two identical pressure transmission parts middle parts, two identical pressure transmission parts and a sensing element pressing encapsulation form the dual-membrane type sensing probe.
Fiber grating water and soil of the present utility model interface sensor, can be according to the monitoring requirement of washing away (or alluvial) zone, the fiber grating water and soil interface monitoring system that laying is made up of a plurality of sensors, be connected to Surveillance center via transmission cable, realize that this zone washes away the remote live of (or alluvial) state and monitor automatically.
In the present embodiment, protection section 1 is connected with the welding of anchoring section 2 usefulness or bolt; Piezometric tube is installed in the fixed mount protection section 1, and the top bolt connects.
In the present embodiment, piezometric tube pipe shaft 3 is the PE plastic material; Monofilm formula sensing probe pressure measurement film 3112 is phosphor-copper film material, and waterproof membrane 3113 is macromolecule waterproofing membrane material, and back of the body ring 3111 is stainless steel ring sheet material; The dual-membrane type sensing probe is subjected to pressure shell 3120, inner membrance 3123 to be the phosphor-copper material.
The principle of work of the utility model fiber grating water and soil interface sensor is as follows:
The utility model fiber grating water and soil interface sensor mainly utilizes soil body soil lateral pressure and the positively related principle of the degree of depth under the water and soil interface and designs: the horizontal direction pressure in the soil body is made up of soil body lateral pressure and water pressure under water, and be accompanied by the increase of the degree of depth, soil body lateral pressure and water pressure be corresponding increase also, horizontal direction pressure in the water body then has only water body pressure, therefore, be merely able to the front by one and be subjected to soil body lateral pressure and effect of water pressure, the back side is subjected to the optical fiber grating sensing probe 31 of effect of water pressure, the pressure differential of measuring front and back just can access soil body lateral pressure, some such optical fiber grating sensing probes 31 are placed under water (part is imbedded in the soil) at interval by certain depth, just can simulate soil body lateral pressure with the pressure distribution curve of change in depth, finally obtaining soil body lateral pressure is zero critical depth position, is the wash surface height.
Fiber grating water and soil of the present utility model interface sensor, can be according to the monitoring requirement of washing away (or alluvial) zone, the fiber grating water and soil interface monitoring system that laying is made up of a plurality of sensors, be connected to Surveillance center via transmission cable, realize that this zone washes away the remote live of (or alluvial) state and monitor automatically.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (5)
1. fiber grating water and soil interface sensor is characterized in that: comprise fixed mount and piezometric tube; Fixed mount comprises protection section (1) and anchoring section (2), and anchoring section (2) is fixed on the bottom of protection section (1); Anchoring section (2) end face circumferentially has pickup groove (21), is used for when fiber grating water and soil interface sensor is installed fixedly steel casing, protects section (1) within pickup groove (21) scope; Piezometric tube comprises piezometric tube pipe shaft (3), the optical fiber grating sensing probe (31) that porous disc (32) is identical with several, and is provided with water filling port (33); Porous disc (32) is fixed on a side of piezometric tube pipe shaft (3), and other three sides are longitudinally arranged several identical optical fiber grating sensing probes (31) respectively, and water filling port (33) is welded on the top of piezometric tube pipe shaft (3); Piezometric tube is fixed in the protection section (1) of fixed mount.
2. fiber grating water and soil according to claim 1 interface sensor, it is characterized in that: described water filling port (33) is salable.
3. fiber grating water and soil according to claim 1 interface sensor, it is characterized in that: described optical fiber grating sensing probe (31) is monofilm formula sensing probe or dual-membrane type sensing probe.
4. fiber grating water and soil according to claim 3 interface sensor, it is characterized in that: described monofilm formula sensing probe comprises panel (3110), back of the body ring (3111), pressure measurement film (3112), waterproof membrane (3113), is scribed at fiber grating (313), first nut (3114) and second nut (3115) on the optic fibre wire (314); One end of optic fibre wire (314) links to each other with fiber grating (313), and the other end is drawn from back of the body ring (3111); Fiber grating (313) is bonded in pressure measurement film (3112) and the inboard middle part of waterproof membrane (3113); Have a circle hole on the panel (3110), circle hole area is 1/2 ~ 4/5 of panel (3110) area, back of the body ring (3111) is the metal ring plate, the interior diameter of back of the body ring (3111) is identical with circle hole interior diameter, pressure measurement film (3112) and waterproof membrane (3113) are fixed between panel (3110) and the back of the body ring (3111), panel (3110) is fixedlyed connected by first nut (3114) with back of the body ring (3111), and monofilm formula sensing probe is fixed on the piezometric tube pipe shaft (3) by second nut (3115).
5. fiber grating water and soil according to claim 3 interface sensor, it is characterized in that: described dual-membrane type sensing probe comprises two identical pressure transmission parts and a sensing element, and the pressure transmission parts comprise and are subjected to pressure shell (3120), inner membrance (3123) and silicone oil (3122); Being subjected to pressure shell (3120) is one-time formed crown cap, is subjected to the capping of pressure shell (3120) as adventitia, is subjected to pressure shell (3120) inwall side to have a circle groove near blind end, and inner membrance (3123) is welded on this groove outward flange; Silicone oil (3122) is filled in inner membrance (3123) and is subjected between pressure shell (3120) blind end; Sensing element comprises pressure transmission sheet (3124), equi intensity cantilever (3125), bearing (3126), fiber grating (313) and optic fibre wire (314); The narrow end of equi intensity cantilever (3125) inserts in the pressure transmission sheet (3124), and wide end upper and lower surface is stained with identical two bearings (3126) respectively, and the middle part upper and lower surface is stained with fiber grating (313) respectively; Optic fibre wire (314) one ends link to each other with fiber grating (313), and the other end is from the bearing (3126) of above-mentioned fiber grating (313) homonymy be subjected to draw the pressure shell (3120); Sensing element is positioned at two identical pressure transmission parts middle parts, and two identical pressure transmission parts and sensing element pressing encapsulation are formed the dual-membrane type sensing probe.
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| CN 201320030033 CN203053517U (en) | 2013-01-21 | 2013-01-21 | Fiber Bragg grating water-soil interface sensor |
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| CN 201320030033 CN203053517U (en) | 2013-01-21 | 2013-01-21 | Fiber Bragg grating water-soil interface sensor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103076063A (en) * | 2013-01-21 | 2013-05-01 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103076063A (en) * | 2013-01-21 | 2013-05-01 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
| CN103076063B (en) * | 2013-01-21 | 2014-12-17 | 南京理工大学 | Optical fiber grating water and soil interface sensor and manufacturing and installation method thereof |
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