CN210513509U - Fiber grating pore water pressure sensor - Google Patents
Fiber grating pore water pressure sensor Download PDFInfo
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- CN210513509U CN210513509U CN201921685164.7U CN201921685164U CN210513509U CN 210513509 U CN210513509 U CN 210513509U CN 201921685164 U CN201921685164 U CN 201921685164U CN 210513509 U CN210513509 U CN 210513509U
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- elastic membrane
- fiber grating
- pressure
- water pressure
- permeable stone
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Abstract
The utility model provides a fiber grating pore water pressure sensor, including the sensor protective housing, with outside soil body in close contact with's permeable stone filter equipment and fiber grating sensor measuring device, permeable stone filter equipment and fiber grating sensor measuring device set up respectively within the sensor protective housing, fiber grating sensor measuring device is including meeting an emergency fiber grating sensor element and elastic membrane, the fiber grating sensor element that meets an emergency inlays admittedly within the elastic membrane, permeable stone filter equipment sets up elastic membrane's upper portion, be equipped with the hydraulic pressure chamber between permeable stone filter equipment, the elastic membrane, be full of the pressure water that passes in the hydraulic pressure chamber. The utility model has the advantages that: the real value of the pore water pressure can be measured efficiently and quickly.
Description
Technical Field
The utility model relates to a sensor especially relates to a fiber grating pore water pressure sensor.
Background
In recent years, the research and application of fiber grating sensors have attracted much attention, and compared with the traditional sensing measurement technology, the fiber grating sensing technology has many obvious advantages. For example, the fiber grating has the characteristics of flexible structural form, high temperature resistance, corrosion resistance, strong anti-electromagnetic interference capability, small volume, light weight and the like, and is widely applied to measurement of various physical quantities such as pressure, deformation, displacement, flow, volume, flow rate and the like.
At present, the design and processing method of the fiber bragg grating pore water pressure sensor is relatively lagged behind, and the measurement precision, response time, measurement error and the like of the pore water pressure cannot meet the monitoring requirements of water conservancy and civil engineering. Because the bare fiber grating sensing unit is very fine and has extremely small stress and temperature sensitivity coefficient, the bare fiber grating sensing unit cannot be directly used for measuring actual physical quantities such as water pressure, temperature, pressure and the like, the fiber grating sensing unit needs to be designed and packaged according to the measuring environment and the measured physical quantities, and the fiber grating pore water pressure sensor capable of meeting the measuring requirements is processed. Meanwhile, the existing fiber grating pore water pressure sensor has preliminary research results, but the test effect of the existing fiber grating sensor for measuring water pressure is required to be improved, and the existing fiber grating sensor for measuring water pressure is not ideal in the aspects of measuring water pressure accuracy, precision, lag time and the like. Therefore, there is a need to develop a fiber bragg grating pore water pressure sensor which can measure the true value of the pore water pressure efficiently and quickly.
Disclosure of Invention
In order to solve the problems in the prior art, the utility model provides a fiber grating pore water pressure sensor.
The utility model provides a fiber grating pore water pressure sensor, which comprises a sensor protective shell, a permeable stone filtering device and a fiber grating sensor measuring device, wherein the permeable stone filtering device and the fiber grating sensor measuring device are respectively arranged in the sensor protective shell, the fiber grating sensor measuring device comprises a strain fiber grating sensor element and an elastic membrane, the strain fiber grating sensor element is embedded and fixed in the elastic membrane, the permeable stone filtering device is arranged on the upper part of the elastic membrane, a hydraulic cavity is arranged between the permeable stone filtering device and the elastic membrane, the hydraulic cavity is filled with pressure transfer water, the water in the soil sample transfers the water pressure in the soil sample to the pressure transfer water in the hydraulic cavity through the permeable stone filtering device and further transfers the water pressure to the surface of the elastic membrane on the lower part of the hydraulic cavity, when the pressure on the elastic membrane changes, the elastic membrane deforms, the strain fiber grating sensor element inside the elastic membrane deforms along with the elastic membrane and generates strain, and the pressure on the elastic membrane is obtained through strain measurement of the strain fiber grating sensor element, namely the pore water pressure in the hydraulic cavity.
As a further improvement, the below of elastic membrane is equipped with the cavity, works as when the pressure transmission water pressure in the hydraulic pressure chamber increases, pressure increases on the elastic membrane, and the cavity production of elastic membrane below corresponds and warp, can obtain the increase value of pore water pressure through the measurement of straining fiber grating sensor element.
As a further improvement of the utility model, the permeable stone filtering device, the hydraulic pressure chamber, the elastic membrane and the cavity are circular and have the same diameter.
As a further improvement of the present invention, the strain fiber grating sensor element is located in the center of the elastic membrane.
As a further improvement, the permeable stone filtering device comprises a permeable stone, the permeable stone is a porous medium for separating soil particles in the soil sample to be measured from water in the soil particles.
The utility model has the advantages that: through the scheme, the true value of the pore water pressure can be measured efficiently and quickly.
Drawings
Fig. 1 is a schematic view of the main viewing direction of the fiber grating pore water pressure sensor of the present invention.
Fig. 2 is a schematic view of the overlooking direction of the fiber grating pore water pressure sensor of the present invention.
Detailed Description
The present invention will be further described with reference to the following description and embodiments.
As shown in fig. 1 to 2, a fiber bragg grating pore water pressure sensor comprises a sensor protection shell 108, a permeable stone filtering device 101 and a fiber bragg grating sensor measuring device, wherein the permeable stone filtering device 101 and the fiber bragg grating sensor measuring device are in close contact with an external soil body, the permeable stone filtering device 101 and the fiber bragg grating sensor measuring device are respectively arranged in the sensor protection shell 108, the fiber bragg grating sensor measuring device comprises a strain fiber bragg grating sensor element 105 and an elastic membrane 104, the strain fiber bragg grating sensor element 105 is embedded and fixed in the elastic membrane 104, the permeable stone filtering device 101 is arranged on the upper portion of the elastic membrane 104, a hydraulic cavity 102 is arranged between the permeable stone filtering device 101 and the elastic membrane 104, the hydraulic cavity 102 is filled with pressure transfer water 103, water in a soil sample transfers water pressure in the soil sample to the pressure transfer water 103 in the hydraulic cavity 102 through the permeable stone filtering device 101, and further transmitted to the surface of the elastic membrane 104 at the lower part of the hydraulic pressure chamber 102, when the pressure on the elastic membrane 104 changes, the elastic membrane 104 deforms, the strain fiber grating sensor element 105 inside the elastic membrane 104 deforms and generates strain, and the pressure on the elastic membrane 104, namely the pore water pressure in the hydraulic pressure chamber 102, is obtained by measuring the strain of the strain fiber grating sensor element 105.
As shown in fig. 1 to fig. 2, a cavity 107 is disposed below the elastic membrane 104, when the pressure of the pressure-transmitting water 103 in the hydraulic chamber 102 increases, the pressure on the elastic membrane 104 increases, and the cavity 107 below the elastic membrane 104 deforms correspondingly, so that the increased value of the pore water pressure can be obtained through measurement of the strain fiber grating sensor element 105.
As shown in fig. 1 to 2, the permeable stone filtering device 101, the hydraulic pressure chamber 102, the elastic membrane 104 and the cavity 107 are all circular and have the same diameter.
As shown in fig. 1 to 2, the strain fiber grating sensor element 105 is located at the center of the elastic membrane 104.
As shown in fig. 1 to 2, the permeable stone filtering device 101 includes a permeable stone which is a porous medium separating soil particles in a measured soil sample from water in the soil particles.
As shown in fig. 1 to 2, a sensor lower base 109 is connected to the bottom of a sensor protection shell 108, the sensor protection shell 108 and the sensor lower base 109 enclose to form a circular groove, a porous stone filtering device 101, a hydraulic pressure cavity 102, an elastic membrane 104 and a cavity 107 are stacked in the circular groove from top to bottom, a strain fiber grating sensor element 105 is connected to the boundary through a sensor signal fiber 106, and the sensor signal fiber 106 is protected through a sleeve 110 and a fiber protection sleeve 111.
The utility model provides a pair of fiber grating pore water pressure sensor, the water permeable stone can be separated the soil granule in the soil sample of surveying for porous medium and the moisture in the soil granule, and the soil granule is kept off in the water permeable stone outside, water in the soil sample passes through the water permeable stone and transmits the water pressure in the soil sample to the liquid in hydraulic pressure chamber 102 to further transmit elastic membrane 104 surface to hydraulic pressure chamber 102 lower part. The elastic membrane 104 is embedded with a strain fiber grating sensor element 105, when the pressure on the elastic membrane 104 changes, the elastic membrane 104 deforms, the strain fiber grating sensor element 105 inside the elastic membrane 104 deforms and generates strain, and the pressure on the elastic membrane 104, namely the pore water pressure in the hydraulic cavity 102, can be obtained by measuring the strain of the strain fiber grating sensor element 105. The cavity 107 is arranged below the elastic membrane 104, so when the pressure of the pressure-transmitting water in the hydraulic pressure chamber 102 is increased, the pressure on the elastic membrane 104 is increased, the corresponding deformation is generated on the cavity 107 below the elastic membrane 104, and the increased value of the pore water pressure can be obtained through the measurement of the strain fiber grating sensor element 105.
The utility model provides a fiber grating pore water pressure sensor, which can realize the pore water pressure measuring function in the soil sample through the permeable stone filtering device 101 and the fiber grating sensor measuring device; the permeable stone is a porous medium, so that soil particles in the soil sample to be measured can be separated from water in the soil particles, the water in the soil sample transmits the water pressure in the soil sample to the liquid in the hydraulic cavity 102 through the permeable stone and further transmits the water pressure to the surface of the elastic membrane 104 at the lower part of the hydraulic cavity 102, the pressure on the elastic membrane 104 can be obtained through strain measurement of the strain fiber grating sensor element 105, and the true value of the pore water pressure can be measured efficiently and quickly.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (5)
1. A fiber grating pore water pressure sensor is characterized in that: the device comprises a sensor protective shell, a permeable stone filtering device and a fiber bragg grating sensor measuring device, wherein the permeable stone filtering device and the fiber bragg grating sensor measuring device are in close contact with an external soil body and are respectively arranged in the sensor protective shell, the fiber bragg grating sensor measuring device comprises a strain fiber bragg grating sensor element and an elastic membrane, the strain fiber bragg grating sensor element is embedded and fixed in the elastic membrane, the permeable stone filtering device is arranged at the upper part of the elastic membrane, a hydraulic cavity is arranged between the permeable stone filtering device and the elastic membrane, the hydraulic cavity is filled with pressure transfer water, the water in a soil sample transfers the water pressure in the soil sample to the pressure transfer water in the hydraulic cavity through the permeable stone filtering device and further transfers the water pressure to the surface of the elastic membrane at the lower part of the hydraulic cavity, and when the pressure on the elastic membrane changes, the elastic membrane deforms, the strain fiber grating sensor element inside the strain fiber grating sensor element deforms along with the elastic membrane and generates strain, and the pressure on the elastic membrane is obtained through strain measurement of the strain fiber grating sensor element, namely the pore water pressure in the hydraulic cavity.
2. The fiber grating pore water pressure sensor of claim 1, wherein: and a cavity is arranged below the elastic membrane, when the pressure of pressure-transmitting water in the hydraulic cavity is increased, the pressure on the elastic membrane is increased, the cavity below the elastic membrane generates corresponding deformation, and the increased value of the pore water pressure can be obtained through the measurement of the strain fiber grating sensor element.
3. The fiber grating pore water pressure sensor of claim 2, wherein: the permeable stone filtering device, the hydraulic cavity, the elastic membrane and the cavity are all circular and have the same diameter.
4. The fiber grating pore water pressure sensor of claim 3, wherein: the strain fiber grating sensor element is positioned at the center of the circle of the elastic membrane.
5. The fiber grating pore water pressure sensor of claim 1, wherein: the permeable stone filtering device comprises a permeable stone which is a porous medium separating soil particles in a tested soil sample from water in the soil particles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921685164.7U CN210513509U (en) | 2019-10-10 | 2019-10-10 | Fiber grating pore water pressure sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921685164.7U CN210513509U (en) | 2019-10-10 | 2019-10-10 | Fiber grating pore water pressure sensor |
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| CN210513509U true CN210513509U (en) | 2020-05-12 |
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| CN201921685164.7U Active CN210513509U (en) | 2019-10-10 | 2019-10-10 | Fiber grating pore water pressure sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542510A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating pore water pressure sensor |
| CN111855529A (en) * | 2020-07-30 | 2020-10-30 | 中电建南方建设投资有限公司 | Soil body monitoring system and method |
-
2019
- 2019-10-10 CN CN201921685164.7U patent/CN210513509U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110542510A (en) * | 2019-10-10 | 2019-12-06 | 深圳市基础工程有限公司 | Fiber grating pore water pressure sensor |
| CN111855529A (en) * | 2020-07-30 | 2020-10-30 | 中电建南方建设投资有限公司 | Soil body monitoring system and method |
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