CN105628279A - Regular-dodecahedron pressure sensor - Google Patents
Regular-dodecahedron pressure sensor Download PDFInfo
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- CN105628279A CN105628279A CN201610074376.6A CN201610074376A CN105628279A CN 105628279 A CN105628279 A CN 105628279A CN 201610074376 A CN201610074376 A CN 201610074376A CN 105628279 A CN105628279 A CN 105628279A
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- liquid metal
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- box body
- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0004—Force transducers adapted for mounting in a bore of the force receiving structure
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Abstract
The invention discloses a regular-dodecahedron pressure sensor, and the pressure sensor comprises a box body (1), and the box body (1) is a dodecahedron. The six adjacent surfaces of the box body (1) are stress surfaces (2), and each two organic polymer cylinders (3) are disposed between each stress surface (2) and a corresponding opposite surface in a clamping manner. The organic polymer cylinders (3) are respectively provided with a spiral micro-channel (5), and the interior of each spiral micro-channel (5) is filled with liquid metal. The liquid metal in the spiral micro-channels (5) achieve feed through a coaxial cable 4. The sensor measures the pressure of soil or rock through an antenna frequency receiving device, and achieves the remote monitoring and measurement of the pressure condition of the soil or rock. The pressure sensor is advantageous in that the sensor can measure six stress components at a time with no need of angle adjustment, is simple and convenient in operation, and improves the measurement precision; and the pressure sensor can monitor three-direction pressure remotely in real time, and improves the detection accuracy and reliability.
Description
Technical field
The invention belongs to Geotechnical Engineering stress test technical field, be specifically related to a kind of triaxial pressure sensor.
Background technology
In civil engineering, the three-dimensional stress test of Rock And Soil or concrete bodies is a basic work in engineering, is the basis to engineering gps network and evaluation. Especially can accurately measure three-dimensional stress state and realize real-time remote monitoring, for infrastructure projects such as civil engineering, hydraulic engineering, traffic engineering, there is basic important function.
At present, in civil engineering stress test field, existing pressure test device great majority can only test the pressure in a direction, only minority pressure test device can test three-dimensional stress state, Chinese patent literature CN102620870A, CN104075944A disclose several triaxial pressure test device, have their own characteristics each. But find after Integrated comparative, there is Railway Project in existing triaxial pressure test device: 1, existing triaxial pressure test device is mainly all based on sensor-type or type vibration wire soil pressure cell, and this class testing device precision is not high enough, is subject to electromagnetic interference, range is big not, and long-time stability are poor; 2, existing triaxial pressure test device is all wired transmission test data, and MTD is deep not, it is impossible to remote testing; 3, existing triaxial pressure test device all can not for a long time, real-time remote monitoring; 4, existing triaxial pressure test device, is obtain six components, complicated operation by two same instruments different angles, and angle is inaccurate control so that measuring accuracy is not high.
Chinese patent literature CN104037495A discloses a kind of L-type liquid metal antenna for landslide monitoring on the 10th in JIUYUE in 2014, it includes elastic shell, L-type hollow pipe, micropump and feeding coaxial lines and ground strip, liquid metal is filled inside elastic shell, L-type hollow pipe is arranged on elastic shell top side, and connect inside elastic shell, L-type hollow pipe upwardly extends, micropump is installed on L-type hollow pipe top, being internally located at liquid metal overfall from L-type hollow pipe has feeding coaxial lines to draw, and the liquid metal at overfall place electrically connects with ground strip. This patent can carry out the state change on real-time remotely monitoring landslide, but, this device there is problems in that
1), this patent can only test a directional pressure, it is impossible to test triaxial pressure;
2), owing to micropump is installed on L-type hollow pipe top, this micropump is for evacuating gas to L-type hollow pipe, to maintain L-type hollow pipe air pressure balance, because the atmospheric pressure value in L-type hollow pipe cannot detect and keep constant, cause that the liquid metal flows relevant to atmospheric pressure value is subject to micropump control, so the liquid metal length of L-type hollow pipe can not truly reflect the stress deformation of elastic shell, cause the monitoring that landslide displacement deformsMistake;
3), L-type hollow pipe be arranged on elastic shell top side, elongated L-type hollow pipe intensity is relatively low, very weak with the intensity of elastic shell junction, easily snap off in actual use and damages.
Summary of the invention
For prior art Problems existing, the technical problem to be solved is just to provideA kind of triaxial pressure sensor of regular dodecahedron, it can in real time, remotely monitor triaxial pressure, and can improve the accuracy detected, reliability.
The technical problem to be solved is realized by such technical scheme, it includes box body, box body is dodecahedron, six faces that box body is adjacent are stress surface, two organic polymer cylinders have respectively been clamped corresponding thereto between face at each stress surface, having spiral type fluid channel on organic polymer cylinder, be full of liquid metal in spiral type fluid channel, the liquid metal in spiral type fluid channel is fed by coaxial feeder.
Liquid metal in fluid channel constitutes liquid metal antenna. Liquid metal antenna on two organic polymer cylinders is concurrently accessed coaxial feeder and feeds, and forms the symmetrical dipole in antenna.
The operation principle of the present invention is: be embedded in rock mass by the present invention or after in soil, and six stress surfaces of box body start to be squeezed, the effect of being under pressure of the stress surface of box body, and produce deformation. Stress surface strains experienced passes to two compressible organic polymer cylinders, and organic polymer cylinder is compressed, and causes that the spiral type fluid channel in organic polymer cylinder produces longitudinal direction and transversely deforming. After deformation, the frequency receiving device reception is changing liquid metal after being fed by coaxial feeder.
Receiving the change of frequency thus extrapolating the soil pressure that device is subject to by receiving device, box case institute stress F is directly proportional to deflection �� L, and relational expression is as follows:
F=K �� L
In formula, K is the coefficient of elasticity of box body, �� L=l1-l2, l1For the liquid metal antenna length before pressure effect; l2For the liquid metal antenna length after pressure effect.
According to " frequency reconfigurable antenna based on liquid metal is studied and design ", Xia Linyan, Chongqing Mail and Telephones Unvi's master thesis, the 30th page, describe the frequency of liquid metal antenna and the relation of antenna length.
The frequency f of liquid metal antenna and the inversely proportional relation of the length l of liquid metal,Wherein c is the light velocity, and a is the coefficient of relationship between l and wavelength, ��pIt it is organic polymer dielectric constant.
Thus, the three-dimensional stress state of rock mass to be measured or the soil body can be recorded according to the mutual relation of f-l-�� L-F.
The present invention is when three received strength, the deformation of liquid metal spiral type fluid channel in organic polymer cylinder, make liquid metal antenna frequency change, receive device by antenna frequencies and record the pressure of the soil body or rock mass, it is achieved the remotely pressure condition of monitoring and the measurement soil body or rock mass. Owing to rock and soil pressure acts directly on organic polymer cylinder by box body panel, the liquid metal length in spiral type fluid channel is caused to change, the liquid metal flows deformation caused by pipeline air extracted out by the micropump avoiding L-type liquid metal antenna, the change of liquid metal antenna can truly reflect box body stress deformation, improves the accuracy of detection. It addition, the spiral type fluid channel being full of liquid metal is opened on the cylinder of polymeric cylinder, liquid metal antenna is attached on polymeric cylinder, and is arranged in box body, and its intensity is the intensity that box body is overall, improves the reliability of detection. Box body is dodecahedron simultaneously, once can measure the component of six different directions, easy and simple to handle,
Compared with prior art, the invention have the advantage that can six components of stress obtaining of one-shot measurement, obtain six components without adjusting angle, easy and simple to handle, and improve certainty of measurement; Can real-time remote monitoring triaxial pressure, improve the accuracy of detection, reliability.
Accompanying drawing explanation
The present invention'sAccompanying drawingIllustrate as follows:
Fig. 1Contour structures for the present invention is illustratedFigure;
Fig. 2The cylindrical structural representation of organic polymer for the present inventionFigure;
Fig. 3Contour structures signal for the Metal wire spiral column mould of the present inventionFigure;
Fig. 4Circuit theory frame for the frequency measurement of the present inventionFigure;
Fig. 5For the coordinate that the application present invention is correspondingFigure��
In figure: 1. box body; 2. stress surface; 3. organic polymer cylinder; 4. coaxial feeder; 5. spiral type fluid channel; 6. Metal wire spiral column mould; 7. organic elastomer thin film.
Detailed description of the invention
Below in conjunction withAccompanying drawingThe invention will be further described with embodiment:
Such as Fig. 1WithFig. 2Shown in, the present invention includes box body 1, box body 1 is dodecahedron, six faces that box body is adjacent are stress surface 2, two organic polymer cylinders 3 have respectively been clamped corresponding thereto between face at each stress surface 2, having spiral type fluid channel 5 on organic polymer cylinder 3, be full of liquid metal in spiral type fluid channel 5, the liquid metal in spiral type fluid channel 5 is fed by coaxial feeder 4.
Liquid metal selects the gallium-indium alloy of 3:1, tray interior filling gel. Box body stress surface is deformable steel membrane, non-stress face is indeformable steel plate.
Access coaxial feeder 4 in each spiral type fluid channel 5, pass from box body 1 summit. In this example, the coaxial feeder 4 on each organic polymer cylinder 3 box body merge into a branch of after pass from a summit. External circuit is fed to liquid liquid metal by the coaxial feeder 4 accessed, and makes the liquid metal in every pair of spiral type fluid channel 5 constitute corresponding antenna, gives off electromagnetic wave.
Such as Fig. 3Shown in, organic polymer cylinder 3 is provided with spiral type fluid channel 5. The manufacturing process of organic polymer cylinder 3 is as follows:
(1)Such as Fig. 4Shown in, prepare Metal wire spiral column mould 6, and prepare a cylindrical hollow mould;
(2) Metal wire spiral column mould is put into the hollow mould of cylinder, and Metal wire spiral column mould is close to hollow mould inwall is adhesively fixed, releasing agent is coated at Metal wire spiral column mould and hollow mould inwall, it is subsequently filled gluey organic polymer soln, after organic polymer solidifies, rotate by the hand of spiral and take out organic polymer cylinder, the cylindrical cylinder of organic polymer obtains a spiral type fluid channel groove;
(3)Such as Fig. 4Shown in, it is close to a circle organic elastomer thin film 7 on organic polymer cylinder 3 surface, makes spiral type fluid channel groove seal and form spiral type fluid channel 5;
(4) by spiral type fluid channel one end open to injecting liquid metal in fluid channel, after spiral type fluid channel fills full liquid metal, by fluid channel both ends open diaphragm seal, and perforate on the thin film of one end wherein;
(5) coaxial feeder is linked into thin film perforate;
(6) perforate is sealed.
Embodiment
Adopt the present invention to test three-dimensional stress, comprise the following steps:
Step 1, the present invention is laid in rock mass to be measured or the soil body
In rock mass to be measured or the soil body, boring is to presetting test point place, is fixed in connecting rod by the triaxial pressure sensor of the present invention, delivers to default test point; The present invention is dodecahedral shape, and six stress surfaces become 116.5 ��; Each stress surface can deform after being under pressure, thus changing the present invention?The frequency that liquid metal antenna is launched.
Step 2, measure and receive the frequency of all directions
Such as Fig. 5Shown in, swept signal source produces the sinusoidal electric signals of change frequency; The signal of telecommunication amplitude that amplitude measurement circuit records inputs automatic gain control circuit together with swept-frequency signal and compares, and is amplified through amplifying circuit by the signal after comparing; The signal of telecommunication of special frequency channel is by being converted into electromagnetic wave signal by signal transmission circuit after wave filter, it contains resonance coil and the liquid metal antenna connected by feeding coaxial lines, this special frequency channel signal of telecommunication is launched by liquid metal antenna, and receiving return signal by resonance coil, return signal and the former signal of telecommunication are overlapped; Resonance detecting circuit memory signal peak value, detects peak resonance point, in this, as interrupt signal; When electrical signal of the frequency a certain in special frequency channel is consistent with the own frequency of the liquid metal antenna deformed upon, resonance coil obtains the maximum signal of telecommunication, frequency counting circuit accurately measures frequency during the maximum signal of telecommunication passed through, and this frequency values is equal to the natural frequency value of liquid metal antenna. Amplitude measurement circuit records the amplitude of the signal of telecommunication in detecting circuit, sends automatic gain control circuit to as feedback signal;
The frequency that step 3, transmission are collected
Each class frequency value that receiver is collected by wireless transmitter is adopted to be transferred to PC end;
Step 4, data analysis
After PC termination receives frequency data, foundation more new database, and each group data of the different periods obtained are updated in test philosophy formula, thus calculating the three-dimensional stress constraint of test point.
The test philosophy derivation of equation of test point triaxiality is as follows:
Such as Fig. 5Shown in, in three dimensions, certain stress surface of the present invention is vertical with straight line OA. Then OA projection l, m, n on three change in coordinate axis direction of x, y, z is respectively as follows:
N=cos ��
Wherein �� is the angle of straight line OA and z-axis,For the angle of straight line OA projection on plane xOy Yu x-axis, here they are commonly referred to as azimuth. If known tangent stress is
Wherein, ��x����y����zRepresent direct stress, ��xy����xz����yx����yz����zx����zyRepresent shear stress and ��xy=��yx, ��xz=��zx, ��yz=��zy. So having six components of stress.
Then the direct stress in OA direction is ��n:
��n=��xl2+��ym2+��zn2+2��xylm+2��yzmn+2��zxnl
It is to say, the direct stress of any direction can obtain. If the direct stress on six different directions is ��k, then
��k=��xlk 2+��ymk 2+��znk 2+2��xylkmk+2��yzmknk+2��zxnklk
Wherein k=1,2,3,4,5,6. This formula can also be write as matrix form, namely
Just the three-dimensional stress constraint obtaining test point can be calculated by above-mentioned formula. (list of references: the operation principle of triaxiality meter and error analysis, Zhang Hong, Li Shunqun etc., civil construction and environmental project, in April, 2015)
A triaxial pressure sensor of the present invention is placed at the test point place of body to be measured, the deformation of spiral type liquid metal fluid channel in compressible cylinder in triaxial pressure sensor, the liquid metal antenna frequency making device changes, by antenna frequencies R-T unit, collect each frequency, thus indirectly recording all directions pressure of body to be measured, obtained the three-dimensional stress state of test point by formula operation, thus realizing remotely measuring and monitoring in real time.
Claims (2)
1. the triaxial pressure sensor of a regular dodecahedron, it is characterized in that: include box body (1), it is characterized in that: box body (1) is regular dodecahedron, adjacent six faces of box body (1) are stress surface (2), two organic polymer cylinders (3) have respectively been clamped corresponding thereto between face at each stress surface (2), organic polymer cylinder (3) has spiral type fluid channel (5), being full of liquid metal in spiral type fluid channel (5), the liquid metal in spiral type fluid channel (5) is by coaxial feeder (4) feed.
2. the triaxial pressure sensor of regular dodecahedron according to claim 1, is characterized in that: stress surface is steel membrane, and non-stress face is steel plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610074376.6A CN105628279B (en) | 2016-02-02 | 2016-02-02 | A kind of triaxial pressure sensor of regular dodecahedron |
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| CN201610074376.6A CN105628279B (en) | 2016-02-02 | 2016-02-02 | A kind of triaxial pressure sensor of regular dodecahedron |
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| CN105628279A true CN105628279A (en) | 2016-06-01 |
| CN105628279B CN105628279B (en) | 2018-08-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107063311A (en) * | 2017-04-21 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of dynamic measurement system method of single coil vibrating sensor |
| CN112902860A (en) * | 2021-01-22 | 2021-06-04 | 重庆大学 | Device based on FBG test rock mass three-dimensional stress |
| CN113551822A (en) * | 2021-07-30 | 2021-10-26 | 广西路桥工程集团有限公司 | Steel pipe concrete hoop effect testing arrangement based on hydraulic pressure |
| CN113758614A (en) * | 2021-08-26 | 2021-12-07 | 重庆大学 | Liquid metal pressure sensor and pressure value calibration method thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107063311A (en) * | 2017-04-21 | 2017-08-18 | 江西飞尚科技有限公司 | A kind of dynamic measurement system method of single coil vibrating sensor |
| CN112902860A (en) * | 2021-01-22 | 2021-06-04 | 重庆大学 | Device based on FBG test rock mass three-dimensional stress |
| CN113551822A (en) * | 2021-07-30 | 2021-10-26 | 广西路桥工程集团有限公司 | Steel pipe concrete hoop effect testing arrangement based on hydraulic pressure |
| CN113551822B (en) * | 2021-07-30 | 2023-01-31 | 广西路桥工程集团有限公司 | Steel pipe concrete hoop effect testing arrangement based on hydraulic pressure |
| CN113758614A (en) * | 2021-08-26 | 2021-12-07 | 重庆大学 | Liquid metal pressure sensor and pressure value calibration method thereof |
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| CN105628279B (en) | 2018-08-03 |
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