CN110579306A - Vibrating wire type pressure sensor - Google Patents
Vibrating wire type pressure sensor Download PDFInfo
- Publication number
- CN110579306A CN110579306A CN201910874242.6A CN201910874242A CN110579306A CN 110579306 A CN110579306 A CN 110579306A CN 201910874242 A CN201910874242 A CN 201910874242A CN 110579306 A CN110579306 A CN 110579306A
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- piston
- membrane
- cylinder body
- piston cylinder
- vibrating wire
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- 239000012528 membrane Substances 0.000 claims abstract description 94
- 230000005540 biological transmission Effects 0.000 claims abstract description 53
- 238000007789 sealing Methods 0.000 claims description 23
- 229910000831 Steel Inorganic materials 0.000 claims description 16
- 239000010959 steel Substances 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 4
- 239000003921 oil Substances 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 4
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 239000007788 liquid Substances 0.000 abstract description 7
- 238000009530 blood pressure measurement Methods 0.000 abstract description 3
- 239000002689 soil Substances 0.000 abstract description 3
- 238000012546 transfer Methods 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000006698 induction Effects 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/10—Measuring force or stress, in general by measuring variations of frequency of stressed vibrating elements, e.g. of stressed strings
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L7/00—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements
- G01L7/02—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges
- G01L7/08—Measuring the steady or quasi-steady pressure of a fluid or a fluent solid material by mechanical or fluid pressure-sensitive elements in the form of elastically-deformable gauges of the flexible-diaphragm type
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
the invention provides a vibrating wire type pressure sensor. The pressure sensor comprises a shell, a stress membrane, a force transmission piston, a piston cylinder body, a vibrating wire clamping device, a magnetic coil and a force transmission piston, wherein the stress membrane is a circular membrane, the center part of one side of the stress membrane is provided with the force transmission rod, the center part of the other side of the stress membrane is provided with a convex block, the outer part of the stress membrane is provided with a stress membrane shell with the same shape as the shell, and two ends of the stress membrane shell are respectively connected with the shell and the piston cylinder body; a hydraulic cavity communicated with the piston cylinder body is arranged in the force transmission piston on one side of the force bearing membrane dowel bar, the free end of the dowel bar penetrates through the bottom of the piston cylinder and the piston cavity to be directly connected with the force transmission piston, a cavity opening of the hydraulic cavity is formed in the outer end face of the force transmission piston, and a flexible contact membrane contacted with a measured object is hermetically arranged at the cavity opening of the hydraulic cavity; the vibrating wire is fixed on the bump. The invention improves the pressure measurement precision, has stable and reliable performance, and is suitable for measuring the liquid pressure, the internal force of concrete and rock-soil bodies and the interface contact pressure.
Description
Technical Field
The invention belongs to the technical field of civil engineering detection, relates to a rock-soil pressure detection instrument, and particularly relates to a vibrating wire type pressure sensor.
Background
The vibrating wire sensor has the advantages of high accuracy, reliable performance, long service life, convenient data acquisition, simple manufacture, low cost and the like, and is widely applied to geotechnical engineering. The vibrating wire type sensor mainly comprises a strain gauge, a displacement meter, an osmometer, a steel bar meter, a pressure cell, an earth pressure meter and the like, and the sensors acquire strain of a wire by acquiring the frequency of a vibrating wire and obtain the displacement, deformation and pressure of a measured object through conversion. The main components of the vibrating wire type pressure sensor are vibrating wire, deformation membrane, soft iron, exciter composed of magnet and coil, etc. The deformation membrane is a thin metal circular plate fixedly supported at the periphery, the vibrating wire is a steel wire, one end of the vibrating wire is fixed at one side of the signal wire, and the other end of the vibrating wire is connected to the deformation membrane. The middle of the string is provided with a soft iron which is placed in the magnetic field of the exciter consisting of the magnet and the coil. The deformation die deforms under the action of uniformly distributed pressure and central concentrated force to drive the steel string to deform, the natural frequency of the string correspondingly changes, at the moment, pulse current is transmitted to the magnetic induction coil, the steel string departs from the balance position device under the action of magnetic force of the magnetic induction coil to start vibrating, and the vibration frequency of the steel string is obtained through the magnetic induction coil.
The vibrating string type pressure sensor mainly comprises the following parts, firstly, liquid is directly introduced to one side of a deformation membrane, the deformation membrane deforms under the action of liquid pressure, the side wall of a deformation membrane cavity deforms under the action of the liquid pressure in the mode, the deformation uniformity of the deformation membrane is influenced, the measuring range is small, and the vibrating string type pressure sensor is suitable for measuring the liquid pressure, such as an osmometer; secondly, the piston and the liquid are transmitted to the deformation membrane for multiple times, and the pressure is transmitted to the deformation membrane for multiple times in the mode, so that the range is wide, but the pressure is lost, and the defects of the first mode exist; thirdly, the force transfer pad is used for applying the pressure of the measured object to the middle part of the deformable membrane, in this way, the force transfer pad directly acts on the middle part of the force transfer membrane, the connecting end of the force transfer pad and the deformable membrane is a plane, the contact area is gradually reduced along with the increase of the pressure, the contact area is a hemisphere, the contact area is gradually increased along with the increase of the pressure, and vice versa, the force and the deformation of the deformable membrane are uneven, and the force and the deformation of the deformable membrane are suitable for measuring; fourthly, the steel plate acting on the shell through pressure deforms to drive the base of the vibrating string fixed on the steel plate to displace, so that the length of the steel string changes, the force is transferred by adopting a steel plate deformation mode to cause certain loss of pressure, and the measured pressure is the average acting force on the surface of the steel plate, such as an earth pressure gauge (box) and an anchor cable dynamometer.
Disclosure of Invention
the invention provides a vibrating wire type pressure sensor according to the defects of the prior art, the pressure sensor is characterized in that a dowel bar and a deformation membrane are integrated, the diameter of the dowel bar is smaller than that of the deformation membrane, the pressure of a measuring point is kept unchanged and is transmitted to the deformation membrane, the adverse effect of repeated force transmission and hydraulic pressure on deformation of the deformation membrane can be solved, and the pressure measurement precision is improved.
In order to solve the technical problems, the invention provides the following technical scheme: the vibrating string type pressure sensor comprises a shell, a stress membrane arranged at one end of the shell, a force transmission piston and a piston cylinder body which are arranged on one side of the stress membrane body, a vibrating string clamping device and a magnetic coil are arranged in the shell, and a sealing cover and a cable joint are arranged at the other end of the shell, and is characterized in that: the stress membrane is a circular membrane, a stress membrane shell with the same shape as the shell is arranged outside the stress membrane, a convex block is arranged at the central part of one side of the stress membrane, a dowel bar is arranged at the central part of the other side of the stress membrane, one side of the stress membrane shell is connected with the shell, and the other side of the stress membrane shell is connected with the piston cylinder; a hydraulic cavity communicated with the piston cylinder body is arranged in the force transmission piston, a cavity opening of the hydraulic cavity of the force transmission piston is formed in the outer end face of the force transmission piston, and a flexible contact film in contact with a measured object is arranged on the cavity opening in a sealing mode; the free end of the force transmission rod penetrates through the bottom of the piston cylinder body and extends into the piston cylinder body to be directly connected with the force transmission piston; the connecting end of the vibrating wire and the stressed membrane is fixed on the bump through a vibrating wire clamping device.
The further technical scheme of the invention is as follows: the stress membrane, the stress membrane shell, the lug and the dowel bar are of an integrated structure and are all made of steel materials.
The invention has the following excellent technical scheme: the shell, the piston cylinder body and the stressed membrane shell are all cylindrical structures with the same diameter, are directly connected with one another through screw threads, and contact surfaces are sealed by sealing and sealant.
The invention has the following excellent technical scheme: the dowel bar is a cylindrical dowel bar, and the diameter of the dowel bar is 1/5-1/2 of the diameter of the dowel film.
The invention has the following excellent technical scheme: the power transmission piston is embedded into the piston cylinder body, a limiting structure is arranged between the power transmission piston outer wall and the piston cylinder body inner wall, the power transmission piston specifically comprises a limiting groove formed in the piston cylinder body inner wall and a limiting convex block correspondingly arranged on the power transmission piston outer wall, a first sealing ring is arranged between the power transmission piston and the piston cylinder body, the sealing structure is arranged at a cylinder opening close to the piston cylinder body, the first sealing ring is arranged at a position close to the piston end face at the rear of the limiting structure, hydraulic oil is filled in the piston cylinder body and a hydraulic cavity of the power transmission piston, and an oil through hole communicated with the piston cylinder body is formed in the bottom of the piston.
The invention has the following excellent technical scheme: the center of the end surface of the piston cylinder body, which is close to the stressed membrane, is provided with a dowel bar through hole, the dowel bar enters the inner cavity of the cylinder body from the dowel bar through hole, the center of the bottom surface of the dowel piston is connected with the dowel piston, and a second sealing ring is arranged at the position of the dowel bar, which penetrates through the piston cylinder body.
The invention has the following excellent technical scheme: the flexible contact film is a rubber bearing film, is fixed at the opening of the hydraulic cavity of the force transmission piston through a pressure ring and a sealant, and wraps the isolation sleeve on the side wall of the force transmission piston, which is exposed out of the piston cylinder body.
The magnetic coil comprises an exciting coil and a receiving coil, the vibrating wire is a steel wire, and the first sealing ring and the second sealing ring are O-shaped sealing rings. The stress membrane is a thin-wall round steel membrane, is positioned in a hollow cylindrical shell, the central part of one side of the membrane is provided with a cylindrical convex block smaller than the radius of the deformation membrane, the middle part of one side of the membrane is provided with a force transfer rod with the diameter of 1/3 deformation membrane, the materials of the stress membrane, the cylindrical shell, the convex block and the force transfer rod are the same, the stress membrane, the cylindrical shell, the convex block and the force transfer rod are integrally processed and formed, the end part of the force transfer rod of the stress membrane is connected with a force transfer piston, an O-shaped ring seal is arranged between the piston and a cylinder body, a flexible contact membrane at the exposed end of the force transfer piston is contacted with a measured object, the exposed side wall of the force transfer piston is isolated from other objects.
The invention sets the dowel bar and the deformation membrane into an integral structure, transmits the pressure of a measuring point to the deformation membrane under the action of the flexible contact membrane, the piston cylinder and hydraulic pressure in the hydraulic cavity, overcomes the pressure loss caused by the repeated force transmission of the traditional sensor and the adverse effect of the deformation membrane caused by the action of the hydraulic pressure on the side wall shell of the deformation membrane, improves the pressure measurement precision, has stable and reliable performance, and is suitable for measuring the liquid pressure, the internal force of concrete and rock soil and the interface contact pressure.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural diagram of the stressed membrane of the present invention;
FIG. 3 is a left side view of FIG. 2;
FIG. 4 is a side view of the piston cylinder of the present invention;
FIG. 5 is a right side view of FIG. 4;
FIG. 6 is a schematic end view of the force transfer piston and piston cylinder of the present invention;
FIG. 7 is a schematic view of the flexible contact membrane end of the force-transmitting piston of the present invention
In the figure: the device comprises a shell, 1-1 sealing cover, 2 vibrating wire, 3 magnetic coil, 4 stressed membrane, 5 stressed membrane shell, 6 lug, 7 force transmission piston, 8 cable joint, 9 piston cylinder, 9-1 dowel bar perforation, 10 hydraulic cavity, 10-1 oil through hole, 11 flexible contact membrane, 11-1 press ring, 12 dowel bar, 13 first sealing ring, 14 limiting structure, 14-1 limiting groove, 14-2 limiting lug, 15 second sealing ring, 16 vibrating wire clamping device and 17 isolating sleeve.
Detailed Description
The invention is further illustrated below with reference to examples and figures. The following detailed description of the embodiments of the present invention, presented in fig. 1-6, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the following description of the embodiments, it is to be understood that the terms "upper", "lower", "inner", "outer", "left", "right", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or the orientations or positional relationships that the product conventionally places when in use, or the orientations or positional relationships that the skilled person conventionally understands, are only for convenience in describing and simplifying the invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the invention.
It is also to be understood that, unless expressly stated or limited otherwise, the terms "disposed," "connected," and the like are intended to be open-ended, and mean "connected," i.e., fixedly connected, detachably connected, or integrally connected; may be a mechanical connection; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
An embodiment provides a vibrating wire type pressure sensor, as shown in fig. 1, which includes a cylindrical housing 1 and a stressed membrane 4 disposed at one end of the housing 1, a vibrating wire 2, a vibrating wire clamping device 16 and a magnetic coil 3 are disposed in the housing 1, the vibrating wire clamping device 16 includes two vibrating wire clamps, the vibrating wire 2 is a rigid wire, the magnetic coil 3 includes an exciting coil and a receiving coil, a permanent magnet is disposed in the coil, the vibrating wire 2 is disposed above the magnetic coil 3, and a sealing cover 1-1 and a cable joint 8 are disposed at the other end of the housing 1. The method is characterized in that: as shown in fig. 1 to 7, the vibrating wire pressure sensor further includes a force transmission piston 7 and a piston cylinder 9, the force transmission piston 7 is embedded in the piston cylinder 9 and is limited by 4 limiting structures 14, each limiting structure specifically includes a limiting groove 14-1 formed in the inner wall of the piston cylinder 9 and a limiting projection 14-2 correspondingly formed in the outer wall of the force transmission piston 7, the length of the limiting groove 14-1 is 1.5cm, and the limiting structure limits the force transmission piston 7 to prevent the force transmission piston from being separated from the piston cylinder 9. A first sealing ring 13 is arranged between the force transmission piston 7 and the piston cylinder 9, the sealing structure 14 is arranged at a cylinder opening close to the piston cylinder 9, the first sealing ring 13 is arranged at a position close to the end surface of the piston behind the limiting structure 14, a hydraulic cavity 10 communicated with the piston cylinder 9 is arranged in the force transmission piston 7, and two oil through holes 10-1 communicated with each other are arranged between the piston cylinder 9 and the hydraulic cavity 10 in the force transmission piston 7. The force transmission piston and the piston cylinder 9 are filled with hydraulic oil. The hydraulic cavity 10 of the transmission piston 7 is provided with a cavity opening on the outer end surface of the transmission piston 7, and the cavity opening is sealed with a flexible contact film 11 contacting with the object to be measured. The flexible contact film 11 is a bearing rubber film and is fixed at the orifice of the hydraulic cavity 10 of the force transmission piston 7, the contact surface of the flexible contact film and the orifice of the hydraulic cavity 10 is coated with sealant and is fixedly pressed on the orifice of the hydraulic cavity 10 through a pressing ring 11-1 and a bolt, and the side wall of the force transmission piston 7, which is exposed out of the piston cylinder body 9, is wrapped by an isolation sleeve 16.
In the embodiment of the vibrating wire type pressure sensor, as shown in fig. 2 and 3, the stressed membrane 4 is a circular membrane, the outer part of the stressed membrane 4 is provided with a stressed membrane shell 5 which has the same shape as the shell 1, the central part of one side of the stressed membrane 4 is provided with a cylindrical projection 6 with the diameter smaller than the radius of the stressed membrane 4, and the central part of the other side of the stressed membrane 4 is provided with a cylindrical dowel bar with the diameter equal to 1/3 of the stressed membrane 4; one vibrating wire clamp of the vibrating wire clamping device 16 is arranged on the cylindrical bump 6, one end of the vibrating wire 2 is arranged in the vibrating wire clamp on the cylindrical bump 6 and locked through a bolt, the other vibrating wire clamp of the vibrating wire clamping device 16 is arranged at one end, close to the sealing cover 1-1, in the shell 1 through a supporting block, the height of the other vibrating wire clamp is consistent with that of the cylindrical bump 6, and the vibrating wire 2 is guaranteed to be parallel to the inner wall of the shell. The stress membrane 4, the stress membrane shell 5, the convex block 6 and the dowel bar 12 are of an integrated structure and are all made of steel materials, and screw threads are arranged at two ends of the stress membrane shell 5 and are respectively connected with the shell 1 and the piston cylinder 9. As shown in fig. 2 and fig. 3, a dowel bar through hole 9-1 is arranged at the central position of the end surface of the piston cylinder 9 close to the stressed membrane 4, the free end of the dowel bar 12 enters the inner cavity of the cylinder from the dowel bar through hole 9-1 and is fixedly connected with the central position of the force transmission piston 7, and a second sealing ring 15 is arranged at the position where the dowel bar 12 passes through the piston cylinder 9.
When the pressure sensor works, the pressure sensor is embedded at a position to be measured like the use method of the existing pressure sensor, under the action of a measured object, the pressure of a measuring point is transmitted to the stress membrane 4 by the force transmission rod 12 under the hydraulic action of the flexible contact membrane 11, the force transmission piston 7 and the piston cylinder 9, the stress membrane 4 deforms, and the vibrating wire 2 is driven to deform, so that the frequency of the vibrating wire before and after deformation can be measured, and the frequency of the vibrating wire is A (F) according to the formula F2-f0 2) Calculating the pressure of a measuring point, wherein f is the string frequency; f. of0The initial frequency of the steel string, A, B, is the sensor constant, and is found by fitting calibration data.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
the above description is only one embodiment of the present invention, and the description is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (6)
1. the utility model provides a vibrating wire formula pressure sensor, includes casing (1), sets up atress membrane (4) in casing (1) one end, passes power piston (7) and piston cylinder body (9) in atress membrane body one side, is equipped with vibrating wire (2), vibrating wire clamping device (16) and magnetic coil (3) in casing (1), is equipped with sealed lid (1-1) and cable joint (8) at the other end of casing (1), its characterized in that: the stress membrane (4) is a circular membrane, a stress membrane shell (5) with the same shape as the shell (1) is arranged outside the stress membrane, a convex block (6) is arranged at the central part of one side of the stress membrane (4), a dowel bar (12) is arranged at the central part of the other side of the stress membrane, one side of the stress membrane shell (5) is connected with the shell (1), and the other side of the stress membrane shell is connected with the piston cylinder body (9); a hydraulic cavity (10) communicated with the piston cylinder body (9) is arranged in the force transmission piston (7), the opening of the hydraulic cavity (10) of the force transmission piston (7) is arranged on the outer end face of the force transmission piston (7), and a flexible contact film (11) contacted with a measured object is hermetically arranged on the opening of the hydraulic cavity; the free end of the force transmission rod (12) penetrates through the bottom of the piston cylinder body and extends into the piston cylinder body (9) to be directly connected with the force transmission piston (7); the connection end of the vibrating wire (2) and the stressed membrane (4) is fixed on the bump (6) through a vibrating wire clamping device (16).
2. A vibrating wire pressure transducer according to claim 1, wherein: the stress membrane (4), the stress membrane shell (5), the lug (6) and the dowel bar (12) are of an integrated structure and are all made of steel materials.
3. A vibrating wire pressure transducer according to claim 1, wherein: the shell (1), the piston cylinder body (9) and the stressed membrane shell (5) are all cylindrical structures with the same outer diameter and are directly connected with each other through screw threads.
4. A vibrating wire pressure transducer according to claim 1, 2 or 3, wherein: the power transmission piston (7) is embedded into a piston cylinder body (9), a limiting structure (14) is arranged between the outer wall of the power transmission piston (7) and the inner wall of the piston cylinder body (9), the power transmission piston specifically comprises a limiting groove (14-1) formed in the inner wall of the piston cylinder body (9) and a limiting bump (14-2) correspondingly arranged on the outer wall of the power transmission piston (7), a first sealing ring (13) is arranged between the power transmission piston (7) and the piston cylinder body (9), the sealing structure (14) is arranged at a cylinder opening close to the piston cylinder body (9), the first sealing ring (13) is arranged at a position close to the end face of the piston behind the limiting structure (14), hydraulic oil is filled in hydraulic cavities of the piston cylinder body (9) and the power transmission piston (7), and an oil through hole (10-1) communicated with the piston cylinder body (9) is formed in the bottom of the.
5. A vibrating wire pressure transducer according to claim 1, 2 or 3, wherein: a dowel bar through hole (9-1) is formed in the central position of the end face, close to the stressed membrane (4), of the piston cylinder body (9), a dowel bar (12) enters the inner cavity of the cylinder body from the dowel bar through hole (9-1) and is connected with the central position of the force transmission piston (7), and a second sealing ring (15) is arranged at the position, penetrating through the piston cylinder body (9), of the dowel bar (12).
6. A vibrating wire pressure transducer according to claim 1, 2 or 3, wherein: the flexible contact film (11) is a rubber bearing film, is fixed at the orifice of the hydraulic cavity (10) of the force transmission piston (7) through a pressure ring (11-1) and a sealant, and the side wall of the force transmission piston (7) exposed out of the piston cylinder body (9) is wrapped by an isolation sleeve (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874242.6A CN110579306A (en) | 2019-09-17 | 2019-09-17 | Vibrating wire type pressure sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910874242.6A CN110579306A (en) | 2019-09-17 | 2019-09-17 | Vibrating wire type pressure sensor |
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| CN110579306A true CN110579306A (en) | 2019-12-17 |
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|---|---|---|---|
| CN201910874242.6A Pending CN110579306A (en) | 2019-09-17 | 2019-09-17 | Vibrating wire type pressure sensor |
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| CN (1) | CN110579306A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112798045A (en) * | 2020-12-31 | 2021-05-14 | 重庆广播电视大学(重庆工商职业学院) | Tunnel construction detection system |
| CN114563113A (en) * | 2022-03-03 | 2022-05-31 | 中国工程物理研究院总体工程研究所 | Hollow resonant stress assembly and stress meter |
| CN115979918A (en) * | 2023-01-28 | 2023-04-18 | 中国科学院武汉岩土力学研究所 | Vibrating wire osmometer suitable for being used in cold environment and use method |
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