CN216668702U - Liquid pressure sensing inclinometer based on grating fiber - Google Patents
Liquid pressure sensing inclinometer based on grating fiber Download PDFInfo
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- CN216668702U CN216668702U CN202220266344.7U CN202220266344U CN216668702U CN 216668702 U CN216668702 U CN 216668702U CN 202220266344 U CN202220266344 U CN 202220266344U CN 216668702 U CN216668702 U CN 216668702U
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Abstract
The utility model provides a grating fiber-based liquid pressure sensing inclinometer, which belongs to the technical field of inclination measurement and comprises a shell and a sensor group, wherein the shell is provided with a plurality of optical fibers; a solution cavity is arranged in the shell, and detection liquid is contained in the solution cavity; the sensor group is arranged on the side wall of the solution cavity and comprises a plurality of first pressure sensors below the liquid level and a plurality of second pressure sensors parallel and level to the liquid level, the first pressure sensors and the second pressure sensors are in pairwise symmetry and are uniformly distributed along the circumferential direction of the solution cavity, and the horizontal planes where the first pressure sensors are located are parallel to the horizontal planes where the second pressure sensors are located. According to the liquid pressure sensing inclinometer based on the grating optical fiber, provided by the utility model, by applying the principle of grating optical fiber pressure sensing and the flowing property of the detection liquid, the angle change of a horizontal plane is calculated through the pressure change of the pressure sensor at different heights in the detection liquid, so that the measurement accuracy is improved, and the liquid pressure sensing inclinometer is simple in structure and convenient to take and use.
Description
Technical Field
The utility model belongs to the technical field of inclination measurement, and particularly relates to a liquid pressure sensing inclinometer based on a grating fiber.
Background
The inclinometer is an instrument for measuring the apex angle and azimuth angle of engineering structures such as drill holes, foundation pits, foundation foundations, walls, dam slopes and the like.
The traditional inclinometer is usually of a resistance strain type, an accelerometer type, an electronic meter type and the like, can measure the inclination angle and the displacement of an object to be measured within a moving error range, and is widely applied to engineering practice. However, the conventional inclinometer uses a cable for signal transmission, and has limited data transmission capability.
In order to ensure the transmission effect, the prior optical fiber inclinometer adopts a grating optical fiber inclinometer which utilizes the sensitivity of optical signal wavelength to strain and temperature to realize the accurate measurement of the strain and the temperature, and can prevent electromagnetic interference, has good durability and has long transmission distance.
However, in the conventional grating fiber inclinometer, the symmetrically arranged gratings are subjected to corresponding strain by means of the swinging of the pendulum bob, so as to measure the change of the wavelength reflected from the gratings to calculate the inclination angle. However, the measurement and control precision of the grating optical fiber inclinometer is not high or can be high only in small-angle measurement, the requirement on environment is high, the reliability is low, and the grating optical fiber inclinometer is not easy to be fused with other instruments.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a grating fiber-based liquid pressure sensing inclinometer, aiming at improving the measurement accuracy.
In order to achieve the purpose, the utility model adopts the technical scheme that: there is provided a grating fiber based liquid pressure sensing inclinometer, comprising:
the detection device comprises a shell, a detection device and a detection device, wherein a solution cavity is formed in the shell, and detection liquid is contained in the solution cavity;
the sensor group is arranged on the side wall of the solution cavity and comprises a plurality of first pressure sensors positioned below the liquid level and a plurality of second pressure sensors parallel to the liquid level, the first pressure sensors and the second pressure sensors are in pairwise symmetry and are uniformly distributed along the circumferential direction of the solution cavity, and the horizontal plane where the first pressure sensors are located is parallel to the horizontal plane where the second pressure sensors are located.
As another embodiment of the present application, the solution chamber is an inverted quadrangular pyramid shaped chamber, and the bottom surface of the housing is parallel to the bottom surface of the solution chamber.
As another embodiment of the present application, the volume of the detection liquid in the solution chamber is two thirds of the total volume of the solution chamber.
As another embodiment of the present application, the number of the plurality of second pressure sensors is the same as that of the plurality of first pressure sensors, and the plurality of second pressure sensors and the plurality of first pressure sensors are arranged in a one-to-one correspondence.
As another embodiment of the present application, a plane in which the two corresponding second pressure sensors and the first pressure sensor are located is perpendicular to the bottom surface of the housing.
As another embodiment of the present application, the number of the first pressure sensors is four, and four of the first pressure sensors are respectively disposed on four side walls of the solution chamber.
As another embodiment of the present application, a connection line between the second pressure sensor and the first pressure sensor on the same sidewall is located on a longitudinal centerline of the sidewall where the connection line is located.
As another embodiment of the present application, the detection liquid is a mercury liquid.
As another embodiment of this application, the holding tank has been seted up to the upper end of casing, be connected with on the casing and be used for the shutoff the closing cap of holding tank, the holding tank with the closing cap encloses out the solution chamber.
As another embodiment of this application, the casing is the cuboid, the circumference of casing has a plurality of attached planes that are used for contacting the face to be measured.
The grating fiber-based liquid pressure sensing inclinometer has the beneficial effects that: compared with the prior art, the liquid pressure sensing inclinometer based on the grating optical fiber, disclosed by the utility model, utilizes the principle of grating optical fiber pressure sensing and the flowing property of the detected liquid, and calculates the angle change of a horizontal plane through the pressure changes of different heights in the detected liquid by the pressure sensor, so that the measurement accuracy is improved, and the liquid pressure sensing inclinometer is simple in structure and convenient to take and use.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a grating fiber-based liquid pressure sensing inclinometer according to an embodiment of the present invention;
FIG. 2 is a top view of a grating fiber based liquid pressure sensing inclinometer according to an embodiment of the utility model;
fig. 3 is a sectional view of the structure taken along line a-a in fig. 2.
In the figure: 1. a housing; 2. a first pressure sensor; 3. a second pressure sensor; 4. and (7) sealing the cover.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1 to 3, a liquid pressure sensing inclinometer based on a grating fiber according to the present invention will now be described. The grating fiber-based liquid pressure sensing inclinometer comprises a shell 1 and a sensor group; a solution cavity is arranged in the shell 1, and detection liquid is contained in the solution cavity; the sensor group is located on the lateral wall of solution chamber, and the sensor group includes a plurality of first pressure sensor 2 that are located below the liquid level and a plurality of second pressure sensor 3 with the liquid level parallel and level, and a plurality of first pressure sensor 2 and a plurality of second pressure sensor 3 are two bisymmetry and along the circumference evenly distributed of solution chamber, and a plurality of first pressure sensor 2 place horizontal planes are on a parallel with a plurality of second pressure sensor 3 place horizontal planes.
Compared with the prior art, the liquid pressure sensing inclinometer based on the grating fiber is characterized in that a solution cavity is formed in a shell 1, detection liquid is filled in the solution cavity, a first pressure sensor 2 and a second pressure sensor 3 are further mounted on the side wall of the solution cavity, the first pressure sensor 2 is located below the liquid level in the solution cavity, and the second pressure sensor 3 is flush with the liquid level in the solution cavity.
When the liquid level sensor is horizontally placed, the liquid level and the plurality of second pressure sensors 3 are positioned on the same horizontal plane; the first pressure sensors 2 are positioned below the liquid level and are acted by the weight force of the detected liquid, the pressure values detected by the plurality of first pressure sensors 2 are consistent, and the pressure values are the gravity of the detected liquid at the positions; meanwhile, the height of the first pressure sensor 2 from the liquid level and the distance between the second pressure sensor 3 and the first pressure sensor 2 can be calculated according to the pressure value detected by the first pressure sensor 2.
When detecting the inclined plane angle, with the adhesion plane on the casing 1 with treat the side contact, the detection liquid in the solution chamber receives the action of gravity can take place to flow, and the pressure value that a plurality of first pressure sensor 2 detected and the pressure value that a plurality of second pressure sensor 3 detected all can change this moment. The height h of the first pressure sensor 2 from the liquid surface after the inclination can be calculated through the maximum pressure value detected by the plurality of first pressure sensors 22And the height difference between the first pressure sensor 2 and the second pressure sensor 3 after the inclination, thereby calculating the inclination angle.
According to the liquid pressure sensing inclinometer based on the grating optical fiber, provided by the utility model, by applying the principle of grating optical fiber pressure sensing and the flowing property of the detection liquid, the angle change of a horizontal plane is calculated through the pressure change of the pressure sensor at different heights in the detection liquid, so that the measurement accuracy is improved, and the liquid pressure sensing inclinometer is simple in structure and convenient to take and use.
Optionally, the first pressure sensor 2 and the second pressure sensor 3 are both grating fiber pressure sensors.
In some possible embodiments, referring to fig. 1 and 3, the solution chamber is an inverted quadrangular pyramid shaped chamber, and the bottom surface of the housing 1 is parallel to the bottom surface of the solution chamber.
The solution chamber formed in the interior of the housing 1 is an inverted rectangular pyramid, wherein the vertex angle of the inverted rectangular pyramid faces the bottom of the housing 1, and the bottom surface of the inverted rectangular pyramid is located at the upper part of the housing 1 and is parallel to the bottom surface of the housing 1.
The corresponding first pressure sensors 2 are uniformly distributed on four side walls of the inverted quadrangular pyramid-shaped solution cavity, wherein the two paired first pressure sensors 2 are respectively arranged on two symmetrical side walls of the inverted quadrangular pyramid-shaped solution cavity. The first pressure sensor 2 is provided at a position close to the apex angle.
Similarly, the plurality of second pressure sensors 3 are uniformly distributed on four side walls of the inverted quadrangular pyramid-shaped solution chamber, wherein two paired second pressure sensors 3 are respectively arranged on two symmetrical side walls of the inverted quadrangular pyramid-shaped solution chamber. The second pressure sensor 3 is provided above the first pressure sensor 2. When the detection liquid is injected into the solution cavity, the shell 1 needs to be kept in a horizontal state, and the liquid level and the second pressure sensor 3 are controlled to be positioned at the same horizontal plane.
Optionally, the volume of the detection liquid in the solution chamber is two thirds of the total volume of the solution chamber, so as to provide a flowing space for the detection liquid, thereby ensuring that the liquid level changes when the housing 1 is tilted.
In some possible embodiments, referring to fig. 3, the number of the second pressure sensors 3 is the same as that of the first pressure sensors 2, and the second pressure sensors 3 and the first pressure sensors 2 are arranged in a one-to-one correspondence.
The second pressure sensors 3 and the first pressure sensors 2 are arranged in a one-to-one correspondence manner, and when a pressure value detected by a certain first pressure sensor 2 is the maximum value, the pressure value detected by the second pressure sensor 3 corresponding to the pressure sensor can be used for calculating the inclination angle.
Specifically, the plane in which the two corresponding second pressure sensors 3 and first pressure sensor 2 are located is perpendicular to the bottom surface of the housing 1.
Optionally, when the edge and the sidewall of the inverted pyramid-shaped solution chamber are both provided with the first pressure sensor 2 and the second pressure sensor 3. The straight line where the second pressure sensor 3 and the corresponding first pressure sensor 2 are located passes through the vertex angle of the inverted rectangular pyramid.
In some possible embodiments, referring to fig. 3, four first pressure sensors 2 are provided, and four first pressure sensors 2 are respectively disposed on four side walls of the solution chamber.
Specifically, four side walls of the inverted rectangular pyramid-shaped solution cavity are provided with a first pressure sensor 2, a second pressure sensor 3 is arranged above the first pressure sensor 2, and the straight line where the first pressure sensor 2 and the second pressure sensor 3 are located passes through the vertex angle of the inverted rectangular pyramid. The first pressure sensor 2 and the second pressure sensor 3 are arranged on the side wall, so that the installation is convenient.
Alternatively, a line connecting the centers of the first pressure sensor 2 and the second pressure sensor 3 on the same side wall is located on a longitudinal centerline with the side wall.
Specifically, when the inclinometer is horizontally placed to measure the inclination angle of the ground, whether the values of the four first pressure sensors 2 in the solution cavity are consistent in the horizontal position and whether the values of the four second pressure sensors 3 in the solution cavity are consistent in the horizontal position need to be checked in advance to determine whether the inclinometer can be normally used. When horizontally placed, the four first pressure sensors 2 have the same value and the numerical control thereof is recorded as F1The values of the four second pressure sensors 3 at the horizontal liquid level are F*The height h of the first pressure sensor 2 from the liquid level can be calculated1：
The distance S between the corresponding set of first and second pressure sensors 2, 31：
The inclinometer is placed on the object to be measured, is made to contact the object, and records the pressure values F of the four first pressure sensors 2 respectively2、F3、F4、F5. Comparing to obtain the maximum pressure value F of the four first pressure sensors 2i. The maximum height h of the corresponding first pressure sensor 2 from the current liquid level can be obtained2：
And FiThe pressure value measured by the second pressure sensor 3 of the corresponding first pressure sensor 2 on the same side wall is F6Then, the height h of the second pressure sensor 3 from the present liquid level can be obtained3：
Angle theta at this time1：
Object inclination angle Δ θ at this time:
in some possible embodiments, the solution chamber contains a mercury liquid.
Specifically, the filling in the solution chamber detects the liquid, and the inclination angle is calculated from the pressures measured by the first pressure sensor 2 and the second pressure sensor 3 by the property of detecting the fluidity of the liquid. However, the liquid level fluctuation caused by the liquidity of the detection liquid is large, and the error caused by the continuous fluctuation of the liquid level is large during measurement, so that the detection liquid with high density needs to be selected, and the liquidity is prevented from being too strong. If the density of the mercury liquid is high and the mercury liquid has fluidity, when the shell 1 inclines, the fluctuation of the liquid level is small, the pressure value transmission of the pressure sensor is facilitated, errors are reduced as much as possible, and the measurement precision is improved.
In some possible embodiments, referring to fig. 3, a receiving groove is formed at the upper end of the housing 1, a sealing cover 4 for sealing the receiving groove is connected to the housing 1, and the receiving groove and the sealing cover 4 enclose a solution chamber.
Downwardly extending's holding tank is seted up to casing 1's up end, and the shape of holding tank is for falling rectangular pyramid, and the upper end of holding tank is equipped with closing cap 4, and closing cap 4 is connected with casing 1 and is used for sealing the port of holding tank to enclose out the solution chamber.
Optionally, the housing 1 is hinged to the cover 4, and the cover 4 can be opened to fill the detection liquid into the solution chamber.
Optionally, a sealing ring is arranged at the lower end of the sealing cover 4.
In some possible embodiments, referring to fig. 3, the housing 1 is a rectangular parallelepiped, and the circumference of the housing 1 has a plurality of attachment planes for contacting the surface to be measured.
An attachment plane is arranged on the side wall of the shell 1, so that the shell 1 is attached to a building, and the real-time measurement of the inclination angle of the building is realized.
Optionally, an adhesive layer is disposed on the attachment plane.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. Liquid pressure sensing inclinometer based on grating fiber is characterized by comprising:
the detection device comprises a shell, a detection device and a detection device, wherein a solution cavity is formed in the shell, and detection liquid is contained in the solution cavity;
the sensor group is arranged on the side wall of the solution cavity and comprises a plurality of first pressure sensors positioned below the liquid level and a plurality of second pressure sensors parallel to the liquid level, the first pressure sensors and the second pressure sensors are in pairwise symmetry and are uniformly distributed along the circumferential direction of the solution cavity, and the horizontal plane where the first pressure sensors are located is parallel to the horizontal plane where the second pressure sensors are located.
2. The grating fiber based liquid pressure sensing inclinometer of claim 1, wherein the solution cavity is an inverted quadrangular pyramid shaped cavity, the bottom surface of the housing being parallel to the bottom surface of the solution cavity.
3. The fiber grating-based liquid pressure sensing inclinometer of claim 2, characterized in that the volume of the detection liquid in the solution chamber is two thirds of the total volume of the solution chamber.
4. The fiber grating-based liquid pressure sensing inclinometer of claim 3, wherein the number of the second pressure sensors and the number of the first pressure sensors are the same and are arranged in one-to-one correspondence.
5. The fiber grating-based liquid pressure sensing inclinometer of claim 4, characterized in that the plane in which two corresponding said second pressure sensors and said first pressure sensor are located is perpendicular to the bottom surface of said housing.
6. The grating fiber based liquid pressure sensing inclinometer of claim 5, wherein the number of the first pressure sensors is four, and four of the first pressure sensors are respectively arranged on four side walls of the solution chamber.
7. The fiber grating-based liquid pressure sensing inclinometer of claim 6, wherein the connection line of the second pressure sensor and the first pressure sensor on the same side wall is located on the longitudinal centerline of the side wall.
8. The grating fiber based liquid pressure sensing inclinometer of any one of claims 1 to 7, characterized in that the detection liquid is a mercury liquid.
9. The grating fiber-based liquid pressure sensing inclinometer of claim 2, wherein the upper end of the housing is provided with a containing groove, the housing is connected with a sealing cover for sealing the containing groove, and the containing groove and the sealing cover enclose the solution cavity.
10. The grating fiber based liquid pressure sensing inclinometer of claim 1, characterized in that the housing is a cuboid, and the circumference of the housing has a plurality of attachment planes for contacting the surface to be measured.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220266344.7U CN216668702U (en) | 2022-02-09 | 2022-02-09 | Liquid pressure sensing inclinometer based on grating fiber |
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| CN202220266344.7U CN216668702U (en) | 2022-02-09 | 2022-02-09 | Liquid pressure sensing inclinometer based on grating fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117838082A (en) * | 2023-12-29 | 2024-04-09 | 拜赛维(北京)科技有限公司 | Intelligent monitoring device for intracranial pressure and application method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117838082A (en) * | 2023-12-29 | 2024-04-09 | 拜赛维(北京)科技有限公司 | Intelligent monitoring device for intracranial pressure and application method thereof |
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