Device for calibrating tilt angle sensor

Abstract

The utility model discloses a device for calibrating a tilt angle sensor, which comprises a platform and a liquid pipe arranged on the platform, a top plane for placing the tilt angle sensor is formed at the top of the platform, the liquid pipe extends along the length direction, the liquid pipe is parallel to the top plane of the platform, and a diaphragm is arranged in the liquid pipe. The diaphragm divides a tube cavity of the liquid tube into a first tube cavity and a second tube cavity in the length direction, and the differential pressure sensor is used for detecting the pressure difference of the two sides of the diaphragm. A method for measuring and calibrating an inclination angle sensor by adopting a total station is abandoned, the inclination angle of the platform is calculated based on the pressure difference between the first pipe cavity and the second pipe cavity in the liquid pipe inclining along with the platform, and then the actual result measured by calibration equipment is compared, so that the aim of calibration is fulfilled. According to the technical scheme, the tedious steps of carrying a total station, placing a foot stool, leveling the total station, measuring and the like required by monitoring by using the traditional total station are omitted, the efficiency is greatly improved, the cost is lower, and the precision is higher.

Description

Technical Field

[0001] The utility model is used in the field of sensor calibration, in particular to a device for calibrating an inclination sensor. Background Art

[0002] Tilt sensors are typically used for monitoring and detection, and calibration is a crucial step. Accuracy determines the accuracy of monitoring. Traditionally, tilt sensors are measured using a total station. This method requires tedious steps such as moving the instrument, placing the tripod, leveling the instrument, and then measuring. This method is inefficient, cumbersome, and offers low accuracy. Utility Model Content

[0003] The purpose of the utility model is to solve at least one of the technical problems existing in the prior art and to provide a device for calibrating an inclination sensor.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] In a first aspect, a device for calibrating an inclination sensor includes a platform and a liquid tube arranged on the platform, the top of the platform forming a top plane for placing the inclination sensor, the liquid tube extending along the length direction, the liquid tube parallel to the top plane of the platform, a diaphragm is provided in the liquid tube, the diaphragm separates the lumen of the liquid tube into a first lumen and a second lumen along the length direction, and also includes a differential pressure sensor for detecting the pressure difference on both sides of the diaphragm.

[0006] In combination with the first aspect, in certain implementations of the first aspect, the differential pressure sensor includes a strain gauge disposed on a surface of the diaphragm.

[0007] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the diaphragm separates the lumen of the liquid tube into a symmetrical first lumen and a second lumen along the length direction.

[0008] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, it also includes an inclination adjustment mechanism, which is connected to the platform and is used to adjust the inclination of the platform around an axis, and the axis is located on a plane parallel to the top plane and perpendicular to the length direction of the liquid tube.

[0009] In combination with the first aspect and the above-mentioned implementation methods, in some implementation methods of the first aspect, the inclination adjustment mechanism includes a first support leg, a second support leg and a third support leg, the first support leg and the second support leg are supported at one end of the platform, the third support leg is supported at the other end of the platform, the first support leg and the second support leg are at the same height and are symmetrically distributed on both sides of the liquid pipe, and the height of the third support leg is adjustable.

[0010] In combination with the first aspect and the above-mentioned implementations, in some implementations of the first aspect, a base is further included, and the first leg, the second leg and the third leg are placed on the top surface of the base.

[0011] In combination with the first aspect and the above-mentioned implementations, in certain implementations of the first aspect, the liquid pipe is arranged at the bottom of the platform, and both ends of the liquid pipe are bent upward to form an upward pipe opening, and the pipe opening is provided with an end cover.

[0012] In a second aspect, a method for calibrating an inclination sensor is provided, using the apparatus described in any implementation of the first aspect, wherein the inclination sensor is placed on the top plane of the platform, the first lumen and the second lumen of the liquid tube are respectively filled with liquid, the length of the liquid tube is defined as the x-axis, the direction perpendicular to the top plane of the platform is defined as the z-axis, and the direction perpendicular to the x-axis and the z-axis is defined as the y-axis. The calibration method comprises the following steps:

[0013] Measuring the pressure difference Δp1 on both sides of the diaphragm;

[0014] Adjust the platform to rotate around the y-axis, measure the pressure difference Δp2 on both sides of the diaphragm, and calculate the inclination angle α of the platform around the y-axis;

[0015] The inclination angle measured by the inclination sensor is compared with the inclination angle α.

[0016] In conjunction with the second aspect, in some implementations of the second aspect, calculating the tilt angle α includes the following steps:

[0017] Calculate the pressure difference change Δp before and after the platform rotates around the y-axis:

[0018] Δp=Δp2-Δp1

[0019] Calculate the height difference increment Δh before and after the platform rotates around the y-axis:

[0020]

[0021] Wherein, ρ is the density of the liquid in the liquid pipe, and g is the acceleration of gravity at the location of the device;

[0022] Calculate the inclination angle α of the platform around the y-axis:

[0023]

[0024] Wherein, L is the distance between the center of mass of the first lumen liquid and the center of mass of the second lumen liquid.

[0025] In combination with the second aspect and the above implementations, in some implementations of the second aspect, the tilt sensor is rotated 90° in the x-axis and y-axis planes, and the calibration method steps are repeated.

[0026] One of the above technical solutions has at least one of the following advantages or beneficial effects: The present invention's technical solution abandons the prior art method of using a total station to measure and calibrate the inclination sensor. Instead, the platform's inclination is calculated based on the pressure difference between the first and second lumens of a liquid tube that tilts along with the platform. The inclination is then compared with the actual result measured by the calibration equipment, thereby achieving the purpose of calibration. The present invention's technical solution eliminates the tedious steps required for traditional monitoring using a total station, such as transporting the total station, placing a tripod, leveling the total station, and then measuring. This significantly improves efficiency, reduces costs, and increases accuracy.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 This is an axonometric diagram of the structure of an embodiment of a device for calibrating an inclination sensor of the utility model;

[0030] Figure 2 This is a front view of the structure of an embodiment of a device for calibrating an inclination sensor of the utility model;

[0031] Figure 3 The figure is a schematic diagram of an embodiment of the device for calibrating an inclination sensor of the utility model after tilting. DETAILED DESCRIPTION

[0032] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0033] In the present invention, if there is a description of directions (up, down, left, right, front and back), it is only for the convenience of describing the technical solution of the present invention, and does not indicate or imply that the technical features referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0034] In this utility model, "several" means one or more, "multiple" means more than two, "greater than," "less than," "exceeds," etc. are understood to exclude the number itself; "above," "below," "within," etc. are understood to include the number itself. In the description of this utility model, the use of "first" or "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0035] In this utility model, unless otherwise expressly defined, terms such as "disposed," "installed," and "connected" should be interpreted broadly. For example, they may refer to direct connection or indirect connection through an intermediate medium; fixed connection or detachable connection or integral molding; mechanical connection or electrical connection or mutual communication; and internal connection between two components or interaction between two components. Those skilled in the art can reasonably determine the specific meanings of these terms in this utility model based on the specific content of the technical solution.

[0036] in, Figure 1 The reference direction coordinate system of the embodiment of the present utility model is given below. Figure 1 The embodiment of the present invention is described with reference to the direction shown.

[0037] See also Figure 1 、 Figure 2 An embodiment of the present invention provides a device for calibrating a tilt sensor, comprising a platform 4 and a liquid tube 3 disposed on the platform 4. The top of the platform 4 forms a top plane 41 for placing the tilt sensor. The liquid tube 3 is connected to the platform 4 and extends along its length, parallel to the top plane 41 of the platform 4. A diaphragm 31 is disposed in the liquid tube 3, which divides the lumen of the liquid tube 3 into a first lumen 32 and a second lumen 33 along its length. The device for calibrating the tilt sensor also includes a differential pressure sensor 5 for detecting a pressure difference across the diaphragm 31. A specific calibration method for the device for calibrating the tilt sensor is described in detail below.

[0038] The technical solution of this utility model abandons the existing method of using a total station to measure and calibrate the tilt sensor. Instead, the tilt angle of the platform 4 is calculated based on the pressure difference between the first lumen 32 and the second lumen 33 in the liquid tube 3, which tilts along with the platform 4. The inclination of the platform 4 is then compared with the actual result measured by the calibration equipment to achieve the purpose of calibration. The technical solution of this utility model eliminates the tedious steps required for traditional monitoring using a total station, such as carrying the total station, placing the tripod, leveling the total station, and measuring, thereby greatly improving efficiency, reducing costs, and improving accuracy.

[0039] In order to facilitate the placement of the inclination sensor, a slot or buckle can be set on the top plane 41 of the platform 4. The slot and buckle can limit the inclination sensor to the top plane 41 of the platform 4 along a specific direction to detect the inclination angle of the platform 4.

[0040] The differential pressure sensor 5 is used to detect the pressure difference on both sides of the diaphragm 31. In some embodiments, the differential pressure sensor 5 includes a strain gauge arranged on the surface of the diaphragm 31. The strain gauge can be made of a resistive material. When the strain gauge is mechanically deformed under the action of an external force, its resistance value changes accordingly, thereby further detecting the pressure difference on both sides of the diaphragm 31.

[0041] It is understandable that the device may also adopt other types of pressure sensors in the prior art, which will not be described in detail here.

[0042] The volumes of the first lumen 32 and the second lumen 33 are the same or different. For example, in some embodiments, the diaphragm 31 separates the lumen of the liquid tube 3 into a symmetrical first lumen 32 and a second lumen 33 along the length direction. The first lumen 32 and the second lumen 33 can be respectively injected with liquids of approximately equal weight, which facilitates debugging and use.

[0043] When calibrating the inclination sensor, the inclination of the platform 4 needs to be adjusted or varied. The inclination of the platform 4 can be adjusted by placing the platform 4 on different inclined planes, or manually. A dedicated inclination adjustment mechanism can also be provided. For example, in some embodiments, the device for calibrating the inclination sensor further includes an inclination adjustment mechanism connected to the platform 4. The inclination adjustment mechanism is used to adjust the inclination of the platform 4 about an axis, which is located in a plane parallel to the top plane 41 and perpendicular to the length of the liquid tube 3. The inclination adjustment mechanism allows the platform 4 to be tilted about the axis more accurately, avoiding errors in the data detected by the differential pressure sensor 5 due to the tilt direction deviating from the axis.

[0044] Further, in some embodiments, see Figure 1 、 Figure 2 、 Figure 3The tilt adjustment mechanism includes a first leg 11, a second leg 12 and a third leg 13. The first leg 11 and the second leg 12 are supported at one end of the platform 4, and the third leg 13 is supported at the other end of the platform 4. The first leg 11 and the second leg 12 are of the same height and symmetrically distributed on both sides of the liquid pipe 3. The height of the third leg 13 is adjustable. The third leg 13 can be adjusted in height by telescoping, or by cooperating with a stud and a screw hole. When adjusting the tilt angle of the platform 4, the height of the third leg 13 is adjusted. The direction of the line connecting the first leg 11 and the second leg 12 defines the swing axis of the platform 4, causing the platform 4 to tilt around the axis, causing the liquid pressure difference on both sides of the liquid pipe 3 to change, constituting a pressure difference change at both ends of the differential pressure sensor 5. The rotation angle of the platform 4 is calculated by the pressure difference change.

[0045] In some embodiments, see Figure 1 、 Figure 2 The device for calibrating the inclination sensor also includes a base 2, with a first support leg 11, a second support leg 12, and a third support leg 13 placed on the top surface of the base 2. The base 2 is located at the bottom of the device and provides a flat support. The first support leg 11, the second support leg 12, and the third support leg 13 are located between the platform 4 and the base 2 to achieve the function of inclination adjustment.

[0046] The liquid pipe 3 can be arranged on the side, top or bottom of the platform 4. In some embodiments, see Figure 1 、 Figure 2 The liquid tube 3 is disposed at the bottom of the platform 4. Both ends of the liquid tube 3 are bent upward to form upward-facing nozzles, which are provided with end caps. In this embodiment, the liquid tube 3 is disposed at the bottom of the platform 4, avoiding the top plane 41 of the platform 4, making it more convenient to calibrate the tilt sensor. Furthermore, the upward-facing nozzles facilitate filling the first lumen 32 and the second lumen 33 with liquid.

[0047] The embodiment of the present invention also provides a method for calibrating the tilt sensor, see Figure 1-Figure 3 Using the device of any of the above embodiments, the tilt sensor is placed on the top plane 41 of the platform 4, the first lumen 32 and the second lumen 33 of the liquid tube 3 are filled with liquid respectively, the length direction of the liquid tube 3 is the x-axis direction, the direction perpendicular to the top plane 41 of the platform 4 is the z-axis direction, and the direction perpendicular to the x-axis and the z-axis is the y-axis direction. The calibration method includes the following steps:

[0048] Measure the pressure difference Δp1 on both sides of the diaphragm 31;

[0049] The platform 4 is adjusted to rotate around the y-axis, and the pressure difference Δp2 on both sides of the diaphragm 31 is measured. The inclination angle α of the platform 4 around the y-axis is obtained by calculation;

[0050] The inclination angle measured by the inclination sensor is compared with the inclination angle α.

[0051] Specifically, see Figure 2 、 Figure 3 , the calculation of the inclination angle α includes the following steps:

[0052] Calculate the pressure difference change Δp before and after the platform 4 rotates around the y-axis:

[0053] Δp=Δp2-Δp1

[0054] Calculate the height difference increment Δh before and after the platform 4 rotates around the y-axis:

[0055]

[0056] Wherein, ρ is the density of the liquid in the liquid pipe 3, and g is the acceleration of gravity at the location of the device;

[0057] Calculate the inclination angle α of platform 4 around the y-axis:

[0058]

[0059] Wherein, L is the distance between the center of mass of the liquid in the first lumen 32 and the center of mass of the liquid in the second lumen 33.

[0060] In some embodiments, the tilt sensor is rotated 90° in the x- and y-axis planes and the calibration method steps are repeated. This embodiment can measure the angle measurement value of the tilt sensor in another direction; finally, the data measured by the tilt sensor is compared with the actual measured tilt angle, thereby achieving the purpose of calibration.

[0061] The embodiment of the utility model has a simple, compact and reasonable structure, eliminates the complicated process of traditional calibration using a total station, and greatly improves the efficiency of the inclination correction of the inclination sensor.

[0062] Throughout this specification, references to terms such as "example," "embodiment," or "some embodiments" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0063] Of course, the invention is not limited to the above-mentioned embodiments. Those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention. These equivalent modifications or substitutions are all within the scope defined by the claims of this application.

Claims

1. A device for calibrating an inclination sensor, characterized in that: The device comprises a platform and a liquid tube arranged on the platform, wherein the top of the platform forms a top plane for placing a tilt sensor, the liquid tube extends in the length direction, and the liquid tube is parallel to the top plane of the platform. A diaphragm is provided in the liquid tube, and the diaphragm separates the lumen of the liquid tube into a first lumen and a second lumen along the length direction, and further comprises a differential pressure sensor for detecting the pressure difference on both sides of the diaphragm.

2. The device for calibrating an inclination sensor according to claim 1, characterized in that: The differential pressure sensor includes a strain gauge disposed on a surface of the diaphragm.

3. The device for calibrating an inclination sensor according to claim 1, characterized in that: The diaphragm separates the lumen of the liquid tube into a first lumen and a second lumen that are symmetrical along the length direction.

4. The device for calibrating an inclination sensor according to claim 1, characterized in that: It also includes an inclination adjustment mechanism, which is connected to the platform and is used to adjust the inclination of the platform around an axis. The axis is located on a plane parallel to the top plane and perpendicular to the length direction of the liquid pipe.

5. The device for calibrating an inclination sensor according to claim 4, characterized in that: The inclination adjustment mechanism includes a first support leg, a second support leg and a third support leg. The first support leg and the second support leg are supported at one end of the platform, and the third support leg is supported at the other end of the platform. The first support leg and the second support leg are of the same height and are symmetrically distributed on both sides of the liquid pipe. The height of the third support leg is adjustable.

6. The device for calibrating an inclination sensor according to claim 5, characterized in that: The utility model further comprises a base, wherein the first supporting leg, the second supporting leg and the third supporting leg are placed on the top surface of the base.

7. The device for calibrating a tilt sensor according to claim 1, characterized in that: The liquid pipe is arranged at the bottom of the platform, and both ends of the liquid pipe are bent upward to form an upward pipe opening, and the pipe opening is provided with an end cover.

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