A decoupling structure and method for a gravity meter leveling coupling problem

Abstract

This invention relates to a decoupling structure and method for solving the leveling coupling problem of a gravimeter. The structure includes a gravimeter, three limiting components, a tripod, an X-axis bubble, and a Y-axis bubble. The three limiting components are fixed to the bottom of the gravimeter and arranged in a triangle. The first limiting component has a spherical limiting groove at its center, the second limiting component has a V-shaped positioning groove, and the limiting surface of the third limiting component is planar. The spherical limiting groove, the V-shaped positioning groove, and the limiting plane face downwards and respectively make limiting contact with the top fulcrums of the three support legs of the tripod. The top fulcrums of the three support legs of the tripod are metal hemispherical structures. The X-axis and Y-axis bubble are both installed inside the gravimeter, and are orthogonally installed at 90° on the same horizontal plane. These two bubble types reflect their tilt angle in real time and output it as an electronic signal to a display screen on the top of the gravimeter. This invention reduces the difficulty of installing the gravimeter bubble and improves the efficiency of the gravimeter's operation.

Description

Technical Field

[0001] This invention belongs to the field of gravity acceleration measuring instruments, and specifically relates to a decoupling structure and decoupling method for the leveling coupling problem of a gravimeter. Background Technology

[0002] Gravitational acceleration g is a fundamental geophysical constant, but it varies with factors such as topography, geology, altitude, and the positions of the sun and moon. Accurate measurement of gravitational acceleration is of great significance in fields such as earth science, resource exploration, and even national defense. The specialized instrument for measuring gravitational acceleration is called a gravimeter. During operation, the gravimeter needs to be leveled to ensure that its sensitive axis is aligned with the direction of gravitational acceleration. In a Cartesian coordinate system, to achieve gravimeter leveling, two orthogonally mounted bubble sensors (or tilt sensors) on the same horizontal plane need to be simultaneously leveled. Since gravimeter leveling is achieved using an external tripod, if the orthogonal coordinate system formed by the tripod and the orthogonal coordinate system formed by the two bubble sensors are not parallel (due to an angular installation error), adjusting any axis of the tripod during gravimeter leveling will affect the output of both bubble sensors, increasing the difficulty of leveling. This problem of the tripod and the two bubble sensors not being parallel is called the leveling coupling problem.

[0003] To minimize the impact of leveling coupling issues on the gravimeter, the installation error angles of the tripod and bubble coordinate system should be reduced as much as possible. However, due to the existence of machining precision and installation errors in the parts, it is impossible to completely guarantee that the two coordinate systems are parallel.

[0004] To solve the above technical problems, it is necessary to design a decoupling scheme for the gravimeter leveling coupling problem. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention proposes a decoupling structure and method for the leveling coupling problem of a gravimeter. This method can solve the instrument leveling coupling problem caused by the non-parallelism between the coordinate system formed by the two water bubbles inside the gravimeter and the leveling coordinate system of the tripod at the bottom of the gravimeter. This reduces the difficulty of installing the water bubbles in the gravimeter and improves the efficiency of the gravimeter.

[0006] One of the above-mentioned objectives of the present invention is achieved by the following technical solution: A decoupling structure for a gravimeter leveling coupling problem includes a gravimeter, a first limiting component, a second limiting component, a third limiting component, a tripod, an X-axis bubble, and a Y-axis bubble; Three limiting components are fixedly installed at the bottom of the gravimeter with screws, and the three limiting components are arranged in a triangle. The first limiting component has a spherical limiting groove in the center, the second limiting component has a V-shaped positioning groove, and the limiting surface of the third limiting component is a plane. The spherical limiting groove of the first limiting component, the V-shaped positioning groove of the second limiting component, and the limiting plane of the third limiting component face downward and respectively make limiting contact with the top fulcrum of the three support legs of the tripod. All three support legs are height-adjustable. The top supports of the three supporting legs of the tripod are the first top support, the second fixed end support, and the third top support, and the three top supports adopt a metal hemispherical structure. Both the X-axis and Y-axis water bubbles are installed inside the gravimeter. The two water bubbles are installed at 90° orthogonal angles on the same horizontal plane. The two water bubbles are used to reflect their own tilt angle in real time and output it to the display screen on the top of the gravimeter in the form of electronic signals.

[0007] Moreover, each of the three support legs consists of two parts: a lower fixed leg and an upper adjustable leg. The three lower fixed legs are fixed to the base of the tripod and contact the lower support base surface. The three top fulcrums are fixed to their respective upper adjustable legs. The lower end of the upper adjustable leg is connected to the corresponding lower fixed leg by a thread. The height of the fulcrum is adjusted by rotating the roller on the upper adjustable leg.

[0008] The second objective of this invention is achieved through the following technical solution: A decoupling method for the decoupling structure used in the above-mentioned gravimeter leveling coupling problem includes the following steps: Step 1: Loosen the fixing screws at the bottom of the gravimeter used to fix the second limiting member, so that the second limiting member can rotate around the center of the first limiting member within a certain range; Step 2: Place the gravimeter on the tripod, ensuring that the top fulcrums of the three supporting legs of the tripod are respectively engaged with the spherical limiting groove on the first limiting member, the V-shaped positioning groove on the second limiting member, and the limiting plane on the third limiting member. Step 3: Adjust the rollers on the three support legs of the tripod so that the output of the X-axis and Y-axis water bubbles are both within the set range; Step 4: Rotate the roller on the support leg corresponding to the third limit member clockwise 5 times, and record the changes in the output of the X-axis bubble and the Y-axis bubble. Step 5: If the signs of the changes in the X-axis and Y-axis bubble outputs are the same, then wrap your arms around the gravimeter on the tripod and rotate it clockwise around the central axis of the first top fulcrum to make the first adjustment until the output of the X-axis bubble returns to the value before the change. Step 6: Repeat steps 3 to 5 multiple times until the change in the X-direction bubble output does not exceed the control value. Step 7: Tighten the fixing screws of the second limiting member to fix the second limiting member relative to the gravimeter.

[0009] Furthermore, in step 3, the range is set to 0° ± control value, where the control value can be adjusted according to the user's needs.

[0010] The advantages and positive effects of this invention are as follows: This invention employs a decoupled structure consisting of a gravimeter, three limiting components, a tripod, an X-axis bubble level, and a Y-axis bubble level. By adjusting the support height of the three support legs of the tripod, and using the central axis of the top fulcrum of one of the three support legs as the rotation center, the relative position of the gravimeter and the three support legs can be adjusted. This allows the tripod coordinate system to be aligned parallel to the bubble level coordinate system, resolving the instrument leveling coupling problem caused by the non-parallelism between the gravimeter bubble level and the tripod leveling coordinate system. Furthermore, when leveling the Y-axis bubble level of the gravimeter using the tripod, the horizontality of the X-axis bubble level remains unaffected, thereby reducing the difficulty of installing the gravimeter bubble level and improving the efficiency of the gravimeter's operation. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of the decoupling structure of the present invention (the gravimeter is placed on a tripod). Figure 2 This is a diagram (bottom view) showing the distribution of the three limiting components installed at the bottom of the gravimeter. Figure 3 This is a schematic diagram showing the relative relationship between the three limiting components / tripods and the bubble coordinate system before decoupling; Figure 4 This is a schematic diagram showing the relative relationship between the three limiting components / tripods and the bubble coordinate system after decoupling. Detailed Implementation

[0012] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] For a decoupling structure of the gravimeter leveling coupling problem, please refer to [link / reference]. Figures 1-2 It mainly includes a gravimeter 1, a first limiting component 5, a second limiting component 6, a third limiting component 7, a tripod 2, an X-axis bubble 3, and a Y-axis bubble 4.

[0014] Three limiting components are fixedly installed on the bottom of the gravimeter with screws, and the three limiting components are arranged in a triangle. The first limiting component has a spherical limiting groove at its center, the second limiting component has a V-shaped positioning groove, and the limiting surface of the third limiting component is flat. The spherical limiting groove of the first limiting component, the V-shaped positioning groove of the second limiting component, and the limiting surface of the third limiting component face downwards, and respectively contact the top fulcrums of the three support legs of the tripod, restricting their position. This ensures the uniqueness and stability of the position of the gravimeter 1 after it is placed on the tripod. After the mounting screws of the second limiting component are loosened, it has a certain range of movement to achieve decoupling of the leveling coupling problem.

[0015] The top fulcrums of the three supporting legs of the tripod are the first top fulcrum 2.1, the second fixed end fulcrum 2.2, and the third top fulcrum 2.3, respectively. These three top fulcrums are made of smooth and hard metal hemispheres, which are convenient to cooperate with the spherical limiting groove on the first limiting member, the V-shaped positioning groove on the second limiting member, and the limiting plane on the third limiting member, respectively.

[0016] Each of the three support legs consists of two parts: a lower fixed leg and an upper adjustable leg. The three lower fixed legs are fixed to the base of the tripod and contact the lower support surface. The three top fulcrums are fixed to their respective upper adjustable legs. The lower end of the upper adjustable leg is connected to the corresponding lower fixed leg by a thread. The height of the fulcrum is adjusted by rotating the roller on the upper adjustable leg.

[0017] Both the X-axis bubble and the Y-axis bubble are installed inside the gravimeter 1. The two bubbles are installed at 90° orthogonal angles on the same horizontal plane. The bubbles can reflect their tilt angle in real time and output it to the display screen on the top of the gravimeter 1 in the form of electronic signals.

[0018] A decoupling scheme for the leveling coupling problem of a gravimeter aims to align the line connecting the center point of the spherical limiting groove and the midpoint of the V-shaped positioning groove with the X-direction bubble installation direction, and to ensure that the center of the limiting plane on the third limiting member lies on the vertical central axis of this line, which is parallel to the Y-direction bubble installation direction. After decoupling, adjusting the rollers on the support leg corresponding to the third limiting member only changes the attitude of the Y-direction bubble, with minimal impact on the attitude and output of the X-direction bubble, thereby improving work efficiency. An example of the leveling coupling problem is shown below. Figure 3 and Figure 4 As shown, where Figure 3 This is the state before decoupling. Figure 4 The effect after decoupling according to the present invention is shown.

[0019] For a decoupling method for the gravimeter leveling coupling problem, please refer to [link / reference]. Figures 3-4 Specifically, it includes the following steps: Step 1: Loosen the fixing screws at the bottom of the gravimeter 1 used to fix the second limiting member, so that the second limiting member can rotate around the center of the first limiting member within a certain range; Step 2: Place the gravimeter 1 on the tripod, ensuring that the top fulcrums of the three supporting legs of the tripod are respectively engaged with the spherical limiting groove on the first limiting member, the V-shaped positioning groove on the second limiting member, and the limiting plane on the third limiting member. Step 3: Adjust the rollers on the three support legs of the tripod so that the output of the X-axis and Y-axis water bubbles are both within the set range; the set range is: 0° ± control value, where the control value can be adjusted according to the user's needs, and a control value of 3″ is generally recommended. Step 4: Rotate the roller on the support leg corresponding to the third limit member clockwise 5 times, and record the changes in the output of the X-axis bubble and the Y-axis bubble. Step 5: If the signs of the changes in the X-axis bubble and the Y-axis bubble output are the same, then wrap your arms around the gravimeter 1 on the tripod and rotate it clockwise around the central axis of the first top fulcrum to make the first adjustment until the output of the X-axis bubble returns to the value before the change. Step 6: Repeat steps 3 to 5 multiple times until the change in the X-axis bubble output does not exceed the control value, i.e., the range of 0° ± control value. Step 7: Tighten the fixing screws of the second limiting member to fix the second limiting member relative to the gravimeter 1.

[0020] It should be noted that: since different models of gravimeters may have different definitions for the X-direction bubble and the Y-direction, when decoupling, the direction of rotation of the gravimeter 1 around the tripod corresponding to the top fulcrum of the spherical limiting groove may be opposite, depending on the specific situation. The final effect is to restore the output of the X-direction bubble 4 to the range of 0° ± control value.

[0021] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A decoupling structure for a gravimeter leveling coupling problem, characterized in that: Includes a gravimeter, a first limiting component, a second limiting component, a third limiting component, a tripod, an X-axis bubble, and a Y-axis bubble; Three limiting components are fixedly installed at the bottom of the gravimeter with screws, and the three limiting components are arranged in a triangle. The first limiting component has a spherical limiting groove in the center, the second limiting component has a V-shaped positioning groove, and the limiting surface of the third limiting component is a plane. The spherical limiting groove of the first limiting component, the V-shaped positioning groove of the second limiting component, and the limiting plane of the third limiting component face downward and respectively make limiting contact with the top fulcrum of the three support legs of the tripod. All three support legs are height-adjustable. The top supports of the three supporting legs of the tripod are the first top support, the second fixed end support, and the third top support, and the three top supports adopt a metal hemispherical structure. Both the X-axis and Y-axis water bubbles are installed inside the gravimeter. The two water bubbles are installed at 90° orthogonal angles on the same horizontal plane. The two water bubbles are used to reflect their own tilt angle in real time and output it to the display screen on the top of the gravimeter in the form of electronic signals.

2. The decoupling structure for the gravimeter leveling coupling problem according to claim 1, characterized in that: Each of the three support legs consists of two parts: a lower fixed leg and an upper adjustable leg. The three lower fixed legs are fixed to the base of the tripod and contact the lower support base surface. The three top fulcrums are fixed to their respective upper adjustable legs. The lower end of the upper adjustable leg is connected to the corresponding lower fixed leg by a thread. The height of the fulcrum is adjusted by rotating the roller on the upper adjustable leg.

3. A decoupling method for a decoupling structure employing the decoupling structure for the gravimeter leveling coupling problem as described in any one of claims 1-2, characterized in that: Includes the following steps: Step 1: Loosen the fixing screws at the bottom of the gravimeter used to fix the second limiting member, so that the second limiting member can rotate around the center of the first limiting member within a certain range; Step 2: Place the gravimeter on the tripod, ensuring that the top fulcrums of the three supporting legs of the tripod are respectively engaged with the spherical limiting groove on the first limiting member, the V-shaped positioning groove on the second limiting member, and the limiting plane on the third limiting member. Step 3: Adjust the rollers on the three support legs of the tripod so that the output of the X-axis and Y-axis water bubbles are both within the set range; Step 4: Rotate the roller on the support leg corresponding to the third limit member clockwise 5 times, and record the changes in the output of the X-axis bubble and the Y-axis bubble. Step 5: If the signs of the changes in the X-axis and Y-axis bubble outputs are the same, then wrap your arms around the gravimeter on the tripod and rotate it clockwise around the central axis of the first top fulcrum to make the first adjustment until the output of the X-axis bubble returns to the value before the change. Step 6: Repeat steps 3 to 5 multiple times until the change in the X-direction bubble output does not exceed the control value. Step 7: Tighten the fixing screws of the second limiting member to fix the second limiting member relative to the gravimeter.

4. The decoupling method according to claim 3, employing the decoupling structure for the gravimeter leveling coupling problem as described in any one of claims 1-2, is characterized in that: In step 3, the range is set to 0° ± control value, where the control value can be adjusted according to the user's needs.

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