A sensor calibration device

Abstract

This utility model belongs to the technical field of instrument calibration and measurement equipment, specifically relating to a sensor calibration device. It includes a base; two supports spaced apart on the base; a first rotating mechanism disposed between the two supports, with both ends of the first rotating mechanism rotatably connected to the supports; a second rotating mechanism disposed on the first rotating mechanism, with its rotation axis orthogonal to that of the first rotating mechanism; and a clamping member disposed on the turntable of the second rotating mechanism for clamping and fixing the sensor in cooperation with the turntable. This utility model addresses the problem of low measurement efficiency in previous calibration devices. By setting the first rotating mechanism between the two supports, and the rotation direction of the second rotating mechanism being orthogonal to that of the first rotating mechanism, the sensor under test is fixed on the turntable of the second rotating mechanism, enabling precise rotation in three directions. This is suitable for calibrating MEMS sensors in three directions with a single clamping.

Description

Technical Field

[0001] This utility model belongs to the technical field of instrument calibration and measurement equipment, and specifically relates to a sensor calibration device. Background Technology

[0002] MEMS accelerometers, with their advantages of small size, low cost, and low power consumption, have become core sensors in consumer electronics, automotive, aerospace, and industrial control. However, their measurement accuracy is susceptible to various errors, making calibration a crucial step in ensuring performance meets standards.

[0003] Currently, sensor calibration primarily employs static gravity calibration to calibrate parameters such as static sensitivity and static linearity. However, current calibration devices can only calibrate the sensor from one direction. This requires fixing the sensor in multiple standard XYZ axes on the calibration device, utilizing gravitational acceleration in conjunction with projections from different orientations, and then performing multiple measurements to obtain the output value. This method results in low measurement efficiency. Utility Model Content

[0004] To address the shortcomings of existing technologies, a sensor calibration device is provided to solve the problem of low measurement efficiency in previous calibration devices.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a sensor calibration device, comprising: a base;

[0006] Two brackets are spaced apart on the base;

[0007] A first rotating mechanism is disposed between the two supports, and both ends of the first rotating mechanism are rotatably connected to the supports;

[0008] A second rotating mechanism is disposed on the first rotating mechanism, and the rotating shaft of the second rotating mechanism is orthogonal to the rotating shaft of the first rotating mechanism;

[0009] A clamping member is disposed on the turntable of the second rotating mechanism and is used to cooperate with the turntable to clamp and fix the sensor.

[0010] Compared with existing technologies, the above technical solutions have the following beneficial effects:

[0011] By setting a first rotating mechanism between two supports, and rotating a second rotating mechanism in a direction orthogonal to the first rotating mechanism, the sensor under test is fixed on the turntable of the second rotating mechanism, which can achieve precise rotation in three directions. This is suitable for calibrating MEMS sensors in three directions with a single clamping.

[0012] Based on the above technical solution, the embodiments of this application can be further improved as follows:

[0013] In one embodiment, the first rotating mechanism includes:

[0014] Two rotating parts are respectively installed on opposite sides of the two brackets;

[0015] A connecting plate, the two ends of which are respectively connected and fixed to the working surfaces of the two rotating parts, and the second rotating mechanism is disposed on the connecting plate.

[0016] In one embodiment, at least one of the two rotating members includes a rotary slide, the rotary slide comprising: a base plate;

[0017] A fine-tuning disc is rotatably connected to the base plate, and adjustment columns are provided on the circumference of the fine-tuning disc;

[0018] A coarse adjustment disc is rotatably connected to the fine adjustment disc via a coaxial core. The surface of the coarse adjustment disc is the working surface, and a handle is provided on the circumferential surface of the coarse adjustment disc.

[0019] An adjustment seat is provided on one side of the base plate. A fine adjustment differential is screwed onto the adjustment seat. The end of the fine adjustment differential abuts against the adjustment column and is used to drive the fine adjustment disk to rotate.

[0020] The locking screw has its end passing through the circumference of the fine adjustment plate and abutting against the coarse adjustment plate, thereby restricting the fine adjustment plate and the coarse adjustment plate from rotating synchronously.

[0021] By setting fine-tuning and coarse-tuning dials, the angle and position of the sensor on the working surface can be precisely adjusted.

[0022] In one embodiment, the second rotating mechanism is the rotary slide.

[0023] In one embodiment, the coarse adjustment disc has a scale on its circumference, and the base plate has an indicator block on its side opposite to the scale.

[0024] In one embodiment, a mounting plate is provided on the worktable of the second rotating mechanism, and a plurality of mounting holes are arranged in an array on the mounting plate. A plurality of through holes corresponding to the mounting holes are spaced apart on the clamping member, and the clamping member cooperates with the worktable to clamp the sensor on both sides.

[0025] In one embodiment, the rotating shaft of the first rotating mechanism is arranged in a horizontal direction, and the rotating shaft of the second rotating mechanism is perpendicular to the rotating shaft of the first rotating mechanism.

[0026] In one embodiment, a leveling device is provided at each of the four corners of the base, the leveling device comprising:

[0027] The leveling bolt has its end passing through the base;

[0028] A lock nut is screwed between the leveling bolt and the base to secure the leveling bolt.

[0029] The leveling devices at the four corners of the base can be adjusted to maintain a horizontal position when the entire calibration device is not placed on a horizontal surface, which facilitates subsequent calibration measurements. Attached Figure Description

[0030] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0032] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle.

[0033] Figure label:

[0034] 1. Base; 2. Support; 3. First rotating mechanism; 4. Second rotating mechanism; 5. Clamping component;

[0035] 301. Rotating component; 302. Connecting plate;

[0036] 3011, Base plate; 3012, Fine adjustment dial; 3013, Adjustment column; 3014, Coarse adjustment dial; 3015, Handle; 3016, Adjustment seat; 3017, Fine adjustment differential; 3018, Locking screw; 3019, Indicator block;

[0037] 6. Mounting plate; 7. Mounting hole; 8. Leveling bolt; 9. Locking nut. Detailed Implementation

[0038] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0039] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application shall have the ordinary meaning as understood by one of ordinary skill in the art to which this utility model pertains.

[0040] In the description of this application, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly defined.

[0042] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0043] like Figure 1 As shown, the sensor calibration device provided by this utility model includes: a base, two supports, a first rotating mechanism, a second rotating mechanism, and a clamping component.

[0044] Two brackets are spaced apart on the base. A first rotating mechanism is disposed between the two brackets. The two ends of the first rotating mechanism are rotatably connected to the brackets, so that the first rotating mechanism can be suspended between the two brackets and can rotate around the connection point at both ends. A second rotating mechanism is disposed on the first rotating mechanism. The rotation axis of the second rotating mechanism is orthogonal to the rotation axis of the first rotating mechanism, so that when the first rotating mechanism and the second rotating mechanism rotate around their respective axes, they can match the XYZ three-axis directions of a sensor.

[0045] To ensure that the sensor is fixed on the calibration device, a clamping component is provided on the turntable of the second rotating mechanism. The clamping component cooperates with the turntable to clamp and fix the sensor on the second rotating mechanism, ensuring that it does not shake during calibration measurement.

[0046] By setting a first rotating mechanism between two supports, and rotating a second rotating mechanism in a direction orthogonal to the first rotating mechanism, the sensor under test is fixed on the turntable of the second rotating mechanism, which can achieve precise rotation in three directions. This is suitable for calibrating MEMS sensors in three directions with a single clamping.

[0047] Specifically, the first rotating mechanism includes two rotating parts and a connecting plate.

[0048] Two rotating components are respectively installed on opposite sides of the two brackets. The rotating components can be implemented by means of a rotating shaft, etc. The two ends of the connecting plate are respectively connected and fixed to the working surfaces of the two rotating components, so that the two rotating components can drive the connecting plate to rotate. The second rotating mechanism is set on the connecting plate, thereby driving the second rotating mechanism to rotate around the axis of the first rotating mechanism.

[0049] In this embodiment, in order to control and adjust the rotation angle of the first rotating mechanism, at least one of the two rotating components includes a rotating slide. The rotating slide includes: a base plate, a fine adjustment plate, an adjustment column, a coarse adjustment plate, a handle, an adjustment seat, a fine adjustment differential, and a locking screw.

[0050] The fine adjustment disc is rotatably connected to the base plate. An adjustment column is provided on the circumference of the fine adjustment disc. The outer circumference of the coarse adjustment disc is located on the same circumference as the outer circumference of the fine adjustment disc. The coarse adjustment disc is coaxially nested and rotatably connected to the fine adjustment disc. The surface of the coarse adjustment disc is the working surface, that is, when the coarse adjustment disc rotates, it can drive the sensor on it to rotate. A handle is provided on the circumference of the coarse adjustment disc, which allows the operator to easily hold and rotate the entire coarse adjustment disc.

[0051] An adjustment seat is located on one side of the base plate. A fine adjustment differential is screwed onto the adjustment seat. The adjustment seat is opposite to the circumferential surface of the fine adjustment disk. The end of the fine adjustment differential abuts against the adjustment column. The fine adjustment differential is the differential in a micrometer screw gauge, which can control the extension length to a high degree of precision. The end of the differential pushes the fine adjustment disk to rotate, thereby controlling the high-precision rotation of the fine adjustment disk to achieve fine adjustment.

[0052] After the end of the locking screw passes through the circumference of the fine adjustment disc, it abuts against the coarse adjustment disc to restrict the fine adjustment disc and the coarse adjustment disc from rotating synchronously. That is, when the locking screw is tightened, the fine adjustment disc and the coarse adjustment disc can rotate synchronously, and then the fine adjustment can be controlled by the differential. After the locking screw is loosened, the coarse adjustment disc can be rotated in a wide range for coarse adjustment by the handle.

[0053] By setting fine-tuning and coarse-tuning dials, the angle and position of the sensor on the working surface can be precisely adjusted.

[0054] Similarly, to ensure the adjustment of the rotation angle of the second rotating mechanism, the second rotating mechanism is the rotating slide.

[0055] To facilitate viewing the rotation angle during adjustment, the coarse adjustment dial is provided with a scale on its circumference, and the side of the base plate is provided with an indicator block opposite to the scale. By coordinating the indicator block with the scale, the rotation angle can be viewed. Specifically, the indicator block is provided with scale lines corresponding to the scale.

[0056] To facilitate sensor installation, a mounting plate is provided on the worktable of the second rotating mechanism. The mounting plate has an array of mounting holes, the direction of which is consistent with the direction of the first and second rotating mechanisms. The clamping member has several through holes spaced apart, corresponding to the mounting holes. The clamping member is a strip-shaped clamping member, and fasteners such as bolts are inserted into the through holes to connect with the mounting holes on the mounting plate. This allows the clamping member to cooperate with the worktable to clamp the sensor on both sides, thus fixing the sensor on the worktable of the second rotating mechanism.

[0057] In this embodiment, the rotating shaft of the first rotating mechanism is arranged in a horizontal direction, the two rotating parts in the first rotating mechanism are arranged at the same height on the bracket, and the rotating shaft of the second rotating mechanism is perpendicular to the rotating shaft of the first rotating mechanism.

[0058] To ensure that the entire sensor calibration device is on a horizontal plane, leveling devices are provided at the four corners of the base. The leveling devices include leveling bolts and locking nuts.

[0059] The end of the leveling bolt passes through the base and is screwed to the base. A locking nut is screwed between the leveling bolt and the base to tighten the leveling bolt. After the leveling bolt is rotated into place, the locking nut is tightened to abut against the surface of the base, fixing the leveling bolt at a specific height. The leveling devices set at the four corners of the base can be adjusted to maintain a horizontal state when the entire calibration device is not placed on a horizontal surface, which facilitates subsequent calibration and measurement.

[0060] In practical use, firstly, use the leveling device to place the entire base on a horizontal plane. Specifically, a high-precision electronic angle meter can be used to check whether the base is horizontal. Then, fix the sensor to be tested on the worktable of the second rotating mechanism using the clamping device. When performing calibration measurements in three directions, first adjust the worktable of the second rotating mechanism to be horizontal, then rotate the first rotating mechanism to measure the vertical direction of the sensor. Next, keep the worktable of the second rotating mechanism in a vertical state, rotate the second rotating mechanism to drive the sensor to rotate in the vertical plane, and then rotate the second rotating mechanism clockwise and counterclockwise respectively to measure the last two directions of the sensor. In this way, one fixation and three-direction calibration measurements can be completed.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sensor calibration device, characterized in that, include: Base; Two brackets are spaced apart on the base; A first rotating mechanism is disposed between the two supports, and both ends of the first rotating mechanism are rotatably connected to the supports; A second rotating mechanism is disposed on the first rotating mechanism, and the rotating shaft of the second rotating mechanism is orthogonal to the rotating shaft of the first rotating mechanism; A clamping member is disposed on the turntable of the second rotating mechanism and is used to cooperate with the turntable to clamp and fix the sensor.

2. The sensor calibration device according to claim 1, characterized in that, The first rotating mechanism includes: Two rotating parts are respectively installed on opposite sides of the two brackets; A connecting plate, the two ends of which are respectively connected and fixed to the working surfaces of the two rotating parts, and the second rotating mechanism is disposed on the connecting plate.

3. The sensor calibration device according to claim 2, characterized in that, At least one of the two rotating components includes a rotary slide, the rotary slide comprising: a base plate; A fine-tuning disc is rotatably connected to the base plate, and adjustment columns are provided on the circumference of the fine-tuning disc; A coarse adjustment disc is rotatably connected to the fine adjustment disc via a coaxial core. The surface of the coarse adjustment disc is the working surface, and a handle is provided on the circumferential surface of the coarse adjustment disc. An adjustment seat is provided on one side of the base plate. A fine adjustment differential is screwed onto the adjustment seat. The end of the fine adjustment differential abuts against the adjustment column and is used to drive the fine adjustment disk to rotate. The locking screw has its end passing through the circumference of the fine adjustment plate and abutting against the coarse adjustment plate, thereby restricting the fine adjustment plate and the coarse adjustment plate from rotating synchronously.

4. The sensor calibration device according to claim 3, characterized in that, The second rotating mechanism is the rotary slide.

5. The sensor calibration device according to claim 3, characterized in that, The coarse adjustment disc has graduations on its circumference, and the base plate has an indicator block on its side that corresponds to the graduations.

6. The sensor calibration device according to claim 1, characterized in that, The second rotating mechanism has a mounting plate on its worktable, and a plurality of mounting holes are arranged in an array on the mounting plate. The clamping member has a plurality of through holes spaced apart from the mounting holes. The clamping member cooperates with the worktable to clamp the sensor on both sides.

7. The sensor calibration device according to claim 1, characterized in that, The rotating shaft of the first rotating mechanism is arranged in a horizontal direction, and the rotating shaft of the second rotating mechanism is perpendicular to the rotating shaft of the first rotating mechanism.

8. The sensor calibration device according to claim 1, characterized in that, The base is equipped with leveling devices at its four corners, and the leveling devices include: The leveling bolt has its end passing through the base; A lock nut is screwed between the leveling bolt and the base to secure the leveling bolt.

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