Acceleration sensor frequency response test tool

Abstract

An acceleration sensor frequency response test tool comprises a base, a left wall plate and a right wall plate arranged at two ends of the base, a rotating shaft arranged between the left wall plate and the right wall plate, a motor driving the rotating shaft to rotate, and a sensor mounting plate and a connector mounting plate arranged on the rotating shaft. According to the utility model, the sensor mounting plate and the connector mounting plate are arranged on the rotating shaft, the sensor and the connector are respectively mounted on the sensor mounting plate and the connector mounting plate, and the motor is adopted to drive the rotating shaft to rotate, so that the sensor and the connector synchronously rotate, and the measurement of low-frequency frequency response is realized.

Description

Technical Field

[0001] This utility model relates to a sensor testing fixture, specifically an accelerometer frequency response testing fixture. Background Technology

[0002] Frequency response is a crucial indicator of sensor performance. It refers to the relative change in sensor sensitivity compared to a reference sensitivity at different frequencies, expressed as a percentage. It reflects the sensor's ability to respond to the frequency of an input signal, ensuring it can operate normally and output accurate measurement results within a certain frequency range. To guarantee sensor performance, frequency response testing is required after sensor manufacturing. Currently, frequency response testing is typically performed on a vibration table. However, if more accurate test results are required, an expensive vibration table is necessary, resulting in high costs. Utility Model Content

[0003] This invention addresses the problem of high cost and price of vibration tables required for current sensor frequency response testing by proposing a new testing fixture for accelerometer frequency response. This fixture has a simple structure, low cost, and high accuracy in test results.

[0004] The technical means adopted by this utility model to solve the above-mentioned problems is as follows: an accelerometer frequency response testing fixture, including a base, a left wall plate and a right wall plate disposed at both ends of the base, a rotating shaft disposed between the left wall plate and the right wall plate, a motor driving the rotating shaft, a sensor mounting plate and a connector mounting plate disposed on the rotating shaft. The accelerometer sensor is mounted on the sensor mounting plate, and the connector is mounted on the connector mounting plate. Driven by the motor, the accelerometer rotates together with the rotating shaft to perform the test.

[0005] Furthermore, a motor mounting bracket is provided on the side of the left wall panel away from the right wall panel, and the motor is mounted on the motor mounting bracket.

[0006] Furthermore, bearings are provided on both the left and right wall panels, with the two ends of the rotating shaft extending into the bearings of the left and right wall panels, respectively.

[0007] Furthermore, the drive shaft of the motor is connected to the rotating shaft via a coupling, thereby driving the rotating shaft to rotate synchronously with the motor.

[0008] Furthermore, a connector mounting plate is provided on the right wall panel away from the left wall panel on the base. A rotary connector is provided on the connector mounting plate. The cable of the acceleration sensor passes through the inside of the right wall panel and is connected to the rotary connector, and then connected to the outside through the rotary connector.

[0009] Furthermore, a through hole is provided at one end of the rotating shaft near the right wall panel, with one end of the through hole located on the left side of the right wall panel and the other end located on the right side of the right wall panel, through which the cable passes.

[0010] Furthermore, a cover plate is provided on the right wall panel away from the left wall panel to prevent the bearing and rotating shaft from slipping out.

[0011] Furthermore, two sensor mounting plates and two connector mounting plates are provided, symmetrically arranged radially along the rotation axis to ensure balance during testing.

[0012] Furthermore, tie rods are provided at the top of the left and right wall panels to connect them, ensuring the stability of the entire structure during rotation.

[0013] The beneficial effects of this utility model are:

[0014] 1. This utility model achieves low-frequency response measurement by setting a sensor mounting plate and a connector mounting plate on a rotating shaft, mounting the sensor and connector on the sensor mounting plate and the connector mounting plate respectively, and using a motor to drive the rotating shaft to rotate, thereby making the sensor and connector rotate synchronously.

[0015] 2. This utility model uses a rotary joint to connect the accelerometer cable to an external cable, so that the accelerometer cable can rotate synchronously with the rotating shaft and output signals. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0017] Figure 2 for Figure 1 Enlarged view of a portion;

[0018] In the diagram: 101. Sensor, 102. Connector, 103. Cable, 1. Base, 11. Left wall panel, 12. Right wall panel, 13. Connector mounting plate, 14. Motor mounting base, 15. Tie rod, 16. Cover plate, 2. Rotary shaft, 21. Sensor mounting plate, 22. Connector mounting plate, 3. Motor, 4. Coupling, 5. Rotary joint, 6. Bearing. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The drawings are for illustrative purposes only, representing schematic diagrams only, not actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. Example 1

[0020] An accelerometer frequency response testing fixture, such as Figure 1As shown, the fixture includes a base 1, with an upright left wall plate 11 at the left end and an upright right wall plate 12 at the right end. A right motor mounting base 14 is mounted on the left side wall of the left wall plate 1, and an upright connector mounting plate 13 is mounted on the right side of the right wall plate 12. The motor mounting base 14 can be directly mounted on the left wall plate 1 in contact with its left wall, or it can be mounted on the base 1 while maintaining a certain distance from the left wall plate 1. The connector mounting plate 13 is preferably positioned at a certain distance from the right wall plate 12. A tie rod 15 is provided at the top of the left wall plate 11 and the right wall plate 12 to connect them, ensuring the stability of the entire testing fixture during use.

[0021] like Figure 1 and Figure 2 As shown, bearings 6 are provided on both the left wall panel 11 and the right wall panel 12. In this embodiment, deep groove ball bearings are used. A rotating shaft 2 extends into the bearings 6 at both ends. A motor 3 is located on the left side of the motor mounting base 14, and a coupling 4 is provided inside the motor mounting base 14. In this embodiment, a perforated coupling is used. The drive shaft of the motor 3 and the rotating shaft 2 both extend into the motor mounting base 14 and are connected by the coupling 4. Then, the motor 3 drives the rotating shaft 2 to rotate. The bearings 6 on the left wall panel 11 and the right wall panel 12 allow the rotating shaft 2 to rotate freely. A cover plate 16 is provided on the right side wall of the right wall panel 12 to block the bearings 6 and the rotating shaft 2, preventing them from protruding to the right. The motor mounting base 14 on the left side can also prevent the bearings 6 and the rotating shaft 2 from protruding from the left side.

[0022] like Figure 1 As shown, a sensor mounting plate 21 and a connector mounting plate 22 are provided at the position of the rotating shaft 2 between the left wall plate 11 and the right wall plate 12. The sensor mounting plate 21 is close to the left wall plate 11, and the connector mounting plate 22 is close to the right wall plate 12. A through hole is provided at the position of the rotating shaft 2 near the right wall plate 12, with one end of the through hole located on the left side of the right wall plate 12 and the other end located on the right side of the right wall plate 12, connecting the two sides of the right wall plate 12. During testing, the accelerometer 101 is mounted on the sensor mounting plate 21, and the connector 102 is mounted on the connector mounting plate 22. The cable 102 passes through the through hole of the rotating shaft 2 to send out the signal generated by the accelerometer. In addition, a rotary connector 5 is provided on the connector mounting plate 13. The cable 103 extending out of the through hole of the rotating shaft 2 is connected to the rotary connector 5, so that the cable 103 on the left side of the rotary connector 5 can rotate synchronously with the rotating shaft 2, while the cable connected to the right side of the rotary connector 5 will not rotate, thus not affecting the signal output.

[0023] To ensure rotational stability, this embodiment provides two sensor mounting plates 21 and connector mounting plates 22, both symmetrically arranged on both sides of the rotation axis 2 radially. During testing, two sensors 101 are mounted on the two sensor mounting plates 21 respectively, and two connectors 102 are mounted on the two connector mounting plates 22 respectively, ensuring symmetrical balance on both sides of the rotation axis 2 during rotation. However, since the cable 103 on the left side of the rotary joint 5 needs to rotate synchronously, while the cable on the right side of the rotary joint 5 cannot rotate, it is best to test only one accelerometer at a time, and the cable of the other accelerometer is not connected to the rotary joint 5, only for balancing.

[0024] The testing principle is as follows: When the motor drives the sensor to rotate, the measured signal is the cosine of the angle θ between the gravitational acceleration and the sensor's sensitive direction, g*cosθ, which is a sine wave. When the rotation speed changes, sine waves of different frequencies can be obtained, which is equivalent to inputting measured signals of different frequencies into the sensor, thereby testing the sensor's frequency response.

[0025] In this embodiment, up, down, left, and right are relative terms and can be adjusted as needed in actual use.

[0026] The above embodiments are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the protection scope of the present invention, which should be defined by the claims.

Claims

1. A frequency response testing fixture for an accelerometer, characterized in that: It includes a base, a left wall plate and a right wall plate located at both ends of the base, a rotating shaft located between the left wall plate and the right wall plate, a motor that drives the rotating shaft to rotate, and a sensor mounting plate and a connector mounting plate located on the rotating shaft.

2. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: A motor mounting bracket is provided on the side of the left wall panel away from the right wall panel, and the motor is mounted on the motor mounting bracket.

3. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: Bearings are provided on both the left and right wall panels, and the two ends of the rotating shaft extend into the bearings of the left and right wall panels, respectively.

4. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: The drive shaft of the motor is connected to the rotating shaft by a coupling, which in turn drives the rotating shaft to rotate synchronously with the motor.

5. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: A connector mounting plate is provided on the right wall panel of the base, away from the left wall panel. A rotary connector is provided on the connector mounting plate. The cable of the acceleration sensor passes through the inside of the right wall panel and is connected to the rotary connector, and then connected to the outside through the rotary connector.

6. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: A through hole is provided at one end of the rotating shaft near the right wall panel, with one end of the through hole located on the left side of the right wall panel and the other end located on the right side of the right wall panel. The cable passes through the through hole.

7. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: The right wall panel, away from the left wall panel, has a cover plate that blocks the bearing and the rotating shaft.

8. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: There are two sensor mounting plates and two connector mounting plates, which are symmetrically arranged radially along the rotation axis.

9. The accelerometer frequency response testing fixture as described in claim 1, characterized in that: Tie rods connecting the left and right wall panels are located at the top of the wall panels.

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