Transverse sensitivity ratio calibration device for vibration sensor
By using a combination of coarse calibration device and fine calibration device in the vibration sensor, and using a single-axis vibration table test, automatic calibration of the lateral sensitivity ratio is achieved, solving the rotation asymmetry around the sensitive axis in the prior art and the adjustment accuracy is low. The problem of improvements in calibration accuracy and stability.
Patent Information
- Application Number
- CN202421421197.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-20
- Publication Date
- 2024-12-06
- Estimated Expiration
- 2034-06-20
AI Technical Summary
In the prior art, the lateral sensitivity of the vibration sensor is more symmetrical and has lower adjustment accuracy when rotating around the sensitive axis, resulting in greater lateral sensitivity than test errors, and it is impossible to automatically find the direction of the maximum lateral vibration sensitivity.
Using a vibration sensor lateral sensitivity ratio automatic calibration device including a coarse calibration device and a fine calibration device, through a single-axis vibration table test, the calibrated sensor is automatically calibrated by using a coarse adjustment knob screw and a fine rotation platform, and the transverse direction can be found at 360° rotation. Direction of maximum vibration sensitivity.
It effectively solves the problem that the lateral sensitivity is smaller than the calibration acceleration, realizes automatic calibration of the lateral sensitivity ratio, improves calibration accuracy and stability, and is easy to install. It can set the reference frequency point and reference magnitude according to the needs of the user. and residence time.
Smart Images
Figure CN222125288U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of vibration sensor calibration, in particular to a vibration sensor lateral sensitivity ratio calibration device. Background Art
[0002] The output of the accelerometer can be decomposed into acceleration along the sensitive axis and acceleration in the plane perpendicular to the ideal sensitive axis (lateral acceleration) through vector decomposition. Lateral sensitivity refers to the ratio of input to output of the vibration sensor when it vibrates perpendicular to the sensitive axis. The lateral sensitivity ratio is the ratio of lateral sensitivity to axial sensitivity, which is used to evaluate the performance of the accelerometer. The lateral sensitivity ratio is an inherent characteristic of various accelerometers, usually caused by the processing, assembly and sensitive principle of the vibration sensor. The larger the lateral sensitivity ratio, the worse the sensor manufacturing process and performance. In the uniaxial vibration table test method, the traditional method has problems such as asymmetry when rotating around the sensitive axis, which makes the lateral sensitivity ratio have certain errors, and the adjustment in the direction of the vertical sensitive axis lacks precision, which affects the lateral sensitivity direction angle parameters, thereby introducing measurement errors; and the device cannot automatically find the direction of the maximum lateral vibration sensitivity. Utility Model Content
[0003] The problem to be solved by the utility model is to provide a vibration sensor lateral sensitivity ratio calibration device, so as to overcome the problem that the lateral sensitivity ratio calibration technology of the vibration sensor in the prior art is asymmetric and has low accuracy when rotating around the sensitive axis, resulting in large lateral sensitivity ratio test errors.
[0004] In order to solve the above problems, the utility model provides a vibration sensor lateral sensitivity ratio calibration device. In order to achieve the above purpose, the technical solution adopted by the utility model to solve its technical problems is:
[0005] A vibration sensor lateral sensitivity ratio calibration device comprises: a coarse calibration device, comprising a coarse calibration device fixture base, the top of the coarse calibration device fixture base is provided with a first vertical threaded hole, the side of the coarse calibration device fixture base is equipped with a coarse adjustment knob screw, the coarse adjustment knob screw is provided with a second threaded hole at its own axial end, and the axis of the second threaded hole coincides with the axis of the coarse adjustment knob screw; a fine calibration device, comprising a fine calibration device fixture base, the top of the fine calibration device fixture base is provided with a third vertical threaded hole, the side of the fine calibration device fixture base is equipped with a fine rotating platform, the fine rotating platform is provided with a fourth threaded hole at its own axial end, and the axis of the fourth threaded hole coincides with the axis of the fine rotating platform; the first threaded hole and the third threaded hole are used to install a standard vibration sensor, the second threaded hole and the fourth threaded hole are used to install a calibrated vibration sensor, and the calibrated vibration sensor rotates synchronously with the coarse adjustment knob screw or the fine rotating platform; the coarse calibration device and the fine calibration device are placed on a vibration table.
[0006] The beneficial effect of adopting the above technical scheme is: in order to overcome the problems in the existing vibration sensor lateral sensitivity ratio calibration technology that the asymmetry when rotating around the sensitive axis and the low adjustment accuracy in the sensitive axis direction lead to large lateral sensitivity ratio test errors, the present invention provides a vibration sensor lateral sensitivity ratio automatic calibration device using a lateral fixture, including a coarse calibration device and a fine calibration device. The sensor to be calibrated is installed on the side of the device and the standard sensor is installed on the top of the device. Through a uniaxial vibration table test, a large lateral vibration ratio calibration acceleration is generated. The device can automatically find the direction of the maximum lateral vibration sensitivity and complete the automatic calibration of the lateral sensitivity ratio.
[0007] The utility model discloses a vibration sensor lateral sensitivity ratio automatic calibration device which excites the coarse and fine calibration devices by a uniaxial vibration excitation method to complete the calibration of the lateral sensitivity ratio of the vibration sensor, which effectively solves the defect that the lateral vibration ratio calibration acceleration is small; when the device is testing the lateral sensitivity ratio, the reference frequency point, the reference magnitude and the dwell time can be set according to the needs of the user; the device is easy to install, and can rotate 360° around the sensitive axis to automatically find the direction of the maximum lateral vibration sensitivity.
[0008] As a further improvement of the present invention, the coarse calibration device and the fine calibration device are respectively assembled with the vibration table, or the coarse calibration device and the fine calibration device are simultaneously assembled with the same vibration table.
[0009] As a further improvement of the present invention, the coarse calibration device fixture base and the fine calibration device fixture base are both composed of an integrated vertical plate and a horizontal bottom plate. The horizontal bottom plate is assembled with a vibration table through a circular array of screws, and the coarse adjustment knob screws, the fine rotating platform and the vertical plate are assembled.
[0010] The beneficial effect of adopting the above technical solution is that the integrated clamp base ensures the assembly area and stability.
[0011] As a further improvement of the utility model, the end of the coarse adjustment knob screw away from the second threaded hole has an external thread section passing through the vertical plate, and the external thread section is equipped with a fastening nut. The coarse adjustment knob screw and the fastening nut clamp a pair of opposite sides of the vertical plate itself.
[0012] The beneficial effect of adopting the above technical solution is that the coarse adjustment knob screw and the fastening nut can achieve tightness adjustment.
[0013] As a further improvement of the utility model, a rotation positioning adjustment platform is also installed on the vertical plate of the base of the fine calibration device fixture. The fine rotating platform is assembled with the rotation positioning adjustment platform. A fine adjustment angle knob is provided on the top of the rotation positioning adjustment platform itself. The fine adjustment angle knob drives the fine rotating platform to rotate through a worm gear mechanism. The fine rotating platform is provided with a circle of worm gear segments.
[0014] The beneficial effects of adopting the above technical solution are: the worm gear can achieve more precise rotation, and the fine calibration device does have better fine adjustment capabilities than the coarse calibration device.
[0015] As a further improvement of the present invention, the coarse adjustment knob screw, the fine rotation platform, and the fine adjustment angle knob are each provided with a circle of scale markings.
[0016] The beneficial effect of adopting the above technical solution is that it is convenient for personnel to perceive the actual angle of the knob, thereby evaluating the accuracy of the calibrated sensor.
[0017] As a further improvement of the utility model, a fifth threaded hole is further provided on one side of the rotary positioning adjustment platform, and the axes of the third threaded hole, the fourth threaded hole and the fifth threaded hole are perpendicular to each other.
[0018] The beneficial effect of adopting the above technical solution is: maintaining a mutually perpendicular relationship, thereby controlling the oblique variables.
[0019] As a further improvement of the utility model, the unit angle of each rotation of the coarse adjustment knob screw is 10°.
[0020] As a further improvement of the utility model, the rim annular array of the coarse adjustment knob screw has a plurality of radial notches.
[0021] The beneficial effect of adopting the above technical solution is that it is convenient for people to hold and adjust.
[0022] As a further improvement of the present invention, the first threaded hole, the second threaded hole, the third threaded hole, and the fourth threaded hole have the same inner diameter.
[0023] The beneficial effects of adopting the above technical solution are: unifying size specifications, facilitating processing, and improving versatility. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. It is obvious that the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0025] Figure 1 It is a three-dimensional diagram of an embodiment of the utility model;
[0026] Figure 2 It is a vertical cross-sectional view of a rough calibration device according to one embodiment of the utility model;
[0027] Figure 3It is a three-dimensional diagram of a fine rotating platform in one embodiment of the utility model;
[0028] Figure 4 It is an exploded view of a rough calibration device according to one embodiment of the utility model.
[0029] 1-coarse calibration device fixture base; 2-coarse adjustment knob screw; 3-fastening nut; 4-fine calibration device fixture base; 5-rotational positioning adjustment platform; 6-fine adjustment angle knob; 7-fine rotation platform; 8-vertical plate; 9-horizontal bottom plate; 10-first threaded hole; 11-second threaded hole; 12-third threaded hole; 13-fourth threaded hole; 14-external threaded section; 15-threaded matching hole; 16-worm gear section; 17-radial notch; 18-scale mark; 19-worm; 20-fifth threaded hole. DETAILED DESCRIPTION
[0030] The following is a further detailed description of the present invention in conjunction with specific embodiments:
[0031] In order to achieve the purpose of the utility model, a vibration sensor lateral sensitivity ratio calibration device includes: a coarse calibration device, including a coarse calibration device fixture base 1, the top of the coarse calibration device fixture base 1 is provided with a vertical first threaded hole 10, the side of the coarse calibration device fixture base 1 is equipped with a coarse adjustment knob screw 2, the coarse adjustment knob screw 2 is provided with a second threaded hole 11 at its own axial end, and the axis of the second threaded hole 11 coincides with the axis of the coarse adjustment knob screw 2; a fine calibration device, including a fine calibration device fixture base 4, the top of the fine calibration device fixture base 4 is provided with a vertical third threaded hole 12, the side of the fine calibration device fixture base 4 is equipped with a fine rotating platform 7, the fine rotating platform 7 is provided with a fourth threaded hole 13 at its own axial end, and the axis of the fourth threaded hole 13 coincides with the axis of the fine rotating platform 7; the first threaded hole 10 and the third threaded hole 11 are used to install a standard vibration sensor, the second threaded hole 13 and the fourth threaded hole 14 are used to install a calibrated vibration sensor, and the calibrated vibration sensor rotates synchronously with the coarse adjustment knob screw 2 or the fine rotating platform 7; the coarse calibration device and the fine calibration device are placed on a vibration table.
[0032] The beneficial effect of adopting the above technical scheme is: in order to overcome the errors in the lateral sensitivity ratio test caused by the asymmetry when rotating around the sensitive axis and the lack of precision in the adjustment in the direction of the sensitive axis in the prior art of the vibration sensor lateral sensitivity ratio calibration technology, the present invention provides an automatic lateral sensitivity ratio calibration device for a vibration sensor using a lateral clamp, including a coarse calibration device and a fine calibration device. The sensor to be calibrated is installed on the side of the device and the standard sensor is installed on the top of the device. Through the uniaxial vibration table test, a larger lateral vibration ratio calibration acceleration is generated. The device can automatically find the direction of the maximum lateral vibration sensitivity and complete the automatic calibration of the lateral sensitivity ratio.
[0033] The utility model discloses an automatic calibration device for the lateral sensitivity ratio of a vibration sensor, which excites the coarse and fine calibration devices by a uniaxial vibration excitation method, thereby completing the calibration of the lateral sensitivity ratio of the vibration sensor, and effectively solves the defect that the lateral vibration ratio calibration acceleration is small; when the device is testing the lateral sensitivity ratio, the reference frequency point, the reference magnitude and the dwell time can be set according to the needs of the user; the device is easy to install, and can rotate 360° around the sensitive axis to automatically find the direction of the maximum lateral vibration sensitivity.
[0034] In some other embodiments of the present invention, the coarse calibration device and the fine calibration device are respectively assembled with the vibration table, or the coarse calibration device and the fine calibration device are simultaneously assembled with the same vibration table.
[0035] In other embodiments of the present invention, the coarse calibration device fixture base 1 and the fine calibration device fixture base 4 are both composed of an integrated vertical plate 8 and a horizontal bottom plate 9. The horizontal bottom plate is assembled with a vibration table through a circular array of screws, and the coarse adjustment knob screw 2 and the fine rotating platform 7 are assembled with the vertical plate 8.
[0036] The beneficial effect of adopting the above technical solution is that the integrated clamp base ensures the assembly area and stability.
[0037] like Figure 2 As shown, in other embodiments of the present invention, the end of the coarse adjustment knob screw 2 away from the second threaded hole 11 has an external thread section 14 passing through the vertical plate 8, and the external thread section 14 is equipped with a fastening nut 3. The coarse adjustment knob screw 2 and the fastening nut 3 jointly clamp a pair of opposite sides of the vertical plate itself.
[0038] The fastening nut 3 is provided with a threaded assembly hole 15 assembled with the external thread section 14, and the threaded assembly hole 15 is a blind hole.
[0039] The beneficial effect of adopting the above technical solution is that the coarse adjustment knob screw and the fastening nut can achieve tightness adjustment.
[0040] In other embodiments of the present invention, a rotation positioning adjustment platform 5 is further mounted on the vertical plate 8 of the fine calibration device fixture base 4, a fine rotation platform 7 is mounted on the rotation positioning adjustment platform 5, and a fine adjustment angle knob 6 is provided on the top of the rotation positioning adjustment platform 5 itself, and the fine adjustment angle knob 6 drives the fine rotation platform 7 to rotate by a worm gear mechanism, such as Figure 3 As shown, the fine rotating platform 7 is provided with a circle of worm gear segments.
[0041] The fine angle adjustment knob 6 is integrally provided with a worm gear 19 .
[0042] The beneficial effects of adopting the above technical solution are: the worm gear can achieve more precise rotation, and the fine calibration device does have better fine adjustment capabilities than the coarse calibration device.
[0043] In other embodiments of the present invention, the coarse adjustment knob screw 2, the fine rotation platform 7, and the fine adjustment angle knob 6 are each provided with a circle of scale markings.
[0044] The beneficial effect of adopting the above technical solution is that it is convenient for personnel to perceive the actual angle of the knob, thereby evaluating the accuracy of the calibrated sensor.
[0045] like Figure 1 and Figure 4 As shown, in other embodiments of the present invention, a fifth threaded hole 20 is further provided on one side of the rotary positioning adjustment platform 5, and the axes of the third threaded hole 12, the fourth threaded hole 13, and the fifth threaded hole 20 are perpendicular to each other.
[0046] The beneficial effect of adopting the above technical solution is: maintaining a mutually perpendicular relationship, thereby controlling the oblique variables.
[0047] In other embodiments of the present invention, the unit angle of each rotation of the coarse adjustment knob screw 2 is 10°.
[0048] like Figure 1 As shown, in some other embodiments of the present invention, the rim annular array of the coarse adjustment knob screw 2 has a plurality of radial notches 17 .
[0049] The beneficial effect of adopting the above technical solution is that it is convenient for people to hold and adjust.
[0050] In some other embodiments of the present invention, the first threaded hole 10 , the second threaded hole 11 , the third threaded hole 12 , and the fourth threaded hole 13 have the same inner diameter.
[0051] The beneficial effects of adopting the above technical solution are: unifying size specifications, facilitating processing, and improving versatility.
[0052] The technical solution adopted by the utility model to solve the technical problem is: an automatic calibration device for the transverse sensitivity ratio of a vibration sensor, including a coarse calibration device and a fine calibration device, wherein the coarse calibration device and the fine calibration device base are respectively installed with a threaded knob adjustment device, wherein the threaded knob adjustment device of the coarse calibration device is a nut for the knob screw on the front side of the fixture and the fixing screw on the rear side, the knob screw on the front side is provided with a coarse angle scale, and the calibrated and standard vibration sensors are installed on the side and the top of the fixture. A fine knob adjustment platform is installed on the side of the fixture of the fine calibration device, and the calibrated and standard vibration sensors are installed on the fine knob adjustment platform and the top of the fixture, together forming a vibration sensor transverse sensitivity ratio calibration device.
[0053] The coarse calibration device includes a coarse adjustment knob screw 2 with a scale and a fastening nut 3 for coarse angle adjustment. The calibrated sensor is fixed through the threaded hole on the coarse adjustment knob screw 2.
[0054] The fine calibration device is a rotating positioning adjustment platform 5 , and the calibrated sensor is fixed through the threaded hole of the fine rotating platform 7 of the rotating positioning adjustment platform 5 .
[0055] The bases of the coarse calibration device and the fine calibration device are respectively mounted on the surface of the uniaxial standard vibration table by screws.
[0056] Embodiment 1
[0057] Automatic calibration device for lateral sensitivity ratio of vibration sensor includes Figure 1 The coarse calibration device and fine calibration device shown in the figure, the coarse calibration device includes a coarse calibration device fixture base 1, the bottom of the coarse calibration device fixture base 1 is provided with an opening for fixing, and the top is provided with a first threaded hole 10 for installing a standard vibration sensor, the coarse calibration device fixture base 1 is provided with a coarse adjustment knob screw 2 and a fastening nut 3, the shaft end of the coarse adjustment knob screw 2 is provided with a second threaded hole 11 for installing the calibrated vibration sensor, and after the coarse adjustment knob screw 2 is rotated to the set angle, it is fixed by the fastening nut 3.
[0058] The fine calibration device includes a fine calibration device fixture base 4, the bottom of the fine calibration device fixture base 4 is provided with an opening for fixing, the top is provided with a third threaded hole 12 for installing a standard vibration sensor, and a rotation positioning adjustment platform 5 is provided on the fine calibration device fixture base 4. The rotation positioning adjustment platform 5 rotates the fine rotating platform 7 to a set angle through a fine adjustment angle knob 6, and the fine rotating platform 7 is provided with a fourth threaded hole 13 for installing the calibrated vibration sensor.
[0059] Embodiment 2
[0060] The coarse calibration device and the fine calibration device can be installed separately on the standard vibration table to perform coarse and fine calibration of the lateral sensitivity ratio of the vibration sensor in turn. They can also be installed on the vibration table at the same time. When the device is calibrating the lateral sensitivity ratio, the reference frequency point, reference magnitude and dwell time can be set according to the user's needs.
[0061] Embodiment 3
[0062] The coarse calibration device and the fine calibration device are easy to install and can rotate 360° around the sensitive axis. The coarse adjustment knob screw 2 in the coarse calibration device can adjust the angle of 10° at a time around the sensitive axis to quickly find the direction of the maximum lateral vibration sensitivity; the fine adjustment angle knob 6 in the fine calibration device can adjust the angle of five minutes at a time around the sensitive axis.
[0063] When the utility model is working, the coarse calibration device fixture base 1 and the fine calibration device fixture base 4 are respectively fixed on the standard vibration table by screws. In the coarse calibration device, the calibrated vibration sensor is installed in the second threaded hole 11 at the shaft end of the coarse adjustment knob screw 2, the coarse adjustment knob screw 2 is fixed by the fastening nut 3, and the standard sensor is installed in the threaded hole at the top of the coarse calibration device fixture base 1; in the fine calibration device, the calibrated vibration sensor is installed in the fourth threaded hole 13 of the fine rotating platform 7, and the standard sensor is installed in the third threaded hole 12 at the top of the fine calibration device fixture base 4. When calibrating the lateral sensitivity ratio, after setting the reference frequency point, reference magnitude and dwell time of the standard vibration table, the coarse adjustment knob screw 2 and the fine adjustment angle knob 6 are respectively rotated around the sensitive axis, and calibration is performed at different angles to find the direction of the maximum lateral vibration sensitivity.
[0064] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.
Claims
1. A vibration sensor lateral sensitivity ratio calibration device, characterized in that: include: A coarse calibration device comprises a coarse calibration device fixture base, wherein the top of the coarse calibration device fixture base is provided with a vertical first threaded hole, a coarse adjustment knob screw is mounted on the side of the coarse calibration device fixture base, and the coarse adjustment knob screw is provided with a second threaded hole at its own axial end, and the axis of the second threaded hole coincides with the axis of the coarse adjustment knob screw; A fine calibration device, comprising a fine calibration device fixture base, wherein the top of the fine calibration device fixture base is provided with a third vertical threaded hole, a fine rotating platform is mounted on the side of the fine calibration device fixture base, and the fine rotating platform is provided with a fourth threaded hole at its own axial end, and the axis of the fourth threaded hole coincides with the axis of the fine rotating platform; The first threaded hole and the third threaded hole are used to install the vibration sensor, and the second threaded hole and the fourth threaded hole are used to install the calibrated vibration sensor, and the calibrated vibration sensor moves with the coarse adjustment knob screw or the fine rotating platform; The coarse calibration device and the fine calibration device are placed on a vibration table.
2. The vibration sensor lateral sensitivity ratio calibration device according to claim 1, characterized in that: The coarse calibration device and the fine calibration device are respectively assembled with the vibration table, or the coarse calibration device and the fine calibration device are assembled with the same vibration table at the same time.
3. The vibration sensor lateral sensitivity ratio calibration device according to claim 1, characterized in that: The coarse calibration device fixture base and the fine calibration device fixture base are both composed of an integrated vertical plate and a horizontal bottom plate. The horizontal bottom plate is assembled with a vibration table through a circular array of screws, and the coarse adjustment knob screw, fine rotating platform and vertical plate are assembled.
4. The vibration sensor lateral sensitivity ratio calibration device according to claim 3, characterized in that: The end of the coarse adjustment knob screw away from the second threaded hole is provided with an external thread section passing through the vertical plate, and the external thread section is equipped with a fastening nut. The coarse adjustment knob screw and the fastening nut clamp the two sides of the vertical plate.
5. The vibration sensor lateral sensitivity ratio calibration device according to claim 3, characterized in that: A rotation positioning adjustment platform is also installed on the vertical plate of the base of the fine calibration device fixture. The fine rotating platform is assembled with the rotation positioning adjustment platform. A fine adjustment angle knob is provided on the top of the rotation positioning adjustment platform itself. The fine adjustment angle knob drives the fine rotating platform to rotate through a worm gear mechanism. The fine rotating platform is provided with a circle of worm gear segments.
6. The vibration sensor lateral sensitivity ratio calibration device according to claim 5, characterized in that: The coarse adjustment knob screw, the fine rotation platform, and the fine adjustment angle knob are each provided with a circle of scale markings.
7. The vibration sensor lateral sensitivity ratio calibration device according to claim 5, characterized in that: A fifth threaded hole is also provided on one side of the rotation positioning adjustment platform, and the axes of the third threaded hole, the fourth threaded hole and the fifth threaded hole are perpendicular to each other.
8. The vibration sensor lateral sensitivity ratio calibration device according to claim 1, characterized in that: The unit angle of each rotation of the coarse adjustment knob screw is 10°.
9. The vibration sensor lateral sensitivity ratio calibration device according to claim 1, characterized in that: The coarse adjustment knob screw has a plurality of radial notches in an annular array on the rim.
10. The vibration sensor lateral sensitivity ratio calibration device according to claim 1, characterized in that: The first threaded hole, the second threaded hole, the third threaded hole, and the fourth threaded hole have the same inner diameter.