Device for testing orthogonality and linearity of magnetometer

Abstract

The utility model relates to a magnetometer orthogonality and linearity testing device, which comprises a magnetometer clamp, a magnetic shielding cylinder, a constant current source and an upper computer, the magnetic shielding cylinder is respectively and electrically connected with the constant current source and the upper computer, and the constant current source is electrically connected with the upper computer; the magnetometer clamp comprises a base, a connecting plate, a rotating disc, a to-be-tested piece fixing device, a rotating shaft, a connecting shaft, a first bevel gear, a second bevel gear, an inner gear ring, a straight gear, a first non-magnetic motor and a second non-magnetic motor. The middle part of the base is rotationally connected with a turntable; a first non-magnetic motor and a second non-magnetic motor are mounted in the turntable; two connecting plates are vertically connected to the rotating disc, a rotating shaft is rotatably connected between the two connecting plates, and a to-be-tested piece fixing device is fixedly connected to the rotating shaft; the rotating shaft is connected with a first bevel gear, the output end of the first non-magnetic motor is connected with a connecting shaft, and the end of the connecting shaft is connected with a second bevel gear. An inner gear ring is fixed to the bottom of the base, and the output end of the second non-magnetic motor is connected with a straight gear.

Description

Technical Field

[0001] This utility model relates to the field of magnetometer testing technology, and in particular to a testing device for the orthogonality and linearity of a magnetometer. Background Technology

[0002] With the rapid development of commercial space technology and the dense deployment of low-Earth orbit satellite constellations, various sensors used on spacecraft are showing a trend towards mass production, standardization, and low cost. As a key component for spacecraft attitude measurement, magnetometers are widely used in missions such as spaceborne navigation and magnetic field detection due to their simple structure, low power consumption, and small size. In practical applications, to ensure the reliability and accuracy of magnetometers during on-orbit operation, rigorous performance testing must be conducted before delivery to verify whether they meet design requirements and mission specifications.

[0003] Before integration into the satellite platform, the magnetometer needs to undergo orthogonality and linearity tests in a geomagnetic field environment. Orthogonality testing verifies whether the orthogonality between the magnetometer's three axes meets design requirements, while linearity testing evaluates its linear response capability between output voltage and magnetic field strength. The accuracy of these tests directly affects the precision of on-orbit attitude calculations.

[0004] However, traditional magnetometer testing methods are primarily based on manual operation, involving manual rotation, manual reading of values, and manual calculation of errors. This results in large testing errors, poor data consistency, and low operational efficiency. While this method is suitable for small-batch, single-item product development testing, it struggles to meet the current urgent needs of commercial aerospace for large-scale, automated, and highly consistent product delivery.

[0005] In summary, existing technologies for testing the orthogonality and linearity of magnetometers suffer from problems such as large testing errors, low efficiency, heavy reliance on manual labor, and unsuitability for mass production.

[0006] The preceding description is intended to provide general background information and does not necessarily constitute prior art. Utility Model Content

[0007] The purpose of this invention is to provide a testing device for the orthogonality and linearity of a magnetometer, which effectively improves the testing accuracy and efficiency.

[0008] This utility model provides a testing device for the orthogonality and linearity of a magnetometer, including a magnetometer fixture, a magnetic shielding cylinder, a constant current source, and a host computer. The magnetometer fixture is placed in the magnetic shielding cylinder, which is electrically connected to both the constant current source and the host computer. The constant current source is electrically connected to the host computer. The magnetometer fixture includes a base, a connecting plate, a turntable, a test piece fixing device, a rotating shaft, a connecting shaft, a first bevel gear, a second bevel gear, an internal gear ring, a spur gear, a first non-magnetic motor, and a second non-magnetic motor. The turntable is rotatably connected to the center of the base, and the first non-magnetic motor and the second non-magnetic motor are installed inside the turntable. A magneto; two connecting plates are vertically connected to the top of the turntable, and the two connecting plates are arranged in parallel and spaced apart; a rotating shaft is rotatably connected between the two connecting plates, and a test piece fixing device is fixedly connected to the rotating shaft; one end of the rotating shaft passes through the connecting plate and is connected to the first bevel gear; the output end of the first non-magnetic motor is connected to the connecting shaft, and the end of the connecting shaft is connected to the second bevel gear, the first bevel gear and the second bevel gear meshing; an internal gear ring is fixed to the bottom of the base, and the output end of the second non-magnetic motor is connected to the spur gear, the spur gear and the internal gear ring meshing.

[0009] Using the above technical solution, during the testing process, the test piece is first fixed on the test piece fixing device; the first non-magnetic motor drives the connecting shaft to rotate, the connecting shaft drives the second bevel gear to rotate, the second bevel gear drives the first bevel gear to rotate, the first bevel gear drives the rotating shaft to rotate, thereby driving the test piece fixing device on the rotating shaft to rotate; the second non-magnetic motor drives the spur gear to rotate, the rotating spur gear will rotate around the internal gear ring, thereby driving the turntable to rotate, and driving the test piece fixing device above the turntable to rotate;

[0010] Furthermore, two raised platforms are provided on the inner wall of the magnetic shielding cylinder, and the two raised platforms are arranged symmetrically, with the magnetometer clamp placed on the raised platforms.

[0011] Furthermore, the device for fixing the test piece includes a placement plate, a locking block, and a screw; the placement plate is a cuboid with an open top and a hollow interior, and has oblong holes on both the front and back of the placement plate, with internal threads on the oblong holes that mate with the screw; the screw passes through the oblong holes, and the locking block is rotatably connected to the end of the screw.

[0012] Furthermore, two of the aforementioned screws are installed in the waist-shaped hole.

[0013] Furthermore, scale lines are provided on the circumference of the turntable on the upper part of the base.

[0014] Furthermore, a stabilizing plate is vertically connected to the connecting plate directly below the first bevel gear, and the stabilizing plate has a stabilizing hole through which the connecting shaft passes.

[0015] This invention relates to a magnetometer orthogonality and linearity testing device, which enables high-precision controllable rotation of the magnetometer in three-dimensional space, providing a physical basis for accurate testing of orthogonality and linearity. The first and second non-magnetic motors used for driving the magnetometer are non-magnetic, thus avoiding electromagnetic interference and ensuring the accuracy of magnetic field measurements. The testing device has a minimum resolution of 0.0129° and an angular position positioning error of less than or equal to ±1″ (arcsecond), significantly higher than traditional manual rotation or low-resolution stepper motor systems, significantly improving the sensitivity and accuracy of orthogonality testing. It features a reasonable layout, small footprint, and good compatibility. The testing process can be fully controlled by host computer software, including rotation angle setting, data acquisition, error calculation, and result output, reducing manual intervention and improving testing efficiency. This testing device comprehensively solves the problems of low accuracy, low efficiency, large errors, and poor repeatability in traditional magnetometer testing, addressing issues such as low accuracy, low efficiency, large errors, and poor repeatability in structural design, measurement methods, accuracy control, software support, and batch adaptation. Attached Figure Description

[0016] Figure 1 A schematic diagram of the planar structure of the testing device provided in an embodiment of this utility model.

[0017] Figure 2 for Figure 1 A schematic diagram of the magnetometer fixture of the testing device.

[0018] Figure 3 for Figure 1 A schematic diagram of the magnetometer fixture of the testing device from the bottom view.

[0019] Figure 4 for Figure 1 Another perspective structural diagram of the magnetometer fixture of the testing device.

[0020] Figure 5 for Figure 1 A front view schematic diagram of the magnetometer fixture of the testing device.

[0021] Figure 6 for Figure 1 A top view of the magnetometer fixture of the testing device.

[0022] Figure 7 for Figure 1 A schematic diagram of the combined structure of the magnetometer fixture and magnetic shielding cylinder in the testing device.

[0023] Figure 8 for Figure 1A front view schematic diagram of the combined magnetometer fixture and magnetic shielding cylinder of the testing device.

[0024] The reference numerals and components involved in the accompanying drawings are shown below:

[0025] 100. Magnetometer clamp; 110. Base; 111. Scale lines

[0026] 120, Connecting plate; 121, Stabilizing plate; 130, Turntable

[0027] 140. Test piece fixing device; 141. Placement tray; 142. Locking block

[0028] 143, Screw; 144, Waist-shaped hole; 150, Shaft

[0029] 160, connecting shaft 170, first bevel gear 180, second bevel gear

[0030] 190, Internal gear ring 191, Spur gear 200, Magnetic shielding cylinder

[0031] 210, raised platform 300, constant current source 400, host computer Detailed Implementation

[0032] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0033] The terms "first," "second," "third," "fourth," etc., used in the specification and claims of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0034] Example 1

[0035] Figure 1 This is a schematic diagram of the planar structure of the testing device provided in an embodiment of the present utility model. Figure 2 for Figure 1 A schematic diagram of the magnetometer fixture in the testing device. Figure 3 for Figure 1 A schematic diagram of the magnetometer fixture of the testing device from the bottom view. Figure 4 for Figure 1 Another structural schematic diagram of the magnetometer fixture of the testing device. Please refer to... Figure 1 , Figure 2 , Figure 3 , Figure 4The magnetometer orthogonality and linearity testing device provided in this embodiment includes a magnetometer fixture 100, a magnetic shielding cylinder 200, a constant current source 300, and a host computer 400. The magnetometer fixture 100 is placed in the magnetic shielding cylinder 200, which is electrically connected to both the constant current source 300 and the host computer 400. The constant current source 300 and the host computer 400 are also electrically connected. The magnetometer fixture 100 includes a base 110, a connecting plate 120, a turntable 130, a test piece fixing device 140, a rotating shaft 150, a connecting shaft 160, a first bevel gear 170, a second bevel gear 180, an internal gear ring 190, a spur gear 191, a first non-magnetic motor, and a second non-magnetic motor. The turntable 130 is rotatably connected to the center of the base 110, and the first non-magnetic motor (not shown in the figure) is installed inside the turntable 130. (Shown) and the second non-magnetic motor (not shown); two connecting plates 120 are vertically connected to the top of the turntable 130, and the two connecting plates 120 are arranged in parallel and spaced apart; the rotating shaft 150 is rotatably connected between the two connecting plates 120, and the test piece fixing device 140 is fixedly connected to the rotating shaft 150; one end of the rotating shaft 150 passes through the connecting plate 120 and is connected to the first bevel gear 170, the output end of the first non-magnetic motor is connected to the connecting shaft 160, and the end of the connecting shaft 160 is connected to the second bevel gear 180, the first bevel gear 170 and the second bevel gear 180 mesh; the internal gear ring 190 is fixed to the bottom of the base 110, the output end of the second non-magnetic motor is connected to the spur gear 191, and the spur gear 191 and the internal gear ring 190 mesh.

[0036] It should be noted that during the testing process, the test piece is first fixed on the test piece fixing device 140; the first non-magnetic motor drives the connecting shaft 160 to rotate, the connecting shaft 160 drives the second bevel gear 180 to rotate, the second bevel gear 180 drives the first bevel gear 170 to rotate, the first bevel gear 170 drives the rotating shaft 150 to rotate, thereby driving the test piece fixing device 140 on the rotating shaft 150 to rotate; the second non-magnetic motor drives the spur gear 191 to rotate, the rotating spur gear 191 will rotate around the internal gear ring 190, thereby driving the turntable 130 to rotate, and driving the test piece fixing device 140 above the turntable 130 to rotate;

[0037] This invention enables high-precision controllable rotation of a magnetometer in three-dimensional space, providing a physical basis for accurate testing of orthogonality and linearity. The first and second non-magnetic motors used for driving are non-magnetic motors, which can avoid electromagnetic interference and ensure the accuracy of magnetic field measurement.

[0038] The testing device of this invention has a minimum resolution of 0.0129° and an angular position positioning error of less than or equal to ±1″ arcsecond, which is far superior to traditional manual rotation or low-resolution stepper motor systems, significantly improving the sensitivity and accuracy of orthogonality testing. It features a reasonable layout, small footprint, and good compatibility. The entire testing process can be controlled by a host computer software, including rotation angle setting, data acquisition, error calculation, and result output, reducing manual intervention and improving testing efficiency. This testing device comprehensively solves the problems of low accuracy, low efficiency, large errors, and poor repeatability in traditional magnetometer testing, addressing issues such as low accuracy, low efficiency, large errors, and poor repeatability in structural design, measurement methods, accuracy control, software support, and batch adaptation.

[0039] Figure 7 for Figure 1 A schematic diagram of the combined structure of the magnetometer fixture and magnetic shielding cylinder in the testing device. Figure 8 for Figure 1 A front view schematic diagram of the magnetometer fixture and magnetic shielding cylinder combined in the testing device. Please refer to... Figure 7 , Figure 8 The present invention provides two raised platforms 210 on the inner wall of the magnetic shielding cylinder 200. The two raised platforms 210 are symmetrically arranged, and the magnetometer clamp 100 is placed on the raised platforms 210.

[0040] Figure 5 for Figure 1 A front view schematic diagram of the magnetometer fixture of the testing device. Figure 6 for Figure 1 A top view of the magnetometer fixture in the testing apparatus. Please refer to... Figure 4 , Figure 5 , Figure 6 The test piece fixing device 140 of this utility model includes a placement plate 141, a locking block 142, and a screw 143. The placement plate 141 is a cuboid with an open top and a hollow interior. There are oblong holes 144 on the front and back of the placement plate 141. The oblong holes 144 are provided with internal threads that cooperate with the screw 143. The screw 143 passes through the oblong holes 144, and the locking block 142 is rotatably connected to the end of the screw 143.

[0041] It should be noted that during use, the test piece is placed in the placement tray 141, and the rotating screw 143 locks the test piece in place via the locking block 142. The test piece fixing device 140 can stably install various types of magnetometers and achieves automatic positioning, rotation, and locking through the upper computer 400 control system, thereby improving testing efficiency.

[0042] Furthermore, two screws 143 are installed in the waist-shaped hole 144; a scale line 111 is provided on the circumference of the turntable 130 above the base 110; a stabilizing plate 121 is vertically connected to the connecting plate 120 directly below the first bevel gear 170, and the stabilizing plate 121 is provided with a stabilizing hole, through which the connecting shaft 160 passes; this further improves rotational stability.

[0043] As can be seen from the above description, the advantages of this utility model are:

[0044] This invention enables high-precision, controllable rotation of the magnetometer in three-dimensional space, providing a physical basis for accurate testing of orthogonality and linearity. The first and second non-magnetic motors used for driving the magnetometer are non-magnetic, thus avoiding electromagnetic interference and ensuring the accuracy of magnetic field measurements. The testing device of this invention has a minimum resolution of 0.0129° and an angular position positioning error of less than or equal to ±1″ (arcsecond), far exceeding that of traditional manual rotation or low-resolution stepper motor systems, significantly improving the sensitivity and accuracy of orthogonality testing. It features a reasonable layout, small footprint, and good compatibility. The testing process can be fully controlled by host computer software, including rotation angle setting, data acquisition, error calculation, and result output, reducing manual intervention and improving testing efficiency. This testing device comprehensively solves the problems of low accuracy, low efficiency, large errors, and poor repeatability in traditional magnetometer testing, addressing issues such as low precision, low efficiency, large errors, and poor repeatability in structural design, measurement methods, precision control, software support, and batch adaptation.

[0045] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A testing device for the orthogonality and linearity of a magnetometer, comprising a magnetometer fixture (100), a magnetic shielding cylinder (200), a constant current source (300), and a host computer (400), wherein the magnetometer fixture (100) is placed in the magnetic shielding cylinder (200), the magnetic shielding cylinder (200) is electrically connected to the constant current source (300) and the host computer (400), and the constant current source (300) and the host computer (400) are electrically connected; characterized in that, The magnetometer fixture (100) includes a base (110), a connecting plate (120), a turntable (130), a test piece fixing device (140), a rotating shaft (150), a connecting shaft (160), a first bevel gear (170), a second bevel gear (180), an internal gear ring (190), a spur gear (191), a first non-magnetic motor, and a second non-magnetic motor; The turntable (130) is rotatably connected to the middle of the base (110), and the first non-magnetic motor and the second non-magnetic motor are installed inside the turntable (130); two connecting plates (120) are vertically connected to the top of the turntable (130), and the two connecting plates (120) are arranged in parallel and spaced apart. The rotating shaft (150) is rotatably connected between the two connecting plates (120), and the test piece fixing device (140) is fixedly connected to the rotating shaft (150); One end of the rotating shaft (150) passes through the connecting plate (120) and is connected to the first bevel gear (170). The output end of the first non-magnetic motor is connected to the connecting shaft (160). The end of the connecting shaft (160) is connected to the second bevel gear (180). The first bevel gear (170) and the second bevel gear (180) mesh. The internal gear ring (190) is fixed at the bottom of the base (110), and the output end of the second non-magnetic motor is connected to the spur gear (191), which meshes with the internal gear ring (190).

2. The testing device for the orthogonality and linearity of a magnetometer according to claim 1, characterized in that, Two raised platforms (210) are provided on the inner wall of the magnetic shielding cylinder (200). The two raised platforms (210) are arranged symmetrically, and the magnetometer clamp (100) is placed on the raised platforms (210).

3. The testing device for the orthogonality and linearity of a magnetometer according to claim 1, characterized in that, The test piece fixing device (140) includes a placement tray (141), a locking block (142), and a screw (143); The placement plate (141) is a rectangular parallelepiped with an open top and a hollow interior. There are waist-shaped holes (144) on the front and back of the placement plate (141). The waist-shaped holes (144) are provided with internal threads that mate with the screw (143). The screw (143) passes through the waist-shaped holes (144), and the locking block (142) is rotatably connected to the end of the screw (143).

4. The testing device for the orthogonality and linearity of a magnetometer according to claim 3, characterized in that, Two screws (143) are installed in the waist-shaped hole (144).

5. The testing device for the orthogonality and linearity of a magnetometer according to claim 1, characterized in that, A scale line (111) is provided on the circumference of the turntable (130) above the base (110).

6. The testing device for the orthogonality and linearity of a magnetometer according to claim 1, characterized in that, A stabilizing plate (121) is vertically connected to the connecting plate (120) directly below the first bevel gear (170). The stabilizing plate (121) has a stabilizing hole, and the connecting shaft (160) passes through the stabilizing hole.

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