Magnetic field measurement device and magnetic field measurement method

Abstract

The invention provides a magnetic field measuring device and a magnetic field measuring method. The magnetic field measurement device comprises: m measurement assemblies configured to measure a specific physical quantity of a magnet to be measured, each measurement assembly comprising a first end and a second end opposite to each other; the first measuring table is arranged beside the first end, the first measuring table comprises a first measuring platform, and the first measuring platform is configured to move on the first measuring table; the second measuring table is arranged beside the second end, the second measuring table comprises a second measuring platform, and the second measuring platform is configured to move synchronously with the first measuring table on the second measuring table; the m first clamps are matched with the first end of each measuring assembly, and each first clamp is configured to fix the matched first end on the table top of the first measuring platform; and the m second clamps are matched with the second end of each measuring assembly, and each second clamp is configured to fix the matched second end on the table top of the second measuring platform.

Description

Technical Field

[0001] The invention relates to the field of magnetic field measurement of medical ion therapy accelerator magnets, and in particular to a magnetic field measurement device and a magnetic field measurement method. Background Art

[0002] In the field of medical ion therapy accelerators, accurate magnetic field measurement is the key to ensuring the stability of accelerator performance and improving treatment accuracy and effectiveness. The magnetic fields generated by various magnets in the accelerator need to be precisely controlled to ensure that the ion beam can be transmitted along the predetermined trajectory and ultimately accurately hit the target tissue. Therefore, magnetic field measurement plays a vital role in the design, manufacture, commissioning and maintenance of accelerators.

[0003] In practical applications, accelerator engineers often need to choose different measurement equipment and tools according to specific measurement requirements, which not only increases the complexity of operation, but also increases equipment costs and time costs. Summary of the invention

[0004] In view of this, the present invention provides a magnetic field measuring device and a magnetic field measuring method.

[0005] On the one hand, an embodiment of the present invention provides a magnetic field measurement device, including: m measurement components, each measurement component is configured to measure a specific physical quantity of a magnet to be measured, each measurement component includes a first end and a second end opposite to each other, and m is a positive integer greater than or equal to 1; a first measurement table, arranged next to the first end, the first measurement table includes a first measurement platform, and the first measurement platform is configured to move on the first measurement table; a second measurement table, arranged next to the second end, the second measurement table includes a second measurement platform, and the second measurement platform is configured to move synchronously with the first measurement platform on the second measurement table; m first clamps, matching with the first end of each measurement component, each first clamp is configured to fix the matching first end on the table top of the first measurement platform; m second clamps, matching with the second end of each measurement component, each second clamp is configured to fix the matching second end on the table top of the second measurement platform.

[0006] According to an embodiment of the present invention, either one of the first measuring platform and the second measuring platform includes: a base; a first translation platform, which is arranged on the base, the first translation platform includes a first moving block, and the first moving block is configured to move along a first direction on the first translation platform; a second translation platform, which is fixedly connected to the first moving block, the second translation platform includes a second moving block, and the second moving block is configured to move along a second direction on the second translation platform, and the second direction is perpendicular to the first direction; wherein the first measuring platform is fixedly connected to the second moving block of the first measuring platform, and the second measuring platform is fixedly connected to the second moving block of the second measuring platform.

[0007] According to an embodiment of the present invention, the first translation platform also includes: a first screw rod, connected to the first moving block, and the first screw rod is configured to drive the first moving block to move along the first direction when the first screw rod rotates; a first servo motor, connected to the first translation platform, and configured to drive the first screw rod to rotate.

[0008] According to an embodiment of the present invention, the second translation platform also includes: a second screw rod, connected to the second moving block, and the second screw rod is configured to drive the second moving block to move along the second direction when the second screw rod rotates; a second servo motor, connected to the second translation platform, and configured to drive the second screw rod to rotate.

[0009] According to an embodiment of the present invention, any one of the first measuring platform and the second measuring platform further includes: a bottom plate, which is arranged between the base and the first translation platform, and the bottom plate is fixedly connected to the first translation platform; a plurality of adjustment devices, which are distributed around the side wall of the bottom plate, and the plurality of adjustment devices are configured to adjust the relative position of the bottom plate on the base.

[0010] According to an embodiment of the present invention, each adjusting device includes: a fixing member fixed on the base, the fixing member includes a first threaded hole, the first threaded hole leads to the side wall of the base plate; a bolt movably connected to the first threaded hole and in contact with the side wall of the base plate, and the bolt is configured to push the side wall of the base plate to move.

[0011] According to an embodiment of the present invention, the measuring component includes an integral long coil, which is configured to measure at least one of the integral field, integral field uniformity, and discreteness of the magnet to be measured; either the first fixture or the second fixture includes: a long coil clamping mechanism, including a pressure plate, and the long coil clamping mechanism is configured to press the first end and the second end of the integral long coil onto the first measuring platform and the second measuring platform respectively through the pressure plate.

[0012] According to an embodiment of the present invention, the measuring component includes a rotating coil, which is configured to measure at least one of the magnetic field quality, high-order harmonic components, integral field, and magnetic center of the magnet to be measured; either the first fixture or the second fixture includes: a rotating coil clamping mechanism, which is configured to fix the first end and the second end of the rotating coil on the first measuring platform and the second measuring platform respectively through bearings.

[0013] According to an embodiment of the present invention, the measuring component includes a tension wire, which is configured to measure at least one of the integral field, the integral gradient, and the magnetic center of the magnet to be measured; either the first clamp or the second clamp includes: a tension wire clamping mechanism, including a wire drag, a wire clamp, a tension adjustment mechanism, and an adjustment track, the wire drag and the tension adjustment track are fixed on the first measuring platform and the second measuring platform, the wire clamp is fixed on the tension adjustment mechanism, the tension adjustment mechanism slides on the adjustment track, the wire drag is configured to lead out and align the tension wire, the wire clamp is configured to fix the tension wire, and the tension adjustment mechanism is configured to adjust the tension of the tension wire.

[0014] Another aspect of an embodiment of the present invention provides a magnetic field measurement method, comprising: placing a magnet to be measured between a first measuring platform and a second measuring platform of the above-mentioned magnetic field measurement device; adjusting the magnet to be measured and a first measuring platform of the first measuring platform and a second measuring platform of the second measuring platform to a target position, so that the measurement positions of the first measuring platform and the second measuring platform match the measured range of the magnet to be measured; fixing the first end and the second end of the measuring component on the first measuring platform and the second measuring platform respectively by a first clamp and a second clamp, and measuring the physical quantity to be measured of the magnet to be measured after aligning the measuring component.

[0015] According to the magnetic field measurement device and magnetic field measurement of the embodiments of the present invention, a multifunctional magnetic field measurement system is provided to increase the versatility and integration of the equipment, and replace the main functions of the integral long coil measurement system, the Hall point measurement system, the rotating coil measurement system, and the tension line measurement system with a set of measurement systems, thereby realizing multifunctional and multi-physical quantity measurement, meeting the magnetic field measurement requirements of most accelerator magnets, reducing the cost of purchasing measurement equipment required for multiple systems, and saving the space required for building multiple measurement systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and other objects, features and advantages of the present invention will become more apparent through the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

[0017] Figure 1 A schematic diagram of a magnetic field measuring device according to an embodiment of the present invention is shown;

[0018] Figure 2 Schematically shows a structural diagram of a measuring station according to an embodiment of the present invention;

[0019] Figure 3 A schematic diagram showing a structure of a magnetic field measuring device configured with an integral long coil according to an embodiment of the present invention;

[0020] Figure 4 A schematic diagram of a structure of an integral long coil measurement assembly according to an embodiment of the present invention is shown;

[0021] Figure 5 The structure diagram of the integral long coil according to an embodiment of the present invention is schematically shown;

[0022] Figure 6 A schematic diagram showing a structure of a magnetic field measuring device configured with a rotating coil according to an embodiment of the present invention;

[0023] Figure 7 A schematic diagram of a structure of a rotating coil measurement assembly according to an embodiment of the present invention is shown;

[0024] Figure 8 A schematic diagram showing a structure of a magnetic field measuring device configured with tension wires according to an embodiment of the present invention;

[0025] Fig. 9 A schematic diagram of a tension line measuring assembly according to an embodiment of the present invention is shown;

[0026] Fig.10 The flowchart of the magnetic field measurement method according to an embodiment of the present invention is schematically shown. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0028] It should be noted that in the drawings or descriptions, similar or identical parts use the same figure numbers. The technical features in the various embodiments exemplified in the specification can be freely combined to form new solutions without conflict. In addition, each claim can be used as an embodiment alone or the technical features in each claim can be combined as a new embodiment. In the drawings, the shape or thickness of the embodiment can be expanded and marked for simplification or convenience. Furthermore, the elements or implementations not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field.

[0029] Figure 1 The structure of a magnetic field measuring device according to an embodiment of the present invention is schematically shown.

[0030] like Figure 1As shown, the magnetic field measuring device 100 may include a first measuring table 110, a second measuring table 120, a first fixture 131, a second fixture 132 and a measuring assembly 140. The measuring assembly 140 is configured to measure a specific physical quantity of a magnet to be measured (not shown in the figure). The measuring assembly 140 includes a first end and a second end opposite to each other. The first measuring table 110 is arranged beside the first end, and the first measuring table 110 includes a first measuring platform 111, and the first measuring platform 111 is configured to move on the first measuring table 110; the second measuring table 120 is arranged beside the second end, and the second measuring table 120 includes a second measuring platform 121, and the second measuring platform 121 is configured to move synchronously with the first measuring platform on the second measuring table 120. The first fixture 131 matches the first end of the measuring assembly 140, and the first fixture 131 is configured to fix the first end on the table surface of the first measuring platform 111. The second fixture 132 matches the second end of the measuring assembly 140 , and the second fixture 132 is configured to fix the second end on the surface of the second measuring platform 121 .

[0031] The measuring component 140 can be determined by the physical quantity to be measured. For example, an integral long coil measuring component can be used to measure the integral field, integral field uniformity, discreteness and other physical quantities of the magnet to be measured, a rotating coil measuring component can be used to measure the magnetic field quality, high-order harmonic components, integral field, magnetic center and other physical quantities of the magnet to be measured, a tension line measuring component can be used to measure the integral field, integral gradient, magnetic center and other physical quantities of the magnet to be measured, and a Hall point measurement system can be used to measure the spatial magnetic field distribution of the magnet to be measured, thereby obtaining more comprehensive magnetic field parameters. The structures of different measuring components will be further introduced later.

[0032] The measurement methods such as integral long coil, rotating coil, tension wire, Hall point measurement are adapted to different scenarios, suitable for different magnet elements, and can measure different physical quantities. Their functions cannot replace each other. In the existing accelerator engineering measurement laboratory, a single measurement device usually has only a single function, and a set of devices is only adapted to one measurement method. In other words, the integral long coil, rotating coil, tension wire, and Hall point measurement require at least 4 different measurement devices to fully measure all. The magnetic field measurement device 100 of the embodiment of the present invention only needs to replace the measurement component 140 on the measurement platform 111, 121 to complete the conversion of the measurement method, which is simple and fast, has strong adaptability, and greatly reduces the waste of economic and space resources. The magnetic field measurement device 100 also provides fixtures 131 and 132 matching the measurement component 140, which can efficiently fix different measurement components 140 on the measurement platform 111, 121. The measurement platforms 111 and 121 can move synchronously on the measurement platforms 110 and 120, and the stability of the movement of the measurement component 140 can be ensured.

[0033] Figure 2 The structure of a measuring station according to an embodiment of the present invention is schematically shown.

[0034] The first measuring platform 110 and the second measuring platform 120 can adopt the same structure, which not only reduces the design and production costs, but also effectively ensures the synchronous movement of the first measuring platform 111 and the second measuring platform 121, thereby improving the interchangeability between the components in the measurement. Figure 2 As shown, the measurement stage 110 may include a base 113 , a first translation stage 116 , and a second translation stage 118 .

[0035] In some embodiments, the base 113 may be made of marble. The base 113 may be supported by a plurality of adjustable legs 112. For example, four adjustable legs 112 may be provided at the four corners of the measuring platform 110. A screw of a certain length may be provided on the upper portion of the adjustable legs 112 to cooperate with the screw hole at the lower end of the base 113. The height of each adjustable leg 112 may be adjusted by screwing in the screw, thereby adjusting the position of the measuring platform 110 in the vertical direction, so that the measuring platform 110 remains horizontal and stable.

[0036] The first translation stage 116 is disposed on the base 113, and includes a first moving block 117, and the first moving block 117 is configured to move along the first direction X on the first translation stage 116; the second translation stage 118 is fixedly connected to the first moving block 117, and includes a second moving block 119, and the second moving block 119 is configured to move along the second direction Y on the second translation stage 118. The second direction Y is perpendicular to the first direction X.

[0037] like Figure 2 As shown, the first measuring platform 111 is fixedly connected to the second moving block 119 of the first measuring platform 110. Figure 1 As shown, the second measuring platform 121 is fixedly connected to the second movable block of the second measuring platform. In this way, the first measuring platform 111 and the second measuring platform 121 can realize free movement in the first direction X and the second direction Y. The combination of the translation platforms 116 and 118 can realize scanning movement in the two-dimensional direction of space, and the measuring platforms 110 and 120 can realize high-precision synchronous scanning movement, which has strong practicality in magnetic field measurement work.

[0038] Please continue to refer to Figure 2In some embodiments, the first translation stage 116 may further include: a first screw (not shown in the figure) and a first servo motor 1161. The first screw is connected to the first moving block 117, and the first screw is configured to drive the first moving block 117 to move along the first direction X when the first screw rotates; the first servo motor 1161 is connected to the first translation stage 116 and is configured to drive the first screw to rotate. The motion accuracy of the first servo motor 1161 can be selected to be a higher value, and the repeatability positioning accuracy can preferably reach 5μm level. In this way, the first platform 116 can be accurately moved in the first direction X.

[0039] Please continue to refer to Figure 2 In some embodiments, the second translation stage 118 may further include: a second screw (not shown in the figure) and a second servo motor 1181. The second screw is connected to the second moving block 119, and the second screw is configured to drive the second moving block 119 to move along the second direction Y when the second screw rotates; the second servo motor 1181 is connected to the second translation stage 118 and is configured to drive the second screw to rotate. The motion accuracy of the second servo motor 1181 can be selected to be a higher value, and the repeat positioning accuracy can preferably reach the 5μm level. In this way, the second translation stage 118 can be accurately moved in the second direction Y.

[0040] Please continue to refer to Figure 2 In some embodiments, a bottom plate 115 may be disposed between the base 113 and the first translation stage 116, and the bottom plate 115 is fixedly connected to the first translation stage 116. The bottom plate 115 may be made of a flat stainless steel plate. The movement of the bottom plate 115 on the base 113 may be controlled by a plurality of adjustment devices 114. The plurality of adjustment devices 114 may be distributed around the side wall of the bottom plate 115, so as to adjust the relative position of the bottom plate 115 on the base 113.

[0041] In some embodiments, the adjustment device 114 may include a fixing member and a bolt. The fixing member is fixed to the base 113, and the fixing member includes a first threaded hole, and the first threaded hole leads to the side wall of the bottom plate; the bolt is movably connected to the first threaded hole and contacts the side wall of the bottom plate, and the bolt is configured to push the side wall of the bottom plate to move. By screwing in the bolt, the position of the adjustable bottom plate 115 is pushed to change; the adjustment bolt has a certain length and thus has a certain adjustment amount. As an example, two sets of adjustment devices 114 can be provided on both side walls of the base 113, so as to achieve the adjustment of the adjustable bottom plate 115 to any angle in a small range in the horizontal direction.

[0042] Figure 3 The structure diagram of the magnetic field measuring device configured with an integral long coil according to an embodiment of the present invention is schematically shown. Figure 4 The structure diagram of the integral long coil measurement assembly according to an embodiment of the present invention is schematically shown. Figure 5The structure of an integral long coil according to an embodiment of the present invention is schematically shown.

[0043] like Figure 3 As shown, the magnetic field measuring device 300 of this embodiment is equipped with an integral long coil 310. The integral long coil 310 can measure physical quantities such as the integral field, integral field uniformity, and discreteness of the magnet to be measured (not shown in the figure). The integral long coil 310 is fixed on the first measuring platform 110 and the second measuring platform 120 through a long coil clamping mechanism 320. The first measuring platform 110 and the second measuring platform 120 have been described above and will not be repeated here.

[0044] like Figure 4 As shown, the long coil clamping mechanism 320 may include a pressing plate 321. The long coil clamping mechanism 320 is configured to press the first end and the second end of the integral long coil 310 onto the first measurement platform 111 and the second measurement platform 121 respectively through the pressing plate 321. For example, the pressing may be performed by passing a bolt 322 through a threaded hole on the pressing plate 321. When the two measurement platforms 111 and 121 perform synchronous scanning motions, the integral long coil 310 also moves accordingly, thereby achieving measurement of the integral field uniformity.

[0045] like Figure 5 As shown, the integral long coil 310 can be a coil customized according to actual test requirements, and can have a straight structure. In some embodiments, the integral long coil 310 can also have an arc-shaped structure. The present invention does not limit the specific shape structure of the integral long coil 310. The structure of the integral long coil 310 can be composed of an internal coil and an external skeleton. The internal coil can be a multiple turns of wire wound into a specific shape and size, which is used to induce electromotive force and measure magnetic field; the external skeleton tightly wraps the coil to fix, protect, and assist in alignment installation.

[0046] Figure 6 The structure of a magnetic field measuring device configured with a rotating coil according to an embodiment of the present invention is schematically shown. Figure 7 The structure of a rotating coil measurement assembly according to an embodiment of the present invention is schematically shown.

[0047] like Figure 6 As shown, the magnetic field measuring device 600 of this embodiment is equipped with a rotating coil 610. The rotating coil 610 can measure the magnetic field quality, high-order harmonic components, integral field, magnetic center and other physical quantities of the magnet to be measured (not shown in the figure). The rotating coil 610 can be fixed on the first measuring platform 110 and the second measuring platform 120 by a rotating coil clamping mechanism 620. The first measuring platform 110 and the second measuring platform 120 have been described above and will not be repeated here.

[0048] like Figure 7As shown, the rotating coil clamping mechanism 620 can fix the first end and the second end of the rotating coil 610 on the first measuring platform 111 and the second measuring platform 121 respectively through the bearing 621. When the rotating coil clamping mechanism 620 clamps the rotating coil 610 through the bearing 621, it does not affect the rotation of the rotating coil 610, and firmly fixes the position of the rotating coil 610.

[0049] In this embodiment, the magnetic field measuring device 600 may further include a rotating device. The rotating device may include a servo motor 710, a motor fixing base 720, a coupling 730 and a rotating coil shaft 740. The servo motor 710 is the main body of the rotating device, the driving shaft of the servo motor 710 is in the horizontal direction, and the coupling 730 is installed at the end of the driving shaft, which can be connected to the rotating coil shaft 740. When the servo motor 710 rotates, it will also drive the rotating coil 610 to rotate.

[0050] The rotating coil 610 is a common measuring device in accelerator engineering. The rotating coil 610 structure can be composed of an internal coil, an external frame, etc. When in use, the rotating coil 610 generates an electromotive force through rotation, and various physical parameters are measured. The internal coil and the external frame have the same function as the integral long coil 310. The end bearing 621 plays the role of supporting the entire rotating coil 610, and enables the rotating coil 610 to rotate freely after being supported. The rotating coil shaft 740 is used to connect the servo motor 710 to provide the rotating coil 610 with rotational power, so as to achieve the measurement of the magnetic field quality, high-order harmonic components, integral field, magnetic center and other physical quantities of the magnet to be measured.

[0051] Figure 8 A schematic diagram showing a structure of a magnetic field measuring device configured with tension wires according to an embodiment of the present invention; Fig. 9 The structure of a tension line measuring assembly according to an embodiment of the present invention is schematically shown.

[0052] like Figure 8 As shown, the magnetic field measuring device 800 of this embodiment is equipped with a tension wire 810. The tension wire 810 can measure physical quantities such as the integral field, the integral gradient, and the magnetic center of the magnet to be measured (not shown in the figure). The tension wire 810 is fixed to the first measuring platform 110 and the second measuring platform 120 by a tension wire clamping mechanism 820. The first measuring platform 110 and the second measuring platform 120 have been described above and will not be repeated here.

[0053] The tension wire clamping mechanism 810 may include a wire drag 821, a wire clamp 822, a tension adjustment device 823, and an adjustment track 824. The configuration of the tension wire clamping mechanism 810 on the measuring platforms 110 and 120 is basically the same. The tension wire 810 is a tensioned metal wire, and both ends are fixed on the two measuring platforms 110 and 120 through the tension wire clamping mechanism 810; the tension wire 810 extends out through the wire drag 821, and the position of the wire drag 821 has a certain physical relationship with the position of the tension wire 810, which can be used to assist in aligning the tension wire 810; the wire clamp 822 is used to fix the tension wire 810 and is locked by winding the roller; the tension adjustment device 823 can slide continuously on the adjustment track 824 to adjust the tension of the tension wire 810, and can be locked by the knob at any time.

[0054] The measurement method of the tension wire 810 is to pass a tensioned metal wire through the aperture of the magnet to be measured, and fix it on the measuring platforms 111 and 121 at both ends respectively. When the measuring platforms 111 and 121 move synchronously, the tension wire 810 can be driven to scan in the magnetic field, and the electromotive force is induced. The electromotive force signal is collected and analyzed by the acquisition equipment, so as to quickly measure the required physical quantities such as integral field and integral gradient.

[0055] In addition to the above-mentioned measurement methods such as the integral long coil 310, the rotating coil 610, and the tension wire 810, the multifunctional measuring platforms 111 and 121 of the present invention are also suitable for the Hall point measurement system. For example, a long straight rod can be processed, one end of which is fixed on the measuring platform 111 or the measuring platform 112, and the other end is fixed with a Hall sensor. In this way, the Hall sensor can measure the spatial magnetic field distribution of the measured magnet under the drive of the translation stage, thereby obtaining more comprehensive magnetic field parameters.

[0056] The magnetic field measuring device of the above embodiment may be used to implement the magnetic field measuring method. Fig.10 The flowchart of the magnetic field measurement method according to an embodiment of the present invention is schematically shown.

[0057] like Fig.10 As shown, the magnetic field measurement method may include operations S1 to S3.

[0058] In operation S1 , a magnet to be measured is placed between a first measuring table and a second measuring table of a magnetic field measuring device.

[0059] In operation S2, the magnet to be measured and the first measuring platform of the first measuring platform and the second measuring platform of the second measuring platform are adjusted to target positions so that the measuring positions of the first measuring platform and the second measuring platform match the measuring range of the magnet to be measured.

[0060] In operation S3, the first end and the second end of the measuring component are fixed on the first measuring platform and the second measuring platform respectively by the first clamp and the second clamp, and the physical quantity to be measured of the magnet to be measured is measured after the measuring component is aligned.

[0061] As an example, the magnet to be measured and the measuring platform can be adjusted to a horizontal level with the aid of a laser tracker and the positions of the magnet to be measured and the measuring platform can be adjusted so that the measuring range of the measuring platform matches the measuring range of the magnet to be measured. For example, the center of the measuring range of the motion platform can be aligned with the center of the measuring range of the magnet to be measured, so that as long as the measuring range of the measuring platform is larger than the measuring range, all required positions can be measured.

[0062] Replace the corresponding measuring components according to the physical parameters to be measured, and start the test after the measuring probe is aligned.

[0063] When installing the integral long coil measurement component, the long coil can be passed through the air gap of the magnet to be measured and installed on the measurement platforms on both sides. The coil is aligned so that its equivalent central axis coincides with the equivalent central axis of the magnet. At this time, the horizontal and vertical translation stages are driven to make the coil scan the induced electromotive force in the magnetic field to be measured. The digital integrator is used to collect the electromotive force induced by the coil, and the physical quantities such as the integral field and integral field uniformity of the magnet are analyzed.

[0064] When installing the rotating coil measurement assembly, the rotating coil can be passed through the aperture of the magnet to be measured and installed on the measuring platforms at both ends. The coil is aligned so that its central axis coincides with the central axis of the magnet to be measured. The bearings at both ends of the coil are clamped with a fixing device so that the coil position remains unchanged and can rotate freely. Adjust the position of the rotating motor so that the coupling at the end of its output shaft is connected to the coil shaft. At this time, the coil can rotate under the drive of the rotating motor. During the test, the coil is rotated, and the electromotive force induced by the coil is collected using a digital integrator. The physical quantities such as the high-order harmonic components, magnetic field quality, magnetic center, and integral gradient of the magnet are analyzed.

[0065] When installing the tension wire measurement assembly, the tension wire can be passed through the aperture of the magnet to be measured and fixed on the measuring platforms at both ends. The tension applying device is adjusted to apply tension to the metal wire to make it tight. The tension wire is aligned by adjusting the position of the measuring platform to make it coincide with the central axis of the magnet to be measured. During measurement, the translation stages on both sides are driven to move synchronously and scanned in the air gap of the magnet to be measured. Electromotive force will be generated during the movement of the metal wire. The electromotive force is collected by a digital integrator and analyzed to obtain the magnetic center, integral field, integral gradient and other physical quantities of the magnet to be measured.

[0066] When installing the Hall point measurement assembly, the Hall sensor can be installed at the tip of the measuring rod according to the requirements of the magnetic field to be measured, the measuring rod is connected to the coupling of the rotating device, and the position of the measuring rod and the sensitive area of ​​the Hall plate are aligned and adjusted so that the trajectory of the Hall sensor driven by any translation stage alone is perpendicular to or coincides with the coordinate axis of the geometric coordinate system of the magnet to be measured. At this time, the Hall plate is driven to measure the spatial magnetic field distribution in the air gap of the magnet to be measured.

[0067] The details not included in the method embodiment section are similar to those in the device embodiment section. Please refer to the device embodiment section and will not be repeated here.

[0068] In summary, the magnetic field measurement device and magnetic field measurement method of the embodiments of the present invention have at least the following advantages:

[0069] (1) The multifunctional magnetic field measuring device and magnetic field measuring method of the present invention highly integrate the functions of the integral long coil system, the rotating coil system, the tension wire system, and the Hall point measuring system, so that a set of measuring systems can simultaneously meet the testing requirements of multiple magnets and multiple magnetic field parameters. The device and method have powerful functions, strong versatility, good practicality, and certain innovation.

[0070] (2) The present invention uses only one test system to replace the functions of multiple test systems, which simplifies the equipment, saves costs, avoids equipment redundancy and space waste, and is very suitable for promotion in accelerator measurement laboratories;

[0071] (3) For a variety of different test requirements, only the corresponding measuring components need to be replaced, which is quick and convenient. For the same measurement object, the manpower and time consumed in the process of transportation and re-alignment are avoided, thus improving the test efficiency.

[0072] (4) For magnets of different specifications and different testing requirements, the measurement system only needs to process measurement probes of corresponding specifications (such as integral long coils and rotating coils), and other devices and equipment can continue to be used. It has a certain degree of versatility and saves costs.

[0073] At this point, the magnetic field measuring device and magnetic field measuring method of the embodiment of the present invention are introduced. It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present invention. The attached method claims give the elements of various steps in an exemplary order and are not intended to be limited to a specific order or hierarchy.

[0074] It should also be noted that the directional terms mentioned in the embodiments, such as "upper", "lower", "front", "back", "left", "right", etc., are only reference directions of the drawings and are not intended to limit the scope of protection of the present invention. Throughout the drawings, the same elements are represented by the same or similar reference numerals. Conventional structures or constructions will be omitted when they may cause confusion in the understanding of the present invention. In addition, the shapes, sizes, and positional relationships of the components in the drawings do not reflect the actual sizes, proportions, and actual positional relationships.

[0075] In the above detailed description, various features are grouped together in a single embodiment to simplify the invention. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than those clearly stated in each claim. On the contrary, as reflected in the attached claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the attached claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. With respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. Any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

[0077] The above specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A magnetic field measuring device, characterized in that: include: m measuring components, each of which is configured to measure a specific physical quantity of the magnet to be measured, each of which comprises a first end and a second end opposite to each other, and m is a positive integer greater than or equal to 1; a first measuring station disposed beside the first end, the first measuring station comprising a first measuring platform configured to move on the first measuring station; a second measuring platform, disposed beside the second end, the second measuring platform comprising a second measuring platform, the second measuring platform being configured to move synchronously with the first measuring platform on the second measuring platform; m first fixtures, matched with the first end of each of the measuring components, each of the first fixtures being configured to fix the matched first end on the table of the first measuring platform; m second fixtures are matched with the second end of each of the measuring components, and each of the second fixtures is configured to fix the matched second end on the table of the second measuring platform.

2. The magnetic field measuring device according to claim 1, characterized in that: Either one of the first measurement station and the second measurement station comprises: Base; A first translation stage, disposed on the base, the first translation stage comprising a first moving block, the first moving block being configured to move along a first direction on the first translation stage; A second translation stage, fixedly connected to the first moving block, the second translation stage comprising a second moving block, the second moving block being configured to move along a second direction on the second translation stage, the second direction being perpendicular to the first direction; The first measuring platform is fixedly connected to the second moving block of the first measuring platform, and the second measuring platform is fixedly connected to the second moving block of the second measuring platform.

3. The magnetic field measuring device according to claim 2, characterized in that: The first translation stage further comprises: a first screw rod connected to the first moving block, wherein the first screw rod is configured to drive the first moving block to move along the first direction when the first screw rod rotates; The first servo motor is connected to the first translation stage and is configured to drive the first lead screw to rotate.

4. The magnetic field measuring device according to claim 2, characterized in that: The second translation stage further comprises: a second screw rod connected to the second moving block, wherein the second screw rod is configured to drive the second moving block to move along the second direction when the second screw rod rotates; The second servo motor is connected to the second translation stage and is configured to drive the second lead screw to rotate.

5. The magnetic field measuring device according to claim 2, characterized in that: Any one of the first measurement station and the second measurement station further includes: A bottom plate, disposed between the base and the first translation stage, the bottom plate being fixedly connected to the first translation stage; A plurality of adjustment devices are distributed around the side wall of the bottom plate, and the plurality of adjustment devices are configured to adjust the relative position of the bottom plate on the base.

6. The magnetic field measuring device according to claim 5, characterized in that: Each of the adjustment devices comprises: A fixing member fixed on the base, the fixing member comprising a first threaded hole, the first threaded hole leading to the side wall of the bottom plate; A bolt is movably connected to the first threaded hole and contacts the side wall of the bottom plate. The bolt is configured to push the side wall of the bottom plate to move.

7. The magnetic field measuring device according to claims 1 to 6, characterized in that: The measuring assembly comprises an integral long coil, and the integral long coil is configured to measure at least one of the integral field, the integral field uniformity, and the discreteness of the magnet to be measured; Either one of the first fixture and the second fixture comprises: The long coil clamping mechanism comprises a pressing plate, and the long coil clamping mechanism is configured to press the first end and the second end of the integral long coil onto the first measuring platform and the second measuring platform respectively through the pressing plate.

8. The magnetic field measuring device according to claims 1 to 6, characterized in that: The measuring assembly comprises a rotating coil, and the rotating coil is configured to measure at least one of the magnetic field quality, high-order harmonic components, integral field, and magnetic center of the magnet to be measured; Either one of the first fixture and the second fixture comprises: The rotating coil clamping mechanism is configured to fix the first end and the second end of the rotating coil on the first measuring platform and the second measuring platform respectively through bearings.

9. The magnetic field measuring device according to claims 1 to 6, characterized in that: The measuring assembly comprises a tension wire, and the tension wire is configured to measure at least one of an integral field, an integral gradient, and a magnetic center of the magnet to be measured; Either one of the first fixture and the second fixture comprises: The tension line clamping mechanism includes a line drag, a line clamp, a tension adjustment mechanism and an adjustment track, wherein the line drag and the adjustment track are fixed on the first measuring platform and the second measuring platform, the line clamp is fixed on the tension adjustment mechanism, and the tension adjustment mechanism slides on the adjustment track. The line drag is configured to lead out and align the tension line, the line clamp is configured to fix the tension line, and the tension adjustment mechanism is configured to adjust the tension of the tension line.

10. A magnetic field measurement method, characterized in that: include: Placing the magnet to be measured between the first measuring platform and the second measuring platform of the magnetic field measuring device according to any one of claims 1 to 9; Adjusting the magnet to be measured, the first measuring platform of the first measuring platform, and the second measuring platform of the second measuring platform to target positions, so that the measuring positions of the first measuring platform and the second measuring platform match the measured range of the magnet to be measured; The first end and the second end of the measuring component are fixed on the first measuring platform and the second measuring platform respectively by means of a first clamp and a second clamp, and the physical quantity to be measured of the magnet to be measured is measured after the measuring component is aligned.

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