A method and device for measuring the beam output angle of an X-ray tube

Abstract

The present invention provides a method and device for measuring the beam output angle of an X-ray tube. The method includes: configuring a device for measuring the beam output angle of an X-ray tube; the device for measuring the beam output angle of an X-ray tube includes an equipment rack, a platform unit, a swing arm rotation unit, an X-ray detector, a main controller, and a control and processing computer; the swing arm rotation unit includes a swing arm base, a swing arm driving source, and a rotatable driving swing arm, and the focal point of the X-ray tube to be measured is located on the axis of rotation of the driving swing arm; the X-ray detector is installed on the driving swing arm and is aligned with the focal point of the X-ray tube to be measured; during the test, the rotation angle of the X-ray tube to be measured relative to its central axis is controlled according to the circumferential angle α, and the swing angle of the driving swing arm is controlled according to the axial angle β, obtaining the light intensity measurement of almost all angles of all the target areas of interest around the X-ray tube to be measured, and accurately obtaining the beam output angle according to the true light intensity distribution, improving the test accuracy of the beam output angle of the X-ray tube to be measured.

Description

Technical Field

[0001] The present invention relates to the technical field of X-ray tube measurement, and in particular to a method for measuring the beam emission angle of an X-ray tube and a device for measuring the beam emission angle of an X-ray tube. Background Art

[0002] An X-ray tube is a high-voltage and high-vacuum electronic device with an electron emitter, which is widely used in the fields of industry, medicine, and scientific instruments. Generally, an X-ray tube mainly includes a housing for providing a vacuum environment, a cathode assembly and an anode assembly that are both sealed and fixed to the housing. The cathode assembly includes an electron emitter, and the anode assembly includes an anode target. When the X-ray tube operates, electrons are emitted from the electron emitter and then accelerated by a high-voltage electric field of dozens or hundreds of kilovolts between the cathode assembly and the anode assembly to form an electron beam. The electron beam bombards the anode target to generate X-rays, and the X-rays pass through the window of the X-ray tube and are emitted at a certain angle.

[0003] The light intensity and distribution of an X-ray tube are the light intensity distributions on a spherical surface centered on the focus of the X-ray tube (i.e., the center of the anode target) with a certain distance from the focus as the radius. The light intensity magnitude and distribution of the X-rays emitted through the window of the X-ray tube, the beam emission angle (which refers to the coverage angle of the X-rays emitted from the window of the X-ray tube), and the light intensity on the back of the window of the X-ray tube are key parameters of the X-ray tube, which are of great significance for how to design and manufacture the X-ray tube, define the index parameters of the X-ray tube, and guide the user on how to use the X-ray tube.

[0004] Existing Technology 1: China's national standard GB / T 26833-2011 provides general technical conditions for industrial X-ray tubes for nondestructive testing instruments. Section 4.9 of it proposes a method for measuring the effective ray beam angle, specifically by using X-ray photons to expose a film and then developing the film to measure the shadow area. However, this method of using film sensitization has the disadvantages of low sensitivity to X-ray light intensity and insufficient resolution. Moreover, in today's development of digital X-ray detectors, this method cannot accurately give the specific light intensity value of the X-ray tube and cannot meet the requirements of the user. In addition, in this method, when the X-rays emitted from the focus of the X-ray tube reach the film, the spatial paths they experience are different, resulting in different attenuations of the X-rays by the spatial medium. Therefore, from the center of the film to the edge of the film, the attenuation of the actually received X-ray light intensity gradually increases, and the received light intensity is not the light intensity on the spherical distribution centered on the focus of the X-ray tube. The measured light intensity is not the true light intensity distribution of the X-ray tube, and the test accuracy is poor.

[0005] Prior Art 2: A Chinese invention patent application with the authorization announcement number CN113639671B discloses an angle detection device for an X-ray tube and its usage method. It has a first moving module, an oil tank, a focal point detector, and a second moving module. The first moving module is used to drive the X-ray tube to move in the Y direction and the Z direction, and obtain the positions of the X-ray tube in the Y direction and the Z direction. The oil tank is used to provide a working environment for the X-ray tube. The focal point detector is used to detect the X-ray focal point. The second moving module is used to drive the focal point detector to move in the X direction and the Z direction, and obtain the positions of the focal point detector in the X direction and the Z direction. In this way, the light intensity value and distribution of the X-ray tube can be measured, and then the beam angle can be calculated. However, in this angle detection device, the second moving module drives the focal point measuring instrument to move along the plane direction, and there is still a problem of inconsistent attenuation caused by the inconsistent paths experienced by the X-rays. Eventually, the measured light intensity distribution is not the true light intensity distribution of the X-ray tube. In addition, it is necessary to install the X-ray tube in the oil tank to provide a high-voltage insulation environment, so the X-ray tube needs to be cleaned before and after the test, resulting in additional consumption of test man-hours.

[0006] Prior Art 3: A Chinese invention patent application with the application publication number CN115774283A discloses an X-ray source dose distribution test method and system, which includes a dose tester, an xOy rotation and lifting platform, and a yOz rotation and telescopic arm. The dose tester is fixed at the end of the upper arm of the yOz rotation and telescopic arm. During the test, the X-ray source equipped with the X-ray tube is placed flat on the xOy rotation and lifting platform, and the X-ray exit window of the X-ray source faces upward. The dose tester fixed on the yOz rotation and telescopic arm is used to perform a rotational scan on the dose of the X-ray source to obtain the dose distribution of the X-ray source. However, since the X-ray tube is a component of the X-ray source and is completely fixed in the X-ray source, this test method and system are not convenient for measuring the light intensity on the back surface of the X-ray tube (the surface opposite to the window of the X-ray tube), so the shielding effectiveness of the anode cap design of the X-ray tube cannot be evaluated. In addition, when packaging into an X-ray source (a downstream product of the X-ray tube), work such as assembling, evacuating, injecting oil, and sealing the X-ray tube is required. If this method is used for angle measurement of the X-ray tube, there is a disadvantage of very low test efficiency. Summary of the Invention

[0007] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a method for measuring the beam angle of an X-ray tube, which can not only ensure the consistency of the paths experienced by the X-rays, but also conveniently obtain the light intensity on the back surface of the X-ray tube, so as to obtain the true light intensity distribution of the measured X-ray tube at almost all angles, and finally obtain an accurate beam angle.

[0008] To achieve the above object, the present invention provides a method for measuring the beam angle of an X-ray tube, the method for measuring the beam angle of an X-ray tube comprising the following steps:

[0009] S1. A device for measuring the beam angle of the X-ray tube is provided;

[0010] The device for measuring the beam angle of an X-ray tube comprises an equipment frame, a platform unit, a swing arm rotation unit, an X-ray detection system, a main controller, and a control and processing computer; the platform unit is installed on the equipment frame and is used to load the vertically placed X-ray tube to be measured; the swing arm rotation unit comprises a swing arm seat installed on the equipment frame, a swing arm driving source installed on the swing arm seat, and a driving swing arm rotatably installed on the swing arm seat around a horizontal axis, the swing arm driving source is transmission-connected to the driving swing arm and connected to the main controller, and the focus of the X-ray tube to be measured is located on the rotation axis of the driving swing arm; the X-ray detection system comprises a connected X-ray detection controller and an X-ray detector, the X-ray detector is installed on the driving swing arm and is aligned with the focus of the X-ray tube to be measured; the main controller and the X-ray detection controller are both connected to the control and processing computer;

[0011] S2. Install the X-ray tube to be tested on the platform unit;

[0012] S3, setting the spatial coordinate information of the light intensity of the X-ray tube to be measured;

[0013] The spatial coordinate information includes the spatial coordinate positions of several X-ray detectors relative to the focus of the X-ray tube under test, each of which includes a circumferential angle α and an axial angle β, wherein the circumferential angle α is determined by the rotation angle of the X-ray tube under test relative to its central axis, and the axial angle β is determined by the swing angle of the driving swing arm;

[0014] S4, driving the X-ray tube under test to work and starting the X-ray detection system;

[0015] S5, obtaining the light intensity spatial distribution within the set spatial coordinate information;

[0016] According to each spatial coordinate position in the spatial coordinate information, the rotation angle of the X-ray tube under test relative to its central axis is controlled according to the circumferential angle α of the spatial coordinate position, and the control and processing computer controls the operation of the swing arm driving source according to the axial angle β of the spatial coordinate position through the main controller to control the swing angle of the driving swing arm; the control and processing computer obtains the light intensity information of the X-ray tube under test collected by the X-ray detector at each spatial coordinate position; the control and processing computer forms the light intensity spatial distribution of the X-ray tube under test according to each spatial coordinate position and the corresponding light intensity information;

[0017] S6, obtaining the beam angle of the X-ray tube under test;

[0018] The control and processing computer processes the light intensity spatial distribution of the X-ray tube under test according to the set technical indicators, defines the circumferential angle α corresponding to the light intensity at the edge position that meets the set attenuation percentage relative to the zero point position as the circumferential beam-out angle of the X-ray tube under test, and defines the axial angle β corresponding to the light intensity at the edge position that meets the set attenuation percentage relative to the zero point position as the axial beam-out angle of the X-ray tube under test.

[0019] Further, the platform unit includes a slewing platform rotatably mounted on the equipment frame around a vertical axis, and a slewing drive source mounted on the equipment frame, the slewing drive source is transmission-connected to the slewing platform and connected to the main controller;

[0020] In step S5, the control and processing computer controls the operation of the rotary drive source according to the circumferential angle α of the spatial coordinate position through the main controller, thereby controlling the rotation angle of the X-ray tube under test relative to its central axis.

[0021] Furthermore, the three-axis coordinate system corresponding to the spatial coordinate position is: the focus of the X-ray tube under test is the origin of the three-axis coordinate system, the central axis of the X-ray tube under test is the Z-axis of the three-axis coordinate system, the rotation axis of the driving swing arm is the X-axis of the three-axis coordinate system, and the horizontal axis in the horizontal plane that is orthogonal to the rotation axis of the driving swing arm and passes through the focus of the X-ray tube under test is the Y-axis of the three-axis coordinate system.

[0022] Furthermore, in step S2, after the X-ray tube to be tested is installed, the driving swing arm is in a horizontal position, and the focus of the X-ray tube to be tested is directly facing the X-ray detector along the Y axis and is at the same height as the X-ray detector.

[0023] The present invention further provides a device for measuring the beam angle of an X-ray tube, the device for measuring the beam angle of an X-ray tube comprises an equipment frame, a platform unit, a swing arm rotation unit, an X-ray detection system, a main controller, and a control and processing computer;

[0024] The platform unit is installed on the equipment frame and is used to load the vertically placed X-ray tube to be tested;

[0025] The swing arm rotation unit comprises a swing arm seat mounted on the equipment frame, a swing arm driving source mounted on the swing arm seat, and a driving swing arm rotatably mounted on the swing arm seat around a horizontal axis, the swing arm driving source is transmission-connected to the driving swing arm and connected to the main controller, and the focus of the X-ray tube to be tested is located on the rotation axis of the driving swing arm;

[0026] The X-ray detection system comprises an X-ray detection controller and an X-ray detector connected to each other, wherein the X-ray detector is mounted on a driving swing arm and is aligned with the focus of the X-ray tube to be detected;

[0027] The main controller and the X-ray detection controller are both connected to the control and processing computer;

[0028] When the swing arm driving source drives the driving swing arm to swing around its rotation axis, the X-ray detector forms a spherical trajectory with the focus of the X-ray tube under test as the center and the distance between the X-ray detector and the focus of the X-ray tube under test as the radius.

[0029] Furthermore, the swing arm rotating unit also includes an air cooling unit installed on the swing arm seat, the swing arm seat is provided with an air cooling opening, and the air cooling unit faces the anode assembly of the X-ray tube to be tested through the air cooling opening.

[0030] Furthermore, the platform unit includes a rotating platform that can be rotatably mounted on the equipment frame around a vertical axis, and a rotating drive source mounted on the equipment frame. The rotating drive source is transmission-connected to the rotating platform and connected to the main controller. The rotating platform is used to load the X-ray tube to be tested.

[0031] Furthermore, the swing arm driving source and the rotation driving source are both motors.

[0032] Furthermore, the device for measuring the beam angle of the X-ray tube also includes a high-voltage insulating sleeve, a high-voltage electrode inserted into the high-voltage insulating sleeve, a low-voltage insulating sleeve fixed to the equipment frame, and a low-voltage electrode inserted into the low-voltage insulating sleeve;

[0033] The platform unit also includes a platform base fixed to the equipment frame, the rotary platform includes a first turntable rotatably mounted on the platform base, a high-voltage insulation platform fixed on the top surface of the first turntable, and a second turntable fixed on the top surface of the high-voltage insulation platform, and the rotary drive source is transmission-connected to the first turntable;

[0034] The platform base and the first turntable are both provided with insulating through holes for allowing the high-voltage insulating bushing to pass through, the top of the high-voltage insulating bushing is fixed in the high-voltage insulating platform, the top of the high-voltage electrode extends out of the high-voltage insulating bushing and is electrically connected to the second turntable, and the anode assembly of the X-ray tube to be tested is fixed on the top surface of the second turntable; when the X-ray tube to be tested is tested, the first turntable is at a low potential, and the second turntable is at a high potential;

[0035] The low-voltage insulating sleeve is arranged on the periphery of the platform unit, and the low-voltage electrode is used to be electrically connected to the cathode assembly of the X-ray tube to be tested.

[0036] Further, a fixing hole for accommodating a high-voltage insulating sleeve is provided in the high-voltage insulating platform, and the diameter of the insulating through-hole is larger than that of the fixing hole, so that a first insulating air gap is formed between the platform base and the high-voltage insulating sleeve, and between the first turntable and the high-voltage insulating sleeve.

[0037] Further, a stepped hole is provided on the top surface of the first turntable, and a platform fixing flange is provided on the periphery of the stepped hole. The high-voltage insulating platform is fixed to the platform fixing flange, and the stepped hole forms a second insulating air gap between the first turntable and the high-voltage insulating platform.

[0038] Further, several insulating platform protrusions are provided on both the top surface and the bottom surface of the high-voltage insulating platform, and the insulating platform protrusions make both the top surface and the bottom surface of the high-voltage insulating platform be corrugated surfaces; several of the insulating platform protrusions are in a concentric circular ring shape or a spiral shape, and the cross-section of the insulating platform protrusion is rectangular, triangular, trapezoidal or other cross-sectional shapes.

[0039] Further, the platform unit further includes an electrode joint fixed between the high-voltage insulating platform and the second turntable. A first joint protrusion protruding downward is provided on the bottom surface of the electrode joint, and a second joint protrusion protruding upward is provided on the top surface of the electrode joint. The top of the high-voltage electrode extends into the first joint protrusion and is in contact and cooperation with the first joint protrusion, and the second joint protrusion extends into the second turntable and is in contact and cooperation with the second turntable.

[0040] Further, the high-voltage insulating sleeve, the low-voltage insulating sleeve and the high-voltage insulating platform are all made of high-voltage insulating materials, and the high-voltage insulating materials include but are not limited to PEEK, G10, ceramics, etc.

[0041] Further, the equipment frame is provided with a horizontally extending installation platform, the swing arm seat is fixed on the top surface of the installation platform, and a platform opening part penetrating up and down is provided in the installation platform, and the platform opening part allows the driving swing arm to swing downward.

[0042] As described above, the method and device for measuring the beam output angle of an X-ray tube according to the present invention have the following beneficial effects.

[0043] When testing the X-ray tube under test in this application, the X-ray tube under test is vertically installed on the platform unit. By changing the rotation angle of the X-ray tube under test and driving the swing arm to drive the swing of the X-ray detector, the X-ray detector forms a spherical trajectory with the focus of the X-ray tube under test as the center of the circle and the distance between the X-ray detector and the focus of the X-ray tube under test as the radius, so as to measure the light intensity at different positions on this spherical surface (i.e., the target area corresponding to the set spatial coordinate information), and at the same time, it is also convenient to obtain the light intensity on the back of the window of the X-ray tube under test, thereby completing the light intensity measurement of almost all angles of all target areas of interest around the X-ray tube under test. During the test, the X-ray detector always aims at the focus of the X-ray tube under test and the distance from the focus of the X-ray tube under test remains unchanged. In this way, the path that the X-ray emitted from the window of the X-ray tube under test reaches the X-ray detector is the same, ensuring that the measured light intensity is the true light intensity distribution of the X-ray tube under test. Finally, this application can obtain the true light intensity distribution of almost all angles of all target areas of interest around the X-ray tube under test, and accurately obtain its beam exit angle according to the true light intensity distribution of the X-ray tube under test, improving the test accuracy of the beam exit angle of the X-ray tube under test. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of the X-ray tube under test in this application.

[0045] Figure 2 is Figure 1 sectional view of.

[0046] Figure 3 It is a schematic structural diagram of the first embodiment of the device for measuring the beam exit angle of the X-ray tube in this application.

[0047] Figure 4 and Figure 5 is Figure 3 structural schematic diagrams of the swing arm rotation unit in different perspectives in.

[0048] Figure 6 It is a schematic structural diagram of the second embodiment of the device for measuring the beam exit angle of the X-ray tube in this application.

[0049] Figure 7 is Figure 6 structural schematic diagram of the platform unit in.

[0050] Figure 8 is Figure 7 sectional view of.

[0051] Figure 9 is Figure 7 structural schematic diagrams of the platform base and the first turntable in.

[0052] Figure 10 isFigure 7 Schematic diagram of the structure of a medium-voltage and high-voltage insulation platform.

[0053] Figure 11 is Figure 10 sectional view of.

[0054] Figure 12 Schematic diagram of the light intensity spatial distribution curve and the beam output angle of the measured X-ray tube obtained in this application. Specific implementation manner

[0055] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0056] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention. Therefore, they do not have technical essential significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present invention can be implemented.

[0057] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected" to another element, it can be directly connected to the other element or can also be indirectly connected to the other element through an intermediate element.

[0058] In addition, the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those skilled in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by this application.

[0059] The present invention provides a method and device for measuring the beam output angle of an X-ray tube, which is used to measure the beam output angle of the X-ray tube. The X-ray tube to be measured is defined as the measured X-ray tube 40.

[0060] As Figure 1 and Figure 2 shown, the X-ray tube 40 to be measured includes a housing 41, a cathode assembly 42 hermetically fixed to one end of the housing 41, and an anode assembly 43 hermetically fixed to the other end of the housing 41. The housing 41 is used to provide a vacuum environment. The cathode assembly 42 includes an electron emitter, a grid, and a focusing electrode. The anode assembly 43 includes an anode cap 431, an anode target 432 fixed in the anode cap 431, and a window 433 installed in the anode target 432. When the X-ray tube 40 to be measured operates, electrons are emitted from the electron emitter and accelerated by a high-voltage electric field of dozens or hundreds of kilovolts between the cathode assembly 42 and the anode assembly 43 to form an electron beam. The electron beam bombards the anode target 432 to generate X-rays, and the X-rays are emitted at a certain angle through the window 433. The center of the anode target 432 in the X-ray tube 40 to be measured is the focus of the X-ray tube 40 to be measured.

[0061] The following provides a preferred embodiment of a device for measuring the beam angle of an X-ray tube and a method for measuring the beam angle of an X-ray tube.

[0062] Embodiment 1 of the device for measuring the beam angle of an X-ray tube: As Figure 3 shown, Embodiment 1 of the device for measuring the beam angle of an X-ray tube includes an equipment frame 10, a platform unit 20, a swing arm rotation unit 30, an X-ray detection system, a main controller, and a control and processing computer. Among them, the platform unit 20 is installed on the equipment frame 10, and the top of the platform unit 20 is used to load the X-ray tube 40 to be measured placed vertically. As Figure 4 and Figure 5As shown, the swing arm rotation unit 30 includes a swing arm seat 31 installed on the equipment frame 10, a swing arm driving source 32 installed on the swing arm seat 31, and a driving swing arm 33 rotatably installed on the swing arm seat 31 around a horizontal axis. The swing arm driving source 32 is in transmission connection with the driving swing arm 33. The swing arm driving source 32 is connected to the main controller. The focus of the X-ray tube 40 to be tested is located on the rotation axis of the driving swing arm 33. The X-ray detection system includes a connected X-ray detection controller and an X-ray detector 50. The X-ray detector 50 is installed on the driving swing arm 33 and is aligned with the focus of the X-ray tube 40 to be tested. The X-ray detection controller controls the operation of the X-ray detector 50 and can collect the light intensity of the X-ray emitted from the focus of the X-ray tube 40 to be tested. The main controller and the X-ray detection controller are both connected to the control and processing computer. When the control and processing computer controls the swing arm driving source 32 through the main controller to drive the driving swing arm 33 to swing around its rotation axis, the X-ray detector 50 forms a spherical track with a radius of R on a sphere with the focus of the X-ray tube 40 under test as the center and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 under test as the radius R; in this way, during the test process, the X-ray detector 50 always points to the focus of the X-ray tube 40 under test, and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 under test remains unchanged. By such a setting, the additional attenuation of the X-ray light intensity caused by the inconsistent path experienced by the X-ray is avoided, so that the present application can measure the real light intensity value without unexpected attenuation.

[0063] Embodiment 1 of the method for measuring the beam angle of an X-ray tube: Embodiment 1 of the method for measuring the beam angle of an X-ray tube includes the following steps.

[0064] A1. Embodiment 1 of the device for measuring the beam angle of an X-ray tube as described above.

[0065] A2. Define the three-axis coordinate system: Figure 3 As shown, the focus of the X-ray tube 40 to be tested is defined as the origin O of the three-axis coordinate system, the central axis of the X-ray tube 40 to be tested is defined as the Z axis of the three-axis coordinate system, the rotation axis of the driving swing arm 33 is defined as the X axis of the three-axis coordinate system, and the horizontal axis in the horizontal plane that is orthogonal to the rotation axis of the driving swing arm 33 and passes through the focus of the X-ray tube 40 to be tested is defined as the Y axis of the three-axis coordinate system. In the three-axis coordinate system, the positive direction of the Z axis is upward, the positive direction of the Y axis is toward the X-ray detector 50, and the positive direction of the X axis is the direction in which the driving swing arm 33 faces the X-ray tube 40 to be tested.

[0066] The spatial coordinate position of the X-ray detector 50 relative to the focus of the X-ray tube 40 under test is represented by a circumferential angle α and an axial angle β. The circumferential angle α is the rotation angle of the X-ray tube 40 under test around the Z axis (i.e., the central axis of the X-ray tube 40 under test), and the axial angle β is the swing angle of the driving swing arm 33.

[0067] For the circumferential angle α: The circumferential angle α is determined by the rotation angle of the X-ray tube 40 under test relative to its central axis. The circumferential angle α when the X-ray tube 40 under test faces the positive direction of the X-axis is the circumferential positive angle, and the circumferential angle α when the X-ray tube 40 under test faces the negative direction of the X-axis is the circumferential negative angle. When the window 433 of the X-ray tube 40 under test faces the negative direction of the Y-axis, the circumferential angle α is defined as 0°, which is the central position of the circumferential angle α distribution.

[0068] For the axial angle β: The axial angle β is determined by the swing angle when the driving swing arm 33 swings up and down. The axial angle β when the driving swing arm 33 swings upward relative to the Y-axis (i.e., towards the positive direction of the Z-axis) is the axial positive angle, and the axial angle β when the driving swing arm 33 swings downward relative to the Y-axis (i.e., towards the negative direction of the Z-axis) is the axial negative angle. When the window 433 of the X-ray tube 40 under test faces the X-ray detector 50 directly along the negative direction of the Y-axis, the axial angle β is defined as 0°, which is the central position of the axial angle β distribution. At this time, the driving swing arm 33 is located in the XOY horizontal plane.

[0069] A3. Vertically install the X-ray tube 40 under test on the platform unit 20. By changing the rotation angle of the X-ray tube 40 under test relative to the Z-axis and the up and down swing of the driving swing arm 33 driving the X-ray detector 50, the X-ray detector 50 can be in different spatial positions on the spherical surface with the focus of the X-ray tube 40 under test as the center of the circle and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 under test as the radius. The spatial coordinate position of the X-ray detector 50 is determined by the values of the circumferential angle α and the axial angle β, that is, (α, β). For example, when the X-ray detector 50 is in the position horizontally aligned with the focus of the X-ray tube 40 under test, the spatial coordinate position of the X-ray detector 50 is (0°, 0°); when the X-ray tube 40 under test is rotated counterclockwise by 1° around the Z-axis and the driving swing arm 33 remains stationary, the spatial coordinate position of the X-ray detector 50 is (1°, 0°).

[0070] A4. Zeroing the spatial coordinate position of the X-ray detector 50: After the X-ray tube 40 to be measured is installed, by adjusting the rotation angle of the X-ray tube 40 to be measured relative to the Z-axis, the swing angle of the driving swing arm 33, and the installation height of the X-ray tube 40 to be measured, make the driving swing arm 33 in a horizontal position, make the window 433 of the X-ray tube 40 to be measured face the negative Y-axis direction, and make the focus of the X-ray tube 40 to be measured at the same height as the X-ray detector 50. Then the X-ray detector 50 faces the focus of the X-ray tube 40 to be measured along the Y-axis, and the zero position of the spatial coordinate position of the X-ray detector 50 relative to the focus of the X-ray tube 40 to be measured is (0°, 0°). Preferably, the installation height of the X-ray tube 40 to be measured can be achieved by adjusting the height of the platform unit 20, such as replacing the platform unit 20 with different heights, or using a platform unit 20 with a height adjustment mechanism, so that when the X-ray tube 40 to be measured is installed and in the initial position, the focus center of the X-ray tube 40 to be measured, the rotation axis of the driving swing arm 33, and the central axis of the X-ray detector 50 are located at the same height position in the Z-axis direction.

[0071] A5. Setting the spatial coordinate information of the light intensity to be measured by the X-ray tube 40 in the control and processing computer: The spatial coordinate information includes the spatial coordinate positions (α, β) of several X-ray detectors 50 relative to the focus of the X-ray tube 40 to be measured, and the spatial coordinate information is the target area to be tested by the X-ray tube 40 to be measured. In the control and processing computer, a coordinate information table is compiled according to the different coordinates of the preset (α, β), and the coordinate information table is input to the main controller, such as the angle value information of different β corresponding to α = 0°, and the angle value information of different β corresponding to α = 1°.

[0072] A6. Setting the working power-on value of the X-ray tube 40 to be measured in the control and processing computer, driving the X-ray tube 40 to work, and starting the X-ray detection system. Then the X-ray detector 50 starts to collect the light intensity of the X-rays emitted from the window 433 of the X-ray tube 40 to be measured, and the control and processing computer controls the X-ray detection controller to collect the X-ray light intensity data fed back by the X-ray detector 50 at a certain frequency.

[0073] A7. Obtain the spatial distribution of light intensity within the set spatial coordinate information: According to each spatial coordinate position within the spatial coordinate information, control the rotation angle of the X-ray tube 40 to be measured relative to the Z-axis according to the circumferential angle α of the spatial coordinate position. The control and processing computer controls the operation of the swing arm driving source 32 through the main controller according to the axial angle β of the spatial coordinate position, and controls the swing angle of the swing arm 33, thereby enabling the spatial coordinate position of the X-ray detector 50 relative to the focal point of the X-ray tube 40 to be measured to reach the specified position (α, β); thereafter, maintain at this spatial coordinate position for a set time, that is, temporarily stay at this spatial coordinate position. The control and processing computer reads the light intensity values of the X-ray tube 40 to be measured collected continuously multiple times at each spatial coordinate position by the X-ray detector 50, and obtains the average value as the light intensity information of this spatial coordinate position, and stores this light intensity information. After the light intensity information collection of one spatial coordinate position is completed, change the rotation angle of the X-ray tube 40 to be measured relative to the Z-axis and / or the swing angle of the swing arm 33 according to the coordinate information table, so that the spatial coordinate position of the X-ray detector 50 relative to the focal point of the X-ray tube 40 to be measured reaches the next spatial coordinate position. The control and processing computer collects and stores the X-ray light intensity information at this spatial coordinate position. Repeat this cycle until the X-ray light intensity information at all spatial coordinate positions is collected and stored.

[0074] A8. Processing of light intensity information: The control and processing computer processes the light intensity information corresponding to each spatial coordinate position to form the spatial distribution of light intensity of the X-ray tube 40 to be measured, such as forming a light intensity spatial distribution curve as shown in Figure 12 or forming a light intensity spatial distribution surface.

[0075] A9. Obtain the beam output angle of the X-ray tube 40 to be measured (including the circumferential beam output angle and the axial beam output angle): The control and processing computer processes the spatial distribution of light intensity of the X-ray tube 40 to be measured according to the set technical indicators, and defines the circumferential angle α corresponding to the light intensity at the edge position where the light intensity relative to the zero point position satisfies the set attenuation percentage as the circumferential beam output angle of the X-ray tube 40 to be measured, and defines the axial angle β corresponding to the light intensity at the edge position where the light intensity relative to the zero point position satisfies the set attenuation percentage as the axial beam output angle of the X-ray tube 40 to be measured. The technical indicators are formulated by the design manufacturer of the X-ray tube 40 to be measured and / or the demand side (i.e., the design manufacturer of the X-ray source), or specified according to the update level of subsequent standards. Usually, the circumferential beam output angle refers to the circumferential angle α corresponding to the light intensity at the edge position where the light intensity relative to the zero point position satisfies the set attenuation percentage when the axial angle β is 0°, and the axial beam output angle refers to the axial angle β corresponding to the light intensity at the edge position where the light intensity relative to the zero point position satisfies the set attenuation percentage when the circumferential angle α is 0°. For example, Figure 12The light intensity spatial distribution curve of the X-ray tube 40 under test as shown presents the light intensity of X-rays corresponding to different circumferential angles α when the axial angle β is 0°. When the circumferential angle α is 0°, the light intensity value of the X-rays is the maximum. According to the requirements of the technical specifications, the position where the light intensity is attenuated by 75% relative to the maximum light intensity corresponding to the zero point position is defined as the circumferential beam output angle of the X-ray tube 40 under test. Then, the circumferential beam output angle of the X-ray tube 40 under test is 80°. Of course, according to the needs, the circumferential angle α corresponding to the light intensity at the edge position where the light intensity satisfies the set attenuation percentage relative to the zero point position when the axial angle β is other angles can also be defined as the circumferential beam output angle, and the axial angle β corresponding to the light intensity at the edge position where the light intensity satisfies the set attenuation percentage relative to the zero point position when the circumferential angle α is other angles can be defined as the axial beam output angle. Based on the X-ray detector 50, a spherical trajectory with the focus of the X-ray tube 40 under test as the center and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 under test as the radius R is formed. The present application can measure the light intensity and the beam output angle of all the target regions of interest around the X-ray tube 40 under test. Even more, it can obtain the beam output angles formed by multiple combinations of the circumferential angle α and the axial angle β at different circumferential and axial positions. Or rather, the beam output angle of the X-ray tube 40 under test is a spatial distribution of light intensity composed of numerous circumferential positions and axial positions.

[0076] Further, when it is necessary to obtain the light intensity information at other spatial coordinate positions with nearly full angles, a coordinate information table needs to be established. For example, several different angle values of α corresponding to β = 1°, and several different angle values of α corresponding to β = 2°. Through similar settings, a coordinate information table of different circumferential angles α and axial angles β is established, and then through the above steps A6 to A9, the light intensity distribution with nearly full angles can be completed.

[0077] In summary, when testing the X-ray tube 40 to be measured in this application, the X-ray tube 40 to be measured is vertically installed on the platform unit 20. By changing the rotation angle of the X-ray tube 40 to be measured and driving the swing arm 33 to drive the swing of the X-ray detector 50, the X-ray detector 50 forms a circular or arc trajectory on the spherical surface with the focus of the X-ray tube 40 to be measured as the center of the circle and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 to be measured as the radius, so as to measure the light intensity at different positions on this spherical surface (i.e., the target area corresponding to the set spatial coordinate information). At the same time, it is also convenient to obtain the light intensity on the back of the window 433 of the X-ray tube 40 to be measured, so as to complete the light intensity measurement of almost all the target areas of interest around the X-ray tube 40 to be measured at nearly all angles. During the test, the X-ray detector 50 always aligns with the focus of the X-ray tube 40 to be measured and the distance from the focus of the X-ray tube 40 to be measured remains unchanged. In this way, the path that the X-ray emitted from the window 433 of the X-ray tube 40 to be measured reaches the X-ray detector 50 is the same, ensuring that the measured light intensity is the true light intensity distribution of the X-ray tube 40 to be measured. Finally, this application can conveniently and quickly obtain the true light intensity distribution of almost all angles of the X-ray tube 40 to be measured, and the light intensity distribution can be digitally measured, and the beam exit angle can be accurately obtained according to the true light intensity distribution of the X-ray tube 40 to be measured, improving the test accuracy of the beam exit angle of the X-ray tube 40 to be measured.

[0078] Further, in the first embodiment of the device for measuring the beam exit angle of an X-ray tube, as Figure 3 shown, the equipment frame 10 includes a support frame 103 and a mounting platform 101 fixed on the top of the support frame 103; the lower end of the support frame 103 can be configured with anchor bolts or can be configured with castor wheels with brakes; the mounting platform 101 extends horizontally, and the mounting platform 101 is used to provide a mounting reference, and the swing arm rotation unit 30 and the platform unit 20 are both mounted on the mounting platform 101. As Figure 3 shown, the swing arm base 31 is fixed on the top surface of the mounting platform 101, and a platform opening 102 that penetrates up and down is provided in the mounting platform 101. The platform opening 102 allows the driving swing arm 33 to swing downward, providing a swinging space for the driving swing arm 33 to swing downward. The platform unit 20 is a fixed structure, including a fixed platform 210 fixed on the top surface of the mounting platform 101; during the test, according to the preset circumferential angle α, the X-ray tube 40 to be measured is manually disassembled and assembled on the fixed platform 210 to adjust the rotation angle of the X-ray tube 40 to be measured relative to the Z axis.

[0079] Further, in the first embodiment of the device for measuring the beam exit angle of an X-ray tube, as Figure 4 and Figure 5As shown, the swing arm seat 31 is provided with a reinforcing rib 36 to improve the structural strength. The swing arm rotating unit 30 also includes a swing arm rotating mechanism 37. The swing arm driving source 32 is a motor, such as a stepping motor or a servo motor. The motor shaft of the swing arm driving source 32 is connected to one end of the driving swing arm 33 through the swing arm rotating mechanism 37, and the X-ray detector 50 is fixed to the other end of the driving swing arm 33. In this way, when the control and processing computer controls the swing arm driving source 32 to move through the main controller, the swing arm rotating mechanism 37 drives the driving swing arm 33 to swing up or down around the X-axis in the YOZ plane, forming a spherical trajectory with a radius of R, so that the X-ray detector 50 reaches the position corresponding to the specified axial angle β. Preferably, the driving swing arm 33 is a bending structure in its extension direction, so that the X-ray detector 50 at its end is aligned with the focus of the X-ray tube 40 to be measured.

[0080] Furthermore, if Figure 4 and Figure 5 As shown, the swing arm rotation unit 30 also includes an air cooling unit 34 installed on the swing arm seat 31. The swing arm seat 31 is provided with an air cooling opening 35 that passes through along the X-axis. The air cooling unit 34 faces the anode assembly 43 of the X-ray tube 40 under test through the air cooling opening 35, and the air cooling unit 34 and the X-ray tube 40 under test are separated by a certain distance in the air. During the test, the air cooling unit 34 dissipates heat for the X-ray tube 40 under test to prevent the X-ray tube 40 under test from being damaged due to heat accumulation during the test.

[0081] Furthermore, if Figure 3 As shown, the first embodiment of the device for measuring the beam angle of an X-ray tube further includes a control box 104 , in which a main controller is installed. The control box 104 is fixed to a support frame 103 and is disposed below the mounting platform 101 .

[0082] Embodiment 2 of the device for measuring the beam angle of an X-ray tube: Embodiment 2 of the device for measuring the beam angle of an X-ray tube is different from Embodiment 1 only in that the structure of the platform unit 20 is different. Specifically, Figures 6 to 8 As shown, in the second embodiment of the device for measuring the beam angle of an X-ray tube, the platform unit 20 includes a swivel platform that can be rotatably mounted on the equipment frame 10 around the Z axis, and a swivel drive source 21 mounted on the equipment frame 10, the swivel drive source 21 is connected to the swivel platform in a transmission manner, and the swivel platform is used to load the X-ray tube 40 to be tested; the swivel drive source 21 is connected to the main controller, and the swivel drive source 21 is a motor, such as a stepper motor or a servo motor. In this way, when the second embodiment of the device for measuring the beam angle of an X-ray tube is used for testing, the rotation angle of the X-ray tube 40 to be tested relative to the Z axis is automatically adjusted: the control and processing computer controls the operation of the swivel drive source 21 according to the circumferential angle α of the spatial coordinate position through the main controller, and controls the rotation angle of the X-ray tube 40 to be tested relative to the Z axis, which is more convenient and quick.

[0083] Further, as Figure 6 shown, the second embodiment of the device for measuring the beam exit angle of the X-ray tube further includes a high-voltage generating system, a high-voltage insulating sleeve 60, a high-voltage electrode 70 disposed in the high-voltage insulating sleeve 60, a low-voltage insulating sleeve 80 fixed to the mounting platform 101, and a low-voltage electrode disposed in the low-voltage insulating sleeve 80. The high-voltage electrode 70 is connected to the anode assembly 43 of the X-ray tube 40 to be measured to provide a high-voltage potential to the anode assembly 43, and the low-voltage electrode is connected to the cathode assembly 42 of the X-ray tube 40 to provide a low-voltage potential to the cathode assembly 42. The high-voltage generating system is connected to the high-voltage electrode 70 and the low-voltage electrode to operate the X-ray tube 40 to be measured to generate X-rays. When the X-ray tube 40 to be measured is fixed on the rotary platform, either its anode assembly 43 can be fixed to the rotary platform or its cathode assembly 42 can be fixed to the rotary platform. Preferably, Figure 6 in the shown embodiment, the anode assembly 43 of the X-ray tube 40 to be measured is fixed to the rotary platform. Based on this, the platform unit 20 further includes a platform base 22 fixed on the top surface of the mounting platform 101. The rotary platform includes a first rotary table 23 rotatably mounted on the platform base 22, a high-voltage insulating platform 24 fixed on the top surface of the first rotary table 23, and a second rotary table 25 fixed on the top surface of the high-voltage insulating platform 24. The rotary driving source 21 is in transmission connection with the first rotary table 23. Insulating through holes 26 allowing the high-voltage insulating sleeve 60 to pass through are formed in both the platform base 22 and the first rotary table 23. The insulating through holes 26 are through-hole structures that penetrate up and down. The top of the high-voltage insulating sleeve 60 is fixed in the high-voltage insulating platform 24. The top of the high-voltage electrode 70 extends out of the high-voltage insulating sleeve 60 and is disposed in the high-voltage insulating platform 24 and is electrically connected to the second rotary table 25. The anode assembly 43 of the X-ray tube 40 to be measured is fixed on the top surface of the second rotary table 25. The high-voltage insulating sleeve 60 is used for high-voltage insulation between the high-voltage electrode 70 and the platform base 22, the first rotary table 23, and the rotary driving source 21.

[0084] When the X-ray tube 40 under test is being tested, under the drive of the rotary drive source 21, the first rotary table 23, the high-voltage insulating sleeve 60, the second rotary table 25 and the X-ray tube 40 under test rotate together around the Z-axis in the XOY plane with the Z-axis as the axis. During the test, the first rotary table 23 is at a low potential, such as ground potential; the high-voltage electrode 70 provides a high-voltage potential to the second rotary table 25, making the second rotary table 25 at a high potential, such as dozens of kV or up to hundreds of kV higher, so as to provide a high-voltage potential to the anode assembly 43 of the X-ray tube 40 under test; that is to say, the X-ray tube 40 under test is in a single-ended working mode with anode high voltage and cathode grounded, so there is no need to consider the insulation between the low-voltage electrode and the surrounding metal components. At the same time, the high-voltage insulating sleeve 60 is separated between the low potential of the first rotary table 23 and the high potential of the second rotary table 25, providing high-voltage insulation to prevent high-voltage arcing during the test. In addition, as Figure 6 shown, the low-voltage insulating sleeve 80 is arranged on the periphery of the platform unit 20 to restrict the lead position of the low-voltage electrode and prevent arcing between the low-voltage electrode and the components at high voltage (such as the second rotary table 25, the high-voltage electrode 70).

[0085] Preferably, during the test, when the X-ray tube 40 under test is fixed on the second rotary table 25, by adjusting the height of the second rotary table 25, the focal center of the X-ray tube 40 under test and the rotation axis of the driving swing arm 33 are located at the same height position in the Z-axis direction. The height adjustment of the second rotary table 25 can be achieved by selecting a second rotary table 25 with different heights or by using a second rotary table 25 with a height adjustment mechanism. In this way, when the driving swing arm 33 is in a horizontal position, the focal center of the X-ray tube 40 under test, the rotation axis of the driving swing arm 33, and the central axis of the X-ray detector 50 are on the same XOY horizontal plane.

[0086] Furthermore, as Figure 8 , Figure 10 and Figure 11 shown, a fixing hole 241 for accommodating the high-voltage insulating sleeve 60 is provided in the high-voltage insulating platform 24, and the aperture of the insulating through hole 26 is significantly larger than the aperture of the fixing hole 241, so that a first insulating air gap 27 is formed between the platform base 22 and the high-voltage insulating sleeve 60, and between the first rotary table 23 and the high-voltage insulating sleeve 60. Then the high-voltage electrode 70 is insulated through the high-voltage insulating sleeve 60, the first insulating air gap 27 between the platform base 22 and the high-voltage insulating sleeve 60, and the first insulating air gap 27 between the first rotary table 23 and the high-voltage insulating sleeve 60 to prevent arcing.

[0087] Furthermore, as Figure 8 and Figure 9As shown in the figure, a stepped hole 231 is formed on the top surface of the first rotating table 23, and a platform fixing flange 232 is provided on the periphery of the stepped hole 231. The high-voltage insulating platform 24 is fixed to the platform fixing flange 232. The stepped hole 231 forms a second insulating air gap 28 between the first rotating table 23 and the high-voltage insulating platform 24. Then, the bottom surface of the part of the high-voltage insulating platform 24 distributed above the stepped hole 231 is not in direct contact with the first rotating table 23, thereby increasing the creepage distance and preventing surface discharge and sparking.

[0088] Furthermore, as Figure 10 and Figure 11 shown in the figure, several insulating platform protrusions 242 are provided on the top surface and the bottom surface of the high-voltage insulating platform 24. The insulating platform protrusions 242 make the top surface and the bottom surface of the high-voltage insulating platform 24 both corrugated surfaces, thereby increasing the creepage distance and preventing surface discharge and sparking between the first rotating table 23 and the second rotating table 25. Preferably, several insulating platform protrusions 242 are arranged in a concentric circular ring shape or a spiral shape, and the cross-section of the insulating platform protrusions 242 is various cross-section shapes such as a rectangle, a triangle, or a trapezoid.

[0089] Furthermore, as Figure 8 shown in the figure, the platform unit 20 further includes an electrode connector 29 fixed between the high-voltage insulating platform 24 and the second rotating table 25. A first connector protrusion 291 protruding downward is provided on the bottom surface of the electrode connector 29, and a second connector protrusion 292 protruding upward is provided on the top surface of the electrode connector 29. The top of the high-voltage electrode 70 extends into the first connector protrusion 291 and is in contact and cooperation with the first connector protrusion 291. The second connector protrusion 292 extends into the second rotating table 25 and is in contact and cooperation with the second rotating table 25, so as to realize that the high-voltage electrode 70 provides a high potential to the anode assembly 43 of the measured X-ray tube 40 through the electrode connector 29 and the second rotating table 25. In addition, only the second connector protrusion 292 of the electrode connector 29 protrudes upward from the high-voltage insulating platform 24. Then, a stepped hole 243 for accommodating the electrode connector 29 is formed on the top surface of the high-voltage insulating platform 24, as Figure 8 and Figure 11 shown in the figure.

[0090] In the second embodiment of the device for measuring the beam output angle of an X-ray tube, the high-voltage insulating sleeve 60, the low-voltage insulating sleeve 80, the high-voltage insulating platform 24, the first insulating air gap 27, and the second insulating air gap 28 constitute a high-voltage insulating system. The high-voltage insulating sleeve 60, the low-voltage insulating sleeve 80, and the high-voltage insulating platform 24 are all made of high-voltage insulating materials, which include but are not limited to PEEK, G10, and ceramics, etc. Through the setting of the high-voltage insulating system and the working mode, the X-ray tube 40 to be measured can be directly placed in the air environment for testing, avoiding the deficiencies in the prior art of placing the X-ray tube 40 to be measured in an oil tank environment or encapsulating it into an X-ray source for testing, making the present application simple, convenient, and efficient.

[0091] The second embodiment of the method for measuring the beam output angle of an X-ray tube: The second embodiment of the method for measuring the beam output angle of an X-ray tube includes the following steps.

[0092] B1. Configure the second embodiment of the device for measuring the beam output angle of an X-ray tube described above.

[0093] B2. Define a three-axis coordinate system: As Figure 6 shown, define the focus of the X-ray tube 40 to be measured as the origin O of the three-axis coordinate system, define the central axis of the X-ray tube 40 to be measured as the Z-axis of the three-axis coordinate system, define the rotation axis of the driving swing arm 33 as the X-axis of the three-axis coordinate system, and define the horizontal axis in the horizontal plane that is orthogonal to the rotation axis of the driving swing arm 33 and passes through the focus of the X-ray tube 40 to be measured as the Y-axis of the three-axis coordinate system. The spatial coordinate position of the X-ray detector 50 relative to the focus of the X-ray tube 40 to be measured is represented by the circumferential angle α and the axial angle β. The circumferential angle α is determined by the rotation angle of the X-ray tube around the Z-axis, that is, determined by the rotation angle of the rotary platform around the Z-axis, and the axial angle β is determined by the swing angle of the driving swing arm 33. It is consistent with step A2 above.

[0094] B3. Zero the spatial coordinate position of the X-ray detector 50: The control and processing computer controls the swing arm drive source 32 and the rotary drive source 21 through the main controller to make both the circumferential angle α and the axial angle β be 0°.

[0095] B4. Install the X-ray tube 40 to be measured: Vertically fix the X-ray tube 40 to be measured on the second rotary table 25 so that the window 433 of the X-ray tube 40 to be measured faces the negative direction of the Y-axis; adjust the height of the second rotary table 25 so that the focus center of the X-ray tube 40 to be measured, the rotation axis of the driving swing arm 33, and the central axis of the X-ray detector 50 are at the same height position in the Z-axis direction.

[0096] B5. Set the spatial coordinate information of the X-ray tube 40 under test for which the light intensity needs to be measured in the control and processing computer: The spatial coordinate information includes the spatial coordinate positions (α, β) of several X-ray detectors 50 relative to the focal point of the X-ray tube 40 under test. The spatial coordinate information is the target area to be tested by the X-ray tube 40 under test. This is consistent with step A5 above.

[0097] B6. Set the tube voltage and tube current values output by the high-voltage generating system in the control and processing computer, drive the X-ray tube 40 under test to work to generate X-rays, and start the X-ray detection system to collect the X-ray light intensity. The control and processing computer controls the X-ray detection controller, and then the X-ray detection controller collects the X-ray light intensity data fed back by the X-ray detector 50 at a certain frequency. This is consistent with step A6 above.

[0098] B7. Obtain the spatial distribution of light intensity within the set spatial coordinate information and collect the X-ray light intensity at different spatial coordinate positions: The control and processing computer controls the rotation drive source 21 to work according to the circumferential angle α of the spatial coordinate position through the main controller, and controls the swing arm drive source 32 to work according to the axial angle β of the spatial coordinate position, rotates the X-ray tube 40 under test to the specified spatial position, and swings the drive swing arm 33 to the specified spatial position; after reaching the specified position, temporarily stay at this spatial coordinate position. After the control and processing computer receives the in-place flag information, it reads the light intensity values of the X-ray tube 40 under test collected continuously multiple times by the X-ray detector 50 at this spatial coordinate position, and calculates the average value as the light intensity information at this spatial coordinate position, and stores the light intensity information. After the light intensity information collection at one spatial coordinate position is completed, the control and processing computer controls the rotation drive source 21 and the swing arm drive source 32 to work according to the coordinate information table, so that the spatial coordinate position of the X-ray detector 50 relative to the focal point of the X-ray tube 40 under test reaches the next spatial coordinate position, and the control and processing computer collects and stores the X-ray light intensity information at this spatial coordinate position. Repeat this process until the X-ray light intensity information at all spatial coordinate positions is collected and stored.

[0099] B8. Processing of light intensity information: The control and processing computer processes the light intensity information corresponding to each spatial coordinate position to form the spatial distribution of light intensity of the X-ray tube 40 under test, such as forming a light intensity spatial distribution curve as shown in Figure 12 or forming a light intensity spatial distribution surface. This is consistent with step A8 above.

[0100] B9. Obtain the beam output angles (including the circumferential beam output angle and the axial beam output angle) of the X-ray tube 40 under test: The control and processing computer processes the spatial distribution of the light intensity of the X-ray tube 40 under test according to the set technical indicators, and defines the circumferential angle α corresponding to the light intensity at the edge position where the light intensity relative to the zero position satisfies the set attenuation percentage as the circumferential beam output angle of the X-ray tube 40 under test, and defines the axial angle β corresponding to the light intensity at the edge position where the light intensity relative to the zero position satisfies the set attenuation percentage as the axial beam output angle of the X-ray tube 40 under test. This is consistent with step A9 above.

[0101] Furthermore, when it is necessary to obtain the light intensity information at other spatial coordinate positions with nearly full angles, a coordinate information table needs to be established, such as several different angle values of α corresponding to β = 1°, and several different angle values of α corresponding to β = 2°; through similar settings, a coordinate information table of different circumferential angles α and axial angles β is established, and then through steps B6 to B9 above, the light intensity distribution of nearly full angles can be completed.

[0102] In the second embodiment of the method for measuring the beam output angle of the X-ray tube, the main controller is connected to the swing arm drive source 32 and the rotary drive source 21 to automatically control the positions of the swing of the swing arm 33 and the rotation of the X-ray tube 40 under test. The control and processing computer is used for the control between the main controller, the high-voltage generation system and the X-ray detection controller in the X-ray detection system. Through the control and processing computer, an instruction is sent to the main controller to control the swing arm drive source 32 to drive the swing arm 33 to move to the specified position, and to control the rotary drive source 21 to drive the X-ray tube 40 under test to move to the specified position. Through the control and processing computer, the high-voltage generator system is controlled to send specified high-voltage and current signals to the X-ray tube 40 under test, so that the X-ray tube 40 under test operates according to the specified tube voltage and tube current parameters. Through the control and processing computer, the light intensity data detected by the X-ray detector 50 and uploaded to the X-ray detection controller is read. Through the control and processing computer, the light intensity data collected at the corresponding spatial coordinate positions is processed to obtain the light intensity distribution of the X-ray tube 40 under test. Through the control and processing computer, the light intensity distribution of the X-ray tube 40 under test is further processed to obtain the beam output angle value of the X-ray tube 40 under test.

[0103] In summary, in this application, the rotary platform controls the rotation of the X-ray tube 40 to be measured around its own axis, and drives the swing arm 33 to drive the X-ray detector 50 to swing up and down around the focal point of the X-ray tube 40 to be measured on a spherical surface with a radius of R, so as to realize the scanning of almost all angles of the X-ray detector 50 for the X-ray tube 40 to be measured, measure the light intensity at different positions on the spherical surface with a distance of R from the focal point of the X-ray tube 40 to be measured, and complete the real light intensity measurement of almost all angles of all the target areas of interest around the X-ray tube 40 to be measured. The setting of the high-voltage insulation system in this application enables the X-ray tube 40 to be measured to directly perform tests in an air environment, making the tests simpler, more convenient and more efficient. Combining the advantages of real measurement, almost all-angle measurement and digital measurement, this application can be widely used in occasions where the light intensity and distribution of the X-ray tube and the beam output angle need to be measured.

[0104] The above embodiments are only illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A device for measuring the beam angle of an X-ray tube, characterized in that: The device for measuring the beam angle of the X-ray tube comprises an equipment frame, a platform unit, a swing arm rotation unit, an X-ray detection system, a main controller, a control and processing computer, a high-voltage insulating bushing, a high-voltage electrode inserted in the high-voltage insulating bushing, a low-voltage insulating bushing fixed to the equipment frame, and a low-voltage electrode inserted in the low-voltage insulating bushing; The platform unit includes a platform base fixed to an equipment frame, a rotating platform rotatably mounted on the equipment frame around a vertical axis, and a rotating drive source mounted on the equipment frame. The rotating platform includes a first turntable rotatably mounted on the platform base, a high-voltage insulating platform fixed on the top surface of the first turntable, and a second turntable fixed on the top surface of the high-voltage insulating platform. The rotating drive source is transmission-connected to the first turntable and is connected to a main controller. The platform base and the first turntable are both provided with insulating through holes for allowing a high-voltage insulating bushing to pass through. The top of the high-voltage insulating bushing is fixed in the high-voltage insulating platform. The top of the high-voltage electrode extends out of the high-voltage insulating bushing and is electrically connected to the second turntable. The anode assembly of the X-ray tube to be tested is fixed on the top surface of the second turntable. The low-voltage insulating bushing is arranged on the periphery of the platform unit. The low-voltage electrode is used to electrically connect to the The cathode assembly is electrically connected; a fixing hole for accommodating a high-voltage insulating bushing is provided in the high-voltage insulating platform, the aperture of the insulating through hole is larger than the aperture of the fixing hole, so that a first insulating air gap is formed between the platform base and the high-voltage insulating bushing, and between the first turntable and the high-voltage insulating bushing; a step hole is provided on the top surface of the first turntable, and a platform fixing flange is provided on the periphery of the step hole, the high-voltage insulating platform is fixed to the platform fixing flange, and the step hole forms a second insulating air gap between the first turntable and the high-voltage insulating platform; when the X-ray tube under test is tested, the first turntable is at a low potential, the second turntable is at a high potential, and the X-ray tube under test is in a single-ended working mode with anode high voltage and cathode grounding; the high-voltage insulating bushing, the low-voltage insulating bushing, the high-voltage insulating platform, the first insulating air gap and the second insulating air gap constitute a high-voltage insulation system; The swing arm rotation unit comprises a swing arm seat mounted on the equipment frame, a swing arm driving source mounted on the swing arm seat, and a driving swing arm rotatably mounted on the swing arm seat around a horizontal axis, the swing arm driving source is transmission-connected to the driving swing arm and connected to the main controller, and the focus of the X-ray tube to be tested is located on the rotation axis of the driving swing arm; The X-ray detection system comprises an X-ray detection controller and an X-ray detector connected to each other, wherein the X-ray detector is mounted on a driving swing arm and is aligned with the focus of the X-ray tube to be detected; The main controller and the X-ray detection controller are both connected to the control and processing computer; When the swing arm driving source drives the driving swing arm to swing around its rotation axis, the X-ray detector forms a spherical trajectory with the focus of the X-ray tube under test as the center and the distance between the X-ray detector and the focus of the X-ray tube under test as the radius, so that the X-ray detector is always aligned with the focus of the X-ray tube under test during the test, and the distance from the focus of the X-ray tube under test remains unchanged.

2. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The swing arm rotating unit also includes an air cooling unit installed on the swing arm seat. The swing arm seat is provided with an air cooling opening. The air cooling unit faces the anode assembly of the X-ray tube to be tested through the air cooling opening.

3. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The swing arm driving source and the rotation driving source are both motors.

4. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The top and bottom surfaces of the high-voltage insulating platform are provided with a plurality of insulating platform protrusions, and the insulating platform protrusions make the top and bottom surfaces of the high-voltage insulating platform both corrugated surfaces; the plurality of insulating platform protrusions are in the shape of concentric rings or spirals, and the cross-section of the insulating platform protrusion is rectangular, triangular, or trapezoidal.

5. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The platform unit also includes an electrode joint fixed between the high-voltage insulating platform and the second turntable, a first joint protrusion protruding downward is provided on the bottom surface of the electrode joint, a second joint protrusion protruding upward is provided on the top surface of the electrode joint, the top of the high-voltage electrode extends into the first joint protrusion and contacts and cooperates with the first joint protrusion, and the second joint protrusion extends into the second turntable and contacts and cooperates with the second turntable.

6. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The high-voltage insulating sleeve, the low-voltage insulating sleeve and the high-voltage insulating platform are all made of high-voltage insulating material, and the high-voltage insulating material is any one of PEEK, G10 and ceramic.

7. The device for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The equipment frame is provided with a horizontally extending installation platform, the swing arm seat is fixed on the top surface of the installation platform, and a platform opening portion penetrating from top to bottom is opened in the installation platform, and the platform opening portion allows the driving swing arm to swing downward.

8. A method for measuring the beam angle of an X-ray tube, characterized in that: The method for measuring the beam angle of an X-ray tube comprises the following steps: S1. A device for measuring the beam angle of an X-ray tube according to claim 1; S2. Install the X-ray tube to be tested on the rotary platform of the platform unit; S3, setting the spatial coordinate information of the light intensity of the X-ray tube to be measured; The spatial coordinate information includes the spatial coordinate positions of several X-ray detectors relative to the focus of the X-ray tube under test, each of which includes a circumferential angle α and an axial angle β, wherein the circumferential angle α is determined by the rotation angle of the X-ray tube under test relative to its central axis, and the axial angle β is determined by the swing angle of the driving swing arm; S4, driving the X-ray tube under test to work and starting the X-ray detection system; S5, obtaining the light intensity spatial distribution within the set spatial coordinate information; According to each spatial coordinate position in the spatial coordinate information, the control and processing computer controls the rotation drive source to work according to the circumferential angle α of the spatial coordinate position through the main controller to control the rotation angle of the X-ray tube under test relative to its central axis, and the control and processing computer controls the swing arm drive source to work according to the axial angle β of the spatial coordinate position through the main controller to control the swing angle of the driving swing arm; the control and processing computer obtains the light intensity information of the X-ray tube under test collected by the X-ray detector at each spatial coordinate position; the control and processing computer forms the light intensity spatial distribution of the X-ray tube under test according to each spatial coordinate position and the corresponding light intensity information; S6, obtaining the beam angle of the X-ray tube under test; The control and processing computer processes the light intensity spatial distribution of the X-ray tube under test according to the set technical indicators, defines the circumferential angle α corresponding to the light intensity at the edge position that meets the set attenuation percentage relative to the zero point position as the circumferential beam-out angle of the X-ray tube under test, and defines the axial angle β corresponding to the light intensity at the edge position that meets the set attenuation percentage relative to the zero point position as the axial beam-out angle of the X-ray tube under test.

9. The method for measuring the beam angle of an X-ray tube according to claim 8, characterized in that: The three-axis coordinate system corresponding to the spatial coordinate position is: the focus of the X-ray tube under test is the origin of the three-axis coordinate system, the central axis of the X-ray tube under test is the Z axis of the three-axis coordinate system, the rotation axis of the driving swing arm is the X axis of the three-axis coordinate system, and the horizontal axis in the horizontal plane that is orthogonal to the rotation axis of the driving swing arm and passes through the focus of the X-ray tube under test is the Y axis of the three-axis coordinate system.

10. The method for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: In the step S2, after the X-ray tube to be tested is installed, the driving swing arm is in a horizontal position, and the focus of the X-ray tube to be tested is directly facing the X-ray detector along the Y axis and is at the same height as the X-ray detector.

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