Method and device for measuring beam outlet angle of X-ray tube

Abstract

The invention provides a method and a device for measuring the beam-out angle of an X-ray tube. The method comprises the following steps: configuring the device for measuring the beam-out angle of the X-ray tube; the device for measuring the beam outlet angle of the X-ray tube comprises 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 comprises a swing arm seat, a swing arm driving source and a rotatable driving swing arm, and the focus of the detected X-ray tube is located on the rotation axis of the driving swing arm; the X-ray detector is mounted on the driving swing arm and is aligned with the focus of the detected X-ray tube; during testing, the rotation angle of the X-ray tube to be tested relative to the central axis of the X-ray tube is controlled according to the circumferential angle alpha, the swing angle of the driving swing arm is controlled according to the axial angle beta, nearly all-angle light intensity measurement of all interested target areas around the X-ray tube to be tested is obtained, and the beam outlet angle is accurately obtained according to real light intensity distribution. And the test accuracy of the beam outlet angle of the tested X-ray tube is improved.

Description

Technical Field

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

[0002] X-ray tube is a high-voltage and high-vacuum electronic device with electron emitter, which is widely used in the fields of industry, medical treatment and scientific instruments. Usually, X-ray tube mainly includes a shell for providing vacuum environment, and a cathode assembly and an anode assembly which are sealed and fixed to the shell. The cathode assembly contains electron emitter, and the anode assembly contains anode target. When the X-ray tube is working, electrons are emitted from the electron emitter, and then accelerated by the high-voltage electric field of tens 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, which 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 is the light intensity distribution on a sphere with a certain distance from the focus of the X-ray tube (i.e., the center of the anode target) as the center. The intensity and distribution of the X-rays emitted through the window of the X-ray tube, the beam angle (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 the key parameters of the X-ray tube, which are of great significance for how to design and manufacture X-ray tubes, define the index parameters of X-ray tubes, and guide the demand side on how to use X-ray tubes.

[0004] Prior art 1: my country's national standard GB / T 26833-2011 provides general technical conditions for industrial X-ray tubes for non-destructive testing instruments. Section 4.9 thereof proposes a method for measuring the effective beam angle, specifically, using X-ray photons to expose the film and then developing the film to measure the shadow area. However, this method of using film for photosensitization has the disadvantages of low sensitivity to X-ray light intensity and insufficient resolution. Moreover, with the 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 demander. 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 attenuation 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 X-ray light intensity actually received is gradually strengthened. 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: The Chinese invention patent application with the authorization announcement number CN113639671B discloses an angle detection device for an X-ray tube and a method of using the same, which comprises a first moving module, an oil tank, a focus 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 position 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 focus detector is used to detect the X-ray focus; the second moving module is used to drive the focus detector to move in the X direction and the Z direction, and obtain the position of the focus 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 the angle detection device, the second moving module drives the focus measuring instrument to move along the plane direction, and there is still the problem of inconsistent attenuation caused by the inconsistent path experienced by the X-ray, and the finally measured light intensity distribution is not the real light intensity distribution of the X-ray tube; in addition, it is necessary to install the X-ray tube in the oil tank, thereby providing 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 time.

[0006] Prior art 3: A Chinese invention patent application with application publication number CN115774283A discloses a method and system for testing the dose distribution of an X-ray source, which includes a dose tester, an xOy rotary lifting platform, and a yOz rotary telescopic arm, wherein the dose tester is fixed at the end of the upper arm of the yOz rotary telescopic arm; during the test, an X-ray source equipped with an X-ray tube is placed flat on the xOy rotary lifting platform, with the X-ray exit window of the X-ray source facing upward, and the dose tester fixed on the yOz rotary 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 the X-ray tube is completely fixed in the X-ray source, the test method and system are not convenient for measuring the light intensity on the back of the X-ray tube (the side opposite to the window of the X-ray tube), and thus cannot evaluate the shielding effectiveness of the design of the anode cap of the X-ray tube. In addition, when packaging into an X-ray source (a downstream product of an X-ray tube), the X-ray tube needs to be assembled, evacuated, oiled and sealed. If this method is used to measure the angle of the X-ray tube, the test efficiency is very low. Summary of the invention

[0007] In view of the shortcomings of the prior art mentioned above, 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 path traversed by the X-rays, but also facilitate the acquisition of the light intensity on the back of the X-ray tube, thereby obtaining the true light intensity distribution of the X-ray tube under test at almost all angles, and finally obtaining 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: S1. A device for measuring the beam angle of the X-ray tube is provided; 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; S2. Install the X-ray tube to be tested on 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 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; 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.

[0009] 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; 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.

[0010] 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.

[0011] 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.

[0012] 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; The platform unit is installed on the equipment frame and is used to load the vertically placed X-ray tube to be tested; 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.

[0013] 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.

[0014] 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.

[0015] Furthermore, the swing arm driving source and the rotation driving source are both motors.

[0016] 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; 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; 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; 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.

[0017] Furthermore, a fixing hole for accommodating a high-voltage insulating bushing is provided in the high-voltage insulating platform, and 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.

[0018] Furthermore, 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.

[0019] Furthermore, a plurality of insulating platform protrusions are provided on the top and bottom surfaces of the high-voltage insulating platform, and the insulating platform protrusions make the top and bottom surfaces of the high-voltage insulating platform 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, trapezoidal or other cross-sectional shapes.

[0020] Furthermore, 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.

[0021] Furthermore, the high-voltage insulating bushing, the low-voltage insulating bushing 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 and ceramics.

[0022] Furthermore, the equipment frame is provided with a horizontally extending mounting platform, the swing arm seat is fixed on the top surface of the mounting platform, and a platform opening portion penetrating from top to bottom is opened in the mounting platform, and the platform opening portion allows the swing arm to be driven to swing downward.

[0023] As described above, the method and device for measuring the beam angle of an X-ray tube according to the present invention have the following beneficial effects.

[0024] When testing the X-ray tube under test, the X-ray tube under test is vertically mounted on the platform unit. By changing the rotation angle of the X-ray tube under test and driving the swing arm to drive the X-ray detector to swing, the X-ray detector forms a trajectory of a sphere 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, thereby measuring the light intensity at different positions on the sphere (i.e., the target area corresponding to the set spatial coordinate information), and at the same time, conveniently obtaining the light intensity on the back of the window of the X-ray tube under test, thereby completing the nearly full-angle light intensity measurement of all the target areas of interest around the X-ray tube under test. During the test, the X-ray detector is always aimed 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, so that the path taken by the X-ray emitted from the window of the X-ray tube under test to reach the X-ray detector is consistent, ensuring that the measured light intensity is the real light intensity distribution of the X-ray tube under test. Ultimately, the present application can obtain the true light intensity distribution of nearly all angles of all target areas of interest around the tested X-ray tube, and accurately obtain its beam angle based on the true light intensity distribution of the tested X-ray tube, thereby improving the test accuracy of the beam angle of the tested X-ray tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the structure of the X-ray tube under test in this application.

[0026] Figure 2 for Figure 1 Cross-sectional view of .

[0027] Figure 3 This is a schematic structural diagram of a first embodiment of a device for measuring an output beam angle of an X-ray tube according to the present application.

[0028] Figure 4 and Figure 5 for Figure 3 Schematic diagram of the structure of the middle swing arm rotation unit from different perspectives.

[0029] Figure 6 This is a schematic structural diagram of a second embodiment of the device for measuring the beam angle of an X-ray tube according to the present application.

[0030] Figure 7 for Figure 6 Schematic diagram of the structure of the middle platform unit.

[0031] Figure 8 for Figure 7 Cross-sectional view of .

[0032] Fig. 9 for Figure 7 Schematic diagram of the structure of the middle platform base and the first turntable.

[0033] Fig.10 for Figure 7 Structural schematic diagram of medium and high voltage insulation platform.

[0034] Fig.11 for Fig.10 Cross-sectional view of .

[0035] Fig.12 This is a schematic diagram of the light intensity spatial distribution curve and beam output angle of the X-ray tube under test obtained in this application. DETAILED DESCRIPTION

[0036] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0037] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0038] It should also be noted that when an element is referred to as being "fixed on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0039] In addition, the descriptions of "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 number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0040] The present invention provides a method and device for measuring the beam angle of an X-ray tube, which are used to measure the beam angle of an X-ray tube. The X-ray tube to be measured is defined as the measured X-ray tube 40.

[0041] like Figure 1 and Figure 2 As shown, the X-ray tube 40 under test includes a housing 41, a cathode assembly 42 sealed and fixed at one end of the housing 41, and an anode assembly 43 sealed and fixed at 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 under test is in operation, electrons are emitted from the electron emitter and accelerated by a high voltage electric field of tens 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, which are emitted at a certain angle through the window 433. The center of the anode target 432 in the X-ray tube 40 under test is the focus of the X-ray tube 40 under test.

[0042] The following provides preferred embodiments of an apparatus for measuring an X-ray tube beam angle and a method for measuring an X-ray tube beam angle.

[0043] Embodiment 1 of the device for measuring the beam angle of an X-ray tube: Figure 3 As shown, the first embodiment 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. The platform unit 20 is installed on the equipment frame 10, and the top of the platform unit 20 is used to load the vertically placed X-ray tube 40 to be tested. 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.

[0044] 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.

[0045] A1. Embodiment 1 of the device for measuring the beam angle of an X-ray tube as described above.

[0046] 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.

[0047] 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.

[0048] Regarding 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 of the X-ray tube 40 under test facing the positive direction of the X-axis is a positive circumferential angle, and the circumferential angle α of the X-ray tube 40 under test facing the negative direction of the X-axis is a negative circumferential angle. The circumferential angle α when the window 433 of the X-ray tube 40 under test faces the negative direction of the Y-axis is defined as 0°, which is the center position of the distribution of the circumferential angle α.

[0049] 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., toward the positive direction of the Z axis) is a positive axial angle, and the axial angle β when the driving swing arm 33 swings downward relative to the Y axis (i.e., toward the negative direction of the Z axis) is a negative axial angle. The axial angle β when the window 433 of the X-ray tube 40 under test faces the X-ray detector 50 along the negative direction of the Y axis is defined as 0°, which is the center position of the axial angle β distribution. At this time, the driving swing arm 33 is located in the XOY horizontal plane.

[0050] A3. The X-ray tube 40 to be tested is vertically mounted on the platform unit 20. By changing the rotation angle of the X-ray tube 40 to be tested relative to the Z axis and driving the swing arm 33 to drive the X-ray detector 50 to swing up and down, the X-ray detector 50 can be placed at different spatial positions on a sphere with the focus of the X-ray tube 40 to be tested as the center and the distance between the X-ray detector 50 and the focus of the X-ray tube 40 to be tested 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 a position horizontally aligned with the focus of the X-ray tube 40 to be tested, the spatial coordinate position of the X-ray detector 50 is (0°, 0°); when the X-ray tube 40 to be tested is rotated 1° counterclockwise 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°).

[0051] A4. Return the spatial coordinate position of the X-ray detector 50 to zero: After the X-ray tube 40 to be tested is installed, by adjusting the rotation angle of the X-ray tube 40 to be tested 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 tested, the driving swing arm 33 is in a horizontal position, the window 433 of the X-ray tube 40 to be tested faces the negative direction of the Y axis, and the focus of the X-ray tube 40 to be tested is 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 tested 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 tested is (0°, 0°). Preferably, the installation height of the X-ray tube 40 under test can be achieved by adjusting the height of the platform unit 20, such as replacing the platform unit 20 with a different height, or using a platform unit 20 with a height adjustment mechanism, so that after the X-ray tube 40 under test is installed, in the initial 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 located at the same height position in the Z-axis direction.

[0052] A5. Set the spatial coordinate information of the light intensity of the X-ray tube 40 to be measured in the control and processing computer: the spatial coordinate information includes the spatial coordinate position (α, β) of the plurality of 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 of ​​the X-ray tube 40 to be tested. In the control and processing computer, a coordinate information table is compiled according to different preset coordinates (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 being 0°, and the angle value information of different β corresponding to α being 1°.

[0053] A6. Set the operating power value of the X-ray tube 40 under test in the control and processing computer, drive the X-ray tube 40 under test to work, and start the X-ray detection system. The X-ray detector 50 then starts to collect the intensity of the X-rays emitted from the window 433 of the X-ray tube 40 under test. The control and processing computer controls the X-ray detection controller to collect the X-ray intensity data fed back by the X-ray detector 50 at a certain frequency.

[0054] A7. Obtain the spatial distribution of light intensity in the set spatial coordinate information: according to each spatial coordinate position in the spatial coordinate information, the rotation angle of the X-ray tube 40 under test relative to the Z 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 drive source 32 according to the axial angle β of the spatial coordinate position through the main controller, and controls the swing angle of the driving swing arm 33, thereby realizing that the spatial coordinate position of the focus of the X-ray tube 40 under test reaches the specified position (α, β); thereafter, it remains at the spatial coordinate position for a set time, that is, temporarily stays at this spatial coordinate position, and the control and processing computer reads the light intensity values ​​of the X-ray tube 40 under test collected by the X-ray detector 50 at each spatial coordinate position for multiple times, and calculates the average value as the light intensity information of the spatial coordinate position, and stores the light intensity information. After the light intensity information of one spatial coordinate position is collected, the rotation angle of the X-ray tube 40 under test relative to the Z axis and / or the swing angle of the driving swing arm 33 are changed according to the coordinate information table, so that the spatial coordinate position of the X-ray detector 50 relative to the focus 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. This cycle is repeated until the X-ray light intensity information at all spatial coordinate positions is collected and stored.

[0055] 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 light intensity spatial distribution of the X-ray tube 40 under test, for example, Fig.12 The light intensity spatial distribution curve shown, or the light intensity spatial distribution surface is formed.

[0056] A9. Obtain the beam-emitting angle (including the circumferential beam-emitting angle and the axial beam-emitting 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 that meets the set attenuation percentage relative to the zero-point position as the circumferential beam-emitting angle of the X-ray tube 40 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-emitting angle of the X-ray tube 40 under test. The technical indicators are formulated by the designer and manufacturer of the X-ray tube 40 under test, and / or the demander (i.e., the designer and manufacturer of the X-ray source), or are specified according to the update level of subsequent standards. Usually, the circumferential beam-emitting angle refers to 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 when the axial angle β is 0°, and the axial beam-emitting angle refers to 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 when the circumferential angle α is 0°. For example, Fig.12The light intensity spatial distribution curve of the X-ray tube 40 under test shown shows 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 X-rays is the maximum. According to the requirements of the technical indicators, the position at which the maximum light intensity corresponding to the zero position is attenuated by 75% is defined as the circumferential beam-out angle of the X-ray tube 40 under test, and the circumferential beam-out 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 attenuates by the set percentage relative to the zero position when the axial angle β is other angles can also be defined as the circumferential beam-out angle, and the axial angle β corresponding to the light intensity at the edge position where the light intensity attenuates by the set percentage relative to the zero position when the circumferential angle α is other angles can be defined as the axial beam-out angle. Based on the X-ray detector 50 forming 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, the present application can measure the light intensity and beam angle of all target areas of interest around the X-ray tube 40 under test, and can even obtain beam angles at different circumferential and axial positions formed by combining multiple circumferential angles α and axial angles β. In other words, the beam angle of the X-ray tube 40 under test is a spatial distribution of light intensity composed of numerous circumferential positions and axial positions.

[0057] Furthermore, when it is necessary to obtain the light intensity information of other spatial coordinate positions at nearly full angles, it is necessary to establish a coordinate information table, 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 the above steps A6 to A9, the light intensity distribution at nearly full angles can be completed.

[0058] In summary, when the X-ray tube 40 under test is tested, the X-ray tube 40 under test is vertically mounted on the platform unit 20, and the rotation angle of the X-ray tube 40 under test is changed, and the swing arm 33 is driven to drive the X-ray detector 50 to swing, so that the X-ray detector 50 forms a circular or arc trajectory on a spherical surface 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, thereby measuring the light intensity at different positions on the spherical surface (that is, the target area corresponding to the set spatial coordinate information), and at the same time, the light intensity on the back side of the window 433 of the X-ray tube 40 under test is conveniently obtained, thereby completing the nearly full-angle light intensity measurement of all the target areas of interest around the X-ray tube 40 under test. During the test, the X-ray detector 50 is always aimed at the focus of the X-ray tube 40 under test, and the distance from the focus of the X-ray tube 40 under test remains unchanged, so that the path taken by the X-ray emitted from the window 433 of the X-ray tube 40 under test to reach the X-ray detector 50 is consistent, ensuring that the measured light intensity is the real light intensity distribution of the X-ray tube 40 under test. Finally, the present application can conveniently and quickly obtain the real light intensity distribution of the X-ray tube 40 under test at almost all angles, and the light intensity distribution can be digitally measured, and the beam angle of the X-ray tube 40 under test can be accurately obtained according to the real light intensity distribution of the X-ray tube 40 under test, thereby improving the test accuracy of the beam angle of the X-ray tube 40 under test.

[0059] Furthermore, in the first embodiment of the device for measuring the beam angle of an X-ray tube, Figure 3 As shown, the equipment rack 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 equipped with anchor bolts or walking wheels with brakes; the mounting platform 101 extends horizontally and is used to provide an installation reference. The swing arm rotation unit 30 and the platform unit 20 are both installed on the mounting platform 101. Figure 3 As shown, the swing arm seat 31 is fixed on the top surface of the mounting platform 101, and a platform opening 102 is provided in the mounting platform 101, which is through from top to bottom. The platform opening 102 allows the driving swing arm 33 to swing downward, and provides a swing 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 testing, the rotation angle of the X-ray tube 40 under test relative to the Z axis is adjusted by manually disassembling and assembling the X-ray tube 40 under test on the fixed platform 210 according to a preset circumferential angle α.

[0060] Furthermore, in the first embodiment of the device for measuring the beam angle of an X-ray tube, 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.

[0061] 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.

[0062] 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 .

[0063] 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.

[0064] Furthermore, if Figure 6 As shown, the second embodiment of the device for measuring the beam angle of an X-ray tube also includes a high-voltage generating system, a high-voltage insulating sleeve 60, a high-voltage electrode 70 inserted in the high-voltage insulating sleeve 60, a low-voltage insulating sleeve 80 fixed to the mounting platform 101, and a low-voltage electrode inserted 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 under test 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 under test 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 enable the X-ray tube 40 under test to work and generate X-rays. When the X-ray tube 40 under test is fixed on the rotating platform, the anode assembly 43 can be fixed to the rotating platform, or the cathode assembly 42 can be fixed to the rotating platform. Preferably, Figure 6 In the illustrated embodiment, the anode assembly 43 of the X-ray tube 40 under test is fixed to the rotating platform; based on this, the platform unit 20 also includes a platform base 22 fixed on the top surface of the mounting platform 101, and the rotating platform includes a first turntable 23 rotatably mounted on the platform base 22, a high-voltage insulating platform 24 fixed on the top surface of the first turntable 23, and a second turntable 25 fixed on the top surface of the high-voltage insulating platform 24, and the rotary drive source 21 is transmission-connected to the first turntable 23. Both the platform base 22 and the first turntable 23 are provided with an insulating through hole 26 that allows the high-voltage insulating sleeve 60 to pass through. The insulating through hole 26 is a through hole structure that passes through from top to bottom. 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 passed through the high-voltage insulating platform 24 and is electrically connected to the second turntable 25. The anode assembly 43 of the X-ray tube 40 under test is fixed on the top surface of the second turntable 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 turntable 23 and the rotary drive source 21.

[0065] When the X-ray tube 40 under test is tested, driven by the rotary drive source 21, the first turntable 23, the high-voltage insulating sleeve 60, the second turntable 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 turntable 23 is at a low potential, such as ground potential; the high-voltage electrode 70 provides a high-voltage potential to the second turntable 25, so that the second turntable 25 is at a high potential, such as tens of kV or hundreds of kV higher, thereby providing a high-voltage potential to the anode assembly 43 of the X-ray tube 40 under test; that is, the X-ray tube 40 under test is in a single-ended working mode with anode high voltage and cathode grounding, so there is no need to consider the insulation of the low-voltage electrode from the surrounding metal parts. At the same time, the high-voltage insulating sleeve 60 separates the low potential of the first turntable 23 and the high potential of the second turntable 25, providing high-voltage insulation to prevent high-voltage sparks during testing. In addition, if Figure 6 As shown, the low-voltage insulating sleeve 80 is arranged on the periphery of the platform unit 20 to constrain the lead position of the low-voltage electrode and prevent sparks from occurring between the low-voltage electrode and components at high voltage (such as the second turntable 25 and the high-voltage electrode 70).

[0066] Preferably, during testing, when the X-ray tube 40 to be tested is fixed on the second turntable 25, the height of the second turntable 25 is adjusted so that the focal center of the X-ray tube 40 to be tested 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 turntable 25 can be achieved by selecting a second turntable 25 of different heights or using a second turntable 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 to be tested, 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.

[0067] Furthermore, if Figure 8 , Fig.10 and Fig.11 As shown, a fixing hole 241 for accommodating a high-voltage insulating bushing 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 bushing 60, and between the first turntable 23 and the high-voltage insulating bushing 60. The high-voltage electrode 70 is insulated by the high-voltage insulating bushing 60, the first insulating air gap 27 between the platform base 22 and the high-voltage insulating bushing 60, and the first insulating air gap 27 between the first turntable 23 and the high-voltage insulating bushing 60 to prevent sparks.

[0068] Furthermore, if Figure 8 and Fig. 9As shown, a step hole 231 is provided on the top surface of the first turntable 23, and a platform fixing flange 232 is provided on the periphery of the step hole 231. The high-voltage insulating platform 24 is fixed to the platform fixing flange 232. The step hole 231 forms a second insulating air gap 28 between the first turntable 23 and the high-voltage insulating platform 24. The bottom surface of the high-voltage insulating platform 24 above the step hole 231 is not in direct contact with the first turntable 23, thereby increasing the creepage distance and preventing surface discharge sparking.

[0069] Furthermore, if Fig.10 and Fig.11 As shown, a plurality of insulating platform protrusions 242 are provided on the top and bottom surfaces of the high-voltage insulating platform 24. The insulating platform protrusions 242 make the top and bottom surfaces of the high-voltage insulating platform 24 corrugated surfaces, thereby increasing the creepage distance and preventing surface discharge and sparking between the first turntable 23 and the second turntable 25. Preferably, the plurality of insulating platform protrusions 242 are in the shape of concentric rings or spirals, and the cross-section of the insulating platform protrusions 242 is in various cross-sectional shapes such as rectangle, triangle, or trapezoid.

[0070] Furthermore, if Figure 8 As shown, the platform unit 20 also includes an electrode connector 29 fixed between the high-voltage insulating platform 24 and the second turntable 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 contacts and cooperates with the first connector protrusion 291. The second connector protrusion 292 extends into the second turntable 25 and contacts and cooperates with the second turntable 25, so that the high-voltage electrode 70 provides a high potential to the anode assembly 43 of the X-ray tube 40 under test through the electrode connector 29 and the second turntable 25. In addition, only the second connector protrusion 292 of the electrode connector 29 emerges upward from the high-voltage insulating platform 24, and a stepped hole 243 for accommodating the electrode connector 29 is opened on the top surface of the high-voltage insulating platform 24, as shown in FIG. Figure 8 and Fig.11 shown.

[0071] In the second embodiment of the device for measuring the beam angle of an X-ray tube, a high-voltage insulating sleeve 60, a low-voltage insulating sleeve 80, a high-voltage insulating platform 24, a first insulating air gap 27 and a 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, and the high-voltage insulating materials include but are not limited to PEEK, G10 and ceramics. Through the setting of the high-voltage insulating system and the working mode, the X-ray tube 40 to be tested can be directly placed in an air environment to perform the test, avoiding the shortcomings of the prior art that the X-ray tube 40 to be tested is placed in an oil tank environment or encapsulated in an X-ray source for testing, so that the present application has the advantages of simplicity, convenience and high efficiency.

[0072] Embodiment 2 of the method for measuring the beam angle of an X-ray tube: Embodiment 2 of the method for measuring the beam angle of an X-ray tube includes the following steps.

[0073] B1. Embodiment 2 of the device for measuring the beam angle of an X-ray tube.

[0074] B2. Define the three-axis coordinate system: Figure 6 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. The spatial coordinate position of the X-ray detector 50 relative to the focus of the X-ray tube 40 to be tested is represented by a circumferential angle α and an axial angle β. The circumferential angle α is determined by the rotation angle of the X-ray tube around the Z axis, that is, by the rotation angle of the rotating 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 the above step A2.

[0075] B3. The spatial coordinate position of the X-ray detector 50 returns to zero: the control and processing computer controls the swing arm drive source 32 and the rotary drive source 21 through the main controller, so that the circumferential angle α and the axial angle β are both 0°.

[0076] B4. Install the X-ray tube 40 to be tested: vertically fix the X-ray tube 40 to be tested on the second turntable 25 so that the window 433 of the X-ray tube 40 to be tested faces the negative direction of the Y-axis; adjust the height of the second turntable 25 so that the focal center of the X-ray tube 40 to be tested, 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.

[0077] B5. Set the spatial coordinate information of the light intensity of the X-ray tube 40 to be measured in the control and processing computer: the spatial coordinate information includes the spatial coordinate positions (α, β) of the plurality of 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 of ​​the X-ray tube 40 to be tested. This is consistent with the above step A5.

[0078] 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 generate X-rays, and start the X-ray detection system to collect X-ray light intensity. The control and processing computer controls the X-ray detection controller, and the X-ray detection controller collects X-ray light intensity data fed back by the X-ray detector 50 at a certain frequency. This is consistent with the above step A6.

[0079] B7. Obtain the spatial distribution of light intensity in the set spatial coordinate information and collect X-ray light intensity at different spatial coordinate positions: the control and processing computer controls the rotary drive source 21 to work according to the circumferential angle α of the spatial coordinate position and controls the swing arm drive source 32 to work according to the axial angle β of the spatial coordinate position through the main controller, rotates the X-ray tube 40 to the specified spatial position, and swings the drive swing arm 33 to the specified spatial position; after reaching the specified position, it temporarily stays at this spatial coordinate position. After receiving the in-place mark information, the control and processing computer reads the light intensity values ​​of the X-ray tube 40 to be tested collected by the X-ray detector 50 at the spatial coordinate position for multiple times, and calculates the average value as the light intensity information of the spatial coordinate position, and stores the light intensity information. After the light intensity information of a spatial coordinate position is collected, the control and processing computer controls the rotary drive source 21 and the swing arm drive source 32 to work according to the coordinate information table, so that the X-ray detector 50 reaches the next spatial coordinate position relative to the spatial coordinate position of the focus of the X-ray tube 40 to be tested, and the control and processing computer collects and stores the X-ray light intensity information at this spatial coordinate position. This cycle is repeated until the X-ray intensity information at all spatial coordinate positions is collected and stored.

[0080] 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 light intensity spatial distribution of the X-ray tube 40 under test, for example, Fig.12 The light intensity spatial distribution curve shown, or the light intensity spatial distribution surface, is formed, which is consistent with the above step A8.

[0081] B9, obtaining the beam-out angle (including the circumferential beam-out angle and the axial beam-out angle) of the X-ray tube 40 under test: the control and processing computer processes the light intensity spatial distribution of the X-ray tube 40 under test according to the set technical indicators, defines the circumferential angle α corresponding to the edge position light intensity that meets the set attenuation percentage relative to the zero position light intensity as the circumferential beam-out angle of the X-ray tube 40 under test, and defines the axial angle β corresponding to the edge position light intensity that meets the set attenuation percentage relative to the zero position light intensity as the axial beam-out angle of the X-ray tube 40 under test. This is consistent with the above step A9.

[0082] Furthermore, when it is necessary to obtain the light intensity information of other spatial coordinate positions at nearly full angles, it is necessary to establish a coordinate information table, 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 the above steps B6 to B9, the light intensity distribution at nearly full angles can be completed.

[0083] In the second embodiment of the method for measuring the beam angle of an 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 swing position of the driving swing arm 33 and the rotation position of the X-ray tube 40 to be measured. 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 issued to the main controller to control the swing arm drive source 32 to drive the driving swing arm 33 to move to a specified position, and to control the rotary drive source 21 to drive the X-ray tube 40 to be measured to move to a specified position. Through the control and processing computer, the high voltage generator system is controlled to send a specified high voltage and current signal to the X-ray tube 40 to be measured, so that the X-ray tube 40 to be measured works 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 position is processed to obtain the light intensity distribution of the X-ray tube 40 to be measured. The light intensity distribution of the X-ray tube 40 under test is further processed by the control and processing computer to obtain the beam angle value of the X-ray tube 40 under test.

[0084] In summary, the present application controls the rotation of the X-ray tube 40 under test around its own axis through the rotating platform, and drives the swing arm 33 to drive the X-ray detector 50 to swing up and down on a spherical surface with a radius of R around the focus of the X-ray tube 40 under test, so as to realize the X-ray detector 50 to scan the X-ray tube 40 under test at nearly full angles, measure the light intensity at different positions on the spherical surface with a distance R from the focus of the X-ray tube 40 under test, and complete the real light intensity measurement of nearly full angles of all target areas of interest around the X-ray tube 40 under test. The setting of the high-voltage insulation system in the present application enables the X-ray tube 40 under test to be directly placed in an air environment for testing, which makes the test simpler, more convenient and more efficient. Combined with the advantages of real measurement, nearly full-angle measurement and digital measurement, the present application can be widely used in occasions where the light intensity and distribution of the X-ray tube and the beam angle need to be measured.

[0085] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. 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 the X-ray tube is provided; The device for measuring the beam angle of an X-ray tube comprises 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; the platform unit (20) is mounted on the equipment frame (10) and is used to load a vertically placed X-ray tube (40) to be measured; the swing arm rotation unit (30) comprises a swing arm seat (31) mounted on the equipment frame (10), a swing arm driving source (32) mounted on the swing arm seat (31), and a swing arm drive source (32) mounted on the swing arm seat (31) and rotatably mounted on the swing arm around a horizontal axis. The drive swing arm (33) of the base (31) is connected to the drive swing arm (33), the swing arm drive source (32) is connected to the drive swing arm (33) and is connected to the main controller, and the focus of the X-ray tube (40) under test is located on the rotation axis of the drive swing arm (33); the X-ray detection system comprises an X-ray detection controller and an X-ray detector (50) connected to each other, the X-ray detector (50) is installed on the drive swing arm (33) and is aligned with the focus of the X-ray tube (40) under test; the main controller and the X-ray detection controller are both connected to a control and processing computer; S2, installing the X-ray tube (40) to be tested on the platform unit (20); S3, setting the spatial coordinate information of the light intensity of the X-ray tube (40) to be measured; The spatial coordinate information includes the spatial coordinate positions of a plurality of X-ray detectors (50) relative to the focus of the X-ray tube (40) under test, each spatial coordinate position including a circumferential angle α and an axial angle β, the circumferential angle α being determined by the rotation angle of the X-ray tube (40) under test relative to its central axis, and the axial angle β being determined by the swing angle of the driving swing arm (33); S4, driving the X-ray tube (40) to be tested to operate, 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 rotation angle of the X-ray tube (40) 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 drive source (32) through the main controller according to the axial angle β of the spatial coordinate position to control the swing angle of the drive swing arm (33); the control and processing computer obtains the light intensity information of the X-ray tube (40) under test collected by the X-ray detector (50) at each spatial coordinate position; the control and processing computer forms the light intensity spatial distribution of the X-ray tube (40) under test according to each spatial coordinate position and the corresponding light intensity information; S6, obtaining the beam output angle of the X-ray tube (40) under test; The control and processing computer processes the light intensity spatial distribution of the X-ray tube (40) under test according to the set technical indicators, defines the circumferential angle α corresponding to the light intensity at the edge position that satisfies the set attenuation percentage relative to the zero-point position as the circumferential beam-out angle of the X-ray tube (40) under test, and defines the axial angle β corresponding to the light intensity at the edge position that satisfies the set attenuation percentage relative to the zero-point position as the axial beam-out angle of the X-ray tube (40) under test.

2. The method for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The platform unit (20) comprises a slewing platform rotatably mounted on a device frame (10) about a vertical axis, and a slewing driving source (21) mounted on the device frame (10), wherein the slewing driving source (21) is transmission-connected to the slewing platform and connected to a main controller; In step S5, the control and processing computer controls the operation of the rotary drive source (21) 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 (40) under test relative to its central axis.

3. The method for measuring the beam angle of an X-ray tube according to claim 1, characterized in that: The three-axis coordinate system corresponding to the spatial coordinate position is: the focus of the X-ray tube (40) under test is the origin of the three-axis coordinate system, the central axis of the X-ray tube (40) under test is the Z axis of the three-axis coordinate system, the rotation axis of the driving swing arm (33) 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 (33) and passes through the focus of the X-ray tube (40) under test is the Y axis of the three-axis coordinate system.

4. The method for measuring the beam angle of an X-ray tube according to claim 3, characterized in that: In the step S2, after the X-ray tube (40) to be tested is installed, the driving swing arm (33) is in a horizontal position, and the focal point of the X-ray tube (40) to be tested is directly opposite to the X-ray detector (50) along the Y axis and is at the same height as the X-ray detector (50).

5. A device for measuring the beam angle of an X-ray tube, characterized in that: The device for measuring the beam angle of an X-ray tube comprises 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; The platform unit (20) is installed on the equipment frame (10) and is used to load the vertically placed X-ray tube (40) to be tested; The swing arm rotation unit (30) comprises a swing arm seat (31) mounted on the equipment frame (10), a swing arm driving source (32) mounted on the swing arm seat (31), and a driving swing arm (33) mounted on the swing arm seat (31) rotatably around a horizontal axis, the swing arm driving source (32) being transmission-connected to the driving swing arm (33) and connected to a main controller, and 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 comprises an X-ray detection controller and an X-ray detector (50) connected to each other, wherein the X-ray detector (50) is mounted on a driving swing arm (33) and is aligned with the focus of the X-ray tube (40) 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 (32) drives the driving swing arm (33) to swing around its rotation axis, the X-ray detector (50) forms 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.

6. The device for measuring the beam angle of an X-ray tube according to claim 5, characterized in that: The swing arm rotating unit (30) further comprises an air cooling unit (34) mounted on the swing arm seat (31); an air cooling opening (35) is provided on the swing arm seat (31); the air cooling unit (34) faces the anode assembly (43) of the X-ray tube (40) to be tested through the air cooling opening (35).

7. The device for measuring the beam angle of an X-ray tube according to claim 5, characterized in that: The platform unit (20) comprises a slewing platform rotatably mounted on a device frame (10) about a vertical axis, and a slewing drive source (21) mounted on the device frame (10), the slewing drive source (21) being transmission-connected to the slewing platform and connected to a main controller, and the slewing platform is used to load an X-ray tube (40) to be tested.

8. The device for measuring the beam angle of an X-ray tube according to claim 7, characterized in that: The swing arm drive source (32) and the rotation drive source (21) are both motors.

9. The device for measuring the beam angle of an X-ray tube according to claim 7, characterized in that: It also includes a high-voltage insulating bushing (60), a high-voltage electrode (70) inserted into the high-voltage insulating bushing (60), a low-voltage insulating bushing (80) fixed to the equipment frame (10), and a low-voltage electrode inserted into the low-voltage insulating bushing (80); The platform unit (20) further comprises a platform base (22) fixed to the equipment frame (10); the rotary platform comprises 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 drive source (21) is drivingly connected to the first rotary table (23); The platform base (22) and the first turntable (23) are both provided with an insulating through hole (26) for allowing a high-voltage insulating bushing (60) to pass through; the top of the high-voltage insulating bushing (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 bushing (60) and is electrically connected to the second turntable (25); the anode assembly (43) of the X-ray tube (40) under test is fixed on the top surface of the second turntable (25); when the X-ray tube (40) under test is tested, the first turntable (23) is at a low potential and the second turntable (25) is at a high potential; The low-voltage insulating sleeve (80) is arranged on the periphery of the platform unit (20), and the low-voltage electrode is used to be electrically connected to a cathode assembly (42) of a tested X-ray tube (40).

10. The device for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: The high-voltage insulating platform (24) is provided with a fixing hole (241) for accommodating a high-voltage insulating bushing (60); the diameter of the insulating through hole (26) is larger than the diameter 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 bushing (60), and between the first rotating platform (23) and the high-voltage insulating bushing (60).

11. The device for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: A step hole (231) is provided on the top surface of the first turntable (23), and a platform fixing flange (232) is provided on the periphery of the step hole (231); the high-voltage insulating platform (24) is fixed to the platform fixing flange (232); the step hole (231) forms a second insulating air gap (28) between the first turntable (23) and the high-voltage insulating platform (24).

12. The device for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: A plurality of insulating platform protrusions (242) are provided on the top and bottom surfaces of the high-voltage insulating platform (24), and the insulating platform protrusions (242) make the top and bottom surfaces of the high-voltage insulating platform (24) both corrugated surfaces; the plurality of insulating platform protrusions (242) are in the shape of concentric rings or spirals, and the cross-section of the insulating platform protrusions (242) is rectangular, triangular, or trapezoidal.

13. The device for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: The platform unit (20) further comprises an electrode joint (29) fixed between the high-voltage insulating platform (24) and the second turntable (25); a first joint protrusion (291) protruding downward is provided on the bottom surface of the electrode joint (29); a second joint protrusion (292) protruding upward is provided on the top surface of the electrode joint (29); the top of the high-voltage electrode (70) extends into the first joint protrusion (291) and contacts and cooperates with the first joint protrusion (291); and the second joint protrusion (292) extends into the second turntable (25) and contacts and cooperates with the second turntable (25).

14. The device for measuring the beam angle of an X-ray tube according to claim 9, characterized in that: 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 material, and the high-voltage insulating material is any one of PEEK, G10 and ceramic.

15. The device for measuring the beam angle of an X-ray tube according to claim 5, characterized in that: The equipment frame (10) is provided with a horizontally extending mounting platform (101), the swing arm seat (31) is fixed on the top surface of the mounting platform (101), and a platform opening (102) penetrating from top to bottom is provided in the mounting platform (101), and the platform opening (102) allows the driving swing arm (33) to swing downward.

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