Radiation field measuring and positioning system and ray standard measuring system

Abstract

The utility model provides a radiation field measuring and positioning system and a ray standard measuring system, which can improve the measuring and positioning precision. The radiation field measuring and positioning system comprises three first linear guide rails which are fixed on a floor foundation component and extend along a first horizontal direction, and the extending direction is parallel to the direction of a radiation field wire harness; the moving platform is arranged on the three first linear guide rails through sliding blocks and can move along the first linear guide rails, and two second linear guide rails extending in the second horizontal direction are arranged on the moving platform; the measuring platform is arranged on the second linear guide rail through a sliding block and can move along the second linear guide rail, the floor foundation component comprises three supporting beams extending in the first direction, the three first linear guide rails are fixed to the three supporting beams respectively, and for each first linear guide rail, the first linear guide rail and the second linear guide rail are fixed to the measuring platform. At least two sliding blocks are arranged on the movable platform in the first direction, and a magnetic railing ruler or a grating ruler is arranged on one of the three supporting beams.

Description

TECHNICAL FIELD

[0001] The utility model relates to a ray standard measurement system (for example X ray standard measurement system), especially in the improvement of the radiation field measurement positioning system in the ray standard measurement system. BACKGROUND

[0002] The X ray standard measurement system is used for the verification, calibration and detection of X ray radiation instrument and the field such as industrial nondestructive testing.In the detection of the measured instrument, the beam limiting diaphragm of the measured instrument needs to be placed very accurately on the beam position of X ray beam, and needs to be accurately adjusted in X axis, Y axis and Z axis direction.

[0003] The radiation field measurement positioning system in the existing ray standard measurement system, for example, the ionization chamber position adjusting device (system) disclosed in the Chinese invention patent with the authorized announcement number 104091748B.The ionization chamber position adjusting device (system) includes: base and ionization chamber position adjusting device.The ionization chamber position adjusting device includes a first moving load platform, a second moving load platform and a third moving load platform.The base has a first guide rail.The first moving load platform is slid on the first guide rail, moves horizontally on the first guide rail, and has a second guide rail, the first guide rail is along the X ray main beam direction, and the second guide rail is perpendicular to the direction of the first guide rail;The second moving load platform is slid on the second guide rail and can move horizontally on the second guide rail;The third moving load platform is arranged with the second moving load platform, including vertical lifting adjustment platform, the vertical lifting adjustment platform has a clamp holding ionization chamber, for adjusting the height of the ionization chamber.The first guide rail is two parallel guide rails fixedly installed on the base by screws, and connected with the first moving load platform on the upper side through the sliding block. UTILITY MODEL CONTENTS

[0004] In the ionization chamber position adjusting device (system) disclosed in 104091748B, as described above, the first guide rail is along the X ray main beam direction, and the first moving load platform moves along the first guide rail to change the distance between the first moving load platform and the X ray source, thereby being capable of measuring different radiation intensity.However, since the length of the first guide rail is relatively short, the moving distance of the first moving load platform is also relatively short.The radiation intensity of the X ray beam decreases with the increase of the distance from the X ray source, and people hope to increase the length of the first guide rail to expand the measurement and calibration range of the ionization chamber.However, with the increase of the length of the guide rail, the positioning error of the position and angle will increase, and in order to ensure the measurement and calibration accuracy, it is necessary to ensure the positioning accuracy under the condition of the increase of the size of the equipment.

[0005] In addition, in the ionization chamber position adjusting device (system) disclosed in 104091748B, only one tertiary moving carrier platform is arranged on the secondary moving carrier platform, a vertical lifting adjusting platform is arranged on the tertiary moving carrier platform, and a clamp is arranged on the vertical lifting adjusting platform to clamp the ionization chamber for adjusting the height of the ionization chamber. However, in order to better calibrate the to-be-calibrated ionization chamber, it is desired to arrange a first platform on which a reference ionization chamber is placed and a second platform on which a to-be-calibrated ionization chamber is placed side by side along the extension direction of the second guide rail on the secondary moving carrier platform, and to be able to separately adjust the positions of the reference ionization chamber and the to-be-calibrated ionization chamber. This will cause the size of the secondary moving carrier platform to increase and the load capacity of the secondary moving carrier platform to increase, and will also cause the positioning error of the entire system to increase.

[0006] In order to solve the technical problems existing in the current radiation field measurement positioning system, the utility model provides a kind of radiation field measurement positioning system and ray standard measurement system, can be in the extension range of radiation field measurement and calibration, while guaranteeing the positioning accuracy of radiation field measurement.

[0007] In order to realize the above-mentioned purpose, the utility model includes the following technical solutions.

[0008] A kind of radiation field measurement positioning system, it is characterized in that, including: 3 first linear guides, fixed on floor base component, along the first direction of level and extension direction is parallel with radiation field beam direction;Moving platform, through slider is arranged on 3 first linear guides and can move along the first linear guide, the moving platform has 2 second linear guides along the second direction of level and extends, the second direction is perpendicular to the first direction;And measurement platform, through slider is arranged on the second linear guide and can move along the second linear guide, the measurement platform has first platform and second platform on which to-be-calibrated ionization chamber is placed along the second direction and side by side and places reference ionization chamber, wherein, the floor base component includes 3 support beams along the first direction and extends, 3 first linear guides are respectively fixed on each of 3 support beams, at least two sliders are arranged on the moving platform along the first direction for each first linear guide, one of 3 support beams is provided with magnetic grating ruler or optical grating ruler, sensor for reading the position data of the magnetic grating ruler or optical grating ruler is arranged on the moving platform.

[0009] Preferably, in the above-mentioned radiation field measurement positioning system, the first platform and the second platform are fixed on the plane of the measurement platform at the bottom, and the distance between the two platforms is fixed, the first platform has pitch, high-low and twist fine adjustment functions to ensure that the reference ionization chamber is parallel to the radiation field beam direction, and the second platform has the function of electric lifting to adapt to different structures and different sizes of to-be-calibrated ionization chambers.

[0010] Preferably, in the above-mentioned radiation field measurement positioning system, the floor foundation member is composed of profile steel structures, the support beams are provided with multiple height-adjustable feet for adjusting the horizontal position, a rack is fixed on one of the support beams, a first driving motor and a transmission gear are installed on the moving platform, the transmission gear is engaged with the rack, and the forward and backward movement of the moving platform is realized by the positive and reverse rotation of the first driving motor controlled by the first driving motor.

[0011] Preferably, in the above-mentioned radiation field measurement positioning system, a lead screw and a second driving motor are installed on the moving platform, the lead screw is parallel to the second linear guide rail, one end of the lead screw is connected to the second driving motor, and the other end of the lead screw is rotatably fixed to the moving platform, the lead screw passes through a nut-shaped part fixed to the lower surface of the measurement platform, and the movement of the measurement platform in the second direction is realized by rotating the lead screw driven by the second driving motor, and the second driving motor is a servo motor.

[0012] Preferably, in the above-mentioned radiation field measurement positioning system, the second platform includes an electrically controlled lifting device and a device-under-test stage, the electrically controlled lifting device is driven by a servo motor to rotate the lead screw to realize electric lifting, the device-under-test stage is fixed to the electrically controlled lifting device and can move up and down, and is provided with a first direction translation structure, a second direction translation structure, an electric rotation structure, and a device-under-test clamp.

[0013] In addition, the utility model provides a kind of ray standard measurement system, it is characterized by comprising: above-mentioned radiation field measurement positioning system;X-ray generating device generating X-ray beam;And the X-ray filter device that the X-ray beam generated by the X-ray generating device is filtered, wherein, the X-ray generating device and the X-ray filter device are arranged on same loading platform, relative to radiation field measurement positioning system, it is arranged at the end side of first direction, the X-ray filter device is between the X-ray generating device and the radiation field measurement positioning system, and the X light of specified wavelength range is output by filtering the X light from the X-ray generating device.

[0014] Preferably, the X-ray filter device includes two filter rotary discs symmetrically arranged in a partially overlapping manner with the X-ray beam as the center position, a plurality of filter holes are arranged along the circumferential direction of each filter rotary disc, an X light filter capable of outputting X light of a specific wavelength range is arranged in each filter hole, and the X-ray beam can be emitted after passing through the two overlapping filter holes by rotating the two filter rotary discs to simultaneously align any one filter hole of each filter rotary disc with the X-ray beam.

[0015] Effect of the Invention

[0016] The radiation field measurement positioning system and the ray standard measurement system according to the present application can expand the range of measurement and calibration of the radiation field while ensuring the positioning accuracy of the radiation field.

[0017] Specifically, the radiation field measurement positioning system according to the present application includes three first linear guides fixed to a floor base member, and a moving platform is provided on the three first linear guides via sliders and can move along the first linear guides. Even if the length of the first linear guides is increased to expand the range of measurement and calibration of the ionization chamber, the displacement of the moving platform during long-distance movement can be reduced, thereby improving the positioning accuracy of the measurement platform. Even if the size of the moving platform is increased and the load capacity thereof is increased, the support of the moving platform can be improved to suppress the deformation of the moving platform, thereby improving the positioning accuracy thereof. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a schematic perspective view showing the overall structure of the radiation field measurement positioning system according to one embodiment of the present application.

[0019] Figure 2 FIG. 2 is a diagram showing the ray standard measurement system according to one embodiment of the present application, in which (a) is a front view and (b) is a plan view.

[0020] Figure 3 FIG. 3 is a schematic perspective view showing the measurement platform in the radiation field measurement positioning system according to one embodiment of the present application.

[0021] Figure 4 FIG. 4 is a schematic perspective view showing the second platform in the radiation field measurement positioning system according to one embodiment of the present application. DETAILED DESCRIPTION

[0022] Herein the term "embodiment" is used only to describe any embodiment of the present application, and is not necessarily construed to be superior or better than other embodiments. In the performance index test of the embodiments of the present application, unless otherwise specified, the conventional test method in the art is adopted. It should be understood that the terms described in the present application are only used to describe the specific embodiments, and are not used to limit the disclosure of the present application.

[0023] Unless otherwise specified, the technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which the present application pertains; and the test methods and technical means not specifically noted in the present application refer to the experimental methods and technical means commonly used by those skilled in the art.

[0024] In this document, including in the claims, the conjunctions, such as "comprise", "include", "have", "contain", "involve", "accommodate" and the like are to be understood as open-ended, i.e. as meaning "including but not limited to". Only the conjunctions "consist of" and "consist only of" are closed conjunctions.

[0025] For a better understanding of the present application, numerous specific details are given in the following detailed description. The person skilled in the art understands that the present application can also be implemented without certain specific details. In the examples, methods, means, instruments, devices and the like that are well known to the person skilled in the art are not described in detail in order to highlight the gist of the present application.

[0026] The technical features disclosed in the embodiments of the present application can be combined arbitrarily without conflict, and the technical solutions obtained by the combination belong to the disclosure of the embodiments of the present application. It should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like described herein indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the technical features and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore cannot be understood as a limitation on the present application, unless the context contradicts. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance, unless the context contradicts.

[0027] The specific embodiments of the present application are described below to facilitate understanding of the present application by those skilled in the art, but it should be clear that the present application is not limited to the scope of the specific embodiments. For those skilled in the art, any changes within the spirit and scope of the present application as defined in the appended claims are obvious, and all utility model creations utilizing the concept of the present application are within the scope of protection.

[0028] The specific embodiments and examples of the present application are described below with reference to the accompanying drawings.

[0029] Figure 1 To show a schematic perspective view of the overall structure of the radiation field measurement positioning system 2 of an embodiment of the present application.

[0030] Figure 2The diagram illustrates a radiation standard measurement system 1 according to one embodiment of the present invention, wherein (a) is a front view and (b) is a top view. This radiation standard measurement system 1 is a multi-detector simultaneous calibration system, capable of performing measurements at the same working position by switching the positions of the ionization chamber to be calibrated and the reference ionization chamber. Figure 2 The X-ray standard measurement system 1 shown includes Figure 1 The radiation field measurement and positioning system 2 shown also includes an X-ray generator 10 (referred to as an X-ray machine) and an X-ray filter 11.

[0031] like Figure 1 and Figure 2 As shown, one embodiment of the radiation field measurement and positioning system 2 of this utility model includes: three first linear guide rails 21, fixed on the ground foundation component 40, along a horizontal first direction ( Figure 2 The moving platform 22 extends in the left-right direction and its extension direction is parallel to the direction of the radiation field beam; the moving platform 22 is mounted on the first linear guide rail 21 by a slider and can move along the first linear guide rail 21, the moving platform 22 having a second direction along the horizontal direction ( Figure 2 Two second linear guide rails 23 extending in the vertical direction (as shown in section (b)) are perpendicular to the first direction; and a measuring platform 24 is movable along the second linear guide rails 23 by means of a slider mounted on the second linear guide rails 23. A first platform 25 for placing a reference ionization chamber is arranged side-by-side on the measuring platform 24 along the second direction. Figure 1 and Figure 2 The image also shows a reference ionization chamber placed on the first platform, while the first platform without a reference ionization chamber is shown in the image. Figure 3 As shown in the figure, a second platform 26 is used to place the ionization chamber to be calibrated. The landing base component 40 includes three support beams 41 extending along the first direction. Three first linear guide rails 21 are respectively fixed on each of the three support beams. For each first linear guide rail 21, at least two sliders (not shown) are arranged on the moving platform 22 along the first direction. A magnetic grating ruler or optical grating ruler (not shown) is arranged on one of the three support beams. A sensor (not shown) is arranged on the moving platform 22 to read the position data of the magnetic grating ruler or optical grating ruler, so as to realize the precise positioning of the moving platform 22 in the first direction.

[0032] like Figure 2 As shown, the X-ray generating device 10 and the X-ray filtering device 11 are mounted on the same optical platform, positioned at one end relative to the radiation field measurement and positioning system in the first direction. Figure 2X-ray filtering device 11 is located between X-ray generating device 10 and radiation field measurement positioning system 1, filters X-rays from X-ray generating device 10 to output X-rays of a specified wavelength range. Specifically, X-ray filtering device 11 includes two filtering turntables that are symmetrically arranged in a partially overlapping manner with the X-ray beam as the center position. Although the structure of X-ray filtering device 11 is not shown in detail in Figure 2 each filtering turntable is provided with a plurality of filter holes along the circumference thereof, and each filter hole is provided with an X-ray filter capable of outputting X-rays of a specific wavelength range. By rotating the two filtering turntables, any one filter hole of each of the two filtering turntables can be aligned with the X-ray beam at the same time, and the X-ray beam can be emitted after passing through the two overlapping filter holes. With such a double-disc filtering structure, the number of radiation qualities is greatly increased, meeting the long-term planning of the laboratory to establish multiple series of radiation qualities.

[0033] Figure 3 A schematic perspective view of the measurement platform 24 in the radiation field measurement positioning system 2 of one embodiment of the present application is shown. As shown in Figure 3 in the radiation field measurement positioning system 2 of one embodiment of the present application, the first platform 25 and the second platform 26 are fixed to the plane of the measurement platform 24 at the bottom, and the distance between the two platforms is fixed. The first platform 25 has pitch, elevation, and roll fine adjustment functions to ensure that the reference ionization chamber can be parallel to the direction of the radiation field beam. The second platform 26 has a motorized lifting function to adapt to ionization chambers of different structures and different sizes.

[0034] Returning to Figure 1 and Figure 2 . As shown in Figure 1 in the above radiation field measurement positioning system 2, the floor base member 40 is composed of profile steel structure. The support beams 41 are provided with a plurality of adjustable height footings 42 to adjust the level. As shown in Figure 2 one of the three support beams 41 Figure 2 is fixed with a rack. The moving platform 22 is provided with a first drive motor and a transmission gear, and the transmission gear is engaged with the rack. The first drive motor is controlled to perform forward and reverse rotation to realize the forward and backward movement of the moving platform. The first drive motor is a servo motor with an encoder.

[0035] As shown in Figure 1As shown, in the radiation field measurement and positioning system 2 described above, a lead screw and a second drive motor are installed on the moving platform 22. The lead screw is parallel to the second linear guide rail 23, with one end connected to the second drive motor and the other end rotatably fixed to the moving platform 22. The lead screw passes through a nut-shaped component fixed to the lower surface of the measurement platform, thereby driving the lead screw to rotate through the second drive motor to achieve the movement of the measurement platform 24 in the second direction. The second drive motor is a servo motor.

[0036] Figure 4 This is a schematic perspective view illustrating the second platform 26 in a radiation field measurement and positioning system 2 according to one embodiment of the present invention. Figure 4 As shown, in the aforementioned radiation field measurement and positioning system 2, the second platform 26 includes an electrically controlled lifting device and a calibration equipment platform. Specifically, the electrically controlled lifting device includes a first fixed base, a second fixed base, and a lifting platform. Electric lifting is achieved using a servo motor-driven lead screw rotation structure, enabling the lifting platform and the calibration equipment platform to move up and down synchronously. The specific structure of the electrically controlled lifting device can, for example, adopt the structure disclosed in 106548919B. The calibration equipment platform is equipped with a first-direction translation structure, a second-direction translation structure, an electrically rotating structure, and a calibration equipment clamp. The specific structure of the calibration equipment clamp can, for example, adopt the structure disclosed in 104091748B.

[0037] Although not illustrated in the accompanying drawings, it is preferred that the above-described radiation field measurement and positioning system further includes an end laser and a side laser, wherein the end laser is disposed at the end of the first linear guide rail. Figure 2 The left end of the first linear guide rail is capable of emitting a first positioning laser along the first direction directly facing the radiation field beam. The side-end laser is disposed to the side of the first linear guide rail and can change its position in the first direction, and can emit a second positioning laser along the second direction. More preferably, the end laser emits a laser beam with a cross-shaped cross section.

[0038] When the instrument to be measured is present, turn on the end laser and the side laser, place the instrument to be measured on the measurement platform, and adjust the position of the measurement platform so that the aperture of the instrument to be measured is located at the center point of the crosshair of the first positioning laser emitted by the end laser along the direction of the radiation field beam (e.g., an X-ray beam), and at a specific distance on the laser line of the second positioning laser emitted by the side laser along a horizontal (perpendicular to the direction of the radiation field beam) second direction. The position of the crosshair of the end laser is the center position of the X-ray beam, and the position of the laser line of the second positioning laser is the measurement position at the specific distance.

[0039] The working process of the radiation field measurement positioning system and the ray standard measurement system is explained below.

[0040] Preliminary installation and fixation: the reference ionization chamber is placed on the first platform 25, i.e., the reference ionization chamber measurement platform, and the precise positioning of the reference ionization chamber is realized by the end laser, the laser cross center of which has been adjusted to be the X-ray main beam center, and the height and horizontal position of the ionization chamber are finely adjusted to ensure that the laser cross center can be shot from the X-ray light outlet hole center of the reference ionization chamber into the X-ray light inlet hole center of the ionization chamber, and the placement of the reference ionization chamber is completed.

[0041] Then, the to-be-calibrated ionization chamber is clamped by the clamp on the second platform 26 and is fixed on the to-be-calibrated ionization chamber measurement platform. The laser cross center is aligned with the sensitive volume center (e.g., the diaphragm) of the to-be-calibrated ionization chamber by moving the measurement platform along the second linear guide rail 23 and adjusting the height of the to-be-calibrated ionization chamber measurement platform, and the placement of the to-be-calibrated ionization chamber is completed.

[0042] When working: the X-ray machine is turned on, the additional filter disc is rotated to output X-rays of a specified wavelength range, the moving platform is controlled to move to a specified working position along the first direction, i.e., the radiation field beam direction, the measurement platform 24 is controlled to move along the second linear guide rail 23 so that the reference ionization chamber reaches the working position, the reference ionization chamber is turned on, the measurement system starts to measure the count, the measurement is completed, and the data is saved. Then, the measurement platform 24 is moved along the second linear guide rail 23, the to-be-calibrated ionization chamber reaches the working position, the measurement is started, the count is completed, and the data is saved.

[0043] Then, the parameters of the X-ray machine are changed, the filter disc is rotated to output X-rays of the next wavelength range, and the above operation is repeated until all the specified measurements are completed. The measurement data of the reference ionization chamber and the measurement data of the to-be-calibrated ionization chamber are processed, so that a calibration factor can be given to the to-be-calibrated ionization chamber according to the reference value, and the calibration work is completed.

[0044] The radiation field measurement positioning system 2 of the utility model needs to repeatedly move and position the reference ionization chamber and the to-be-calibrated ionization chamber during work, and therefore the positioning accuracy in this process is crucial to ensure the measurement accuracy. The following specific embodiment is used to explain how the radiation field measurement positioning system of the utility model realizes the technical effect of "being able to expand the range of the radiation field measurement and calibration while ensuring the positioning accuracy of the radiation field".

[0045] The following refers to Figure 1 The embodiment of the radiation field measurement positioning system 2 of the utility model is explained.

[0046] The radiation field measurement positioning system 2 of one embodiment of the utility model, its structure is as shown in the figure, the repeated description is omitted here. Figures 1 to 4

[0047] In this embodiment, the length of the first linear guide rail 21 in the direction parallel to the light path is increased to 5m, the first linear guide rail 21 is supported by three support beams 41, and is matched with a magnetic grating ruler to ensure positioning accuracy, and more than ten foot screws are distributed to facilitate the adjustment of the horizontal when the guide rail is installed. For each first linear guide rail 21, at least two sliders are arranged on the moving platform 22 in the first direction, and in this embodiment, three sliders are arranged on the moving platform 22 for each first linear guide rail 21, so that the moving platform 22 can be stably supported, and the direction of the platform of the moving platform 22 remains unchanged when moving along the first linear guide rail 21. The length of the second linear guide rail 23 is increased to 1.5m, which can meet the demand of large-scale measurement platform 24, that is, ensure the required stroke of the measurement platform 24 moving in the second direction under the condition of large-scale measurement platform 24.

[0048] On the measurement platform 24, two platforms are arranged in the direction perpendicular to the light path, that is, the second direction, the first platform 25 is a special platform for the reference ionization chamber (such as a free air ionization chamber), which has fine adjustment functions such as pitch, height, and swing (both pitch and swing are composed of rotating bearings and adjusting handwheels, the bearing is the center of the rotating radius, and the swing and pitch can be adjusted by rotating the handwheel), so as to ensure that the free air ionization chamber is completely parallel to the light path, and unnecessary correction is avoided due to non-parallelism, and the second platform 26 is a calibrated instrument platform, which has the functions of electric lifting and electric rotation, which facilitates the test of the angle response or other performance of the related instruments and equipment, and can adapt to different structures and different sizes of calibrated instruments (to be calibrated ionization chamber).

[0049] The first linear guide rail 21 is fixed on the floor base member 40, and the rail length is 5000mm. The transmission mechanism adopts a gear and rack mode, and a driving motor (servo motor) is arranged on the moving platform 22, which drives the moving platform 22 to move in the first direction (X-axis direction) through the servo motor. The movement is stable and the positioning is accurate. Specifically, the servo motor is given a task by the control software, the servo motor drives the motion mechanism to reach the corresponding position, the magnetic grating ruler reads the corresponding position signal, and finally the servo motor is fine-tuned and corrected. In this embodiment, the servo motor adopts Panasonic servo MHMF082L1A1, and the rack adopts a helical fine milling rack with a model of CHTM02020-DIN8.

[0050] ​The movement of the measuring platform 24 in the second direction (Y-axis direction, perpendicular to the ray beam and parallel to the ground direction) adopts a screw drive mode, so as to take into account the use of other detectors, which is realized by rotating a servo motor driven screw. The second platform 26 includes an electric control lifting device and a device to be calibrated carrier, and the movement in the height direction (Z-axis direction, perpendicular to the ray beam and the ground direction) adopts an electric control lifting device, which is realized by rotating a servo motor driven screw to realize electric lifting.

[0051] The guide rail positioning characteristic test is to fix the laser interferometer to the platform to be measured (the laser interferometer mirror is close to the platform to be measured, the laser interferometer is opposite to the mirror, the moving distance is measured according to the laser signal emitted and received by the laser interferometer, and the laser interferometer is produced by Kode Digital Technology Co., Ltd.), and the moving platform 22 is moved forward by a certain distance and then returned, and the distance between the original position and the returned position of the moving platform 22 is measured, so that the return difference can be obtained. The measuring rod (produced by Chengdu Chengliang Tool Group Co., Ltd.) is placed at the zero position of each axis of the guide rail, and the moving platform 22 is returned after running to the zero limit, and the distance between the original position and the returned position is measured, so that the return difference of the guide rail positioning is obtained. The measurement results are shown in Table 2-1.

[0052] Table 2-1: Return difference of guide rail in each direction (mm)

[0053] Serial number X axis Y axis Z axis 1 -0.003 -0.008 -0.011 2 -0.014 -0.005 -0.021 3 -0.008 -0.008 -0.032 4 -0.022 -0.015 -0.015 5 -0.021 -0.017 -0.003 Range 0.019 0.012 0.029

[0054] According to the above measurement results, it can be seen that the average distance error caused by the return difference of the guide rail in the tested working section is less than 0.03 mm.

[0055] The positioning point distance is repeatedly measured at intervals of 200 mm from zero to 1400 mm in the X-axis direction, and the positioning point distance is repeatedly measured from zero to 350 mm in the Y-axis direction, and the repeated positioning accuracy is calculated according to the following formula.

[0056]

[0057] Wherein:

[0058] RDP represents the repeated positioning accuracy;

[0059] X i represents the i-th positioning measurement result;

[0060] X m represents the average value of the positioning measurement results at this position;

[0061] n represents the number of measurements.

[0062] The repeated positioning accuracy measurement results of the X and Y axes are shown in Table 2-2 and Table 2-3, the repeated positioning accuracy of the X axis is better than 0.01 mm, and the repeated positioning accuracy of the Y axis is better than 0.02 mm.

[0063] Table 2-2 repeated positioning accuracy measurement results of the X axis

[0064]

[0065]

[0066] Table 2-3 repeated positioning accuracy measurement results of the Y axis

[0067]

[0068] As described above, the radiation field measurement positioning system 2 and the ray standard measurement system 1 of the utility model can expand the range of the radiation field measurement and calibration while ensuring the positioning accuracy of the radiation field.

[0069] Specifically, the radiation field measurement positioning system 2 of the utility model comprises three first linear guides 21 fixed on the floor base member 40, and a moving platform 22 is arranged on the three first linear guides 21 through a sliding block and can move along the first linear guides 21. Even if the length of the first linear guide 21 is increased to expand the range of the ionization chamber measurement and calibration, the displacement of the moving platform during long distance movement can be reduced, thereby improving the positioning accuracy of the measurement platform 24. Moreover, even if the size of the moving platform is increased and its load capacity is increased, the support of the moving platform can be improved to inhibit the deformation of the moving platform 22, thereby improving the positioning accuracy.

Claims

1. A radiation field measurement positioning system, characterized in that, comprising: three first linear guides fixed on a floor base member and extending in a horizontal first direction parallel to the direction of a radiation field beam; a moving platform capable of moving along the first linear guides by being provided with sliders on the three first linear guides, the moving platform having two second linear guides extending in a horizontal second direction perpendicular to the first direction; and a measurement platform capable of moving along the second linear guides by being provided with sliders on the second linear guides, the measurement platform having a first platform for placing a reference ionization chamber and a second platform for placing a to-be-calibrated ionization chamber arranged side by side in the second direction; wherein the floor base member comprises three support beams extending in the first direction, and the three first linear guides are respectively fixed on each of the three support beams, for each of the first linear guides, at least two sliders are arranged on the moving platform in the first direction, one of the three support beams is provided with a magnetic grating ruler or an optical grating ruler, and a sensor for reading position data of the magnetic grating ruler or the optical grating ruler is arranged on the moving platform.

2. The radiation field measurement positioning system according to claim 1, characterized in that: the first platform and the second platform are fixed at the bottom of the measurement platform and have a fixed distance, the first platform is provided with pitch, roll and yaw fine adjustment functions to ensure that the reference ionization chamber is parallel to the direction of the radiation field beam, the second platform is provided with an electrically controlled lifting function to adapt to different structures and sizes of the to-be-calibrated ionization chamber.

3. The radiation field measurement positioning system according to claim 1 or 2, characterized in that: the floor base member is composed of profile steel structures, and the support beams are provided with multiple height-adjustable feet to adjust the horizontal position, one of the support beams is fixed with a rack, a first driving motor and a transmission gear are installed on the moving platform, the transmission gear is engaged with the rack, and the forward and backward movement of the moving platform is realized by controlling the first driving motor to perform forward and reverse rotation, the first driving motor is a servo motor with an encoder.

4. The radiation field measurement positioning system according to claim 1 or 2, characterized in that: a lead screw and a second driving motor are installed on the moving platform, the lead screw is parallel to the second linear guides, one end of the lead screw is connected to the second driving motor, and the other end of the lead screw is rotatably fixed to the moving platform, the lead screw passes through a nut-shaped part fixed to the lower surface of the measurement platform, and the movement of the measurement platform in the second direction is realized by rotating the lead screw driven by the second driving motor, the second driving motor is a servo motor.

5. The radiation field measurement positioning system according to claim 1 or 2, characterized in that: the second platform comprises an electrically controlled lifting device and a device carrier, the electrically controlled lifting device is driven by a servo motor to rotate the lead screw to realize electrically controlled lifting. The calibrated device stage is fixed on the electric control lifting device and can move up and down, and is provided with a first direction translation structure, a second direction translation structure, an electric rotation structure and a calibrated device clamp.

6. A system for measuring a radiation standard, characterized in that Comprise: The radiation field measurement positioning system according to any one of claims 1 to 5; X-ray generating device for generating X-ray beam; And X-ray filtering device for filtering the X-ray beam generated by the X-ray generating device, Wherein, the X-ray generating device and the X-ray filtering device are arranged on the same placement platform, and are arranged at one end side of the first direction relative to the radiation field measurement positioning system, The X-ray filtering device is located between the X-ray generating device and the radiation field measurement positioning system, and filters the X-ray from the X-ray generating device to output X-ray of a specified wavelength range.

7. The ray standard measurement system according to claim 6, wherein The X-ray filtering device comprises two filter rotating discs which are symmetrically arranged in a partially overlapping manner with the X-ray beam as the center position, Each of the filter rotating discs is provided with a plurality of filter holes along the circumferential direction thereof, and each of the filter holes is provided with an X-ray filter capable of outputting X-ray of a specific wavelength range, By rotating the two filter rotating discs, any one filter hole of each of the two filter rotating discs can be aligned with the X-ray beam at the same time, so that the X-ray beam can be emitted after passing through the two overlapping filter holes.

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