A microchannel plate collimator ultraviolet point light source detection device and detection method

Abstract

The present invention discloses a microchannel plate collimator ultraviolet point light source detection device and detection method. The detection device includes an ultraviolet light source, a stage, a collimator, and an ultraviolet camera. The collimator is disposed on the stage, and the ultraviolet light source and the ultraviolet camera are disposed in front of and behind the collimator, respectively. The ultraviolet light source, the collimator, and the ultraviolet camera are located on the same axis. The present invention uses a point light source for irradiation, and a single measurement can obtain the measurement result of the microchannel plate, avoiding a large number of multiple and long-term test operations. In addition, the light source distance is short, the particle flux is large, and the single measurement time is short, effectively improving the efficiency of the detection operation. In addition, ultraviolet rays are used instead of X-rays, avoiding the radiation risk brought by X-rays and reducing the risk of human exposure.

Description

Technical Field

[0001] The present invention relates to the technical field of ultraviolet imaging devices, and in particular to a microchannel plate collimator ultraviolet point light source detection device and a detection method. Background Art

[0002] A capillary lead glass microchannel plate (MCP) is a lead glass panel covered with an array of tiny through-holes. It is typically used as an X-ray optical component and is also known as a capillary collimator. Each MCP must be tested before use to ensure its parameters meet the required specifications.

[0003] Existing methods for detecting microchannel plates all use parallel X-rays incident at different angles for detection. However, these detection methods have many technical problems. First, due to the strong radiation of X-rays, the detection device needs to be shielded when using X-rays for detection. Moreover, the radiation characteristics of X-rays and the shielding device make it difficult for operators to operate efficiently, resulting in high costs and low efficiency. Secondly, existing X-ray detection devices are beam detection devices, which have the disadvantages of being large and expensive. Finally, each angle needs to be counted for a long enough time or a sufficient number of counts must be accumulated during detection to ensure the accuracy of the results. Therefore, multiple repeated measurements at multiple angles are required, which is time-consuming and more susceptible to X-ray radiation due to long-term operation.

[0004] The present invention provides a microchannel plate collimator ultraviolet point light source detection device and detection method to solve the above problems. Summary of the Invention

[0005] The present invention provides a microchannel plate collimator ultraviolet point light source detection device and detection method, which utilizes a point-shaped ultraviolet light source to realize the detection of the microchannel plate, and has the advantages of high efficiency and low cost.

[0006] The technical solution adopted by the present invention to solve the above technical problems is:

[0007] A microchannel plate collimator ultraviolet point light source detection device, comprising an ultraviolet light source, a stage, a collimator, and an ultraviolet camera, wherein the collimator is disposed on the stage, the ultraviolet light source and the ultraviolet camera are disposed in front of and behind the collimator, respectively, and the ultraviolet light source, the collimator, and the ultraviolet camera are located on the same axis;

[0008] The ultraviolet light source emits a point light source, and the ultraviolet camera is used to receive the ultraviolet light and form an image. The distance between the ultraviolet light source and the ultraviolet camera is L, and the distance L is determined by the following formula:

[0009] tg(θ)=d / L

[0010] Where θ is the angular resolution of the system measurement, and d is the pixel size of the UV camera.

[0011] Furthermore, the detection indicators of the collimator include pointing accuracy, opening area ratio and field of view, and the pointing accuracy includes hole-hole parallelism and hole-surface perpendicularity.

[0012] Furthermore, the imaging result of the ultraviolet camera is a circle whose brightness gradually darkens from the center to the outside.

[0013] Furthermore, a through hole is provided on the stage, and the collimator is provided at the through hole of the stage; the stage has two-dimensional movements of horizontal rotation and vertical pitch.

[0014] Furthermore, the ultraviolet light emitted by the ultraviolet light source has a wavelength range of 288-338 nm.

[0015] A detection method for a microchannel plate collimator ultraviolet point light source detection device comprises the following steps:

[0016] S1, system preparation: according to the measurement accuracy requirements, adjust the relative positions of the UV light source, collimator and UV camera, and ensure that they are on the same axis. After the adjustment is completed, install the collimator;

[0017] S2, connecting the system: connecting the UV light source, stage and UV camera to the test system;

[0018] S3, performing a test: operating the UV light source and the UV camera, and the UV camera receives the UV light and forms an image;

[0019] S4, result conversion: convert the virtual original image imaged by the ultraviolet camera to obtain a three-dimensional PicC brightness distribution map, obtain the parameter indicators of the collimator based on the three-dimensional PicC brightness distribution map, and compare them with the expected values.

[0020] Furthermore, in step S4, the spatial coordinates in the horizontal direction of the PicC brightness distribution three-dimensional graph are the incident light inclination angle of the X-ray; the peak value of the PicC brightness distribution three-dimensional graph is the opening area ratio parameter of the collimator; the angle value corresponding to the position of the peak value of the PicC brightness distribution three-dimensional graph is the pointing accuracy parameter of the collimator, and the half-width height of the peak value of the PicC brightness distribution three-dimensional graph is the field of view parameter of the collimator.

[0021] The beneficial effects of the present invention are as follows:

[0022] Using a point light source for illumination, the measurement results of the microchannel plate can be obtained in one measurement, avoiding a large number of repeated and long test operations. In addition, the light source distance is short, the particle flux is large, and the single measurement time is short, which effectively improves the detection efficiency.

[0023] Using ultraviolet light instead of X-rays avoids the radiation hazards brought by X-rays and reduces the risk of personnel exposure;

[0024] The present invention has a simple structure, convenient operation, high detection accuracy, higher safety and lower cost, and effectively improves operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the device structure of the present invention;

[0026] Figure 2 is a schematic diagram of a virtual original image of the present invention;

[0027] Figure 3 Schematic diagram of the three-dimensional brightness distribution of PicC of the present invention.

[0028] Reference numerals: 1-ultraviolet light source, 2-stage, 3-collimator, 4-ultraviolet camera. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] In the description of this patent, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings. They are only for the convenience of describing this patent and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this patent.

[0031] The existing X-ray detection of microchannel plate collimators is due to their application in detection satellites that detect X-rays. In order to ensure accurate and reliable results, the existing technologies all use X-rays to detect microchannel plate collimators. The existing method of detecting the X-ray performance of microchannel plate collimators is to use parallel X-ray light incident at different angles. However, parallel X-ray light is difficult to obtain. Therefore, the method adopted by the existing technology is to extend the optical path L. The beam line lengths of the currently used beam detection devices are 500m, 120m, and 103m respectively. However, when analyzing the optical characteristics of the microchannel plate collimator, it was found that the microchannel plate collimator has a high absorption rate for ultraviolet rays. Within the sensitive wavelength range of the microchannel plate collimator to ultraviolet rays, the light absorption rate is greater than 97%. Therefore, ultraviolet light is used to detect the microchannel plate collimator to improve detection efficiency and ensure the accuracy of the detection results to meet the use requirements.

[0032] like Figure 1 As shown, a microchannel plate collimator ultraviolet point light source detection device includes an ultraviolet light source 1, a stage 2, a collimator 3 and an ultraviolet camera 4, wherein the collimator 3 is arranged on the stage 2, and the ultraviolet light source 1 and the ultraviolet camera 4 are respectively arranged in front and behind the collimator 3, and the ultraviolet light source 1, the collimator 3 and the ultraviolet camera 4 are located on the same axis.

[0033] like Figure 2 As shown, after ultraviolet irradiation, the ultraviolet rays irradiated on the collimator 3 body are absorbed, and the ultraviolet rays incident into the through hole of the collimator 3 will pass through the through hole and be received by the ultraviolet camera 4 to display the image. Moreover, due to the different irradiation angles of the point-shaped ultraviolet rays, the incident angles of the ultraviolet rays are different when entering the through hole, resulting in the ultraviolet rays being reflected different times in the through hole. The more reflections there are, the lower the intensity of the ultraviolet light, which in turn leads to different imaging effects of the ultraviolet camera 4, and finally different brightness displayed on the ultraviolet camera 4, thereby obtaining the final image of the ultraviolet camera 4, and converting the image to obtain the detection result of the collimator 3.

[0034] The ultraviolet light source 1 is a micro-focus ultraviolet light source for emitting a point light source. The ultraviolet camera 4 is used to receive ultraviolet light and form an image. The distance between the ultraviolet light source 1 and the ultraviolet camera 4 is L, and the distance L is determined by the following formula:

[0035] tg(θ)=d / L

[0036] Wherein, θ is the angular resolution of the system measurement, and d is the pixel size of the UV camera 4.

[0037] In a preferred embodiment of the present invention, d=10um, L=332mm, and θ=6.4arcsec. Compared with a 100-meter-long beam line device, the optical path length of the device of the present invention is 331.8mm, which greatly shortens the optical path distance, and the detection accuracy is 6.4 arc seconds, which meets the measurement requirements.

[0038] Furthermore, the inspection indicators of the collimator 3 include pointing accuracy, aperture area ratio, and field of view. The pointing accuracy includes hole-hole parallelism and hole-surface perpendicularity. Hole-hole parallelism is the degree of parallelism between the microholes, with an expected value of 0". Hole-surface perpendicularity is the degree of perpendicularity between the microholes and the mounting surface, with an expected value of 90°. The aperture area ratio is the ratio of the microhole area to the total area. The field of view is the area that can be effectively observed, which is the field of view angle θ.

[0039] Furthermore, the imaging result of the ultraviolet camera 4 is a circle whose brightness gradually darkens from the center to the outside.

[0040] Furthermore, a through hole is provided on the stage 2, and the collimator 3 is provided at the through hole of the stage 2; the stage 2 has two-dimensional movements in horizontal rotation and vertical pitch.

[0041] Furthermore, the wavelength range of the ultraviolet light emitted by the ultraviolet light source 1 is 288-338 nm, and the transmittance of the collimator 3 to ultraviolet light in this wavelength range is less than 2%, which can meet the measurement requirements.

[0042] A detection method for a microchannel plate collimator ultraviolet point light source detection device comprises the following steps:

[0043] S1, system preparation: according to the measurement accuracy requirements, adjust the relative positions of the UV light source 1, collimator 3 and UV camera 4, and ensure that they are located on the same axis. After the adjustment is completed, install the collimator 3;

[0044] S2, connecting the system: connecting the UV light source 1, the stage 2 and the UV camera 4 to the test system;

[0045] S3, performing a test: operating the ultraviolet light source 1 and the ultraviolet camera 4, and the ultraviolet camera 4 receives the ultraviolet light and forms an image;

[0046] S4, result conversion: convert the virtual original image imaged by the ultraviolet camera 4 to obtain a three-dimensional PicC brightness distribution map, obtain parameter indicators of the collimator 3 based on the PicC brightness distribution three-dimensional map, and compare them with expected values.

[0047] like Figure 3As shown, further, in step S4, the spatial coordinate of the PicC brightness distribution three-dimensional graph in the horizontal direction is the incident light inclination angle of the X-ray; the peak value of the PicC brightness distribution three-dimensional graph is the opening area ratio parameter of the collimator 3; the angle value corresponding to the position of the peak value of the PicC brightness distribution three-dimensional graph is the pointing accuracy parameter of the collimator 3, and the half-width height of the peak value of the PicC brightness distribution three-dimensional graph is the field of view parameter of the collimator 3.

[0048] Furthermore, in step S3, the operation of eliminating the systematic error of pointing accuracy is as follows: first measure once to obtain the imaging result, and obtain the center coordinate A, then rotate 180° along the mounting surface, measure again to obtain the imaging result, and obtain the center coordinate B, where (A+B) / 2 is the systematic error; (AB) / 2 is the absolute pointing accuracy value of the collimator 3.

[0049] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description. It is intended that all variations within the meaning and range of equivalents of the claims be embraced herein, and any reference signs in the claims should not be construed as limiting the claims to which they relate.

Claims

1. A detection method for a microchannel plate collimator ultraviolet point light source detection device, characterized in that: The detection device comprises an ultraviolet light source (1), a stage (2), a collimator (3) and an ultraviolet camera (4), wherein the collimator (3) is arranged on the stage (2), the ultraviolet light source (1) and the ultraviolet camera (4) are arranged in front of and behind the collimator (3), respectively, and the ultraviolet light source (1), the collimator (3) and the ultraviolet camera (4) are located on the same axis; The parameter indicators of the collimator (3) include pointing accuracy, opening area ratio and field of view, and the pointing accuracy includes hole-hole parallelism and hole-surface perpendicularity; The detection method includes the following steps: S1, system preparation: according to the measurement accuracy requirements, adjust the relative positions of the UV light source (1), the collimator (3) and the UV camera (4), and ensure that they are located on the same axis. After the adjustment is completed, install the collimator (3); S2, connecting the system: connecting the UV light source (1), the stage (2) and the UV camera (4) to the test system; S3, performing a test: operating the ultraviolet light source (1) and the ultraviolet camera (4), wherein the ultraviolet light source (1) emits a point light source, and the ultraviolet camera (4) receives the ultraviolet light and forms an image; S4, result conversion: converting the virtual original image imaged by the ultraviolet camera (4) to obtain a three-dimensional map of PicC brightness distribution, obtaining the parameter index of the collimator (3) based on the three-dimensional map of PicC brightness distribution, and comparing it with the expected value; In step S4, the spatial coordinates in the horizontal direction of the PicC brightness distribution three-dimensional graph are the incident light inclination angle of the ultraviolet light; the peak value of the PicC brightness distribution three-dimensional graph is the aperture area ratio parameter of the collimator (3); the angle value corresponding to the position of the peak value of the PicC brightness distribution three-dimensional graph is the pointing accuracy parameter of the collimator (3), and the half-width height of the peak value of the PicC brightness distribution three-dimensional graph is the field of view parameter of the collimator (3).

2. The detection method of a microchannel plate collimator ultraviolet point light source detection device according to claim 1, characterized in that: The distance between the ultraviolet light source (1) and the ultraviolet camera (4) is L, and the distance L is determined using the following formula: tg(θ)=d / L Where θ is the angular resolution of the system measurement and d is the pixel size of the UV camera (4).

3. The detection method of a microchannel plate collimator ultraviolet point light source detection device according to claim 1, characterized in that: The imaging result of the ultraviolet camera (4) is a circle whose brightness gradually darkens from the center to the outside.

4. The detection method of a microchannel plate collimator ultraviolet point light source detection device according to claim 1, characterized in that: A through hole is provided on the stage (2), and the collimator (3) is provided at the through hole of the stage (2); the stage (2) has two-dimensional movements of horizontal rotation and vertical pitch.

5. The detection method of a microchannel plate collimator ultraviolet point light source detection device according to claim 1, characterized in that: The ultraviolet light emitted by the ultraviolet light source (1) has a wavelength range of 288-338 nm.

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