A combined X-ray monochromatic focusing system

Abstract

The present invention discloses a combined X-ray monochromatic converging system, comprising an X-ray generator and a plurality of focusing units, wherein one of the focusing units comprises a polycapillary X-ray parallel beam lens, a monochromator, and a polycapillary X-ray focuser connected in sequence; the X-ray generator is a point light source, radiating X-rays outward from the point as a source; the polycapillary X-ray parallel beam lenses of the plurality of focusing units are arranged on the optical path radiating outward from the X-ray generator, and the polycapillary X-ray focusers of the plurality of focusing units have a converging final focus. The combined X-ray monochromatic converging system of the present invention can be provided with a plurality of focusing units by using an X-ray light source with a large exit angle. The plurality of focusing units ultimately have a converging microfocus, which has the excellent performance of high X-ray utilization and higher brightness of the focused focal spot compared to other X-ray monochromatic focusing devices.

Description

Technical Field

[0001] The present invention relates to the technical field of optical control, and in particular to a combined X-ray monochromatic focusing optical system. Background Art

[0002] Since their discovery by German physicist W.K. Roentgen in 1895, X-rays have been a powerful tool for exploring the microscopic world, with widespread applications in medical imaging, industrial testing, physics, chemistry, and biological analysis. In practical applications, the most commonly used X-rays are generated by X-ray tubes. The X-rays generated by X-ray tubes are polychromatic and divergent. However, in the field of X-ray spectroscopy, especially micro-area X-ray analysis, a monochromatic focused X-ray beam is often required. Currently, the most commonly used X-ray focusing monochromators are X-ray multilayers or bent crystal monochromators. Both X-ray multilayers and bent crystal monochromators require sophisticated manufacturing technology, making them relatively expensive and difficult to widely promote. Polycapillary X-ray lenses are also a commonly used X-ray converging device. They are inexpensive, making them conducive to widespread adoption, but they lack monochromatic properties. Summary of the Invention

[0003] The present invention addresses the above-mentioned issues by providing a combined X-ray monochromator and convergent system. This system can simultaneously monochromatize and converge the divergent polychromatic X-rays generated by conventional laboratory X-ray tubes. This system can improve the analytical performance of samples used in X-ray microfluorescence analysis devices. The system is also inexpensive and readily available.

[0004] In order to achieve the above object, the technical solution of the present invention is:

[0005] A combined X-ray monochromatic convergence system comprises an X-ray generator and several focusing units, wherein one of the focusing units comprises a polycapillary X-ray parallel beam lens, a monochromator, and a polycapillary X-ray focuser connected in sequence; the focal spot of the X-ray generator is located at the front focal spot of the polycapillary X-ray parallel beam lens; the X-ray generator is a point light source, radiating X-rays outward from the point as a source; the polycapillary X-ray parallel beam lenses of several focusing units are arranged on the optical path of the X-ray generator radiating outward, and the polycapillary X-ray focusers of several focusing units have a converging final focus.

[0006] As an improvement to the above technical solution, the target material of the X-ray tube is any one of copper, molybdenum, silver or tungsten.

[0007] As an improvement to the above technical solution, the X-ray generator is an X-ray tube with a point-shaped spot, the focal spot diameter of the light source is 50-500 microns, and the power range of the light source is 10-3000 watts.

[0008] As an improvement to the above technical solution, the polycapillary X-ray parallel beam lens is an isosceles trapezoidal structure with one end larger than the other end. The small end of the polycapillary X-ray parallel beam lens faces the X-ray generator to receive the polychromatic X-rays emitted by the X-ray generator, and the large end of the polycapillary X-ray parallel beam lens faces the monochromator to convert the polycapillary X-ray parallel beam lens into a quasi-parallel polychromatic X-ray beam; with the line connecting the emission light source point and the final focus of the X-ray generator as the central axis, the central axis of the polycapillary X-ray parallel beam lens is obliquely intersected with the central axis.

[0009] As an improvement to the above technical solution, the quasi-parallel polychromatic X-ray beam refers to an X-ray beam with very small divergence and high intensity gain.

[0010] As an improvement to the above technical solution, the divergence of the polycapillary X-ray parallel beam lens is 2-15 mrad; its front focal length f q 15-100mm, inlet diameter D in 2-8mm, outlet diameter D out The thickness of the nanostructured carbon fiber is 4-15 mm, and the length L is 15-60 mm.

[0011] As an improvement to the above technical solution, the plane of the monochromator is obliquely intersected with the central axis of the polycapillary X-ray parallel beam lens and the polycapillary X-ray focuser, receives the quasi-parallel polychromatic X-ray beam emitted by the polycapillary X-ray parallel beam lens, and converts it into a monochromatic parallel X-ray beam and then emits it to the polycapillary X-ray focuser.

[0012] As an improvement to the above technical solution, the monochromator is a planar crystal.

[0013] As an improvement to the above technical solution, the polycapillary X-ray focuser is located on the output light path of the monochromator to receive the monochromatic parallel X-ray beam emitted by the monochromator, and converges the monochromatic parallel X-ray beam into a micro-focus spot of tens of microns. The micro-focus spots of several polycapillary X-ray focusers converge into a final focus; the polycapillary X-ray focuser is an isosceles trapezoidal structure with one end larger and the other end smaller. The large end of the polycapillary X-ray focuser faces the direction of the monochromator, and the small end faces the direction of the final focus. The central axis of the polycapillary X-ray focuser is obliquely intersected with the central axis.

[0014] As an improvement to the above technical solution, the focuser is a capillary X-ray semi-mirror or a single capillary X-ray focusing lens.

[0015] The working principle of the combined X-ray monochromatic convergence system of the present invention is:

[0016] Compared with the prior art, the present invention has the following advantages and positive effects:

[0017] The combined X-ray monochromatic focusing system of the present invention utilizes a large-angle X-ray light source to configure multiple focusing units. These focusing units ultimately form a converging microfocus. Compared to other X-ray monochromatic focusing devices, this system offers superior X-ray utilization and a brighter focal spot. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the structure of the present invention;

[0020] Figure 2 1 is a diagram of geometric parameters of a polycapillary X-ray parallel beam lens in an embodiment of the present invention;

[0021] Figure 3 Graph showing geometric parameters of a polycapillary X-ray focuser according to an embodiment of the present invention.

[0022] Among them: 1 is the X-ray generator; 2 is the polycapillary X-ray parallel beam lens; 3 is the monochromator; 4 is the polycapillary X-ray focuser; 5 is the final focus. DETAILED DESCRIPTION

[0023] 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 described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the scope of protection of the present invention.

[0024] like Figures 1 to 3 As shown, the combined X-ray monochromatic converging system of the present invention includes an X-ray generator 1 and several focusing units. Each X-ray focusing unit has a front focal point and a rear focal point. The main portion of the focusing unit is not located on the line connecting the front and rear focal points. Therefore, multiple X-ray focusing units can be designed so that the front and rear focal points of the multiple focusing units overlap, thus forming a combined X-ray monochromatic converging device. The laboratory X-ray generator 1 is placed at the front focal point of the combined monochromatic converging device, and the divergent polychromatic X-rays it emits are converged into a monochromatic X-ray microfocus 5.

[0025] One of the focusing units includes a polycapillary X-ray parallel beam lens 2, a monochromator 3, and a polycapillary X-ray focuser 4 connected in sequence; the focal spot of the X-ray generator 1 is located at the front focal spot of the polycapillary X-ray parallel beam lens 2, and the X-ray generator 1 is a point light source, radiating X-rays to the periphery with the point as the source; the polycapillary X-ray parallel beam lenses 2 of several focusing units are arranged on the optical path of the X-ray generator radiating outward 1, and the polycapillary X-ray focusers 4 of several focusing units have a converging final focus 5. Point source X-ray generator 1: used to generate X-rays, wherein the X-ray beam generated here is a divergent polychromatic X-ray. The polycapillary X-ray parallel beam lens 2: provided with an X-ray generator at its entrance focus, is used to receive divergent X-rays emitted by the X-ray source and convert the received divergent X-ray beam into a quasi-parallel X-ray beam with very small divergence and high intensity gain. The monochromator 3: located after the polycapillary X-ray parallel beam lens 2, at a certain angle to the exit direction of the polycapillary X-ray parallel beam lens 2, receives the polychromatic quasi-parallel X-ray beam emitted from the capillary X-ray half-lens 2, and converts it into a monochromatic quasi-parallel X-ray beam. The polycapillary X-ray focuser 4: placed in the exit light path of the monochromator 3, receives the monochromatic quasi-parallel X-ray beam emitted by the monochromator 3, and converges the quasi-parallel X-ray beam into a micro-focus spot of tens of microns. The micro-focus spots of multiple polycapillary X-ray focusers 4 converge into a final focus 5.

[0026] The target material of the X-ray tube is any one of copper, molybdenum, silver or tungsten. The X-ray generator is a point-shaped X-ray tube with a focal spot diameter of 50-500 microns and a light source power range of 10-3000 watts.

[0027] The polycapillary X-ray parallel beam lens is an isosceles trapezoidal structure with one end larger than the other end. The small end of the polycapillary X-ray parallel beam lens faces the X-ray generator to receive the polychromatic X-rays emitted by the X-ray generator, and the large end of the polycapillary X-ray parallel beam lens faces the monochromator to convert the polycapillary X-ray parallel beam lens into a quasi-parallel polychromatic X-ray beam; with the line connecting the emission light source point and the final focus of the X-ray generator as the central axis, the central axis of the polycapillary X-ray parallel beam lens is obliquely intersected with the central axis. The quasi-parallel polychromatic X-ray beam refers to an X-ray beam with very small divergence and high intensity gain. The divergence of the polycapillary X-ray parallel beam lens is 2-15mrad; its front focal length f q 15-100mm, inlet diameter D in 2-8mm, outlet diameter D out The thickness of the nanostructured carbon fiber is 4-15 mm, and the length L is 15-60 mm.

[0028] The monochromator's plane is obliquely intersected with the central axes of the polycapillary X-ray parallel beam lens and the polycapillary X-ray focuser. It receives the quasi-parallel polychromatic X-ray beam emitted by the polycapillary X-ray parallel beam lens, converts it into a monochromatic parallel X-ray beam, and then transmits it toward the polycapillary X-ray focuser. The monochromator is a planar crystal.

[0029] The polycapillary X-ray focuser is located in the monochromator's output optical path, receives the monochromatic parallel X-ray beam emitted by the monochromator, and converges the monochromatic parallel X-ray beam into a micro-focus spot of several tens of microns. Several micro-focus spots of the polycapillary X-ray focusers converge into a final focal point. The polycapillary X-ray focuser has an isosceles trapezoidal structure with one end larger than the other. The large end of the polycapillary X-ray focuser faces the monochromator, and the small end faces the final focal point. The central axis of the polycapillary X-ray focuser obliquely intersects the central axis. The focuser is a capillary X-ray half-mirror or a single capillary X-ray focusing lens.

[0030] In the combined X-ray monochromatic focusing system proposed by the present invention, the focusing unit can adopt multiple units according to its device, not limited to the attached Figure 1 Two symmetrical ones in the middle. If an X-ray light source with a large output angle is used, multiple focusing units can be installed. Compared with other X-ray monochromatic focusing devices, this combined X-ray monochromatic focusing system has the advantages of high X-ray utilization and higher focal spot brightness.

Claims

1. A combined monochromatic X-ray focusing system, characterized by: The apparatus comprises an X-ray generator and several focusing units, wherein one focusing unit comprises a polycapillary X-ray parallel beam lens, a monochromator, and a polycapillary X-ray focuser connected in sequence; the focal spot of the X-ray generator is located at the front focal spot of the polycapillary X-ray parallel beam lens; the X-ray generator is a point light source, radiating X-rays outward from the point as a source; the polycapillary X-ray parallel beam lenses of several focusing units are arranged on the optical path of the X-ray generator radiating outward, and the polycapillary X-ray focusers of several focusing units have a converging final focus; The target material of the X-ray tube is any one of copper, molybdenum, silver or tungsten; The X-ray generator is an X-ray tube with a point-shaped spot, a focal spot diameter of 50-500 microns, and a light source power range of 10-3000 watts; The polycapillary X-ray parallel beam lens is an isosceles trapezoidal structure with one end larger than the other. The small end of the polycapillary X-ray parallel beam lens faces the X-ray generator to receive the polychromatic X-rays emitted by the X-ray generator, and the large end of the polycapillary X-ray parallel beam lens faces the monochromator to convert the polycapillary X-ray parallel beam lens into a quasi-parallel polychromatic X-ray beam. The central axis of the polycapillary X-ray parallel beam lens is obliquely intersected with the central axis, with the line connecting the emission light source point and the final focus of the X-ray generator as the central axis. The polycapillary X-ray parallel beam lens has a divergence of 2-15 mrad; a front focal length fq of 15-100 mm, an inlet diameter Din of 2-8 mm, an outlet diameter Dout of 4-15 mm, and a length L of 15-60 mm; The plane of the monochromator is obliquely intersected with the central axis of the polycapillary X-ray parallel beam lens and the polycapillary X-ray focuser, receives the quasi-parallel polychromatic X-ray beam emitted by the polycapillary X-ray parallel beam lens, and converts it into a monochromatic parallel X-ray beam before emitting it toward the polycapillary X-ray focuser.

2. The combined X-ray monochromatic focusing system according to claim 1, wherein: The monochromator is a planar crystal.

3. The combined X-ray monochromatic focusing system according to claim 1, wherein: The polycapillary X-ray focuser is located on the output light path of the monochromator to receive the monochromatic parallel X-ray beam emitted by the monochromator, and converges the monochromatic parallel X-ray beam into a micro-focus spot of tens of microns. The micro-focus spots of several polycapillary X-ray focusers converge into a final focus; the polycapillary X-ray focuser is an isosceles trapezoidal structure with one end larger than the other end. The large end of the polycapillary X-ray focuser faces the direction of the monochromator, and the small end faces the direction of the final focus. The central axis of the polycapillary X-ray focuser is obliquely intersected with the central axis.

4. The combined X-ray monochromatic focusing system according to claim 1, wherein: The focuser is a capillary X-ray semi-mirror or a single capillary X-ray focusing lens.

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