CN102325421A - Adjustable X-ray pseudo-thermal light source based on microporous film - Google Patents
Adjustable X-ray pseudo-thermal light source based on microporous film Download PDFInfo
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- 239000013078 crystal Substances 0.000 claims abstract description 16
- 239000012982 microporous membrane Substances 0.000 claims description 59
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- 230000001105 regulatory effect Effects 0.000 claims description 6
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 3
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- 239000011148 porous material Substances 0.000 claims description 2
- 230000003471 anti-radiation Effects 0.000 abstract 1
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- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000005338 frosted glass Substances 0.000 description 3
- 230000001427 coherent effect Effects 0.000 description 2
- 230000000644 propagated effect Effects 0.000 description 2
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- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
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Abstract
A high-brightness adjustable X-ray pseudo-thermal light source based on a microporous film comprises a monochromatic X-ray generating system and a pseudo-thermal X-ray adjusting and controlling cavity which are arranged in an anti-radiation shell, wherein the monochromatic X-ray generating system is coaxially formed by an oscillator, a white light slit and a bicrystal monochromator, and the pseudo-thermal X-ray adjusting and controlling cavity is coaxially formed by an adjustable slit group, the microporous film and a motion controller thereof and an X-ray exit window. The hot X-ray generated by the oscillator is transmitted to the white light slit firstly, enters the double-crystal monochromator after beam limiting, becomes monochromatic X-ray after being monochromated by the double-crystal monochromator, irradiates the pseudothermal X-ray regulation cavity, sequentially passes through the adjustable slit group and the micropore film which are fixed on the chassis in the cavity, forms dynamic X-ray speckle behind the micropore film under the control of the micropore film motion controller, and is emitted from the X-ray exit window, namely the X-ray pseudothermal light field. The invention has the characteristics of suitability for X-ray wave bands, high resolution, high brightness, adjustability and good stability.
Description
Technical field
The present invention relates to x-ray source, the counterfeit thermal light source of the adjustable X ray of particularly a kind of high brightness based on microporous membrane, it can be used as x-ray source and is applied to X ray intensity correlation imaging field.
Background technology
In the intensity correlation imaging applications, an important problem is to need to obtain detectable hot light field.Coherence time to hot light is short; Existing photo-detector can't be measured the instantaneous strength of hot light fluctuation; People such as Martienssen have invented the counterfeit thermal light source of a kind of continous way and [have seen W.Martienssen and E.Spiller in 1964; " Coherence and Fluctuations in Light Beams ", American Journal of Physics 32,8 (1964)].2006; In order to overcome the problems such as cross-spectral purity condition that the counterfeit thermal light source of continous way does not satisfy true hot light field, people such as the Han Shensheng of Shanghai Optics and Precision Mechanics institute, Chinese Academy of Sciences have invented a kind of high-light pulse type pseudo-thermal light source (patent of invention ZL200710036968.X).The thermal fluctuation of the counterfeit hot light field of this high-light pulse type pseudo-thermal light source; Has very long coherence time; Can be recorded truly by the Photodetection system of limited passband; And do not receive the influence of the passband of the Photodetection system that uses, satisfy the cross-spectral purity condition of true hot light field, can be used for intensity correlation imaging research field.But above-mentioned counterfeit thermal light source is to adopt laser illumination frosted glass to obtain counterfeit hot speckle, can only be applicable to visible light wave range, for X ray, and its wave-length coverage, beam properties and essential distinction is all arranged with object interaction process and visible light:
1, X ray does not have the practical coherent source of similar visible light wave range laser, and X ray coherence time (picosecond magnitude) is far smaller than the response time (nanosecond order) of existing detector;
2, the X ray wavelength is short, has very high penetrability, does not have suitable spatial alternation modulation element, can not adopt the frosted glass scattering effect to obtain counterfeit hot speckle.
Summary of the invention
The technical problem that the present invention will solve is to overcome the above-mentioned defective of technology formerly; Provide the adjustable X ray of a kind of high brightness counterfeit thermal light source based on microporous membrane; The coherence time of the counterfeit thermal light source of this X ray and resolution (speckle yardstick) are adjustable; Have that X-band is suitable for, the characteristics of high-resolution, high brightness, adjustable and good stability, can be applied to X ray intensity correlation imaging field.
Technical solution of the present invention is following:
The counterfeit thermal light source of the adjustable X ray of a kind of high brightness based on microporous membrane comprises that the homogeneous X-ray that places radiation protective casing produces system and counterfeit thermal X-rays regulation and control chamber two parts, is characterized in that:
< 1>described homogeneous X-ray produces system and is made up of coaxial oscillator, white light slit, double-crystal monochromator, and described counterfeit thermal X-rays regulation and control chamber is made up of coaxial adjustable slit group, microporous membrane and motion controller thereof, X ray exit window;
< 2>microporous membrane in described counterfeit thermal X-rays regulation and control chamber is fixed on the microporous membrane motion controller, the micropore that has a large amount of random distribution on the microporous membrane in described counterfeit thermal X-rays regulation and control chamber, and its pore diameter range is 0.1 to 1 micron; Adjustable slit group and microporous membrane motion controller are fixed on the same chassis;
< 3>the adjustable slit group in described counterfeit thermal X-rays regulation and control chamber comprises horizontal direction slit and vertical direction slit, and its slit width adjustable range is 0 to 20mm, and slot set increases to the increase with slit width of the distance of microporous membrane.
Described homogeneous X-ray produces the thermal X-rays of the oscillator generation of system and propagates through free space, is limit the bundle back to get into double-crystal monochromator at white light slit place, after the double-crystal monochromator monochromatization, becomes homogeneous X-ray.
The homogeneous X-ray that described homogeneous X-ray generation system produces; Through penetrating microporous membrane after the adjustable slit group in the counterfeit thermal X-rays regulation and control chamber; Diffraction forms X ray speckle, the speckle yardstick δ x of its level and vertical direction and the slit width d of δ y and adjustable slit group at the microporous membrane rear
xAnd d
ySatisfy relational expression:
In the formula, l is the distance of oscillator to microporous membrane, and z is the distance that microporous membrane arrives detection place.
Microporous membrane motion controller in the described counterfeit thermal X-rays regulation and control chamber; Can control microporous membrane in direction translation or rotation perpendicular to light path; Thereby obtain dynamic X ray speckle; By being the counterfeit hot light field of X ray after the outgoing of X ray exit window, its coherence time is by the movement space decision of microporous membrane.
The present invention compares with technological counterfeit thermal light source formerly, mainly contains the advantage of following several respects:
1, is applicable to the X-ray wave band.The present invention has overcome the limitation that X ray does not have the practical coherent source of similar visible light wave range laser; Make x-ray source satisfy the response time of existing detector coherence time; Realized the true record of the hot light field fluctuation of X ray, be applicable to produce various conventional X-ray wavelength (＜100KeV) counterfeit thermal X-rays source, this is the most important advantage of the present invention; Can be used for the imaging of X ray intensity correlation, and formerly technology is only applicable to the visual intensity relevance imaging.
2, high-resolution.The wavelength of X ray is far smaller than wavelength of visible light, so the limiting resolution of x-ray imaging is higher than visual light imaging far away.Utilization of the present invention is passed the X-ray diffraction effect of microporous membrane and is obtained the dynamic speckle field; And the laser radiation frosted glass scattering effect that formerly adopts in the technology is obtained speckle; Therefore; The present invention can obtain the speckle yardstick much smaller than the visible light speckle in theory, utilizes x-ray source to carry out the high-resolution intensity correlation to become possibility thereby make.
3, high brightness.The present invention utilizes oscillator to produce X ray, and its center cone spectrum brightness can reach 10
18Ph/s/0.1%BW, thus the high brightness of the counterfeit hot speckle field of X ray can be guaranteed.
4, adjustable.The present invention has realized the speckle yardstick regulation and control in counterfeit thermal X-rays source through the slot set width of regulating the counterfeit thermal X-rays generation of critical component chamber; Through regulating speckle regulation and control coherence time that the microporous membrane movement space has realized counterfeit thermal X-rays source.
5, good stability.Adjustable slit group, microporous membrane and the motion controller thereof that the counterfeit thermal X-rays of critical component of the present invention produces the chamber can be implemented in integrated on the base plate; Each interelement can not produce relative displacement; Can guarantee the stable output and the less trouble of x-ray source, these are very important to long time for exposure and high-resolution imaging.
Description of drawings
Fig. 1 is the example structure sketch map that the present invention is based on the counterfeit thermal light source of adjustable X ray of microporous membrane, among the figure:
1: oscillator, 2: white light slit, 3: double-crystal monochromator, 4: counterfeit thermal X-rays regulation and control chamber, 401: chassis, 402: adjustable slit group, 403: microporous membrane, 404: microporous membrane motion controller, 405:X ray exit window, 5: radiation protective casing.
Fig. 2 is the spatial intensity distribution figure of speckle field in coherence time that the embodiment of the invention produces.
Embodiment
The present invention is the counterfeit thermal light source of the adjustable X ray of a kind of high brightness based on microporous membrane, comprising: oscillator 1, white light slit 2, double-crystal monochromator 3, counterfeit thermal X-rays regulation and control chamber 4 and radiation protective casing 5.Wherein, counterfeit thermal X-rays is regulated and control chamber 4 by chassis 401, adjustable slit group 402, and microporous membrane 403, microporous membrane motion controller 404, X ray exit window 405 constitutes.Thermal X-rays by oscillator 1 produces is propagated through free space; At first arrive white light slit 2, thermal X-rays is got into double-crystal monochromator 3 at white light slit 2 by limit bundle back, after double-crystal monochromator 3 monochromatizations, becomes homogeneous X-ray; Irradiation is to counterfeit thermal X-rays regulation and control chamber 4; In the chamber,, under the control of microporous membrane motion controller 404, form the dynamic X-ray speckle at microporous membrane 403 rears successively through being fixed in the adjustable slit group 402 and microporous membrane 403 on the chassis 401; By 405 outgoing of X ray exit window, be the counterfeit hot light field of X ray.
The present embodiment characteristics are following:
1, oscillator 1, white light slit 2, double-crystal monochromator 3 are coaxial, and adjustable slit group 402, microporous membrane 403, the X ray exit window 405 in counterfeit thermal X-rays regulation and control chamber 4 are coaxial;
2, the thermal X-rays that is produced by oscillator 1 is propagated through free space, is got into double-crystal monochromator 3 at white light slit 2 by limit bundle back, after the double-crystal monochromator monochromatization, becomes homogeneous X-ray;
3, homogeneous X-ray successively through being fixed in adjustable slit group 402 and the microporous membrane 403 on the chassis 401, forms the X ray speckle at microporous membrane 403 rear diffraction in counterfeit thermal X-rays regulation and control chamber 4;
4, the horizontal direction and the vertical direction slit width of the adjustable slit group 402 in counterfeit thermal X-rays regulation and control chamber 4 are 1000 microns; The micropore size of microporous membrane 403 is 0.5 micron; Oscillator 1 is 50m to the distance of microporous membrane 403; Speckle yardstick δ x that then the 50cm distance detects at the microporous membrane rear and δ y be micron for
, and promptly the resolution at 50cm place is 10 microns;
5, counterfeit thermal X-rays is regulated and control the microporous membrane motion controller 404 in chamber 4; Can control microporous membrane 403 in direction translation perpendicular to light path; Its translation time interval is 1ms, is the dynamic X-ray speckle of 1ms thereby obtain coherence time, by 405 outgoing of X ray exit window; Be the counterfeit hot light field of X ray, this light field can adopt the detector of conventional nanosecond order to accomplish the true detection record of hot light field fluctuation;
6, the microporous membrane 403 in counterfeit thermal X-rays regulation and control chamber 4 is fixed on the microporous membrane motion controller 404, adjustable slit group 402 and microporous membrane motion controller 404 be fixed on the chassis 401, thereby the mainboard of realizing counterfeit thermal X-rays regulator control system is integrated.
The aforesaid structure of x-ray source of the present invention can be divided into three parts on function.First comprises oscillator 1, white light slit 2 and double-crystal monochromator 3, and this part is used to obtain required high brightness homogeneous X-ray.Second portion is counterfeit thermal X-rays regulation and control chambeies 4, comprises chassis 401, adjustable slit group 402, microporous membrane 403, microporous membrane motion controller 404, X ray exit window 405.In this part, be that the high brightness homogeneous X-ray is regulated and control, thereby obtain the counterfeit thermal light source of adjustable X ray based on the high brightness of microporous membrane.Third part is a radiation protective casing 5, is used to prevent that X ray from producing radiation leakage, causes unexpected injury.
In sum, the present invention is based on the counterfeit thermal light source of the adjustable X ray of high brightness of microporous membrane, have that the X-ray wave band is suitable for, characteristics of high-resolution, high brightness, adjustable and good stability.
Claims (4)
1. the counterfeit thermal light source of adjustable X ray based on microporous membrane comprises that the homogeneous X-ray that places radiation protective casing produces system and counterfeit thermal X-rays is regulated and control chamber two parts, it is characterized in that:
Described homogeneous X-ray produces system and is made up of coaxial oscillator, white light slit, double-crystal monochromator, and described counterfeit thermal X-rays regulation and control chamber is made up of coaxial adjustable slit group, microporous membrane and motion controller thereof, X ray exit window;
The microporous membrane in described counterfeit thermal X-rays regulation and control chamber is fixed on the microporous membrane motion controller, the micropore that has a large amount of random distribution on the microporous membrane in described counterfeit thermal X-rays regulation and control chamber, and its pore diameter range is 0.1 to 1 micron; Adjustable slit group and microporous membrane motion controller are fixed on the same chassis;
The adjustable slit group in described counterfeit thermal X-rays regulation and control chamber comprises horizontal direction slit and vertical direction slit, and the slit width adjustable range is 0 to 20mm, and slot set increases to the increase with slit width of the distance of microporous membrane.
2. the counterfeit thermal light source of the adjustable X ray of the high brightness based on microporous membrane according to claim 1; It is characterized in that described homogeneous X-ray produces the thermal X-rays that the oscillator of system produces and propagates through free space; Limit the bundle back to get into double-crystal monochromator at white light slit place, after the double-crystal monochromator monochromatization, become homogeneous X-ray.
3. the counterfeit thermal light source of the adjustable X ray of the high brightness based on microporous membrane according to claim 1; It is characterized in that the homogeneous X-ray that described homogeneous X-ray generation system produces; Through penetrating microporous membrane after the adjustable slit group in the counterfeit thermal X-rays regulation and control chamber; Diffraction forms X ray speckle, the speckle yardstick δ x of its level and vertical direction and the slit width d of δ y and adjustable slit group at the microporous membrane rear
xAnd d
ySatisfy relational expression:
In the formula, l is the distance of oscillator to microporous membrane, and z is the distance that microporous membrane arrives detection place.
4. the counterfeit thermal light source of the adjustable X ray of the high brightness based on microporous membrane according to claim 1 is characterized in that described microporous membrane motion controller, has translation or rotating mechanism.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110129449 CN102325421B (en) | 2011-05-18 | 2011-05-18 | Adjustable X-ray pseudo-thermal light source based on microporous film |
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| CN 201110129449 CN102325421B (en) | 2011-05-18 | 2011-05-18 | Adjustable X-ray pseudo-thermal light source based on microporous film |
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| CN102325421A true CN102325421A (en) | 2012-01-18 |
| CN102325421B CN102325421B (en) | 2013-08-14 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039063A (en) * | 2014-06-25 | 2014-09-10 | 中国科学院上海光学精密机械研究所 | Coding metal aperture array plate based high-contrast X-ray pseudo-thermal source |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351281A (en) * | 1993-04-15 | 1994-09-27 | Angelo M. Torrisi | Handling support for X-ray spectroscopic analysis |
| JPH10289797A (en) * | 1997-04-11 | 1998-10-27 | Sangyo Souzou Kenkyusho:Kk | X-ray generation device |
| CN101013048A (en) * | 2007-01-30 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | High-brightness pulse type pseudo-thermal light source |
| CN201368856Y (en) * | 2008-10-20 | 2009-12-23 | 北京师范大学 | Microbeam X-ray diffractometer based on capillary X-ray optical device |
-
2011
- 2011-05-18 CN CN 201110129449 patent/CN102325421B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5351281A (en) * | 1993-04-15 | 1994-09-27 | Angelo M. Torrisi | Handling support for X-ray spectroscopic analysis |
| JPH10289797A (en) * | 1997-04-11 | 1998-10-27 | Sangyo Souzou Kenkyusho:Kk | X-ray generation device |
| CN101013048A (en) * | 2007-01-30 | 2007-08-08 | 中国科学院上海光学精密机械研究所 | High-brightness pulse type pseudo-thermal light source |
| CN201368856Y (en) * | 2008-10-20 | 2009-12-23 | 北京师范大学 | Microbeam X-ray diffractometer based on capillary X-ray optical device |
Non-Patent Citations (2)
| Title |
|---|
| 张明辉等: "基于统计光学的无透镜鬼成像数值模拟与实验验证", 《光学学报》 * |
| 沈夏等: "脉冲式赝热光源的实验研究", 《中国激光》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104039063A (en) * | 2014-06-25 | 2014-09-10 | 中国科学院上海光学精密机械研究所 | Coding metal aperture array plate based high-contrast X-ray pseudo-thermal source |
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