CN203870391U - Multi-point spectrum resolution soft X-ray framing imaging system - Google Patents
Multi-point spectrum resolution soft X-ray framing imaging system Download PDFInfo
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Abstract
The utility model provides a multi-point spectrum resolution soft X-ray framing imaging system. The imaging system mainly comprises a pin hole array plate, a grazing incidence flat mirror, an optical adjusting mechanism, a filter disc, a light limiting slit, a recording medium and the like. The grazing incidence flat mirror and the filter disc form an X-ray selection element, each grazing incidence flat mirror and a column of pin holes form an imaging channel, the diameters of each column of pin holes are optimally designed according to observation points so as to obtain optimum space resolution, and an imaging result is finally recorded by use of a time resolution framing camera or a time integral X-ray imaging plate and the like. The imaging system is mainly used for observing laser fusion, Z-hoop polycondensation or high-temperature high-density plasma in a laboratory astrophysics experiment, and a plasma evolution image with time resolution, two-dimensional space resolution and spectrum resolution can be obtained simply through one experiment. Compared to the prior art, the system provided by the utility model has the advantages of quite low implementation difficulty, wide application scope, flexible region configuration, good imaging signal-to-noise ratio, multi-point imaging characteristic and the like.
Description
Technical field
The utility model relates to a kind of grenz ray framing imaging system, especially relates to a kind of multipotency point spectrum based on grazing planar mirror and differentiates grenz ray framing imaging system and application thereof, belongs to x-ray imaging field.
Background technology
For the inertial confinement fusion of indirect driving, Hohlraum radiation field uniformity is directly connected to pellet implosion symmetry.From the angle of experimental study, black chamber plasma develops and relates to two significant process: laser facula motion and chamber wall Cathode plasma explosion, and their existing obvious differences, interrelated again, and all occur near laser energy deposition district.Laser facula motion directly affects pellet irradiation uniformity.Chamber wall plasma expands at a high speed, may make pellet shift to an earlier date preheating and even disintegrate, and causes density gradient in chamber simultaneously, causes the displacement of critical density face and laser refraction, and then affects laser injection efficiency and pellet irradiation uniformity.The black chamber of using in view of inertial confinement fusion is made by gold copper-base alloy conventionally, for qualitative assessment and sign Hohlraum radiation field uniformity, monochromatic or the accurate monochromatic plasma temporal-spatial evolution image that must obtain in theory golden O band, N band and M band, this will ask diagnostic device must possess time resolution simultaneously, two-dimensional space is differentiated and spectrally resolved ability.
X-ray framing camera meets time-space resolution requirement, the important diagnostic equipment of laser inertial confinement fusion research, it is comprised of pinhole array, negative electrode microstrip line, microchannel plate, video screen and picosecond impulse generator etc., and negative electrode microstrip line is directly coated on microchannel plate input face.During camera work, the X-radiation that laser plasma produces is imaged onto on negative electrode microstrip line through pinhole array, picosecond electric pulse transmits on micro-being with simultaneously, electric pulse is every through an imaging region, camera exposure once, finally forms the serial two-dimension images of arranging in chronological order on record surface.The about 80ps of time resolution in fact, two-dimensional space is differentiated and is better than 15lp/mm, and response spectrum scope is 0.1-10keV.So wide spectral response explanation framing camera does not possess spectrum selective power, and framing camera cannot be directly used in quantitative observation Hohlraum radiation field uniformity.
For adapting to the needs of experimental study, use at present filter disc (the logical filter disc of band or ROSS filter disc) to obtain accurate Single energy X ray absorptionmetry, then be imaged onto framing camera test surface through pinhole array, to obtain, there is the plasma Evolution maps that space time energy is differentiated.According to experiment effect, current techniques at least exists three aspects: not enough: the first, and filter disc method transmitance is low, framing camera is operated under dynamic mode, a little less than the image intensity signal obtaining, poor signal to noise, noise signal is easily covered the key character in the plasma evolutionary process of black chamber; The second, filter disc monochromaticity is poor, has sigmatron tail, makes imaging results always comprise the radiation feature information of high-temperature plasma; The 3rd, very large compared with the filter disc manufacture difficulty of Soft X-Ray Region (<1keV), filter disc thickness is generally sub-micrometer scale, in experiment, easily by target disintegration debris damage, greatly affects conventional efficient.
Summary of the invention
The purpose of this utility model is exactly to provide a kind of multipotency point spectrum based on grazing planar mirror to differentiate grenz ray framing imaging system and application thereof in order to overcome the defect of above-mentioned existing diagnostic techniques existence.
The purpose of this utility model can be achieved through the following technical solutions:
Multipotency point spectrum is differentiated a grenz ray framing imaging system, and this imaging system comprises pinhole array plate, grazing planar mirror, optical adjusting mechanism, filter disc, limit optical slits and recording medium; The multiple row imaging pin hole of having arranged on described pinhole array plate, every row pin hole and a grazing planar mirror form an imaging band; Described grazing planar mirror is arranged on optical adjusting mechanism; The X-ray that target sends is after pin-hole imaging, and irradiation, on grazing planar mirror, meets the light of specific glancing angle condition by mirror-reflection out, by limit optical slits, is finally imaged onto on recording medium, and imaging picture number is identical with pin hole number.
Described pinhole array plate comprises substrate and is arranged in the pinhole array on substrate by certain rule, described substrate is tantalum thin slice or tungsten thin slice or golden thin slice, its thickness is not more than 50 microns, described pinhole array is that the method by laser boring or photoetching forms a plurality of through holes that run through of arranging by array rule on aforesaid substrate, described through-hole diameter can carry out optimal design by point according to x-ray observation, to obtain optimal spatial, differentiates.
Described grazing planar mirror surface has been coated with spectral selectivity film, and described film can be that monofilm can be also multilayer film.
Described monofilm grazing planar mirror spectrum selects principle based on glancing incidence X ray total reflection principle, has sigmatron cutoff function.
Described multilayer film grazing planar mirror spectrum selects principle based on glancing incidence X ray Bragg diffraction principle.
Described grazing planar mirror quantity is 1 or 2 or 4.
Described optical adjusting mechanism is the base for supporting of grazing planar mirror, makes grazing planar mirror have position and attitude adjustment function, and described position and attitude adjustment comprise two-dimension translational, pitching and orientation adjustment.
Its thickness of described filter disc, between 0.05 micron to 10 microns, adopts homogenous material thin slice when thickness is thicker, be made on CH film or C film substrate during thinner thickness.
Described limit optical slits is positioned at X ray light beam infall, adopts heavy metal material to make, and thickness is not less than 3 millimeters, and slit width is between 1 millimeter to 5 millimeters.
When described recording medium is X-ray imaging plate, film or CCD, obtain the two-dimensional imaging result of time integral; When described recording medium is framing camera, obtain time-resolved plasma two dimension Evolution maps.
Multipotency point spectrum is differentiated the application of grenz ray framing imaging system, the plasma diagnostics of this system applies in laser fusion, the fusion of Z constriction and Laboratory astrophysics experiment, and object is the Evolution of research plasma time, space and power spectrum.
Compared with prior art, the utlity model has following advantage:
1. the multipotency point spectrum the utility model proposes is differentiated grenz ray framing imaging system and application thereof, gate pin hole framing imaging technique based on ripe, only by increasing grazing planar mirror at imaging optical path, can make system possess time resolution, two-dimensional space resolution and spectrally resolved ability, rationally reduce enforcement difficulty, improved system availability.The utility model is the very big lifting to framing camera diagnosis capability.
2. grazing planar mirror quantity of the present utility model can reach at most 4, corresponding 4 X ray choosing energy passage, so system has multipotency point imaging characteristics.
3. grazing planar mirror surface film of the present utility model can flexible configuration, can adapt to the specific demand that different Physical Experiments can be put observation, and range of application is wider.
4. when grazing planar mirror surface film of the present utility model is monofilm, can eliminate the impact of sigmatron tail completely, significantly improve imaging signal to noise ratio (S/N ratio), can be applicable to the observation experiment of plasma physical efficiency band radiation; When grazing planar mirror surface film is multilayer film, spectral resolving power at least improves several times, can be applicable to the monoenergetic observation experiment of plasma backlight photography or spontaneous radiation.
5. pinhole array through-hole diameter of the present utility model can carry out optimal design by point according to observation, can make system obtain optimal spatial and differentiate, and is conducive to overcome the problem that picture is fuzzy, improves image quality.
Accompanying drawing explanation
Fig. 1 is the light channel structure schematic diagram that in embodiment 1, triple channel spectrum is differentiated grenz ray framing imaging system;
Fig. 2 is the schematic diagram of arranging of the pinhole array in embodiment 1;
Fig. 3 is the schematic diagram of arranging of the framing camera record surface imaging region in embodiment 1;
Fig. 4 is that the X ray choosing of passage 1 and passage 2 in embodiment 1 can curve;
Fig. 5 is the Be filter disc X ray transmittance curve of passage 3 in embodiment 1;
Fig. 6 is the imaging results of utilizing imaging plate to obtain as recording medium in embodiment 1;
Fig. 7 is grazing planar mirror that in embodiment 2, four-way spectrum the is differentiated grenz ray framing imaging system schematic diagram of arranging;
In figure: 1. target object 2. pinhole array plate 3. passage 1 grazing planar mirror 4. passage 1 optical adjusting mechanism 5. passage 2 grazing planar mirror 6. passage 2 optical adjusting mechanism 7. is limit micro-14. pinhole array base board 15. passage 1 choosing energy curve 16. passage 2 choosing energy curve 17.Be filter disc transmittance curve 18. four-way system first grazing planar mirror substrate 19. four-way system second grazing planar mirror substrate 20. four-way system channel 1 light 21. four-way system channel 2 light 22. four-way system channel 4 light 23. four-way system channel 3 light of being with of optical slits 8. filter disc assembly 9. recording medium 10. passage 1 light 11. passage 2 light 12. passage 3 light 13. framing camera.
Embodiment
Below in conjunction with accompanying drawing and concrete embodiment, the utility model is elaborated.
Embodiment 1
The present embodiment is that triple channel spectrum is differentiated grenz ray framing imaging system, has designed three imaging bands, and object is that target plasma is realized to three energy point observation.This imaging system is mainly used in observing the evolutionary process of high-temperature high-density plasma time, space and power spectrum in inertial confinement fusion or the fusion of Z constriction.As shown in Figure 1, this imaging system is comprised of imageable target object 1, pinhole array plate 2, passage 1 grazing planar mirror 3, passage 1 optical adjusting mechanism 4, passage 2 grazing planar mirror 5, passage 2 optical adjusting mechanisms 6, limit optical slits 7, filter disc 8 and recording medium 9 etc.
For passage 1, its imaging process is: the wide range X-ray 10 that target object 1 sends is after pin-hole imaging, irradiation is on monofilm grazing planar mirror 3, the light that meets glancing incidence condition is by mirror-reflection out (light that does not meet glancing incidence condition is absorbed by minute surface), so far complete " low-pass filtering " of X ray, reflection ray continues to propagate, and completes again " high-pass filtering " of X ray by filter disc 8, and filtered accurate monoenergetic light is finally imaged onto on recording medium 9.For passage 2, its imaging process and passage 1 are similar: the wide range X-ray 11 that target object 1 sends is after pin-hole imaging, irradiation is on monofilm grazing planar mirror 5, the light that meets glancing incidence condition is by mirror-reflection out (light that does not meet glancing incidence condition is absorbed by minute surface), to " high-pass filtering ", filtered accurate monoenergetic light is finally imaged onto on recording medium 9.
For passage 3, be in imaging optical path without grazing planar mirror with the difference of passage 1 and passage 2, only by filter disc 8, complete " high-pass filtering " of X-ray 12, therefore passage 3 is compared with hard x-ray imaging passage, the imaging results of acquisition also always comprises sigmatron radiation information.Every passage becomes 4 width images, on record surface, can obtain 12 picture frames altogether.If adopt framing camera as recording medium 9, in micro-distribution on 13 as shown in Figure 2, framing camera is four microstrip structures to imaging region, micro-be with 13 with the orthogonal thereto relation of arranging of passage, every is micro-with the different pictures that can put of upper one-tenth 3 width.
Pinhole array is the image-forming component of system, is the topmost determinative of imaging system spatial resolution.For the pin-hole imaging system in laser inertial confinement fusion Physical Experiment, for obtaining good spatial discrimination effect, its pinhole diameter is less than 30um conventionally, easily there is diffraction in grenz ray now, in image planes, form diffraction spot, pin hole is less, and diffraction pattern is just larger.Therefore must consider the impact that how much resolutions and diffraction are differentiated, the comprehensive spatial discrimination of system is expressed as:
（1）
In formula, R
gfor system is differentiated for how much, R
dfor system diffraction, differentiate, λ is X ray wavelength, and d is pinhole diameter, and u and M are respectively imaging system object distance and enlargement factor.To formula 1 differentiate, order
, can obtain spatial discrimination R corresponding optimal needle bore dia d when minimal value
mindifferentiate R with optimal spatial
min,
（2）
（3）
This example has three energy channels, for obtaining optimal spatial, differentiates, and according to 2, three passages of formula, must design three kinds of corresponding optimum apertures.In this example, get enlargement factor M=5, object distance u=88.3mm, passage 1 sight peak can be put as 550eV; Passage 2 sight peak can be put as 750eV; Passage 3 observation X ray energy are greater than 2keV.By above-mentioned data substitution formula 2 and formula 3, optimal needle bore dia and the optimal spatial that can obtain system are differentiated, and result is as shown in table 1.As shown in Figure 3, the method by laser boring or photoetching forms a plurality of through holes that run through of arranging by 3 * 4 array rules to the pinhole array of final design on pinhole array substrate 14.
Table 1
The grazing planar mirror 3 of described passage 1 is Al level crossing, and method for making is to be coated with Al film (thickness is 100-500nm) at the K9 of smooth finish superior performance glass surface.Under 3 ° of grazing angles, as shown in Figure 4, the filter disc of employing is the Al paillon foil that 200nm is thick to the combination of Al level crossing and filter disc choosing energy curve 15.As seen from the figure, the sight peak of passage 1 can be put as 550eV, and spectrum is differentiated E/ Δ E=2.3.
The grazing planar mirror 5 of described passage 2 is Cu level crossing, and method for making is to be coated with Cu film (thickness is 100-500nm) at the K9 of smooth finish superior performance glass surface.Under 3 ° of grazing angles, as shown in Figure 4, the filter disc of employing is the Al paillon foil that 800nm is thick to the combination of Cu level crossing and filter disc choosing energy curve 16.As seen from the figure, the sight peak of passage 2 can be put as 750eV, and spectrum is differentiated E/ Δ E=3.
In the imaging optical path of described passage 3 without grazing planar mirror, adopt the Be filter disc that 100 μ m are thick to end low energy X ray, its transmittance curve 17 as shown in Figure 5, as seen from the figure, the observation X ray ENERGY E >2keV of passage 3, can be used for diagnosing the district's radiation of Au plasma crown.
The utility model has designed the optical adjusting mechanism of grazing planar mirror, described adjusting mechanism has four and adjusts degree of freedom, the two-dimension translational adjustment, pitching adjustment and the orientation adjustment that are respectively and normal direction tangential along minute surface, can realize the high precision adjustment of grazing planar mirror position and attitude.Described adjustment its objective is and makes X ray require irradiation to minute surface according to 3 ° of glancing angles, glancing angle error is less than 0.01 °, to select the X ray spectrum of demand, and obtain maximum intensity of reflected light, imaging results is arranged on imaging surface according to shown in Fig. 3 simultaneously.
The limit optical slits 7 of this example is positioned at X ray light beam infall, adopts heavy metal material to make, and thickness is not less than 3 millimeters, and slit width is between 1 millimeter to 5 millimeters.
Recording medium 9 of the present utility model can be X-ray imaging plate, film or CCD, can be also framing camera.The experimental result of Fig. 6 for adopting X-ray imaging plate to obtain, x-ray source utilizes the mode of laser target shooting to produce, and experiment condition is as follows: laser energy is 3J, pulse width 1.1ns, optical wavelength 1064nm, target is Cu flat target, between laser and imaging system, angle is 45 °.The plasma picture frame obtaining is time integral, and passage 1 sight peak can be put as 550eV; Passage 2 sight peak can be put as 750eV; Passage 3 observation X ray energy are greater than 2keV.Adopting framing camera is to obtain time-resolved plasma Evolution maps as the object of recording medium 9.
Embodiment 2
Be with the difference of embodiment 1, this system is four-way system, and pinhole array is 4 * 4 arrays, is all provided with grazing planar mirror in the imaging optical path of all passages, and as shown in Figure 7, every passage becomes 4 width images, on record surface, can obtain 16 picture frames altogether.This example feature is, four-way system is only used two grazing planar mirror substrates (comprising the first level crossing substrate 18 and the second level crossing substrate 19) to realize four-way imaging function, the X-ray 20 of passage 1 is irradiated to the first level crossing substrate 18 fronts, the X-ray 21 of passage 2 is irradiated to the first level crossing substrate 18 reverse side, the X-ray 23 of passage 3 is irradiated to the second level crossing substrate 19 fronts, and the X-ray 22 of passage 4 is irradiated to the second level crossing substrate 19 reverse side.The surface of every grazing planar mirror substrate front surface and reverse side has all been coated with spectral selectivity film, and described film can be that monofilm can be also multilayer film.
Claims (8)
1. multipotency point spectrum is differentiated a grenz ray framing imaging system, it is characterized in that, this imaging system comprises pinhole array plate, grazing planar mirror, optical adjusting mechanism, filter disc, limit optical slits and recording medium; The multiple row imaging pin hole of having arranged on described pinhole array plate, every row pin hole and a grazing planar mirror form an imaging band; Described grazing planar mirror is arranged on optical adjusting mechanism; The X-ray that target sends is after pin-hole imaging, and irradiation, on grazing planar mirror, meets the light of specific glancing angle condition by mirror-reflection out, by limit optical slits, is finally imaged onto on recording medium, and imaging picture number is identical with pin hole number.
2. a kind of multipotency point spectrum according to claim 1 is differentiated grenz ray framing imaging system, it is characterized in that, described pinhole array plate comprises substrate and be arranged in the pinhole array on substrate by certain rule, and described substrate thickness is less than 50 microns.
3. a kind of multipotency point spectrum according to claim 2 is differentiated grenz ray framing imaging system, it is characterized in that, described pinhole array is that the method by laser boring or photoetching forms a plurality of through holes that run through of arranging by array rule on aforesaid substrate.
4. a kind of multipotency point spectrum according to claim 1 is differentiated grenz ray framing imaging system, it is characterized in that, described grazing planar mirror plated surface is shaped with spectral selectivity film, and described film is monofilm or multilayer film.
5. a kind of multipotency point spectrum according to claim 4 is differentiated grenz ray framing imaging system, it is characterized in that, described grazing planar mirror quantity is 1,2 or 4.
6. a kind of multipotency point spectrum according to claim 1 is differentiated grenz ray framing imaging system, it is characterized in that, described optical adjusting mechanism is the base for supporting of grazing planar mirror, make grazing planar mirror have position and attitude adjustment function, described position and attitude adjustment comprise two-dimension translational, pitching and orientation adjustment.
7. a kind of multipotency point spectrum according to claim 1 is differentiated grenz ray framing imaging system, it is characterized in that, its thickness of described filter disc is 0.05 micron to 10 microns.
8. a kind of multipotency point spectrum according to claim 1 is differentiated grenz ray framing imaging system, it is characterized in that, described recording medium is X-ray imaging plate, framing camera, film or CCD.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103955108A (en) * | 2014-05-15 | 2014-07-30 | 中国工程物理研究院激光聚变研究中心 | Multiple-energy-point spectrum resolution soft-X-ray framing imaging system |
| CN106199677A (en) * | 2016-08-30 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of X-ray spectrum is measured and frame imaging system |
| CN108614389A (en) * | 2018-05-16 | 2018-10-02 | 中国工程物理研究院上海激光等离子体研究所 | A kind of quasi- monochromatic imaging device of plasma self-luminous grenz ray and installation method |
| CN109164077A (en) * | 2018-09-05 | 2019-01-08 | 中国工程物理研究院激光聚变研究中心 | A kind of fluorescence imaging method and device |
| CN109613596A (en) * | 2019-01-14 | 2019-04-12 | 中国工程物理研究院激光聚变研究中心 | Method for measuring special energy section X-ray signal |
| CN109975857A (en) * | 2019-05-06 | 2019-07-05 | 中国工程物理研究院激光聚变研究中心 | A kind of Multichannel narrow band grenz ray image-forming assembly |
| CN111487261A (en) * | 2020-04-26 | 2020-08-04 | 中国工程物理研究院上海激光等离子体研究所 | Quasi-monoenergetic backlight shadow imaging method based on 19.6nm soft X-ray |
| CN112798625A (en) * | 2021-02-09 | 2021-05-14 | 中国工程物理研究院激光聚变研究中心 | Ultrahigh space-time resolution X-ray imaging diagnosis device |
| CN113655512A (en) * | 2021-06-29 | 2021-11-16 | 中国工程物理研究院激光聚变研究中心 | Method for measuring symmetry of X-ray radiation in black cavity M-band |
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2014
- 2014-05-15 CN CN201420245964.8U patent/CN203870391U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103955108A (en) * | 2014-05-15 | 2014-07-30 | 中国工程物理研究院激光聚变研究中心 | Multiple-energy-point spectrum resolution soft-X-ray framing imaging system |
| CN106199677A (en) * | 2016-08-30 | 2016-12-07 | 中国工程物理研究院激光聚变研究中心 | A kind of X-ray spectrum is measured and frame imaging system |
| CN106199677B (en) * | 2016-08-30 | 2019-02-01 | 中国工程物理研究院激光聚变研究中心 | A kind of measurement of X-ray spectrum and frame imaging system |
| CN108614389B (en) * | 2018-05-16 | 2019-10-22 | 中国工程物理研究院上海激光等离子体研究所 | A kind of quasi- monochromatic imaging device of plasma self-luminous grenz ray and installation method |
| CN108614389A (en) * | 2018-05-16 | 2018-10-02 | 中国工程物理研究院上海激光等离子体研究所 | A kind of quasi- monochromatic imaging device of plasma self-luminous grenz ray and installation method |
| CN109164077B (en) * | 2018-09-05 | 2020-10-30 | 中国工程物理研究院激光聚变研究中心 | Fluorescence imaging method and device |
| CN109164077A (en) * | 2018-09-05 | 2019-01-08 | 中国工程物理研究院激光聚变研究中心 | A kind of fluorescence imaging method and device |
| CN109613596A (en) * | 2019-01-14 | 2019-04-12 | 中国工程物理研究院激光聚变研究中心 | Method for measuring special energy section X-ray signal |
| CN109975857A (en) * | 2019-05-06 | 2019-07-05 | 中国工程物理研究院激光聚变研究中心 | A kind of Multichannel narrow band grenz ray image-forming assembly |
| CN109975857B (en) * | 2019-05-06 | 2023-11-03 | 中国工程物理研究院激光聚变研究中心 | Multichannel narrow-band soft X-ray imaging assembly |
| CN111487261A (en) * | 2020-04-26 | 2020-08-04 | 中国工程物理研究院上海激光等离子体研究所 | Quasi-monoenergetic backlight shadow imaging method based on 19.6nm soft X-ray |
| CN112798625A (en) * | 2021-02-09 | 2021-05-14 | 中国工程物理研究院激光聚变研究中心 | Ultrahigh space-time resolution X-ray imaging diagnosis device |
| CN113655512A (en) * | 2021-06-29 | 2021-11-16 | 中国工程物理研究院激光聚变研究中心 | Method for measuring symmetry of X-ray radiation in black cavity M-band |
| CN113655512B (en) * | 2021-06-29 | 2024-05-07 | 中国工程物理研究院激光聚变研究中心 | Method for measuring symmetry of X-ray radiation of black cavity M band |
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