CN118311007B - X-ray image offline reading system and method based on time-sharing and repetition frequency method - Google Patents
X-ray image offline reading system and method based on time-sharing and repetition frequency method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000013307 optical fiber Substances 0.000 claims abstract description 41
- 229910052709 silver Inorganic materials 0.000 claims abstract description 7
- 239000004332 silver Substances 0.000 claims abstract description 7
- 238000013519 translation Methods 0.000 claims description 14
- 239000003623 enhancer Substances 0.000 claims description 9
- 230000005284 excitation Effects 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 7
- 239000005365 phosphate glass Substances 0.000 claims description 6
- -1 silver activated phosphate Chemical class 0.000 claims description 6
- 229910021607 Silver chloride Inorganic materials 0.000 claims description 4
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims description 4
- 230000001934 delay Effects 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011521 glass Substances 0.000 abstract description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract 2
- 229910019142 PO4 Inorganic materials 0.000 abstract 1
- 239000010452 phosphate Substances 0.000 abstract 1
- 238000001444 catalytic combustion detection Methods 0.000 description 38
- 230000005855 radiation Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 230000004927 fusion Effects 0.000 description 5
- 238000003384 imaging method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005424 photoluminescence Methods 0.000 description 3
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
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- 241001460678 Napo <wasp> Species 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical class OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/11—Details
- G21B1/23—Optical systems, e.g. for irradiating targets, for heating plasma or for plasma diagnostics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
- G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
- G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
- G01N23/04—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and forming images of the material
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21B—FUSION REACTORS
- G21B1/00—Thermonuclear fusion reactors
- G21B1/03—Thermonuclear fusion reactors with inertial plasma confinement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/07—Investigating materials by wave or particle radiation secondary emission
- G01N2223/073—Investigating materials by wave or particle radiation secondary emission use of a laser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2223/00—Investigating materials by wave or particle radiation
- G01N2223/10—Different kinds of radiation or particles
- G01N2223/101—Different kinds of radiation or particles electromagnetic radiation
- G01N2223/1016—X-ray
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Abstract
The invention discloses an X-ray image off-line reading system and method based on a time-sharing and repetition frequency method, wherein the system comprises the following steps: the output end of the pulse repetition frequency laser is connected with the input end of the bifurcated optical fiber, and laser emitted by the pulse repetition frequency laser propagates through the bifurcated optical fiber; the first output end of the bifurcated optical fiber is arranged around the sample, so that laser emitted by the pulse repetition frequency laser emits out through the first output end and irradiates the excited sample; the second output end of the bifurcated optical fiber is connected with the input end of the photoelectric converter; the output end of the photoelectric converter is electrically connected with the input end of the delay device; the output end of the delay device is connected with the gate-control enhanced CCD electric signal; the gated, enhanced CCD receives the emitted light from the excited sample. The invention adopts a time-sharing and repetition frequency method and an off-line reading mode, and solves the problems of poor signal-to-noise ratio, higher lower limit of measured signal strength and insufficient spatial resolution of the existing silver activated glass phosphate (Ag-PG) reading technology.
Description
Technical Field
The invention relates to the technical field of X-ray diagnosis in laser inertial confinement fusion ICF, in particular to an X-ray image off-line reading system and method based on a time-sharing and repetition frequency method.
Background
The laser-driven Inertial Confinement Fusion (ICF) utilizes high-energy laser to be incident on the inner wall of a pure gold material cavity to generate X-rays, and the X-rays ablate and compress a deuterium-tritium target pill positioned in the center of the gold cavity, so that nuclear fusion is initiated. The recording and reading of these X-ray image information is an important diagnostic technique for the intensive study of the ICF black cavity and implosion related physical processes, as it is able to describe the morphology of these physical processes and invert a series of key parameters such as temperature, density, pressure etc.
Currently, the recording device of the X-ray image in the international ICF field mainly includes an X-ray CCD, an X-ray imaging plate, an X-ray film, and the like. Researchers have recently developed X-ray image recordings using radiant photoluminescent materials, representative of which are silver activated phosphate glasses (Ag-ACTIVATED PHOSPHATE GLASSE, ag-PG for short). In the aspect of the reading technology, the X-ray CCD adopts electronic on-line reading and is easy to be interfered by high neutron yield and strong electromagnetic pulse radiation. While the X-ray imaging plate adopts off-line reading, the interference is avoided, but the space resolution of the off-line reading system is only 60-100 mu m lower. Although the off-line reading of X-ray films is spatially resolved to a few μm, their dynamic range is too small, only tens of times, and X-ray CCDs and X-ray imaging plates can be up to 5 orders of magnitude. The recording space resolution of Ag-PG is better than 1 μm, the dynamic range is more than 6 orders of magnitude, however, the common reading technology does not have the space resolution capability when the Ag-PG is irradiated by excitation light, so that the X-ray image signals recorded by the Ag-PG are read. Even with spatial resolution, the influence of excitation light and ambient light on the effective signal of the emitted light is difficult to be well eliminated, so that the signal-to-noise ratio is low (several times), the lower limit of the measured signal intensity is high (tens of mGy), and the spatial resolution is insufficient (tens of micrometers).
Thus, the X-ray image reading technique that can be employed in ICF suffers from the following deficiencies under severe experimental conditions of laser fusion ignition: ① The online reading of the X-ray CCD is easy to be interfered by high neutron yield and strong electromagnetic pulse radiation; ② Offline reading of the X-ray imaging plate is not sufficiently spatially resolved; ③ The offline reading dynamic range of the X-ray film is insufficient; ④ The Ag-PG reading technology has poor signal-to-noise ratio, higher lower limit of measured signal strength and insufficient spatial resolution.
Disclosure of Invention
The invention aims to provide an X-ray image offline reading system based on a time-sharing and repetition frequency method, which solves the problems of poor signal-to-noise ratio, higher lower limit of measured signal strength and insufficient spatial resolution of Ag-PG reading technology under severe experimental conditions of laser fusion ignition, and has the advantages of no interference of high neutron yield and strong electromagnetic pulse radiation and large dynamic range; the second objective of the present invention is to provide an offline X-ray image reading method based on time-sharing and repetition frequency methods.
The first aspect of the present invention provides an X-ray image offline reading system based on a time-sharing and repetition frequency method, for reading an X-ray image in a sample, wherein the sample forms a color center after being irradiated by X-rays, the X-ray image is recorded, and the reading system comprises a pulse repetition frequency laser, a bifurcated optical fiber, a photoelectric converter, a delay device and a gate-controlled enhanced CCD, wherein:
The output end of the pulse repetition frequency laser is connected with the input end of the bifurcated optical fiber, and laser emitted by the pulse repetition frequency laser propagates through the bifurcated optical fiber;
The first output end of the bifurcated optical fiber is arranged around the sample, so that laser emitted by the pulse repetition frequency laser is emitted through the first output end and irradiates to excite the sample; the second output end of the bifurcated optical fiber is connected with the input end of the photoelectric converter;
The output end of the photoelectric converter is electrically connected with the input end of the delay device;
The output end of the delay device is connected with the gating enhancement type CCD electric signal;
the gated, enhanced CCD receives the emitted light from the excited sample.
In the above technical means, after the sample forming the color center is irradiated by excitation light with a certain wavelength, the color center emits visible emission light with another wavelength, and the intensity of the visible light is proportional to the intensity of the absorbed X-rays, so that quantitative reading of the X-ray image information is realized. The method comprises the steps of adopting an off-line reading mode to ensure that the reading of a sample is not interfered by high neutron yield and strong electromagnetic pulse radiation, and placing the sample recorded with an X-ray image signal in a field of view of a gating enhanced CCD; adopting a time-sharing method, and opening a gating enhanced CCD to read an image after pulse laser irradiation of the equal pulse repetition frequency laser is finished for a short period of time through delay design of a delay device; and (3) exciting the sample by repeatedly irradiating with a pulse repetition frequency laser in a short time by adopting a repetition frequency method, and superposing visible light image signals obtained by each irradiation by using a gate-controlled enhanced CCD to obtain an image with high signal-to-noise ratio, low signal intensity lower limit, high spatial resolution and large dynamic range.
Further, the sample includes a silver activated phosphate glass that is a combination of AgCl and Al (PO 3)3、NaPO3 or Mg (any one or more of PO 3)2).
Further, the pulse repetition frequency laser is a pulse laser capable of emitting laser with the wavelength of 300-410 nm, the repetition frequency is 2-3000 HZ, the pulse width of single pulse laser is 3-10 ns, and the energy is 10-1000 mu J.
Further, the core diameter of the bifurcated optical fiber is 0.5-1 mm, and the splitting ratio is 5: 5-9: 1, wherein the stronger light exits through the first output end of the bifurcated optical fiber and irradiates the excitation sample.
Further, the photoelectric converter is a fast response photoelectric converter with response time in ns order.
Further, the delayer is a delayer with delay time of 10 ns-100 us.
Further, the gating enhancement type CCD comprises an enhancer and a CCD, wherein the gain multiple of the enhancer is between tens and thousands of times, and the CCD is a visible light CCD with the gating time reaching ns order.
Further, still include light-proof case, light-proof section of thick bamboo, objective, dichroism mirror and barrel lens, wherein:
The sample is arranged in the light-proof box, and the first output end of the bifurcated optical fiber extends into the light-proof box;
The inside of a light-proof cylinder is followed the direction of propagation of the emission light that the sample was aroused and produced sets gradually objective, dichroscope and barrel lens, the one end of light-proof cylinder set up in the light-proof case, and be in set up on the object plane of objective the sample, the other end of light-proof cylinder is connected gating enhancement mode CCD.
Further, the device also comprises a two-dimensional translation table, wherein the two-dimensional translation table is arranged inside the light-proof box, and the sample is placed on the two-dimensional translation table.
The second aspect of the present invention provides an offline X-ray image reading method based on a time-sharing and repetition frequency method, the offline X-ray image reading method is applied to the offline X-ray image reading system based on the time-sharing and repetition frequency method, and the offline X-ray image reading method comprises the following steps:
The pulse repetition frequency laser emits pulse laser, when the pulse repetition frequency laser passes through the bifurcated optical fiber, a part of pulse laser is output through a first output end of the bifurcated optical fiber and irradiates to excite the sample, and the sample is excited to emit emission light; the other part of pulse laser is output through the second output end of the bifurcated optical fiber, converted into an electric signal by the photoelectric converter and sent into a delay device;
And after the delayer delays the electric signal, outputting a trigger signal to the gating enhancement type CCD to enable the gating enhancement type CCD to open a shutter, and receiving the emitted light emitted by the sample to read an X-ray image.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
The X-ray image offline reading system based on the time-sharing and repetition frequency method adopts the time-sharing and repetition frequency method and an offline reading mode, so that the problems of poor signal-to-noise ratio, higher lower limit of measured signal strength and insufficient spatial resolution of the existing Ag-PG reading technology are solved. The signal-to-noise ratio of the Ag-PG reading technology in the ICF is increased to more than 20, the lower limit of the measured signal strength is reduced to hundreds of mu Gy, the spatial resolution is increased to more than 5 mu m, and the method has the advantages of being free from high neutron yield and strong electromagnetic pulse radiation interference and wide in dynamic range, and has wide and important application prospects in the ICF.
Drawings
Fig. 1 is a schematic structural diagram of an offline X-ray image reading system based on a time-sharing and repetition frequency method according to embodiment 1 of the present invention;
Fig. 2 is a schematic diagram of a silver-activated phosphate glass Ag-PG radiation photoluminescence principle provided by an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an offline X-ray image reading system based on a time-sharing and repetition frequency method according to embodiment 2 of the present invention;
Fig. 4 is a flowchart of an offline X-ray image reading method based on a time-sharing and repetition frequency method according to an embodiment of the present invention.
Detailed Description
The drawings are for illustrative purposes only and are not to be construed as limiting the present patent;
for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions;
it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The technical scheme of the invention is further described below with reference to the accompanying drawings and examples.
Example 1
The embodiment provides an offline X-ray image reading system based on a time-sharing and repetition frequency method, which is used for reading an X-ray image in a sample, wherein the sample forms a color center after being irradiated by the X-ray, the X-ray image is recorded, as shown in fig. 1, and the reading system comprises a pulse repetition frequency laser, a bifurcated optical fiber, a photoelectric converter, a delayer and a gate-controlled enhanced CCD, wherein:
The output end of the pulse repetition frequency laser is connected with the input end of the bifurcated optical fiber, and laser emitted by the pulse repetition frequency laser propagates through the bifurcated optical fiber;
The first output end of the bifurcated optical fiber is arranged around the sample, so that laser emitted by the pulse repetition frequency laser is emitted through the first output end and irradiates to excite the sample; the second output end of the bifurcated optical fiber is connected with the input end of the photoelectric converter;
The output end of the photoelectric converter is electrically connected with the input end of the delay device;
The output end of the delay device is connected with the gating enhancement type CCD electric signal;
the gated, enhanced CCD receives the emitted light from the excited sample.
In the embodiment of the invention, after the sample records the X-ray image, the visible light emitted by the radiation photoluminescence principle is received by the gate-controlled enhanced CCD, so that the X-ray image information is indirectly read. The principle of radiative photoluminescence refers to that some few special materials (including more than twenty materials found in crystals, glass, ceramics and the like) can form electron-hole pairs under the irradiation of X-rays, and doped (such as Ag 1+、Sm3+、Eu3+ and the like) or undoped ions in the materials can combine with electrons or holes to form Color centers (CS for short, such as Ag 0/ Ag2+、Sm2+、Eu2+ and the like), so that X-ray images can be recorded, and the Color centers are formed by single atoms, so that the resolution of the X-ray images can reach the atomic level in theory. When the materials are irradiated by X rays to form color centers, the color centers are irradiated by visible excitation light with certain wavelength, and then the color centers emit visible light with other wavelength to be output, wherein the intensity of the visible light is in direct proportion to the intensity of absorbed X rays, so that quantitative reading of X-ray image information is realized.
Silver activated phosphate glass Ag-PG is used as a recording medium, and AgCl and NaPO 3,Al(PO3)3 are used for preparing the sample with the diameter of 50-80 mm and the thickness of 1mm by a melt quenching method. Electron-hole generation in Ag-PG when irradiated by X-ray) Pair, and in this case Ag-PG:
(1)
And
(2)
The Ag 0 and Ag 2+ color centers store X-ray images theoretically in atomic percent resolved recordings. Importantly, unless the recording medium is heated to 400 ℃, the Ag 0 and Ag 2+ color centers do not return to the Ag + state, which ensures the possibility of off-line time-sharing repeated frequency reading, excellent anti-interference capability and quantification capability. In addition, when the Ag-PG, ag 0 and Ag 2+ color centers at this time are irradiated with 355nm ultraviolet laser light, blue (460 nm) and orange (563 nm) visible light are emitted respectively due to electron energy level orbital transition, see FIG. 2, so that the X-ray image can be converted into a visible light image and can be read.
In further embodiments, the sample comprises a silver activated phosphate glass that is a combination of AgCl and Al (PO 3)3、NaPO3 or Mg (any one or more of PO 3)2).
In a further embodiment, the pulse repetition frequency laser is a pulse laser capable of emitting laser light with a wavelength of 300-410 nm, the repetition frequency is 2-3000 HZ, the pulse width of single pulse laser light is 3-10 ns, and the energy is 10-1000 mu J.
In a specific embodiment, the pulse repetition frequency laser is a pulse laser emitting 355nm wavelength laser, the repetition frequency is 1501HZ, the pulse width of the single pulse laser is 7ns, and the energy is 505 μj.
In a further embodiment, the core diameter of the bifurcated optical fiber is 0.5-1 mm, and the splitting ratio is 5: 5-9: 1, wherein the stronger light exits through the first output end of the bifurcated optical fiber and irradiates the excitation sample.
In a specific embodiment, the core diameter of the furcated optical fiber is 0.8mm, and the splitting ratio is 7:3.
In a further embodiment, the photoelectric converter is a fast response photoelectric converter with a response time on the order of ns.
In a further embodiment, the delayer is a delayer with a delay time of 10 ns-100 us.
In a specific embodiment, the delayer is a delayer with a delay time of 55 us.
In a further embodiment, the gated enhancement CCD comprises an enhancer and a CCD, wherein the enhancer has a gain multiple between tens and thousands of times, and the CCD is a visible light CCD with a gating time on the order of ns.
In the embodiment of the invention, the X-ray image off-line reading system based on the time-sharing and repetition frequency method adopts an off-line reading mode, thereby avoiding the interference of neutrons and electromagnetic pulses. And after each single pulse laser emitted by the pulse repetition frequency laser is finished for a period of time, an image is read, and the reading time width is controlled to be several ns to tens of mu s by the gate-control enhanced CCD, so that the interference influence of excitation light on signals is completely eliminated, and a higher signal-to-noise ratio is ensured. The time-sharing method can be adopted because when each single-pulse laser (with the wavelength of 355 nm) emitted by the pulse repetition frequency laser irradiates on the Ag-PG sample, an X-ray image is converted into a visible light image (with the wavelength of 563 nm), and the excited visible light image signal can also be maintained for about 100us after each single-pulse laser emitted by the pulse repetition frequency laser is ended. And the pulse laser emitted by the pulse repetition frequency laser irradiates the sample 500 times within 1s, the time width of each reading is controlled to be 50 mu s by the gate-controlled enhanced CCD every time, and visible light image signals obtained by each irradiation are overlapped, and the signal noise floor of each time is extremely small, so that the signal-to-noise ratio of the finally overlapped visible light image signals is high, the lower limit of the measured signal intensity is low, and the spatial resolution is high.
Specifically, when the pulse repetition frequency laser emits 500HZ pulse laser light to pass through the bifurcated optical fiber, a part of light directly illuminates the Ag-PG sample through the optical fiber; the other part of light is transmitted through the optical fiber, irradiates on the fast response photoelectric converter, is converted into an electrical signal and is sent into the delay device. After a delay of hundreds of ns to a few us, for example 900ns, a trigger signal is output to the gating enhancement CCD, so that the gating CCD opens a shutter to start receiving the visible light image signal converted by irradiating the Ag-PG sample. The gating enhancement type CCD can respectively control the shutter of the CCD and the shutter of the enhancer, so that the CCD can be opened for a time width of tens of seconds, and the enhancer is set to be opened for a time width of tens of microseconds each time a pulse trigger signal arrives, so that the CCD can be overlapped with visible light image information for tens of times or even tens of thousands of times.
Example 2
The embodiment of the invention also provides the following on the basis of the embodiment 1:
The X-ray image offline reading system based on the time-sharing and repetition frequency method further comprises a light-shielding box, a light-shielding barrel, an objective lens, a dichroic mirror and a barrel lens, as shown in fig. 3, wherein:
The sample is arranged in the light-proof box, and the first output end of the bifurcated optical fiber extends into the light-proof box;
The inside of a light-proof cylinder is followed the direction of propagation of the emission light that the sample was aroused and produced sets gradually objective, dichroscope and barrel lens, the one end of light-proof cylinder set up in the light-proof case, and be in set up on the object plane of objective the sample, the other end of light-proof cylinder is connected gating enhancement mode CCD.
In a further embodiment, the device further comprises a two-dimensional translation stage, wherein the two-dimensional translation stage is arranged inside the light-proof box, the sample is placed on the two-dimensional translation stage, the two-dimensional translation stage has a translation precision reaching more than 1 mu m, has transverse and longitudinal translation functions, and has a translation stroke reaching more than 10 cm.
In a further embodiment, the objective lens is an objective lens with a magnification of 4-100 times and a numerical aperture of more than 0.14, and the cylindrical lens is an eyepiece with an image transmission function.
In the embodiment of the invention, the light-proof box and the light-proof cylinder are arranged to avoid the influence of ambient light. The Ag-PG sample can be accurately placed on the object plane of the objective lens through the translation stage, and the near total reflection of 355nm pulse repetition frequency laser and the near total transmission of 563nm visible light are carried out through the dichroic mirror, then the image is transmitted to the enhancer of the CCD through the cylindrical mirror (equivalent to an ocular lens), and finally the image is transmitted to the sensitive plane of the CCD, so that the X-ray image is read.
Example 3
This example continued to disclose the following on the basis of examples 1 and 2:
an offline X-ray image reading method based on time-sharing and repetition frequency methods is shown in fig. 4, and the offline X-ray image reading method comprises the following steps:
The pulse repetition frequency laser emits pulse laser, when the pulse repetition frequency laser passes through the bifurcated optical fiber, a part of pulse laser is output through a first output end of the bifurcated optical fiber and irradiates to excite the sample, and the sample is excited to emit emission light; the other part of pulse laser is output through the second output end of the bifurcated optical fiber, converted into an electric signal by the photoelectric converter and sent into a delay device;
And after the delayer delays the electric signal, outputting a trigger signal to the gating enhancement type CCD to enable the gating enhancement type CCD to open a shutter, and receiving the emitted light emitted by the sample to read an X-ray image.
The same or similar reference numerals correspond to the same or similar components;
the terms describing the positional relationship in the drawings are merely illustrative, and are not to be construed as limiting the present patent;
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (9)
1. An X-ray image off-line reading system based on a time-sharing and repetition frequency method for reading an X-ray image in a sample, wherein the sample forms a color center after being irradiated by X-rays, and the system is characterized by comprising a pulse repetition frequency laser, a bifurcated optical fiber, a photoelectric converter, a delayer and a gate-controlled enhanced CCD, wherein:
The output end of the pulse repetition frequency laser is connected with the input end of the bifurcated optical fiber, and laser emitted by the pulse repetition frequency laser propagates through the bifurcated optical fiber;
The first output end of the bifurcated optical fiber is arranged around the sample, so that laser emitted by the pulse repetition frequency laser is emitted through the first output end and irradiates to excite the sample; the second output end of the bifurcated optical fiber is connected with the input end of the photoelectric converter;
The output end of the photoelectric converter is electrically connected with the input end of the delay device;
The output end of the delay device is connected with the gating enhancement type CCD electric signal;
the gating enhancement CCD receives the excited light emitted by the excited sample;
The sample included a silver activated phosphate glass that was a combination of AgCl with Al (PO 3)3、NaPO3 or Mg (any one or more of PO 3)2).
2. The offline X-ray image reading system based on the time-sharing and repetition-frequency method according to claim 1, wherein the pulsed repetition-frequency laser is a pulsed laser capable of emitting laser with a wavelength of 300-410 nm, the repetition frequency is 2-3000 HZ, the pulse width of single-pulse laser is 3-10 ns, and the energy is 10-1000 μj.
3. The offline X-ray image reading system based on the time-sharing and repetition frequency method according to claim 1, wherein the core diameter of the bifurcated optical fiber is 0.5-1 mm, and the splitting ratio is 5:5 to 9:1, wherein the stronger light exits through the first output end of the bifurcated optical fiber and irradiates the excitation sample.
4. The X-ray image offline reading system based on the time-sharing and repetition-frequency method according to claim 1, wherein the photoelectric converter is a fast-response photoelectric converter with a response time on the order of ns.
5. The system for offline reading of X-ray images based on time-sharing and repetition-frequency method according to claim 1, wherein the delayer is a delayer with a delay time of 10 ns-100 us.
6. The system for offline reading of X-ray images based on time-sharing and repetition-frequency method according to claim 1, wherein the gated enhancement CCD comprises an enhancer and a CCD, wherein the gain factor of the enhancer is between tens and thousands of times, and the CCD is a visible light CCD with a gating time of the order of ns.
7. The X-ray image offline reading system based on the time-sharing and repetition-frequency method according to any one of claims 1 to 6, further comprising a light-shielding box, a light-shielding barrel, an objective lens, a dichroic mirror, and a barrel lens, wherein:
The sample is arranged in the light-proof box, and the first output end of the bifurcated optical fiber extends into the light-proof box;
The inside of a light-proof cylinder is followed the direction of propagation of the emission light that the sample was aroused and produced sets gradually objective, dichroscope and barrel lens, the one end of light-proof cylinder set up in the light-proof case, and be in set up on the object plane of objective the sample, the other end of light-proof cylinder is connected gating enhancement mode CCD.
8. The system for offline reading of X-ray images based on the time-sharing and repetition frequency method according to claim 7, further comprising a two-dimensional translation stage, wherein the two-dimensional translation stage is disposed inside the light-shielding box, and wherein the sample is placed on the two-dimensional translation stage.
9. An offline X-ray image reading method based on a time-sharing and repetition frequency method, wherein the offline X-ray image reading method is applied to the offline X-ray image reading system based on the time-sharing and repetition frequency method according to claim 8, and the offline X-ray image reading method comprises the following steps:
The pulse repetition frequency laser emits pulse laser, when the pulse repetition frequency laser passes through the bifurcated optical fiber, a part of pulse laser is output through a first output end of the bifurcated optical fiber and irradiates to excite the sample, and the sample is excited to emit excitation light; the other part of pulse laser is output through the second output end of the bifurcated optical fiber, converted into an electric signal by the photoelectric converter and sent into a delay device;
And after the delayer delays the electric signal, outputting a trigger signal to the gating enhancement type CCD to enable the gating enhancement type CCD to open a shutter, and receiving the emitted light emitted by the sample to read an X-ray image.
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