CN204988507U - Transmittance grating spectrometer with wide range measuring range is distinguishd to high register for easy reference - Google Patents
Transmittance grating spectrometer with wide range measuring range is distinguishd to high register for easy reference Download PDFInfo
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- CN204988507U CN204988507U CN201520725043.6U CN201520725043U CN204988507U CN 204988507 U CN204988507 U CN 204988507U CN 201520725043 U CN201520725043 U CN 201520725043U CN 204988507 U CN204988507 U CN 204988507U
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- slit
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- density
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Abstract
The utility model provides a transmittance grating spectrometer with wide range measuring range is distinguishd to high register for easy reference, the transmittance grating spectrometer including incident slit, transmittance grating, stripe camera and with stripe camera assorted photocathode slit and photocathode, X ray that the object sent through the transmittance grating chromatic dispersion, forms the spectrum that two resolution ratio are different through the incident slit, and two spectrum misplace on the space, and photocathode slit before the stripe camera keeps off and removes unnecessary spectrum, can obtain the X ray spectrum of the resolution of high space -time, wide region on the stripe camera. The utility model discloses a transmittance grating spectrometer can obtain higher register for easy reference resolution ratio on surveying the basis of register for easy reference scope guaranteeing to be applicable to the measurement of time -resolved spectrum, precision measurement has wide application prospect to the X ray register for easy reference.
Description
Technical field
The utility model belongs to x-ray imaging field, is specifically related to a kind of high spectrum and differentiates the transmission grating spectrometer with wide range measurement range.
Background technology
The measurement of the power spectrum of X-ray spectrum, energy and spatial and temporal distributions has been widely used in fluid physics, material science, Surface Science, fusion physics and astrophysics.For laser fusion, the X-ray spectrum launched by Study of Laser and Plasma Interaction, can understand the detailed characteristics of plasma, comprises plasma electron temperature, ion temperature and evolution process etc.The important instrument that transmission grating spectrometer is diagnosed as Soft X-ray Spectra, owing to having, spectrum resolution is high, survey spectral limit is wide and structure simple, has been widely used in the precision measurement of Soft X-ray Spectra.
Existing transmission grating spectrometer, be by transmission grating and scanning camera coupling obtain time, empty resolved spectroscopy, and transmission grating is same line to density grating, in acquisition time resolution X-ray spectroscopy procedure, there is following deficiency: be 1. used alone low line to density grating, can measure spectrum in a big way, but due to the restriction of streak camera photocathode length, measured spectral resolution is also restricted; 2. be used alone high line to density grating, obtained spectral resolution can be improved, but due to the restriction of streak camera photocathode length, institute's light-metering spectral limit is restricted.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of high spectrum and differentiates the transmission grating spectrometer with wide range measurement range.
The technical solution of the utility model is as follows:
High spectrum of the present utility model differentiates the transmission grating spectrometer with wide range measurement range, be characterized in, described transmission grating spectrometer comprises incident slit element, transmission grating element and streak camera, and described entrance slit element, transmission grating element and streak camera are arranged successively in the z direction of light path.Described transmission grating element comprises low line to density grating and high line to density grating.Described streak camera comprises photocathode slit element and photocathode element, described photocathode slit element and photocathode element are arranged successively in the z direction of light path.
When laser action is on target, produce X ray, the x-ray source produced is by entrance slit element, through low line to density grating and high line to density grating dispersion interaction, form the spectrum that two resolution is different, before streak camera, add photocathode slit element, reduce the interference of two grating dispersion light, gear, except unnecessary spectrum, by streak camera scanning, can obtain X ray spectrum.Wherein, x-ray source is L to the distance of transmission grating
1, transmission grating element is L to the distance of photocathode slit element
2.
Described entrance slit element is fixed on before transmission grating element, entrance slit element is carved with slit A and slit B.The length of slit A is greater than the length of low line to density grating, and center overlaps in z direction to the center of density grating with low line; The length of slit B is greater than the length of high line to density grating, and center overlaps in z direction to the center of density grating with high line.The width of slit A and slit B is D
1, slit width is relevant with grating spectrometer spectral resolution.
Described transmission grating element comprises low line to density grating and high line to density grating.Low line to density grating line to density be 1000 to 2000 lines right/millimeter; High line to density grating line to density be 2000 to 5000 lines right/millimeter.Low line to density grating and high line to density grating inside edge at x direction distance X
0, its value size is determined by institute's light-metering spectral width; Low line to density grating and high line to density grating center at y direction distance Y
0, its value size is determined by institute's light-metering spectral limit and spectral resolution.Low line is used for measuring low energy region grenz ray region to density grating, and high line can section grenz ray region in being used for measuring to density grating.Low line is respectively the shortest and most long wavelength measured by density grating
with
, high line is respectively the shortest and most long wavelength measured by density grating
with
.The formula of spectral resolution is as follows:
(1)
In formula (1), d is screen periods, and s is the spot size of x-ray source.
Described streak camera comprises photocathode slit element and photocathode element.Described photocathode slit element and photocathode element are at the z direction horizontal arrangement of light path.
Described photocathode slit element is carved with slit C and slit D.Slit C bottom and slit D top are symmetrical in y direction, and slit D bottom center overlaps in z direction to density grating center with high line.Slit C and slit D width are D
2.Slit C length is Y
1, slit D length is Y
2.Slit C and slit D inside edge are at x direction distance X
0, slit C and slit D width.
Before described photocathode slit element is fixed on photocathode element, photocathode slit element is carved with two length differences, slit that width is equal, the horizontal distance X of two slits
0.
Photocathode slit can reduce the interference of grating dispersion light, and gear, except unnecessary spectrum, is acquisition time resolved spectroscopy Primary Component.Meanwhile, the large I of photocathode slit width value determines the resolution of streak camera, and span is 100 ~ 300 microns.
Photocathode slit is covered after described photocathode is close to photocathode slit.Length value is Y
1+ Y
2, width value equals 2D
2+ X
0.The incident wavelength of x-ray source
dispersion relation on photocathode can be expressed as:
(2)
In formula (1), m is optical grating diffraction progression.Then the wavelength of dispersion on photocathode can be expressed as:
(3)
D in formula (2)
1for low line is to the cycle of density grating, d
2for high line is to the cycle of density grating.Wherein Section 1 is the length Y of slit C
1, Section 2 is the length Y of slit D
2.Y is the length of photocathode, therefore Y=Y
1+ Y
2.
The power spectrum resolving power of this grating spectrometer
for:
(4)
High spectrum of the present utility model differentiates institute's light-metering spectral limit and the spectral resolution that can improve transmission grating spectrometer with the transmission grating spectrometer of wide range measurement range simultaneously, and be applicable to the measurement of time resolved spectroscopy, to X-ray spectrum precision measurement, there is broad prospect of application.
Accompanying drawing explanation
Fig. 1 is that high spectrum of the present utility model differentiates the light channel structure schematic diagram with the transmission grating spectrometer of wide range measurement range;
Fig. 2 is the entrance slit part drawing in transmission grating spectrometer of the present utility model;
Fig. 3 is the transmission grating part drawing in transmission grating spectrometer of the present utility model;
Fig. 4 is the photocathode slit element figure in transmission grating spectrometer of the present utility model;
Fig. 5 is the light path exploded view of transmission grating spectrometer of the present utility model;
In figure, the low line of 1.X radiographic source 2. entrance slit element 3. transmission grating element 4. streak camera 5. photocathode slit element 6. photocathode element 7. slit A8. slit B9. to the high line of density grating 10. to density grating 11. slit C12. slit D.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Following examples only for illustration of the utility model, and are not limitation of the utility model.The personnel of relevant technical field are not when departing from spirit and scope of the present utility model, and can also make a variety of changes, replace and modification, therefore equal technical scheme also belongs to category of the present utility model.
Embodiment 1
Fig. 1 is that high spectrum of the present utility model differentiates the light channel structure schematic diagram with the transmission grating spectrometer of wide range measurement range, Fig. 2 is the entrance slit part drawing in transmission grating spectrometer of the present utility model, Fig. 3 is the transmission grating part drawing in transmission grating spectrometer of the present utility model, Fig. 4 is the photocathode slit element figure in transmission grating spectrometer of the present utility model, Fig. 5 is the light path exploded view of transmission grating spectrometer of the present utility model.In Fig. 1 ~ Fig. 5, high spectrum of the present utility model is differentiated and is comprised incident slit element 2, transmission grating element 3 and streak camera 4 with the transmission grating spectrometer of wide range measurement range, and described entrance slit element 2, transmission grating element 3 and streak camera 4 are arranged successively in the z direction of light path.Described transmission grating element 3 comprises low line to density grating 9 and high line to density grating 10.Described streak camera 4 comprises photocathode slit element 5 and photocathode element 6, described photocathode slit element 5 and photocathode element 6 are arranged successively in the z direction of light path.The X ray that x-ray source 1 produces is through entrance slit element 2, and transmission grating element 3 dispersion, form the spectrum that two resolution is different, two spectrum spatially misplace, and after streak camera 4 scans, obtain X ray spectrum.
Before described entrance slit element 2 is fixed on transmission grating element 3, entrance slit element 2 is carved with slit A7 and slit B.
Described photocathode slit element 5 is carved with slit C11 and slit D12; Slit C11 bottom and slit D12 top are symmetrical in y direction, and slit D12 bottom center overlaps in z direction to density grating 10 center with high line.
Described photocathode element 6 to be fixed on after photocathode slit element 5 and to cover photocathode slit.
High spectrum of the present utility model differentiates the measurement that can be used for Soft X-ray Spectra with the transmission grating spectrometer of wide range measurement range.Choose in experiment low line to density grating 9 line to density be 2000 lines right/millimeter, high line to density grating 10 line to density be 5000 lines right/millimeter, two area of rasters are 1 × 1mm
2.
Transmission grating 2 is measured energy district and is required to cover 100eV ~ 5000eV(0.248nm ~ 12.4nm), therefore
,
.Choose slit A7 and slit B8 width D
1be
, x-ray source 1 width is
, L
1=1500mm, as shown in Figure 5.Simultaneously in order to make low line have a stable transition to density grating 9 and high line to density grating 10 pairs of power spectrum resolving powers,
place chooses power spectrum resolving power
.
The experimentally requirement of condition, show that the principle of spectrometer design has: a) covering all can district; B) all record length is no more than photocathode size 30mm; C) power spectrum resolving power is 10.Therefore the design parameter of grating spectrometer is obtained by formula (2) and (4).
Optimization distance can be obtained
, after the optimization asked further
place's wavelength is: 1.14nm, is about 1.09keV.Therefore can low line to density grating 9 to survey spectral limit be 0.1 ~ 1.09keV, power spectrum resolving power:
, spectral resolution is 0.11nm; High line to density grating 10 to survey spectral limit be 1.09 ~ 5keV, power spectrum resolving power:
, spectral resolution is 0.05nm.Low line can be asked again the dispersion length Y of density grating 9 on photocathode 6 simultaneously
1for 23.9mm; High line is to the dispersion length Y of density grating 10 on photocathode 6
2for 6mm.Line to density grating 9 with high line to the vertical distance Y of density grating 10
0for 3.5mm, horizontal distance X
0for 1mm.
Embodiment 2
The present embodiment is identical with the light channel structure of embodiment 1, and difference is, choose in experiment low line to density grating 9 line to density be 2000 lines right/millimeter, high line to density grating 10 line to density be 5000 lines right/millimeter, two area of rasters are 1 × 1mm
2.Low line to density grating 9 with high line to the vertical distance Y of density grating 10
0for 3.5mm, horizontal distance X
0for 1mm.X-ray source 1 is to the distance L of transmission grating 3
1=1500mm, transmission grating 3 is to the distance L of photocathode 6
2=1037mm, the length of photocathode 6 is 30mm.
The width D of slit A7 and slit B8 is chosen in experiment
1for
, x-ray source 1 width is
.Therefore can low line to density grating 9 power spectrum resolving power be
, spectral resolution is 0.03nm, to survey spectral limit be 0.1 ~ 0.90keV; High line to density grating 10 power spectrum resolving power is
, spectral resolution is 0.07nm, to survey spectral limit be 0.90 ~ 5keV.Low line is to the record length Y of density grating 9 on photocathode 6
1for 22.8mm; High line is to the record length Y of density grating 10
2for 7.14mm.
Embodiment 3
The present embodiment is identical with the light channel structure of embodiment 1, and difference is, in experiment, transmission grating 3 type can be rectangular raster, also can be single diffraction order grating.Choose low line to density grating 9 line to density be 1000 lines right/millimeter, high line to density grating 10 line to density be 3300 lines right/millimeter, two area of rasters are 5 × 0.2mm
2.Low line to density grating 9 with high line to the vertical distance Y of density grating 10
0for 6.27mm, horizontal distance X
0for 1mm.X-ray source 1 is to the distance L of transmission grating 3
1=4850mm, transmission grating 3 is to the distance L of photocathode 6
2=1914mm, the length of photocathode 6 is 30mm.
The width D of slit A7 and slit B8 is chosen in experiment
1for
, x-ray source 1 width is
.Therefore can low line to density grating 9 power spectrum resolving power be
, spectral resolution is 0.09nm, to survey spectral limit be 0.1 ~ 0.89keV; High line to density grating 10 power spectrum resolving power is
, spectral resolution is 0.03nm, to survey spectral limit be 0.89 ~ 5keV.Low line is to the record length Y of density grating 9 on photocathode 6
1for 22.8mm; High line is to the record length Y of density grating 10
2for 7.14mm.
Claims (5)
1. one kind high spectrum differentiates the transmission grating spectrometer with wide range measurement range, it is characterized in that, described transmission grating spectrometer comprises incident slit element (2), transmission grating element (3) and streak camera (4), and described entrance slit element (2), transmission grating element (3) and streak camera (4) are arranged successively in the z direction of light path; Described transmission grating element (3) comprises low line to density grating (9) and high line to density grating (10); Described streak camera (4) comprises photocathode slit element (5) and photocathode element (6), described photocathode slit element (5) and photocathode element (6) are arranged successively in the z direction of light path; The X ray that x-ray source (1) produces is through entrance slit element (2), and transmission grating element (3) dispersion, form the spectrum that two resolution is different, two spectrum spatially misplace, and after streak camera (4) scanning, obtain X ray spectrum.
2. high spectrum according to claim 1 differentiates the transmission grating spectrometer with wide range measurement range, it is characterized in that, it is front that described entrance slit element (2) is fixed on transmission grating element (3), (2) are carved with slit A(7 with entrance slit element) and slit B(8), slit A(7) with slit B(8) width is D
1; Slit A(7) length be greater than the length of low line to density grating (9), slit A(7) center overlap in z direction with the center of low line to density grating (9); Slit B(8) length be greater than the length of high line to density grating (10), slit B(8) center overlap in z direction with the center of high line to density grating (10).
3. high spectrum according to claim 1 is differentiated and the transmission grating spectrometer of wide range measurement range, it is characterized in that, described low line to density grating (9) line to density be 1000 to 2000 lines right/millimeter; High line to density grating (10) line to density be 2000 to 5000 lines right/millimeter; Low line is X to density grating (10) inside edge in x direction distance to density grating (9) and high line
0; Low line is Y to density grating (10) center in y direction distance to density grating (9) and high line
0.
4. high spectrum according to claim 1 differentiates the transmission grating spectrometer with wide range measurement range, it is characterized in that, described photocathode slit element (5) is carved with slit C(11) and slit D(12); Slit C(11) bottom and slit D(12) top is symmetrical in y direction, slit D(12) bottom center overlaps in z direction to density grating (10) center with high line; Slit C(11) with slit D(12) width is equal, width value scope is 100 ~ 300 microns; Slit C(11) length is Y
1, slit D(12) and length is Y
2; Slit C(11) and slit D(12) inside edge distance X in the x-direction
0.
5. high spectrum according to claim 1 is differentiated and the transmission grating spectrometer of wide range measurement range, it is characterized in that, described photocathode element (6) is fixed on photocathode slit element (5) afterwards and cover photocathode slit; The length value of photocathode element (6) is slit C(11) and slit D(12) length sum, width value equals slit C, slit D and inside edge distance sum in the x-direction thereof.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520725043.6U CN204988507U (en) | 2015-09-18 | 2015-09-18 | Transmittance grating spectrometer with wide range measuring range is distinguishd to high register for easy reference |
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|---|---|---|---|
| CN201520725043.6U CN204988507U (en) | 2015-09-18 | 2015-09-18 | Transmittance grating spectrometer with wide range measuring range is distinguishd to high register for easy reference |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067117A (en) * | 2015-09-18 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range |
| CN107843342A (en) * | 2017-12-07 | 2018-03-27 | 中国工程物理研究院激光聚变研究中心 | One kind transmission and reflective single diffraction order grating spectrometer |
| CN114034222A (en) * | 2021-11-08 | 2022-02-11 | 上海市高级技工学校 | High-precision digital display vernier caliper and measuring method thereof |
-
2015
- 2015-09-18 CN CN201520725043.6U patent/CN204988507U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105067117A (en) * | 2015-09-18 | 2015-11-18 | 中国工程物理研究院激光聚变研究中心 | Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range |
| CN107843342A (en) * | 2017-12-07 | 2018-03-27 | 中国工程物理研究院激光聚变研究中心 | One kind transmission and reflective single diffraction order grating spectrometer |
| CN114034222A (en) * | 2021-11-08 | 2022-02-11 | 上海市高级技工学校 | High-precision digital display vernier caliper and measuring method thereof |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20160120 Effective date of abandoning: 20170412 |
|
| AV01 | Patent right actively abandoned |