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Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range

A transmission grating and measurement range technology, applied in the field of X-ray imaging, can solve the problems of spectral resolution limitation, spectral range limitation, streak camera photocathode length limitation, etc., and achieve the effect of broad application prospects.

Active Publication Date: 2015-11-18
LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] The existing transmission grating spectrometer is to couple the transmission grating and scanning camera to obtain the time-space resolution spectrum, and the transmission gratings are all the same line-pair density gratings. In the process of obtaining the time-resolved X-ray spectrum, there are the following deficiencies: 1. Using a low line pair density grating alone can measure a wide range of spectra, but due to the limitation of the photocathode length of the streak camera, the measured spectral resolution is also limited; 2. Using a high line pair density grating alone can improve the The spectral resolution obtained, but the measured spectral range is limited due to the limitation of the photocathode length of the streak camera

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  • Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range
  • Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range
  • Transmission grating spectrometer with high spectral resolution and wide spectrum measurement range

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Embodiment 1

[0033] figure 1 It is a schematic diagram of the optical path structure of the transmission grating spectrometer with high spectral resolution and wide spectral measurement range of the present invention, figure 2 is the incident slit component diagram in the transmission grating spectrometer of the present invention, image 3 It is the transmission grating component diagram in the transmission grating spectrometer of the present invention, Figure 4 It is the photocathode slit component diagram in the transmission grating spectrometer of the present invention, Figure 5 It is an exploded view of the optical path of the transmission grating spectrometer of the present invention. exist Figure 1~Figure 5 Among them, the transmission grating spectrometer with high spectral resolution and wide-spectrum measurement range of the present invention includes an incident slit element 2, a transmission grating element 3 and a streak camera 4, and the described incident slit element ...

Embodiment 2

[0042] The optical path structure of this embodiment is the same as that of Embodiment 1, the difference is that in the experiment, the density of the 9 line pairs of the low line pair density grating is 2000 line pairs / mm, and the density of the 10 line pairs of the high line pair density grating is 5000 line pairs / mm. mm, the area of ​​both gratings is 1×1mm 2 . The vertical distance Y between the low line pair density grating 9 and the high line pair density grating 10 0 3.5mm, horizontal distance X 0 1mm. The distance L from the X-ray source 1 to the transmission grating 3 1 =1500mm, the distance L between transmission grating 3 and photocathode 6 2 =1037mm, the length of photocathode 6 is 30mm.

[0043] In the experiment, the width D of slit A7 and slit B8 is selected 1 for , the width of X-ray source 1 is . Therefore, the spectral resolving power of the low line pair density grating 9 can be obtained as , the spectral resolution is 0.03nm, and the measured s...

Embodiment 3

[0045] The optical path structure of this embodiment is the same as that of Embodiment 1, except that the type of transmission grating 3 in the experiment can be a rectangular grating or a single-stage diffraction grating. Select the 9 line pair density of the low line pair density grating as 1000 line pairs / mm, the 10 line pair density of the high line pair density grating as 3300 line pairs / mm, and the area of ​​both gratings is 5×0.2mm 2 . The vertical distance Y between the low line pair density grating 9 and the high line pair density grating 10 0 6.27mm, horizontal distance X 0 1mm. The distance L from the X-ray source 1 to the transmission grating 3 1 =4850mm, the distance L between transmission grating 3 and photocathode 6 2 =1914mm, the length of photocathode 6 is 30mm.

[0046] In the experiment, the width D of slit A7 and slit B8 is selected 1 for , the width of X-ray source 1 is . Therefore, the spectral resolving power of the low line pair density grati...

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Abstract

The invention provides a transmission grating spectrometer with high spectral resolution and a wide spectrum measurement range. The transmission grating spectrometer comprises an incident slit, a transmission grating, a streak camera, and a photocathode slit and a photocathode which match the streak camera. X ray emitted by an object passes through the incident slit and is dispersed by the transmission grating to form two spectra different in resolution, the two spectra are dislocated in space, redundant spectrum is blocked when the two spectra pass through the photocathode slit in front of the streak camera, and therefore, X-ray spectra of high space-time resolution and wide range can be obtained on the streak camera. The transmission grating spectrometer of the invention can achieve higher spectral resolution on the basis of ensuring the measured spectral range, is applicable to time-resolved spectrum measurement, and has a wide application prospect in X-ray spectrum precision measurement.

Description

technical field [0001] The invention belongs to the field of X-ray imaging, in particular to a transmission grating spectrometer with high spectral resolution and wide spectral measurement range. Background technique [0002] The measurement of energy spectrum, energy and space-time distribution of X-ray spectrum has been widely used in fluid physics, material science, surface science, fusion physics and astrophysics. Taking laser fusion as an example, by studying the X-ray spectrum emitted by the interaction between laser and plasma, we can understand the detailed characteristics of plasma, including plasma electron temperature, ion temperature and evolution process. As an important instrument for soft X-ray spectrum diagnosis, transmission grating spectrometer has been widely used in the precise measurement of soft X-ray spectrum due to its high spectral resolution, wide measurement range and simple structure. [0003] The existing transmission grating spectrometer is to ...

Claims

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Application Information

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IPC IPC(8): G01J3/28
Inventor 易涛王传珂刘慎业王保清李晋朱效立谢长青
Owner LASER FUSION RES CENT CHINA ACAD OF ENG PHYSICS
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