Soft X-ray energy spectrum reduction method based on compressed sensing

Abstract

The invention relates to a soft X-ray energy spectrum reduction method based on compressed sensing. The method comprises the following steps: performing sparse representation of a soft X-ray spectrumsignal by applying spare representation characteristics of the orthogonal basis, and constructing an observation matrix of the soft X-ray spectrum; observing a detected original soft X-ray spectrum signal by utilizing the observation matrix to obtain a converted signal, and the solving sparse coefficients of the soft X-ray spectrum according to the converted signal, and then backstepping to obtainthe soft X-ray reduced energy spectrum through the solved sparse coefficients and the sparse representation of the soft X-ray spectrum signal. Through the method disclosed by the invention, the softX-ray energy spectrum under the finite detection channel can be reduced, and the spectrum unfolding precision is guaranteed.

Description

technical field [0001] The invention relates to the technical field of spectrum reduction, in particular to a soft X-ray energy spectrum reduction method based on compressed sensing. Background technique [0002] 【ICF Laser Targeting Experiment】 [0003] Inertial confinement fusion experiment (Inertial Confinement Fusion, ICF) has become one of the important experimental means for human to explore new energy. The realization of controlled thermonuclear fusion reaction on the earth will possibly provide abundant, economical and safe energy for human beings. Inertial Confinement Fusion (ICF) is one of the promising ways to achieve controlled thermonuclear fusion. It compresses thermonuclear fuel through implosion to achieve high temperature and high density. A method of igniting and burning a nucleus to obtain fusion energy. The development of research work in the field of ICF is of great and special significance to the national economy, military applications, and basic res...

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Problems solved by technology

[0015] Generally speaking, in the prior art, under the condition of knowing the general spectrum type, appropriate spectrometer detection channels can be set, and according to different methods, there are corresponding different requirements on the number of detection channels, and some methods The more detection channels are used, the more complete the spectral restoration will be. On the contrary, if the number of spectrometer channels is reduced, the restoration accuracy will drop sharply, resulting in distortion of the spectral restoration.

For the soft X-ray energy spectrometer used for laser fusion diagnosis, as the detection energy of the spectrometer increases, more detection channels are needed to restore the spectrum type, but the structure of the spectrometer is complex, the installation position of the diagnostic hole is limited, and There will be interference in the orientation of each hole, which will affect the restoration of the spectral type. The specific performance is that the resolution accuracy is not high enough. At the same time, due to the uncertainty of the spectral type, there are high requirements for the structure of the soft X-ray energy spectrometer, and the test is difficult. Large, high test cost, such as the need to take measures such as replacing the detection channel and increasing the number of response channels without purpose

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