Chang'e 2 gamma spectrum and nonlinear spectrum drift calibration method based on energy correspondence

Abstract

The invention discloses a Chang'e 2 gamma spectrum and nonlinear spectrum drift calibration method based on energy correspondence. The method comprises the steps that 1, a spectral line y (n) to be calibrated is read in, n is the number of track addresses, and an array p (n) is newly set up and used for storing the calibrated spectral line; 2, the energy-track address corresponding relation of y (n) is subjected to linear fitting according to the feature peak position and energy information of the spectral line y (n), and a relational expression Eny=a2*CHy+b2 is obtained; 3, a new track address of each corresponding standard spectrum of the spectral line y (n) is calculated, and the track address of the ith corresponding standard spectrum is shown in the description; 4, whether p (chi) is zero or not is judged, if p (chi) is zero, p (chi) is equal to y (i), or otherwise, p (chi) is equal to the formula shown in the description; 5, the step 3 and the step 4 are executed cyclically till all spectral data is processed. According to the method, nonlinear drift of the spectral line can be effectively calibrated, the element feature peak position and peak area of the obtained spectral line are located within a consistent range, and powerful assistance is provided for subsequent analysis of a Chang'e 2 gamma spectrum and acquiring of element moon distribution useful information.

Description

technical field [0001] The invention relates to a method for correcting the nonlinear spectral drift of the Chang'e-2 gamma spectrum based on energy correspondence. Background technique [0002] The Chang'e-2 gamma spectrometer is one of the main payloads of the Chang'e-2 satellite, and its scientific goal is to detect the main material components of the lunar surface. During the processing of the spectral data obtained by the Chang'e-2 gamma spectrometer, it was found that there was an obvious phenomenon of nonlinear spectral drift. Since the spectral lines need to be accumulated and averaged of the full spectrum data before the analysis, the peak position and peak area shift caused by the spectral line drift will cause the information of the characteristic peaks of the elements to be averaged out after the accumulation. [0003] The traditional gamma spectral drift correction methods are divided into two types: with reference source and without reference source. The spect...

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Problems solved by technology

Since the spectral lines need to be accumulated and averaged for the full spectrum data before the analysis, the peak position and peak area shift caused by the spectral line drift will cause the element characteristic peak information to be averaged out after the accumulation

[0003] The traditional gamma spectral drift correction methods are divided into two types: with reference source and without reference source. The spectral drift correction with reference source forms a relatively stable reference peak in the instrument spectrum according to the gamma rays emitted by the reference source. When the spectral line After the drift occurs, the correction is completed based on the reference peak position; the correction of the spectral drift without a reference source mainly uses computer software to achieve drift correction, and the correction methods include linear correction and nonlinear correction. The linear correction algorithm is mainly for spectral lines. linear drift, and the current nonlinear drift algorithm is not very applicable to the large amount of Chang'e-2 gamma spectrum

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