Open AccessCounting‐loss correction for X‐ray spectroscopy using unit impulse pulse shaping
Author(s) -
Hong Xu,
Zhou Jianbin,
Ni Shijun,
Ma Yingjie,
Yao Jianfeng,
Zhou Wei,
Liu Yi,
Wang Min
Publication year - 2018
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577518000322
Subject(s) - impulse (physics) , dead time , optics , detector , preamplifier , photon counting , physics , pulse shaping , pulse (music) , channel (broadcasting) , impulse response , spectroscopy , materials science , computer science , mathematics , telecommunications , optoelectronics , laser , amplifier , mathematical analysis , quantum mechanics , cmos
High‐precision measurement of X‐ray spectra is affected by the statistical fluctuation of the X‐ray beam under low‐counting‐rate conditions. It is also limited by counting loss resulting from the dead‐time of the system and pile‐up pulse effects, especially in a high‐counting‐rate environment. In this paper a detection system based on a FAST‐SDD detector and a new kind of unit impulse pulse‐shaping method is presented, for counting‐loss correction in X‐ray spectroscopy. The unit impulse pulse‐shaping method is evolved by inverse deviation of the pulse from a reset‐type preamplifier and a C‐R shaper. It is applied to obtain the true incoming rate of the system based on a general fast–slow channel processing model. The pulses in the fast channel are shaped to unit impulse pulse shape which possesses small width and no undershoot. The counting rate in the fast channel is corrected by evaluating the dead‐time of the fast channel before it is used to correct the counting loss in the slow channel.