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When “Optimal Filtering” Isn’t.
- Source :
-
IEEE Transactions on Applied Superconductivity . Jun2017 Part 1, Vol. 27 Issue 4, Part 1, p1-4. 4p. - Publication Year :
- 2017
-
Abstract
- The so-called “optimal filter” analysis of a microcalorimeter's x-ray pulses is statistically optimal only if all pulses have the same shape, regardless of energy. However, the shapes of pulses from a nonlinear detector can and do depend on the pulse energy. A pulse-fitting procedure that we call “tangent filtering” accounts for the energy dependence of the shape and should, therefore, achieve superior energy resolution. We take a geometric view of the pulse-fitting problem and give expressions to predict how much the energy resolution stands to benefit from such a procedure. We also demonstrate the method with a case study of K-line fluorescence from several 3d transition metals. The method improves the resolution from 4.9 to 4.2 eV at the Cu K $\alpha$ line (8.0 keV). [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 10518223
- Volume :
- 27
- Issue :
- 4, Part 1
- Database :
- Academic Search Index
- Journal :
- IEEE Transactions on Applied Superconductivity
- Publication Type :
- Academic Journal
- Accession number :
- 124145836
- Full Text :
- https://doi.org/10.1109/TASC.2016.2637359