NUCLEAR SPECTROSCOPY PULSE-HEIGHT ANALYSIS BASED ON DIGITAL SIGNAL-PROCESSING TECHNIQUES

• Type: Article in International Scientific Journal
• Date: 1995

Authors

SIMOES, JB (Author) Other; SIMOES, PCPS (Author) Other; CORREIA, CMBA (Author) Other

Journal

Title: IEEE Transactions on Nuclear Science

Vol. 42

Pages: 700-704

ISSN: 0018-9499

Publisher: IEEE

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-001-GJ2

DOI: 10.1109/23.467890

Abstract (EN): A digital approach to pulse height analysis is presented. It consists of entire pulse digitization, using a flash analog-to-digital converter (ADC), being its height estimated by a floating point digital signal processor (DSP) as one parameter of a model best fitting to the pulse samples. The differential nonlinearity (DNL) is reduced by simultaneously adding to the pulse, prior to its digitization, two analog signals provided by a digital-to-analog converter (DAC). One of them is a small amplitude dither signal used to eliminate a bias introduced by the fitting algorithm. The other, with large amplitude, corrects the ADC nonlinearities by a method similar to the well known Gatti's sliding scale [1]. The simulations carried out showed that, using a 12-bit flash ADC, a 14-bit DAC and a dedicated floating point DSP performing a polynomial fitting to the samples around the pulse peak, it is actually possible to process about 10000 events per second, with a constant height pulse dispersion of only 4 on 8192 channels and a very good differential linearity. A prototype system based on the Texas Instruments floating point DSP TMS320C31 and built following the presented methodology has already been tested and performed as expected.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5