Effect of noise on the identification of digitized Bragg Curves

J. J. Vega* and R. Reynoso

Departamento del Acelerador, Gerencia de Ciencias Básicas, Instituto Nacional de Investigaciones Nucleares,Apartado Postal 18-1027, 11801, México D. F., México

Recibido el 2 de marzo de 2006
Aceptado el 18 de agosto de 2006

Abstract

Recently, pulse shape analysis, PSA, assisted by artificial neural networks, ANN, used as pattern identifiers has received attention by several groups interested in analyzing different kind of signals. In this, as well as in many experimental fields, noise is a ubiquitous known undesirable problem when dealing with experimental signals, requiring a considerable effort to restrain it as much as possible in order to improve the reliability of the measurements. Nonetheless, the remaining noise demands a careful analysis in order to be able to asses its effect. In this paper we present results of the effect of noise on the performance of an ANN used to assist PSA of synthetic Bragg curves.

Keywords: Neural networks; Bragg curve spectroscopy; digital pulse-shape analysis; pattern identification.

Resumen

Recientemente, el análisis de forma de pulsos, AFP, auxiliado por redes neuronales artificiales, RNA, usadas como identificadores de patrones, ha despertado la atención de varios grupos interesados en le análisis de diferentes tipos de señales. En éste, como en muchos otros campos, el ruido es un conocido e indeseable problema muy común cuando se manejan señales experimentales; requiriéndose de un considerable esfuerzo para disminuirlo lo mas posible con objeto de mejorar la confiabilidad de las mediciones. Sin embargo, el ruido residual demanda un análisis cuidadoso para poder estimar su efecto. En este trabajo, se presentan resultados de los efectos del ruido sobre el desempeño de una RNA usada como auxiliar para el AFP de curvas de Bragg sintéticas.

Descriptores: Redes neuronales; espectroscopia de curva de Bragg; análisis digital de forma de pulsos; identificación de patrones.

PACS: 07.05.Kf; 07.05.Mh; 29.40.Cs

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