Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/75567
Type: Artigo de periódico
Title: SIGNAL-TO-NOISE OPTIMIZATION AND EVALUATION OF A HOME-MADE VISIBLE DIODE-ARRAY SPECTROPHOTOMETER
Author: RAIMUNDO, IM
PASQUINI, C
Abstract: This paper describes a simple low-cost multichannel visible spectrophotometer built with an RL512G EGG-Reticon photodiode array. A symmetric Czerny-Turner optical design was employed; instrument control was via a single-board microcomputer based on the 8085 Intel microprocessor. Spectral intensity data are stored in the single-board's RAM and then transferred to an IBM-AT 386SX compatible microcomputer processes the data to recover transmittance, absorbance or relative intensity of the spectra. The signal-to-noise ratio and dynamic range were improved by using variable integration times, which increase during the same scan; and by the use of either weighted or unweighted sliding average of consecutive diodes. The instrument is suitable for automatic methods requiring quasi-simultaneous multiwavelength detections, such as multivariative calibration and flow-injection gradient scan techniques.
Country: Inglaterra
Editor: Taylor & Francis Ltd
Rights: fechado
Identifier DOI: 10.1155/S146392469300029X
Date Issue: 1993
Appears in Collections:Unicamp - Artigos e Outros Documentos

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