Accession Number : ADA130612

Title :   Wide Dynamic Range Array Detector for Absorbance and Rotation Spectrometry.

Descriptive Note : Interim technical rept.,


Personal Author(s) : Aiello,Peter J ; Enke,Christie G

PDF Url : ADA130612

Report Date : 05 Jul 1983

Pagination or Media Count : 29

Abstract : Photodiode detectors have a limited dynamic range relative to a photomultiplier tube. Sensitivity (in terms of intensity) can be adjusted by changing the integration time, but the integration time for all diodes in array detector is the same for any given scan, and all portions of a spectrum are acquired within the same limited dynamic range. However, the results of scans taken at varying times can be combined to produce data set with improved dynamic range. A microprocessor-controlled system for the automatic sequencing of detector integration time and the storage of only the optimum readings is described. An improvement in dynamic range of 215 times that for a single integration time is theoretically possible, but in most systems, stray light and dark current will limit the practical dynamic range attainable. (Author)

Descriptors :   *Absorption spectra, *Rotation, *Photodiodes, *Detectors, Arrays, Dynamic range, Intensity, Sensitivity, Integrated systems, Automatic, Microprocessors, Control systems

Subject Categories : Electrical and Electronic Equipment
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE