Digital Data Acquisition/Analysis System For Infrared Spectrophotometry

Charles A. Burke; Daniel S. Coolidge

doi:10.1117/12.957719

13 November 1980 Digital Data Acquisition/Analysis System For Infrared Spectrophotometry

Charles A. Burke, Daniel S. Coolidge

Proceedings Volume 0190, Los Alamos Conference on Optics 1979; (1980) https://doi.org/10.1117/12.957719
Event: Los Alamos Conference on Optics '79, 1979, Los Alamos, United States

Abstract

Spectral measurements often require higher quality data than that provided by available spectrophotometers. The capabilities of the digital data acquisition and analysis system for infrared spectrophotometry are presented. The system includes a Data General Corporation NOVA 2/10 computer interfaced to a modified Perkin-Elmer Model 180 Spectrophotometer. Increased accuracy is obtained through computer control of the monochromator, live zero correction at each wavelength through sample beam shutter control, and enhanced signal-to-noise ratio through multiple data sampling at each wavelength. Routine use of the system includes spectral characteristic determination of bandpass interference filters, dichroics (including polarization effect), neutral density filters, and gas samples used for calibration purposes. Spectra obtained as digital data are stored on disk for subsequent analysis including normalization, smoothing for signal enhancement, multiple spectra averaging to determine a scanning filter's effective response and extraction of such parameters as pass-band location and shape, location of minima and maxima, and spectral throughput over a given spectral range. Optical system spectral transfer functions are obtained by convolution of the spectral transfer functions determined for each optical element in a system.

Citation Download Citation

Charles A. Burke and Daniel S. Coolidge "Digital Data Acquisition/Analysis System For Infrared Spectrophotometry", Proc. SPIE 0190, Los Alamos Conference on Optics 1979, (13 November 1980); https://doi.org/10.1117/12.957719

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