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Intensity Calibration for Raman Multichannel Spectrometers
FLORIDA STATE UNIV TALLAHASSEE DEPT OF CHEMISTRY
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Multichannel spectrometers have been important in the recent development of Raman and other types of spectroscopy. The array detectors used in multichannel spectrometers have raised several technical problems together with the advantages that these detectors offer over single channel spectrometers. An adequate sensitivity calibration is among the most challenging problems. A calibrated white light source is required to correct both channel- to-channel sensitivity variations and the variations of each channel with wavelength. Several attempts to solve these problems have been made, but present methods are either too tedious to do in routine operations or they only correct sensitivity variations within a spectral window. These last methods do not allow for smooth connection of several spectral windows to obtain a whole spectrum for a given compound. We will report our findings on a new suitable and reliable laboratory white light source and correction method for multichannel spectrometers. A discussion in depth of the calibration transfer from the National Institute of Standards and Technology NIST Standard of Spectral Radiance to the laboratory working standard source, the determination of the white light correction factor, and the testing methods will be presented.
APPROVED FOR PUBLIC RELEASE