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Multiple-Path-Length Optical Absorbance CellAn optical absorbance cell that offers a selection of multiple optical path lengths has been developed as part of a portable spectrometric instrument that measures absorption spectra of small samples of water and that costs less than does a conventional, non-portable laboratory spectrometer. The instrument is intended, more specifically, for use in studying colored dissolved organic matter (CDOM) in seawater, especially in coastal regions. Accurate characterization of CDOM is necessary for building bio-optical mathematical models of seawater. The multiple path lengths of the absorption cell afford a wide range of sensitivity needed for measuring the optical absorbances associated with the wide range of concentrations of CDOM observed in nature. The instrument operates in the wavelength range of 370 to 725 nm. The major subsystems of the instrument (see figure) include a color-balanced light source; the absorption cell; a peristaltic pump; a high-precision, low-noise fiber optic spectrometer; and a laptop or other personal computer. A fiber-optic cable transmits light from the source to the absorption cell. Other optical fibers transmit light from the absorption cell to the spectrometer,
Document ID
20040001412
Acquisition Source
Stennis Space Center
Document Type
Other - NASA Tech Brief
Date Acquired
August 21, 2013
Publication Date
July 17, 2001
Subject Category
Technology Utilization And Surface Transportation
Report/Patent Number
NASA/NP-2001-10-00019-SSC
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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