High Optical Density Measuring Spectrometer.
Patent, filed 29 Sep 89, patented 24 Sep 91,
DEPARTMENT OF THE NAVY WASHINGTON DC
Pagination or Media Count:
An apparatus is disclosed for measuring the spectra of a high optical density sample having substantially known optical properties. In a preferred embodiment, the apparatus comprises a laser for producing a light beam and Raman cell responsive to the light beam for generating a first light containing a plurality of preselected wavelength components an optical system for directing the first light through the sample a dispersion device for spatially separating the first light passed through the sample into its plurality of preselected wavelength components a plurality of light detectors positioned to respectively receive the spatially-separated preselected components into a plurality of associated photocurrents having amplitudes respectively representative of the numbers of photons in the spatially-separated preselected wavelength components and a photon counter for respectively converting the plurality of associated photocurrents into a plurality of photon counts corresponding to the transmittance of the sample at the respective preselected wavelength components of the first light passing through the sample.
- Test Facilities, Equipment and Methods