Optics: measuring and testing – By dispersed light spectroscopy
Patent
1999-08-18
2000-06-20
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
356310, G01J 300
Patent
active
060783893
ABSTRACT:
A method is presented to perform accurate property measurements using spectroscopic measurements at multiple wavelengths using nondispersed radiation with one, or sometimes two, detectors sensing all the requisite wavelengths simultaneously and calculating the value of the property by optical means. The heart of our invention is the utilization of an optical device opaque everywhere but at the finite and limited number of wavelengths where the transmittance measurements are being made, and whose transmittance at the measuring wavelengths is proportional to the coefficient for that wavelength in a predictive equation for the property value. The process which is our invention passes nondispersed light through a sample, with the transmitted light being led onto an optical device passing only the measuring wavelengths onto a detector. The optical device transmittances at the measuring wavelengths are proportional to the coefficients for those wavelengths, so that the total light passing through the optical device is actually proportional to the value of the property being measured. Our method leads to substantial reduction in instrument costs through simplified design and a reduction in components, with concomitant increased ease of use, and the elimination of the need for ancillary computational means.
REFERENCES:
Myrick et. al., Analytical Chemistry, 1998, 70, 73-82.
Evans F. L.
Snyder Eugene I.
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