G - Physics – 01 – N
Patent
G - Physics
01
N
73/55
G01N 21/33 (2006.01) G01N 21/55 (2006.01) G01N 21/85 (2006.01)
Patent
CA 1273223
ABSTRACT The presence and concentration of a light absorbing constituent in a fluid medium is determined in-situ by immersing in such medium a probe having a prism at one end whose refractive index is greater than that of the medium and causing light including a wavelength absorbable by such constituent to traverse an optical path through the prism and undergo successive attenuated total reflec- tions. At each reflection some of the light will be absorbed by the constituent. The intensity of light emerging from the prism is measured at one or more wavelengths, including one absorbable by such constituent. The concentration of the constituent is determined by comparison of the measured intensity with values obtained from like measurements performed on like mediums containing known concentrations of the constituent.
512256
Chrisman Ray W.
Mclachlan Richard D.
Smart & Biggar
The Dow Chemical Company
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