Optics: measuring and testing – By dispersed light spectroscopy – Utilizing a spectrometer
Patent
1991-08-01
1993-07-27
Turner, Samuel A.
Optics: measuring and testing
By dispersed light spectroscopy
Utilizing a spectrometer
356361, 356128, G01B 902
Patent
active
052314669
ABSTRACT:
There is provided an apparatus for monitoring the relative concentration of an analyte in a fluid stream, with such apparatus including a capillary tube for containing the flowing fluid, optics for directing a single beam of monochromatic light through the capillary tube to produce a diffraction pattern having a number of interference fringes. A translatable photodiode is provided to monitor a portion of one of the fringes passing through a light limiting slit, whereby a signal proportional to the concentration of the analyte in the fluid is produced based upon the varying intensity of the monitored fringe. The capillary tube is preferably provided as a fused silica member having an inner flow diameter of 100 micrometers or less.
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Cortes Hernan J.
Erskine Steven R.
Pfeiffer Curtis D.
Walbroehl Yvonne M.
Dow Chemical Company
Turner Samuel A.
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