Alan D Small

US Patent:

43670415, Jan 4, 1983

Filed:

Aug 25, 1980

Appl. No.:

6/180867

Inventors:

Paul A. Webb - Lawrenceville GA
Alan H. Small - Atlanta GA
Dean M. Ball - Norcross GA

Assignee:

Micromeritics Instrument Corporation - Norcross GA

International Classification:

G01N 2185

US Classification:

356 72

Abstract:

A chromatograph detection system for differentiating pure components of a chromatogram for accurate measurement or collection of such components. The light beam passing through a single detector flow cell is split and absorbance is detected at two differing wavelengths. Undesirable overlapping components are eliminated by scaling the chromatogram at one wavelength to equal the chromatogram at the other wavelength, and then subtracting the chromatograms. Purity of component substances is determined by continuously dividing the chromatogram signals to determine the absorbance ratio and its characteristics over time.