The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 11, 2011
Filed:
Apr. 10, 2007
Albert Randow, Bruchkoebel, DE;
Helmut Dandl, Eichstaett, DE;
Hans Krause, Bad Nauheim, DE;
Emerson Process Management GmbH & Co. OHG, Wessling, DE;
Abstract
In a method and apparatus for measuring the optical absorption of samples having a light source (), a photoelectric converter (), a measurement beam path extending between the light source () and the converter (), in which path the sample to be examined is arranged, a reference beam path extending between the light source () and the converter (), in which path a reference sample is arranged, and a motor-driven chopper disc (), the chopper disc () is configured with a first number of first openings () unblocking only the measurement beam path and a second number of second openings () unblocking only the path for the reference beam. A lock-in amplifier () and a device () for synchronising the lock-in amplifier () with the chopper disc () is connected to the converter () and an evaluation circuit () establishes the quotient of the transmitted intensity of the reference beam path detected by the converter () and the transmitted intensity of the measurement beam path detected by the converter () as a measurement for the concentration of the sample in such a way that the decrease in the intensity of the beam by absorption leads to an increase in sensitivity.