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:
Aug. 21, 1984
Filed:
Oct. 05, 1981
Dale F Warnke, Irvine, CA (US);
Carl N Cederstrand, Brea, CA (US);
Beckman Instruments, Inc., Fullerton, CA (US);
Abstract
An improved nondispersive infrared gas analyzer having at least one pneumatic or Luft-type detector and at least one black body type detector located one behind the other along the optical axis of the analyzer. In the preferred embodiment, a black body detector is exposed to radiation from a sample cell through an intervening pneumatic detector. The pneumatic detector absorbs radiation at specific infrared wavelengths, while the black body detector absorbs radiation substantially uniformly at all wavelengths. Signals from the pneumatic detector and the black body detector are combined electronically in an improved signal processing circuit to provide an output signal that is substantially free of the effects of disturbing influences such as infrared source intensity variations, mechanical vibrations and shock, and the presence of interfering compounds.