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:
Jul. 25, 1978
Filed:
May. 03, 1977
Toshiyoshi Hamada, Kawasaki, JP;
Fuji Electric Co., Ltd., Kawasaki, JP;
Abstract
An infrared gas analyzer includes side-by-side measuring and comparison vessles S, V containing sample and reference gases alternately exposed to infrared light through a rotary chopper CH. The end windows of the vessels are transparent, and a detector D containing two series chambers D1, D2 filled with a gas of the same kind as the component gas to be analyzed is axially disposed below the vessels. A capacitive diaphragm sensor is coupled between the chambers to detect pressure variation differences therebetween, and an adjustable reflecting means is disposed below the transparent bottom window of the second chamber to reflect back a portion of the light energy passing therethrough. The degree of reflection is suitably adjusted so that any interference gas component has an equal influence on the absorption curves of both chambers, whereby its effects are self-cancelling. The same structural concept of an adjustable reflecting means disposed below the bottom window of the second chamber may also be used to implement zero adjustment when a reference gas is circulated through the vessel.