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:
Mar. 04, 2003
Filed:
Jun. 08, 2000
Gregory J. Fetzer, Tucson, AZ (US);
Other;
Abstract
Apparatus and method are introduced for detecting and measuring a gas within a gaseous specimen by radiation-absorption spectroscopy. The apparatus includes a housing, and a coiled waveguide arranged in the housing—with a radiation inlet for receiving radiation and a radiation outlet for emitting the received radiation. The housing has a gas entry chamber enclosing a first portion of the waveguide to receive the gas; and a gas exhaust chamber on the opposed side of the waveguide enclosing a second portion of the waveguide and adapted to exhaust the gaseous specimen. Perforated openings are formed in the first and second portions—providing short paths for flow of the specimen from the entry chamber through the guide into the exhaust chamber. A laser projects electromagnetic radiation into the inlet of the guide, and a photodetector receives the radiation from the outlet. A signal processor for analyzing the output of the detector identifies and determines the concentration of at least one gas within the gas specimen. Laser drilling and other techniques are prescribed for perforating the waveguide.