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:
Sep. 24, 2002
Filed:
Jul. 24, 2000
Lee Richman, Poole, GB;
Zellweger Analytics Limited, Poole, GB;
Abstract
The present invention relates to the infrared detection of hydrocarbon gases; infrared light from a source ( ) is passed through a filter ( ) to produce a beam ( ) passing through a space ( ), which can potentially contain hydrocarbon gases. The wavelength of the beam ( ) contains a wavelength that is absorbed by hydrocarbon gases (sample wavelength) and a wavelength that is not absorbed by hydrocarbon gases (reference wavelength). The beam ( ) falls on a detector that contains sensors ( ) that receive light that has passed through respective filters ( ). Sample filter ( ) allows a single wavelength to be transmitted; reference filter ( ) allows two wavelength bands to be transmitted, the bands having wavelengths located on either side of the sample wavelength in order to eliminate the effects of atmospheric conditions that are unconnected with hydrocarbon gases.