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:
Dec. 24, 1985
Filed:
Apr. 03, 1984
John G Crowder, Edinburgh, GB;
EIGD Limited, Wetherby, GB;
Abstract
An infrared absorption gas detector uses the amount of IR radiation of a particular wavelength to indicate the presence of a particular component or gas. A monitoring head for such a detector includes a source (8) of IR radiation, dual IR detector elements (17, 18), an optical path which extends between the source and the elements and which includes a gas sample volume, and selectively transmitting spectral filters (20, 21) immediately in front of the detector elements (17, 18) to filter the radiation impinging on them. The optical path also includes a concave mirror (9) to provide a converging beam of radiation concentrated onto both elements of the detector. The location of the gas sample volume, the separation of the two detector elements (17, 18) of the detector, and the mirror are arranged so that IR radiation emitted by the source and impinging upon each of the detector elements follows a substantially common path through the gas sample volume. The monitoring head operates, in effect, as a single beam in both space and time while having no moving parts.