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:
Nov. 20, 2007
Filed:
Jun. 07, 2007
Heiner Politze, Neuss, DE;
Ralf Sprenger, Duisburg, DE;
Tido Krippendorf, Erkelenz, DE;
Waldemar Ollik, Rheinsserg, DE;
Heiner Politze, Neuss, DE;
Ralf Sprenger, Duisburg, DE;
Tido Krippendorf, Erkelenz, DE;
Waldemar Ollik, Rheinsserg, DE;
Novar GmbH, Neuss, DE;
Abstract
The sensitivity of scattered-light fire detectors for small particles can be increased substantially when blue light is introduced into the measuring volume in addition to an infrared radiation and the scattered radiation produced by the particles is measured and evaluated separately from each other in the infrared and blue region both in the forward scattering region as well as in the backward scattering region. This can be realized by a fire detector that includes two transmitter LEDs () and two photodetectors (), with these components being arranged such that the photodetectors receive both the forward scattered radiations as well as the backward scattered radiations of the longer and shorter wavelengths separately from each other. A multi-channel evaluation circuit is provided downstream of the photodetectors.