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:
Aug. 20, 2002
Filed:
Jun. 26, 1998
Marie-Hélène Froger, Chateaugiron, FR;
Pascal Coudray, La Chapelle des Fougeretz, FR;
François Delumeau, Rennes, FR;
Alexandre Dodge, Guildford, GB;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
Detecting presence or absence of product in a reservoir by transmitting a signal affected by the product. The signal is detected from among other signals with which it is subsequently received by discrimination and delivery of an output signal whose level is set by the discrimination, and by sampling. Pairs of samples are correlated to obtain a true correlation value SR, where the instantaneous value of correlation between the state value B(i) and the state value B(i+Z) is summed, Z being the number of samples taken during a period T of the signal to be detected. A rate calculation is performed, during which the rate &rgr; of samples representing the presence of the signal is measured, and theoretical correlation mean values are evaluated. A decision is made by comparison of the true correlation value SR with each theoretical correlation mean value.