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:
Jul. 24, 2012
Filed:
Aug. 06, 2008
Carlos Kenichi Suzuki, Campinas, BR;
Edmilton Gusken, Bauru, BR;
Allan Caro Mercado, Campinas, BR;
Eric Fujiwara, São Paulo, BR;
Eduardo Ono, Distrito de Barão Geraldo, BR;
Carlos Kenichi Suzuki, Campinas, BR;
Edmilton Gusken, Bauru, BR;
Allan Caro Mercado, Campinas, BR;
Eric Fujiwara, São Paulo, BR;
Eduardo Ono, Distrito de Barão Geraldo, BR;
Universidade Estadual de Campinas—Unicamp, Campinas—SP, BR;
Abstract
The present invention relates to a thermally compensated optical sensing system for identifying various types of liquid fuels and/or the ratio in liquid fuel mixtures on real time. In this system, an optical fiber is used as a light guide and a sensor device for determining the refractive index of liquid fuels through the principle of reflectivity. Starting from a light source, light is transmitted interiorly of the optical fiber to the test probe which is in contact with the fuel. The optical signal resulting from the interaction between light and fuel is a function of refractive indexes of the optical fiber and the fuel, the wavelength of light used, and the fuel temperature. The system proposed herein relates to the use of this optical system in liquid fuels by using optical fibers having suitable refractive indexes as a function of the fuel type and/or fuel mixture being analyzed, allowing the sensitivity of the optical system to be optimized according to application requirements.