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, 1996
Filed:
Jun. 14, 1994
John Barkyoumb, Beltsville, MD (US);
Lawrence T Kabacoff, Columbia, MD (US);
David J Land, Silver Spring, MD (US);
The United States of America as represented by the Secretary of the Navy, Washington, DC (US);
Abstract
A metal or graphite fiber is suspended in a working fluid having a high refractive index change with the temperature and a modulated laser beam heats the fiber producing a synchronous thermal wave in the fiber whose amplitude and phase are measured by passing a probe laser beam through the liquid close to the fiber and converting the probe beam deflections into an electric signal. A theoretical model of the thermal wave is used to calculate the amplitude and phase shift of a theoretical thermal wave for points along the fiber from physical characteristics of the lasers and the fiber including an estimate of the thermal conductivity of the fiber. The straight line slope of the log amplitude or of the phase shift of the theoretical wave versus distance is compare against the straight line slope of the log amplitude or the phase shift versus distance for the electrical signal and the estimated value for the thermal conductivity of the fiber is adjusted until the theoretical slope and the electrical signal slope are the same which means that the thermal conductivity of the fiber has been found.