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:
May. 15, 2012
Filed:
Jun. 02, 2008
Jacques David, Montastruc, FR;
Tan-hoa Vuong, Carcassonne, FR;
Bastien Roucaries, Balma, FR;
Bertrand Nogarede, Coursan, FR;
Raymond Crampagne, Toulouse, FR;
Jacques David, Montastruc, FR;
Tan-Hoa Vuong, Carcassonne, FR;
Bastien Roucaries, Balma, FR;
Bertrand Nogarede, Coursan, FR;
Raymond Crampagne, Toulouse, FR;
Institut National Polytechnique de Toulouse, Toulouse, FR;
Abstract
The invention relates to the detection of liquid in a cavity of a structure, e.g. a sandwich-structure cell with honeycomb core and carbon fiber composite coating. The structure is subjected to a mechanical vibration, at a frequency fin the audible range, by an excitation wave, the area being explored is subjected to an incident electromagnetic wave and the reflected electromagnetic wave is analyzed to deduce therefrom the presence or the absence of liquid in cavities. The Faraday wave induced on the surface of the liquid in the cavity comprises subharmonic frequencies of fwhich modulate the reflected electromagnetic wave and make it possible to identify the presence of liquid. A detection apparatus comprises an excitation wave generation device for generating the vibration excitation wave, an electromagnetic wave generation device for generating the incident electromagnetic wave, a measuring device for detecting and measuring the reflected electromagnetic wave, and a signal processor.