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. 19, 2000
Filed:
Jun. 04, 1999
Bruce R Barsumian, Cookeville, TN (US);
Thomas H Jones, Cookeville, TN (US);
Research Electronics International, Cookeville, TN (US);
Abstract
A non-linear junction detector designed for counter surveillance measures achieves superior performance by transmitting a series of pulses and receiving harmonics of the transmitted pulse signals that are re-radiated by a non-linear junction such as would be found in an eavesdropping device containing a semiconductor. The transmit power of the series of pulses is varied and the amplitudes of the harmonics received at the different power levels are compared to determine the type of non-linear junction detected. The received harmonic signals are demodulated to create signals having a frequency in the audible range of human ears. The demodulated signals are broadcast so that an operator of the non-linear junction detector can audibly distinguish between the noise responses produced by the different types of non-linear junctions. The harmonic signals are analyzed to determine if the harmonic, signals correspond to signals produced by a known type of non-linear junction device such as a video camera or tape recorder. Data generated by the non-linear junction detector is displayed to an operator of the detector and may be stored for later analysis.