Line tracing method and apparatus utilizing non-linear junction detecting locator probe
First Claim
1. A method of tracing a conductive line and identifying electronic devices electrically connected to said line, said method comprising:
- generating a detection signal having a first fundamental frequency;
coupling said detection signal to said conductive line;
tracking said conductive line by remotely tracing the signal strength of said detection signal radiating from said conductive line; and
locating said electronic devices electronically connected to said conductive line by remotely detecting harmonic signals produced by said electronic devices at a second harmonic frequency of said detection signal in response to said electronic devices being exposed to said detection signal.
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Accused Products
Abstract
A method, device, and apparatus for tracing a conductive line and locating any concealed surveillance devices coupled to the line uses a signal generator to produce a test signal having a fundamental frequency which is coupled to the line under test. The test signal flowing through the line under test creates electromagnetic waves that propagate through the atmosphere away from the line. A portable locator probe is used to detect the radiated signal and thus the conductive line by detecting the magnitude of the radiated signal. As the locator probe is moved closer to the line, the amplitude of the detected signal increases. In addition, the portable locator probe detects harmonic signals radiated from nonlinear junctions coupled to the line at harmonic frequencies of the fundamental test signal. By examining the relative strengths of the second and third harmonic signals, a user can determine if the detected non-linear junction is being produced by a semiconductor or a corrosive/dissimilar metal type non-linear junction. A DC bias voltage can be used to improve the responses of any semiconductor based non-linear junctions. Any semiconductor junctions located with the probe are manually examined to determine the cause of the non-linear junction.
32 Citations
26 Claims
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1. A method of tracing a conductive line and identifying electronic devices electrically connected to said line, said method comprising:
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generating a detection signal having a first fundamental frequency; coupling said detection signal to said conductive line; tracking said conductive line by remotely tracing the signal strength of said detection signal radiating from said conductive line; and locating said electronic devices electronically connected to said conductive line by remotely detecting harmonic signals produced by said electronic devices at a second harmonic frequency of said detection signal in response to said electronic devices being exposed to said detection signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A device for tracing a transmission line and locating any non-linear junctions coupled to said transmission line that may be indicative of a concealed surveillance device, said device comprising:
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a signal generating and transmitting device for generating a first signal having a fundamental frequency and coupling said signal to said transmission line wherein said signal generator includes DC bias voltage circuitry for generating a DC bias voltage which is connected to the conducting line to enhance the response of said non-linear junctions coupled to said transmission line; and a portable locator probe having an antenna for remotely detecting a relative strength of said first signal at said first fundamental frequency radiating, from said transmission line and detecting a relative signal strength of at least one harmonic frequency signal radiating from a non-linear junction coupled to said transmission line. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An apparatus for determining a location of an at least partially concealed conductive line and detecting the presence of non-linear junctions coupled to said electrically conductive line, said apparatus comprising:
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a signal generator for generating a test signal haying at least one fundamental frequency component and coupling said test signal to said electrically conductive line; and a locator probe for detecting, said conductive line by detecting signals radiated from said conductive line at said fundamental frequency and detecting, said non-linear junctions by detecting signals radiating from said non-linear junctions; wherein said signal generator alters the frequency of said test signal such that a single frequency receiver in said locator probe can be utilized to detect both said electrically conductive line and said non-linear junction harmonic signals. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method of tracing a concealed conductive line and identifying electronic devices coupled to said line, said method comprising:
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generating a detection signal having a first fundamental frequency; coupling said detection signal to said concealed conductive line; tracking said concealed conductive line by remotely tracing the signal strength of said detection signal radiating from said conductive line; and locating electronic devices coupled to said conductive line by remotely detecting harmonic signals radiated front said electronic devices at harmonic frequencies of said detection signal in response to said detection signal. - View Dependent Claims (24, 25, 26)
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Specification