Remote detection of covertly carried metal objects
First Claim
1. An apparatus for remotely detecting metal objects carried by a person, comprising:
- an antenna;
an signal generator coupled to the antenna operable to cause the antenna to emit an electromagnetic signal at a human body self-resonant frequency in the VHF range;
a data capture device operable to capture response signal energy received by the antenna, the response signal energy being provided from the person in response to the first electromagnetic signal; and
processing circuitry operable to determine whether the response signal energy has a change in signal characteristics due to mutual impedance phenomena between the object and the human body that occurs when the person is carrying a metal object, to determine whether or not the person is carrying an appreciable amount of metal.
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Abstract
An apparatus for remotely detecting metal objects carried by a person includes an antenna and a signal generator coupled to the antenna operable to cause the antenna to emit a first electromagnetic signal to the person at a frequency that is known to be resonant with the human body. The apparatus further includes a data capture device operable to capture response signal energy received by the antenna, the response signal energy being provided from the person in response to the first electromagnetic signal. Processing circuitry for the apparatus is operable to determine whether the response signal energy is indicative whether or not the person is carrying an appreciable amount of metal, based on reference response templates for persons that are known to be metal-free.
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Citations
10 Claims
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1. An apparatus for remotely detecting metal objects carried by a person, comprising:
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an antenna; an signal generator coupled to the antenna operable to cause the antenna to emit an electromagnetic signal at a human body self-resonant frequency in the VHF range; a data capture device operable to capture response signal energy received by the antenna, the response signal energy being provided from the person in response to the first electromagnetic signal; and processing circuitry operable to determine whether the response signal energy has a change in signal characteristics due to mutual impedance phenomena between the object and the human body that occurs when the person is carrying a metal object, to determine whether or not the person is carrying an appreciable amount of metal. - View Dependent Claims (2, 3)
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4. An apparatus for remotely detecting metal objects carried by a person, comprising:
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an antenna; means for capturing response signal energy received by the antenna, the response signal energy being provided from the person at a human body self-resonant frequency in the VHF range, and in response to a first electromagnetic signal in the VHF range making contact with the person at the same said human body self-resonant frequency in the VHF range; and
,processing means for determining whether the response signal energy has a change in signal characteristics due to mutual impedance phenomena between the object and the body that occurs when the person is carrying a metal object, to determine whether or not the person is carrying an appreciable amount of metal. - View Dependent Claims (5, 6)
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7. A method for remotely detecting metal objects carried by a person, said method comprising the steps of:
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A) capturing response signal energy received with an antenna, the response signal energy being provided from the person at a human body self-resonant frequency in the VHF spectrum and in response to a first electromagnetic signal making contact with the person; and B) determining whether a change in signal characteristics due to mutual impedance phenomena at the self-resonant frequency in the VHF range between the object and the human body, which occurs when the person is carrying a metal object, exists in the response signal energy. - View Dependent Claims (8, 9, 10)
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Specification