Device for detecting non-metallic objects located on a human subject
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Abstract
The field of the invention is that of devices for detecting objects concealed on human subjects. These devices are more particularly dedicated to the surveillance and protection of airport areas and transport airplanes. Currently, the devices rely either on X-ray detection or on microwave imaging. In the former case, the system can prove hazardous to human beings, and in the other case, the device raises ethical problems. The invention proposes a device whose operation relies on the reflective properties of the microwave signals polarized by the suspect objects that we are seeking to detect. This device can be portable or installed on security gates. This technique is simple to design, inexpensive, does not require any great computing power and is very well suited to the objects to be detected. The complete measurement is extremely quick and requires no sophisticated measuring instrument.
38 Citations
33 Claims
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1-17. -17. (canceled)
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18. A device for detecting objects placed on a human subject, said device comprising:
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a source for generating a microwave signal comprising means for generating the signal in a known state of polarization, said signal illuminating said area of the body at a non-zero angle of incidence;
a horn for sending said signal, said horn illuminating an area of the body of said human subject;
a horn for receiving the signal reflected by said area;
a structure bearing at least the sending horn and the receiving horn;
means of analyzing said reflected signal comprising first means for determining the energy and polarimetric characteristics of the reflected signal, second means for determining from said characteristics the presence of objects placed on said human subject and third means for warning of said presence. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33)
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33-1. The detection device as claimed in claim 18, comprising means of measuring the temperature of the human body.
Specification