System and method for detecting contraband
First Claim
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1. A method for detecting whether an object of interest is being carried by a subject, the method comprising:
- coarsely scanning the subject with an electromagnetic radiation using a plurality of frequencies of electromagnetic radiation generated by at least one of spectral tuning of a narrow band source and using multiple discrete frequency sources, wherein the frequencies are selected based upon a known spectroscopic signature of the object of interest;
measuring reflective intensity of radiation reflected from the subject; and
,without generating an image, detecting the presence or absence of the object of interest based upon the presence or absence of the known spectroscopic signature of the object of interest from the measured reflective intensity.
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Abstract
A technique is provided for detecting whether an object of interest is being carried by a subject. The technique includes coarsely scanning the subject with an electromagnetic radiation, measuring reflective intensity of radiation reflected from the subject, and detecting the presence or absence of the object of interest based upon the measured reflective intensity.
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Citations
28 Claims
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1. A method for detecting whether an object of interest is being carried by a subject, the method comprising:
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coarsely scanning the subject with an electromagnetic radiation using a plurality of frequencies of electromagnetic radiation generated by at least one of spectral tuning of a narrow band source and using multiple discrete frequency sources, wherein the frequencies are selected based upon a known spectroscopic signature of the object of interest; measuring reflective intensity of radiation reflected from the subject; and
,without generating an image, detecting the presence or absence of the object of interest based upon the presence or absence of the known spectroscopic signature of the object of interest from the measured reflective intensity. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for detecting a presence or absence of an object of interest, the method comprising:
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coarsely scanning a region of interest with an electromagnetic radiation in the terahertz range while selecting different frequencies of the electromagnetic radiation generated by at least one of spectral tuning of a narrow band source and using multiple discrete frequency sources, the electromagnetic radiation having a spot size of at least 1 centimeter at a predetermined scanning distance; measuring reflective intensity of radiation reflected from the scanned region; and
,without generating an image, detecting the presence or absence of the object of interest within the region of interest based upon the presence or absence of a spectroscopic signature of the object of interest from the measured reflective intensity. - View Dependent Claims (12, 13, 14, 15)
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16. A system for detecting whether an object of interest is being carried by a subject, the system comprising:
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a narrow band source configured to generate electromagnetic radiation by spectral tuning in terahertz range; an optical scanner configured to coarsely scan a region of interest within the subject with the generated electromagnetic radiation; and a detection subsystem configured to detect radiation reflected from the scanned region, measure reflective intensity of the reflected radiation, and, without generating an image, detect the presence or absence of the object of interest within the region of interest based upon the presence or absence of a spectroscopic signature of the object of interest from the measured reflective intensity. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification