System and method for identifying materials using a THz spectral fingerprint in a media with high water content
First Claim
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1. A system to detect a material, comprising:
- a pulse generator to generate a terahertz pulse to excite molecules in the material that induces coherent bleaching in the material so as to reduce absorption of the terahertz pulse as it propagates through the material;
a detector to detect a signal having spectral components in the terahertz region emitted from the excitations; and
a processor to perform statistical analysis and signal processing on the detected signal to reduce false positives and false negatives of detection.
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Abstract
A material detector includes a pulse generator to generate pulses to excite molecules in the material and a detector to detect a signal generated from excited molecules in the terahertz region. Spectral features in the material are analyzed to identify the material. Detection can be performed using a nanoantenna array structure having antennas tuned to detect the expected spectral emission. The nanoantenna array can include antennas having MIM or MIIM diodes. Signal processing and statistical analysis is use to reduce false positives and false negative in identifying the material.
49 Citations
28 Claims
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1. A system to detect a material, comprising:
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a pulse generator to generate a terahertz pulse to excite molecules in the material that induces coherent bleaching in the material so as to reduce absorption of the terahertz pulse as it propagates through the material; a detector to detect a signal having spectral components in the terahertz region emitted from the excitations; and a processor to perform statistical analysis and signal processing on the detected signal to reduce false positives and false negatives of detection. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method for detecting a material, comprising:
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generating a pulse to excite molecules in the material; inducing coherent bleaching in the material so as to reduce absorption of the terahertz pulse as it propagates through the material; detecting a signal having spectral components in the terahertz region emitted from the excitations; and performing statistical analysis and signal processing on the detected signal to reduce false positives and false negatives of detection. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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24. A method for classifying THz spectral data as representing specific objects, the method comprising:
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simulating security screening scenarios; generating a terahertz pulse to interrogate the objects that induces coherent bleaching in the objects so as to reduce absorption of the terahertz pulse as it propagates through the objects; collecting THz spectral data representative of the objects in response to the generated terahertz pulse; extracting features from the magnetic data that distinguish respective objects; and performing a pre-classification optimization method on the features. - View Dependent Claims (25, 26, 27, 28)
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Specification