4 May 2012 Millimeter wave I-Q standoff biosensor
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Abstract
A continuous wave (CW) 94-GHz millimeter wave (mmW) standoff biosensor has been developed for remote biometric sensing applications. The sensor measures the demodulated in-phase (I) and quadrature-phase (Q) components of the received reflected mmW signal from a subject. Both amplitude and phase of the reflected signal are obtained from downconverted I and Q channels from the quadrature mixer. The mmW sensor can faithfully monitor human vital signs (heartbeat and respiration) at relatively long standoff distances. Principle Component Analysis (PCA) is used to extract the heartbeat, the respiration and the body motion signals. The approach allows one to deduce information about amplitude and beat-to-beat rate of the respiration and the heartbeat. Experimental results collected from a subject were analyzed and compared to the signal obtained with a three-electrode ECG monitoring instrument.
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Shaolin Liao, Shaolin Liao, Sasan Bakhtiari, Sasan Bakhtiari, Thomas Elmer, Thomas Elmer, Apostolos C. Raptis, Apostolos C. Raptis, Ilya V. Mikhelson, Ilya V. Mikhelson, Alan V. Sahakian, Alan V. Sahakian, } "Millimeter wave I-Q standoff biosensor", Proc. SPIE 8371, Sensing Technologies for Global Health, Military Medicine, Disaster Response, and Environmental Monitoring II; and Biometric Technology for Human Identification IX, 83711D (4 May 2012); doi: 10.1117/12.924241; https://doi.org/10.1117/12.924241
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