23 August 2001 Optical remote sensing of heartbeats
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Regions of the human body placed in the neighborhood of arteries or veins are periodically deflected by the passage of dilatation pulses and by body movements due to breathing. Remote, non-invasive measurement of the deflection is performed by means of optical techniques. The skin in the studied reign of the body is illuminated by a laser beam. The backscattered speckle pattern in recorded by a TV camera. The digitized images are numerically processed in order to determine the contrast of the light intensity distribution in each frame, which is a decreasing function of the instantaneous angular velocity of the reflected beam. The plot of time-integrated contrast vs. recording time is shown to closely resemble direct records of the angular deflection of the illuminated region. Also the breathing pattern is plotted in the same graphs.
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Juan Enrique Parra, Juan Enrique Parra, German Da Costa, German Da Costa, } "Optical remote sensing of heartbeats", Proc. SPIE 4368, Visualization of Temporal and Spatial Data for Civilian and Defense Applications, (23 August 2001); doi: 10.1117/12.438115; https://doi.org/10.1117/12.438115

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