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We demonstrate experimentally the detection, in a remote and noncontact manner, of human life signs using a high-sensitivity pulsed laser vibrometer. The high surface displacement detection sensitivity of the photo-electromotive-force (photo-EMF) pulsed laser vibrometer, combined with its tolerance to the presence and moderate temporal variations of optical speckles in the light beams, allows the...
Summary for only given. Adaptive photodetectors under consideration are based on the effect of non-steady-state photo-EMF. The effect relates to the property of photoconductive and photorefractive materials to store 2-D light patterns in the form of corresponding spatial electric charge/field distributions in their volume. In the case of standard photorefractive recording, this pattern is transformed...
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