11 July 2007 Contact probe pressure effects in skin multi-spectral photoplethysmography
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A novel technique ensuring parallel recording of reflection photoplethysmography signals in broad spectral range has been tested for assessment of pressure-induced vascular changes at various depths from the skin surface. PPG signals have been simultaneously detected at three combinations of the cw laser wavelengths 405 nm, 532 nm, 645 nm, 807 nm and 1064 nm. The PPG baseline responses to the probe-skin contact pressure changes and shapes of the PPG pulses originated from the same heartbeat but recorded at different wavelengths have been detected and analyzed.
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Janis Spigulis, Janis Spigulis, Lasma Gailite, Lasma Gailite, Renars Erts, Renars Erts, Alexey Lihachev, Alexey Lihachev, } "Contact probe pressure effects in skin multi-spectral photoplethysmography", Proc. SPIE 6628, Diagnostic Optical Spectroscopy in Biomedicine IV, 66281F (11 July 2007); doi: 10.1117/12.727985; https://doi.org/10.1117/12.727985

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