2 October 2013 Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs
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Abstract
A cost-efficient plastic optical fiber (POF) system for unobtrusive monitoring of human vital signs is presented. The system is based on speckle interferometry. A laser diode is butt-coupled to the POF whose exit face projects speckle patterns onto a linear optical sensor array. Sequences of acquired speckle images are transformed into one-dimensional signals by using the phase-shifting method. The signals are analyzed by band-pass filtering and a Morlet-wavelet-based multiresolutional approach for the detection of cardiac and respiratory activities, respectively. The system is tested with 10 healthy nonhospitalized persons, lying supine on a mattress with the embedded POF. Experimental results are assessed statistically: precisions of 98.81.5% and 97.92.3% , sensitivities of 99.40.6% and 95.33% , and mean delays between interferometric detections and corresponding referential signals of 116.6±55.5 and 1299.2±437.3  ms for the heartbeat and respiration are obtained, respectively.
© 2013 Society of Photo-Optical Instrumentation Engineers (SPIE)
Peter Podbreznik, Peter Podbreznik, Denis Donlagic, Denis Donlagic, Dejan Lesnik, Dejan Lesnik, Boris Cigale, Boris Cigale, Damjan Zazula, Damjan Zazula, } "Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs," Journal of Biomedical Optics 18(10), 107001 (2 October 2013). https://doi.org/10.1117/1.JBO.18.10.107001 . Submission:
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