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Journal of Biomedical Optics

Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs
Author(s): Peter Podbreznik; Denis Donlagic; Dejan Lesnik; Boris Cigale; Damjan Zazula
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Paper 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.

Paper Details

Date Published: 2 October 2013
PDF: 9 pages
J. Biomed. Opt. 18(10) 107001 doi: 10.1117/1.JBO.18.10.107001
Published in: Journal of Biomedical Optics Volume 18, Issue 10
Show Author Affiliations
Peter Podbreznik, Univ. of Maribor (Slovenia)
Denis Donlagic, Univ. of Maribor (Slovenia)
Dejan Lesnik, Piktronic d.o.o. (Slovenia)
Boris Cigale, Univ. of Maribor (Slovenia)
Damjan Zazula, Univ. of Maribor (Slovenia)

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