Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs

Peter Podbreznik; Denis Donlagic; Dejan Lesnik; Boris Cigale; Damjan Zazula

doi:10.1117/1.JBO.18.10.107001

2 October 2013 Cost-efficient speckle interferometry with plastic optical fiber for unobtrusive monitoring of human vital signs

Peter Podbreznik, Denis Donlagic, Dejan Lesnik, Boris Cigale, Damjan Zazula

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Journal of Biomedical Optics, Vol. 18, Issue 10, 107001 (October 2013). https://doi.org/10.1117/1.JBO.18.10.107001

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 98.8%±1.5% and 97.9%±2.3% , sensitivities of 99.4%±0.6% and 95.3%±3% , 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.

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Peter Podbreznik, Denis Donlagic, Dejan Lesnik, Boris Cigale, and 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

Published: 2 October 2013

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KEYWORDS

Speckle

Interferometry

Sensors

Vital signs

Speckle interferometry

Phase only filters

Polymer optical fibers

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