Peter Podbreznik (Author), Denis Đonlagić (Author), Dejan Lešnik (Author), Boris Cigale (Author), Damjan Zazula (Author)

Abstract

In this paper, a speckle interferometer with a plastic optical fiber system is reported for unobtrusive monitoring of heartbeat and respiration. The sensor consists of a laser diode butt-coupled to the plastic optical fiber, whose exit face projects speckle patterns onto a linear optical sensor array, which leads to a simple and cost-effective construction. Speckle images are acquired in a sequence and transformed into a 1D signal by using a phase-shifting method. Band-pass filtering and Morlet-wavelet-based multiresolutional approaches were used to analyze signals for the detection of cardiac and respiratory activities, respectively. Ten young, healthy persons participated in system testing, by lying supine on a mattress with embedded plastic optical fiber. Experimental results show the proposed system and detection algorithms are highly efficient. Sensitivities of 99.4 0.6% and 95.3 3%, precisions of 98.8 1.5% and 97.9 2.3%, and mean delays between interferometric detections and corresponding referential signals of 116.6 55.5ms and 1299.2 437.3 ms were computed for heartbeat and respiration, respectively.

Keywords

plastic optical fiber;speckle interferometry;unobtrusive monitoring;heartbeat detection;respiration detection;phase-shift method;wavelet transform;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UM FERI - Faculty of Electrical Engineering and Computer Science
UDC: 681.586
COBISS: 17034006 Link will open in a new window
ISSN: 1855-9913
Views: 1060
Downloads: 13
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Other data

Secondary language: English
URN: URN:SI:UM:
Type (COBISS): Not categorized
Pages: str. 68-72
Volume: ǂVol. ǂ2013
Issue: ǂno. ǂ1
Chronology: 2013
ID: 1439581