300 KB17 KB201020202013Cigale, BorisĐonlagić, DenisLešnik, DejanPodbreznik, PeterZazula, Damjanštevilka:2letnik:2013str. 27-30COBISSID:17820950ISSN:1855-9913URN:URN:NBN:SI:doc-IULF9T0UenLAHA, Laser and Health AcademyLAHA (Online ed.)band-pass filteringfiber-optic speckle interferometryheartbeat detectionhuman vital signsspeckle interferometryunobtrusive monitoringFiber-optic speckle interferometry for unobtrusive heartbeat monitoring|In this paper, a speckle interferometer with optical fiber system is reported for unobtrusive heartbeat monitoring. 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. Speckle images are acquired in a sequence and 1D features are extracted based on time differentiation and space averaging. These were analyzed in the frequency band that corresponds to the cardiac activity in order to detect individual heartbeats. Preliminary experiments with five young, healthy persons lying supine on a mattress with embedded optical fiber showed the proposed system and detection algorithms are highly efficientTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaLAHA Akademija za laserje in zdravje