A New Ultrasonic Oscillosensor and Its Application in Biological Information Measurement System Aided by Fuzzy Theory

Yuya KAMOZAKI  Toshiyuki SAWAYAMA  Kazuhiko TANIGUCHI  Syoji KOBASHI  Katsuya KONDO  Yutaka HATA  

IEICE TRANSACTIONS on Information and Systems   Vol.E90-D   No.11   pp.1864-1872
Publication Date: 2007/11/01
Online ISSN: 1745-1361
DOI: 10.1093/ietisy/e90-d.11.1864
Print ISSN: 0916-8532
Type of Manuscript: PAPER
Category: Biological Engineering
health monitoring,  ultrasonic oscillosensor,  ultrasonic wave,  recognition system of human,  heart rate monitoring system,  fuzzy theory,  

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In this paper, we describe a new ultrasonic oscillosensor and its application in a biological information measurement system. This ultrasonic sensor has a cylindrical tank of 26 mm (diameter)20 mm (height) filled with water and an ultrasonic probe. It detects the vibration of the target object by obtaining echo signals reflected from the water surface. This sensor can noninvasively detect the vibration of a patient by placing it under a bed frame. We propose a recognition system for humans in bed. Using this sensor, we could determine whether or not a patient is in the bed. Moreover, we propose a heart rate monitoring system using this sensor. When our system was tested on four volunteers, we successfully detected a heart rate comparable to that in the case of using an electrocardiograph. Fuzzy logic plays a primary role in the recognition. Consequently, this system can noninvasively determine whether a patient is in the bed as well as their heart rate using a constraint-free and compact device.