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Artificial Life and Robotics

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01-12-2015 | Original Article

Development of vibration sensing system with wide dynamic range: monitoring of scratching and turning-over motions during sleep

Authors: Yosuke Kurihara, Takashi Kaburagi, Kajiro Watanabe, Hiroshi Tanaka

Published in: Artificial Life and Robotics | Issue 4/2015

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Abstract

This paper describes a novel vibration sensing system with wide dynamic range for measuring “scratching”, “turning over” and “sitting up/lying down” motions in an unconstrained manner while the patient is sleeping. The sensing device used in the proposed system is composed of a piezoceramic sensor sandwiched between two metal plates. Under the system’s configuration, each piezoceramic sensor generates a measurable output voltage proportional to the wide-ranging amplitude of vibrations produced by “scratching”, “turning over” and “sitting up/lying down” motions. Furthermore, in order to detect the direction of “turning over” and “sitting up/lying down” motions, we defined two indices that could be calculated based on three output signals from the piezoceramic sensors placed under three legs of the bed. A validity experiment was carried out for comparison with a conventional sensing method for measuring “scratching”, “turning over” and “sitting up/lying down” motions. The results showed that the proposed vibration sensing system is valid in terms of accuracy without the need for attaching sensors to the patient’s body.

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Title: Development of vibration sensing system with wide dynamic range: monitoring of scratching and turning-over motions during sleep
Authors: Yosuke Kurihara
Takashi Kaburagi
Kajiro Watanabe
Hiroshi Tanaka
Publication date: 01-12-2015
Publisher: Springer Japan
Published in: Artificial Life and Robotics / Issue 4/2015
Print ISSN: 1433-5298
Electronic ISSN: 1614-7456
DOI: https://doi.org/10.1007/s10015-015-0241-x

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