| Autor: |
K. Kondo, K. Taniguchi, Toshiyuki Sawayama, Syoji Kobashi, Yuya Kamozaki, Yutaka Hata |
| Rok vydání: |
2006 |
| Předmět: |
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| Zdroj: |
IEEE Ultrasonics Symposium, 2005.. |
| DOI: |
10.1109/ultsym.2005.1603215 |
| Popis: |
The vibration of human vital activity has usually 10Hz or less. The sensor that effectively detects this vibration is required in the field of medicine and nursing. In this paper, we propose an extraction system of sleep state using a new ultrasonic oscillosensor. This sensor has 30dB S/N in the resonance frequency and the size of 26mm diameter × 10mm height, and it has a linear characteristic in a band being lower than the resonance frequency. The resonance frequency of this sensor is 6.8Hz for longitudinal and transverse vibrations. Thus, this sensor effectively detects low-frequency vibrations. We propose a system that detects the sleep state by using this sensor. In the experimental results, we extracted the number of flop-over at the 13% of mean error ratio and extracted the sleeping time at 3.5% of mean error ratio for the healthy volunteers. For the two patients: one is insomniac and the other is not so, we were able to extract the difference between the patients. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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