浴室内監視システムにおける水位計測 Measurement of Water Level in a Monitoring System of a Bathroom
Developing the monitoring system in a bathroom is important to prevent accidents in there. As a monitoring device, CCD camera is easily imagined. But this device is unsuitable by various problems such as violating one’s privacy and moistures on the lens, and so on. This paper proposes a new idea of immersing a pipe, which an acoustic sensor is set inside, in the water. By this procedure, we can obtain not only a direct sound information from the people in the bathroom but also the water level information. That is, stationary waves depending on the water level will be formed inside the pipe and the frequency analysis of the stationary waves enables the real time measurement of the level.<br>The proposed measurement system adaptively selects the data window, under which the accurate measurement is automatically achieved, by applying the criterion of Fisher’s information matrix. The experiments will demonstrate the accurate water level measurement by the proposed system regardless of the sound amplitude and type.
- 電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society
電気学会論文誌. C, 電子・情報・システム部門誌 = The transactions of the Institute of Electrical Engineers of Japan. C, A publication of Electronics, Information and System Society 124(7), 1462-1470, 2004-07-01