学位論文

指向性マイクロホンを用いた圧力脈波計の評価と活用性

EVALUATION AND PRACTICAL USE NATURE OF THE PRESSURE PULSE WAVE METER USING A DIRECTIONAL MICROPHONE

jpn

2013-03-24

Not Applicable (or Unknown)

2013-03-24

修士(工学)

工学研究科システム工学専攻; 指導教授: 渡邊嘉二郎

This paper describes a novel sensor device, a pressure pulse wave meter, which uses a directional condenser microphone. Currently aging is becoming a serious social issue in Japan causing increased medical expenses in the country. It seems important for elderly citizens to check health condition at home, and to care the health conditions through daily monitoring. Given this circumstances, we developed a novel pressure pulse wave meter based on a directional condenser microphone: this device is used as a measuring instrument of health conditions of living bodies. A typical directional condenser microphone has a hole both on its front and back sides to determine its directional property. We closed both the holes to make separate spaces in terms of pressure. This architecture made it possible to improve the microphone’s lower frequency characteristics at more than 1 Hz, which is sufficient to measure pulse waves. The frequency characteristics of both the front and back side are improved. The experimental results showed the wave forms measured from the pressure pulse wave meter and those from pulse oximeter were quite similar; the correlation coefficient was 1.0. Furthermore, we confirmed the pressure pulse wave meter could not only measure a fingertip, but also could be applied to any other part of the body, and we measured many parts by use of the wave meter. And we could connect the wave meter with the blood pressure measurement.

Thesis