| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a breath detector, a respiration determination system which can confirm safety of a sleeping person who seldom moves and a respiration determination method. <P>SOLUTION: The respiration determination system 10 has a pair of ultrasonic transmitters/receivers 11 and 11 connected to a signal processing apparatus 20. The pair of ultrasonic transmitters/receivers are arranged opposingly interposing a breath region wherein the temperature rises temporarily by breath when a sleeping person breathes. The signal processing apparatus 20 makes the pair of ultrasonic transmitters/receivers 11 and 11 to transmit or receive ultrasonic wave to or from each other at a predetermined cycle and measures ultrasonic arrival time between the ultrasonic transmitters/receivers 11 and 11. The breath of the sleeping person is detected on the basis of the changes of the ultrasonic arrival times. <P>COPYRIGHT: (C)2010,JPO&INPIT |
