| 摘要 |
<p>A body function sensor (1, 2, 3) for detecting breathing or heart beat or the like has an RF source (5) driving a transmit antenna (20) to create a low frequency (LF) electromagnetic detection field at a location to be occupied by an animal body. A receive antenna (21) is arranged to drive an analyser means (23, 13, 15,) to produce a signal representing the difference between the transmitted and detected signals detect a change in the field caused by the breathing or heart beat of an animal body in the location. A control means (16) controls the frequency of the RF source (5) to ensure resonance, and also controls the analyser means (23, 13), a display monitor (17) and an alarm. A memory (18) records movements of the subject, breathing patterns, pulse rate and posture of the body.</p> |
