| 摘要 |
<p>Noises made by the flow of blood in the human cardiovascular system, respiratory and skeletal noises made in the joints of a skeletal animal provide a wide variety of sounds which, when the human body is partially or completely immersed in a body of acoustically transmissive liquid, are directly coupled to the acoustically transmissive liquid and thus launched into the acoustically transmissive liquid. The cardiovascular system has a unique acoustic signature. Joints, for example, which are injured or diseased have unique acoustic signatures e.g., sounds they make, which are launched into the water and thus each individual's skeletal system makes or produces a unique pattern of noise or sounds which are normally inaudible, but when immersed in a body of water can be detected by hydrophones or underwater microphones. The invention has use in locating missing or lost divers, surveillance of bodies of water for surreptitious entry thereto for safe-guarding swimming pools, etc.</p> |
