Patent ID: 7066894
Filing Date: 2006-06-27
Classification: A61B

Abstract:
1. A sensor capable of detecting very low frequency acoustic signals, said sensor capable of being acoustically coupled to a source of acoustic signals, and said sensor capable of receiving low frequency acoustic signals in the frequency range of one tenth Hertz to thirty Hertz and generating electronic signals indicative of the intensity of said low frequency acoustic signals, said sensor comprising: a chamber capable of being acoustically coupled to a source of acoustic signals, said chamber having portions that define a resonant cavity within said chamber, said resonant cavity capable of amplifying the intensity of low frequency acoustic signals in the range of one tenth Hertz to thirty Hertz by resonating said low frequency acoustic signals within said resonant cavity; and a microphone within said resonant cavity, said microphone capable of receiving said amplified low frequency acoustic signals and capable of generating electronic signals indicative of the intensity of said amplified low frequency acoustic signals.