SENSOR AND METHOD FOR DETECTING VERY LOW FREQUENCY ACOUSTIC SIGNALS

摘要

There is disclosed a sensor (100) and method for detecting very low frequency acoustic signals. The sensor (100) is capable of detecting low frequency acoustic signals in the frequency range of one tenth Hertz to thirty Hertz. The sensor (100) comprises a chamber (120) having portions that form a cavity (150) and a low frequency microphone (110) placed within the cavity (150). An alternate embodiment of the invention comprises a chamber (120) having portions that form a resonant cavity (440), a low frequency microphone (110) placed within the resonant cavity (440), and a membrane (430) that covers the resonant cavity (440). Low frequency acoustic signals that are incident on the membrane (430) cause the membrane (430) to move and amplify the acoustic signals within the resonant cavity (440).