ACOUSTIC SENSOR AND ACOUSTIC SENSOR SYSTEM
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United States of America Patent
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Feb 8, 2017
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Sep 20, 2013
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Abstract
According to one embodiment, an acoustic sensor includes a base and a first strain sensing element. The base includes a support and a first film unit supported by the support. The first film unit is flexible. The first strain sensing element is provided on a first surface of the first film unit. The first strain sensing element includes a first magnetic layer, a second magnetic layer, and a first intermediate layer provided between the first magnetic layer and the second magnetic layer. An angle between a magnetization of the first magnetic layer and a magnetization of the second magnetic layer is variable by an acoustic wave. The acoustic wave is transmitted to a first film unit by a first transmitting material in contact with the first film unit.
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