Dual-frequency vibration sensor
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United States of America Patent
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Jul 5, 1994
Grant Date -
N/A
app pub date -
Feb 7, 1992
filing date -
Feb 13, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A vibration sensor is secured to an object whose vibrations are to be sensed, and includes a vibration plate capable of resonating at one of first resonance frequencies within a specific high frequency region of the frequencies at which the object can vibrate. A vibration element capable of resonating at one of second resonance frequencies within a specific low frequency region of the frequencies at which the object can vibrate is connected to the vibration plate so that the vibration resulting from the resonance of the vibration element is transmitted to the vibration plate. Further, a piezoelectric transducer element is fixed to the vibration plate, and is able to generate an electric signal in response to the stress applied by the vibration plate when this plate vibrates. Thus, it is possible, with a single sensor, to sense both vibrations composed of relatively high frequency components and vibrations composed of relatively low frequency components.
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