Using doppler techniques to measure non-uniform rotation of an ultrasound transducer
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Jun 19, 1998
filing date -
Jun 19, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
According to one embodiment, an apparatus for measuring rotational velocity includes a support member, a transducer, and a Doppler shift measurement module. The transducer, which is supported by the support member, emits a first wave and detects a corresponding second wave reflected by matter intercepted thereby as the support member rotates continuously about an axis of rotation. The Doppler shift measurement module measures frequency shifting between the first wave and the second wave as the support member rotates about the axis of rotation, the frequency shifting being indicative of a rotational velocity of the support member relative to the matter. According to another embodiment, a method for analyzing motion of a transducer, includes the steps of: (a) emitting a wave from the transducer while a support member supporting the transducer is rotating; (b) detecting a portion of the wave that is reflected from matter intercepted thereby; and (c) measuring frequency shifting between a frequency of the wave and a frequency spectrum of the reflected portion of the wave.
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