Linear position sensor using a coaxial resonant cavity
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United States of America Patent
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May 21, 1996
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N/A
app pub date -
Mar 14, 1995
filing date -
Dec 23, 1991
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Abstract
An apparatus (102) is adapted to detect the linear extension (position), velocity and acceleration of a hydraulic cylinder (108). The hydraulic cylinder (108) defines a variable length coaxial resonant cavity (112). Under the control of a controller (228), an RF transmitting section (114) and an RF receiving section (116) are used to determine the resonant frequency of the cavity. The resonant frequency of the cavity (112) is determined by comparing a received signal with a threshold and detecting slope intercept conditions.
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