Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1995-03-14
1996-02-13
Regan, Maura K.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
91361, 92 5R, G01R 2704, F15B 1316
Patent
active
054914221
ABSTRACT:
An apparatus (102) is for detecting 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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Bitar Ali A.
Bowman Charles W.
Morgan Denny E.
Caterpillar Inc.
Regan Maura K.
Yee James R.
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