Linear position sensor using a coaxial resonant cavity

Details Linear position sensor using a coaxial resonant cavity Linear position sensor using a coaxial resonant cavity

1995-03-14

1996-05-21

Regan, Maura K.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Distributive type parameters

91361, 92 5R, G01R 2704

Patent

active

055193269

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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