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

G - Physics

01

B

G01B 7/14 (2006.01) F15B 15/28 (2006.01) G01D 5/12 (2006.01) G01D 5/48 (2006.01) G01P 3/66 (2006.01) G01P 15/16 (2006.01)

Patent

CA 2122603

2122603 9313388 PCTABS00024 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 lenght 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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