Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Distributive type parameters
Patent
1992-05-11
1994-06-28
Strecker, Gerard R.
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Distributive type parameters
324633, 324635, 91361, 92 5R, 73119A, G01R 2726, G01R 2704, F15B 1316, G01B 714
Patent
active
053250630
ABSTRACT:
An apparatus is adapted to detect the linear extension, velocity and acceleration of a hydraulic cylinder. The hydraulic cylinder defines a variable length coaxial resonant cavity Under the control of a controller, an RF transmitting section and an RF receiving section are used to determine the resonant frequency of the cavity. The receiving section includes a comparator circuit for increasing the sensor's sensitivity and eliminating spurious detections of the cylinder's resonant frequency. The linear extension of the cylinder is determined as a function of the resonant frequency.
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Caterpillar Inc.
Do Diep
Strecker Gerard R.
Yee James R.
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