Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1989-12-04
1990-08-28
Crosland, Donnie L.
Communications: electrical
Condition responsive indicating system
Specific condition
324633, 324635, 324642, 333 34, 333 24C, 333115, 91361, 92 5R, G08B 2100, G01N 2200
Patent
active
049529161
ABSTRACT:
An electrohydraulic control system includes an actuator having a cylinder and a piston variably positionable therewithin. An electrohydraulic valve is responsive to valve control signals for coupling the actuator to a source of hydraulic fluid. A coaxial transmission line extends through the actuator, and includes an outer conductor formed by the actuator cylinder and a center conductor operatively coupled to the piston such that length of the coaxial transmission line is effectively directly determined by position of the piston within the cylinder. An rf generator is coupled by an antenna to the coaxial transmission line for launching rf energy therewithin, and valve control electronics is responsive to rf energy reflected by the coaxial transmission line for indicating position of the piston within the cylinder and generating electronic control signals to the valve. The antenna includes a pad positioned radially adjacent to but spaced from the center conductor of the transmission line, an rf connector axially spaced from the pad, and an exponentially tapering transmission line that extends axially and radially from the pad to the connector. The dimensions of the tapering transmission line are tailored to match characteristic impedance of the coaxial transmission line to that of the electronics at the rf connector.
REFERENCES:
patent: 3390356 (1968-06-01), Ryals et al.
patent: 4588953 (1986-05-01), Krage
patent: 4737705 (1988-04-01), Bitai et al.
patent: 4749936 (1988-06-01), Taplin
patent: 4757745 (1988-07-01), Taplin
Crosland Donnie L.
Vickers Incorporated
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