Technology of hydraulic cylinder position feedback.
Isn't that an angle sensor?
Not quite, or at least not directly. Probably Rudder VDT.
Now what is a VDT? See this link for a clue
Modern LVDTs in New Applications in the Air, Ground, and Sea | Sensors
We'll let A33Zab grade this exercise.
(And the winner is Lyman, it seems!)
Last edited by Machinbird; 23rd Mar 2012 at 01:25.
Reason: acknowledging a winning answer.