Contactless encoder is used at higher angular velocities and for objects lacking integral supporting shaft.
Electronic shaft-angle encoder
NASA Tech Briefs ; 2 , 4
1977-03-01
Miscellaneous
No indication
English
IEEE | 1966
|Capacitive shaft-angle encoder
NTRS | 1977
|Optical Shaft-Angle Encoder For Helicopter Rotor
NTRS | 1993
|