Mechanical encoders could add unnecessary drag, and magnetic encoders are not perfectly linear, so optical encoders were used.

In addition to motors and controllers, a rotary encoder is the third essential module in the software and hardware for closed loop applications.

TT Electronics has launched FlexSense a technology designed to optimize optical encoder applications. The FlexSense series consists of the FS210 Transmissive Incremental Encoder and the FS310 ...

Avago Technologies has designed a range of 3-channel optical incremental encoder modules for controlling DC servo motors, but also robotics and drones.