SICK (UK) LTD

The DBV50 Core measuring wheel encoder is a measuring wheel system for measuring linear movements. It consists of the DBS50 Core incremental encoder, an aluminum measuring wheel with a 200 mm diameter and a spring-loaded arm. The maximum resolution is 0.08 mm per pulse.
The spring arm has a maximum spring travel of 14 mm, a maximum spring force of 20 N and features a convenient pretension setting for repeatably setting the spring pretension. A spring travel limiter protects the spring from being overloaded.
The encoder can be rotated and mounted on both sides of the spring arm, routing of the cable can be adapted to the application. The measuring wheel system can be delivered with numerous electrical interfaces, facilities for connecting and resolutions.
www.sick.com/D...

[@padiyar]

I am looking at a high quality, less weight, standalone rotary optical encoder for a wheeled robot, I don't want to use an umbilical encoder cord connecting the encoder and hardware, Can someone point towards such a product?