Ignorant question:
If you rotate a ball, which property allows you to "view" an actual rotation? There must be an uneven surface, marks or whatever. If you intend to use a particular sensor principle, it must be able to recognize these unique surface features and measure their displacement quantitatively.
Give us more information : Must it be a non-contact measurement? Are there unique optical features on the ball? Draw us a diagram
Maybe it is an option to approach it from the mechanical side by adding at the bottom another shaft signalling to the outside the position. Then theire are many options to pick-up the position outside the 300° environment. An ultrasound approach from outside (with a transimitter and a sensor opposite) and a DSP-analysis might give acceptable results as well. An important question is if the position needs to be identified permanently (e.g feedback to a process controller) or if it just for repair purpose? Also what is the outside temperature on the surface?
Enjoy your design work!
Use simple angular potentiometer sensor(variable resistor) and connect the POT shaft & Valve extension using thermal isolation material(EX: backlit plastic, wood, etc... )
Regards
Udhay
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