Quote Originally Posted by Acetronics View Post
Halas !!!

when saturated ... your detectors won't "see" anything ... both of them !!!

no differential signal nor ...

Alain
I am thinking along the lines of both detectors being saturated but spaced maybe a centimeter or so apart. When the piece being detected cast a shadow on one and not the other then the differential. I guess it would only work if the light source was coming from one direction only........Darn, now I am back to square one