Looking for thin sensor for silicon wafer presence

[JubilationTCornpone]

Hello, all. I'm looking for a very thin sensor that I can use for detecting silicon wafers. It is to be used in a robotic end-effector for the semiconductor industry.

I had previously planned on using a thin capacitive sensor which was to be offered by a certain vendor. Since then, I've been told that this sensor might not be offered after all, so I need to start looking for alternatives.

Help?

 

[bobalou]

We use Keyence.