Detecting a clear window in an envelope body with WLL180T

Dear all,

today I will show you an application, how to detect a clear window and the white envelope body at the “same” time, that means with one high signal. It is only possible to detect from top, through beam is not possible.

The solution could be the WLL180T-P434 #6039095 and LL3-DR09.
The fiber should be mounted 90° to the envelope to get direct reflex from the clear window and in a distance of approx. 50mm.
As teach I use the one point teach without object. So you get an high signal if the white paper is in the front or the clear window and you get a low signal if the clear window is missing.

Experimental Setup:
               
       

If you have any questions or other solutions, please do not hesitate to leave a comment.