Need Ideas. video linked below 3mb type mp4.
http://www.angelfire.com/scifi2/zpt/temp/PlasticCir.mp4 Conditon #1 Two opposed circular polarizers block the light. Condition #2 #1 PET plastic between the polarizers lets in the light. The effect is dramatic and easily detectable. Condtion #3 Other plastics #2, and #7 block the light. #3 #4 are not bottles. We do not want colored plastic. Condition #4 #5 Plastic lets the light through in colors. The intensity is a little lower than #1. This intensity effect or the light scattering is not robust enough to separate dirty, crushed bottles. Condition #5 #1 plastic behind the the #5 plastic within the detector kills the colors. What is going on? I believe that the #5 is rotating the axis of polarization and that the #1 is randomizing the polarization. I have found no way to separate these conditions. I tried liner polarizers and circular polarizers in both conditions of rotation. The effect is always the same. Frank Z http://www.angelfire.com/scifi2/zpt/temp/PlasticCir.mp4
