science

They scattered infrared light in a weird way.

I was actually installing a system with passive IR motion sensors that worked great at night, but as soon a as the sun was shining in, went all haywire. We brought them down the hall to the older tinted window wing, and they behaved normally again. They even worked well outside, which we thought was the worst case scenario during testing.

When we came back with an ir camera, it was full of scattered noise, but the resolution wasn’t good enough to understand exactly what was happening and we had already switched to different hardware that worked around the problem.