I am trying to build a protective enclosure for Microsoft's Kinect v2, which emits (and perceives) IR in the 827–850 nm range. In order to fully enclose the device without blocking those signals, I need some transparent and hard material that will let infrared pass through.
I have tried acrylic, glass and crystal from the local glass cutter, but I can't get good results from any of those materials.
The best result I got was when I stuck the pane flush to the Kinect's front, otherwise the IR camera just can't see anything. However, technically I can't do that because I need to allow the Kinect to tilt, and I can't have the pane always flush to the Kinect.
The enclosure will be completely opaque apart from the front pane (which is what I'm looking the material for).