I have a situation in which I need to use a thermal camera in a rain enviroment, the camera is mounted on a gymbal and can rotate 360 degrees, so I tought it may be an option to build a dome in order to separate it from the rain. I tested the absorption of a couple materials without much success. Glass, polycarbonate, and acrylic do not allow IR. I tried with some bags that I beleive may be made out of nylon with sucess, but this material may not be rigid enough to build a dome. What do you suggest? Perfect thermal values are not necesary in the proyect, I just need to be able to identify people.