Here's a $55 pyrex lens that you can measure temperature through with a thermal IR sensor:
http://www.bhphotovideo.com/c/product/471622-REG/Surefire_Z46_Z46_Bezel_Assembly_Replacement_.html
The above picture shows what range pyrex is transparent in, from this site:
http://www.pgo-online.com/intl/katalog/curves/pyrex_kurve.html
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