Vanessa1402
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On stealth fighters, the IRST / FLIR system is often put inside a faceted box with sapphire window. The window has a tin/ metalic look from certain direction, apparently because it is coated with a thin gold layer to keep RF wave outside.
But how about normal black window on longwave IRST such as Pirate, IRST21? are they transparent to Radio wave?
![E593E71E-C778-48D8-ADC6-8C36DED4A281.jpeg E593E71E-C778-48D8-ADC6-8C36DED4A281.jpeg](https://www.secretprojects.co.uk/data/attachments/213/213284-cd1fb2f93e2ad6b0276b14af292c6c9a.jpg)
But how about normal black window on longwave IRST such as Pirate, IRST21? are they transparent to Radio wave?
![4C574A7A-80A3-41ED-8314-608F5F344017.jpeg 4C574A7A-80A3-41ED-8314-608F5F344017.jpeg](https://www.secretprojects.co.uk/data/attachments/213/213285-850c3c1eb7bb9b3baee7c7869f062c18.jpg)