Re: New 30THz video


Glyn M0XGT
 

 
They’re using something like a Melexis MLX90614 thermopile detector in the long infra-red, a bit like the sort of thing you get in passive IR door openers and alarms, etc., and because the IR window is 5 to 14 um, where atmospheric absorption is low, it corresponds to at radio around 30 to 40 THz. 
 
It looks like fun, but it's just sending wideband thermal noise from an uncorrelated heat source, or sun heliograph, and detecting ON/OFF keying in the thermopile to claim 30 THz distance world records. But using a FLIR IR camera attachment on an iphone would likely work much better and also over a much longer distance. 
 
Gly M0XGT
 
 

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