Terahertz sensor from TeTechS has a selectable operation frequency

The Vega 800 compact terahertz sensor system is based on terahertz photoconductive antenna technology.

Laser Focus World Editors
Sep 29th, 2015
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The Vega 800 compact terahertz sensor system is based on terahertz photoconductive antenna technology. This single-frequency portable system can test solids, powders, polymers, films, and liquid samples. It has a selectable operation frequency and moveable fiber-couple transmitter and receiver heads with a pre-set, collimated beam between them.
TeTechS
Waterloo, ON, Canada
http://tetechs.com

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