Before revision: The first commercially available passive millimeter wave camera for use in aircraft was created by Vū URL and launched at the National Business Aviation Association (NBAA) Conference in October URL Short range passive millimeter wave scanners are in use today for airport URL and many scientific research URL URL Operation of a passive millimetre wave camera is based on measuring the difference or contrast in temperatures, but at millimetre wave frequencies, anywhere from 30 GHz to 300GHz URL Imaging radar An imaging radar has also been proposed by NASA in the 1990s.The 94 GHz MMW imaging radar system, Proceedings of the Workshop on Augmented Visual Display (AVID) Research; p 47–60 (December 1993) It can offer the same scene resolution as a PMMW, but has different properties.
After revision: The first commercially available passive millimeter wave camera for use in aircraft was created by Vū URL and launched at the National Business Aviation Association (NBAA) Conference in October URL Short range passive millimeter wave scanners are in use today for airport URL and many scientific research URL URL Operation of a passive millimeter wave camera is based on measuring the difference or contrast in temperatures, but at millimeter wave frequencies, anywhere from 30 GHz to 300GHz URL Imaging radar An imaging radar has also been proposed by NASA in the 1990s.The 94 GHz MMW imaging radar system, Proceedings of the Workshop on Augmented Visual Display (AVID) Research; p 47–60 (December 1993) It can offer the same scene resolution as a PMMW, but has different properties.