Translator Disclaimer
8 December 2004 The design of a real-time 94-GHz passive millimetre-wave imager for helicopter operations
Author Affiliations +
It is well known that millimetre wave systems can penetrate poor weather and battlefield obscurants far better than infrared or visible systems. Imaging in this band offers the opportunity for passive surveillance and navigation allowing military operations in poor weather. We have previously reported a novel prototype real time mechanically scanned passive millimetre wave imager operating at 94GHz. This 94GHz imager has diffraction limited performance over the central two thirds of the 30 x 60 degrees field of view with and a 25Hz frame update rate. This paper reports the redesign of the prototype to operate in a helicopter environment. The vibration resulting from the helicopter rotors can typically range up to 3g peak at specific frequencies and is the major challenge for imaging systems. The mechanical design of the new imager is based on a rigid space frame utilising expanded polystyrene as a structural element to support the receiver array. The optical design of the imager has also been toleranced so that the impact of vibration on image quality is minimised. The use of novel design techniques and materials support a development path to a low cost low mass production unit.
© (2004) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roger Appleby, Rupert N. Anderton, Neil H. Thomson, and James W. Jack "The design of a real-time 94-GHz passive millimetre-wave imager for helicopter operations", Proc. SPIE 5619, Passive Millimetre-Wave and Terahertz Imaging and Technology, (8 December 2004);


Use it or lose it
Proceedings of SPIE (November 13 2014)
Specification Of Scan Lenses
Proceedings of SPIE (July 14 1986)
An Improved Meteorological Satellite
Proceedings of SPIE (February 23 1985)
Security scanning at 94GHz
Proceedings of SPIE (May 19 2006)

Back to Top