Imaging Systems

Design and development of a high-performance passive millimeter-wave imager for aeronautical applications

[+] Author Affiliations
Alan H. Lettington

The University of Reading, Physics Department, Whiteknights, Reading RG6 6AF, United Kingdom

Dennis Dunn

The University of Reading, Physics Department, Whiteknights, Reading RG6 6AF, United Kingdom

Naomi E. Alexander

The University of Reading, Physics Department, Whiteknights, Reading RG6 6AF, United Kingdom

Anas Wabby

The University of Reading, Physics Department, Whiteknights, Reading RG6 6AF, United Kingdom

Brendan N. Lyons

Farran Technology Limited, Ballincollig, County Cork, Ireland

Rory Doyle

Farran Technology Limited, Ballincollig, County Cork, Ireland

John Walshe

Farran Technology Limited, Ballincollig, County Cork, Ireland

Magdy F. Attia

Johnson C. Smith University, Charlotte, North Carolina 28216

Isaiah Blankson

NASA Glenn Research Center, Cleveland, Ohio 44135

Opt. Eng. 44(9), 093202 (September 16, 2005). doi:10.1117/1.2050447
History: Received December 15, 2004; Revised March 03, 2005; Accepted March 12, 2005; Published September 16, 2005
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We describe a high performance optomechanically scanned millimeter-wave imager intended to monitor the ground movement of aircraft in adverse weather conditions. It employs two counter-rotating mirrors that are tilted about their axes of rotation. They simulate the linear scan of a single high speed, large aperture flapping mirror. When used with a linear receiver array, they can produce a 2-D scan of the scene at TV rates. In the present application, they were used with a single receiver and a large flapping mirror to produce a 2-D scan of the scene ±10deg vertically and 60deg horizontally. One of the rotating mirrors has a concave surface and acts as the focusing element in the imager. The two mirrors are driven from a single servo motor using timing belts and toothed pulleys. The flapping mirror is slaved to the motion of the rotating disks using an electronic cam. The single channel 94GHz receiver consisted of an InP LNA followed by a down converter and a detector. The video output passes to an A∕D converter and is displayed on a conventional PC. This system has virtually 100% transmission and can be used at any waveband.

Figures in this Article
© 2005 Society of Photo-Optical Instrumentation Engineers

Citation

Alan H. Lettington ; Dennis Dunn ; Naomi E. Alexander ; Anas Wabby ; Brendan N. Lyons, et al.
"Design and development of a high-performance passive millimeter-wave imager for aeronautical applications", Opt. Eng. 44(9), 093202 (September 16, 2005). ; http://dx.doi.org/10.1117/1.2050447


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