Mechanically scanned real-time passive millimeter-wave imaging at 94 GHz

Roger Appleby; Rupert N. Anderton; Sean Price; Neil Anthony Salmon; Gordon N. Sinclair; Peter R. Coward; Andrew R. Barnes; P. D. Munday; M. Moore; Alan H. Lettington; Duncan A. Robertson

doi:10.1117/12.488003

20 August 2003 Mechanically scanned real-time passive millimeter-wave imaging at 94 GHz

Roger Appleby, Rupert N. Anderton, Sean Price, Neil Anthony Salmon, Gordon N. Sinclair, Peter R. Coward, Andrew R. Barnes, P. D. Munday, M. Moore, Alan H. Lettington, Duncan A. Robertson

Author Affiliations +

Proceedings Volume 5077, Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII; (2003) https://doi.org/10.1117/12.488003
Event: AeroSense 2003, 2003, Orlando, Florida, United States

Abstract

It is well known that millimetre wave systems can penetrate poor weather and battlefield obscurants far better than infrared or visible systems. Thermal imaging in this band offers the opportunity for passive surveillance and navigation, allowing military operations in poor weather. We have previously reported a novel real time mechanically scanned passive millimetre wave imager operating at 35GHz and in this paper a 94GHz variant will be described. This 94GHz imager has a field-of-view of 60° x 30° and has diffraction limited performance over the central two thirds of this field-of-view. It is relatively inexpensive because the scene is imaged using a linear array of direct detection receivers and compact folded optics. The receiver array has been constructed using indium phosphide monolithic microwave integrated circuits (MMICs) allowing high gain and low noise figure to be achieved. The compact optics consist of a polarisation sensitive mirror and a Faraday rotator. readily The mirror is constructed from expanded polystyrene, supporting a printed copper grid etched onto a PTFE/glass fibre substrate. These materials are low cost and readily available. The Faraday rotator is made from a commercial grade plasto-ferrite sandwiched between antireflection coatings. The optics produce a conical scan pattern and image processing is used to generate a raster scan pattern and to perform gain and offset corrections.

Citation Download Citation

Roger Appleby, Rupert N. Anderton, Sean Price, Neil Anthony Salmon, Gordon N. Sinclair, Peter R. Coward, Andrew R. Barnes, P. D. Munday, M. Moore, Alan H. Lettington, and Duncan A. Robertson "Mechanically scanned real-time passive millimeter-wave imaging at 94 GHz", Proc. SPIE 5077, Passive Millimeter-Wave Imaging Technology VI and Radar Sensor Technology VII, (20 August 2003); https://doi.org/10.1117/12.488003

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available