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Proceedings Paper

Millimeter-wave reflectometer
Author(s): Roger Appleby; Michelle Leeks-Musselwhite
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Paper Abstract

This paper describes a reflectometer, which can operate at either 35 or 94 GHz. A broadband signal is produced by a modulated noise source in either vertical or horizontal polarization. After reflection by the sample under test a super-heterodyne receiver detects this signal. The noise source and the receiver are mounted on two opposed 0.5 m parabolic antennas. These antennas are supported on arms, which can be rotated by stepper motors under computer control. The computer also controls the data logging system, which consists of a lock-in amplifier and analogue to digital converter. This instrument allows reflectivity to be measured for incidence angles from 20 to 70 degree(s) down to a minimum of 0.05%, which is sufficient to measure diffuse reflection.

Paper Details

Date Published: 29 July 2002
PDF: 7 pages
Proc. SPIE 4719, Infrared and Passive Millimeter-wave Imaging Systems: Design, Analysis, Modeling, and Testing, (29 July 2002); doi: 10.1117/12.477466
Show Author Affiliations
Roger Appleby, QinetiQ (United Kingdom)
Michelle Leeks-Musselwhite, RAF College Cranwell (United Kingdom)


Published in SPIE Proceedings Vol. 4719:
Infrared and Passive Millimeter-wave Imaging Systems: Design, Analysis, Modeling, and Testing
Roger Appleby; David A. Wikner; Roger Appleby; Gerald C. Holst; David A. Wikner, Editor(s)

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