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Hadamard speckle reduction for millimeter wave imaging

✍ Scribed by Irina Jaeger; Johan Stiens; Gaetan Koers; Gert Poesen; Roger Vounckx

Book ID
102518518
Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
438 KB
Volume
48
Category
Article
ISSN
0895-2477

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✦ Synopsis

Abstract

Millimeter wave imaging technology makes possible imaging of phenomena, which are inaccessible to visible light, but suffer from speckles, produced by coherent sources. We report a 50% speckle reduction, measured with a free‐space vector network analyzer over the full W‐band. Our experiments demonstrate how Hadamard mask operates as a tunable filter. Β© 2006 Wiley Periodicals, Inc. Microwave Opt Technol Lett 48: 1722–1725, 2006; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.21747

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## Abstract We present the design, construction and testing of dynamic 2 Γ— 2 Hadamard diffuser used to reduce speckle, produced by coherent millimeter‐wave sources in active imaging. The 1's and βˆ’1's binary entities of the Hadamard matrix constitute the inputs for the construction of sets of orthog