20 July 2000 Optomechanical scanners for passive millimeter-wave imaging
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Abstract
This paper describes the design and development of a novel reflective lens for use at millimeter and microwave frequencies. This lens uses twist-polarization techniques and effectively simulates a refractive lens of index 3 in a cheap, light-weight structure consisting of two wire grid polarizers and a Faraday rotator. This paper also discusses how a high-sped rotary scanning mechanism can be used to produce a linear scan pattern again using twist-polarization techniques. This linear scanner employs a wire grid polarizer in the form of a roof prism, a Faraday rotator or quarter wave plate and a rotating disc inclined with respect to its axis of rotation. Through multiple reflections the original conical scan is cancelled in one direction while it is doubled in the other direction to form a linear scan pattern.
© (2000) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Alan H. Lettington, Vicky Paraskevi Papakosta, D. Dunn, "Optomechanical scanners for passive millimeter-wave imaging", Proc. SPIE 4032, Passive Millimeter-Wave Imaging Technology IV, (20 July 2000); doi: 10.1117/12.391822; https://doi.org/10.1117/12.391822
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