Publications [#280145] of David J. Brady

Papers Published

1. Hunt, J; Gollub, J; Driscoll, T; Lipworth, G; Mrozack, A; Reynolds, MS; Brady, DJ; Smith, DR, Metamaterial microwave holographic imaging system., Journal of the Optical Society of America A, vol. 31 no. 10 (October, 2014), pp. 2109-2119, ISSN 1084-7529
   (last updated on 2023/06/01)

   Abstract:
   We demonstrate a microwave imaging system that combines advances in metamaterial aperture design with emerging computational imaging techniques. The flexibility inherent to guided-wave, complementary metamaterials enables the design of a planar antenna that illuminates a scene with dramatically varying radiation patterns as a function of frequency. As frequency is swept over the K-band (17.5-26.5 GHz), a sequence of pseudorandom radiation patterns interrogates a scene. Measurements of the return signal versus frequency are then acquired and the scene is reconstructed using computational imaging methods. The low-cost, frequency-diverse static aperture allows three-dimensional images to be formed without mechanical scanning or dynamic beam-forming elements. The metamaterial aperture is complementary to a variety of computational imaging schemes, and can be used in conjunction with other sensors to form a multifunctional imaging platform. We illustrate the potential of multisensor fusion by integrating an infrared structured-light and optical image sensor to accelerate the microwave scene reconstruction and to provide a simultaneous visualization of the scene.