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Imaging by microwave holography through aberrating media

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3 Author(s)
G. Papi ; Istituto di Ricerca sulle Onde Elettromagnetiche, C.N.R., Florence, Italy ; V. Russo ; S. Sottini

Imaging through random aberrating media can be of interest not only in optics but also in microwaves or in acoustics. However, the holographic techniques applied in optics cannot be readily extended to microwaves without essential modifications. A different holographic method is here proposed which seems convenient at microwaves. The image is obtained by the product of the aberrated hologram with another compensating for the aberration. In the experiments two different procedures have been followed to perform the product of the two holograms, the optical and the electronic multiplication. The results obtained with the two procedures are shown, one of which allows the correction of time variant aberrations. With this technique there is no limitation in the off-set angles of the reference waves that could be also obtained by locally produced signals and no coherence is requested between the object and the compensating wave. The technique could be of interest, for instance, in plasma diagnostic and geophysical problems.

Published in:

IEEE Transactions on Antennas and Propagation  (Volume:24 ,  Issue: 6 )