Discussion
What is aperture holography used for?
Answer: B
Transforming a measured far field pattern back to the aperture plane recovers the phase distribution across the reflector, and departures from a plane wave map directly onto surface errors. Panels can then be adjusted by the amounts the map shows. It is the standard method for setting large radio telescope surfaces. Documentation imaging, polarisation measurement and impedance testing are unrelated tasks. The technique is a neat example of the aperture to far field transform being used in the reverse direction.
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