Abstract
A real-time ultrasonic phase conjugator is reported. The scheme is based on sampling the wave front in space by means of a transducer array and mixing the signal from each array element with a second harmonic signal using nonlinear circuit components. The same array then retransmits the phase conjugated wave front into the medium. The technique is demonstrated at 300 kHz using a 20-element transducer array, and it is shown that efficient phase conjugation is possible up to spatial frequencies of ±80°.
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