It is shown that selective extraction of an image from multiple interferograms can be performed by electronic processing of interference beat signals. The frequencies of beat signals generated by ramping the laser-diode (LD) current are proportional to the optical path differences between the reference and the object arms in a LD interferometer. A beat signal with a frequency corresponding to an object-assigned interferometric arm can be extracted by electronic tuning. An interference pattern detected by a dissector camera is sampled in synchronism with the beat signal, which permits two-dimensional selective imaging.
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