Abstract

Earlier works on investigating the imaging of rf moving phase gratinglike objects was more or less based on geometric optics, and the Doppler effects of moving objects were apparently ignored. Therefore the results were not satisfactory. A temporal and spatial correlation theory for imaging of rf moving phase gratinglike objects has been developed. A series of filtering techniques based on analysis of phases, amplitudes, and the temporal and spatial spectra has been established, and the highest visibility of image for rf moving phase objects has been obtained in experiments. The new theory and technique are useful for optical and acoustooptic (AO) signal processing. As a particular application, the ultrasonic progressing wavefront at the near field of an AO device has been visualized; it has two transducers either in or out of phase. It can be used to explain whether the beam steering theory for AO devices at the near field is correct.

© 1991 Optical Society of America