Abstract
Abstract An implementation of a real-time Fourier (chirp) transform processor using ultrasonic strip dispersive delay lines is presented. The basic Fourier transformation properties of a linear dispersive delay line (chirp filter) are first described. and limitations imposed by the finite time and bandwidth of the device are pointed out. Utilizing ultrasonic delay lines with a time—bandwidth product of 80 as the dispersive elements, a processing system consisting of a forward transformer, a gating circuit and an inverse transformer has been constructed. The system, which is simple and easy to build, offers much finer frequency resolution than those employing surface-acoustic-wave devices. Experimental results demonstrate the processing capability of the system and confirm the feasibility of the approach. The method of implementation is most appropriate for processing applications in the low-frequency range.
Published Version
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