Ultrasonic imaging system which uses a rotating M-sequence phase disk and correlation analysis

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Abstract
A new ultrasonic imaging system is proposed which uses transformation of the two-dimensional spatial distribution of the wave field of a coherently illuminated object into a temporally coded scattered wave field, by rotating an M-sequence phase disk just behind the object. It is shown that a two-dimensional image of the object can be obtained by cross-correlation analysis of the signal detected by a stationary-point receiver in the farfield with the same M-sequence signal generated in a signal processor. Construction of such a system is described together with some experimental results. Typically, a 1-MHz ultrasonic wave is used and an image of the object in a 40×70-mm region is obtained in 15 s.

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