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This paper describes an imaging sensor system that uses a composite ultrasonic array. Side lobes and grating lobes in sensor directivity appear in conventional ultrasonic arrays. However, these lobes are reduced in this new sensor system. The sensor system consists of four wide-area ultrasonic array units, which are each made up of eight small-area ultrasonic receivers. After applying delay-and-sum...
This paper describes an imaging sensor system that uses rectified delay-and-multiply operations with an ultrasonic array. Delay-and-sum operations are generally used for synthetic aperture systems; however, greatly improved directivity spectra can be obtained using the new system. The side lobe in the sensor directivity is very small, and it is easy to determine the threshold level of the signal....
Imaging sensor system using dispersed ultrasonic array is described in this paper. Although ultrasonic elements are generally mounted on a plane or curved surface with separation shorter than half the wavelength of the ultrasonic wave for synthetic aperture systems, the elements can be distributed on any position and wide separations are acceptable for our system. Although delay-and-sum operations...
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