An instantaneous echography by ultrasonic fan beam

A new ultrasonic imaging method to obtain an instantaneous echogram is described. This method is developed to detect the object image without scanning by a pulsed fan beam. The experiments are made on copper wires, a vinyl sheet and a sponge in a water vessel. The results show that spot objects can be detected by this method and that projecting multipulse at high frequency and lengthening aperture are effective to improve the image of a plane object and a voluminous object.