JPS55107382A - Ultrasonic wave pickup system - Google Patents

Abstract

PURPOSE:To enable to obtain the picture high in resolution, in any part of observation depth, by changing the number of apertures and the focal length of the transmission and reception means depending on the section toward the depth of observing area, at the ultrasonic pulse transmisson. CONSTITUTION:The sound field of the pickup objective is split into a plurality toward the depth of ultrasonic beam. Further, each sound field is split into a plurality of sections. First, the control circuit 90 sets the number of apertures, focal length and Q of the tuning circuit corresponding to the first section of the first line to the linear oscillation array 10, delay lines 40, 50 and transmission and reception circuits 21-24 and ultrasonic beam is radiated from the array 10. Next, the echo returned is detected at the array 10, this detection signal is received at the circuits 21-24, focussing is made on the line 50 and stored in the picture memory 70. Next, the circuit 90 sequentially controls the radiation of the ultrasonic beam to the sections on and after the next section and stores the echo signal of the all sections on the first line to the memory 70. Similarly scanning of each line is made and the echo image is stored over the entire area for the memory 70.