PURPOSE: To obtain uniform vibrator characteristics by correcting the variation of transmitting and receiving sensitivity of an individual ultrasonic vibrator.
CONSTITUTION: A channel selector 7 selects one of the signals given by vibrators 11W1n according to the signal given by a computer 6, and applies the selected signal to an A/D converter 9 via a pre-amplifier 8. A digital waveform from the A/D converter 9 is inputted, based on the signal given by the computer, to a digital amplifier 11 capable of controlling the amplification and attenuation of the digital waveform, an added to a digital adder 12. Next the added digital ultrasonic waveform is applied to an image indicator 14 through a signal processor 13. For the individual vibrator, its direction of a deflected angle against the main beam direction and acoustic pressure level are recorded using the standard test piece and then stored in the computer 6 beforehand so that the signal received is corrected by the digital amplifier 11.
NAGAI SATOSHI
FURUMURA ICHIROU
