| 摘要 |
AN ULTRASONIC SIGNAL PROCESSING METHOD FOR IMPROVING THE SIGNAL-TO-NOISE RATIO IN ULTRASONIC MEASUREMENTS COMPRISES THE TRANSMISSION OF A PREDEFINED TIMED SEQUENCE OF A NUMBER OF ULTRASONIC BURST SIGNALS AT A FIRST TRANSDUCER, AND RECEPTION OF A SIGNAL REPRESENTING SAID TRANSMITTED SEQUENCE OF ULTRASONIC BURST SIGNALS AT A SECOND TRANSDUCER. THIS SIGNAL IS PROCESSED BY ADDITION OF MULTIPLE TIME-SHIFTED COPIES OF THE RECEIVED SIGNAL TO SAID ORIGINAL RECEIVED SIGNAL TO OBTAIN A SUM OF THE ORIGINAL RECEIVED SIGNAL AND ITS TIME-SHIFTED COPIES. AN ORIGINAL BURST SIGNAL HAVING AN IMPROVED SIGNAL-TO-NOISE RATIO IS RECONSTRUCTED FROM THIS SUM.
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