A new Golay code system for ultrasonic pulse echo measurements

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Abstract
Many measurements involving ultrasonic pulse echo techniques are limited by poor signal-to-noise ratios. It is well known that random or pseudorandom codes in conjunction with cross correlation can enhance signal-to-noise ratio and it has been shown that a form of pseudo-random sequence known as a Golay code enables the signal-to-noise ratio improvement to be obtained whilst requiring only two sequences of the code to overcome problems of self noise. A significant parameter associated with a system employing this technique is the amplitude of the coded signal applied to the transducer. The authors describe the development and application of a system having a transmitter capable of delivering peak-to-peak signals of 100 V. Measurements show that this instrument provides considerable signal-to-noise improvements when compared with conventional equipment.

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