The well developed techniques of coherent detection and signal averaging may be used to extend the range and accuracy of measurements of ultrasonic velocity and attenuation. Significant improvements in signal-to-noise ratio are obtained by averaging a coherently detected echo train in a signal averager such as a multichannel analyzer or boxcar integrator. A standard circuit of this type is described and analyzed. Comparison of coherent detection and rectification shows the inherent advantages of coherent detection for signal-to-noise enhancement.
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R.C. Williamson (1969) studied this question.
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