Active doublet method for measuring small changes in physical pr

Measuring and testing – Vibration – By mechanical waves

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G01N 2904, G01R 3320

Patent

active

053699971

ABSTRACT:
Small changes in material properties of a work piece are detected by measuring small changes in elastic wave velocity and attenuation within a work piece. Active, repeatable source generate coda wave responses from a work piece, where the coda wave responses are temporally displaced. By analyzing progressive relative phase and amplitude changes between the coda wave responses as a function of elapsed time, accurate determinations of velocity and attenuation changes are made. Thus, a small change in velocity occurring within a sample region during the time periods between excitation origin times (herein called "doublets") will produce a relative delay that changes with elapsed time over some portion of the scattered waves. This trend of changing delay is easier to detect than an isolated delay based on a single arrival and provides a direct measure of elastic wave velocity changes arising from changed material properties of the work piece.

REFERENCES:
patent: 5095465 (1992-03-01), Stokoe II
G. Poupinet et al., "Monitoring Velocity Variations in the Crust Using Earthquake Doublets: An Application to the Calaveras Vault, California," 89 J. Geophys. Res., No. B7, pp. 5719-5731 (July 1984).

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