DEDUCING SUBSURFACE PROPERTY GRADIENTS FROM SURFACE WAVE DISPERSION DATA.

John M. Richardson, Bernhard R. Tittmann

Research output: Contribution to conferencePaperpeer-review

Abstract

Because of the ill-posed nature of the problem, special mathematical techniques must be used to convert surface wave dispersion data into subsurface property measurement. The solution is approached within the framework of estimation theory. This approach starts with a mathematical model giving a probabilistic description of the possible results of measurement and then the optimal estimate is obtained as the most probable value within the constraints imposed by the actual measurements. The theory is applied to actual experimental data consisting of the phase velocities of Rayleigh surface waves in surface-hardened steel at a set of four wavelengths. The estimated profile of hardening is compared with independent destructive measurements. As a test, the theory is also applied at the same set of wavelengths to a set of synthetic data calculated from an assumed profile.

Original languageEnglish (US)
Pages488-491
Number of pages4
DOIs
StatePublished - 1975
EventUltrason Symp, Proc - Los Angeles, CA, USA
Duration: Sep 22 1975Sep 24 1975

Other

OtherUltrason Symp, Proc
CityLos Angeles, CA, USA
Period9/22/759/24/75

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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