Amplitude only V(Z) curve processing for spherical and cylindrical lenses

J. M. Rowe, Michael Geoffrey Somekh

Research output: Journal article publicationConference articleAcademic researchpeer-review

4 Citations (Scopus)


The authors propose a method of interpreting amplitude only V(z) curves, derivable from ray theory without arbitrary assumptions. The method has been applied to V(z) curves measured with both cylindrical and spherical lenses, achieving an absolute accuracy of Rayleigh velocity of better than one part in one thousand in each case. This level of accuracy matches that previously available only from cylindrical lenses. It is shown how optimal filtering of the V(z) curve may be performed to eliminate high-frequency coherent ripple due to internal lens reverberations and to minimize noise with minimum degradation of the actual curve. In numerical simulations the method has been shown to have a high degree of immunity from noise and to be effective for short ranges of defocuses. The processing algorithm has no arbitrary steps and should be easily capable of hands-off automation.
Original languageEnglish
Pages (from-to)909-913
Number of pages5
JournalUltrasonics Symposium Proceedings
Publication statusPublished - 1 Dec 1988
Externally publishedYes
EventIEEE 1988 Ultrasonics Symposium - Proceedings - Chicago, IL, United States
Duration: 2 Oct 19885 Oct 1988

ASJC Scopus subject areas

  • General Engineering


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