SED navigation bar go to SED home page go to SED publications page go to NIST home page SED Home Page SED Contacts SED Projects SED Products and Publications Search SED Pages

contents     previous     next

3.1.2 Acoustic Microscopy

James J. Filliben

Statistical Engineering Division, CAML

Nelson Hsu

Dan Xiang

Automated Technology Production Division, MEL

Acoustic microscopy is a newly-developed, low-cost alternate ultrasonic methodology that is superior to contact/transducer methods for non-tactile underwater identification of material type, orientation, velocity, roughness, stress, and/or attenuation. Acoustic microcopy is distantly related to radar technology-but at a much more refined level. Nelson Hsu and Dan Xiang of the Automated Production Technology Division of the Manufacturing Engineering Laboratory is carrying out state-of-the-art developmental work on acoustic microscopy.

The immediate goal of this project is to develop a prediction equation relating elapsed time of an acoustic microscopy signal to distance and other material properties.

Data from 15 experiments had already been collected. The prediction equation analysis was straighforward-consisting of the carrying out of linear or quadratic (as appropriate) fits for each and all of the 15 data sets. In addition, a Dataplot macro was written and provided so that the NIST scientists could carry out the analysis on their own PC's on similar such data sets.


Figure 2: Acoustic Microscopy. Assessing the quality and consistency of linear fits (of distance as a function of time) across all 15 data sets.

contents     previous     next

Date created: 7/20/2001
Last updated: 7/20/2001
Please email comments on this WWW page to