Accession Number : ADA117264

Title :   Investigation of the Rayleigh Critical Angle Phenomenon for the Characterization of Surface Properties.

Descriptive Note : Final rept. Mar 81-Apr 82 on Phase 1,


Personal Author(s) : Hildebrand,B P ; Fitzpatrick,G L ; Boland,A J

PDF Url : ADA117264

Report Date : 14 Apr 1982

Pagination or Media Count : 85

Abstract : An automated, computer controlled goniometer was constructed and perfected. Controlled measurements on a variety of materials, including materials of interest to the NDT community, were carried out and compared with theoretical predictions made by a number of authors. Experimental results indicate that these theories may be only first approximations to reality. A number of significant experimental anomalies, such as the appearance of more than one amplitude dip were found. Certain theoretical questions were raised regarding these theories including the question of momentum conservation at the interface. Both the experimental and theoretical observations suggest that modifications to existing theory may be necessary. (Author)

Descriptors :   *Nondestructive testing, *Rayleigh waves, *Surface properties, Angles, Measurement, Control, Amplitude, Ultrasonic tests, Automation, Theory, Predictions, Scientific literature, Experimental data

Subject Categories : Test Facilities, Equipment and Methods
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE