Accession Number : AD0777524

Title :   Preliminary Evaluation of a Proposed Laser-Operated Flaw Detection Technique,

Corporate Author : HARRY DIAMOND LABS WASHINGTON D C

Personal Author(s) : Giglio,Dominick A.

Report Date : DEC 1973

Pagination or Media Count : 26

Abstract : A preliminary investigation of a proposed flaw detection technique was conducted. Conventional flaw-detection schemes employ piezoelectric transducers and use the reflection of acoustic energy inside the sample to locate irregularities. The method generally requires positioning the item in a testing tank or in a flowing-fluid test fixture to facilitate better input and output coupling of the acoustic energy. This requirement, which represents a serious drawback in the testing procedure, is completely avoided in the proposed scheme. The proposal entails the use of a laser to launch an acoustic wave in the test object, and a separate laser interferometer system to detect the reflected wave. The required rough surface interferometer has been successfully operated and may have applications other than proposed here. Tests were also made on the optical generation of acoustic waves, and results indicate that further consideration of the proposed system is merited. (Author)

Descriptors :   *Acoustooptics, *Nondestructive testing, *Defects(Materials), Detection, Acoustic waves, Lasers, Detectors, Interferometers

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE