Accession Number : ADA192390

Title :   Attachable Interferometric Strain Gages.

Descriptive Note : Final rept. 1 Oct 85-30 Sep 87,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Sharpe, William N , Jr ; Wang, K C

PDF Url : ADA192390

Report Date : Feb 1988

Pagination or Media Count : 27

Abstract : Laser based interferometry from tiny reflective indentations can be used to measure in-plane strain/displacement over a very short gage length (on the order of 100 um). If the specimen material is not reflective, then some other means of generating the interference patterns must be found. This report describes two kinds of attachable gages: plated acetate replicas of indentations and reflective foils that are indented after application. In either case, the gage is applied with the techniques used for foil resistance gages and the gage itself is very small. The manufacturing procedures are described. Keywords: Strain measurement, Interferometry, Short gage length.

Descriptors :   *INTERFEROMETRY, *STRAIN GAGES, ACETATES, FOILS(MATERIALS), INTERFERENCE, MANUFACTURING, PATTERNS, PLATING, REFLECTION, REPLICAS, ATTACHMENT, LENGTH, LASER APPLICATIONS

Subject Categories : Test Facilities, Equipment and Methods
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE