The ability to measure in-plane displacement on the surface of a rotating structure under service conditions and real-time analysis to provide component strain distributions would form the ideal experimental optical technique. Pulsed Laser ESPI which can display interference patterns for in-plane displacement in conjunction with the Fourier transform method of fringe analysis is one attractive approach which is coming closer to this ideal. The optical system used enables a wide range of rotational speeds to be covered with tangential velocities up to 300 ms^-1. The paper describes how the fringe analysis may be carried out using a 80486 desk top computer.

Date Published: 28 May 1993
PDF: 19 pages
Proc. SPIE 1821, Industrial Applications of Optical Inspection, Metrology, and Sensing, (28 May 1993); doi: 10.1117/12.145565

Published in SPIE Proceedings Vol. 1821:
Industrial Applications of Optical Inspection, Metrology, and Sensing
Gordon M. Brown; Kevin G. Harding; H. Philip Stahl, Editor(s)