A multiple detector method was developed to extend the capabilities of phase stepped, real- time holographic interferometry to measure two components of a displacement vector simultaneously. To test the method, two experiments were performed which measured the cantilever bending of a piezoelectric ceramic bimorph due to an applied voltage. For the first experiment, the optical axis of one of the cameras was perpendicular to the surface of the bimorph while the optical axis of the second camera formed an angle of 48 degree(s) +/- 1 degree(s) with respect to the optical axis of the first camera. The bimorph was then rotated so that the angle between the optical axis of the first camera and the surface normal changed by 20 degree(s) +/- 1 degree(s). Both the out-of-plane (normal to the surface) and one of the in- plane (tangential) displacement components were resolved for each experiment and the results were compared with the known values.

Date Published: 3 September 1993
PDF: 12 pages
Proc. SPIE 1889, Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III, (3 September 1993); doi: 10.1117/12.155725

Published in SPIE Proceedings Vol. 1889:
Holography, Interferometry, and Optical Pattern Recognition in Biomedicine III
Halina Podbielska M.D., Editor(s)