Abstract

A system for fringe evaluation in hologram interferometry is studied in which a conjugate reconstruction beam scans the hologram, and the resulting fringe motion is observed in the real image of the object. The principle is suitable for semiautomatic evaluation. An earlier article presented a detailed theoretical analysis of the measuring principle, and the present paper deals with the practical aspects. It is shown that the system is capable of interpolating fringes to 1/100 of a fringe, which is experimentally verified by the determination of 3-D displacement components with an accuracy of about 40 nm and of strain with an accuracy of about 10 μstrain over an observation length of 1 cm. An analysis of the different error sources shows that the mechanical measures of the recording and evaluation setup have to be known to a small fraction of a millimeter.

© 1978 Optical Society of America

Analysis of a system for hologram interferometry with a continuously scanning reconstruction beam

Leif Ek and Klaus Biedermann
Appl. Opt. 16(9) 2535-2542 (1977)

Strain measurement by heterodyne holographic interferometry

Ruedi Thalmann and Rene Dändliker
Appl. Opt. 26(10) 1964-1971 (1987)

Holographic strain analysis: an experimental implementation of the fringe-vector theory

Ryszard J. Pryputniewicz
Appl. Opt. 17(22) 3613-3618 (1978)

Statistical analysis of errors in holographic interferometry

D. Nobis and C. M. Vest
Appl. Opt. 17(14) 2198-2204 (1978)

Homogeneous deformations: determination by fringe vectors in hologram interferometry

Karl A. Stetson
Appl. Opt. 14(9) 2256-2259 (1975)