Share Email Print
cover

Proceedings Paper

Evaluation of phase objects by pulsed TV holography and defocused speckle displacement
Author(s): Eva-Lena Johansson; Lars Benckert; Mikael Sjodahl
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

An optical measurement method is presented for the evaluation of phase objects. Pulsed TV holography in combination with digital speckle photography gives the possibility to study transient events. The phase object is placed in front of a diffuser, on which a CCD camera is focused. Holograms are recorded, with and without the phase object present. The speckle patterns are reconstructed and transformed to different imaging planes using a phase field for propagation. Speckle displacement fields are then calculated for the different imaging planes, which visualize the change of refractive index or phase gradients caused by the phase object. Together with the phase information in the hologram even more information is obtained. A flow of helium gas and a positive weak lens are used as phase objects in two test experiments.

Paper Details

Date Published: 30 May 2003
PDF: 6 pages
Proc. SPIE 5144, Optical Measurement Systems for Industrial Inspection III, (30 May 2003); doi: 10.1117/12.500582
Show Author Affiliations
Eva-Lena Johansson, Lulea Univ. of Technology (Sweden)
Lars Benckert, Lulea Univ. of Technology (Sweden)
Mikael Sjodahl, Lulea Univ. of Technology (Sweden)


Published in SPIE Proceedings Vol. 5144:
Optical Measurement Systems for Industrial Inspection III
Wolfgang Osten; Malgorzata Kujawinska; Katherine Creath, Editor(s)

© SPIE. Terms of Use
Back to Top