Effective Data Acquisition and Retrieval of Holographic Interferograms

Paper presented at a Conference on “Holographic Measurement, Speckle and Allied Phenomena” organized joint by the Holographic Group of the Royal Photographic Society and the Central Electricity Generating Board, 16-17 April 1985 at the CEGB headquarters, in London, England.

Abstract

Holographic techniques used in strain analysis require effective data acquisition and retrieval of large amounts of interferometric information. In this paper we describe a new method where the problem is solved by combining the speed of TV- holography (ESP1) with the memory capacity of video tape. Primary speckle interferograms representing various illumination directions are stored using a video tape recorder. During subsequent read-out the recordings are combined and analyzed using a digital frame memory which provides complete contour and deformation maps.

Notes

Paper presented at a Conference on “Holographic Measurement, Speckle and Allied Phenomena” organized joint by the Holographic Group of the Royal Photographic Society and the Central Electricity Generating Board, 16-17 April 1985 at the CEGB headquarters, in London, England.