Holographic Nondestructive Testing With Cw Lasers Away From The Laboratory

A. E. Ennos

doi:10.1117/12.933869

25 October 1982 Holographic Nondestructive Testing With Cw Lasers Away From The Laboratory

A. E. Ennos

Proceedings Volume 0349, Industrial Applications of Holographic Nondestructive Testing; (1982) https://doi.org/10.1117/12.933869
Event: Industrial Applications of Holographic Nondestructive Testing, 1982, Brussels, Belgium

Abstract

Since the invention of interference holography in 1965, attempts have been made in laboratories throughout the world to adopt it as a practical tool for industry. The difficulties of doing this in a workshop environment are well-known, so that, as far as possible, studies of mechanical deformation and vibration have been carried out in the laboratory. Even so much ingenuity has to be exercised in the design of work holder and means of applying load or excitation to the component under investigation. At the National Physical Laboratory we have gained considerable experience in solving practical problems of this nature, often in the course of carrying out work under contract from a manufacturer. However, the ultimate aim of our work is to develop techniques that can be used directly in an indus-trial environment, preferably without the need to employ skilled scientific staff. Two approaches can be made to achieve this: 1) to develop a "conventional" holographic system tailored to the particular testing that is required, and to design it for easy and safe operation by NDT engineers. 2) to employ special holographic techniques that are relatively insensitive to the inevitable movements of the component under study that occur under workshop conditions. The latter can of course be achieved by employing pulsed lasers, but our work has been confined to the use of C.W. Laser systems, which 'are considerably easier and cheaper to implement.

Citation Download Citation

A. E. Ennos "Holographic Nondestructive Testing With Cw Lasers Away From The Laboratory", Proc. SPIE 0349, Industrial Applications of Holographic Nondestructive Testing, (25 October 1982); https://doi.org/10.1117/12.933869

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KEYWORDS

Holography

Photography

Holograms

Nondestructive evaluation

Speckle

Optical design

Aluminum

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