Application Of Pulsed Laser Holography To Nondestructive Testing Of Aircraft Structures

Hubert Fagot; Paul Smigielski; Jean-Louis Arnaud

doi:10.1117/12.967805

1 March 1983 Application Of Pulsed Laser Holography To Nondestructive Testing Of Aircraft Structures

Hubert Fagot, Paul Smigielski, Jean-Louis Arnaud

Proceedings Volume 0348, 15th Intl Congress on High Speed Photography and Photonics; (1983) https://doi.org/10.1117/12.967805
Event: 15th International Congress on High Speed Photography and Photonics, 1982, San Diego, United States

Abstract

Subsequently to laboratory tests, experiments were conducted on an aircraft undergoing maintenance in order to assess the possible uses of holographic interferometry for non-destructive testing of large aircraft structures. A double ruby laser was used delivering two pulses with a duration of 20 ns each. The two pulses are separated by an arbitrary time interval At which is determined as a function of both the amplitude and frequency of the surface displacement. Shocks of the order of 100 mJ cause the structure under investigation to vibrate, the time interval At thereby ranging from 10 to 100 ps for a delay of a few ms after shock initiation. The method used is relatively insensitive to environmental disturbances. Although the laser delivers pulses of light of less than 100 mJ in energy, it is possible to visualize a field of 0.5 x1 m. Some results will be reported which have been obtained at the lower surface of an aerofoil, on a wheel well and on an air-brake. Finally a brief review will be made on the improvements envisaged on both the laser and the recording method in order to obtain an operational system for holographic non-destructive testing.

Citation Download Citation

Hubert Fagot, Paul Smigielski, and Jean-Louis Arnaud "Application Of Pulsed Laser Holography To Nondestructive Testing Of Aircraft Structures", Proc. SPIE 0348, 15th Intl Congress on High Speed Photography and Photonics, (1 March 1983); https://doi.org/10.1117/12.967805

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