As first speaker of this meeting about the holographic non destructive testing, I think it's perhaps important to understand the new possibilities of the holography in the field of the non destructive testing to know before the progress of the other and sometimes the old non destructive methods as radiography and ultrasonic testing. The first question is : why it is necessary to make non destructive tests. We can separate two kinds of application field : First one : quality assurance before, during and after the fabrication of a piece or a construction. Second one : control in service during the use of this piece or construction. For the first field, we can see thanks the first figure that it exists an optimalization of the non destructive testing who gives the maximum benefit. To prepare the future an industry must assure the quality of his product a little beyond the maximum benefit.
J. Charlier, J. Charlier,
"Limits Of Nondestructive Testing By Ionizing Radiation", Proc. SPIE 0349, Industrial Applications of Holographic Nondestructive Testing, (25 October 1982); doi: 10.1117/12.933865; https://doi.org/10.1117/12.933865