Patent ID: 6522409
Filing Date: 2003-02-18
Classification: G01B

Abstract:
A method for non-destructive inspection of an investigation area of an object by use of optical holographic interferometry technique in real-time scale:registering a first hologram of the investigation area of the object; developing the first hologram in a registering medium in a holographic camera; loading the investigation area of the object; and simultaneously illuminating both the investigation area of the object and the registering medium containing the developed holographic image of the investigation area of the object in the initial state with coherent light, thus forming an interferogram of the investigation area of the object as a result of interference between the two light waves which corresponds to the light waves scattered off the investigation area of the object before and after loading, where the illumination of the investigation area on the object with coherent light and the collection of the coherent light which scatters off the same area are performed at the object insitu while the registration and development of the holographic image and formation of the interferogram of the investigation area of the object are performed in another location in a distance from the object by transporting the coherent light between the light source, investigation area of the object and holographic camera in a single-mode light guidance cables, and where the formation of the holographic image and interferogram of the investigation area are protected from relative displacements of the object, holographic camera and/or light source by transporting the coherent light between the object, light source, and holographic camera in single-mode light guidance cables, and by ensuring that the endpoints of the single-mode light guidance cables are securely attached a fixed distance from an object module containing the investigation area of the object, and between the recording medium of the holographic camera and light source, respectively.