| 摘要 |
<p>An apparatus for holographic imaging consists of a pulsed laser beam source (1) and an optical assembly which splits the beam into an object beam (3, 3') and a reference beam (4, 4'). The object beam (3') is directed to illuminate an object and the reference beam (4') is directed onto a photorefractive crystal (8). The photorefractive crystal (8) and the object (7) are located so that light reflected from the object forms an interferogram in a plane in which the crystal (8) is located. A CCD camera (9) is disposed to view the crystal (8) and thus to transform the interferogram which is temporarily recorded on the crystal (8) into electrical signals which can then be recorded for subsequent processing in the electronic memory of a data processing system (11). The camera (9) and crystal (8) can be mounted on a carriage (10) so that the crystal (8) can be scanned through the interferogram and the elements of an interferogram larger than the crystal (8) recorded electronically as a sequence of frames.</p> |
