Chapter: Fiber optics and Laser instruments : Holography and Medical Application
Holographic Non-Destructive Testing
Holographic Non-Destructive
Testing
A single
large ultrasonic transducer which sends out ultrasonic waves towards the object
under study and it scans the object. The scattered waves from the object from
the object waves. A received transducer collects the scattered object wave and
converts them into electrical signals. The reference electrical waves are given
by the RF oscillator and these object to reference waves are made to
interference by the electronic adder. The interference pattern is formed on the
fluorescent screen of the cathode photographic film is developed.
The
developed photographic film serves as a hologram. The hologram is illuminated
by a low power laser like He- Ne laser which acts as the optical reference
source. The T.V camera takes the videograph of the 3 D image of the object and
it displays on the T.V monitor
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