AUTOMATED COMPUTER-CONTROLLED SLITS
The second LCD screen is at the heart of the automated digital holographic camera system. Through timing programmed into the software, it allows light (laser reference beam and image wavefront) to reach the holographic plate in a very precise and controlled manner (slits) -- via transmission Liquid Crystal Display panel, for a user-specified amount of exposure time.
This sync-information is fed to a transmission LCD screen which is placed in front of the master holographic plate. The LCD screen is kept 100% opaque except for a narrow slit that moves across the screen. As the slit moves, it allows laser light to expose that area of the holographic plate. It is also timed in-sync with a series of photographic images (image wavefront) that are rear-illuminated via laser light on another LCD screen (that the master hologram is "looking" at).
As slit one flashes, image one also shows on the object LCD screen. As slit two flashes, image two shows on the object LCD screen . . . and so on and so forth until all slits/images have been cycled and recorded by the master holographic plate.
The above animation shows the slits as they would move for a one second exposure for each slit for a total of 20 frames of perspective. Depending on the width of the slits (and the width of the associated master plate) hundreds of exposures could be made automatically in this fashion . . . allowing several seconds of smooth motion in the final hologram.
To see the animation repeat, just scroll back up to the top and reload this page.
I am now working on the image animation sequence. Once completed, I will upload the animation in two ways: (1) just the image animation; and (2) the image animation, side-by-side with the slit movement to show them in-step with one another.