Holography links
Holography was invented by Dennis Gabor, who received the
Nobel Prize for his work.
Michelson interferometer
Laser lab image
Transmission holography set-up diagrams
Transmission holography set-up image
Transmission holography compact set-up diagram
Transmission holography compact set-up image 1
image 2
Reflection holography set-up diagrams.
Transmission vs. reflection hologram comparison
Comparison of holography, photography
Resolution of recording media.
Holographic interferometry and recording media.
Bend fringes
Bend fringes, dynamic
This is a holographic image of a cantilever bar fixed at the left via an optical mount containing two vertical steel stalks that can be seen in the image. The bar is loaded on the right via a dead weight. The hologram is a double exposure of the bar without a load and with a load.The camera movement is in the vertical direction. Fringe motion is proportional to the vertical displacement of the point viewed on the bar.
Fringe interpretation in holographic interferometry
Dynamic Fringe interpretation in the lab
Fringe spacing and direction
Fringe interpretation example: torsion
The holographic fringes in the static and dynamic images illustrate the analysis. The top and bottom of the bar were twisted in opposite directions. Observe the hyperbolic pattern of fringes.
In the dynamic image the camera is moved horizontally. Fringe motion corresponds to object point motion in the horizontal direction. Warp in this square section bar is in the vertical direction. Here is a longer (one meg) clip of fringe
motion.
Warp is not revealed in the above images since the camera movement is orthogonal to the direction of the warp. To reveal warp, the observer may move along the bar axis and use the dynamic fringe interpretation method; alternatively, an image may be taken with oblique illumination with a component along the bar axis.
Supplementary holography links
Shelton article, holography in orthopaedics.
Bone plate deformation fringes
Metal bone plug fringes
Polyethylene
bone plug fringes
Biomechanics application of holography
Fracture fixation for bones
Medical imaging
Osteology
Tooth motion by holography
Holographic Printing.
Holography research