Holograms: Difference between revisions
No edit summary |
No edit summary |
||
| Line 13: | Line 13: | ||
The information about light is coded in the form of bright and dark microinterferences. Usually, these are not visible to the human eye due to the high spatial frequencies. Reconstructing the object wave by illuminating the hologram with the reference wave creates a 3D image that exhibits the effects of perspective and depth of focus <ref name=”2”></ref>. | The information about light is coded in the form of bright and dark microinterferences. Usually, these are not visible to the human eye due to the high spatial frequencies. Reconstructing the object wave by illuminating the hologram with the reference wave creates a 3D image that exhibits the effects of perspective and depth of focus <ref name=”2”></ref>. | ||
This photographic technique of recording light scattered from an object and presenting it as a 3D image is called Holography. The object representations created with this technique are the most lifelike 3D renditions because it uses the same technique as our eyes to see the world around us <ref name=”4”> Workman, R. (2013). What is a hologram? Retrieved from http://www.livescience.com/34652-hologram.html</ref> <ref name=”5”> Bryner, M. (2010). ‘Star Wars’-like holograms nearly a reality. Retrieved from http://www.livescience.com/10227-star-wars-holograms-reality.html</ref>. Therefore, it is an attractive imaging technique since it allows the viewer to see a complete three-dimensional volume of one image <ref name=”6”> Rosen, J., Katz, B. and Brooker, G. (2009). Review of three-dimensional holographic imaging by | This photographic technique of recording light scattered from an object and presenting it as a 3D image is called Holography. The object's representations created with this technique are the most lifelike 3D renditions because it uses the same technique as our eyes to see the world around us <ref name=”4”> Workman, R. (2013). What is a hologram? Retrieved from http://www.livescience.com/34652-hologram.html</ref> <ref name=”5”> Bryner, M. (2010). ‘Star Wars’-like holograms nearly a reality. Retrieved from http://www.livescience.com/10227-star-wars-holograms-reality.html</ref>. Therefore, it is an attractive imaging technique since it allows the viewer to see a complete three-dimensional volume of one image <ref name=”6”> Rosen, J., Katz, B. and Brooker, G. (2009). Review of three-dimensional holographic imaging by Fresnel incoherent correlation holograms. 3D Research, 1(1)</ref>. | ||
Throughout the years, several types of holograms have been created. These include transmission holograms, that allow light to be shined through them and the image to be viewed from the side, and rainbow holograms. These are common in credit cards and driver’s licenses (used for security reasons) <ref name=”4”></ref>. | Throughout the years, several types of holograms have been created. These include transmission holograms, that allow light to be shined through them and the image to be viewed from the side, and rainbow holograms. These are common in credit cards and driver’s licenses (used for security reasons) <ref name=”4”></ref>. | ||