The distinction of the odd photographic and hologram & Hologram characteristics

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The distinction of the odd photographic and hologram & Hologram characteristics

Common photographic technique, based on the basis of geometrical optics, optical lens on the thing picture on the movie, the recorded intensity of the optical signal only. Photographic movie by printing (developing and fixing) process, is product of a photograph file two-dimensional info of the item and a airplane image.

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Holography relies on physical optics principle, the light emitted by the article all the knowledge signal, including amplitude and section of light waves to file all information. It reflects off of the three-dimensional object properties. The tactic of recording the hologram of the hologram and the image cannot instantly see the thing, however solely the item wave and the reference wave interference fringes formed.

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As a way to reproduce the unique object gentle, the need to use the identical as the reference gentle beam irradiation hologram. Because all hologram interference fringes recorded on the "diffraction", which can reproduce the identical as the unique object wave light, when the hologram might be seen by way of the original three-dimensional picture of objects.

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Holography additionally referred to as "two-step imaging approach": the first step is "recording", is definitely the object mild and the reference light interference fringes of light depth is stored in the film, holographic recording is so gentle based mostly on the precept of interferometry; step is "replica", that light diffracted by the hologram process, the noticed diffraction pattern is holographic, therefore, Hologram relies on the diffraction of sunshine primarily based on the theory. Will be talked about later, the white replica of the "rainbow holography" will also be just one step.

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Holography addition to the traits of a 3-dimensional imaging, which recorded info may be very wealthy, every level on the movie file of all the knowledge of the subject, and therefore, even when the hologram broken, the fragments can nonetheless be used to breed the picture of the thing . In addition, the hologram could be repeated with a record number of different objects similar to mutual info without making the copy.

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In 1948, Gabor order to improve the resolving power of the electron microscope made holography and hologram analysis began with the emergence of laser for holographic expertise offers ideally suited gentle source, from holographic expertise research into a brand new phase. About holographic characteristics, the system summarized as follows.

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Hologram recording and reproduction of the wavefront could be observed with a way of three-dimensional actual image.

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Hologram lens can't imaging. Hologram imaging component itself plays a role in the case of the Fresnel hologram, the reconstructed image of the conjugated image is actual, although no use as a lens to convey this type of aberration, however not perfect, the background noise is present.

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Diffuse hologram. Diffuser-like object made from a hologram, the thing level on the hologram on the connection at some extent (different from the imaging lens), and a diffuse space, so took a small piece of the hologram are can reproduce the original's total picture, simply as the sector dimension or depth change.

Since using the photosensitive materials can be stable (dry plate), and thus can be stored in a small area is huge quantity of information. Recording a hologram photosensitive material used in the emulsion layer of a certain thickness, so extra data will be recorded, but additionally capable of replication and the transfer hologram.

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The optical information might be exchanged. If among the info on the reference object is modulated mild, copy, the data contained in the object light and the reference mild could also be contained in the info change, the holographic encryption technology.

Hologram can be used for optical information processing technology in a spatial filter.

No matter how the characteristics of the movie contrast, reproduced as is all the time the case with the unique mild intensity could be very shut, despite using excessive-contrast negatives, but the tone continues to be not misplaced reconstructed image.

Nevertheless, the hologram should use some particular device, and photographic conditions are stringent.

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Must be good coherence gentle source, resembling a laser. It's essential to use a excessive-decision hologram dry plate; Holographic there are nonetheless some shortcomings.

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