Hologram Technology
Hologram . The images are directly from the fantasy world. But are these like awe-inspiring holographic scenes? In the future field of 3D technology, nothing
Holographic projection has been in operation since the 1940s, and 3D technology has evolved rapidly since then, although we still face many challenges in giving us a "see-see-like movie" experience. However, some revolutionary 3D holographic pioneers are breaking down the boundaries of holographic projection and shattering the status quo when bringing holograms to life.
In this article, we will learn more about what holographic projection is, its relationship with holograms, and how to guide the future of this technology .
What is a hologram?
Before we travel into the future, let’s take a trip back to the past and go back to the beginning so that we can know what a hologram is and ask ourselves, what exactly is a “holographic”?
The term "hologram " was coined in 1949 by the Hungarian-born British electrical engineer and physicist Denis Gabor, who later won the 1971 Nobel Prize in Physics for his work on the invention and development of the "holographic". Way.
Hologram is a combination of two Greek words - "holos" means "whole" and "gramma" means "message"; Coming together to create a complete message or in other words a complete film.
Unlike traditional photography, a hologram gives the impression of a three-dimensional image, or one another. Sometimes created using light in the form of lasers, different types of holographic techniques give different results.
How the holograph works
To create a hologram, you need an object (or person) that you want to record; Laser beam to illuminate the object and recording medium; Recording medium with materials needed to clarify the image; And the rays of light converge.
The laser beam is divided into two identical beams and redirected using a mirror. A split beam, an aura beam or one of the beam rays is directed at the object. Some light is reflected from the object in the recording medium.
A second ray called the reference ray is directed at the recording medium. In this way, it does not differ from any images coming from the object beam and coordinates with it to create a more accurate image of the hologram space.
The two beams intersect and reach each other. The intervention pattern is engraved on the recording medium to recreate the virtual image for our eyes to see.
Recording medium, where the lights meet, can be made of different materials. One of the most common uses for hologram construction is photographic film, which contains extra light-reactive grain. This allows the resolution of both beams to be higher, making the image look more realistic than using silver halide materials from the 1960s.
What are other types of holograms?
With the above examples, there are different types of holographic solutions. Here we look at some of the most popular, focusing only on those that do not require additional tools and can be seen with the naked eye.
"Pepper Ghost" effect
Paint the scene. In the year 2012, the venue was one of the most famous music festivals in the world held in Coachella, California. In the crowd, 80,000 fans are watching the rap icon Doctor Dre and Snoop Dogg stage.
The stage turns black as soon as they finish their set with "California Love", first performed by Dre and Legendary 2Pac. From the darkness, a toy appears. There, 2 PAC stands in front of the crowd. But how can this be? He died in 1996!
The dead rapper, who arrived on stage at Coachella, was, in fact, created by 3D projection, hologram effect. It was created using an old holographic technique called the "Ghost of Paper" effect and was later updated to take center stage at this world-class music festival.
It’s a way to recreate a ghost holographic image, however, it comes with its own challenges. Both of these types of holograms are here.
Holographic smokescreen
Similar to the "pepper pepper ghost" effect, the hologram works using artificially generated smoke or a semi-transparent mesh that is projected as a "screen" for the hologram. However, in this case, the projection instead comes from below. This creates a spectral image effect (ghost-like projection) that gives the impression of a hologram.
In contrast to 2Pac projection, holographic smoke screens and nets are widely used in theaters when calling for a general scene spectral image, usually designed to make this type of holographic projection appear slightly opaque. Let’s take a quick look at the pros and cons of holographic net technology.
Holographic Network
One of the latest technologies to enter the holographic world is holographic nets, an almost transparent curtain of LED lights that display images in a wide variety of colors. These LEDs are programmed to create images that provide a 3D holographic effect.
Holographic nets were used to cover buildings from small pictures to colorful pictures. They provide the right advertising opportunities for companies that display their brand in the lights.
Holographic Spinning Mirror Technique
Simple, yet effective solution. The 3D image is printed by placing a spinning mirror at an angle and displaying high-speed video on it, which reflects to create the display.
Developed at the University of Southern California (USC), the solution is a breakthrough in 3D holographic technology.
Semi-transparent OLED screen
In recent years, there has been a serious investment in transparent OLED screens with some big names in electronics manufacturing. These new inventions include screens filled with organic light-emitting diodes that respond to electric current and form an image.
In terms of 3D effects, the result looks like a 2D image 3D, creating the illusion of a hologram on the screen. However, it could be the future of TV in our living room and a new breakthrough in the world of advertising.
Holographic pyramid
These popular holographic solutions come in two forms: DIY holographic pyramids that you can place on top of your smartphone or tablet at home, or unethically more professionally constructed holographic cubes, which also include pyramids with screens, which many retailers sell online.
These hologram pyramids use a reflection similar to the "pepper ghost" effect, creating the appearance of floating 3D holograms in a context. This type of image works due to the 45ยบ position of the sides on the pyramid on the glass, which reflects the impression of a hologram.
While the technology is impressive, there are benefits to consumers.
Laboratory-only compositions
As we said at the beginning, the Star Wars world is not here yet, but the technology is real. And that's the million dollar question - "How do holograms work?" - Come on.
The latest solution created at Brigham Young University (US) is very different from the previous holographic projector operation of the "pepper ghost" effect, which involves more equipment and laboratory conditions.
In 2018, BYU's team released the news that they had created a real 3D hologram, or that they should call it a "volumetric image". The solution uses a laser to trap small particles and control their movements. This method is called "lab-only" because it is dangerous to build up and can lead to severe burns.
Additional color laser particles illuminate the path, making it visible. Think of it as an old photography trick that uses prolonged exposure to "write" with torches at night, but instead of flashlights and cameras you have lasers and more lasers.
History of Holography
The development of the hologram technique began in 1962, when Emmet Leith and Juris Optonics developed 3D object recording laser technology at the University of Michigan in the Soviet Union. Although the resolution of the objects mentioned at the time was not correct, silver halide photographic emulsion was used for the recording medium. But new methods of transmitting with a refractive index allowed holograms to improve over time.
The future of holography
Currently, holograms are static. The special influence of a reporter appearing live from another location on CNN and recent productions such as the late Tupac Shakur "Live" at the concert are not "proper" holograms.
However, new holographic technology is being developed that can project 3D images from another location in real time. Images are also consistent, but they refresh every two seconds, creating a strobe-like effect. The technology is expected to improve over the next few years to bring researchers higher resolution and faster image streaming.
And in March 2013, a team of researchers at Hewlett-Packard Laboratories announced the development of mirrorless, multi-perspective, 3D display technology for mobile devices.
About the Post
In this Post I told you what is a hologram, how the holograph work, types of holograph, history of holography & the future of holography.
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