How to understand holographic projection devices? What equipment is needed to implement holographic

Holographic projection is a type of 3D technology, which originally refers to the technology that uses the principle of interference to record and reproduce the real three-dimensional image of an object. However, the holograms that we usually know are often not holographic projection in the strict sense, but a holographic projection technology that uses Pepper illusion, edge blanking and other methods to achieve 3D effects. The holographic projection produced by (Heishe black camera holographic naked-eye 3D technology) integrates virtual imaging technology, naked-eye 3D technology and holographic projection technology, which can display holographic projection technology more perfectly.

Front-projected holographic display is a type of 3D technology, which originally refers to the technology that uses the principle of interference and diffraction to record and reproduce the real three-dimensional image of an object. Later, with the guidance of science fiction films and commercial promotion, the concept of holographic projection gradually extended to commercial activities such as stage performances and exhibitions. But the holograms we usually know are often not holographic projection in the strict sense, but a holographic projection technology that uses Pepper illusion, edge blanking and other methods to achieve 3D effects.

"Holo" comes from the Greek word "holo", which means "complete information", that is, it contains information about the amplitude and phase of the light waves. Ordinary photographic techniques only record the intensity (amplitude) of the light, while the depth information (phase) is lost. In the interference process of holographic technology, the superposition of wave peaks and peaks will be higher, and the superposition of peaks and troughs will be flattened, so a series of irregular, light and dark stripes will be generated, so that the phase information will be converted into intensity information and recorded on the photosensitive material.

Holographic projection equipment includes: holographic projector, holographic projection screen, holographic projection film, holographic projection content production, etc. Holographic projection is divided into 180-degree holographic projection and 360-degree holographic projection.

Holographic technology can be subdivided into optical holography technology, digital holography technology, computational holography technology, microwave holography technology, reflection holography technology, sound holography technology and so on. Applied in various fields such as display, measurement, encryption, and identification, our common traditional holographic technology is optical holographic technology.

Holographic projection technology is a popular high-tech technology in recent years, and its empty key beam is a promotion method that uses a holographic film with projection and then image content to display products. It provides magical holograms that can be imaged on glass or acrylic materials.

This new interactive display technology integrates decoration and practicality, and is completely transparent when there is no image, giving users a new interactive experience, becoming one of the most fashionable means of product display and marketing today.

Front-projected holographic display, also known as virtual imaging technology, is a technology that uses the principle of interference and diffraction to record and reproduce the real three-dimensional image of an object.

The first step is to use the principle of interference to record the light wave information of the object, which is the shooting process: the photographed object forms a diffuse object beam under laser irradiation; The other part of the laser is used as a reference beam to shoot on the holographic negative, which is superimposed with the object beam to produce interference, and converts the phase and amplitude of each point on the object light wave into the intensity of spatial variation, so as to record all the information of the object light wave by using the contrast and spacing between the interference fringes. The negative recording of interference fringes becomes a hologram, or holographic**, after being developed and fixed.

The second step is to use the principle of diffraction to reproduce the light wave information of the object, which is the imaging process: the hologram is like a complex grating, and under the irradiation of a coherent laser, the diffraction light wave of a linearly recorded sinusoidal hologram can generally give two images, namely the original image (also known as the initial image) and the conjugated image. The reproduced image has a strong sense of three-dimensionality and has a realistic visual effect.

Each part of the hologram records the light information of each point on the object, so in principle, each part of it can reproduce the entire image of the original object, and can record a number of different images on the same negative by multiple times, and can be displayed separately without interfering with each other.

The current 3D technologies (not holographic) that have been implemented are mainly the following:

Air Projection and Interaction Technology: A 29-year-old science and engineering graduate named Chaddyne in Massachusetts invented an air projection and interaction technology, a milestone in display technology that can project interactive images on walls formed by air currents. The principle of this technology **mirage, the image is projected on the small water droplets formed by the liquefaction of water vapor, and due to the uneven vibration of the molecules, it can form a strong image with a strong sense of hierarchy and three-dimensionality.

A laser beam projects a 3D image of an entity: This technique uses nitrogen and oxygen to disperse in the air, and the mixed gas becomes a hot slurry substance, forming a brief 3D image in the air. This method is mainly achieved by constantly performing small blasts in the air.

360-degree holographic display: This technology projects an image on a high-speed rotating mirror to achieve a three-dimensional image.

Edge blanking technology: The "holographic" technology we see on the Spring Festival Gala, concerts, and stages is basically this kind of technology, projecting the picture onto the holographic film or reflecting it onto the holographic film, and then using the dark field to hide the holographic film, thus forming the effect of the image suspended in the air.

Rotating LED display technology: This technology uses the principle of visual persistence to achieve plane imaging through the high-speed rotation of LED, but because the LED light bar is not airtight when rotating, the observer can still see the object behind the light bar, so that the observer feels that the picture is suspended in the air and achieves a 3D similar effect.

The principle of holographic projection is divided into two steps, the first step is to use the principle of interference to record the light wave information of the object, which is the shooting process: the photographed object forms a diffuse object beam under laser irradiation; The second step is to use the principle of diffraction to reproduce the light wave information of the object, which is the imaging process: the hologram is like a complex grating, and under the irradiation of a coherent laser, the diffracted light wave of a linearly recorded sinusoidal hologram can generally give two images, namely the original image (also known as the initial image) and the conjugate image.

Like (Heishe black camera holographic naked-eye 3D technology) has been holographic projection simplified, tends to be simple and process-oriented, and can be used everywhere in life, and can be achieved.

Holographic projection is a technology that uses optical technology to project a three-dimensional image into the air to form a three-dimensional image. It uses light sources such as lasers or LEDs to decompose the image into many tiny light tremor points, and reconstructs these light points into a three-dimensional image through optical principles such as interference and diffraction, so that people can see realistic three-dimensional images in the air. The vertical holographic projection technology has a wide range of applications in display, advertising, education, medical and other fields.