Holographic technique is a technique that records and reproduces the real three-dimensional image of an object by using the principle of interference and diffraction.
The traditional holographic imaging method uses the principle of laser interference to produce holographic images. The light emitted by the laser source is divided into two beams, one is directed to the photosensitive film, and the other is reflected by the object and then directed to the photosensitive film. Two beams of light superimpose on the photosensitive plate to produce interference. Finally, the reconstructed hologram is further processed by using the basic principle of digital image to remove digital interference and obtain a clear hologram. This method requires high monochromaticity.
Current holographic imaging techniques are generally divided into three categories:
The first is the need for virtual reality or augmented reality glasses or helmet, such as Microsoft’s Helo Lens, etc. This technology has limited application scenarios and is currently expensive because of the need for assistive devices.
The second one needs to use the high-speed rotating reflector and the high-speed refresh projector to project the image on the high-speed rotating reflector so as to realize the three-dimensional image.
The third is to project the image onto the small droplets formed by the liquefaction of water vapor by means of medium containing fine particles, such as air containing water vapor. Because of the uneven vibration of molecules, the image with strong layers and stereoscopic sense can be formed.
Generally speaking, the above technologies, either imaged in virtual reality or augmented reality tools, or imaged in high-speed rotating reflectors, or imaged in the air of vapor particles, are not in the real sense of aerial imaging.
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