Front-projected holographic display, also known as virtual imaging technology, is a technique for recording and reproducing the recording and reproduction of a true three-dimensional image of an object using the principles of interference and diffraction.
The first step is to record the light wave information of the object by using the interference principle. This is the shooting process: the object forms a diffuse object beam under laser irradiation; the other part of the laser beam is used as a reference beam to the holographic film, and the object beam is superimposed. Interference is generated to convert the phase and amplitude of each point on the object's light wave into a spatially varying intensity, thereby recording all the information of the object light wave using the contrast and spacing between the interference fringes. After the film on which the interference fringes are recorded is subjected to processing procedures such as development and fixing, it becomes a hologram, or hologram.
The second step is to use the principle of diffraction to reproduce the light wave information of the object. This is the imaging process: the hologram is like a complex grating. Under the coherent laser illumination, the diffracted light wave of a linearly recorded sinusoidal hologram can generally give two The image, the original image (also known as the initial image) and the conjugate image. The reproduced image has a strong stereoscopic effect and has a real 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, and multiple different images can be recorded on the same film by multiple exposures. And they can be displayed separately without interference.
On September 13, 2013, the 18-year-old singer Teresa Teng “crossed the time and space for 210 seconds†and sang with the male singer Jay Chou. The unique holographic projection technology quickly became a hot topic in the news media, causing great interest and attention. . Holographic projection equipment is expensive and is generally used in commercial exhibitions or film and television special effects. For the majority of primary and secondary school science teachers, as long as the application of common experimental equipment in life, the low cost of economic costs, can also make a simple holographic projection demonstration experiment, bringing students a new scientific experience and fun.
Holographic projection principleHolographic projection technology, also known as virtual imaging technology, uses light interference and diffraction principles to record and reproduce real three-dimensional images of objects.
The first step is to record the light wave information of the object by using the interference principle. The object is formed into a diffuse object beam under laser irradiation; the other part of the laser beam is incident on the holographic film as a reference beam, and the object beam is superimposed to generate interference, and the object light wave is generated. The phase and amplitude of the upper points are converted into spatially varying intensities, and all information of the object light waves is recorded using the contrast and spacing between the interference fringes. After the film of the interference fringe is processed by development, fixing, etc., it becomes a hologram, or hologram.
The second step is to reproduce the object's light wave information using the principle of diffraction, which is the imaging process. Each part of the hologram records the light information of each point of the object, and can reproduce the entire image of the original object. By multiple exposures, a plurality of different images can be recorded on the same negative film and displayed separately without interference. The holographic projection system suspends the three-dimensional picture in the real scene, the contrast and clarity of the picture is high, and the sense of space and perspective creates a magical atmosphere. Holographic projections fall into two categories depending on the means and means of implementation.
1) Transmission holographic projection: The reconstructed image is observed from the other direction by irradiating the holographic projection film with laser light. Transmission holographic projection of white can be used: Ma Yanhua, Tan Yuanyuan, physics lab College of Guangxi University for Nationalities, research direction for physics experiments and educational equipment (530,006). It is widely used in the field of credit card anti-counterfeiting and product packaging. It is usually formed on a plastic film with a surface embossed pattern. The back side is coated with an aluminum film, and light is transmitted through the film to reconstruct the image.
2) Reflection holographic projection. Using a white light source, the film is illuminated from the same direction as the viewer, and the color image is reconstructed by reflection. Mirror holographic projections produce three-dimensional images by controlling the motion of the mirror on a two-dimensional surface.
Simple holographic projection equipmentHolographic projections for commercial exhibitions or film and television special effects require complex production techniques and specialized equipment. In order to popularize scientific knowledge to young people and introduce new achievements in cutting-edge technology, teachers can also produce holographic images with stereoscopic effects by using simple equipment around them.
The experimental principle uses four semi-transparent refracting and total reflections of light to reflect the video source files on the screen. Since the video source file has four faces of the front, back, left and right of the image at the same time, the four faces are simultaneously projected to form a holographic effect. The schematic is shown in Figure 1.
Materials and processes that produce single-screen projections (including cell phones, tablets), and various transparent sheets (such as acrylic sheets, plastic sheets, PVC sheets, cell phone films, etc.). Since the quadrilateral vertebral body is the simplest fabrication, the holographic projection process and precautions are detailed below.
1) Determine the geometry and size of the quadrilateral vertebral body. The projection device produced in this experiment consists of a transparent plastic or the like and a single-screen projection source covered with a pyramid (Fig. 2). The light is emitted by the projection source and produces total reflection on the sides of the pyramid, entering the viewer's eyes. If the light reflected by each side can form the different sides of the three-dimensional object, the observer can view the teaching objectives from different directions, and achieve the teaching requirements to meet the teaching requirements. To do this, teachers must comprehensively improve their own quality, strive to master modern information technology, learn to use network resources to enrich and enrich the teaching content; when making courseware, you should try your best to integrate the style that is easy for students to accept. Among them, it not only reflects its own educational philosophy, but also is easy for students to master. At the same time, colleges and universities should strengthen the training of English teachers' courseware production skills, which should make the courseware easy for teachers to make and easy for students to understand.
ConclusionThe trend of globalization of knowledge economy poses new challenges to higher education. To adapt to this new development trend, both teachers who are educators and students who are educated must have practical ability and innovative spirit. Applying multimedia to college English teaching is an effective way to cultivate compound talents that adapt to social development. It has greatly improved the teaching methods of teachers, enabling teachers to get out of heavy teaching activities and use more time and energy to truly achieve students. Comprehensive education. As a modern college English teacher, we should take the initiative to adapt to the development of modern society, skillfully use multimedia technology, create a classroom full of vitality and vitality, cultivate students' innovative spirit and practical ability, and comprehensively enhance the comprehensive application ability of college students in order to compete in the fierce market. Neutral in an invincible position.
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