According to media reports, the optical stealth device is a device that uses light characteristics to stealth. It is to make the light around an object slide over the surface of the object, so that the other party can not see the effect of stealth. Using optical stealth has become one of the hot research fields in science. The introduction of some use of changes in the ray path to bypass the object to achieve stealth, Spanish researchers have created a prototype of an acoustic cloak through a 2D mathematical model. The technique for eliminating different sounds is based on the principle of destructive interference. If the two columns of sound waves are completely out of phase, the superposition is zero, and we can't hear the sound. The principle of the acoustic cloak differs in that it uses the waveform characteristics of the sound to bypass the object in front without changing the shape or direction of the sound. The researchers accurately placed 120 cylinders around an object 22.5 cm away, each with a diameter of 15 mm. Through this sophisticated design experiment, the researchers found that the sound waves at a specific frequency maintain the wavefront mode of their original sound source. When this particular sound wave passes through an object, it can "elegantly slide" over the surface of the object, bypassing the object. . The researchers said that a specific cylinder can correspond to sound waves of a specific frequency, so we only need to change the distribution of the cylinder around the object, such as increasing the number of cylinders placed, we can achieve the purpose of stealth for sound waves of another frequency. It is. The researchers speculate that the future application of this technology is very broad. In our real world, by precisely arranging the sound waves of a specific frequency around the front, we can have a better acoustic effect in the urban environment. The combination of stealth technology and optical stealth technology can produce a super cloak that can be both acoustically invisible and optically invisible.
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