In this highly developed information society, the means of eavesdropping is also more and more superb, often making people invincible, there are also a variety of countermeasures and equipment on the Network, today we will talk about a new type of eavesdropping laser eavesdropping and laser eavesdropping protective film Why can prevent laser eavesdropping.
Figure 1 Laser eavesdropping protective film
First of all, let's talk about what is laser eavesdropping, the use of laser emission equipment, the invisible laser, into the stolen room of the easy to vibrate objects, for example, cigarette boxes, the sound of conversation will cause the vibration of the cigarette box, thereby causing the vibration of the spot. Through the receiving end, the vibration of the laser spot is received, and the sound of the room is restored with the help of special equipment and software processing.
So why can the laser eavesdropping protective film block laser eavesdropping, which has to start from the principle of laser eavesdropping, the wavelength of the visible light of the human eye is about 380nm-780nm, and the laser eavesdropping emitted by the laser avoids the visible light range, the wavelength is about 780nm-1800nm, the human naked eye is unable to see the light of this band, can only be detected by some special equipment and instruments, as shown in Figure 2 of the wide spectrum high-sensitivity laser multiplier.
Figure 2 Wide spectrum high sensitivity laser multiplier
Figure 3 The laser is hit on a wide spectrum high-sensitivity laser multiplier
Therefore, for the laser protective film, as long as the laser in this range can be prevented, the effect of blocking laser eavesdropping can be achieved. The laser eavesdropping blocking membrane can absorb the laser at a wavelength of 780nm-1800nm, so that the laser cannot enter the room through the glass, nor can it be reflected through the glass, so naturally it is impossible to eavesdrop.
Figure 4 The laser penetrates the uncoated glass and the filmed glass