The protection system for most interceptor missiles used by the Navy has a reaction time of only milliseconds, and the flight speed of armor-piercing projectiles can reach more than 1700 meters/second, which is much higher than the anti-tank missiles 200-300 meters/second. The reaction time of the system must be increased to at least microseconds.
Laser alarms are mainly divided into two types: spectral identification type and coherent identification type. According to the above introduction, we can draw a concept that the laser pointer alarm device can identify the type of incoming laser, so the laser alarm that works on this principle is called the spectrum identification type. At present, military lasers generally use a limited number of wavelengths. As long as the laser radiation energy of these wavelengths can be detected, it can be determined that the laser has been irradiated. This is the principle on which the spectrum identification laser alarm system is based. Spectral recognition type can be divided into three types according to different working methods: beam interception type, scattering-type, and imaging type.
Beam interception laser warning system relies on directly intercepting the laser beam to achieve detection and alarm. It usually uses several detectors to monitor different directions respectively and has a full range of detection capabilities. This system has a simple structure and low cost, so this is also the most widely used laser warning device. The disadvantage is that the directional resolution is relatively low, generally 15 to 45 degrees.
When the enemy laser beam hits the tank, the detector can receive the signal from the beam and send this signal to the display after processing. Since this laser warning device came out earlier, the so-called display is 9 Eight light-emitting diodes are around and one is at the center of gravity. Each light-emitting diode shows its corresponding 45-degree range; the center one shows that it receives laser radiation from the sky above.
Which of the eight directions lights up tells the driver the general direction of the incoming laser, and at the same time gives an audible alarm that lasts for 2S. Early laser warning systems in Western countries, such as the British Model 451 and 453, the French model TMV518, the German “Oberrich” model, the LAWA model, and the Yugoslav LID model, all belong to this type of green laser pointer alarm Device.
Another working form of the spectrum identification laser warning system is the scattering type. This laser warning system realizes laser detection and warning by receiving laser light scattered from the surface of the armored vehicle itself, the ground, and suspended particles in the atmosphere.