Study On Laser Blindness And Damage Technology Of Photoelectric Sensors

Since the advent of photoelectric sensors,due to their advantages of high resolution,good sensitivity,and high imaging speed,they have been widely used in various fields,especially in the military field.In recent years,with the continuous development of photoelectric guided weapons and their important position in the military,interference and blinding of photoelectric guided weapons have become an important research direction.This paper studies the technology of laser interference and blinding of photoelectric sensors.The interference and damage effects of laser on photodetectors were studied experimentally.The CCD and CMOS image sensors were irradiated with 1064nm and 532nm lasers.It was found that under 532nm laser irradiation,the saturation power density of the CCD is0.34 W?cm~2,and the damaged power density is 11.2W?cm~2;The saturation power density of the CMOS is 0.07 W?cm~2,and the oversaturated power density is 0.12 W?cm~2,the power density at which point damage occurs is 0.55W?cm~2,and the power density at which line damage occurs is 1.3W?cm~2.In the 1064nm laser irradiation experiments on CMOS,only the saturation phenomenon was observed.The partially saturated power density is1.6 W?cm~2,and the almost fully saturated power density is 3.4 W?cm~2.Compared with1064nm laser irradiation,532nm laser is more likely to cause CMOS damage.The paper also combines the“cat's eye”effect and damage study of the photoelectric sensor.Through experiments,the magnitude of the“cat's eye”effect echo amplitude under the mechanical shutter opening and closing conditions is studied.At a distance of 80m,experimental tests have found that the amplitude of the echo signal of the“cat's eye”effect under the shutter opening condition of the camera is approximately 5 times of the shutter closing condition.The use of this phenomenon in practical applications can be used to determine whether the shutter of the photoelectric sensor is in an open state,so as to select the opportune moment for optoelectronic countermeasures and improve the effect of laser damage.The paper also simulated the long-range laser interference,analyzed the attenuation effect of the laser transmission in the atmosphere,and deduced the formula for the laser power density of the laser reaching the photosensitive surface of the photodetector.Thus,the power necessary for the laser to effectively interfere with or blind the photodetector is estimated,and the power required for the laser to interfere with the photodetector is 71W at a distance of 8km.In addition,the influence of the beam divergence angle,visibility and elevation angle of the laser transmission on the energy required for the laser interference photodetector is analyzed.The paper also developed a high-power laser for long-distance interference and blinding.A quasi-continuous high-power laser was set up on the optical bench.The parameters of the laser were measured and calculated.The experimental data show that the developed when the cavity length is relatively short,the laser has a higher output power;when the duty cycle of the pump power source is relatively large,and it also has a relatively high output power.Based on the developed laser,the relationship between the single pulse energy and the interference distance was also analyzed.It was found that when the single pulse energy was847mJ,the interference distance of the laser to the photodetector was 16km.This data provides an important basis for the further development of engineered practical lasers.