Attenuation And Applied Calculation Of Smoke To 10.6μm Laser Emission

The mathematical models have been founded to describe the attenuation of 10.6μmlaser emission slopingly transmitted through atmosphere. The attenuation performanceof atmosphere to the laser was quantitatively analyzed. The parameter system toevaluate the performance of smoke to the laser was studied. The principle was set up todetermine the capacity forming smoke of smoke agent. According to Mie scatteringtheory, moisture absorption and sedimentation rules of smoke particles, the optimaldiameter of red phosphorus, graphite and fog oil smokes to interfere 10.6μm laseremission were determined.A set of moveable device to test the attenuation performance of smoke to 10.6μmlaser emission was designed and applied to evaluate many kinds of smoke, especially,the performances of fog oil, graphite and nanometer aerosol were studied. By theexperiment, red phosphorus smoke can effectively attenuate 10.6μm laser emissionwhile graphite smoke has an excellent performance and fog oil smoke has a poorperformance to interfere the laser emission. Smoke vehicle has a great ability togenerate smoke and the extinction coefficient to 10.6μm laser emission is much biggeroutdoors than indoors. Red phosphorus and fog oil smoke combined with nanometeraerosol or superfine graphite may enhance their extinction performance. The extinctioncoefficient of fog oil smoke combined with superfine graphite to 10.6μm laser emissionis enhanced 600% than itself.According the turbulent diffusion theory, some mathematical estimation modelswere established, such as estimation for concentration, size, wastage and otherparameters of smoke diffused by explosion in the air. By the study, the transmission rateof 10.6μm laser emission may be attenuated down to smaller than 1% in large space bythe smoke produced by 23 to 46 RP smoke shells, so that, smoke may be applied toeffectively obscure or disturb 10.6μm laser scouts and weapons.