通过固体推进剂火焰的激光信号衰减研究

AN INVESTIGATION ON LASER ATTENUATION THROUGH SOLID PROPELLANT FLAMES

本文讨论波长为 1.0 6 μm的 YAG激光束通过固体推进剂火焰时引起的信号衰减。对固体推进剂药条上方的燃烧火焰和发动机喷出的高速羽焰进行了实验测量。结果表明 ,YAG激光束在穿越推剂火焰后会引起信号衰减 ;不同的推进剂引起的衰减量有很大不同 ;推进剂中铝粉的含量是造成近场羽焰激光信号衰减的主要因素。

Attenuation experiments are introduced with the emphasis on a YAG pulse laser system with wave length of 1 06μm.The experiments include two parts:first,the measurement of laser signal attenuation through the flames above the burning propellant strands in a strand burner in order to compare the relative attenuation characteristics of different propellants;second,the measurement of laser signal attenuation through exhaust plume of a scaling down single chamber dual thrust solid propellant rocket motor in its sustain period.The experiments demonstrate that an obvious difference in the relative attenuation(from 2 6% to 12 7%)exist among the various propellants(DB,PS,HTPB and CMDB propellant)at same measuring conditions;the Al content in propellant formulation is a major factor of the attenuation;and the attenuation of the scaling down motor plume(35 7%)is more severe than at of the propellant strand flame because of the longer path and the higher concentration of particles in the plume.