纳秒脉冲激光辐射黑火药的光声信号快速检测方法及分析  

Fast Measurement and Analysis of Photoacoustic Signal of Black Powder Generated by Focused Nanosecond Laser Pulse

作　　者：陈奕如 沈瑞琪[1,2] 吴立志 CHEN Yi-ru;SHEN Rui-qi;WU Li-zhi(School of Chemistry and Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Micro‑Nano Energetic Devices Key Laboratory,Ministry of Industry and Information Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学化学与化工学院,江苏南京210094 [2]微纳含能器件工业和信息化部重点实验室,江苏南京210094

出　　处：《含能材料》2023年第11期1141-1149,共9页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(21275074)。

摘　　要：为深入了解激光与黑火药的相互作用机理,研究采用基于Michelson干涉的相位调制超快光声探测方法,对纳秒脉冲激光作用于硝酸钾、硫磺、石墨以及黑火药表面激发的光声信号进行了检测,分析讨论了光声信号中的物理和化学反应过程信息,建立了光致黑火药反应的速率模型。结果表明:在纳秒激光辐照下,黑火药未发生显著的热化学反应,但是存在其他形式的反应,并且该反应增强了光声信号;黑火药的光声信号强度与激光脉冲能量呈近似线性关系;黑火药的反应速率与激光脉冲能量呈近似正相关,在激光脉冲能量较强时呈下降趋势,当激光脉冲能量为10 mJ左右反应速率达到最大值为20 mmol·s^(-1)。Photoacoustic signals were induced on slices of black powder and its components,which was radiated by 1064 nm la-ser pulses with 10 ns duration.The laser pulse energies were adjusted by regulating the number of fused silica plates on the laser path as attenuators.An optical fiber-based Michelson interferometer was utilized to detect the generated acoustic signals.Acous-tic wave energy was estimated.A primary model was proposed to estimate the reaction rate of black powder.Detected phase changes were similar to each other,but the dimensions varied with laser pulse energy.Thermal reaction of blackpowder was not significant under laser radiation,but other reaction mechanism existed and enhanced the photoacoustic signal.Relationship be-tween laser pulse energy and integration of absolute value of phase change is approximately linear.Reaction rate of black pow-der is positively related to laser energy,except for high-energy pulse.The maximum of reaction rate was about 20 mmol·s^(-1),which was achieved when laser energy is around 10 mJ.

关 键 词：黑火药 激光点火 Michelson干涉法 光声检测 反应速率 

分 类 号：TN249[电子电信—物理电子学] P164[天文地球—天文学]