基于光声技术研究硝酸钾/石墨的反应性光声谱

Study on the reactivity photoacoustic spectrum of potassium nitrate/graphite powder based on the photoacoustic detection technology

采用动态光声—光电检测技术,研究激光作用下硝酸钾/石墨(KNO3/C)药剂的反应特性,研究表明:在波长1064nm,脉宽54μs的脉冲Nd:YAG激光作用下,激光能量小时可以形成传统的热声波,激光能量大时引起样品的快速化学反应。同一激光能量作用下,不同配比的硝酸钾/石墨样品反应性光声强度不同,KNO3/C=75/25时光声信号最强。同一样品在不同激光能量作用下,反应性光声谱不同,光声强度随激光入射能量的增加而增加,KNO3/C体系的激光诱导过程存在一个最佳的激光点火延滞时间,激光能量低于此值时随着入射激光能量的增大延滞时间增加,高于此值随着激光能量的增大延滞时间缩短。

Using dynamic photoelectric detection technology research of the Reaction Characteristics of laser irradiation potassium nitrate / graphite（ KNO3/ C） .Experimental results showed that： in the 1064ran wavelength, pulse width .54μs pulse Nd： YAG laser,the laser energy is small can be formed conventional thermal acoustic wave, it caused sample rapid chemical reaction when the laser energy is greatex. Under the same laser energy different ratio of potassium nitrate / graphite sample reactivity photoacoustic intensity of different acoustic signal, the ratio of KNO3/C = 75/25 was strongest. The same samples have the reactivity photoacoustic spectrum of different with different laser energy, the greater the laser energy, the stronger the signal, the KNO3/C system has an optimum ignition delay time by the laser induced process. The energy Less than this value as the laser energy increasing delay time increases, above this value as the laser energy increasing delay time shorten.