基于TDLAS技术测量卷烟燃吸逐口耗氧量

摘要

In order to detect the oxygen consumption during cigarette smoking, a detection system was developed by incorporating tunable diode laser absorption spectroscopy (TDLAS) technology coupled with a modified single port smoking machine. The results showed that within the oxygen concentration range of 2%-30%, the peak value of its secondary harmonic signal intensity presented good linearity (R2=0.999 1). The system showed higher detection precision (<3%) and less affected by temperature, the puff-by-puff detection sensitivity was of 0.004 a.u/(0.058%); intra-day RSD (0.145%) and inter-day RSD (0.26%) were smaller. The puff-by-puff oxygen consumption of reference cigarette (3R4F) was determined, the results indicated that the oxygen consumption during smoking positively correlated to puff number. The developed detection system features simple structure, short detection time and high time resolution, and has good application prospects for researching cigarette's combustion state and its relationships with cigarette smoke.%为了检测卷烟燃吸过程中的耗氧量,采用可调谐激光二极管吸收光谱(TDLAS)技术,结合改造后的单孔道吸烟机,建立了卷烟燃吸过程耗氧量的检测系统与方法.结果表明:氧气浓度在2%~30%(体积分数)范围内与其二次谐波信号峰值的线性较好(R2=0.9991),温度对系统检测精度影响很小,检测精确度(<3%)较高,逐口检测灵敏度[0.004 a.u/(0.058%)]、日内(RSD:0.145%)及日间(RSD:0.26%)稳定性均较好.以参比卷烟3R4F为样品进行耗氧量的逐口检测,可知卷烟燃吸耗氧量和抽吸口数正相关.该检测系统具有结构简单、检测速度快、时间分辨率高等优势,在研究卷烟燃烧状态及燃烧状态与卷烟烟气间的关系领域具有较好的应用前景.