卷烟烟气的快速、 实时分析对于研究卷烟烟气在抽吸过程中的逐口传递规律, 探究吸烟与健康的关系具有十分重要的意义。 为准确分析卷烟烟气中CH4的逐口释放特征, 基于TDLAS技术, 结合改造后的商用单孔道吸烟机, 建立了卷烟烟气在线分析系统。 以装有CH4(体积分数为0.4‰)的集气袋模拟卷烟, 验证了本系统的逐口稳定性, 二次谐波峰值稳定在1.39附近。 利用该系统, 选择中心波长在1653.72 nm的半导体激光器对四种品牌卷烟烟气中的CH4进行了逐口在线分析。 实验结果表明, 卷烟烟气中CH4的含量随着抽吸口数的增加而增加。 烤烟型卷烟的总量和逐口含量均明显大于混合型卷烟, 烤烟型和混合型卷烟分别在400～900和200～600 ppm范围内逐口递增。 同时不同类型烤烟型卷烟烟气中CH4的总量和逐口含量也有差别。 与传统的逐口分析方法相比, 本系统抗干扰能力强, 能够有效避免烟气中其他气体干扰, 并且可在卷烟抽吸间隔完成逐口检测, 无需样品前处理, 大大提高了检测效率。 该技术在卷烟烟气的逐口在线检测方面具有较好应用前景。

Rapid and real-time analysis of cigarette smoke is of great significance to study the puff-by-puff transfer rules in the suction process and to explore the relationship between smoking and health. By combining with the modified commercial smoking machine herein, cigarette smoke online analysis system was established based on the TDLAS technology. The puff-by-puff stability of this system was verified by simulated cigarette composed of a pocket containing CH4 (volume fraction of 0.4), of which the second harmonic peaks are near 1.39. Using this system, the concentration of CH4 in four different kinds of cigarettes was analyzed puff-by-puff by a semiconductor laser, of which center wavelength was at 1 653.72 nm. The results showed that the CH4 concentration of cigarette smoke increased puff-by-puff. CH4 concentration in the flue-cured cigarette is obviously higher than that of blended cigarette by comparing the content of all and puff-by-puff concentration. The puff-by-puff concentration of flue-cured cigarette increased from 400 to 900 ppm, however, the puff-by-puff concentration of blended cigarette increased from 200 to 600 ppm. Simultaneously, there was significant difference between different kinds of the flue-cured. Comparing to traditional analysis methods, this system can effectively avoid the interference of other gases in the smoke cigarette as a result of its strong anti-interference. At the same time, it can finish analysis between suction interval without sample pretreatment. The technology has a good prospect in the on-line puff-by-puff analysis of cigarette smoke.