基于红外特征吸收法的烟草主流烟气中氨浓度检测系统

为了快速、 精确地从卷烟燃烧的主流烟气中求出氨的浓度信息，设计了基于红外吸收的检测系统。根据氨在中红外的特征吸收曲线，系统通过10.4 μm中红外固定波长激光器对准最强吸收峰波长位置。由红外探测阵列获取经被测主流烟气红外光的干涉条纹后，结合光谱数据库及光谱分析算法，由比尔朗伯定律求解主流烟气中的氨浓度。标准光谱数据选自NIST光谱数据库，结合对主流烟气中多种干扰气体的降噪处理，最终完成氨浓度信息的实时显示。实验采用UnicornTM固定波长激光器、 静态傅里叶变换干涉具、 标准抽吸引擎等，对五个不同品牌的卷烟进行测试。每个品牌随机抽取十支，分别采用传统的离子色谱法和本系统进行实验。结果显示，本系统的氨浓度检测与标准值基本一致，同时速度快、 抗干扰能力强。

Ammonia Concentration Detection System for Mainstream Smoke of Tobacco Based on Characteristic Infrared Absorption Method

In order to quickly and accurately determine ammonia concentration from the mainstream smoke of cigarettes burning, a detection system was designed based on characteristic infrared absorption method. According to the characteristics absorption curve of ammonia in the mid-infrared, the system was aligned with the strongest absorption peak of wavelength position by a 10.4 μm infrared fixed wavelength laser. Infrared light irradiated mainstream smoke of cigarettes, and interference fringes were collected by the infrared detector array. Combining spectrum database and spectrum analysis algorithm, the concentration of ammonia was solved by Bill Lambert law for the mainstream smoke. Standard spectrum data was selected from the group consisting of NIST spectrum database, combined with noise reduction processing for interfering gases in a variety of mainstream smoke. Finally, the ammonia concentration information was real-time displayed. Using UnicornTM fixed wavelength lasers, and static Fourier transform interferometer with standard suction engine, experiments tested five different brands of cigarettes for its ammonia concentration in its mainstream smoke. For ten cigarettes randomly selected from each brand, it was detected by ion chromatography and the system in the experiments. The experimental results show that the ammonia concentration of detection system is basically the same as the standard value, meanwhile the system is faster, stronger with anti-interference ability.