Nitric oxide (NO) is an important product released by cigarette burning with significantly negative effects to both environment and human health, but it is hard to be measured in-situ in the process of burning. In this paper, we report a tunable diode laser absorption spectroscopy (TDLAS) set-up using a quantum cascade laser emitting at 5.24 $\mu$m to continuously determine the emitted NO mass in cigarette smoke during burning. Wavelength modulation spectroscopy was applied to improve the detection sensitivity and robustness of the measurement system. A simple single-pass gas cell with a volume of 28 cm³ was used to record the absorption spectra, and then the mass of NO was derived based on the measured line strength. Allan variance analysis demonstrated that the limit of detection of system reached 28 ppb over 180 s integration time. Due to the low effective volume, the rise time and the fall time were rapid with 3 s and 6 s, respectively. An adaptive Kalman filter was used to reduce the noise on the concentration measurement. As a result, the measurement precision is improved by a factor of 4.5. For accurate determination the total NO mass, the emissions of mainstream (MS) and sidestream (SS) of a burning cigarette were individually measured at the same continuous flow rate. The recorded results of three types of cigarettes revealed that the NO mass emitted in the MS is correlated with the sampling flow rate, while the NO mass emitted by the same cigarette in the SS is hardly influenced by at different smoke flow rates. And different cigarette types with identical physical dimensions emit approximately equivalent mass of NO. This work provides a promising method for determining the mass of emitted NO and other compositions of cigarettes smoke.

一氧化氮（NO）是香烟燃烧释放的一种重要产品，对环境和人体健康均具有明显的负面影响，但很难在燃烧过程中进行现场测量。在本文中，我们报告了使用在5.24发射的量子级联激光的可调二极管激光吸收光谱（TDLAS）设置。$\mu$m连续确定燃烧过程中香烟烟雾中排放的NO的质量。波长调制光谱法被用于提高检测灵敏度和测量系统的鲁棒性。一个简单的单通道气室，容积为28 cm ³用NO 2记录吸收光谱，然后基于测得的线强度推导NO的质量。艾伦方差分析表明，在180 s的积分时间内，系统的检出限达到了28 ppb。由于有效容积低，上升时间和下降时间分别较快，分别为3 s和6 s。自适应卡尔曼滤波器用于减少浓度测量中的噪声。结果，测量精度提高了4.5倍。为了准确确定总NO含量，在相同的连续流量下分别测量了燃烧着的香烟的主流（MS）和侧流（SS）的排放量。三种香烟的记录结果表明，MS中散发的NO质量与采样流量相关，而同一支香烟中同一根香烟释放的NO的质量几乎不受不同烟气流量的影响。并且具有相同物理尺寸的不同类型的香烟会排放出近似等量的NO。这项工作提供了一种有前途的方法，用于确定排放的NO和香烟烟雾中其他成分的质量。