氮氧化物在环境污染治理、人体健康评估、燃烧及等离子体放电机理研究等领域扮演着越来越重要的角色，发展痕量气体组分浓度高精度实时检测技术意义重大。目前，单一浓度检测手段难以满足多种工况的宽量程测量需求，多光谱融合成为传统测量技术革新的新思路。本文围绕化学发光、吸收光谱检测技术及其应用展开研究，取得的主要工作成果如下：

（1）理论分析并实验探究了化学发光法（CL）测量精度的主要影响因素。针对流量波动及等离子体产物干扰两个关键问题，提出了微纳米尺寸毛细管限流及脉冲型等离子体制备臭氧的解决对策。同时，通过合理选取并优化关键实验参数，设计了一套探测下限约为25 ppt（积分时间为285 s）的NO_x高灵敏度测量系统，并借助实验手段探究了测量系统线性度及灵敏度等关键性能参数，为亚ppb量级NO_x组分的高精度测量提供了重要检测手段。

（2）针对传统直接吸收法（DAS）在气体浓度测量时的精度不足问题，引入融合可调谐二极管激光吸收光谱（Tunable Diode Laser Absorption Spectroscopy，TDLAS）中直接吸收和波长调制优点的WM‑DAS法及高精度分子线型模型，搭建了一套中红外量子级联吸收光谱长光程Herriott池测量系统，实现了目标分子谱线碰撞展宽、线强度等参数高精度标定以及17 ppb‑10⁴ ppm范围内NO_x的精准测量。

（3）基于上述研究，设计了一套融合化学发光/激光光谱的氮氧化物高精度在线检测系统，利用激光吸收光谱法定量测量优点对化学发光法进行标定和校准，克服了传统标气标定方式带来的系统误差和繁琐的操作流程，实现了25 ppt‑10⁴ ppm浓度范围内NO_x宽量程免标定检测，为多种复杂工况环境下氮氧化物精确测量提供新的策略。

（4）利用建立的光谱融合测量技术对空气源脉冲型等离子体放电产物中的关键气体组分浓度（氮氧化物和臭氧）进行了同步检测，揭示了放电物理参数（放电电压、脉宽、频率）和气体物理参数（湿度）对稳定放电状态下产物组分浓度的影响规律，为空气源脉冲型介质阻挡放电等离子体放电特性研究提供了关键实验数据。

The concentration of nitrogen oxides plays an increasingly important role in fields such as environmental pollution control, human health assessment, combustion, and plasma discharge mechanism research, making the development of high-precision, real-time detection technologies of significant importance. Currently, a single measurement approach struggles to meet the requirements of a wide measurement range, and a multispectral fusion strategy has emerged as a new idea for technological innovation. This paper focuses on research related to chemiluminescence and absorption spectroscopy detection technologies and their applications, with the main achievements as follows:

(1) Theoretical analysis and experimental investigation were conducted on the main factors affecting the measurement accuracy of chemiluminescence (CL). To address two critical issues, namely flow fluctuation and interference from plasma products, solutions such as micro-nano scale capillary restriction and the preparation of ozone using pulsed plasma were proposed. Additionally, a high sensitivity measurement system for NO, capable of detecting as low as 25 parts per trillion (over an integration time of 285 seconds) was independently designed through rational selection and optimization of other experimental parameters, providing necessary diagnostic tools for high-precision measurement of NO components at ppb levels.

(2) In response to the insufficient accuracy of the traditional Direct Absorption Spectroscopy (DAS) in measuring gas concentrations, this paper introduces the WM-DAS method along with high-precision molecular line shapes, combined with a long optical path Herriott cell, to construct a mid-infrared Quantum Cascade Absorption Spectroscopy measurement system. By integrating the Herriott cell with a single-pass cell for joint measurements, an absolute measurement of NO components ranging from 17 ppb to several thousand ppm was achieved. Furthermore, utilizing the aforementioned measurement system, the line shape parameters of the high-precision spectral line model for N₂O molecules (Rautian and qSDVP) were calibrated.

(3) Based on the two spectral measurement techniques mentioned above, a high-precision online detection system for nitrogen oxides integrating spectral fusion was designed. By substituting the absorption spectroscopy method for the traditional standard gas calibration approach in the chemiluminescence system, a calibration-free high-precision measurement of NO components within the concentration range of 25 ppt to several thousand ppm was achieved. Combined with the verification of typical operational conditions, the advantages of the spectral fusion measurement system in terms of measurement range, accuracy, and operability were validated.

(4) Utilizing the aforementioned spectral fusion measurement technology, multi-component synchronous diagnostics of key gas concentrations (nitrogen oxides and ozone) in the products of air-source pulsed plasma discharge were conducted. This revealed the influence of discharge physical parameters (discharge voltage, pulse width, frequency) and gas physical parameters (humidity) on the product concentrations under a stable discharge state, providing important experimental data for plasma mechanism research.