Wu Tao, Zhang Xiao, Chen Xiao, Liu Wangwang, Han Yan, Zhong Yubin, Zhao Dan, Fang Zhen, Pan Linxin, Wang Feiyang, Xu Hang
Deep Space Exploration Laboratory, Hefei 230000, China.
National Key Laboratory of Deep Space Exploration, Hefei 230000, China.
Sensors (Basel). 2025 Apr 15;25(8):2478. doi: 10.3390/s25082478.
Wavelength modulation spectroscopy off-axis integrated cavity output spectroscopy (WMS-OA-ICOS) is an in situ detection technique suitable for analyzing trace gases in the atmospheres, characterized by its high sensitivity and ease of integration. However, in current practical applications, the design and optimization of WMS-OA-ICOS systems primarily rely on empirical knowledge, lacking systematic quantitative methodologies. To address this limitation, this study conducts comprehensive modeling and simulation research on WMS-OA-ICOS spectroscopy, proposing a novel modeling approach. The spot distribution simulation results obtained from the self-developed model are validated against those generated using Tracepro. Furthermore, based on the self-developed model, an in-depth investigation is conducted into the effects of cavity length tolerance, beam waist matching, modulation depth, and laser linewidth on signal quality. The findings provide valuable insights for designing and optimizing miniaturized systems with high signal-to-noise ratios.
波长调制光谱离轴积分腔输出光谱（WMS-OA-ICOS）是一种适用于分析大气中痕量气体的原位检测技术，具有高灵敏度和易于集成的特点。然而，在当前实际应用中，WMS-OA-ICOS系统的设计和优化主要依赖经验知识，缺乏系统的定量方法。为解决这一局限性，本研究对WMS-OA-ICOS光谱进行了全面的建模与仿真研究，提出了一种新颖的建模方法。利用自行开发的模型获得的光斑分布模拟结果与使用Tracepro生成的结果进行了验证。此外，基于自行开发的模型，深入研究了腔长公差、束腰匹配、调制深度和激光线宽对信号质量的影响。研究结果为设计和优化高信噪比的小型化系统提供了有价值的见解。
