基于离轴集成腔输出光谱自定义动态范围的多气体传感器系统，用于电厂碳排放现场监测

IF 3.4 3区物理与天体物理 Q2 INSTRUMENTS & INSTRUMENTATION

Infrared Physics & Technology Pub Date : 2025-08-23 DOI:10.1016/j.infrared.2025.106103

Jianing Wang , Zhen Li , Pengbo Li , Guanyu Lin , Zhibin Ban , Xiaogang Yan

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引用次数: 0

摘要

为同时检测燃煤电厂排放的甲烷（CH4）、一氧化碳（CO）和二氧化碳（CO2），研制了具有定制动态测量范围的近红外（NIR）多气体传感器。工业气体排放通常包含各种浓度变化很大的气体成分，这就需要同时确保传感器精度、响应时间和成本效益。因此，设计并实现了一种分段镀膜集成腔光机械结构，通过单个集成腔在选定的中心波长内提供定制的吸收光长度。同时，实现了对百分比水平的CO2以及百万分之一（ppm）水平的CH4和CO的高精度线性检测和快速响应。Allan偏差分析表明，在平均时间为1 s的情况下，CH4、CO和CO2的检测灵敏度分别为0.297 ppm、0.336 ppm和0.6%，随着最佳积分时间的增加，检测灵敏度进一步提高。此外，为了准确地实现目标气体组分浓度的时间变化，设计并实现了一种创新的侧通气孔结构。流场优化设计后，回流区明显减少，响应时间降至6.75 s。在电厂进行了现场测量，并进行了实时痕量CH4、CO和CO2，验证了传感器系统的长期稳定性。总体而言，本研究开发的创新腔体结构和光路同时满足了现场应用的实际要求，包括响应时间、多气体检测能力和兼容的检测范围。

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Multi-gas sensor system with customized dynamic ranges based on off-axis integrated cavity output spectroscopic for on-situ monitoring of carbon emissions in power plants

A near-infrared (NIR) multi-gas sensor with customized dynamic measurement ranges has been developed for simultaneous detection of methane (CH4), carbon monoxide (CO) and carbon dioxide (CO₂) discharged from coal-fired power plant. Industrial gas emission commonly contains a variety of gas components with significantly varying concentration, which necessitates a challenge in simultaneously ensuring sensor precision, response time, and cost-effectiveness. Therefore, a segmented coating integrated cavity optomechanical structure was design and implemented to provide customized absorption optical length in the selected central wavelength with single integrated cavity. Simultaneously, high-precision linear detection with rapid response has been achieved for CO₂ at the percentage range level, as well as for CH₄ and CO at the parts per million (ppm) level. Allan deviation analysis indicates that detection sensitivity of 0.297 ppm for CH₄, 0.336 ppm for CO and 0.6 % for CO₂ was achieved with a 1 s average time, which can be further improved with the optimal integration time. In addition, to accurately achieve the temporal concentration changing of target gas components, an innovative side-vented cavity configuration was designed and implemented. With a flow field optimization design, an obvious reduction in recirculation zones decreases the response time to 6.75 s. On-site measurement in power plant was carried out and the real-time trace CH₄, CO and CO₂ were performed to demonstrate the long-term stability of the sensor system. Overall, the innovative cavity structure and optical path developed in this study simultaneously addresses practical requirements in field applications, including response time, multi-gas detection capability, and compatible detection ranges.

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来源期刊

Infrared Physics & Technology 物理-光学

CiteScore

5.70

自引率

12.10%

发文量

400

审稿时长

67 days

期刊介绍： The Journal covers the entire field of infrared physics and technology: theory, experiment, application, devices and instrumentation. Infrared'' is defined as covering the near, mid and far infrared (terahertz) regions from 0.75um (750nm) to 1mm (300GHz.) Submissions in the 300GHz to 100GHz region may be accepted at the editors discretion if their content is relevant to shorter wavelengths. Submissions must be primarily concerned with and directly relevant to this spectral region. Its core topics can be summarized as the generation, propagation and detection, of infrared radiation; the associated optics, materials and devices; and its use in all fields of science, industry, engineering and medicine. Infrared techniques occur in many different fields, notably spectroscopy and interferometry; material characterization and processing; atmospheric physics, astronomy and space research. Scientific aspects include lasers, quantum optics, quantum electronics, image processing and semiconductor physics. Some important applications are medical diagnostics and treatment, industrial inspection and environmental monitoring.