用于高温烟气多组分测量的近红外激光传感器

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

Infrared Physics & Technology Pub Date : 2025-07-26 DOI:10.1016/j.infrared.2025.106040

Jinyi Li , Yuqing Zhang , Keming Wang , Yue Ji , Zuowei Fu , Limei Song

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引用次数: 0

摘要

研制了一种基于可调谐二极管激光吸收光谱的近红外激光气体分析仪，用于燃煤电厂脱硝过程烟气成分的快速、高灵敏度、多组分检测。采用两个分布反馈半导体激光器同时覆盖氨（NH3）、水（H2O）和氯化氢（HCl）的吸收谱线。采用波长调制光谱（WMS）方案，在选定的光谱范围内采用不同的正弦调制幅度，并进行相应的优化。设计了一种双通道数字锁相放大电路，产生用于激光时分复用工作的驱动信号，并对探测器信号进行解调。气体吸收的一谐波（1f）和二谐波（2f）信号同时输出。利用Levenberg-Marquardt算法对测量的WMS-2f/1f信号进行拟合，得到气体浓度。气体取样采用热伴热法，气体测量在523 K高温下的5米径气池中进行。结果表明，NH3、HCl和H2O的测量精度分别为2.24%、2.07%和0.78%，灵敏度分别为0.0318 ppm、0.017 ppm和0.0104%，上升时间分别为17.4 s、11.2 s和6.4 s。我们的激光传感器的性能证明了它在多物种高温烟气排放检测中的应用潜力。

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Near infrared laser sensor for multi-species measurement in high temperature flue gas

A near-infrared (NIR) laser gas analyzer based on tunable diode laser absorption spectroscopy is developed for fast, high-sensitivity and multi-species detection of flue gas components in coal-fired power plant denitrification processes. Two NIR distributed feedback semiconductor lasers are employed to simultaneously cover the absorption lines of ammonia (NH₃), water (H₂O), and hydrogen chloride (HCl). Wavelength modulation spectroscopy (WMS) scheme is used and distinct sinusoidal modulation amplitudes are applied to selected spectral ranges and optimized accordingly. A dual-channel digital lock-in amplifier circuit is designed to generate driving signals for time-division multiplexed operation of the lasers and to demodulate the detector signal. Both first harmonic (1f) and second harmonic (2f) signals of gas absorption are outputted simultaneously. Gas concentrations are obtained by fitting measured WMS-2f/1f signals with simulations using the Levenberg-Marquardt algorithm. Heat tracing is employed in gas sampling, and gas measurements are carried out in a 5-meter-pathlength gas cell that is operated at an elevated temperature of 523 K. Results demonstrate measurement accuracies of 2.24 % (NH₃), 2.07 % (HCl), and 0.78 % (H₂O), measurement sensitivity of 0.0318 ppm, 0.017 ppm, and 0.0104 %, and rise times of 17.4 s, 11.2 s, and 6.4 s, respectively. The performance of our laser sensor demonstrates its potential for applications in multi-species detection of high-temperature flue gas emissions.

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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.