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首页> 外文会议>Spring Technical Meeting of the Eastern States Section of the Combustion Institute >Tunable Diode Laser Absorption Spectroscopy for CO_2 and H_2O Concentration Measurements in Biomass Combustion Systems
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Tunable Diode Laser Absorption Spectroscopy for CO_2 and H_2O Concentration Measurements in Biomass Combustion Systems

机译：用于生物量燃烧系统的CO_2和H_2O浓度测量的可调谐二极管激光吸收光谱

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摘要

Measurements of biomass combustion products are performed using tunable diode laser absorption spectroscopy. A distributed feedback quantum cascade laser probes transitions in the wavenumber range between 3682 cm~(-1) and 3687.5 cm~(-1). Two infra-red transparent calcium fluoride windows provide optical access to the flue gas, where temperatures range from approximately 100 °F to 700 °F. A 0.75 GHz free spectral range solid germanium etalon is used to obtain a continuous, accurate wavenumber calibration for the entire laser scan range. A calcium fluoride beam splitter directs part of the beam into a test cell for baseline monitoring, where path length, pressure, temperature, and concentration can be fixed. A line-by-line code simulates the absorption spectrum by utilizing the HITRAN database for spectroscopic parameters. Pressure and absorbing path length are held constant, while temperature and concentrations are varied in the simulation input. The best fit simulation gives results for concentrations of probed species. These concentrations of CO_2 and H_2O agree well with data from hand-held gas analyzers as well as theory.
机译：使用可调谐二极管激光吸收光谱进行生物量燃烧产物的测量。分布式反馈量子级联激光探头在3682cm〜（-1）和3687.5cm〜（-1）之间的波数范围内的转变。两个红外透明氟化钙窗口提供对烟道气的光学接入，其中温度范围为约100°F至700°F。 0.75GHz自由谱范围固体锗标准杆用于为整个激光扫描范围获得连续的精确波数校准。氟化钙分子分离器将部分梁引导到用于基线监测的测试电池中，其中路径长度，压力，温度和浓度可以是固定的。逐行码通过利用HITRAN数据库进行光谱参数来模拟吸收光谱。压力和吸收路径长度保持恒定，而温度和浓度在模拟输入中变化。最佳的拟合模拟为探测物种的浓度提供了结果。这些浓度的CO_2和H_2O与来自手持式天然气分析仪的数据以及理论吻合良好。

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