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首页> 外文会议>US Combustion Meeting; 20070325-28; San Diego,CA(US) >Application of a Diode-Laser-Based Ultraviolet Absorption Sensor for in situ Measurements of Atomic Mercury in Coal Combustion Exhaust
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Application of a Diode-Laser-Based Ultraviolet Absorption Sensor for in situ Measurements of Atomic Mercury in Coal Combustion Exhaust

机译：基于二极管激光的紫外吸收传感器在燃煤尾气中原子汞原位测量中的应用

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摘要

A diode-laser-based ultraviolet absorption sensor was successfully demonstrated for both in situ and extractive sampling atomic mercury measurements in a laboratory scale 30 kWt coal combustor at Texas A&M University. Diode-laser-based sensor measurements were compared to measurements from a commercial mercury analyzer. A 375-nm single-mode laser and a 784-nm distributed feedback (DFB) laser are sum-frequency mixed in a non-linear beta-barium borate crystal to generate a 254-nm beam. By tuning the frequency of the DFB laser, the ultraviolet beam is tuned across the transition frequency of mercury at 253.7-nm, leaving an off-resonant baseline on either side. No pretreatment is required for either the in situ or extractive sampling configurations; the effects of broadband absorption can be effectively eliminated during data analysis. Extractive sampling was demonstrated to improve the detection limit of the sensor and to demonstrate the feasibility of total mercury concentration measurements in the future through extractive sampling. Significant variation in the atomic mercury concentration of coal-combustion exhaust was observed over short time periods during our in situ measurements. The sensor detection limits for in situ and extractive sampling are 0.3 and 0.1 parts per billion over a one meter path length, respectively.
机译：德州农工大学在实验室规模的30 kWt煤燃烧器中成功地证明了基于二极管激光的紫外线吸收传感器可用于原位和萃取采样原子汞测量。将基于二极管激光的传感器测量结果与来自商用汞分析仪的测量结果进行了比较。将375 nm单模激光器和784 nm分布式反馈（DFB）激光器以和频方式混合在非线性β-钡硼酸盐晶体中，以产生254 nm光束。通过调节DFB激光器的频率，可以在253.7 nm的水银跃迁频率范围内调谐紫外线，从而在任一侧都留下非共振基线。原位或提取采样配置均不需要预处理；在数据分析过程中可以有效消除宽带吸收的影响。萃取采样被证明可以提高传感器的检出限，并通过萃取采样证明未来进行总汞浓度测量的可行性。在我们的现场测量中，在短时间内观察到了燃煤废气中原子汞浓度的显着变化。在一米的路径长度上，原位和提取采样的传感器检测极限分别为十亿分之0.3和0.1十亿分之十。

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