Performance of a newly designed continuous soot monitoring system (COSMOS).
Performance of a newly designed continuous soot monitoring system (COSMOS).
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DOI：
10.1039/b806957c
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发表时间：
2008-09
期刊：
影响因子：
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通讯作者：
Y. Miyazaki;Y. Kondo;L. Sahu;J. Imaru;N. Fukushima;M. Kano
中科院分区：
文献类型：
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作者：
Y. Miyazaki;Y. Kondo;L. Sahu;J. Imaru;N. Fukushima;M. Kano
我们设计了一套连续烟尘监测系统(COSMOS)，用于全自动、高灵敏度、连续测量黑碳(BC)气溶胶的光吸收。该仪器使用波长为565 nm的LED监测自动推进的石英纤维滤带透过率的变化。为了实现高灵敏度和低可探测光吸收系数的测量，COSMOS使用双凸透镜和光束管来保持高光强，并在1000赫兹获得信号数据。此外，还能主动控制采样流量和光学单元温度。COSMOS的进气管道被加热到400摄氏度，以有效挥发在内部与BC混合的非难熔气溶胶成分。在目前的形式下，COSMOS为BC光吸收测量提供了10分钟的探测下限为0.45 mm(-1)(烟尘为0.045微克m(-3))。单位间的变异性估计在+/-1%以内，表明其具有很高的重复性。COSMOS测定的吸收系数与颗粒烟尘吸收光度计(PSAP)测定的吸收系数在1%以内一致(R2=0.97)。在我们的操作条件下，10min积分数据的精度(+/-0.60 mm(-1))优于PSAP和人口仪。这些结果表明，与现有方法相比，COSMOS在基于滤光片的BC光吸收测量中实现了更高的检测极限和更高的精度。
We designed a continuous soot monitoring system (COSMOS) for fully automated, high-sensitivity, continuous measurement of light absorption by black carbon (BC) aerosols. The instrument monitors changes in transmittance across an automatically advancing quartz fiber filter tape using an LED at a 565 nm wavelength. To achieve measurements with high sensitivity and a lower detectable light absorption coefficient, COSMOS uses a double-convex lens and optical bundle pipes to maintain high light intensity and signal data are obtained at 1000 Hz. In addition, sampling flow rate and optical unit temperature are actively controlled. The inlet line for COSMOS is heated to 400 degrees C to effectively volatilize non-refractory aerosol components that are internally mixed with BC. In its current form, COSMOS provides BC light absorption measurements with a detection limit of 0.45 Mm(-1) (0.045 microg m(-3) for soot) for 10 min. The unit-to-unit variability is estimated to be within +/- 1%, demonstrating its high reproducibility. The absorption coefficients determined by COSMOS agreed with those by a particle soot absorption photometer (PSAP) to within 1% (r2 = 0.97). The precision (+/- 0.60 Mm(-1)) for 10 min integrated data was better than that of PSAP and an aethalometer under our operating conditions. These results showed that COSMOS achieved both an improved detection limit and higher precision for the filter-based light absorption measurements of BC compared to the existing methods.