Calibration of Condensation Particle Counters for Legislated Vehicle Number Emission Measurements
Calibration of Condensation Particle Counters for Legislated Vehicle Number Emission Measurements
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DOI：
10.1080/02786820903242029
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发表时间：
2009-01-01
影响因子：
5.2
通讯作者：
Krasenbrink, A.
中科院分区：
文献类型：
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作者：
Giechaskiel, B.;Wang, X.;Krasenbrink, A.
轻型车辆排放法规要求对凝聚粒子计数器（CPC）进行校准和验证。在欧洲联盟委员会联合研究中心（JRC，Ispra，意大利）组织了一次讲习班，研究测试气溶胶材料（其化学成分）对CPC校准结果的影响。燃烧气溶胶标准（CAST）23 nm粒子计数效率（计数效率曲线的陡峭部分）被发现是相似的（0.53）重型柴油机颗粒物的那些（0.57），金刚砂油的计数效率或相似（0.53）或更高（0.72），而四十烷（C40H82）颗粒的那些高得多（0.86）。然而，在研讨会后在JRC进行的测试发现，对四十烷颗粒的计数效率要低得多（23 nm处几乎为0），对NaCl的结果也不稳定（23 nm处为0.6或更低），这表明生成方法和对生成的气溶胶进行热处理的重要性。测量问题，包括对静电计或参考CPC校准，多电荷粒子对计数效率的影响，稳定性，重复性，再现性和可比性的CPC和不同制造商的静电计也进行了研究。
Light duty vehicle emissions legislation requires calibration and validation of Condensation Particle Counters (CPCs). A workshop was organized at the European Commission's Joint Research Centre (JRC, Ispra, Italy) to study the effect of test aerosol materials (of their chemical composition) on CPC calibration results. The counting efficiencies of Combustion Aerosol STandard (CAST) particles at 23 nm (steep part of the counting efficiency curve) were found to be similar (0.53) to those of heavy duty diesel engine particles (0.57), the counting efficiencies of Emery oil were either similar (0.53) or higher (0.72), while those of tetracontane (C40H82) particles were much higher (0.86). However, tests performed at JRC after the workshop found much lower counting efficiencies for tetracontane particles (almost 0 at 23 nm) and variable results for NaCl (0.6 or lower for 23 nm) indicating the importance of the generation method and the thermal treatment of the generated aerosol. Measurement issues including calibration against an electrometer or a reference CPC, the effect of multiply charged particles on counting efficiencies, stability, repeatability, reproducibility and comparability of CPCs and electrometers of different manufacturers were also investigated.