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Miniature Dual-Corona Ionizer for Bipolar Charging of Aerosol

机译：微型双电晕离子发生器的两极充电气溶胶

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摘要

A corona-based bipolar charger has been developed for use in compact, field-portable mobility size spectrometers. The charger employs an aerosol flow cavity exposed to two corona ionizers producing ions of opposite polarity. Each corona ionizer houses two electrodes in parallel needle-mesh configuration and is operated at the same magnitude of corona current. Experimental measurement of detailed charge distribution of near-monodisperse particles of different diameter in the submicrometer size range showed that the charger is capable of producing well-defined, consistent bipolar charge distributions for flow rates up to 1.5 L/min and aerosol concentration up to 107 per cm3. For particles with preexisting charge of +1, 0, and −1, the measured charge distributions agreed well with the theoretical distributions within the range of experimental and theoretical uncertainties. The transmission efficiency of the charger was measured to be 80% for 10 nm particles (at 0.3 L/min and 5 μA corona current) and increased with increasing diameter beyond this size. Measurement of uncharged fractions at various combinations of positive and negative corona currents showed the charger performance to be insensitive to fluctuations in corona current. Ion concentrations under positive and negative unipolar operation were estimated to be 8.2 × 107 and 3.37 × 108 cm−3 for positive and negative ions; the n·t product value under positive corona operation was independently estimated to be 8.5 × 105 s/cm3. The ion concentration estimates indicate the charger to be capable of “neutralizing” typical atmospheric and industrial aerosols in most measurement applications. The miniature size, simple and robust operation makes the charger suitable for portable mobility spectrometers.
机译：已开发出一种基于电晕的双极充电器，可用于紧凑型，现场便携式迁移率尺寸光谱仪。充电器采用暴露于两个电晕离子发生器的气溶胶流动腔，产生相反极性的离子。每个电晕离子发生器均以平行的针状网状结构容纳两个电极，并以相同的电晕电流大小运行。对亚微米尺寸范围内不同直径的近单分散颗粒的详细电荷分布进行的实验测量表明，该充电器能够产生清晰，一致的双极性电荷分布，流速高达1.5 L / min，气溶胶浓度高达10每厘米 3 7 。对于预先存在的+1、0和-1电荷的粒子，在实验和理论不确定性范围内，测得的电荷分布与理论分布非常吻合。对于10 nm的颗粒（在0.3 L / min和5μA电晕电流下），充电器的传输效率经测量为80％，并且随着直径的增大而增加，超过此大小。对正负电晕电流的各种组合下未充电分数的测量表明，充电器的性能对电晕电流的波动不敏感。正负单极操作下的离子浓度估计为正离子和负离子分别为8.2×10 7 和3.37×10 8 cm -3 ;正电晕操作下的n·t乘积值独立估计为8.5×10 5 s / cm 3 。离子浓度估算值表明充电器可以在大多数测量应用中“中和”典型的大气和工业气溶胶。体积小巧，操作简单且坚固耐用，使该充电器适用于便携式移动光谱仪。

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    Chaolong Qi; Pramod Kulkarni;

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  • 年(卷),期 -1(47),1
  • 年度 -1
  • 页码 81–92
  • 总页数 25
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