An Intrinsically Pressure Insensitive Low Cost Particle Number Diluter Featuring Flow Monitoring

Proceedings

Bergmann, Alexander¹  Bainschab, Markus² 

[1] Author to whom correspondence should be addressed.;Institute of Electronic Sensor Systems, Graz University of Technology, 8010 Graz, Austria

关键词: engine exhaust;    particle number;    dilution;    flow monitoring;   

DOI  :  10.3390/proceedings2130981

学科分类：社会科学、人文和艺术（综合）

来源: mdpi

【 摘 要 】

We present a low cost Particle Number (PN) diluter including mass flow monitoring. The device consists of a commercial hypodermic needle, a High Efficiency Particulate Air (HEPA) filter. and a custom-made flow sensor. The flow sensor is used to monitor the diluter’s performance and enable in-time replacement of the low cost elements used. Neither the sampling flow rate nor the pressure drop drastically change the dilution factor introduced by the presented device. This makes the presented device especially useful for particle number measurements at positions close to the tailpipe of internal combustion engine powered vehicles, where aggravating, fast pressure pulsations complicate correct sampling.

【 授权许可】

CC BY