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| Research on Aerosol Dilution Method in the Calibration Process of Laser Paticle Counter |
| HUANG Zhi-huang1,LIU Jun-jie2,GUO Kai3 |
1. Fujian Metrology Institute, Fuzhou, Fujian 350003, China
2. National Institute of Metrology, Beijing 100029, China
3. China University of Petroleum, Beijing 102249, China |
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Abstract In order to solve the traceability problem that the laser particle counter can not be implemented by condensation nucleus counter based on direct comparing method, according to the principle of Bernoulli gas flow and the calculation method of aerosol dilution ratio, the dilution process of aerosol is analysed. As the increase of added gas flow,it has a problem that the pressure inside the dilution chamber is not constant. A new method of aerosol dilution to meet the traceability issues of laser particle counter is proposed. The results show that the new method could settle the interference matter of aerosol outlet flow caused by make-up gas, and keep a better uniformity among 0~90 times particles dilution ratio of different diameter in high concentration of aerosol. The max relative error of the measured data and the theoretical calculation is no more than 4.4%.
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Received: 08 October 2014
Published: 31 May 2016
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2016, Vol. 37 
