A bilateral comparison of particle number concentration standards via calibration of an optical particle counter for number concentration up to ∼1000 cm−3

A bilateral comparison of particle number concentration standards via calibration of an optical particle counter for number concentration up to ∼1000 cm−3

Measurement

10.1016/j.measurement.2021.110446

http://dx.doi.org/10.1016/j.measurement.2021.110446

Thomas Y. Wu, Yoshiko Murashima, Hiromu Sakurai, Kenjiro Iida

Instrumentation, aerosol, metrology

12 November 2021

Wu, T. Y., Murashima, Y., Sakurai, H., & Iida, K. (2022). A bilateral comparison of particle number concentration standards via calibration of an optical particle counter for number concentration up to ∼1000 cm−3. Measurement, 189, 110446. https://doi.org/10.1016/j.measurement.2021.110446

The first bilateral comparison of particle number concentration (PNC) standards via calibrating the counting efficiency (CE) of an optical particle counter (OPC) at high concentration of 1000 cm−3 is reported. An OPC (GRIMM 11-D) has been used as the transfer standard between NMC and NMIJ, with its CE being calibrated using monodisperse polystyrene latex (PSL) particles around 0.3 µm by the Faraday Cup Aerosol Electrometers (FCAE) of both metrology institutes. The CE of the OPC has been evaluated for a series of increasing concentrations to determine the highest concentration level which is free from coincidence loss. The OPC was also calibrated at 0.5 µm using an inkjet aerosol generator (IAG) and FCAE to compare its CE at different concentration levels. We have analysed the CE’s stability at decreasing concentration levels from 1228 to 0.5 cm−3 to derive the evidence for the equivalence of CE at different concentration levels. The CE values of the OPC around 0.3 and 0.5 µm measured by two institutes have agreement within 1.5% (normalized error En < 1), which can serve as evidence of the equivalence of the PNC standards of both metrology institutes for concentrations up to 1000 cm−3. The measurement setup, comparison results and uncertainty analysis for the OPC calibration have been presented.

Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0)

There was no specific funding for the research done

https://oar.a-star.edu.sg/communities-collections/articles/19133

0263-2241

National Metrology Centre