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Improving the signal-to-noise ratio of Faraday cup aerosol electrometer based aerosol instrument calibrations

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Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut373-379
Sivumäärä7
JulkaisuAerosol Science and Technology
Vuosikerta50
Numero4
DOI - pysyväislinkit
TilaJulkaistu - 2 huhtikuuta 2016
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

This study introduces a new bipolar measurement routine for particle number concentration calibrations. In the new routine, singly-charged particles of opposite polarities are measured sequentially with a Faraday cup aerosol electrometer (FCAE). We compared the bipolar routine to the traditional FCAE routine, where particle signal and electrometer offset are measured in turns, by calibrating a single CPC on a wide particle number concentration range (from 1000 to 77,000 cm-3) with both routines. By increasing the signal-to-noise ratio, the bipolar routine decreases the type A uncertainty of the calibration especially at low particle concentrations. In practice, the new routine enables shortening the measurement times by 80% at the lowest particle concentrations which, in practice, corresponds to hours.

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