Preprints
https://doi.org/10.5194/amt-2024-55
https://doi.org/10.5194/amt-2024-55
30 May 2024
 | 30 May 2024
Status: this preprint is currently under review for the journal AMT.

Calibration of Optical Particle Spectrometers Using Mounted Fibres

Jessica Girdwood, Harry Ballington, Chris Stopford, Rob Lewis, and Evelyn Hesse

Abstract. Calibrations of OPSs are non-trivial, and conventionally involve aerosolisation techniques which are challenging for larger particles. In this paper, we present a new technique for OPS calibration, which involves mounting a static fibre within the instrument sample area, measuring the scattering cross section, then comparing it with a calculated value. In addition, we present a case for the use of GLMT simulations to account for deviations in both minor and major axis beam intensity, which has a significant effect on particles which are large compared to the beam waist, in addition to reducing the need for a ‘top-hat’ spacial intensity profile. The described technique is OPS independent and could be applied to a field calibration tool, which could be used to verify the calibration of instruments before they are deployed. In addition to this, the proposed calibration technique would be suited for applications involving mass production of low-cost OPSs.

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Jessica Girdwood, Harry Ballington, Chris Stopford, Rob Lewis, and Evelyn Hesse

Status: open (until 04 Jul 2024)

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Jessica Girdwood, Harry Ballington, Chris Stopford, Rob Lewis, and Evelyn Hesse

Data sets

Fibre Calibration Repository Jessica Girdwood https://github.com/wolkchen-cirrus/FibCalRepo

Jessica Girdwood, Harry Ballington, Chris Stopford, Rob Lewis, and Evelyn Hesse

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Short summary
Optical particle spectrometers (OPSs) are a class of instruments, commonly used for measurement of particle size distributions, which require calibration. Conventionally, this is performed using a known aerosol source, which has reliability issues. In this paper, we present a technique for OPS calibration which involves placing objects in the instrument, which generate a known response. The fibre calibration was more reliable when the technique was compared with a conventional calibration.