Mr. Tenghui Liu Profile

Tenghui Liu

at Tsinghua Univ

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Proceedings Article | 29 December 2022 Poster + Presentation + Paper

Calibration method for on-line polarization measurement of suspended particles

Tenghui Liu, Nan Zeng

Proceedings Volume 12315, 123151M (2022) https://doi.org/10.1117/12.2644118

KEYWORDS: Calibration, Polarization, Polarized light, Atmospheric particles, Error analysis, Particles, Matrices, Picosecond phenomena, Incident light, Light scattering

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By analyzing their polarization scattering characteristics, the concentration and species of suspended aerosol particles can be monitored and identified. The calibration of polarization measurement system cannot only ensure the measurement accuracy, but also help to establish characteristic polarization spectrum of particle species, and then classify and identify aerosol types. The particle monitoring technique in this paper is Stokes analysis combined with multi-angle scattering measurement method, which contains various error sources of airflow, optical and circuit. We propose a calibration method using ECM (Eigenvalue Calibration Method). The experimental process is divided into two processes: static calibration and dynamic calibration. Static calibration is to calibrate the error of traditional polarization optical system, and the measured error of Stokes vector in this work can be controlled within 0.03. However, for suspended particles flowing through light detection area with airflow, we need a further dynamic calibration to improve the measurement accuracy. Here we use polystyrene spheres with different particle sizes as standard samples. The experimental results show the feasibility of ECM method applied in such online optical analysis for suspended particles.

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