Continuous counting, sizing and refractive index measurement of airborne particles in hollow-core photonic crystal fibre

Sharma A, Xie S, Zeltner R, Russell PSJ (2019)

Publication Type: Conference contribution

Publication year: 2019

Journal

Proceedings of SPIE Society of Photo-optical Instrumentation Engineers (SPIE)

Publisher: SPIE

Book Volume: 11199

Conference Proceedings Title: Proceedings of SPIE - The International Society for Optical Engineering

Event location: Limassol CY

ISBN: 9781510631236

DOI: 10.1117/12.2540406

Abstract

Air pollution by particles of aerodynamic diameter less than 2.5 μm (PM2.5) is currently an important environmental issue. As standard methods for monitoring and characterization are time-consuming and expensive, there is need for a simple, effective and inexpensive device for real-Time PM2.5 monitoring. Although optical methods based on the scattering of laser beams exist, they do not provide independent measurement of particle size and refractive index. In systems based on detection in an evanescent optical field, particles tend to adhere to the surface, strongly limiting the device lifetime. Here we report a new approach to airborne particle characterization that makes use of hollow-core photonic crystal fibre (HC-PCF). Employing optical gradient and radiation forces to trap and propel airborne particles along the hollow core, it provides in situ particle counting, sizing and refractive index measurement in real-Time with effectively unlimited device lifetime. We show that the transmission drop and time-of-flight can be unambiguously mapped to particle size and refractive index.

Authors with CRIS profile

Abhinav Sharma Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur) Philip St. John Russell Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE)

How to cite

APA:

Sharma, A., Xie, S., Zeltner, R., & Russell, P.S.J. (2019). Continuous counting, sizing and refractive index measurement of airborne particles in hollow-core photonic crystal fibre. In Kyriacos Kalli, Gilberto Brambilla, Sinead O'Keeffe (Eds.), Proceedings of SPIE - The International Society for Optical Engineering. Limassol, CY: SPIE.

MLA:

Sharma, Abhinav, et al. "Continuous counting, sizing and refractive index measurement of airborne particles in hollow-core photonic crystal fibre." Proceedings of the 7th European Workshop on Optical Fibre Sensors, EWOFS 2019, Limassol Ed. Kyriacos Kalli, Gilberto Brambilla, Sinead O'Keeffe, SPIE, 2019.

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