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

Abhinav Sharma; Shangran Xie; Richard Zeltner; Philip St. J. Russell

doi:10.1117/12.2540406

28 August 2019 Continuous counting, sizing and refractive index measurement of airborne particles in hollow-core photonic crystal fibre

Abhinav Sharma, Shangran Xie, Richard Zeltner, Philip St. J. Russell

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 111991A (2019) https://doi.org/10.1117/12.2540406
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

Abstract

Air pollution by particles of aerodynamic diameter less than 2.5 μm (PM_2.5) 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 PM_2.5 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.

Citation Download Citation

Abhinav Sharma, Shangran Xie, Richard Zeltner, and Philip St. J. Russell "Continuous counting, sizing and refractive index measurement of airborne particles in hollow-core photonic crystal fibre", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 111991A (28 August 2019); https://doi.org/10.1117/12.2540406

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