A novel sensor for detecting PM2.5 concentration based on refractive index sensing of a photonic crystal fiber

Jianchun Yang; Rui Shen; Can Wang; Xueming Li; Yunhong Liu; Ke Xu; Weimin Chen

doi:10.1117/12.2299816

21 February 2018 A novel sensor for detecting PM_2.5 concentration based on refractive index sensing of a photonic crystal fiber

Jianchun Yang, Rui Shen, Can Wang, Xueming Li, Yunhong Liu, Ke Xu, Weimin Chen

Author Affiliations +

Proceedings Volume 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII; 105412K (2018) https://doi.org/10.1117/12.2299816
Event: SPIE OPTO, 2018, San Francisco, California, United States

Abstract

A novel sensor for detecting particulate matter 2.5 (PM_2.5, particles with a diameter smaller than 2.5 μm) concentration in environment air is presented by using modal interference in a photonic crystal fiber (PCF). The sensor is composed of a single mode-multimode-PCF-multimode-single mode optical fiber, and the corresponding polypyrrole (PPy) sensing nanofilm with a light-inducing characteristic is synthesized onto the outside surface of a PCF in-situ by an interfacial ploymerization method. The experimental result shows that the thickness of the sensing film is within the range of 100~150 nm by a scanning electron microscope. When the sensor is placed in PM_2.5 air flow, the PM_2.5 particles are absorbed onto the surface of a PPy sensing film due to a light-inducing electrostatic effect, resulting in the refractive index (RI) change of a sensing film. For PM_2.5 air flow with a concentration of 55 μg/m³ and a sampling time of 30 min, the characteristic wavelength of the interference spectra has a blue shift with 1 nm. After turning off the light source, the characteristic wavelength of the sensor is back to the initial value owing to no light-inducing electrostatic effect and the PM_2.5 particles desorbing. The sensor has a good reversibility.

Citation Download Citation

Jianchun Yang, Rui Shen, Can Wang, Xueming Li, Yunhong Liu, Ke Xu, and Weimin Chen "A novel sensor for detecting PM_2.5 concentration based on refractive index sensing of a photonic crystal fiber", Proc. SPIE 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII, 105412K (21 February 2018); https://doi.org/10.1117/12.2299816

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KEYWORDS

Sensors

Cladding

Single mode fibers

Photonic crystal fibers

Atmospheric particles

Particles

Refractive index

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