21 February 2018 A novel sensor for detecting PM2.5 concentration based on refractive index sensing of a photonic crystal fiber
Author Affiliations +
Abstract
A novel sensor for detecting particulate matter 2.5 (PM2.5, 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 PM2.5 air flow, the PM2.5 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 PM2.5 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 PM2.5 particles desorbing. The sensor has a good reversibility.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jianchun Yang, Rui Shen, Can Wang, Xueming Li, Yunhong Liu, Ke Xu, Weimin Chen, "A novel sensor for detecting PM2.5 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); doi: 10.1117/12.2299816; https://doi.org/10.1117/12.2299816
PROCEEDINGS
7 PAGES


SHARE
Back to Top