Temperature-independent hygrometry using micromachined photonic crystal fiber

Zhang, Pan and Yang, Hangzhou and Lim, Kok Sing and Ahmad, Harith and Rong, Qiangzhou and Tian, Qin and Ding, Xiangzi (2018) Temperature-independent hygrometry using micromachined photonic crystal fiber. Applied Optics, 57 (15). p. 4237. ISSN 1559-128X, DOI https://doi.org/10.1364/AO.57.004237.

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Official URL: https://doi.org/10.1364/AO.57.004237


An in-fiber Mach–Zehnder interferometer (MZI) is proposed and experimentally demonstrated for relative humidity (RH) and temperature measurements. The MZI is formed by a grapefruit-shaped photonic crystal fiber (G-PCF) cascaded with a short section of multimode fiber that serves as a mode coupler. To enhance sensitivity to humidity, femtosecond laser micromachining was performed to remove a portion of cladding of the G-PCF to expose its core to the ambient medium. The output interference spectrum is fast Fourier transformed to produce a spatial frequency spectrum that describes the intensity composition of the cladding modes in the MZI. In our investigation, it was observed that the interference dip intensity has a sensitivity of −0.077 dB=% RH to the change of RH in the range of 25%–80% RH, whereas the dip wavelength has a temperature sensitivity of ∼3.3 pm∕°C in the range of 25°C–70°C. In addition, the dip intensity was insensitive to temperature. These characteristics have provided convenience in eliminating temperature cross talk and achieving accurate humidity measurement.

Item Type: Article
Funders: National Natural Science Foundation of China (NSFC) (61077060, 61205080, 61235005, 61327012, 61405160), National High Technology Research and Development Program 863 (2009AA06Z203), Ministry of Education Project of Science and Technology Innovation (Z08119), Ministry of Science and Technology Project of International Cooperation (2008CR1063), Shaanxi Province Project of Science and Technology Innovation (2008ZDGC-14, 2009ZKC01-19), ShaanXi Young Scientist Star Program (2016KJXX-04), Projects of Scientific Research Plan of ShaanXi Education Department (15JK1751), Northwest University (NWU) Young Scientist Support Program (NJ00089), Fellow of the Royal Geographical Society (RGS) (FP002-2013B), University of Malaya (UM) Research Grant (RG326-15AFR)
Uncontrolled Keywords: Atmospheric humidity; Crystal whiskers; Fibers; Fourier series; Multimode fibers; Nonlinear optics; Temperature measurement
Subjects: Q Science > Q Science (General)
Q Science > QC Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 28 Jan 2019 01:11
Last Modified: 28 Jan 2019 01:11
URI: http://eprints.um.edu.my/id/eprint/20170

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