Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 207, Issue -, Pages 477-480Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2014.10.013
Keywords
Long-period fiber grating; Modal transition; Overlay thickness; Methane sensor; Cryptophanes
Funding
- National Natural Science Foundation of China [61271059, 51304260]
- Science and Technology Development Project of Chongqing [CSTC2012gg-yyjs90007]
- Fundamental Research Funds for the Central Universities [CDJZR14225502]
- Chongqing Municipal Education Commission [KJ130808]
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A highly sensitivity long-period fiber grating (LPFG) methane sensor system is presented, which was working in transition mode with high refractive index overlay deposition of polycarbonate/cryptophane A. The transparent composition coating of polycarbonate/cryptophane A was used as high refractive index overlay deposition based on automatically dip-coating technique to tune the working point of the sensorin the transition region. Effects of overlay thickness and refractive index (RI) on the LPFG's resonant wavelength were studied in order to obtain the optimal overlay thickness. For the overlay thickness of 530 nm, the overlay RI of 1.5605 and the grating period of 520 mu m, the maximal RI sensitivity of the designed LPFG sensor could reach 3.56 x 10(3)nm/RIU. The experimental results demonstrate that the new sensor has the features of high sensitivity (similar to 2.5nm%(-1)) and low detection limit of 0.2% (v/v). (C) 2014 Elsevier B. V. All rights reserved.
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