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Journal of Nanomaterials
Volume 2017, Article ID 6548380, 6 pages
https://doi.org/10.1155/2017/6548380
Research Article

Theoretical Research on Ellipsoidal Structure Methane Gas Detection Based on Near Infrared Light Sources of PbSe Quantum Dots

1College of Information Engineering, Changchun University, Changchun 130012, China
2College of Automotive Engineering, Jilin University, Changchun 130000, China
3School of Science and Technology, College of Humanities & Sciences, Northeast Normal University, Changchun 130000, China

Correspondence should be addressed to Xiaoxue Xing; moc.621@4818euxoaix

Received 15 March 2016; Accepted 15 January 2017; Published 12 February 2017

Academic Editor: Sergio Bietti

Copyright © 2017 Xiaoxue Xing et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

To improve the precision and sensitivity of the detection in near infrared gas detection system, the selection of light source and design of gas chamber structure are two key links. In this paper, the near infrared (NIR) light sources fabricated with PbSe quantum dots (QDs) and a new gas cell structure using an ellipsoid reflector were designed to test the concentration of methane (CH4). The double wavelengths differential detection method was used in the paper. The signal wavelength is 1.665 μm from the NIR QD-based light source with 5.1 nm PbSe QDs. The reference wavelength is 1.943 μm from the NIR QD-based light source with 6.1 nm PbSe QDs. The experimental results show that the differential gain signal could be enhanced 80 times when the major axis, the focus, and the open length of the ellipsoid reflector are 4.18 cm, 3.98 cm, and 0.36 cm, respectively. The structure will be convenient for the signal amplifying, AD converting, and other process in the latter circuits, and therefore both the detection sensitivity and precision can be improved.