Theoretical Research on Ellipsoidal Structure Methane Gas Detection Based on Near Infrared Light Sources of PbSe Quantum Dots. (12th February 2017)

• Record Type: Journal Article
• Authors: Xing, Xiaoxue; Lei, Yanmin; Shang, Weiwei; Du, Limin; Guo, Pan
• Other Names: Bietti Sergio Academic Editor.
• Is Part Of: Journal of nanomaterials. Volume 2017(2017)
• Publication Date: 2017-02-12
• Subjects: Nanostructured materials -- Periodicals; Nanotechnology -- Periodicals; Nanomatériaux; Nanostructured materials; Nanotechnology; Nanostructures; Nanotechnology; Periodicals; Fulltext; Internet Resources; Periodicals; 620.115
• DOI: 10.1155/2017/6548380
• Languages: English
• ISSNs: 1687-4110

Abstract

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 μ m from the NIR QD-based light source with 5.1 nm PbSe QDs. The reference wavelength is 1.943 μ m 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.