Papers by Keyword: Infrared Absorption

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Authors: Lin Chen, Xue Gong Yu, Peng Chen, Xin Gu, Jing Gang Lu, De Ren Yang
Abstract: Silicon wafers with different carbon contents have been characterized by Fourier transform infrared spectroscopy technique. An infrared absorption band at 1207cm-1 can be newly observed in the case of carbon content being above 1.7×1017/cm3, whose intensity increases with an increase of carbon concentration in silicon crystal. More interestingly, the 1207cm-1 band cannot be influenced by the long-time annealing in the temperature range of 450-1250oC, suggesting the high thermal stability of this carbon-related defect, which might be related to the presence of silicon carbide in silicon crystals.
Authors: Hai Rong Wang, Wei Zhang, Di Cen, Min Tian
Abstract: This paper presents a novel system for detecting concentration of the CH4 and CO gases, which exist widely in the coal industry. The system applies micro blazed grating to split the collimated light and may get the infrared absorption light with certain wavelength and bandwidth for the gases detection. The schematic diagram, calculation, signal processing, and setup were described in details. Experimental results indicate that the detection system has the ability to detect methane and carbon monoxide with maximum error of 0.169% and 58.3ppm, stability of 0.76% and 0.22%, respectively.
Authors: Hai Rong Wang, Di Cen, Guang Fei Men, Jian Yun Wang
Abstract: Quick, accurate and reliable detection of mash gas plays an important role in the coal industry. This paper presents a novel method to get the infrared absorption peak wavelength by light splitting using plane blazed grating, instead of using filter conventionally. The principle and setup of producing 3.433μm and 4.65μm wavelength lights for detecting CH4 and CO concentration are described in details. The work provides a simple, but efficient option to the infrared absorption gas detection technology.
Authors: N. Inoue, M. Nakatsu, K. Tanahashi, Hiroshi Yamada-Kaneta, Haruhiko Ono, V.D. Akhmetov, O. Lysytskiy, Hans Richter
Authors: Valentin V. Litvinov, Bengt Gunnar Svensson, L.I. Murin, J. Lennart Lindström, Vladimir P. Markevich
Abstract: Intensities of infrared absorption due to asymmetric stretching vibrations of interstitial oxygen atoms in Ge crystals enriched with 16O and 18O isotopes have been compared with oxygen concentrations determined by means of secondary ion mass spectrometry (SIMS). For Ge samples with oxygen content less than 5⋅1017 cm-3 a good correlation has been found between the values of oxygen concentration and values of absorption coefficient in maximum of the absorption band at 855.6 cm-1 with a proportionality coefficient CO = 0.95.1017 сm-2. It is argued that kinetics of oxygen-related thermal double donor formation and oxygen loss upon heat-treatments of Ge crystals at 350 оС cannot be described properly with the application of calibration coefficient CO = 5.1016 cm-2, which is widely used for the determination of oxygen concentration in Ge crystals.
Authors: R. Ramírez, Roberto González, I. Colera, Yi Chen
Authors: K.M. Itoh, W. Walukiewicz, J.W. Beeman, Eugene E. Haller, Hyun Jung Kim, A.J. Mayur, M.D. Sciacca, A.K. Ramdas, Ryszard Buczko, J.W. Farmer, V.I. Ozhogin
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