Detection of thermal emission from atmospheric gases by laser heterodyne radiometry |
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| Institution: | 1. National Key Laboratory of Science and Technology on Tunable Laser, Harbin Institute of Technology, Harbin 150001, China;2. Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, USA;1. Post Graduation Program in Health Sciences, Santo Amaro University, Sao Paulo, Brazil;2. ENT Research Laboratory, Otorhinolaryngology -Head and Neck Surgery Department, Federal University of Sao Paulo, Sao Paulo, Brazil |
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| Abstract: | A gaseous component is considered as a self emitting source that can be detected and characterized remotely by its thermal emission spectrum. The required spectrum analyser should have an appropriately narrow bandwidth. For an atmospheric component, with isolated absorption lines, the linewidths are about 0.1 cm−1 or 3 GHz under standard conditions. This leads to the need for a high resolution radiometer. A laser heterodyne radiometer (LHR) has been used to detect the emission of two components (C2H4 and NH3) at 10 μm wavelength under atmospheric pressure. |
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