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Research On High Power Laser Source For Atmospheric CO2Measurement

Posted on:2013-08-13Degree:MasterType:Thesis
Country:ChinaCandidate:J ChengFull Text:PDF
GTID:2248330395985892Subject:Communication and Information System
Abstract/Summary:PDF Full Text Request
In recent decades, science and technology has been in a rapid development as well asthe social progress. At the same time, human activities also bring huge pressure to thenature, the emission of greenhouse and harmful gases makes some related gases in a sharpincreasing situation, especially the increase of carbon dioxide which can have an importantimpact on the global climate. Our country is in a period of rapid economic development,the emission of carbon dioxide increases year by year, we have to face a lot of pressurefrom the standard of carbon emissions made by developed countries. Therefore, theaccurate measurement of the changes of carbon dioxide concentration in the atmospherebecomes a focus study in the main countries.Differential absorption lidar (DIAL) is the main carbon dioxide detection technologynowadays, the advantage of this technology is high output power, strong detection echosignal and little scattering effects by atmosphere. However, the traditional DIAL uses a pairof narrowband laser sources to detect the most sensitive band in the carbon dioxideabsorption spectrum, this can not be able to measure multiple bands in the carbon dioxideabsorption spectrum, in this way, the influence of air pressure, temperature, and otheratmospheric gas composition (such as oxygen) of carbon dioxide concentrationmeasurement can not be eliminated effectively. This paper presents two improved launchmethods, using SLED and the tunable laser as the seed source for launch system, while a Lband fiber amplifier is used to amplify the output power. The two systems cover the mainline of carbon dioxide absorption spectrum and thus can detect multiple bands, it providesa new view for differential absorption lidar and has a certain application prospect.
Keywords/Search Tags:Differential absorption, CO2Measurement, SLED, Tunable Laser, FiberAmplifier
PDF Full Text Request
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