Effect of Nitrogen dioxide for environmental gas detection using Pulsed Cavity ring down spectroscopy
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2017 by IJETT Journal|
|Year of Publication : 2017|
|Authors : Y. Seetha Mahalakshmi, P. Madhusudana Rao, S. Surendra Babu
|DOI : 10.14445/22315381/IJETT-V45P300|
Y. Seetha Mahalakshmi, P. Madhusudana Rao, S. Surendra Babu "Effect of Nitrogen dioxide for environmental gas detection using Pulsed Cavity ring down spectroscopy", International Journal of Engineering Trends and Technology (IJETT), V45(10),531-533 March 2017. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Global climate awareness is an important prerequisite for the benefit of the living species. A balance of the green house gases would make the terrestrial climate friendly and problem free. In this context ground based spectroscopic measurement of atmospheric gases play a major role .Nitrogen oxides present in the atmosphere react with water leading to acid rains. Atmospheric photo chemistry induces a complicated mechanism between Nitrogen oxides which impact the Ozone abundance. Detection of environmental gases by optical methods have proved to be the fastest and reliable detection techniques and Cavity Ring Down Spectroscopy in particular has proved to meet the requirements of being non invasive , portable, instantaneous and precise without interference with other species. It can detect weak absorptions as well as diluted species. The use of high reflectivity mirrors of the order of 99.99% enables the increase in effective path lengths of the light within the cavity and hence contribute to ultra high sensitivities. The purpose of this paper is to emphasis on Nitrogen Di oxide ,an important green house gas. Theoretical simulations are performed for NO2 at two different wavelengths(447 nm and 532 nm) based on the technique of Cavity ring down spectroscopy(CRDS). The empty cavity ring down time constant ?0 and the concentration dependant ring down time constant ? are obtained through simulations. The analysis is done for increasing cavity lengths from 40 cm to 90 cm at 447 nm and 532 nm. The results have shown that the time constant difference (?0 - ?) increases with gas concentration and is unique at each wavelength due to the dependence on absorption cross-section.
 Laser Spectroscopy for Atmospheric and Environmental
Sensing Marc N. Fiddler, Israel Begashaw, Matthew A.
Mickens, Michael S. Collingwood, Zerihun Assefa, and
Solomon Bililign. Sensors 2009, 9, 10447-10512;
doi:10.3390/s91210447 J. Padhye, V. Firoiu, and D. ]
 GielBerden, Richard Engeln, “Cavity ring down spectroscopy techniques and applications” QD96.A2C384 (2009).
 RokZaplotnik, MarijanBiscan,NiksaKrstulovic, DeanPopovic and Slobod and Milosevic Plasma SourcesSci.Technol,24(2015)054004(14pp)
 J.QuanSpecRadTrans Dan Wang, Renzhi Hu, Pinhua Xie, Jianguo Liu, Wenqing Liu, Min Qin, Liuyi Ling, Yi Zeng, Hao Chen, Xingbiao Xing, Guoliang Zhu, Jun Wu, Jun Duan, Xue Lu, Lanlan Shen 166(2015) 23
 Atmospheric Traces monitoring using Cavity Ring Down Spectroscopy (2003): Thesis Diss_Koch  The HITRAN database can be found at http://www.hitran.com
 Nitrogen Dioxide Detection by use of Photoacoustic Spectroscopy with a High Power Violet-Blue Diode Laser Lei Dong, Xukun Yin, Huadan Zheng, Hongpeng Wu, and Suotang Jia Frank K. Tittel
 Measurement of atmospheric NO2 by pulsed cavity ringdown spectroscopy Hans D. Osthoff, Steven S. Brown, Thomas B. Ryerson, Tara J. Fortin,Brian M. Lerner,Eric J. Williams, Anders Pettersson, Tahllee Baynard, William P. Dube ´,Steven J. Ciciora,and A. R. Ravishankara1, JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 111,D12305, doi:10.1029/2005JD006942, 2006.
Cavity ring down spectroscopy(CRDS), time constant ,parts per billion(ppb),Absorption cross-section, Nitrogen di oxide, Beer-Lamberts law.