NO2 detection based on laser spectrum differential method
-
Corresponding author:
GAO Zhihui, gaozhh@szu.edu.cn
;
-
Received Date:
2013-12-03
Accepted Date:
2013-12-20
-
Abstract
In order to analyze the relationship between spectra and gas volume fractions of NO2 which is one of the main pollution gases, laser whose center wavelength was located in the peak of NO2 absorption was chosen as light source and a gas spectra detection system was built. The spectrum was analyzed according to Lambert-Beer law, using time-sharing differential method, comparing with authoritative database and considering the spectral area and other factors. The data were fitted by the least squares method and the relationship curve between NO2 absorption spectra and NO2 volume fractions was obtained. The data of volume fractions was inversed and the error was analyzed. The experimental results agree well with the theoretical analysis. The research value and the application value of the experimental system are verified.
-
-
References
|
[1]
|
RYERSON T B, WILLIAMS E J, FEHSENFELD F C. An efficient photolysis system for fast-response NO2 measurements [J]. Journal of Geophysical Research, 2000, 105(16): 26447-26461. |
|
[2]
|
BROWN S S. Absorption spectroscopy in high-finesse cavities for atmospheric studies [J]. Chemical Reviews, 2003, 103(12): 5219-5238. |
|
[3]
|
KERN C, TRICK S, RIPPEL B, et al. Applicability of light-emitting diodes as light sources for active differential optical absorption spectroscopy measurements [J]. Applied Optics, 2006, 45(9): 2077-2088. |
|
[4]
|
VOIGT S, ORPHAL J, BURROWS P. The temperature and pressure dependence of the absorption cross-sections of NO2 in the 250~800nm region measured by Fourier-transform spectroscopy [J]. Journal of Photochemistry and Photobiology, 2002, A149(1/3):1-7. |
|
[5]
|
CHEN H, ZHOU F X, XU Z, et al. An integrated control system for carbon monoxide detection, emission and recycling [J]. Laser Technology, 2011, 35(3): 360-363(in Chinese). |
|
[6]
|
SUN X P, ZHANG X H, WANG D C, et al. LED illuminant-based detection of trace NO2 gases [J]. Spectroscopy and Spectral Analysis, 2009, 29(6): 1672-1674(in Chinese). |
|
[7]
|
ZHANG G Y, MA J Y, JIN Y D. Investigation on internal energy transfer and relaxation kinetics of NO2 by photo acoustic and fluorescence emission spectra [J]. Spectroscopy and Spectral Analysis, 2011, 31(3): 742-745(in Chinese). |
|
[8]
|
CHEN Z C, GAO Zh H, CAO Zh, et al. Research of CO2 gas concentration detection system based on infrared LED[J]. Laser Infrared,2012, 42(11): 1255-1258(in Chinese). |
|
[9]
|
YANG Y, GAO Z H, ZHONG D H, et al. Detection of nitrogen dioxide using an external modulation diode laser [J]. Applied Optics, 2013, 52(13): 3027-3030. |
|
[10]
|
YANG Y, GAO Zh H, CAO Zh, et al. Detection of the NO2 based on laser spectrum[J]. Laser Technology, 2012, 36(2): 198-199(in Chinese). |
-
-
Proportional views
-
Map
DownLoad: