Odd harmonics with wavelength modulation spectroscopy for recovering gas absorbance shape.
In this paper, a new method for recovering gas absorbance shape using wavelength modulation spectroscopy is proposed. We have mathematically proven that the gas absorbance shape can be directly recovered using the data of X and Y components of odd harmonics, regardless of the value of the modulation depth. The transitions of NH(3) near 1531 nm are selected to recover the absorbance shape using numerical simulation and experimental technique. The simulation and experiment results show that our proposed method can simply and accurately recover the gas absorbance shape.
State Key Laboratory of Power Systems, Dept of Thermal Engineering, Tsinghua University, Beijing 100084, China.
Peng
P
Zhimin
Ding
D
Yanjun
Che
C
Lu
Yang
Y
Qiansuo
D003198:Computer Simulation; D005740:Gases / Q000737:chemistry*; D008956:Models, Chemical; D010316:Particle Size; D013057:Spectrum Analysis / Q000379:methods*
D005740:Gases