Acta Optica Sinica, Volume. 33, Issue 2, 230004(2013)
Study of Concentration Retrieving Algorithm for Ammonia Based on Differential Optical Absorption Spectroscopy
The method of differential optical absorption spectroscopy (DOAS) is applied to the retrieval of ammonia concentration. Genetic algorithm, wavelet transform and Kalman filtering are all studied to show the inversion accuracy of low-concentration ammonia based on the traditional DOAS algorithm. The results show that all the three algorithms have good denoise performance for ammonia absorption spectrum with low SNR. In the case of ammonia concentration lower than 7.6 mg/m3, the inversion accuracy for three improved algorithms is obviously improved compared with the traditional algorithm. Standard deviation and peak to peak value of the differential absorbance residuals based on Kalman filtering combining traditional polynomial fitting are 0.1349% and 0.6132%, respectively, which shows the best performace. The measurement error is within ±0.3%.
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Zhu Jin, Sun Dongmei, Chen Ling. Study of Concentration Retrieving Algorithm for Ammonia Based on Differential Optical Absorption Spectroscopy[J]. Acta Optica Sinica, 2013, 33(2): 230004
Category: Spectroscopy
Received: Aug. 23, 2012
Accepted: --
Published Online: Dec. 5, 2012
The Author Email: Jin Zhu (zdh_027@163.com)