Baseline-free direct absorption spectroscopy and its application in line intensity measurement of ammonia

A method based on direct absorption spectroscopy (DAS) without baseline fitting procedure, which we called baseline-free DAS (BFDAS), is proposed. The BFDAS utilizes three transmission spectra at different pressures and a simulated absorbance at the smallest pressure to derive the difference of inte...

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Bibliographic Details
Published in:Optics communications 2022-12, Vol.525, p.128848, Article 128848
Main Authors: Long, Jiangxiong, Zhang, Yujun, Shao, Li, You, Kun, He, Ying, Ye, Qing, Sun, Xiaoquan
Format: Article
Language:English
Subjects:
Ammonia
Baseline-free
Direct absorption spectroscopy
Line intensity
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Summary:A method based on direct absorption spectroscopy (DAS) without baseline fitting procedure, which we called baseline-free DAS (BFDAS), is proposed. The BFDAS utilizes three transmission spectra at different pressures and a simulated absorbance at the smallest pressure to derive the difference of integral absorbances at the other two pressures, where gas concentration or line intensity can be obtained. The proposed method is experimentally validated by comparing the line intensities of ammonia measured by conventional DAS and BFDAS, which demonstrates good performance of the BFDAS in broadened or narrowly scanned spectra where baseline fitting is difficult to be implemented. •A novel method based on direct absorption spectroscopy is proposed.•The method retrieves concentration or line intensity without baseline fitting procedure.•Line intensities of ammonia are measured by this method.•The method has good performance for broadened or narrowly scanned spectra.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2022.128848