Application of fiber mode mixer in differential optical absorption spectroscopy
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Published:2007
Issue:3
Volume:56
Page:1825
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ISSN:1000-3290
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Container-title:Acta Physica Sinica
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language:
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Short-container-title:Acta Phys. Sin.
Author:
Si Fu-Qi ,Liu Jian-Guo ,Xie Pin-Hua ,Zhang Yu-Jun ,Li Ang ,Qin Min ,Li Yu-Jin ,Dou Ke ,Li Su-Wen ,Liu Wen-Qing ,
Abstract
Differential optical spectroscopy (DOAS) has become an important method for determination of tropospheric trace gases, using the photomultiplier (PMT) as detector. The use of photodiode array (PDA) detectors enhances DOAS system considerably owing to PDA's higher sensitivity and advantage in multi-channel application. When the PMT is simply replaced by PDA, a difference between lamp spectrum and atmosphere spectrum, as will as unwanted standard deviation of residual noise as much as 1.4×10-3 appears after corrected for the pixel response. A fiber mode mixer, based on fiber disturb mode principle was developed and tested. This new device reduces the standard deviation to 3.4×10-4 in field experiments.
Publisher
Acta Physica Sinica, Chinese Physical Society and Institute of Physics, Chinese Academy of Sciences
Subject
General Physics and Astronomy