Open AccessApplication of fiber mode mixer in differential optical absorption spectroscopy
Author(s) -
Fuqi Si,
Jianguo Liu,
Pinhua Xie,
Yujun Zhang,
Ang Li,
Min Qin,
Yujin Li,
Kai Dou,
Suwen Li,
Wenqing Liu
Publication year - 2007
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.56.1825
Subject(s) - differential optical absorption spectroscopy , photomultiplier , optics , detector , materials science , optical fiber , sensitivity (control systems) , spectroscopy , photodiode , noise (video) , absorption (acoustics) , standard deviation , absorption spectroscopy , fiber , optoelectronics , physics , computer science , electronic engineering , statistics , mathematics , artificial intelligence , image (mathematics) , engineering , composite material , quantum mechanics
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.