| Autor: |
Gang Zhao, Wei Tan, Mengyuan Jia, Jiajuan Hou, Weiguang Ma, Lei Dong, Lei Zhang, Xiaoxia Feng, Xuechun Wu, Wangbao Yin, Liantuan Xiao, Ove Axner, Suotang Jia |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Předmět: |
|
| Zdroj: |
Sensors, Vol 16, Iss 9, p 1544 (2016) |
| Druh dokumentu: |
article |
| ISSN: |
1424-8220 |
| DOI: |
10.3390/s16091544 |
| Popis: |
A novel, intensity-stabilized, fast-scanned, direct absorption spectroscopy (IS-FS-DAS) instrumentation, based on a distributed feedback (DFB) diode laser, is developed. A fiber-coupled polarization rotator and a fiber-coupled polarizer are used to stabilize the intensity of the laser, which significantly reduces its relative intensity noise (RIN). The influence of white noise is reduced by fast scanning over the spectral feature (at 1 kHz), followed by averaging. By combining these two noise-reducing techniques, it is demonstrated that direct absorption spectroscopy (DAS) can be swiftly performed down to a limit of detection (LOD) (1σ) of 4 × 10−6, which opens up a number of new applications. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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