Mobile on-line DOAS trace-gases monitoring system with fiber spectroscopy

Meng Zhu; Wuqi Wen; Xin Ding; Peng Wang; Jianquan Yao

doi:10.1117/12.575033

14 February 2005 Mobile on-line DOAS trace-gases monitoring system with fiber spectroscopy

Meng Zhu, Wuqi Wen, Xin Ding, Peng Wang, Jianquan Yao

Proceedings Volume 5634, Advanced Sensor Systems and Applications II; (2005) https://doi.org/10.1117/12.575033
Event: Photonics Asia, 2004, Beijing, China

Abstract

The article mainly focused on mobile on-line air quality monitoring system. By deeply analyzed DOAS theory, we designed this new air quality monitoring system. It is mobile and may monitoring many pollution sources on-line everyday. The Differential Optical Absorption Spectroscopy (DOAS), based on the work by U. Platt and co-workers, is becoming increasingly popular for environment monitoring. DOAS may measure many trace gases like NO₂, O₃, BrO, NO₃ , and SO₂. It is designed for the measurement of primary and secondary urban air pollutants with high precision and little cross interference. In the DOAS technique, the spectrum of an artificial light source within a given bandwidth is measured after passing through the open atmosphere for between 100 m and 10 km. After removing the emission spectrum of the light source, the remaining differential absorption features are compared with the absorption cross sections of relevant trace gases. This allows both the qualitative and quantitative determination of their concentration in the light path. After deeply research, we design this new system. It uses fiber spectroscopy, and it is mobile. User may monitor many pollution sources in a car. This makes auto-monitoring more easily. Our DOAS system has these merits: New Light Emission-Receiver Unit which united emission,receiver and collimation lenses. New Background Elimination Fiber. And dynamic-feedback self-adapting program. In our experiment by this design idea, we get accurate data.

Citation Download Citation

Meng Zhu, Wuqi Wen, Xin Ding, Peng Wang, and Jianquan Yao "Mobile on-line DOAS trace-gases monitoring system with fiber spectroscopy", Proc. SPIE 5634, Advanced Sensor Systems and Applications II, (14 February 2005); https://doi.org/10.1117/12.575033

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KEYWORDS

Absorption

Signal detection

Gases

Light sources

Spectroscopy

Pollution

Air contamination

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