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Measurement of air pollutants by differential optical absorption spectroscopy using a Cassegrain telescope with fibers |
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| Authors: | Hong-lian Li Yong-jie Wei Yan-xia Hou and Wen-liang Chen |
| Affiliation: | 13039. State Key Laboratory of Precision Measuring Technology and Instruments, Tianjin University, Tianjin, 300072, China 23039. Key Laboratory of Micro-Opto-Electro-Mechanical System Technology, Ministry of Education, Tianjin University, Tianjin, 300072, China 33039. College of Quality & Technical Supervision, Hebei University, Baoding, 071002, China 43039. School of Mechanical Engineering, Hebei University of Technology, Tianjin, 300130, China |
| Abstract: | A differential optical absorption spectroscopy (DOAS) method is presented and used for the air pollutant detection. The novel measurement frame employs a Cassegrain telescope and a combined fiber bundle. The emitting and receiving fibers are bundled together at one port. The common port is placed at the focus of the Cassegrain telescope. The total length of the prototype is reduced to about 1/2 of the traditional one. Air pollutants of SO2, NO2 and O3 are monitored by the prototype, and the concentrations are inverted. Results show that the correlation coefficients are 0.9490, 0.9614 and 0.9301, respectively. And there is a good consistency between the measured results and the reference data. |
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