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Proceedings Paper

Study of instrument measurement of carbon monoxide concentration by absorption spectrum
Author(s): Jian-qiang Guo; Li Wang; Zeyong Wang; Jinglong Li
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Paper Abstract

This paper presents the measurement of the carbon monoxide concentration in industry field by scanning absorption spectrum. In the measurement, the frequency of DFB laser is stabilized in the central frequency point of absorption peak in 1.57μm absorption band of carbon monoxide by a control system with a standard CO gas chamber, fiber loop, TEC controlled by MCU and its temperature stability is 0.01°C at long time to stabilize the central frequency. In the process of measurement, at first, the CO absorption spectrum will be determined by a standard gas camber to choose a maximum CO absorption peak in its frequency band and its frequency point will be stabilized. The parameters of the operation frequency and environment will be stored in the NV memory in MCU as next operation condition. The concentration can be calculated in a composite algebra operation by first and second harmonic intensity passed through test gas chamber. It has very high measurement precision and real time. The experiment result is consistent with actual gas concentration. It shows that the measurement scheme is valuable for fast, real-time and efficiency measurement.

Paper Details

Date Published: 31 December 2010
PDF: 10 pages
Proc. SPIE 7544, Sixth International Symposium on Precision Engineering Measurements and Instrumentation, 75444F (31 December 2010); doi: 10.1117/12.885712
Show Author Affiliations
Jian-qiang Guo, Southwest Jiaotong Univ. (China)
Li Wang, Southwest Jiaotong Univ. (China)
Zeyong Wang, Southwest Jiaotong Univ. (China)
Jinglong Li, Southwest Jiaotong Univ. (China)


Published in SPIE Proceedings Vol. 7544:
Sixth International Symposium on Precision Engineering Measurements and Instrumentation
Jiubin Tan; Xianfang Wen, Editor(s)

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