Research on multi-component gas optical detection system based on conjugated interferometer
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An optical multi-component gas detection system based on the conjugated interferometer (CI) is proposed and experimentally demonstrated. It can realize the concentration detection of mixture gas in the environment. The CI can transform the absorption spectrum of the target gases to a conjugated emission spectrum, when combining the CI with the broadband light source, the spectrum of output light matches well with the absorption spectrum of target gases. The CI design for different target gases can be achieved by replacing the kind of target absorbing gas in the CI filter. Traditional fiber gas sensor system requires multiple light sources for detection when there are several kinds of gases, and this problem has been solved by using the CI filter combined with the broadband light source. The experimental results show that the system can detect the concentration of multi-component gases, which are mixed with C2H2 and NH3. Experimental results also show a good concentration sensing linearity.
KeywordsGas conjugated interference filter gas sensing spectral absorption
This research was supported by the Natural National Science Foundation of China, NSFC (Grant No. 61575149, 61290311), and the Major Project of Hubei Technological Innovation Special Fund (2016AAA008).
- M. Jahjah, R. Lewicki, K. F. Tittle, K. Krzempek, P. Stefanski, S. So, et al., “CW DFB RT diode laser-based sensor for trace-gas detection of ethane using a novel compact multi-pass gas absorption cell,” SPIE, 2013, 112(4): 461–465.Google Scholar
- P. Q. Liu, X. Wang, and C. F. Gmachl, “Single-mode quantum cascade lasers employing asymmetric Mach-Zehnder interferometer type cavities,” Applied Physics Letters, 2012, 101(16): 219–221.Google Scholar
- HITRAN on the Web. Available online: http://hitran.iao.ru (accessed on 1 July 2012).Google Scholar
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