Improving the Stability of Tunable Diode Laser Sensor for Natural Gas Leakage Monitoring

Abstract:

Tunable diode laser absorption spectroscopy (TDLAS) is a method of using a tunable diode laser scanning one of absorption lines of trace gas, this technique has advantage of high sensitivity, fast response, multi-component and non-contact measurement. We had already developed a TDLAS sensor for monitoring natural gas leakage during the natural gas production and the process of gathering and transportation in the natural gas station, but in the practical application we found that the TDLAS sensor was influenced by visibility changes. In order to overcome this interference and improve sensor stability, we present an automatic control circuit to process photoelectric signal for eliminating interference of visibility changes. Long-term monitoring results show that the concentration of CH₄ are regular and stable during the natural gas production and transmission, therefore the application of the automatic gain circuit improved the stability of the TDLAS sensor.

• Periodical: Advanced Materials Research (Volumes 760-762)
• Pages: 84-87
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.760-762.84
• Online since: September 2013
• Authors: Kun You, Yu Jun Zhang, Li Ming Wang, Hong Bin Li, Ying He
• Keywords: Automatic Gain Circuit, Natural Gas Leakage, Stability, Tunable Diode Laser Absorption Spectroscopy

References

[1] H.I. Schiff (Ed. ): Measurement of Atmospheric Gases, SPIE 1433(1991).

[2] Von Drasek. W, Mulderink. K, Charon. O, Champinot. C, Wehe. S, and Allen. M, Tunable Diode Laser Sensor Characterization for Harsh.

[3] H.I. Schiff, G.I. Mackay, J. Bechara: The use of tunable diode laser absorption spectroscopy for atmospheric measurements, In Chemical.

[4] S. Schfer, M. Mashni, J. Sneider, A. Miklos, P. Hess, H. Pitz, K. -U. Pleban, V. Ebert, Sensitive Detection of Methane with a 1. 65 um Diode Laser by Photo-Acoustic and Absorption spectroscopy, Appl. Phys. B 66, 511-516 , (1998).

DOI: 10.1007/s003400050426

[5] M. Wang, Y. Zhang, J. Liu, W. Liu, R. Kan, T. Wang, D. Chen, J. Chen, X. Wang, H. Xia, and X. Fang, Applications of a tunable diode laser absorption spectrometer in monitoring greenhouse gases, Chin. Opt. Lett. 4, 363-365 (2006).

[6] Dong Chen, Wenqing Liu, Yujun Zhang, Jianguo Liu, Ruifeng Kan, Min Wang, Xi Fang, and Yiben Cui, Fiber-distributed multi-channel open-path H2S sensor based on tunable diode laser absorption spectroscopy, Chin. Opt. Lett. 5, 121-124 (2007).

DOI: 10.1109/icia.2006.305823