High-sensitivity electro-optic CO2 gas sensing based on absorption spectroscopy

Scott N. Zhang; Dorothy Y. Wang; Jianmin Gong; Dian Fan; Bo Dong; Michael Fraser; Anbo Wang

doi:10.1117/12.920825

19 May 2012 High-sensitivity electro-optic CO₂ gas sensing based on absorption spectroscopy

Scott N. Zhang, Dorothy Y. Wang, Jianmin Gong, Dian Fan, Bo Dong, Michael Fraser, Anbo Wang

Proceedings Volume 8376, Photonic Microdevices/Microstructures for Sensing IV; 83760G (2012) https://doi.org/10.1117/12.920825
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

We reported a high-sensitivity CO₂ gas sensing system based on wavelength scanning absorption spectroscopy. A distributed feedback (DFB) laser was used as the light source in the system, whose wavelength was thermally tuned, by a thermoelectric cooler (TEC), to scan around one CO₂ absorption line near 1572nm. Scanning of the absorption line spectrum is performed over a glass CO₂ gas cell, 16.5 cm long with collimated optical fiber connectors. Different concentrations of CO₂ were prepared by a high-precision gas flow control meter and sealed within the gas cell. A self-designed detection and amplification circuit was employed for absorption spectrum detection. The circuit implements background-cancellation with a two tier amplification scheme. By cancelling the high background signal, we can improve the CO₂ sensitivity by about two orders of magnitude compared with commonly used direct detection methods with high background signals. Reducing the high DC signal permits isolated amplification of the absorption line spectrum. Absorption spectra of different CO₂ concentrations were measured, and the results demonstrated sensing capability of 100% to <0.1% concentrations of CO₂. This sensing system is expected to be used in conjunction with a wireless CO₂ sensor network for large area CO₂ monitoring. Given the very lower power consumption of the DFB laser and the detection circuit this sensing system offers a solution for affordable long term CO₂ monitoring for reliable storage in carbon sequestration.

Citation Download Citation

Scott N. Zhang, Dorothy Y. Wang, Jianmin Gong, Dian Fan, Bo Dong, Michael Fraser, and Anbo Wang "High-sensitivity electro-optic CO₂ gas sensing based on absorption spectroscopy", Proc. SPIE 8376, Photonic Microdevices/Microstructures for Sensing IV, 83760G (19 May 2012); https://doi.org/10.1117/12.920825

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KEYWORDS

Absorption

Absorption spectroscopy

Carbon dioxide

Sensing systems

Carbon monoxide

Sensors

Carbon sequestration

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