Mr. Scott N. Zhang Profile

Scott N. Zhang

Electrical Engineer

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Proceedings Article | 19 May 2012 Paper

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

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

Proceedings Volume 8376, 83760G (2012) https://doi.org/10.1117/12.920825

KEYWORDS: Absorption, Absorption spectroscopy, Carbon dioxide, Sensing systems, Carbon monoxide, Sensors, Carbon sequestration, Photodiodes, Carbon dioxide lasers, Signal detection

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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.

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