Agent-induced excess noise in commercial chemical sensors

Jose L. Solis; Gary Seeton; Laszlo B. Kish

doi:10.1117/12.497153

8 May 2003 Agent-induced excess noise in commercial chemical sensors

Jose L. Solis, Gary Seeton, Laszlo B. Kish

Proceedings Volume 5115, Noise and Information in Nanoelectronics, Sensors, and Standards; (2003) https://doi.org/10.1117/12.497153
Event: SPIE's First International Symposium on Fluctuations and Noise, 2003, Santa Fe, New Mexico, United States

Abstract

The excess noise in commercial semiconductor gas sensors, during exposure to different gases at various temperatures, was studied. The measurements have been carried out using different concentrations of ethanol vapor, CO, NO_x, H₂ and SO₂ gases in synthetic air. The normalized noise spectra of the sensors stabilize after the first day of the burning-in process in synthetic air. The sensors do not show significant deviation from the ohmic behavior over the full range of applied voltage. The induced excess noise is proportional to the square of the applied voltage, so resistance fluctuations explain the spectra. Each gas induces a characteristic noise spectrum. The analysis of resistance fluctuations in gas sensors, during exposure to gases, has the potential of a strongly enhanced sensitivity and selectivity.

Citation Download Citation

Jose L. Solis, Gary Seeton, and Laszlo B. Kish "Agent-induced excess noise in commercial chemical sensors", Proc. SPIE 5115, Noise and Information in Nanoelectronics, Sensors, and Standards, (8 May 2003); https://doi.org/10.1117/12.497153

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