Environmental mid-infrared gas sensing using MEMS FTIR spectrometer

Mazen Erfan; Ahmed A. Elsayed; Yasser M. Sabry; Bassem Mortada; Khaled Sharaf; Diaa Khalil

doi:10.1117/12.2251345

20 February 2017 Environmental mid-infrared gas sensing using MEMS FTIR spectrometer

Mazen Erfan, Ahmed A. Elsayed, Yasser M. Sabry, Bassem Mortada, Khaled Sharaf, Diaa Khalil

Proceedings Volume 10116, MOEMS and Miniaturized Systems XVI; 101160L (2017) https://doi.org/10.1117/12.2251345
Event: SPIE OPTO, 2017, San Francisco, California, United States

Abstract

In this work, we report carbon dioxide gas sensing in the ambient air in the mid-infrared range around 4250 nm using MEMS FTIR spectrometer. The core engine of the spectrometer is a scanning Michelson interferometer fabricated using deep etching technology on silicon-on-insulator wafer. The measured Signal-to-Noise Ratio (SNR) is 24 dB at a wavelength of 4250 nm and the spectral resolution is about 60 cm^-1. A free-space gas cell using CaF₂ lenses with lightgas interaction lengths of 12 cm and 120 cm is demonstrated. The results demonstrate about 400 ppm concentration detection in the ambient air. The theoretical sensitivity limit based on the achieved SNR and resolution is about 15 ppm.

Conference Presentation

Citation Download Citation

Mazen Erfan, Ahmed A. Elsayed, Yasser M. Sabry, Bassem Mortada, Khaled Sharaf, and Diaa Khalil "Environmental mid-infrared gas sensing using MEMS FTIR spectrometer", Proc. SPIE 10116, MOEMS and Miniaturized Systems XVI, 101160L (20 February 2017); https://doi.org/10.1117/12.2251345

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