High resolution absorption and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region

Mohammed N. Afsar

doi:10.1117/12.2303339

30 November 2017 High resolution absorption and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region

Mohammed N. Afsar

Author Affiliations +

Proceedings Volume 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994; 22508Y (2017) https://doi.org/10.1117/12.2303339
Event: Millimeter and Submillimeter Waves and Applications: International Conference, 1994, San Diego, CA, United States

Abstract

For quantitative measurement and interpretation of atmospheric pollutant gases one requires to have prior knowledge of the absorption line shape, line position, line strength of individual gas molecules. We have constructed a high resolution millimeter and submillimeter wave dispersive Fourier transform spectrometer to measure transmission, absorption coefficient and refractive index spectra of gas molecules in the laboratory. The spectral resolution is about 0.025 of a wavenumber per centimeter. The dispersive configuration of the interferometer allows the gas to be introduced in one of the active arm of the two beam interferometer to provide phase information in addition to the amplitude information. The complex Fourier transform leads us to measure the real and imaginary part of complex refractive index directly.

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Mohammed N. Afsar "High resolution absorption and refractive index spectra of carbon monoxide gas at millimeter and submillimeter wavelength region", Proc. SPIE 2250, International Conference on Millimeter and Submillimeter Waves and Applications 1994, 22508Y (30 November 2017); https://doi.org/10.1117/12.2303339

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