Measurement of Fourier transform infrared spectrometer instrument lineshape

Nicholas M. Davies; William Bell; A. Vance; Moira Hilton

doi:10.1117/12.332638

15 December 1998 Measurement of Fourier transform infrared spectrometer instrument lineshape

Nicholas M. Davies, William Bell, A. Vance, Moira Hilton

Proceedings Volume 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques; (1998) https://doi.org/10.1117/12.332638
Event: Remote Sensing, 1998, Barcelona, Spain

Abstract

This work describes the use of a He:Ne laser based test rig, developed at NPL, and a low pressure gas cell containing CO to measure the instrument line shape (ILS) function of a Unicam Research Series FTIR spectrometer, which has been extensively used for the detection and measurement of fugitive gas emissions. During the ILS function measurements minor optical misalignments were introduced into the optical system, and their effect on the measured ILS function observed. The ILS functions obtained using the laser system and low pressure gas cell containing CO were in good agreement, both having a full width at half maximum of 0.3 cm^-1. The minor optical misalignments had a significant effect on the ILS function. The initially symmetric function became more asymmetric as the degree of misalignment was increased. Gas concentrations have been retrieved using a symmetric and an asymmetric ILS function, and the differences presented.

Citation Download Citation

Nicholas M. Davies, William Bell, A. Vance, and Moira Hilton "Measurement of Fourier transform infrared spectrometer instrument lineshape", Proc. SPIE 3493, Spectroscopic Atmospheric Environmental Monitoring Techniques, (15 December 1998); https://doi.org/10.1117/12.332638

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