Fourier Transform Infrared Analysis of Gas Composition in Low-Volume Light Bulbs

Abstract

Fourier transform infrared spectroscopy has been used for in situ analysis of HBr, CH3Br, and CO within light bulbs at different stages of burning time. The interference fringes originated in the quartz walls of the bulbs have been eliminated by different methods. The NIPALS procedure yielded higher S/N ratio than the fringe-elimination method applied. The CO and HBr showed time-dependent concentration changes during the burning period. The maximum CO concentration (approximately 6 ppm) was detected after 30-50 s of burning time, and then it practically burned out after 5 h. The HBr concentration increased in the first 3 min of burning, and then its concentration stabilized at a 10-15 ppm level. After 5 s of illumination, the CH3Br concentration became undetectable.

Diffraction-limited mid-infrared microspectroscopy to reveal a micron-thick interfacial water layer signature

“…Other methods employ a partial least-squares method to eliminate interference fringes and noises. 78,99–101…”

“…Other methods employ a partial least-squares method to eliminate interference fringes and noises. 78,[99][100][101] In this study, the same procedure as used by Faggin and Hines was applied, which determines the amplitude and period for every fringe in the absorption spectrum. 78 This procedure first defines sharp and broad absorption features relative to the frequency of the interference fringes.…”

Techniques for Handling and Removal of Spectral Channels in Fourier Transform Synchrotron-Based Spectra

“…Another method of correction by interferogram editing consists of using the central burst to model and remove the side bursts 6 . Hren et al 9 proposed using a partial least-squares algorithm procedure for the removal of fringes and noise 10,11 . Hren et al 9 proposed using a partial least-squares algorithm procedure for the removal of fringes and noise 10,11 .…”

Determination of Carbon Monoxide Concentration and Total Pressure in Gas Cavities in the Silica Glass Body of Light Bulbs by FT-IR Spectrometry

“…FT-IR spectrometryboth extractive and open path methodshas been used to monitor trace gas concentrations in industrial, urban, or indoor environments for approximately two decades (e.g., refs −18). The method has already been successfully applied to determine the gas composition in light bulbs or discharge chambers …”