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Ultra-rapid-scanning Fourier transform infrared spectrometry

1999; Elsevier BV; Volume: 19; Issue: 1 Linguagem: Inglês

10.1016/s0924-2031(99)00006-5

1873-3697

Peter R. Griffiths, Blayne L. Hirsche, Christopher J. Manning,

Gas Sensing Nanomaterials and Sensors

Several applications of Fourier transform infrared (FT-IR) spectrometry are discussed where both conventional rapid-scanning interferometers and step-scan interferometers are unable to provide the needed information. A new interferometer is described by which it is possible to acquire interferograms with 0.25 cm optical path difference (4 cm−1 spectral resolution) in less than 1 ms. The moving element of this interferometer is a tilted mirror that continuously rotates at a speed of up to 500 Hz. The performance of this spectrometer is demonstrated by examining the spark-initiated combustion of ethane and methane in air. The formation of vibrationally excited CO2 and H2O, with lifetimes approaching 50 ms, was observed.