Improvements in signal acquisition and processing for time-resolved step-scan FT-IR spectroscopy

Details Improvements in signal acquisition and processing for time-resolved step-scan FT-IR spectroscopy Improvements in signal acquisition and processing for time-resolved step-scan FT-IR spectroscopy

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..388r&link_type=abstract

The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 388-391 (1

Physics

Condensed Matter

Infrared Spectrometers, Auxiliary Equipment, And Techniques, Signal Processing Electronics, Time-Resolved Optical Spectroscopies And Other Ultrafast Optical Measurements In Condensed Matter

Scientific paper

A broadband amplifier with a short rise time was developed for the acquisition of the time dependent part of the interferogram in time-resolved step-scan measurements. Amplification of this portion of the interferogram by about 40 dB is necessary to digitize signal and noise with adequate amplitude resolution. Therefore, the transient ac-signal from the detector has to be separated from the static dc-signal being larger by a factor of thousand. We describe here a way to avoid the currently used ac-coupling of the signal which is always related to the disadvantage of a low frequency limit for time-dependent signals. Since the recorded interferogram shows distortions caused by nonlinear response of the MCT-detector, especially, when a photoconductive detector is used, we implemented a software nonlinearity correction method proposed by Keens and Simon (1). The effects of the nonlinearity correction on the time-resolved step-scan difference spectra of biological samples are demonstrated.

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