Abstract
Abstract A novel asynchronous time‐resolved Fourier transform infrared (FT‐IR) spectrophotometer based on a conventional continuous‐scan interferometer for repetitive phenomenon is introduced. In contrast to the others, this method does not require the synchronization between the signal for time resolving and that for the sampling of the analog‐to‐digital (A/D) converter. The signal‐processing assembly for time‐resolved measurements consists of a pulse generator, a pulse delay circuit, a gate circuit, and a low‐pass filter. This assembly can be attached to any conventional FT‐IR spectrophotometer. Furthermore, the system with the plural assemblies enables to measure a set of time‐resolved spectra with different time delays simultaneously. The time‐resolved spectra do not have any spectral distortion or artifacts, and the multi‐channel system improves the reliability of the data. As for the application, the reorientation process in a ferroelectric liquid crystal induced by the reversal of external electric field has been studied with a time resolution of 0.5 μ s or less.
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