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Real‐time sampling electronics for double modulation experiments with Fourier transform infrared spectrometers
Review of Scientific Instruments
A novel synchronous real-time analog sampling method for obtaining the sum and difference interferograms in double modulation Fourier transform infrared absorption experiments is described, and the application of this sampling methodology to polarization-modulation FTIR measurements of thin films at metal surfaces is demonstrated. A quadratic approximation of the b,ackground signal is used to calculate the difference interferogram. The demodulation of a test waveform with the real-time samplingdoi:10.1063/1.1142462 fatcat:jtbdvm2ahzhxbl26y6lj2scnce