REAL-TIME SAMPLING ELECTRONICS FOR DOUBLE MODULATION EXPERIMENTS WITH FOURIER-TRANSFORM INFRARED SPECTROMETERS

被引:125
作者
GREEN, MJ [1 ]
BARNER, BJ [1 ]
CORN, RM [1 ]
机构
[1] UNIV WISCONSIN,DEPT CHEM,1101 UNIV AVE,MADISON,WI 53706
关键词
D O I
10.1063/1.1142462
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
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 background signal is used to calculate the difference interferogram. The demodulation of a test waveform with the real-time sampling electronics reveals how the bandwidth limitations of previous double modulation experiments on FTIR interferometers that employed lock-in amplifiers have been eliminated.
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页码:1426 / 1430
页数:5
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