DIRECT OBSERVATION OF THE DERIVATIVE OF INFRARED SPECTRA WITH APPLICATIONS
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Date
1957
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Publisher
Ohio State University
Abstract
The derivative of an infrared spectrum can be approximated by alternately sampling the spectrum at two adjacent wavelengths with the same detector and amplifying the differential signal. This has been done with a grating spectrometer by inserting a small mirror which was vibrated at 90 cps before the exit slit. A synchronous detector was used to observe both the phase and the amplitude of the signal. Such a technique has advantages for particular applications such as observations of details in line profiles and detection of small percentage absorptions.
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Author Institution: University of Michigan