AUTOMATIC RECORDING OF INFRARED SPECTRA ON PUNCHED CARDS
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Date
1952
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Ohio State University
Abstract
It is desirable to record infrared spectra point by point in digital form on punched cards in order to use automatic machine methods of processing the data, such as calibration, conversion to absorption coefficient, comparison of spectra, subtraction of spectra of an identified constituent from that of an unknown mixture. It also allows the introduction of new methods suggested by communication theory of improving signal-to-noise ratio by smoothing noisy data with correlation functions. The computing machine can be considered as a nonlinear filter, part of the infrared equipment. This is accomplished by attaching a Digital Reader in parallel with the conventional graphical recorder to the output of the detector voltage amplifier. The Digital Reader converts the deflection voltage into a binary code, and operates a Key Punch by which the voltage in digital form is punched in a column of a standard card. The data can then be processed by standard IBM equipment. Examples of various kinds of spectra recorded in digital form on punched cards will be presented, together with some examples of processed data.
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Author Institution: A. D. Little, Inc.