Abstract

The instrumentation associated with the 100-foot absorption cell of the Johns Hopkins University has been completely redesigned in order to make direct ratio-recording with good accuracy and improved resolution possible in the near (1 μ–25 μ) and intermediate (25 μ–50 μ) infrared spectral regions. In this new system the sample beam flux Fs transmitted through the absorption cell is automatically compared with the flux Fr in a by-passed reference beam and the instrumental comparison response, suitably corrected, is recorded as percent transmission. The new instrumentation includes a Czerny-Turner type grating spectrometer with which it is possible to record successive long path transmission spectra agreeing to about 2% and having a resolution of about 4 cm−1 at 30 microns.

© 1957 Optical Society of America

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