Abstract

A rapid scanning spectrometer for oscillographic presentation has been built for use in the “photo-conductive” infra-red region. It is designed to present spectra from 0.36μ to better than 5μ using a PbTe cell. The CO2 doublet at 4.2μ is resolved with a scanning rate of 120 cycles per second and a scanned interval of better than 1.5μ with fluorite optics. A wave-length calibrating device has been incorporated into the instrument; this presents a fiduciary scale, synchronized with the spectrum, on the second beam of the twin-beam cathode-ray oscillograph. Adequate solutions have been found for the problems of synchronizing oscilloscope sweep and scanning drive, and for the problems of amplifier design for the sensitive cells.

© 1950 Optical Society of America

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