Abstract

A description is given of a long-focus all-reflecting spectrometer of the Pfund type which has been designed and constructed at the McMath-Hulbert Observatory for initial application to the infra-red solar spectrum. The detectors employed thus far are two Cashman cells that permit the recording of the solar spectrum between 1.0μ and 3.6μ with high resolution. The amplifier was designed and constructed by W. Wilson. Radiation from overlapping orders is effectively eliminated by a pre-dispersing unit. Two plane reflection gratings, ruled 600 lines/mm and 200 lines/mm, are used for the regions 1.0μ–2.5μ and 2.5μ–3.6μ respectively. Observed line separations indicate that approximately 80 percent of the theoretical resolving power has been attained.

© 1949 Optical Society of America

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