Abstract
An automatic recording spectrophotometer for the visible, especially adapted for the study of cathodoluminescent materials, is described. It consists of a demountable light source and an interrupter, a glass monochromator with compensation for the variation of the dispersion with wave-length, a photoelectric electron multiplier, a signal amplifier stabilized by negative feedback, and a motor drive amplifier controlling the deflection of the recording head. The wave-length scale is made linear by the introduction of a spiral cam of appropriate form. The system is distinguished by high sensitivity (usable for sources emitting one millilumen/cm2), high speed ( minutes for a record), linear wave-length scale, high stability and easy adjustment.
© 1939 Optical Society of America
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T. B. Perkins
J. Opt. Soc. Am. 29(6) 226-234 (1939)
W. L. Heaps
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N. C. Beese
J. Opt. Soc. Am. 29(7) 278-282 (1939)