Abstract
The calibration of the response of photographic emulsions using rotating step-sectors may lead to erroneous results when intermittent spectrographic light sources are used. These errors arise through partial synchronization between the periodicity of the light pulses and the passage of sector apertures in front of the spectrograph slit. A design for a rotating step-sector which should overcome synchronization possibilities has been conceived and some actual sectors have been tested. This sector essentially consists of a series of stepped apertures randomly spaced about the periphery of a rotating disk. Data are presented to show that the random spacing of the sector apertures eliminates the possibilities of introducing errors through synchronization effects when conventional intermittent discharges are used.
© 1955 Optical Society of America
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