The spectral analysis of extremely faint transient line profiles is most efficiently carried out if a Fabry-Pérot interferometer is used in conjunction with a photoelectric multichannel spectrometer. In the instrument described the Fabry-Pérot fringe is focused on to an array of concentric annular light guides of equal area, each representing the same increment of wavelength d λ. These light guides are fabricated from optic bundles, each annulus being led to a separate photomultiplier. Construction of the array is described and the completed instrument is evaluated. A spectral profile obtained with the device is compared with that produced by the conventional photographic technique.
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M. Forrest (1967) studied this question.
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