A description is given of the design principles, structure, and use of the PEPSIOS (trade mark) spectrometer, a versatile, easily portable, purely interferometric, high resolution short-range scanning instrument consisting essentially of an interference filter and several simultaneously pressure-swept Fabry–Perot etalons in series. In the study of a continuum, where it was necessary to isolate a single order, it has exhibited a luminosity 102 as great as that of a comparable modern grating-etalon combination instrument at the same resolution and is considerably lighter, smaller, and mechanically more stable. Although designed primarily for the photoelectric measurement of the total flux through an axial zone, the instrument has the property of producing a two-dimensional spatially resolved image at high spectroscopic resolution.
© 1963 Optical Society of America
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