Continuous-readout extreme-ultraviolet airglow spectrometer

Physics – Optics

Scientific paper

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Airglow, Extreme Ultraviolet Radiation, Indicating Instruments, Readout, Satellite-Borne Instruments, Ultraviolet Spectrometers, Gratings (Spectra), Holography, Microchannels, Spectral Resolution, Spectral Sensitivity

Scientific paper

A satellite-borne extreme-ultraviolet airglow spectrometer is described covering the 275-1420-A range with 8-A resolution. The spectrometer is of near normal incidence Rowland circle design and employs a holographically ruled concave grating. The detector is a microchannel plate with resistive anode providing a continuous readout of any 650-A ground-commandable subset of the total bandpass. This simultaneous wide spectral coverage results in a factor of 80 increase in sensitivity over a fixed exit slit design of equivalent resolution.

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