Compact Visible And Infrared Spectrometer

New compact spectrometers operate over broad wavelength ranges with moderate spectral resolution. Prototype measures spectral intensity simultaneously at all wavelengths from 3,700 to 11,700 Angstrom, with resolution of 12 Angstrom. Spectrum imaged onto strips on photocathode, then coupled via fiber-optic taper onto charge-coupled-device imager. Suitable for observation of weak phenomena as nocturnal airglow, and for observation of bright auroras and dayglow.