The OGO-IV ultraviolet airglow spectrometer, which measures the earth's spectrum between 1100 and 3400 Å, consists of an Ebert-Fastie monochromator and two photomultipliers with wide-dynamic range ...

Ultraviolet light-emitting diodes (UV-LEDs) have started replacing ultraviolet lamps. The power of UV-LEDs has greatly improved and the cost has decreased. In this paper, we attempt to understand the ...