Development of an all-sky-scanning spectroradiometer with a visible diode array and a near-infrared acousto-optic tunable filter

A sky scanner was developed that collects spectral radiance data over the wavelength range 390-1732 nm by use of two radiometers, the first being a monochromator with a 512-element silicon diode array and the second being a near-infrared acousto-optic tunable filter (AOTF) coupled to an InGaAs detector. The scanner is capable of completing a set of spectral radiance measurements at 146 points in the sky hemisphere in a period of less than 4 min.