title: Temperature and nonlinearity corrections for a photodiode array spectrometer used in the field.
abstract: Temperature and nonlinearity effects are two important factors that limit the use of photodiode array spectrometers. Usually the spectrometer is calibrated at a known temperature against a reference source of a particular spectral radiance, and then it is used at different temperatures to measure sources of different spectral radiances. These factors are expected to be problematic for nontemperature-stabilized instruments used for in-the-field experiments, where the radiant power of the site changes continuously with the sun tilt. This paper describes the effect of ambient temperature on a nontemperature-stabilized linear photodiode array spectrometer over the temperature range from 5 °C to 40 °C. The nonlinearity effects on both signal amplification and different levels of radiant power have also been studied and are presented in this paper.
authors.affiliation: National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK. saber.salim@nis.sci.eg
authors.forename: Saber G R
authors.initials: SG
authors.lastname: Salim
authors.forename: Nigel P
authors.initials: NP
authors.lastname: Fox
authors.forename: Evangelos
authors.initials: E
authors.lastname: Theocharous
authors.forename: Tong
authors.initials: T
authors.lastname: Sun
authors.forename: Kenneth T V
authors.initials: KT
authors.lastname: Grattan