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Temperature and nonlinearity corrections for a photodiode array spectrometer used in the field

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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.

© 2011 Optical Society of America

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