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.

Temperature correction method for commercial CCD array spectrometers used in spectral radiometry measurement

“…When temperature effects were not taken into account, the deviation at the 1060 nm approached ±17% or more, relative to that determined at 25°C. According to Salim et al, this spectral range is close to the band edge of the silicon, which is highly temperature sensitive, and the silicon band edge moved to longer wavelengths as increasing temperature [6]. As shown in figure 5, the change in IT/IT0 under different temperature at any wavelength could be fitted as a polynomial function.…”

“…Starks [5] conducted to characterize temperature sensitivity of a typical silicon-detectorbased spectroradiometer, demonstrated the potential errors due to temperature effects, and present a methodology to correct for temperature-induced errors. Salim et al [6] at National Physical Laboratory (NPL) have studied the nontemperature-stablized effect of a photodiode array spectrometer, and obtained good corrected results with low uncertainty of measurements. Widenhorn [7] investigated the activation energy for the dark current of a back-illuminated CCD changes over the temperature range of 222 to 291 K. Kuusk [8] presented the temperature dependence in the dark output of a spectrometer module at several integration times over a range of ambient temperatures, and developed a hybrid model to represent dark output.…”

EUROSPEC: at the interface between remote-sensing and ecosystem CO<sub>2</sub> flux measurements in Europe

“…Similarly, DFOV systems also have associated ad- vantages and disadvantages. Because radiometric measurements are temperature-sensitive (Saber et al, 2011), DFOVs based on two spectrometers are particularly sensitive to temperature. A practical solution is to keep the two sensors at constant temperature, e.g.…”

Stray light correction for diode-array-based spectrometers using a monochromator

“…The nonlinearity performance of the spectrometer has been found to be affected by using different integration times and different source intensities [11]. The impact of these two factors on the values of the spectral stray light distribution function has been studied.…”