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Temperature and nonlinearity corrections for a photodiode array spectrometer used in the field
Saber G R Salim1, Nigel P Fox, Evangelos Theocharous
1National Physical Laboratory, Hampton Road, Teddington, Middlesex, TW11 0LW, UK. saber.salim@nis.sci.eg
Applied Optics
|February 24, 2011
Summary
Ambient temperature and nonlinearity significantly impact photodiode array spectrometers, especially for field experiments. This study quantifies these effects on a non-temperature-stabilized spectrometer, crucial for accurate spectral radiance measurements.
Area of Science:
- Spectroscopy
- Optical Engineering
- Environmental Monitoring
Background:
- Photodiode array spectrometers face limitations due to temperature fluctuations and nonlinearity.
- These factors are critical for in-the-field measurements where environmental conditions vary.
- Non-temperature-stabilized instruments are particularly susceptible to ambient temperature changes affecting spectral radiance.
Purpose of the Study:
- To investigate the impact of ambient temperature on a non-temperature-stabilized linear photodiode array spectrometer.
- To analyze nonlinearity effects on signal amplification and radiant power measurements.
- To provide data for improving spectrometer calibration and field measurement accuracy.
Main Methods:
- Characterized a linear photodiode array spectrometer over a temperature range of 5°C to 40°C.
- Evaluated nonlinearity effects across various signal amplification and radiant power levels.
- Utilized controlled laboratory conditions to simulate field experiment challenges.
Main Results:
- Quantified the influence of ambient temperature variations on spectrometer performance.
- Demonstrated significant nonlinearity effects impacting measurement accuracy.
- Provided empirical data on the combined effects of temperature and nonlinearity.
Conclusions:
- Ambient temperature and nonlinearity are critical factors affecting photodiode array spectrometer accuracy.
- Non-temperature-stabilized instruments require careful consideration of these effects for reliable field data.
- Findings support the development of more robust calibration strategies for field spectroscopy.
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