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Spectroradiometric calibration and temperature sensitivity analysis of a fluorescence box
Applied Optics
|September 22, 2025
Summary
The fluorescence box (FloX) instrument shows significant radiometric shifts with temperature changes. These findings are crucial for ensuring accurate sun-induced chlorophyll fluorescence (SIF) measurements for satellite validation.
Area of Science:
- Earth and Space Sciences
- Spectroscopy
- Instrument Calibration
Background:
- The fluorescence box (FloX) is a hyperspectral instrument for unattended sun-induced chlorophyll fluorescence (SIF) and reflectance measurements.
- FloX instruments are vital for validating the upcoming Fluorescence Explorer (FloX) imaging satellite, requiring high accuracy and continuous data.
- Accurate spectroradiometric calibration and understanding temperature sensitivity are essential for reliable FloX data.
Purpose of the Study:
- To perform spectroradiometric calibration and temperature sensitivity analysis of a FloX unit.
- To assess the impact of environmental temperature variations on FloX instrument performance.
- To quantify radiometric shifts across different temperature ranges.
Main Methods:
- A FloX unit with two spectrometers underwent thermal cycling tests from 0°C to 40°C in 5°C increments.
- External measurements of reflected radiance from a Spectralon panel, illuminated by a tungsten lamp, were conducted via optical fibers.
- Radiance values within the SIF spectral range were measured and compared to nominal values at 20°C.
Main Results:
- Mean radiance values showed changes exceeding 3% for the high-resolution sensor and 4% for the broadband sensor relative to 20°C.
- Radiometric shifts were identified as a systematic effect of changing environmental temperature.
- Analysis of uncertainty contributions confirmed temperature as a significant factor influencing measurements.
Conclusions:
- Environmental temperature significantly impacts the radiometric measurements of the FloX instrument.
- These temperature-induced radiometric shifts must be accounted for to ensure the accuracy of SIF measurements.
- Understanding and correcting for temperature sensitivity is critical for FloX data reliability, especially for satellite validation efforts.
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