Immersion factor determination for TriOS RAMSES radiance sensors

Area of Science:

• Ocean optics
• Radiometry
• Sensor calibration

Background:

• Accurate in-water radiance measurements are crucial for oceanographic studies.
• Immersion factors are essential for correcting sensor readings in aquatic environments.
• Previous studies established immersion factors for RAMSES hyper-spectral radiometers.

Purpose of the Study:

• Determine immersion factors for TriOS RAMSES ARC series radiance sensors.
• Compare these factors with existing data for the same sensor class.
• Propose a representative immersion factor for the RAMSES radiance sensor class.

Main Methods:

• Adapted a method from Zibordi (2006) to determine immersion factors.
• Utilized two distinct light sources: LED and tungsten-halogen lamps.
• Compared results with Zibordi and Darecki (2006) for RAMSES hyper-spectral radiometers.

Main Results:

• Immersion factors for the two tested sensors differed by 0.2%.
• The determined factors differed by an average of 0.3% from Zibordi and Darecki (2006).
• Results indicate consistency in immersion factors across the RAMSES radiance sensor class.

Conclusions:

• Immersion factors for RAMSES radiance sensors are sufficiently constant for class representation.
• An average immersion factor, derived from this study and prior work, is proposed.
• The proposed average immersion factor shows a root-mean-square-difference <0.2% from 400 nm to 900 nm.