Synchronous measurement method of a multi-angle scattered light field

Area of Science:

• Optical Engineering
• Remote Sensing
• Metrology

Background:

• Existing multi-angle remote sensing systems face challenges in accurately measuring scattered light fields.
• Precise measurement of scattered light is crucial for understanding Earth's surface properties and calibrating sensors.

Purpose of the Study:

• To develop and validate a novel synchronous multi-angle scattered light field measurement system.
• To address limitations in current multi-angle remote sensing technologies.
• To provide technical support for advanced Earth observation applications.

Main Methods:

• Development of a mathematical model for scattered light field measurement.
• Design of an off-axis catadioptric optical system for hemispheric measurements (zenith angle range of 68°).
• Establishment and calibration of an off-axis calibration model for spatial relationships.
• Accuracy calibration using an integrating sphere light source.

Main Results:

• The developed system achieved a maximum measurement relative error of -3.71%.
• Synchronous measurement of multi-angle scattered light fields was realized for reference targets (Labsphere Permaflect-50, 304 stainless steel).
• Simulations were performed under incident light irradiation within a zenith angle range of -23.5° to +23.5°.

Conclusions:

• The novel measurement system demonstrates high accuracy and capability for synchronous multi-angle scattered light field acquisition.
• This technology supports the development of complex models for Earth's surface multi-angle reflection/radiation.
• It offers potential for improved multi-angle sensor radiation calibration and physical parameter inversion accuracy.