Fast Stray Light Performance Evaluation Based on BSDF and Radiative Transfer Theory

Area of Science:

• Optical Engineering
• Radiative Transfer Theory

Background:

• Evaluating stray light is crucial for optical system performance.
• Existing methods like Monte Carlo and ray tracing are computationally intensive and complex.

Purpose of the Study:

• To develop a rapid and efficient method for evaluating stray light performance in optical systems.
• To quantitatively determine stray light outside the field of view.

Main Methods:

• Utilized radiative transfer theory based on bidirectional scattering distribution function (BSDF).
• Derived light vector variation relationships and incorporated specular scattering properties.
• Constructed a fast quantitative evaluation model for stray light elimination capability.

Main Results:

• Developed a loop nesting procedure for rapid stray light assessment.
• Successfully fitted the point source transmittance (PST) curve.
• Quantitatively predicted stray light outside the field of view with high accuracy.

Conclusions:

• The proposed method offers a computationally efficient alternative (10^-5 computing time) for stray light evaluation.
• Suitable for rapid assessment and structural screening of symmetric off-axis reflective optical systems.
• Promising for enhancing imaging accuracy and developing lightweight space cameras with reduced stray light.