High-Resolution Infrared Reflectance Distribution Measurement Under Variable Temperature Conditions

Area of Science:

• Optics and Photonics
• Materials Science
• Remote Sensing

Background:

• Bidirectional Reflectance Distribution Function (BRDF) is crucial for characterizing target reflectance.
• BRDF measurements are essential for correcting infrared remote sensing data and improving accuracy.
• Target reflectance changes with temperature, necessitating variable-temperature BRDF measurements.

Purpose of the Study:

• To develop a variable-temperature infrared BRDF measurement system using a robotic arm.
• To achieve high-resolution, wide-temperature region measurements of BRDF.
• To provide technical support for evaluating high-temperature material optical properties.

Main Methods:

• A robotic arm system with a shaping optical path for laser beam expansion.
• Laser level for precise 3D coordinate adjustment of the robotic arm.
• Dichotomy method for nonlinear detector calibration and a portable PID-controlled heater.

Main Results:

• System effectiveness verified through specular and diffuse BRDF measurements at room temperature.
• BRDF distribution of SUS314 stainless steel samples measured during temperature increases (20°C to 1000°C).
• Summarized the changing rules of BRDF in variable temperature environments.

Conclusions:

• The developed system enables high-resolution, wide-temperature BRDF measurements.
• The findings support the evaluation of optical properties for high-temperature materials.
• Improved accuracy in remote sensing data correction is facilitated by this technology.