Simulation of stray radiation from optical window with temperature-dependent spectral properties

Area of Science:

• Optical Engineering
• Thermal Analysis
• Materials Science

Background:

• Accurate stray radiation analysis is crucial for optical systems, especially those operating under high heat loads.
• Semitransparent windows are common in optical devices but their optical properties can change with temperature.
• Understanding temperature-dependent optical properties is essential for reliable performance prediction.

Purpose of the Study:

• To investigate the effect of temperature-dependent optical properties on stray radiation in semitransparent windows.
• To analyze the transient temperature response of optical window encapsulation structures under high heat flux.
• To quantify the deviation in stray radiation calculations when temperature effects are ignored.

Main Methods:

• Coupled analysis of stray radiation and temperature fields for semitransparent windows.
• Investigation of transient temperature response under external high-heat flux loading.
• Consideration of inhomogeneous optical properties due to temperature heterogeneity.

Main Results:

• Stray radiation distribution becomes more chaotic when optical properties are temperature-dependent.
• Neglecting temperature dependence can cause a significant deviation (up to 150%) in stray radiation power.
• Stray radiation power is lower in the visible waveband compared to the near-infrared waveband.

Conclusions:

• Temperature dependence of optical properties in semitransparent windows is critical for accurate stray radiation calculations.
• High-precision detection devices require serious consideration of these temperature effects.
• The findings are vital for designing robust optical systems operating under varying thermal conditions.