Two-dimensional synchronous stray light detection and correction method for imaging spectrometers

Area of Science:

• Optical Engineering
• Spectroscopy
• Metrology

Background:

• Stray light in imaging spectrometers causes distortions and measurement uncertainty.
• Current methods often measure spectral and spatial stray light separately, leading to inaccuracies.
• This inconsistency undermines the physical validity of correction coefficients.

Purpose of the Study:

• To develop a two-dimensional synchronous stray light detection and joint correction method for imaging spectrometers.
• To create a dedicated platform for simultaneous measurement of spectral and spatial stray light.
• To improve the accuracy and physical validity of stray light correction in imaging spectrometers.

Main Methods:

• Proposed a two-dimensional synchronous stray light detection and joint correction method.
• Developed a dedicated synchronous measurement platform for consistent target and radiance level measurements.
• Constructed a two-dimensional stray light correction matrix for pixel-level joint correction.
• Performed optical mechanical stray light simulations for verification and cross-validation.

Main Results:

• Measured spectral stray light coefficient of 0.02% and spatial stray light coefficient of 0.05%.
• Spatial stray light simulation outcome of 0.013% showed consistency with experimental results.
• Post-correction, the spatial stray light coefficient reduced to 0.012%, a 4.5-fold improvement.

Conclusions:

• The proposed synchronous detection approach effectively measures spectral and spatial stray light.
• The two-dimensional joint correction method significantly improves measurement accuracy.
• This synchronized method enhances the reliability and physical validity of imaging spectrometer data.