[Techniques for pixel response nonuniformity correction of CCD in interferential imaging spectrometer]

Area of Science:

• Optics and Photonics
• Space Science and Engineering
• Image Processing

Context:

• Spaceborne interferential imaging spectrometers rely on charge-coupled devices (CCDs) for data acquisition.
• Pixel response nonuniformity in CCDs significantly impacts interferogram correction and spectral accuracy.
• Existing correction methods face engineering challenges in detector arrays.

Purpose:

• To develop and validate a pixel response nonuniformity correction method for CCDs in visible and infrared interferential imaging spectrometers.
• To quantitatively assess the impact of CCD nonuniformity on interferogram correction and spectrum recovery.
• To propose an improved, post-assembly calibration and correction method.

Summary:

• The study analyzes the relative radiation scaling theorem and scaling data to address CCD nonuniformity in spaceborne interferential imaging spectrometers.
• A novel correction method is presented, effectively resolving engineering challenges in detector arrays and improving spectrum recovery accuracy.
• An enhanced approach involving post-assembly calibration and correction is proposed, offering significant time and manpower savings.

Impact:

• The developed method resolves critical engineering issues in interferential imaging spectrometer systems.
• It quantifies the impact of CCD nonuniformity, enabling more accurate interferogram correction and spectrum recovery.
• The improved post-assembly method enhances calibration accuracy, adaptability to changing environments, and overall system efficiency.