Flat Fielding: Lenslet Array Flat


This is one of the areas where algorithms are still in flux and calibration methods are not fully mature.

Observed Effect and Relevant Physics:

Differential throughput of lenslets. Scattered handful of low throughput lenslets, plus a regular grid pattern due to artifacts from the lenslet manufacturing photolithography.

before and after correction

Pipeline Processing:

Use ‘Divide by Lenslet Flat Field’ primitive with a relevant lensletflat file.

Creating Calibrations:

Currently done via code not yet integrated into the pipeline

Relevant GPI team members

Marshall Perrin, Patrick Ingraham