System Calibration for Both Beams

Ideally, a system calibration should be conducted twice a day at times when the sun has an elevation higher than 20 degrees. A system calibration comprises of the following steps.

• Take flat field images For each spectral line in your sequence.
• Take dark field images In order to determine image zero level in post processing.
• Take pinhole images This is for wideband/narrowband alignment.

The following sections outline each step of the procedure in more detail.