Post-launch observations required to characterize flatfields

Michael Richmond
Dec 22, 2005
revised Dec 22, 2005

This document describes briefly the type and number of observations required to determine the SNAP detector "flatfield" effects before we can begin normal operations.

The various effects which we expect to see, and the methods by which one can measure them accurately, are described in

Let us list the required observations and add up the time required for each.

To estimate the readout time, I took the IR detector pixel count, 2048x2048 = 4.2 million, and divided by a "slow" readout rate of 100 kHz = 100,000 pixels per second. This yields about 41 seconds to read one IR chip. I assume that the readout time for the optical detectors is the same.

The grand summary of required observations listed above is as follows: