In the search for low-cost wide spectrum imagers it may become necessary to sacrifice the expense of the focal plane
array and revert to a scanning methodology. In many cases the sensor may be too unwieldy to physically scan and
mirrors may have adverse effects on particular frequency bands. In these cases, photonic masks can be devised to
modulate the incoming light field with a code over time. This is in essence code-division multiplexing of the light field
into a lower dimension channel. In this paper a simple method for modulating the light field with masks of the
Archimedes’ spiral is presented and a mathematical model of the two-dimensional mask set is developed.