Patent ID: 7609978

Claim:
A signal conditioning module configured for insertion into a photometric system to enable the photometric system to operate as a polarimeter, the signal conditioning module comprising: a plurality of cascaded variable delay polarization modulators, each of the plurality of modulators comprising: an input port; a first arm comprising a first reflector and first rooftop mirror arranged in opposed relationship, the first reflector directing an input radiation signal from the input port towards the first rooftop mirror; an output port; a second arm comprising a second reflector and second rooftop mirror arranged in opposed relationship, the second reflector guiding a signal from the second rooftop mirror towards the output port to provide an output radiation signal; a grid placed between the first reflector and the first rooftop mirror, and also placed between the second reflector and the second rooftop mirror; and translation apparatus for adjustment of relative optical path length vis-à-vis the first arm, the second arm and the grid.