To prevent ionic buildup, which can damage the liquid crystal layer, liquid crystal devices should be electrically driven with an AC waveform with little to no DC component. We require a 2 kHz square wave of adjustable amplitude for controlling our Liquid Crystal Variable Retarders (LCVRs). Our Basic Controller and Four Channel Interface ensure these drive requirements are met.

 

A temperature sensing and control option can be added to our LCVRs for accurate control of the operating temperature. A temperature sensor is attached directly to the LCVR substrate, outside its clear aperture and a heater is attached to the LCVR housing. This provides active heating and passive cooling of the liquid crystal device.