a thermal imaging system including a housing having a cavity therein is provided . a plurality of thermal sensors are placed in the cavity of the housing and an ir window in the opening of the cavity protects the thermal sensors . the ir window includes first and second faceplates formed from an ir transmissive material and a honeycomb support structure between the faceplates for supporting the faceplates . the window may also include an adhesive layer between each faceplate and the support structure for adhering each faceplate to the support structure .