Abstract: The invention relates to a thermal infrared transparent polymer film suitable for use in an identification device, said film comprising an infrared transparent polymer matrix with a pigment dispersed therein, wherein the thickness of the polymer film is greater than 30 micron and wherein the polymer film has an average transmission in the thermal infrared of greater than or equal to 0.5. Preferably, the pigment comprises an inorganic material. There is further provided a thin film, thermally reflective material (20) comprising the afore-mentioned infrared transparent film (21) and an infrared reflective layer provided on one surface thereof (22).

Abstract: The invention relates to a thermal infrared transparent polymer film suitable for use in an identification device, said film comprising an infrared transparent polymer matrix with a pigment dispersed therein, wherein the thickness of the polymer film is greater than 30 micron and wherein the polymer film has an average transmission in the thermal infrared of greater than or equal to 0.5. Preferably, the pigment comprises an inorganic material. There is further provided a thin film, thermally reflective material (20) comprising the afore-mentioned infrared transparent film (21) and an infrared reflective layer provided on one surface thereof (22).

Abstract: The invention relates generally to an electro-optic identification device, particularly to a helmet-mounted identification device. An identification device suitable for mounting on an object comprises a support structure having a plurality of electro-optic emitters positioned thereon, wherein the support structure conforms, in use, to the shape of said object. Preferably, the support structure takes the form of a plurality of emitter arms radiating from a hub, each arm comprising one or more electro-optic emitters. The electro-optic emitters may include visible emitters and/or infrared emitters, and are more preferably selected from the group consisting of near infrared emitters, medium wave thermal infrared emitters and long wave thermal infrared emitters, or any combination thereof. The invention has particular utility in military applications.