Abstract: A transceiver comprises a transmitter configured to transmit data signals, a receiver configured to receive data signals, and a controller configured to encrypt a string and supply the encrypted string to authenticate the transceiver.

Abstract: A woven or non-woven fabric is coated on both sides with a plastic material, followed by a vapor-deposited metal coating having a specific surface resistivity of 0.5 to 1.5 ohms per square, and then with a paint layer having a pattern of small areas of green and large areas of white to imitate a winter landscape and comprising a binder which is transparent in the spectral regions of atmospheric windows II (3-5 .mu.m) and III (8-15 .mu.m).

Abstract: A camouflage material with wide-band effect ranging from the visible portion of the spetrum, the IR region of the spectrum from 1 to 20 micrometers, as well as the radar region from 3 GHz to 3,000 GHz, consisting of at least a base layer with a vapor deposited metallic reflecting layer having a surface resistivity of 0.1 to 10 ohms per square and a camouflage paint layer applied thereon, the pigments of which have reflectivity that is similar, in the visible and near infrared portions of the spectrum, to that of the natural background, for example, to chlorophyll. In order to insure that such a camouflage material provides secure protection against detection by thermal imaging apparatus, even in the far IR region of the spectrum, without reducing the protective effect in the visible and near IR region of the terrestrial thermal radiation as well as in the radar region, the camouflage paint contains a binder that has good transparency in the spectral regions of the atmospheric windows II (3-5 .mu.

Abstract: An arrangement for camouflaging military targets in the spectral range of electromagnetic radiation from ultraviolet light to radar waves by contrast reduction between target and background. Emission and/or remission contrast of the target towards the natural background is reduced by applying camouflaging nets which are provided with a specially cut garnishing made of a compound texture in which each single layer affects part of the total electromagnetic spectrum. The layers are arranged so that the camouflaging effect of a single layer does not destroy the others. The reduction of the temperature contrast between target and background of warm or hot targets is achieved by means of heat-reduction carpets. The reduction of temperature contrast of objects currently producing heat is achieved by additionally blowing off hot gases that are surrounded by laminar flows of cold air in special channels where warming up of the camouflaging set-up itself by the hot gases is avoided.

Abstract: An arrangement for the protection of vehicles against IR-IMAGING equipment by cooling air, in which the hot or warm exhaust gases are surrounded by a laminar flow of cooling air. The outside air which is drawn in by the cooling mechanism or the motor ventilation system, is first moved over the thermally radiating areas of the vehicle, and then to the cooling unit or the motor itself for combustion. Part of the outside air which is drawn in, serves as the laminar cover stream of the transferred heated-up cooling air and/or the exhaust gases. These exhaust gases, the heated up cooling air and the surrounding outside air represents a coaxial system of gas flows. In the center of this system, flow the exhaust gases, and the heated-up cooling air flows in the central annular portion. The outside air is directed through the outside annular flow portion of the coaxial system.

Abstract: Heat reflecting wall covering comprising a carrier substrate having a discontinuous metal layer thereon produced by (1) providing a brittle coating under the metal layer and then breaking up the same to also break-up the metal layer; or (2) selectively etching the metal layer to avoid any large electrically conductive areas; or (3) spraying the metal layer through a mask, such as wire mesh to obtain high ohmic resistance and subsequently covering with a veneer protection coat and a veneer coat.

Abstract: The wall/ceiling covering has a reflectivity for infrared radiation of more than 60% and comprises a substrate of paper or plastic or tile material, a discontinuous thin metal layer, a veneer protective layer thereon and a veneer coating which comprises a binder and at least one coloring agent, and which is substantially transparent in the wavelength range of 4 to 20 .mu.m.

Abstract: A camouflage net with two or more layers of a carrier net having garnishing stretch fabric material thereon so spread out as to prevent any radiation perpendicular to said net from penetrating the same. The spacing of the layers held together by tapes and cords are determined by the length of said tapes and cords.

Abstract: A heat reflecting wall-paper comprising a base of carrier material with a vapor deposited, but discontinuous surface metal layer thereon so as to be substantially non-electrically conductive and covered with a veneer layer and thereon a veneer protection layer.

Abstract: Tents with one or more walls for military use that provide protection against modern sight and IR-optical search methods, in which plastic-coated metallized cloth is used as a material for the tent walls and roofs. The outer side of the outermost tent wall is provided with known camouflage paints. The inner side of the outer cloth layer as well as the outsides and insides of the inner cloth layers are provided with only one color that is practically impervious to the infrared portion of the spectrum of about 3 to 20 .mu.m.

Abstract: The thermal imaging device comprises an IR-transmitting scanning polygon arranged behind an objective system. The polygon rotates about two mutually perpendicular axes, i.e. about the optical axis of the device and about the axis of rotation of the scanning polygon which is perpendicular thereto. The rays which emerge from the polygon pass through a reversing optic, which also rotates about the optical axis but with half the angular frequency of the scanning polygon around this axis. Behind this a multichannel IR detector array is arranged, to which a multichannel summing amplifier is connected. The amplifier is synchronized with the frequency of the rotation of the scanning polygon about its own axis. This rotation of the scanning polygon at the same time constitutes the radial deflection frequency for displaying the image.