Stock material or miscellaneous articles – Composite – Of bituminous or tarry residue
Patent
1989-02-07
1990-09-04
Arnold, Bruce Y.
Stock material or miscellaneous articles
Composite
Of bituminous or tarry residue
350 16, 428919, F41H 300, G02B 522, G02B 526, G02B 528
Patent
active
049539221
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a web material, a foil for camouflage against electromagnetic radiation. It relates particularly to a material which renders more difficult the possibility of detecting a camouflaged object using different forms of electromagnetic radiation, such as visible light, heat radiation or, for example, laser light from active detectors.
BACKGROUND
In order to provide camouflage against discovery, it is known to arrange material in the form of coverings, tarpaulins or foils, that is, web material, to cover the objects one wishes to camouflage. There are several possibilities of discovery against which one wishes to camouflage: By viewing with either diffuse or reflected visible light, by being revealed by reflections of radiation transmitted for reconnaisance purposes (for example laser light or radar waves) as well as by detection of the difference in infrared radiation from the objects in question and from their surroundings. Especially in the latter respect it has been difficult to achieve effective camouflage; the objects to be camouflaged, for example vehicles or buildings, often have heat radiation of their own, which is significantly greater than that of the surroundings, and they can therefore be discovered by means of detectors for infrared light, which can be made very sensitive.
The materials which have been developed for the purpose, in order to camouflage against infrared radiation, have utilized effects such as the limited emissions of a metallic layer or capturing in an insulating layer of the heat radiation from the layer itself. Structured surfaces, colored surfaces, layers consisting of lamina or grains, etc, have been resorted to against reflection of incident radiation.
Technical Problem
Indeed, it has been shown to be possible to find materials which provide good camouflage against discovery by some form of electromagnetic radiation. However this is not sufficient; in order to achieve fully satisfactory camouflaging, the possibilities for discovery using every form of electromagnetic radiation must be eliminated or at least greatly reduced. It is thus necessary to shield the object against discovery by direct observation by an observer as well as against discovery by means of some type of passive or active detectors. It has proven difficult to achieve this even though, in accordance with many suggestions, one has resorted to very complicated structures in the form of thick tarpaulins with broken surfaces and several layers. For the purposes of practical camouflage the worth of such a material is, however, limited because of the difficulties involved in handling and, in transportation.
The Solution
The camouflaging web material according to the invention comprises several layers and is provided with a front side, which is intended to be turned towards a potential observer or detector, as well as a backside, which is intended to be turned towards an object, which is to be camouflaged, wherein a first layer is formed of a metallic foil with at least one reflective surface toward the front side and with a second surface turned towards the backside a second layer is laid on the first surface of the first layer and is chosen to be of a material which is absorbent for visible light and near-infrared radiation (wave length up to approximately 2 .mu.m) as well as transparent for thermal infrared radiation (wave length region 3-100 .mu.m) and that, on the second layer, a third layer is provided, one surface of which forms said front side, the layer being a plastic layer, having a precisely determined thickness and chosen to provide an adapted absorption of radiation in the region 8-13 .mu.m), whereby the front side is textured in an embossed pattern by means of closely spaced groves.
Advantages
By means of the invention a material is achieved having good camouflaging characteristics with respect to all previously known methods of detection, the material being made thin and light and can furthermore be produced using efficient industrial metho
REFERENCES:
patent: 4308882 (1982-01-01), Pusch et al.
patent: 4479994 (1984-10-01), Berg
patent: 4495239 (1985-01-01), Pusch et al.
patent: 4529633 (1985-07-01), Karlsson
patent: 4615921 (1986-10-01), Johansson
patent: 4640851 (1987-02-01), Pusch
patent: 4659602 (1987-04-01), Birch
Arnold Bruce Y.
Callaghan Terry S.
HB Radicool Research & Development
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