Radiation absorber
AssigneeTotalforsvarets Försknings Institut
InventorNils Gustafsson
Life of this patent
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Abstract
A radiation absorber which is placed on the irradiated side of a conductive surface (L) whose surface resistance <0.1 Ω/square. The radiation absorber comprises three layers, which from said conductive surface outwards consist of a first dielectric (B1), a resistive layer (C1) and a second dielectric (B2). The surface resistance of the resistive layer is 225 Ω/square±25% and the thickness of the layer without a possible carrier <0.2 mm. The dielectric constant ε=2±25% for the two dielectric layers and their thicknesses are of the same order of magnitude. The total thickness dA of the absorber, with all the layers included, is selected according to the formula 1 d A = 1 ϵ · λ 4 in order to give an absorption peak at a desired wavelength λ expressed in metres.
Claims9
A radiation absorber which is placed on the irradiated side of a conductive surface (L) whose surface resistance <0.1 Ω/square, said radiation absorber comprising three layers, which from said conductive surface outwards consist of a first dielectric (B1), a resistive layer (C1) and a second dielectric (B2), characterised in that for the resistive layer the surface resistance is 225 Ω/square ±25% and the thickness of the layer without a possible carrier <0.2 mm, that for the two dielectric layers the dielectric constant ε=2±25%, that the thicknesses of the two dielectric layers are of the same order of magnitude and that the total thickness dA of the radiation absorber, with all the layers included, is selected according to the formula
- 5 d A = 1 ϵ · λ 4
- in order to give an absorption peak at a desired wavelength λ expressed in metres.
A radiation absorber as claimed in any one of the preceding claims, characterised in that the dielectric layers comprise a polyester fabric.
A radiation absorber as claimed in any one of the preceding claims, characterised in that that layers included are glued together with vinylester resin.
A radiation absorber as claimed in any one of the preceding claims, characterised in that the conductive layer (L) is made of carbon fibre reinforced plastic.
Dependencies are inferred from the claim text.