DE4026726A1 - Transparent cover with enhanced absorption for specific wavelength - comprising substrate pref. of polymer, pref. indium-tin oxide semiconductor layers and spacer layer - Google Patents
Transparent cover with enhanced absorption for specific wavelength - comprising substrate pref. of polymer, pref. indium-tin oxide semiconductor layers and spacer layerInfo
- Publication number
- DE4026726A1 DE4026726A1 DE4026726A DE4026726A DE4026726A1 DE 4026726 A1 DE4026726 A1 DE 4026726A1 DE 4026726 A DE4026726 A DE 4026726A DE 4026726 A DE4026726 A DE 4026726A DE 4026726 A1 DE4026726 A1 DE 4026726A1
- Authority
- DE
- Germany
- Prior art keywords
- pref
- semiconductor layers
- transparent
- layers
- substrate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B17/00—Layered products essentially comprising sheet glass, or glass, slag, or like fibres
- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
- B32B17/10005—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin laminated safety glass or glazing
- B32B17/10165—Functional features of the laminated safety glass or glazing
- B32B17/10174—Coatings of a metallic or dielectric material on a constituent layer of glass or polymer
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
- C03C17/42—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions at least one coating of an organic material and at least one non-metal coating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q17/00—Devices for absorbing waves radiated from an antenna; Combinations of such devices with active antenna elements or systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
Abstract
Description
Die Erfindung betrifft eine spektralselektiv beschichtete Verglasung mit hoher Transparenz im visuellen Spektralbereich und gleichzeitig radarabsorbierenden Eigenschaften. Ihre Anwendung findet sie in der Radartarnung von Flug zeugcockpithauben, Kanzelverglasungen und Helikoptern, Sichtscheiben von Schiffen, Fenstern in Gebäuden oder Fahrzeugen.The invention relates to spectrally selectively coated glazing with high Transparency in the visual spectral range and at the same time radar-absorbing Properties. They are used in the radar camouflage of flight cockpit hoods, cockpit glazing and helicopters, viewing panels from Ships, windows in buildings or vehicles.
Dei Forderung nach Transparenz im visuellen und Radartarnwirkung konnte bislang nur mit einer radarreflektierenden Beschichtung, welche beispiels weise aus einer dünnen transparenten Metallschicht besteht, erfüllt werden. Die Wirkung beruht hierbei auf einer Zerstreuung des Radarstrahls an der gewölbten Cockpitoberfläche.The demand for transparency in the visual and radar camouflage effect could So far only with a radar reflective coating, which for example consists of a thin, transparent metal layer. The effect is based on a scattering of the radar beam at the arched cockpit surface.
Aufgabe der Erfindung ist es, eine Verglasung vorzugschlage, die durch ihre radarabsorbierende Wirkung eine höhere Tarnwirksamkeit aufweist.The object of the invention is to propose a glazing by its radar-absorbing effect has a higher camouflage effectiveness.
Diese Aufgabe wird erfindungsgemäß gelöst von Scheiben mit den in den Ansprüchen genannten Merkmalen. Aus Festigkeitsgründen ist eine Flugzeug cockpithaube aus einem Verbund mehrerer Schalen aufgebaut. Die Dicke der einzelnen Teile bewegt sich dabei im Bereich von 4 mm bis 10 mm, bei einer Gesamtdicke von 20 mm bis 25 mm. Die Erfindung nutzt diesen Mehrschichten aufbau der Haube indem, je nach Ausführung, eine oder zwei dieser Schalen als λ/4n-Abstandsschichten (n=Brechungsindex des Schalenmaterials) eines Interferenzsystems für Mikrowellen-Strahlung verwendet werden. Die Schalen werden mit transparenten leitfähigen Halbleiterschichten wie Indium zinnoxid sputterbeschichtet und danach mit einem transparenten Kleber auf Acryl- Polyurethan- oder Silikonbasis miteinander verbunden.This object is achieved according to the invention by the disks in the Features mentioned claims. An airplane is for strength reasons cockpit hood constructed from a composite of several shells. The thickness of the individual parts moves in the range from 4 mm to 10 mm, at one Overall thickness from 20 mm to 25 mm. The invention uses these multilayers build the hood by, depending on the version, one or two of these Shells as λ / 4n spacer layers (n = refractive index of the shell material) an interference system for microwave radiation can be used. The Shells are made with transparent conductive semiconductor layers like indium tin oxide sputter-coated and then with a transparent adhesive Acrylic, polyurethane or silicone base bonded together.
Die Erfindung wird nachfolgend anhand der Fig. 1 und Fig. 2 bespielhaft für eine Absorbermittenfrequenz von 10 GHz erläutert.The invention is explained below with reference to Fig. 1 and Fig. 2 exemplary of an absorber center frequency of 10 GHz.
Fig. 1 zeigt eine Ausführung mit einem Träger 1 - hier Polymethylmethacrylat. Auf den Träger ist eine mit einem radarreflektierenden transparenten Halb leiterfilm 2 - hier Indiumzinnoxid mit einem Schichtwiderstand von 10 Ω und einer Dicke von 500 nm-beschichtete λ/4n-Polymethylmethacrylat-Schale 3 von 4,6 mm Dicke aufgeklebt. Auf der Außenseite ist diese mit einer weiteren Halbleiterschicht 4 - hier Indiumzinnoxid mit einem Schichtwiderstand von 377 Ω und einer Dicke von 100 nm - versehen. Fig. 1 shows an embodiment with a carrier 1 - here polymethyl methacrylate. On the carrier is a with a radar reflecting transparent semiconductor film 2 - here indium tin oxide with a sheet resistance of 10 Ω and a thickness of 500 nm-coated λ / 4n polymethyl methacrylate shell 3 of 4.6 mm in thickness. On the outside, this is provided with a further semiconductor layer 4 - here indium tin oxide with a sheet resistance of 377 Ω and a thickness of 100 nm.
Die Absorberwirkung kommt durch die Übertragung der an den zwei Halb leiterschichten reflektierten Teilstrahlen zustande. Bei geeignet gewählter Dicke der Polymethylmethacrylat-Zwischenschicht λ/4n löschen sich die Teilstrahlen gerade aus. Der Absorber erreicht seine maximale Wirkung bei der Wellen länge λ.The absorber effect comes from the transfer of the two halves conductor layers reflected partial beams. With a suitably chosen thickness of the polymethyl methacrylate intermediate layer λ / 4n the partial beams are extinguished straight. The absorber reaches its maximum effect on the waves length λ.
Fig. 2 zeigt eine Ausführung, bei der der Absorber aus Fig. 1 um ein weiteres Polymethylmethacrylat-Teil 5 auf der vorderen Halbleiterschicht ergänzt wurde. Durch diese zusätzliche λ/4n-Schicht wird die Breitbandigkeit der Absorber wirkung vergrößert. FIG. 2 shows an embodiment in which the absorber from FIG. 1 has been supplemented by a further polymethyl methacrylate part 5 on the front semiconductor layer. This additional λ / 4n layer increases the broadband effect of the absorber.
In Fig. 3(1) wird das Mikrowellenreflexionsvermögen einer Schichtfolge nach Fig. 1 abgebildet. Eine Signalreduzierung um ca. 14 dB ist über einen breiten Frequenzbereich von ca. 8,5 GHz bis 11,5 GHz zu beobachten.In Fig. 3 (1), the microwave reflectivity of a layer sequence according to Fig. 1 ready. A signal reduction of approx. 14 dB can be observed over a wide frequency range from approx. 8.5 GHz to 11.5 GHz.
Die Radarreflexion einer Ausführung nach Fig. 2 ist in Fig. 3(2) aufgeführt. Die Reflexionsminderung beträgt mindestens 14 dB im Bereich von 5,5 GHz bis 14,5 GHz. Die Bandbreite der Absorberwirkung wird somit deutlich größer. Weitere Verbreitung der Wirkung lassen sich durch Hinzufügen weiterer Indiumzinnoxid-Polymethylmethacrylat-Pakete erzielen (Fig. 3(3) bei einem weiteren Paket).The radar reflection of an embodiment according to FIG. 2 is shown in FIG. 3 (2). The reduction in reflection is at least 14 dB in the range from 5.5 GHz to 14.5 GHz. The range of absorber effects is thus significantly larger. The effect can be spread further by adding further indium tin oxide polymethyl methacrylate packages ( FIG. 3 (3) for another package).
Geeignete Materialien sind in den Unteransprüchen angegeben, wobei zu beachten ist, daß die Dicke aller Schichten an den jeweiligen Frequenzbereich des Absorbens und an die jeweiligen optischen Eigenschaften der verwendeten Materialien angepaßt werden müssen. Die Dicke des Trägermaterials ist unkritisch.Suitable materials are specified in the subclaims, whereby to note that the thickness of all layers depends on the respective frequency range of the absorbent and the respective optical properties of the used Materials need to be adjusted. The thickness of the substrate is not critical.
Der Stand der Technik, die Verwendung einer einfachen Reflektorschicht, ist zum Vergleich in Fig. 3 eingetragen.The prior art, the use of a simple reflector layer, is entered in FIG. 3 for comparison.
Claims (8)
- a) mindestens ein Träger (1).
- b) zwei transparente Halbleiterschichten (2, 4),
- c) eine dazwischen befindliche transparente Abstandsschicht (3).
- a) at least one carrier ( 1 ).
- b) two transparent semiconductor layers ( 2, 4 ),
- c) a transparent spacer layer ( 3 ) located between them.
- a) mindestens ein Träger (1),
- b) zwei transparente Halbleiterschichten (2, 4),
- c) zwei transparente Abstandsschichten (3, 5).
- a) at least one carrier ( 1 ),
- b) two transparent semiconductor layers ( 2, 4 ),
- c) two transparent spacer layers ( 3, 5 ).
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4026726A DE4026726A1 (en) | 1990-08-24 | 1990-08-24 | Transparent cover with enhanced absorption for specific wavelength - comprising substrate pref. of polymer, pref. indium-tin oxide semiconductor layers and spacer layer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4026726A DE4026726A1 (en) | 1990-08-24 | 1990-08-24 | Transparent cover with enhanced absorption for specific wavelength - comprising substrate pref. of polymer, pref. indium-tin oxide semiconductor layers and spacer layer |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4026726A1 true DE4026726A1 (en) | 1992-02-27 |
Family
ID=6412793
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE4026726A Withdrawn DE4026726A1 (en) | 1990-08-24 | 1990-08-24 | Transparent cover with enhanced absorption for specific wavelength - comprising substrate pref. of polymer, pref. indium-tin oxide semiconductor layers and spacer layer |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4026726A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2728394A1 (en) * | 1994-12-20 | 1996-06-21 | Giat Ind Sa | Microwave absorbent element e.g. for radar applications |
WO2004016562A1 (en) * | 2002-08-15 | 2004-02-26 | Totalförsvarets Forskningsinstitut | Transparent pane with radar-reflecting properties |
US20220015275A1 (en) * | 2015-12-14 | 2022-01-13 | Nitto Denko Corporation | Electromagnetic wave absorber |
-
1990
- 1990-08-24 DE DE4026726A patent/DE4026726A1/en not_active Withdrawn
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2728394A1 (en) * | 1994-12-20 | 1996-06-21 | Giat Ind Sa | Microwave absorbent element e.g. for radar applications |
WO2004016562A1 (en) * | 2002-08-15 | 2004-02-26 | Totalförsvarets Forskningsinstitut | Transparent pane with radar-reflecting properties |
US20220015275A1 (en) * | 2015-12-14 | 2022-01-13 | Nitto Denko Corporation | Electromagnetic wave absorber |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8141 | Disposal/no request for examination |