EP1637829B1 - Pack of heat-generating countermeasures - Google Patents
Pack of heat-generating countermeasures Download PDFInfo
- Publication number
- EP1637829B1 EP1637829B1 EP04445095.5A EP04445095A EP1637829B1 EP 1637829 B1 EP1637829 B1 EP 1637829B1 EP 04445095 A EP04445095 A EP 04445095A EP 1637829 B1 EP1637829 B1 EP 1637829B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- bodies
- pack
- heat
- joined
- oxidizing
- 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.)
- Not-in-force
Links
- 230000001590 oxidative effect Effects 0.000 claims description 28
- 239000000463 material Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- 230000002787 reinforcement Effects 0.000 claims description 4
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- IOLCXVTUBQKXJR-UHFFFAOYSA-M potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B4/00—Fireworks, i.e. pyrotechnic devices for amusement, display, illumination or signal purposes
- F42B4/26—Flares; Torches
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F41—WEAPONS
- F41J—TARGETS; TARGET RANGES; BULLET CATCHERS
- F41J2/00—Reflecting targets, e.g. radar-reflector targets; Active targets transmitting electromagnetic or acoustic waves
- F41J2/02—Active targets transmitting infrared radiation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Packages (AREA)
- Air Bags (AREA)
Description
- In accordance with the preamble of independent claim 1, the present invention relates to a pack of heat-generating countermeasures comprising a container with a lid forming a tight-closing pack and accommodating heat-generating countermeasures in the form of material which oxidizes on contact with oxygen and thus generates heat, which is intended to be dispensed from sea, land or air-based systems, heat being generated when the pack, on being dispensed, is opened so that the contents of the pack come into contact with the oxygen in the air and are oxidized. Packs of this kind are used for generating decoys to counter heat-seeking homing missiles.
- A common type of decoy to counter heat-seeking homing missiles is hot bodies which are placed in the field of vision of the missile and are intended to disrupt the target seeker. Conventionally, pyrotechnic magnesium-based flares have been used. These maintain a relatively high temperature, which means that the ratio between the heat signature of the flare and the signature of the aircraft tends to be greater than one, which is normally attractive to a thermal-target seeker. More modern thermal-target seekers may be equipped with filters and other devices which, using various techniques, distinguish such flares. It is therefore of interest instead to make use of oxidizing heat-generating material with a lower temperature and a larger radiating area, which can obtain a ratio between the oxidizing heat-generating material and the heat signature of the aircraft which is greater than one without activating these filters and other devices.
- In this connection, it is previously known from our Swedish patent application
0300322-5 - In utilization of the technique with oxidizing heat-generating material, it is inter alia desirable to:
- 1. maximize the quantity of oxidizing material in a given volume.
- 2. adapt the oxidation properties of the oxidizing material to the situation in which it is to be used, for example to the heat signature of the platform or to the characteristics of the expected threat.
- 3. minimize the quantity of material which lands on the ground after use. This is of particular importance when used in civil aviation.
- The object of the present invention is to produce a pack of heat-generating countermeasures which satisfies the wishes referred to above better than previously known constructions. The object of the invention is achieved in accordance with the characterizing part of independent claim 1 by a pack characterized in that the oxidizing material consists essentially of oxidizing powder joined together to form one or more joined-together bodies. The oxidizing heat-generating bodies are therefore completely or virtually completely constructed from oxidizing material, which means that they act as carrier, heat generator and grey body radiator at one and the same time. By using the oxidizing material as a grey radiator, a greater quantity of oxidizing material can be enclosed within a given volume. This can be utilized in order, for example, to generate a longer burning time or alternatively a greater radiating area per given volume. Moreover, the maximum operating temperature and rise time of the bodies can be controlled and adapted to the situation in which they are to be used. After use, the oxidizing heat-generating bodies will have burned up completely or virtually completely before they reach the ground, which minimizes contamination on the ground or platform.
- According to an advantageous embodiment of the invention, the joined-together bodies formed by joining the oxidizing powder together consist essentially of iron sulphide. The joining-together can be effected by, for example, a sintering process to form a body of suitable shape and mass.
- Alternatively, the joined-together bodies can consist essentially of a pure metal such as iron or aluminium.
- In order to hold the bodies formed by the joined-together powder together, the bodies can, according to another advantageous embodiment, comprise binder. Alternatively, the bodies can comprise reinforcement or binder and reinforcement in combination. The reinforcement can be in the form of, for example, glass fibre, and the binder can be in the form of, for example, potassium bromide.
- According to another advantageous embodiment, the bodies include substances which, when oxidation of the oxidizing material takes place, give off exhaust-gas-like gases, such as, for example, CO, CO2 or H2O. By imitating the gases which are found in proximity to the exhaust discharge of an engine while generating heat radiation in certain frequency bands, it is possible to make it more difficult for certain advanced heat-seeking homing missiles to distinguish the oxidizing heat-generating bodies as decoys.
- The decisive factors for the action of the oxidizing heat-generating bodies against a heat-seeking homing missile are their temperature, their emissivity, their number, the spread of the bodies in the space within the field of vision of the target seeker and their radiating area projected in the field of vision of the missile. The time it takes for the body to reach its operating temperature from ambient temperature and how long the body is capable of maintaining this temperature also have an effect. The design of the body will also control the way in which the body is cooled by conduction and convection and influence its aerodynamic qualities. It is therefore desirable for it to be possible to vary the design of the bodies according to application, that is to say according to the platform to be protected and according to the threat which can be expected.
- The oxidizing heat-generating bodies are of the nature of a pellet. The shape of the bodies can therefore be adapted so that all the characteristics mentioned above are adapted to the demands made in an operational situation. An important parameter controlled by the shape is the ratio between surface area and volume. The larger the surface area exposed to air, the greater the effect produced. A higher ratio therefore gives a higher temperature but a shorter burning time for a given volume (mass). Generally, it can also be said that cooling and air resistance increase as the ratio increases. A typical design of the oxidizing heat-generating bodies which tends to give a high burning temperature is a rectangular or square body with a thin cross section. Such a body is suitable for protecting a platform with high heat radiation of its own. Such a body also has an extent and shape suitable for packing in a box. By increasing the thickness of the body, but retaining the same basic shape, a lower burning temperature and a smaller radiating area but a longer burning time are obtained. Such a body is suitable for protecting a platform with a lower heat radiation of its own and a lower speed, which means that the body will remain in the field of vision of the target seeker for a longer time, for which reason a longer burning time is desirable. A typical such platform is a slow-moving transport aircraft or a civil passenger aircraft.
- It is clear from the above that the joined-together bodies can have a varying shape depending on the requirements in an operational situation. In this context, however, two shape types are indicated.
- In this connection, according to a first advantageous embodiment of the pack, the bodies are designed with an essentially spherical shape. By virtue of their spherical shape, good strength and a slow oxidization process are obtained.
- According to a second advantageous embodiment, the bodies are designed with an essentially flat rectangular shape. The shape allows the space in standardized flat containers for countermeasures to be filled efficiently. By changing the thickness, for example, the burning time and burning temperature can be adjusted.
- The invention will be described in greater detail below by means of an illustrative embodiment with reference to accompanying drawings, in which:
-
Figure 1 shows diagrammatically in a longitudinal section a dispenser loaded with packs of countermeasures according to the invention; -
Figure 2 shows diagrammatically a pack of heat-generating countermeasures according to the invention; -
Figures 3a-c show three examples of suitable shapes for the joined-together bodies which constitute the oxidizing material of the pack, and -
Figure 4 shows examples of burning profile based on burning temperature as a function of time. - The dispenser 1 shown diagrammatically in
Figure 1 is filled with packs 2 which, when opened, generate heat. A spring-loadedpiston 3 displaces the packs towards theopening 4 of the dispenser 1 where a mechanical launching mechanism 5 launches one pack at a time through theopening 4. Adjacent to theopening 4 is anopening mechanism 6 for opening the packs in connection with their being launched or dispensed. Theopening mechanism 6 can comprise some form of gripping means which takes hold of and pulls off an openable part of the pack. Alternatively, the opening mechanism can comprise some form of cutting means, for example a knife, which cuts open the pack in connection with it leaving the dispenser. - The pack 2 shown in
Figure 2 comprises acontainer 7 consisting of abottom plate 8 and four side walls 9-12. The container is closed by alid 13 which can be, for example, glued firmly to the edges of the side walls 9-12 facing thelid 13. The container accommodates joined-togetherbodies 14 indicated by broken lines which constitute oxidizing material and thus react with oxygen, generating heat, when the pack is opened and the air is given access. In this example, the bodies are indicated as having a flat rectangular shape, but there are many other possible shapes. - Examples of shapes which may be suitable for the joined-together bodies are shown in
Figure 3. Figure 3a shows a spherical shape. The spherical shape has a small surface area in relation to volume and can advantageously be used if a long burning time is required. The spheres can be given a larger or smaller diameter depending on the desired effect. It may also be suitable to mix different sizes. Thebodies 14 shown inFigures 3b and 3c have two plane opposite rectangularmain surfaces Figure 3c is more elongate than the one shown inFigure 3b . By varying the thickness of the bodies, for example, the burning time and burning temperature can be changed. In principle, it can be said that a thicker body with the same volume as a thinner one gives a lower burning temperature and longer burning time. The shapes shown inFigures 3b and 3c lend themselves especially well to being packed in the type of pack shown inFigure 2 . The bodies can relatively easily be dimensioned so that they fill the entire interior of the pack. -
Figure 4 shows examples of how the burning temperature T can vary as a function of time t. In this connection, theupper curve 15 shows a burning profile with a relatively high burning temperature and short burning time, while the lower curve 16 shows a burning profile with a relatively low burning temperature and long burning time. It can be useful if thefront flanks 17, 18 of the curves are relatively steep so that the countermeasures work with full force quickly. - The invention is not limited to the embodiments shown as examples above but can undergo modifications within the scope of the patent claims below.
Claims (8)
- Pack of heat-generating countermeasures comprising a container with a lid forming a tight-closing pack and accommodating heat-generating countermeasures in the form of material which oxidizes on contact with oxygen and thus generates heat, which pack is intended to be dispensed from sea, land or air-based systems, heat being generated when the pack, on being dispensed, is opened so that the contents of the pack come into contact with the oxygen in the air and are oxidized, characterized in that the oxidizing material consists essentially of oxidizing powder joined together to form one or more joined-together bodies, the oxidizing heat-generating bodies being completely or virtually completely constructed from oxidizing material, wherein said bodies act as carrier, heat generator and grey body radiator at one and the same time.
- Pack according to patent claim 1, characterized in that the joined-together bodies formed by joining the powder together consist essentially of iron sulphide.
- Pack according to patent claim 1, characterized in that the joined-together bodies consist essentially of pure metal such as iron or aluminium.
- Pack according to any one of the preceding patent claims, characterized in that the bodies formed by the joined-together powder comprise binder in order to hold the individual body together.
- Pack according to any one of the preceding patent claims, characterized in that the bodies formed by the joined-together powder comprise reinforcement in order to hold the individual body together.
- Pack according to any one of the preceding patent claims, characterized in that the bodies include substances which, when oxidation of the oxidizing material takes place, give off exhaust-gas-like gases, such as, for example, CO, CO2 or H2O.
- Pack according to any one of the preceding patent claims, characterized in that the bodies are designed with essentially spherical shape.
- Pack according to any one of preceding patent claims 1-6, characterized in that the bodies are designed with an essentially flat rectangular shape.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK04445095.5T DK1637829T3 (en) | 2004-09-15 | 2004-09-15 | Package of heat-generating countermeasures |
EP04445095.5A EP1637829B1 (en) | 2004-09-15 | 2004-09-15 | Pack of heat-generating countermeasures |
ES04445095.5T ES2638241T3 (en) | 2004-09-15 | 2004-09-15 | Heat generating countermeasures package |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04445095.5A EP1637829B1 (en) | 2004-09-15 | 2004-09-15 | Pack of heat-generating countermeasures |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1637829A1 EP1637829A1 (en) | 2006-03-22 |
EP1637829B1 true EP1637829B1 (en) | 2017-05-31 |
Family
ID=34932997
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04445095.5A Not-in-force EP1637829B1 (en) | 2004-09-15 | 2004-09-15 | Pack of heat-generating countermeasures |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1637829B1 (en) |
DK (1) | DK1637829T3 (en) |
ES (1) | ES2638241T3 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2396221A4 (en) * | 2009-02-11 | 2014-03-12 | Saab Ab | Decoy material package, a dispenser and a method for dispensing decoy material |
US8403253B1 (en) | 2009-03-18 | 2013-03-26 | Israel Aerospace Industries Ltd. | Active IR signature target simulation system and a method thereof |
EP4070030B1 (en) * | 2019-12-05 | 2024-05-15 | Saab Ab | System for ejection of countermeasure boxes |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE757673A (en) * | 1969-11-05 | 1971-04-01 | France Etat | PYROTECHNIC COMPOSITION WITH HIGH LUMINOUS POWER AND ITS MANUFACTURING PROCESS |
US4978400A (en) * | 1989-11-17 | 1990-12-18 | General Sciences, Inc. | Synergistic composite pyrotechnic material |
US5472533A (en) * | 1994-09-22 | 1995-12-05 | Alliant Techsystems Inc. | Spectrally balanced infrared flare pyrotechnic composition |
GB9612655D0 (en) * | 1996-06-17 | 2003-05-28 | Secr Defence | Infra-red emitting decoy flare |
AU5243598A (en) * | 1996-11-15 | 1998-06-22 | Cordant Technologies, Inc. | Extrudable black body decoy flare compositions and methods of use |
US6427599B1 (en) * | 1997-08-29 | 2002-08-06 | Bae Systems Integrated Defense Solutions Inc. | Pyrotechnic compositions and uses therefore |
US6055909A (en) * | 1998-09-28 | 2000-05-02 | Raytheon Company | Electronically configurable towed decoy for dispensing infrared emitting flares |
SE525519C2 (en) * | 2003-02-10 | 2005-03-01 | Saab Ab | Process for producing heat-generating countermeasures, as well as packaging with heat-generating countermeasures |
-
2004
- 2004-09-15 DK DK04445095.5T patent/DK1637829T3/en active
- 2004-09-15 ES ES04445095.5T patent/ES2638241T3/en active Active
- 2004-09-15 EP EP04445095.5A patent/EP1637829B1/en not_active Not-in-force
Also Published As
Publication number | Publication date |
---|---|
ES2638241T3 (en) | 2017-10-19 |
EP1637829A1 (en) | 2006-03-22 |
DK1637829T3 (en) | 2017-08-28 |
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