Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
  • F41H11/00—Defence installations; Defence devices
  • F41H11/02—Anti-aircraft or anti-guided missile or anti-torpedo defence installations or systems
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F41—WEAPONS
  • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
  • F41H9/00—Equipment for attack or defence by spreading flame, gas or smoke or leurres; Chemical warfare equipment
  • F41H9/06—Apparatus for generating artificial fog or smoke screens
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F42—AMMUNITION; BLASTING
  • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
  • F42B12/00—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material
  • F42B12/02—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect
  • F42B12/36—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information
  • F42B12/56—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies
  • F42B12/70—Projectiles, missiles or mines characterised by the warhead, the intended effect, or the material characterised by the warhead or the intended effect for dispensing materials; for producing chemical or physical reaction; for signalling ; for transmitting information for dispensing discrete solid bodies for dispensing radar chaff or infrared material
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S149/00—Explosive and thermic compositions or charges
  • Y10S149/117—Smoke or weather composition contains resin

Definitions

• the invention relates to a method for clouding a gaseous medium in the optical and infrared (I.R.) bands of the spectrum of electromagnetic waves; it also relates to the application of this method to an electro-optical countermeasure device.
• I.R. optical and infrared
• Certain modern weapons systems are particularly effective against relatively sensitive objectives, such as tanks, aircraft, ships, shelters, etc. These weapons systems use projectiles or missiles equipped with electro-optical means of guidance or autoguiding which exploit the energy of the thermal or optical radiation coming from the aimed objective, also called target in what follows. These electromagnetic radiations are: either emitted directly by the target itself, and more precisely by its propulsion system, or that they result indirectly from the diffusion by the target of a natural light or of an intentional light .
• the aim is to create a reflecting and / or absorbing medium, with a view to producing, generally, in the form of a cloud, a protective screen behind which the target to be protected can remain or evolve; according to the passive technique, it is also necessary to cite the implementation, on board the target, of specific means making it possible to reduce the level of radiation emitted, in particular, by the propulsion unit or any other hot source.
• DE-A-2 509 539 also discloses a device for ejecting a liquid to produce, at a certain distance and as quickly as possible, an opaque fog curtain.
• this document essentially recommends using chlorosulphonic acid or titanium tetrachloride as liquid and, to amplify the fog effect, it is recommended to use a second material with the aforementioned liquids. consisting of an amine such as triethylamine, in an adequate proportion.
• the invention also provides means for dispersing jointly, in the atmosphere, boron trichloride and water stored separately in one or more containers.
• the Applicant has undertaken research to find new bodies which could produce screens which are opaque to optical and thermal radiation.
• a liquid or gaseous aerosol such as boron trichloride (BCf 3 ) is dispersed in the atmosphere, a "cloud" is produced which has the property of attenuating strongly optical and IR radiation.
• BCf 3 boron trichloride
• boron trichloride is a product obtained industrially and commercially available; at atmospheric pressure, it occurs in the liquid state, between -107 ° C and 12.5 ° C, its density being approximately 1.4.
• Various means of diffusing BCl 3 have been produced , in particular means making it possible to continuously diffuse the SCf a into the atmosphere, with the aim of maintaining the absorbent cloud thus formed and means making it possible to create almost instantly an absorbent cloud with a more limited lifespan.
• an increase in the rate atmospheric humidity tended to increase the value of the cloud attenuation factor. It is assumed that the boron trichloride diffused into the atmosphere is hydrolyzed by water vapor in suspension, according to the formula. :
• measuring equipment has been placed making it possible to detect, process and visualize the echo signals backscattered by the propagation medium (atmosphere) and the target.
• the main parameters such as the power radiated by the laser illuminator, the sensitivity of the measurement equipment, were adjusted so as to obtain a target echo whose signal / noise ratio is Student.
• a container containing BC1 3 was placed between the points A and B in the field.
• a container is deposited in which the aerosol is stored in liquid or gaseous form, this container comprising a diffusion nozzle equipped with an opening means which can be operated manually or remotely automatically, for example, under the action of a signal supplied by an alert receiver.
• the container containing the aerosol is launched by the target itself or by an unmarked means; the container then constitutes a projectile the active charge of which is the aerosol; this projectile is equipped, for example, with a timable, proximity or impact rocket making it possible to trigger a suitable pyrotechnic or mechanical device which causes the release of the aerosol at the chosen point of the atmosphere and its subsequent diffusion.
• the aerosol is contained in a bomb equipped with a braking parachute and with an opening means.
• a device for simultaneously diffusing the aerosol and water essentially comprises the following elements: a first reservoir containing the aerosol in a liquid or gaseous form and a second reservoir containing water, each reservoir is provided with a conduit fitted with an opening valve, the outputs of these conduits are connected to a common diffuser. To ensure the ejection of the water contained in the second tank, the latter is kept under pressure by means of an auxiliary tank containing a gas under pressure or pressurized pyrotechnically.
• the pressure supplied by the auxiliary gas reservoir can be applied to the first reservoir containing the aerosol.
• these two products are enclosed in two compartments of a single container and means, for example, pyrotechnic means, ensure the rupture of the compartments and the joint release of the two products and their dispersion under the effect of the heat flow resulting from the operation of the pyrotechnic charge.
• the nozzle of a propellant and the jet of gas which escape therefrom are a source of radiation whose energy is exploited by the self-guiding means. electro-optics of tactical missiles. If one or a plurality of diffusers supplied by a source of boron trichloride are present at the periphery of the nozzle of the propellant, there is produced, at the outlet of this nozzle, a medium capable of very considerably reducing the thermal radiation of the propellant.
• the flow rate of the boron trichloride source can be controlled by an alert detector which detects the approach of an offensive tactical missile, by a program or manually by the pilot.
• the method can be used in conjunction with active means such as emissive lures.
• active means such as emissive lures.
• the invention finds its application in an electro-optical countermeasuring device comprising means for diffusing boron trichloride alone or simultaneously with water; these bodies can be contained in separate containers or in watertight compartments of a single container such as the interior of a projectile.
• the release of boron trichloride and, optionally, of water if necessary, can be ensured by pyrotechnic means arranged outside the containers.
• the diffusion means can be constituted by diffusers arranged in the vicinity of the nozzle of this propellant.
• a device for electro-optical countermeasures implementing the opacification method makes it possible to ensure: the punctual protection of a target, the camouflage of a group of extended objectives, the reduction of the radiation level from a heat source, including the radiation level from a vehicle's propulsion system.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Radar, Positioning & Navigation (AREA)
• Remote Sensing (AREA)
• Aviation & Aerospace Engineering (AREA)
• Combustion & Propulsion (AREA)
• Chemical & Material Sciences (AREA)
• Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
• Optical Radar Systems And Details Thereof (AREA)
• Glass Compositions (AREA)
• Surface Treatment Of Glass (AREA)
• Laminated Bodies (AREA)
• Optical Filters (AREA)
• Manufacturing Optical Record Carriers (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (3)

Family

ID=9225807

Family Applications (1)

Country Status (20)

Families Citing this family (12)

Family Cites Families (9)

• 1979
  • 1979-05-23 FR FR7913195A patent/FR2457474A1/fr active Granted
• 1980
  • 1980-05-12 FI FI801536A patent/FI801536A/fi not_active Application Discontinuation
  • 1980-05-12 DE DE8080400647T patent/DE3066473D1/de not_active Expired
  • 1980-05-12 AT AT80400647T patent/ATE6174T1/de not_active IP Right Cessation
  • 1980-05-12 EP EP80400647A patent/EP0020217B2/fr not_active Expired - Lifetime
  • 1980-05-20 ZA ZA00802997A patent/ZA802997B/xx unknown
  • 1980-05-20 ES ES491624A patent/ES8103834A1/es not_active Expired
  • 1980-05-20 EG EG315/80A patent/EG14065A/xx active
  • 1980-05-20 YU YU01345/80A patent/YU134580A/xx unknown
  • 1980-05-20 US US06/151,590 patent/US4328117A/en not_active Expired - Lifetime
  • 1980-05-20 BR BR8003148A patent/BR8003148A/pt not_active IP Right Cessation
  • 1980-05-20 IL IL60130A patent/IL60130A/xx unknown
  • 1980-05-22 CA CA000352515A patent/CA1147545A/en not_active Expired
  • 1980-05-22 NO NO801539A patent/NO147350C/no unknown
  • 1980-05-22 DK DK223980A patent/DK151060C/da not_active IP Right Cessation
  • 1980-05-22 GR GR62028A patent/GR68437B/el unknown
  • 1980-05-22 PT PT71291A patent/PT71291A/pt unknown
  • 1980-05-22 TR TR21717A patent/TR21717A/xx unknown
  • 1980-05-23 AR AR281171A patent/AR221939A1/es active
  • 1980-05-23 JP JP6881480A patent/JPS55165500A/ja active Pending

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