EP0100124A1 - Système optique d'autodirecteur à imagerie - Google Patents

Système optique d'autodirecteur à imagerie Download PDF

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Publication number
EP0100124A1
EP0100124A1 EP83201067A EP83201067A EP0100124A1 EP 0100124 A1 EP0100124 A1 EP 0100124A1 EP 83201067 A EP83201067 A EP 83201067A EP 83201067 A EP83201067 A EP 83201067A EP 0100124 A1 EP0100124 A1 EP 0100124A1
Authority
EP
European Patent Office
Prior art keywords
optical
axis
detectors
missile
seeker
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Withdrawn
Application number
EP83201067A
Other languages
German (de)
English (en)
French (fr)
Inventor
Fernand René Loy
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telecommunications Radioelectriques et Telephoniques SA TRT
Koninklijke Philips NV
Original Assignee
Telecommunications Radioelectriques et Telephoniques SA TRT
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Telecommunications Radioelectriques et Telephoniques SA TRT, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Telecommunications Radioelectriques et Telephoniques SA TRT
Publication of EP0100124A1 publication Critical patent/EP0100124A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G7/00—Direction control systems for self-propelled missiles
    • F41G7/20—Direction control systems for self-propelled missiles based on continuous observation of target position
    • F41G7/22—Homing guidance systems
    • F41G7/2273—Homing guidance systems characterised by the type of waves
    • F41G7/2293—Homing guidance systems characterised by the type of waves using electromagnetic waves other than radio waves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G7/00—Direction control systems for self-propelled missiles
    • F41G7/20—Direction control systems for self-propelled missiles based on continuous observation of target position
    • F41G7/22—Homing guidance systems
    • F41G7/2213—Homing guidance systems maintaining the axis of an orientable seeking head pointed at the target, e.g. target seeking gyro
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41G—WEAPON SIGHTS; AIMING
    • F41G7/00—Direction control systems for self-propelled missiles
    • F41G7/20—Direction control systems for self-propelled missiles based on continuous observation of target position
    • F41G7/22—Homing guidance systems
    • F41G7/2253—Passive homing systems, i.e. comprising a receiver and do not requiring an active illumination of the target

Definitions

  • the invention relates to an optical seeker optical system comprising an optical field scanning device mounted on a gimbal mount secured to the missile gyroscope and a system for detecting the image of the optical device constituted by a cart of detectors.
  • Optical seeker optical systems are known in which the analysis of the scene is obtained by means of a circular scan.
  • the rotation of an optical element such as a dihedral or a Péchan prism produces the rotation of the image of the scene relative to a strip of detectors (see for example French patent n ° 2 481 794 ).
  • the object of the invention is to propose a system which makes it possible to separate the detectors from the gyroscope.
  • the optical system of seeker imaging according to the present invention is remarkable in that said strip of detectors is arranged outside the gyroscope, mounted perpendicular to the axis of the missile, kept fixed relative to the; structure of the missile and coupled to one end of a flexible bundle of arranged optical fibers, the other end of which is arranged in the focal plane of the optical scanning device and integral with said device.
  • An embodiment of the coupling of said array of detectors to said end of the bundle of optical fibers is obtained by means of an image transport device, integral with the structure of the missile and forming the image of said strip on said end of the bundle of optical fibers, so that an optical fiber corresponds to a detector.
  • a variant of this embodiment consists in bringing each fiber end directly into contact with the surface of the detector which corresponds to it. In this case, the image transport device is eliminated.
  • FIG. 1 relates to an embodiment of the invention with an optical device for circular scanning of the field integral with a gyroscope not shown in the figure and the center of the gimbals not shown 3 being at the intersection of the axis 1 of the missile and axis 2 of the optical device.
  • This device comprises a converging dioptric or catadioptric optic produced for example in the form of a miroifceoncave 4 fixed relative to the axis 2 and a right dihedral 5 whose edge is perpendicular to the axis 2, the faces of which are also inclined on this axis and which turns only around this axis.
  • the figure is a sectional view through the plane of symmetry perpendicular to the edge of this dihedral.
  • a strip of detectors 6 is mounted in a Dewar vessel 7 cooled by a cryogenic system 8.
  • the output wires of the detectors exit at 9 through the Dewar vessel.
  • the detectors are placed outside the gyroscope and kept fixed relative to the structure of the missile.
  • the detector array is perpendicular to the axis of the missile.
  • An image transport device 10 having the optical axis of the missile axis forms the image of the array of detectors on the end 12 of a bundle of optical fibers so that each detector corresponds: a single fiber.
  • the fibers are arranged so as to obtain at the end 13 of the bundle a suitable arrangement. Everything happens as if the array of detectors 6 was positioned at the end 13 of the beam.
  • optical fibers are bonded together at the two ends 12 and 13 over a length of a few millimeters and are independent for the rest of the bundle so as to obtain a very flexible bundle 11 whose restoring torque is negligible.
  • the end 12 is mounted integral with the image transport device 10 and the Dewar 7 while the end 13 is mounted integral with the optics itself integral with the gyroscope.
  • the small size of the end 13 of the fiber bundle makes it possible to position the dihedral 5 at a very short distance from the focal point of the optical scanning device. Lehedron 5 can therefore be very small. As a result, the central concealment of the concave mirror 4 is much lower than if the detector was located directly at the focus of this mirror and a significant reduction in the mass of the rotating dihedral 5 leading to a simpler resolution of the balancing problems.
  • the rotation of the dihedral can be obtained either by linking the dihedral to the gyroscope router or by driving it by means of a small auxiliary motor.
  • Image transport by means of a bundle of flexible fibers is currently achievable in the visible and near infrared spectrum by means of conventional optical fibers made of plastic, or glass, or silica.
  • optical fibers made of plastic, or glass, or silica.
  • a rotating dihedron is used for the circular analysis of the scene.
  • We could just as easily use another type of optical element to perform the same function such as a Pechan prism or a cylindrical afocal system, these examples not being limiting.
  • each detector of the strip 6 scans a circular band such as the band ⁇ i , when the corresponding end of fiber of the end 13 is located on the axis 2.
  • FIG. 3 schematically represents the coupling between the fiber bundle 11 and the array of detectors 6 in the case where this coupling is carried out by means of an image transport device.
  • the end 13 of the fiber bundle situated in the focal plane of the optical scanning device receives flux coming from the scene at a certain solid angle w i .
  • This flow goes out of a fiber f i at the end 12 of the beam inside a solid angle ⁇ ' i greater than ⁇ i .
  • the optics 10 must be able to collect all the flux, therefore have an opening at least equal to ⁇ i .
  • the image ⁇ i of the end of the fiber f i must be entirely contained in the sensitive surface s. of the corresponding detector so that there is no loss of flux.
  • the magnification of the optics 10 can be arbitrary. It will be adapted to the dimensions of the fibers and detectors. To fix an order of magnitude, we can for example use detectors of 50pm x 50pm and fibers with a diameter of 50 ⁇ m with a magnification equal to unity. A bundle of 30 fibers associated with a strip of 30 detectors is very flexible.
  • the conjugation of the detectors with the end 12 of the beam is easy when an appropriate tool is available.
  • An alternative coupling between the detector and the fiber consists in bringing the fiber into contact with the surface of the detector. In this case, the image transport device 10 is eliminated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Gyroscopes (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
EP83201067A 1982-07-30 1983-07-19 Système optique d'autodirecteur à imagerie Withdrawn EP0100124A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8213359 1982-07-30
FR8213359A FR2531232A1 (fr) 1982-07-30 1982-07-30 Systeme optique d'autodirecteur a imagerie

Publications (1)

Publication Number Publication Date
EP0100124A1 true EP0100124A1 (fr) 1984-02-08

Family

ID=9276498

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83201067A Withdrawn EP0100124A1 (fr) 1982-07-30 1983-07-19 Système optique d'autodirecteur à imagerie

Country Status (2)

Country Link
EP (1) EP0100124A1 (enExample)
FR (1) FR2531232A1 (enExample)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188507A (en) * 1986-03-22 1987-09-30 Diehl Gmbh & Co Target detection mechanism
EP0295152A3 (en) * 1987-06-11 1989-09-06 Mitsubishi Rayon Co. Ltd. Apparatus for following sun light
US4952042A (en) * 1989-06-16 1990-08-28 The Boeing Company Missile seeker head
FR2647894A1 (fr) * 1989-05-30 1990-12-07 Matra Dispositif electro-optique de reconnaissance aerienne
US4987305A (en) * 1988-09-01 1991-01-22 State Of Israel, Atomic Energy Commission, Soreg Nuclear Research Center Infra-red sensing system
DE3925942A1 (de) * 1989-08-07 1991-02-14 Bodenseewerk Geraetetech Kreiselstabilisierter sucher
US7575190B2 (en) * 2001-07-17 2009-08-18 Bae Systems Information And Electronic Systems Integration Inc. Fiber optic laser detection and ranging system

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4054364A (en) * 1976-02-02 1977-10-18 The United States Of America As Represented By The Secretary Of The Navy Apparatus for transmitting light through Cassegrain optics
US4087061A (en) * 1972-05-08 1978-05-02 The United States Of America As Represented By The Secretary Of The Navy Wide angle seeker
FR2434362A1 (fr) * 1978-08-22 1980-03-21 Raytheon Co Chercheur optique en gyroscope libre pour missile ou analogue
US4266173A (en) * 1979-03-15 1981-05-05 The Boeing Company Roll compensated seeker head
FR2481794A1 (fr) * 1980-05-05 1981-11-06 Trt Telecom Radio Electr Dispositif optique d'analyse d'un champ spatial et de localisation angulaire d'un objet rayonnant dans ce champ
EP0050539A1 (fr) * 1980-10-21 1982-04-28 Thomson-Csf Dispositif à imagerie vidéo pour un autodirecteur

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4087061A (en) * 1972-05-08 1978-05-02 The United States Of America As Represented By The Secretary Of The Navy Wide angle seeker
US4054364A (en) * 1976-02-02 1977-10-18 The United States Of America As Represented By The Secretary Of The Navy Apparatus for transmitting light through Cassegrain optics
FR2434362A1 (fr) * 1978-08-22 1980-03-21 Raytheon Co Chercheur optique en gyroscope libre pour missile ou analogue
US4266173A (en) * 1979-03-15 1981-05-05 The Boeing Company Roll compensated seeker head
FR2481794A1 (fr) * 1980-05-05 1981-11-06 Trt Telecom Radio Electr Dispositif optique d'analyse d'un champ spatial et de localisation angulaire d'un objet rayonnant dans ce champ
EP0050539A1 (fr) * 1980-10-21 1982-04-28 Thomson-Csf Dispositif à imagerie vidéo pour un autodirecteur

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2188507A (en) * 1986-03-22 1987-09-30 Diehl Gmbh & Co Target detection mechanism
GB2188507B (en) * 1986-03-22 1990-11-28 Diehl Gmbh & Co A target detection mechanism
EP0295152A3 (en) * 1987-06-11 1989-09-06 Mitsubishi Rayon Co. Ltd. Apparatus for following sun light
US4942292A (en) * 1987-06-11 1990-07-17 Mitsubishi Rayon Co., Ltd. Apparatus for following sun light
US4987305A (en) * 1988-09-01 1991-01-22 State Of Israel, Atomic Energy Commission, Soreg Nuclear Research Center Infra-red sensing system
FR2647894A1 (fr) * 1989-05-30 1990-12-07 Matra Dispositif electro-optique de reconnaissance aerienne
US4952042A (en) * 1989-06-16 1990-08-28 The Boeing Company Missile seeker head
EP0402564A1 (en) * 1989-06-16 1990-12-19 The Boeing Company Missile seeker head
DE3925942A1 (de) * 1989-08-07 1991-02-14 Bodenseewerk Geraetetech Kreiselstabilisierter sucher
US7575190B2 (en) * 2001-07-17 2009-08-18 Bae Systems Information And Electronic Systems Integration Inc. Fiber optic laser detection and ranging system

Also Published As

Publication number Publication date
FR2531232B1 (enExample) 1985-01-18
FR2531232A1 (fr) 1984-02-03

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): DE FR GB IT

17P Request for examination filed

Effective date: 19840302

STAA Information on the status of an ep patent application or granted ep patent

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Effective date: 19860722

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LOY, FERNAND, RENE