Process and screen for disturbing the transmission of electromagnetic radiation particularly infra-red radiation

• US 5,078,462 A
• Filed: 08/09/1990
• Issued: 01/07/1992
• Est. Priority Date: 11/25/1986
• Status: Expired due to Term

• Current Assignee: Philippe E. Gravisse
• Original Assignee: Philippe E. Gravisse
• Inventors: Gravisse, Philippe E.
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): PARSONS, DAVID
• Application Number:
  US07/565,893
• Time in Patent Office: 516 Days
• Field of Search: 350/1.1, 350/1.6, 350/311, 250/483.1, 250/472.1
• US Class Current: 359/359
• CPC Class Codes: A01G 9/1438 Covering materials therefor; Materials for protective coverings used for soil and plants, e.g. films, canopies, tunnels or cloches
• CPC Class Codes: F41H 3/00 Camouflage, i.e. means or methods for concealment or disguise for vessels B63G8/34, B63G13/02 ; sound camouflage, i.e. simulating gun fire noise, F41A33/04; dummy or decoy targets F41J; chaff per se F41J2/00; ammunition for dispensing chaff F42B5/15, F42B12/70; radar absorbing fabrics H01Q17/005
• CPC Class Codes: G02B 5/20 Filters polarising elements G02B5/30
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: Y02A 40/25 Greenhouse technology, e.g. cooling systems therefor

Abstract

Process for disturbing the transmission of electromagnetic radiation emitted by a source within a predetermined wavelength band, for reception by a receiver designed to detect signals situated in said band, characterized by a screen (3) placed between said source (1) and said receiver (4), which absorbs at least part of the radiation emitted on said wavelength band and re-emits it on wavelengths outside said band. Furthermore, a screen for implementing this process.

Claims

1. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said source is a heat generating source and said receiver and infrared detector.

2. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen absorbs infrared radiation within a wavelength band less than 2 micrometers and re-emits it within the wavelength band comprised between 2 and 12 micrometers.

3. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said source comprises a radiation generator (9) directing radiation toward an object and said receiver comprises a receiver (14) for detecting radiation reflected from said object, said generator and receiver being disposed on the same side of said screen and on the opposite side of said screen from said object.

4. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein said doping substances constitute at least one light cascade, wherein the absorption band of the light cascade is comprised of wavelengths from 2 to 12 micrometers and wherein the emission band is located in wavelengths higher than 12 micrometers.

5. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein said doping substances constitute at least one light cascade, wherein the absorption band of the light cascade is located in wavelengths smaller than 2 micrometers while the emission band is located in wavelengths comprised between 2 and 12 micrometers.

6. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein said doping substances comprise at least two materials of the following chemical groups:

hydroxyl materials with ketone groups, amino groups with double carbonated linking, amino groups associated with quaternary aminos, amino groups associated with quarternary aminos and ketone groups, amino groups associated with a ketone group, benzene-cyclane groups, linked phenyl-benzene groups, double linking groups connecting aromatic cycles, associated nitrile groups.

7. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein the doping substances are inserted by chemical grafting.

8. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein said organic matrix comprises at least one of the following polymers or copolymers:

vinyl copolymers, polyethylene, polyethylene-PMMA copolymers, polyethylene-polystyrene copolymers, PMMA-EVA-polystyrene copolymers, low-density polyethylene, polyethylene-polybutyl-butyl-vinyl-acetate, low-density ethyl-vinyl-acetate, polystyrene, PPMA-polyethylene, polyethylene-ethyl-vinyl-acetate, PMMA-ethyl-vinyl-acetate, acetate, polyethylene-acryl acid-modified acrylic, polyureanidine, polytetrafluorotene, polyfluorotene-PMMA.

9. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, and wherein said screen comprising an absorption layer, a reflection layer and an absorption/re-emission layer.

10. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein said screen also comprises doping substances forming light cascades the absorption band of which substantially covers the solar radiation spectrum while the emission band of said light cascade solely covers the wavelength bands promoting plant photosynthesis.

11. The screen of claim 10, wherein the light cascades absorbs radiation of a wavelength between 8 and 12 micrometers.

12. The screen of claim 11, designed to disturb infrared autodirectors, wherein the light cascades have an absorption band ranging from 3 to 5 micrometers and a re-emission band ranging from 5 to 8 micrometers.

13. An apparatus for disturbing the transmission of radiation of a predetermined wavelength from a source of said radiation to a receiver sensitive to a frequency band including said predetermined frequency, said apparatus comprising a screen disposed between said source and receiver for absorbing at least a portion of said radiation and re-emitting radiation in a wavelength outside of said frequency band, wherein said screen is formed of an organic matrix comprising a series of luminescent or scintillating doping substances, wherein the doping substances also comprise at least one of the following substances:

tri-chloro-methacrylate, di-benzatron-oxybenzanyle and di-oxybenzatron.