Claims
- 1. An infrared lamp of broad spectral band output, comprising:
- a hollow body having an open end and a closed end,
- a filament means including filament pins, extending through the body, said filament emitting broad band infrared radiation when an electrical current is passed therethrough,
- an optical element window disposed on said hollow body and defining an aperture for transmission of radiation from said filament,
- an indium alloy junction comprising indium between said window and said body to seal said window to said body,
- a pliable coating overlaying said indium alloy junction and at least part of said body, and
- a gas contained in said hollow body in contact with said filament to control temperature and to prevent deterioration of said filament.
- 2. An infrared lamp according to claim 1, and further comprising:
- reflector means having the focus thereof at the filament and having an open end facing said window, whereby a shaped beam is radiated therethrough.
- 3. An infrared lamp according to claim 2, wherein said reflector means is a parabola to produce a substantially collimated beam.
- 4. An infrared lamp according to claim 2, wherein said reflector means is hemispherical.
- 5. An infrared lamp according to claim 2, wherein said reflector means is an ellipse having the focus thereof at said filament and the major axis thereof extending parallel to the filament.
- 6. An infrared lamp according to claim 2, wherein said reflector means is configured to shape the radiation wave front emitted from the lamp.
- 7. An infrared lamp according to claim 1, and further comprising:
- a selective band transmissive spectral filter, whereby a coherent selected band spectral output is radiated by the lamp.
- 8. An infrared lamp according to claim 2, and further comprising:
- a selective band transmissive spectral filter, whereby a coherent selected band spectral output is radiated by the lamp.
- 9. An infrared lamp according to claim 3, and further comprising:
- a selective band transmissive spectral filter, whereby a coherent selected band spectral output is radiated by the lamp.
- 10. An infrared lamp according to claim 9, wherein said transmissive spectral filter is ZnSe.
- 11. An infrared lamp according to claim 9, wherein said transmissive spectral filter is ZnS.
- 12. An infrared lamp according to claim 9, wherein said transmissive spectral filter is sapphire.
- 13. An infrared lamp according to claim 9, wherein said transmissive spectral filter is germanium.
- 14. An infrared lamp according to claim 1, wherein:
- said window has a broad band output and an infrared cut-off wavelength, whereby radiation at wavelengths longer than the cut-off wavelength is attenuated.
- 15. An infrared lamp according to claim 14, wherein:
- said window has a broad band output and an infrared cut-off wavelength, and
- the window is quartz.
- 16. An infrared lamp according to claim 7, wherein said optical element window is a convex lens, whereby the radiation is focused outside the body of the lamp.
- 17. An infrared lamp according to claim 8, wherein said optical element window is a convex lens, whereby the radiation is focused outside the body of the lamp.
- 18. An infrared lamp according to claim 7, wherein said optical element window is a compound lens.
- 19. An infrared lamp according to claim 8, wherein said optical element window is a compound lens.
- 20. An infrared lamp according to claim 7, wherein said optical element window is a reticle.
- 21. An infrared lamp according to claim 8, wherein said optical element window is a reticle.
- 22. An infrared lamp according to claim 7, wherein said optical element window is a broad band filter.
- 23. An infrared lamp according to claim 8, wherein said optical element window is a broad band filter.
- 24. An infrared lamp according to claim 1, and further including:
- polarization means at the lamp output, and
- electrical means for controlling the transmission of the polarization means to modulate lamp output.
- 25. An infrared lamp according to claim 24, wherein the polarization means comprise films at said window.
- 26. An infrared lamp having a narrow spectral band output and a substantially collimated beam, comprising:
- a quartz tube body, said body having filament pins extending through the body,
- a transmissive spectral filter sealed to the body defining a window for radiation,
- an indium alloy junction sealing said filter to the body,
- a pliable overcoating overlying the seal junction and at least part of the quartz body,
- filament means in the lamp and extending through the closed end of the quartz tube body, the filament means being at the focus of a deep parabolic reflector with substantially parallel sides near its open end,
- an inert gas in the lamp to control heat transfer from the filament, and
- means for energizing said filament, whereby a narrow band collimated beam of infrared radiation of specified wavelength band is obtained for communications.
- 27. An infrared lamp according to claim 24 and further including:
- rotating mirror means directing the radiation output from said lamp along azimuths over 360 degrees oriented orthogonally to the lamp.
- 28. An infrared lamp according to claim 24 and further including:
- shutter means interrupting the radiation emitted from said lamp to pass coded information.
- 29. An infrared lamp according to claim 26, and further including:
- polarization means at the lamp output, and
- electrical means for controlling the transmission of the polarization means to modulate lamp output.
- 30. An infrared lamp according to claim 29, wherein the polarization means comprise films at said window.
- 31. An infrared lamp according to claim 1, wherein said hollow body is formed of glass.
- 32. An infrared lamp according to claim 1, wherein said hollow body is formed of quartz.
- 33. An infrared lamp according to claim 1, wherein said hollow body is formed of sapphire.
- 34. An infrared lamp according to claim 1, wherein said hollow body is formed of alumina ceramic AlO .
- 35. An infrared lamp according to claim 1, wherein said hollow body is formed of ceramic BeO.
- 36. An infrared lamp according to claim 1, wherein said hollow body is formed of metal.
- 37. An infrared lamp according to claim 1, and further comprising:
- means surrounding said lamp and having a low emissivity in contrast with the emissivity of the lamp, whereby the detectability of the lamp is enhanced.
Parent Case Info
This is a continuation of application Ser. No. 07/799,036 filed on Nov. 27, 1991, now abandoned.
US Referenced Citations (5)
Continuations (1)
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Number |
Date |
Country |
Parent |
799036 |
Nov 1991 |
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