Infrared signal generation from AC induction field heating of graphite foam

Patent metadata

Field	Value
Publication number	US-9906078-B2
Application number	US-201414466544-A
Country	US
Kind code	B2
Filing date	Aug 22, 2014
Priority date	Aug 22, 2014
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A magneto-energy apparatus includes an electromagnetic field source for generating a time-varying electromagnetic field. A graphite foam conductor is disposed within the electromagnetic field. The graphite foam when exposed to the time-varying electromagnetic field conducts an induced electric current, the electric current heating the graphite foam to produce light. An energy conversion device utilizes light energy from the heated graphite foam to perform a light energy consuming function. A device for producing light and a method of converting energy are also disclosed.

First claim

We claim:

1. A magneto-energy apparatus, comprising:
an electromagnetic field source for generating a time-varying electromagnetic field;
a porous graphite foam conductor disposed within the electromagnetic field, the porous graphite foam conductor comprising a plurality of interconnected pores, the pores defined by pore walls having a wall thickness from 50 μm to 100 μm and the porous graphite foam conductor having a porosity of from 67%-89%;
the porous graphite foam conductor when exposed to the time-varying electromagnetic field conducting an induced electric current, the electric current heating the porous graphite foam conductor to produce light.

2. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a thermal conductivity of at least 40 W/mK.

3. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a thermal conductivity of between 40 W/mK-100 W/mK.

4. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a porosity of at least 75%.

5. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a thermal conductivity of at least 220 W/mK.

6. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a thermal conductivity of between 220 W/mK-240 W/mK.

7. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a porosity of at least 69%.

8. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a porosity of between 69%-85%.

9. The magneto-energy apparatus of claim 1 , wherein a specific thermal conductivity of the porous graphite foam conductor is at least 109 W cm 3 /mKg.

10. The magneto-energy apparatus of claim 1 , wherein a specific thermal conductivity of the porous graphite foam conductor is between 109 W cm 3 /mKg-200 W cm 3 /mKg.

11. The magneto-energy apparatus of claim 1 , wherein the time varying electromagnetic field has a frequency of between 25 kHz-180 kHz.

12. The magneto-energy apparatus of claim 1 , wherein the time varying electromagnetic field has a frequency of between 180 kHz-10 MHz.

13. The magneto-energy apparatus of claim 1 , wherein the time varying electromagnetic field has a power of at least 1 kW.

14. The magneto-energy apparatus of claim 1 , wherein the time varying electromagnetic field has a power of between 10 W-20 kW.

15. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor is derived from a pitch selected from the group consisting of petroleum-derived mesophase pitch, petroleum derived isotropic pitch, coal-tar-derived mesophase pitch, synthetic mesophase pitch, and synthetic isotropic pitch.

16. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has an X-ray diffraction pattern as depicted in FIG. 17 .

17. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has a specific thermal conductivity greater than four times that of copper.

18. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor has an X-ray diffraction pattern exhibiting doublet peaks at 2θ angles between 40 degrees and 50 degrees.

19. The magneto-energy apparatus of claim 1 , wherein the energy conversion device is a light bulb.

20. The magneto-energy apparatus of claim 1 , wherein the porous graphite foam conductor is within an electrically non-conductive housing.

21. The magneto-energy apparatus of claim 1 , further comprising a sensor for sensing an energy output from at least one of the porous graphite foam conductor and the energy conversion device, and a feedback control circuit for controlling the time varying electromagnetic field based upon the sensed energy output.

22. A device for producing light, comprising:
an electromagnetic field source for generating a time-varying electromagnetic field;
a porous graphite foam conductor disposed within the electromagnetic field, the porous graphite foam conductor comprising a plurality of interconnected pores, the pores defined by pore walls having a wall thickness from 50 μm to 100 μm and the porous graphite foam conductor having a porosity of from 67%-89%;
the porous graphite foam conductor when exposed to the time-varying electromagnetic field conducting an induced electric current, the electric current heating the porous graphite foam conductor to produce light; and,
a bulb at least partially covering the conductor graphite foam conductor.

23. The device of claim 22 , further comprising a layer of thermal insulative material disposed between the bulb and the electromagnetic field source.

24. The device of claim 22 , further comprising a cover over the bulb.

25. The device of claim 22 , further comprising a sensor for sensing the produced light, and a feedback control circuit for controlling the time varying electromagnetic field based upon the sensed light output.

26. The device of claim 22 , wherein the produced light is visible light.

27. The device of claim 22 , wherein the produced light is infrared light.

28. A method of converting energy, comprising the steps of:
providing an electromagnetic field source for generating a time-varying electromagnetic field;
providing a porous graphite foam conductor disposed within the electromagnetic field, the porous graphite foam conductor comprising a plurality of interconnected pores, the pores defined by pore walls having a wall thickness from 50 μm to 100 μm and the porous graphite foam conductor having a porosity of from 67%-89%;
the porous graphite foam conductor when exposed to the time-varying electromagnetic field conducting an induced electric current, the electric current heating the porous graphite foam conductor to produce light.

29. The method of claim 28 , wherein the energy conversion step is emitting light.

30. The method of claim 29 , wherein the light is visible light.

31. The method of claim 29 , wherein the light is infrared light.

32. The method of claim 28 , wherein the porous graphite foam conductor is heated between 600° C.-1000° C. in 15 seconds.

33. The method of claim 28 , further comprising the step of sensing an energy output from at least one of the porous graphite foam conductor and the energy conversion device, and a feedback control circuit for controlling the time varying electromagnetic field based upon the sensed energy output.

34. The method of claim 33 , wherein the sensed energy output is light.

Assignees

• Ut Battelle Llc
• Spectrum Fml Inc

Inventors

• Klett James W
• Rios Orlando
• Moyers Richard L
• Monk John E
• Kisner Roger

Classifications

• H02J50/20 Primary

  using microwaves or radio frequency waves · CPC title

• C04B35/52

  based on carbon, e.g. graphite · CPC title

• F28F21/02

  of carbon, e.g. graphite · CPC title

• C04B38/0022 Primary

  obtained by a chemical conversion or reaction other than those relating to the setting or hardening of cement-like material or to the formation of a sol or a gel, e.g. by carbonising or pyrolysing preformed cellular materials based on polymers, organo-metallic or organo-silicon precursors · CPC title