Blackbody radiation source

1. A blackbody radiation source comprising:

a blackbody radiation cavity comprising an inner surface;

a plurality of first carbon nanotubes located on the inner surface of the blackbody radiation cavity, wherein an extending direction of each of the plurality of first carbon nanotubes is substantially perpendicular to the inner surface of the blackbody radiation cavity, the inner surface of the blackbody cavity is partially covered by the plurality of first carbon nanotubes, parts of the inner surface not covered by the plurality of first carbon nanotubes are covered by a black coating, and the black coating is a black lacquer mixed with a plurality of second carbon nanotubes.

2. The blackbody radiation source of claim 1 , wherein each of the plurality of first carbon nanotubes comprises an open end, and the open end is away from the inner surface.

3. The blackbody radiation source of claim 1 , wherein a ratio between a surface area of the inner surface covered by the plurality of first carbon nanotubes to the surface area of the inner surface covered by the black coating ranges from 1:9 to 9:1.

4. The blackbody radiation source of claim 1 , wherein a weight percentage of the plurality of second carbon nanotubes in the black lacquer mixed with carbon nanotubes is in a range from 1% to 50%.

5. The blackbody radiation source of claim 1 , wherein the blackbody radiation source further comprises a heating element located on an outer surface of the blackbody radiation cavity.

6. The blackbody radiation source of claim 5 , wherein the heating element comprises a carbon nanotube structure, a first electrode and a second electrode, and the first electrode and the second electrode are spaced apart from each other on a surface of the carbon nanotube structure.

7. The blackbody radiation source of claim 6 , wherein the carbon nanotube structure comprises a plurality of third carbon nanotubes joined end to end and oriented substantially along a same direction, and the plurality of third carbon nanotubes of the carbon nanotube structure extend from the first electrode towards the second electrode.

8. The blackbody radiation source of claim 1 , wherein the inner surface of the blackbody cavity defines a plurality of grooves separated from each other.

9. The blackbody radiation source of claim 8 , wherein each of the grooves is an annular groove, a strip groove, a dot-shaped groove or a spiral groove extending spirally along a axial direction of the blackbody radiation cavity.

10. The blackbody radiation source of claim 1 , wherein the blackbody radiation cavity defines a room.

11. The blackbody radiation source of claim 10 , wherein a cross-sectional shape of the room is circle, ellipse, triangle, or quad.

12. The blackbody radiation source of claim 10 , wherein a shape of a bottom surface of the room is a flat surface, a tapered surface, or a prismatic surface.

13. The blackbody radiation source of claim 1 , wherein the plurality of first carbon nanotubes comprises a first surface and a second surface, the plurality of first carbon nanotubes is oriented from the first surface to the second surface, the first surface is in contact with the inner surface, the second surface is far away from the inner surface, and the second surface comprises a first subsurface and a second subsurface, and the first subsurface faces to the second subsurface.

14. The blackbody radiation source of claim 13 , wherein a plurality of microstructures are formed on the second surface.

15. The blackbody radiation source of claim 14 , wherein the plurality of microstructures comprises a plurality of micro-grooves.

16. The blackbody radiation source of claim 15 , wherein each of the micro-grooves is an annular micro-groove, a strip micro-groove, a dot-shaped micro-groove or a spiral micro-groove extending spirally along an axial of the blackbody radiation cavity.

17. The blackbody radiation source of claim 13 , wherein the plurality of first carbon nanotubes comprises a first amount of carbon nanotubes and a second amount of carbon nanotubes located on different planes.

18. The blackbody radiation source of claim 17 , wherein the first amount of carbon nanotubes is oriented from the first surface to the first subsurface, and the second amount of carbon nanotubes is oriented from the first surface to the second subsurface.