Small volume high emissivity infrared calibration source systems and methods
A blackbody surface radiator includes a surface having a plurality of adjacent grooves, each groove extending from a groove bottom to a pair of groove tops, each groove top being common with an adjacent groove, the groove bottoms and groove tops having a width of less than 100 micrometers. A mirror-like emissive coating covers the surface.
1. A blackbody surface radiator comprising:
a surface having a plurality of adjacent grooves, each groove extending from a groove bottom to a pair of groove tops, each groove top being common with an adjacent groove, the groove bottoms and groove tops having a width of less than 100 micrometers, wherein the plurality of grooves are defined at least in part by a first wall and a second wall, wherein the first wall and the second wall have a roughness of less than 250 nanometers average peak to trough height; and,
a mirror-like emissive coating covering the surface.
2. The radiator of claim 1 , wherein the plurality of grooves are concentric.
3. The radiator of claim 1 , wherein the first wall and the second wall extending from the groove bottom to a corresponding one of the groove tops.
4. The radiator of claim 3 , wherein an angle between the groove walls is equal to or less than about 90 degrees.
5. The radiator of claim 4 , wherein an angle between the groove walls is equal to or less than about 45 degrees.
6. The radiator of claim 4 , wherein an angle between the groove walls is equal to or less than about 30 degrees.
7. The radiator of claim 1 , wherein the groove bottoms and groove tops have a width of less than 20 micrometers.
8. The radiator of claim 1 , wherein the grooves are V-shaped.
9. A method for manufacturing a blackbody surface radiator, comprising:
machining a plurality of grooves on a substrate with diamond tooling in which the machining includes machining first and second walls of the grooves, each of the first and second walls having roughness of less than 250 nanometers average peak to trough height; and,
applying a mirror-like emissive coating to the grooves.
10. The method of claim 9 , wherein the machining step includes machining a mirror-like surface on the first and second walls.
11. The method of claim 10 , wherein the applying step includes applying a mirror-like emissive coating on the first and second walls.
12. The method of claim 9 , wherein the first and second walls are disposed less than about 50 degrees apart.
13. An infrared calibration radiator, comprising:
a substrate;
a plurality of adjacent grooves formed in the substrate, each groove having a first wall and a second wall opposite the first wall, wherein the first wall and the second wall extend from a common groove bottom to respective groove tops common with adjacent grooves, wherein the groove walls in a coated condition and/or an uncoated condition have a surface roughness of 50-250 nanometers average peak to trough height or less, wherein the groove bottoms and groove tops have a width less than about 100 microns; and wherein each groove wall is constructed to provide high specular reflection; and
a coating disposed over the groove walls, wherein the coating is configured to provide high specular reflection.
14. The infrared calibration radiator of claim 13 , wherein the groove bottoms and/or the groove tops have a width less than about 50 microns.
15. The infrared calibration radiator of claim 14 , wherein the groove bottoms and/or the groove tops have a width less than about 50 microns in the as-formed condition of the grooves.
16. The infrared calibration radiator of claim 14 , wherein the groove walls are mirror like.
17. The infrared calibration radiator of claim 14 , wherein the coating is a high emissivity coating.