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Anechoic chamber absorber and method
| Details |
Inventors: Diaz, Rodolfo E.; Squires, Mark C.; Miller, Michael C.;
Assignee: Northrop Grumman Corporation (Los Angeles, CA)
Primary Examiner: Dang; Khanh
Assistant Examiner:
Attorney, Agent or Firm: Anderson; Terry J., Hoch, Jr.; Karl J.
An EMR-absorbing anechoic chamber absorber (22, 42) uses a block of honeycomb material with a lossy material, such as carbon, applied to the sheets (4) of material from which the honeycomb is made to create wedges (36) or pyramids (44) of lossy material. Preferably, the lossy material is applied to the sheets of material in a repeating wedge-shaped pattern (16) to create the wedges of lossy material within the solid rectangular block of honeycomb material. Parallel, wedge-shaped grooves (43) are formed in the block of honeycomb material to create the pyramids of lossy material. If the lossy material is applied to the entire sheet, a set of parallel, wedge-shaped grooves are formed in the block of honeycomb material to create wedges of lossy material; two sets of parallel, wedge-shaped grooves are formed at 90.degree. angles to one another to create pyramids of lossy material. |
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DETAILED DESCRIPTION The present invention is directed to an anechoic chamber absorber, and method for making the anechoic chamber absorber from honeycomb, which is relatively lightweight, stiff, has low toxicity in the event of fire and can be made to be about one-half the height of conventional foam block absorbers.
Reducing the size of the absorber can drastically reduce the dimension requirements for the basic anechoic chamber room structure and reduces the amount of absorber material which must be used by about 50%.
The anechoic chamber absorber suitable for absorbing electromagnetic radiation is made using a block of honeycomb material.
The honeycomb material includes wedges or pyramids of a lossy material, such as carbon.
The wedges and pyramids can be formed within a rectangular block of honeycomb without the need for machining.
The lossy material is preferably applied to sheets of material from which the honeycomb is made.
If the lossy material is applied to the entire sheet, the wedges or pyramids of lossy material are created by forming a set of parallel, wedge-shaped grooves in the block of honeycomb material to create wedges of lossy material.
Two sets of parallel, wedge-shaped grooves formed at 90.
degree.
angles to one another are used to create pyramids of lossy material.
The lossy material is preferably applied to the sheets of material in a repeating wedge-shaped pattern.
On forming the block of honeycomb material, wedges of lossy material are formed within the solid rectangular block of honeycomb material without the need for cutting wedge-shaped grooves into the block.
To create pyramids of lossy material, wedge-shaped grooves of the honeycomb material are removed from the block of honeycomb material.
The grooves are cut at 90.
degree.
angles to the wedges of lossy material so that truncated wedge-shaped sections of lossy material are removed to create a grooved block of honeycomb material having pyramids of lossy material within the grooved block.
A primary advantage of the invention is the ability to reduce the size of anechoic chamber absorbers from, for example, 6 feet (1
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