NIST performs electromagnetic shielding effectiveness tests on a commercial aircraft. (News Briefs).NIST (National Institute of Standards & Technology, Washington, DC, www.nist.gov) The standards-defining agency of the U.S. government, formerly the National Bureau of Standards. It is one of three agencies that fall under the Technology Administration (www.technology. recently performed electromagnetic shielding Electromagnetic shielding is the process of limiting the flow of electromagnetic fields between two locations, by separating them with a barrier made of conductive material. effectiveness tests on a commercial aircraft using NIST designed broadband horn antennas and specialized time domain measurement methodology. The information gained in this effort is being used to develop low-cost and efficient measurement techniques for in situ In place. When something is "in situ," it is in its original location. testing of aircraft.
Shielding effectiveness measurements are performed to quantify the electromagnetic fields coupled into an aircraft from an external source, or conversely, internal to external coupling. It is best is to measure an aircraft at an open area test site. However, taking an aircraft out of the production chain is extremely costly for the aircraft industry. Continuous wave measurements made in a hanger or production facility suffer from unwanted reflections that make data interpretation difficult. Thus, the aircraft industry is interested in time domain methods that enable extraneous ex·tra·ne·ous
1. Not constituting a vital element or part.
2. Inessential or unrelated to the topic or matter at hand; irrelevant. See Synonyms at irrelevant.
3. reflections due to hanger walls to be windowed Win´dowed
a. 1. Having windows or openings. out using gating techniques.
NIST engineers used time domain methodology developed at NIST to measure an aircraft in a paint hanger along the production line. In addition, NIST has developed a joint time-frequency analysis tool that will be used to extract critical cavity decay characteristics useful in aircraft shielding studies. The Naval Surface Weapons Center and a private company sponsor this effort.
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