NIST obtains microwave images using its near-field range facility. (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. has processed spherical scanning data to obtain a microwave image of a bicycle and a ladder using its spherical near-Field measurement facility. The technique was originally conceived in a NIST theoretical paper, and was implemented on the NIST spherical near-field scanning facility in Boulder. The objective is to develop a method for the precise evaluation of incident electromagnetic fields electromagnetic field Property of space caused by the motion of an electric charge. A stationary charge produces an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. A changing magnetic field also produces an electric field. in the quiet (measurement) zones of anechoic chambers, and far-field and compact antenna measurement Antenna measurement techniques refers to the art of testing antennas to ensure that the antenna meets specifications or simply to characterize it. Typical parameters of antennas are gain, radiation pattern, beamwidth, polarization, and impedance. ranges. The microwave image was obtained at 16 GHz and compared to an optical image. The microwave image of the bicycle shows considerable structural detail. For example, the wheels, saddle, fork, and frame are visible. While this image was focused on the bicycle, the horn antenna The Horn Antenna, at Bell Telephone Laboratories in Holmdel, New Jersey, is listed as a National Historic Landmark because of its association with the research work of two radio astronomers, Arno Penzias and Robert Wilson. that is the source of the microwave signals and a step ladder are out of focus but visible in the microwave picture. CONTACTS: Andy Repjar, (303) 497-5703; repjar@ boulder.nist.gov. |
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