WR-22 NOISE-TEMPERATURE MEASUREMENT SERVICE OPENED.

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 completed construction and verification of a new radiometer radiometer (rā'dēŏm`ətər), instrument for detection or measurement of electromagnetic radiation; the term is applied in particular to devices used to measure infrared radiation. system for measuring the noise temperature of sources with WR-22 waveguide waveguide, device that controls the propagation of an electromagnetic wave so that the wave is forced to follow a path defined by the physical structure of the guide. flanges. The system offers continuous frequency coverage of the 40 GHz to 50 GHz portion of the WR-22 band. The lower portion of the band (33 GHz to 40 GHz) can be measured through adapters on the existing WR-28 system. The new WR-22 system is a total-power radiometer, with an internal six-port reflectometer re·flec·tom·e·ter
n.
An instrument for measuring the reflectance of a surface.

Noun 1. reflectometer - a meter that measures the reflectance of a surface to measure relevant reflection coefficients reflection coefficient
n. Symbol
A measure of the relative permeability of a particular membrane to a particular solute. . Its design is similar to that of existing NIST waveguide systems. It is capable of measuring sources with noise temperatures from about 50 K to 15 000 K, with typical relative expanded uncertainties (k = 2) expected to be about 1.6 % or 1.7 % for sources with noise temperatures from 1000 K to about 12 000 K and reflection coefficients of less than about 0.1. With this new WR-22 measurement service and the recent upgrade of its WR-90 service, NIST now offers noise-temperature measurement services for waveguide noise sour ces for any frequency from 8.2 GHz to 65 GHz, with the exception of the 26.01 GHz to 26.5 GHz range of the WR-42 band.

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Publication:	Journal of Research of the National Institute of Standards and Technology
Article Type:	Brief Article
Geographic Code:	1USA
Date:	Nov 1, 2000
Words:	197
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Topics:	Radiometers Design and construction Waveguides Measurement

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