Spectral responsivity bilateral comparison completed. (General Developments).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. and the National Research Council of Canada The National Research Council Canada (NRC) is Canada's leading organization for scientific research and development. History NRC was established in 1916, mainly to advise the government. Then, in the early 1930s, laboratories were built in Ottawa. (NRC) recently completed a bilateral comparison of routine spectral responsivity calibrations from 250 nm to 1800 nm, using silicon, germanium, and indium gallium arsenide Indium gallium arsenide (InGaAs) is a semiconductor composed of indium, gallium and arsenic. It is used in high-power and high-frequency electronics because of its superior electron velocity with respect to the more common semiconductors silicon and gallium arsenide. photodiodes as transfer standards. The comparison was carried out to test the level of agreement for routine detector calibrations between the two laboratories and to support the uncertainties quoted by NIST and NRC in Appendix C of the Mutual Recognition Arrangement (MRA MRA Medical Record Administrator. MRA Magnetic resonance angiography, see MR angiography ) drawn up by the International Committee of Weights and Measures weights and measures, units and standards for expressing the amount of some quantity, such as length, capacity, or weight; the science of measurement standards and methods is known as metrology. (CIPM). Excellent agreement was shown between the two laboratories. The differences between NIST and NRC were within the combined uncertainties throughout the spectral range. In particular, in the range 450 nm to 1000 nm, the agreement was within [+ or -] 0.2 %, and in the range 900 nm to 1600 nm, the agreement was typically [+ or -] 0.5 %. The results of this intercomparison were presented at the NEWRAD2002 conference, and will be published in the conference proceedings issues of Metrologia. CONTACT: Sally Bruce, (301) 975-2323; sally.bruce@nist.gov. |
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