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|Author(s):||Weston L. Tew; Samuel P. Benz;|
|Title:||APPLICATIONS OF THERMAL AND QUANTIZED VOLTAGE NOISE FOR INTRINSIC TEMPERATURE STANDARDS|
|Published:||March 18, 2011|
|Abstract:||The recent advances in ac waveform synthesis using quantized voltage pulses have enabled new methods for the measurement of absolute temperature. At the same time, the increased linearity and sampling rates of digital electronics have established frequency-domain processing as the preferred technique in Johnson noise thermometry (JNT). The spectral-ratio quantum-based JNT developed at NIST has achieved measurement uncertainties as low as 12 μK/K at 273 K and 40 μK/K for temperatures in the range 500 K to 700 K, with even lower uncertainties achievable in the near term. We describe the theory and experimental realization of the quantized voltage noise source (QVNS) and spectral JNT from the metrology standpoint as intrinsic temperature standards. The role of JNT in special point-of-use thermometry applications and future research directions are also discussed.|
|Conference:||Measurement Science Conference|
|Proceedings:||Measurement Science Conference 2011|
|Dates:||March 16-18, 2011|
|Keywords:||noise thermometry, Johnson noise, ac Josephson standard, intrinsic standards,|
|PDF version:||Click here to retrieve PDF version of paper (182KB)|