APPLICATIONS OF THERMAL AND QUANTIZED VOLTAGE NOISE FOR INTRINSIC TEMPERATURE STANDARDS

Published

March 18, 2011

Author(s)

Weston L. Tew, Samuel P. Benz

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.

Proceedings Title

Measurement Science Conference 2011

Conference Dates

March 16-18, 2011

Conference Location

Pasadena, CA

Conference Title

Measurement Science Conference

Pub Type

Conferences

Download Paper

Local Download

Keywords

noise thermometry, Johnson noise, ac Josephson standard, intrinsic standards

Citation

Tew, W. and Benz, S. (2011), APPLICATIONS OF THERMAL AND QUANTIZED VOLTAGE NOISE FOR INTRINSIC TEMPERATURE STANDARDS, Measurement Science Conference 2011, Pasadena, CA, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=907802 (Accessed October 14, 2025)