Measurement of the Boltzmann Constant with Noise Thermometry at NIM

Published

August 24, 2014

Author(s)

Jifeng Qu, Kunli Zhou, Horst Rogalla, Samuel Benz, Yunfeng Fu

Abstract

Since 2010 we have been developing a quantum-voltage-calibrated Johnson noise thermometer at NIM to measure the Boltzmann constant k. With recent improvements in grounding and shielding of the electronics, and matching of the noise sources and transmission lines, the effects of electromagnetic interference and spectral aberrations were greatly reduced. Measurements for about 140 hours integrating period resulted in measured value of k = 1.380648x10^-23 J/K and a relative uncertainty of 7.8x10^-6, which is at a relative offset of -0.6x10^-6 from the CODATA 2010 value of k.

Proceedings Title

Conference on Precision Electromagnetic Measurements Conference Digest

Volume

2

Conference Dates

August 24-29, 2014

Conference Location

Rio de Janeiro, BR

Conference Title

Conference on Precision Electromagnetic Measurements

Pub Type

Conferences

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Keywords

Boltzmann constant, Correlation, Josephson arrays, Noise, Quantization, Thermometry

Citation

Qu, J. , Zhou, K. , Rogalla, H. , Benz, S. and Fu, Y. (2014), Measurement of the Boltzmann Constant with Noise Thermometry at NIM, Conference on Precision Electromagnetic Measurements Conference Digest, Rio de Janeiro, BR, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=915384 (Accessed October 10, 2025)