Flat frequency response in the electronic measurement of the Boltzmann constant

Published

July 1, 2012

Author(s)

Jifeng Qu, Samuel Benz, Yang Fu, Jianqiang Zhang, Horst Rogalla, Alessio Pollarolo

Abstract

A new quantum voltage calibrated Johnson noise thermometer (JNT) was developed at NIM to demonstrate the electrical approach that determines the Boltzmann constant k by comparing electrical and thermal noise power. A measurement with integration period of 10 hours and bandwidth of 640 kHz results in relative offset of 0.5106 from the current CODATA value of k, and type A relative standard uncertainty of 23106. The quadratic fitting parameters of the ratio spectrum show a flat frequency response with respect to the measurement bandwidth. This flat response is a dramatic improvement compared to the response produced by the NIST JNT system that dominated the relative combined uncertainty of previous measurements of k.

Proceedings Title

Conference on Precision Electromagnetic Measurements Conference Digest

Volume

28

Conference Dates

July 1-6, 2012

Conference Location

National Harbor, MD, US

Conference Title

Conference on Precision Electromagnetic Measurements

Pub Type

Conferences

Download Paper

https://doi.org/10.1109/CPEM.2012.6250879

Local Download

Keywords

Boltzmann equation, Correlation, Digital-analog conversion, Josephson arrays, Measurement units, Noise Measurement, Quantization, Signal synthesis, Standards, Temperature

Citation

Qu, J. , Benz, S. , Fu, Y. , Zhang, J. , Rogalla, H. and Pollarolo, A. (2012), Flat frequency response in the electronic measurement of the Boltzmann constant, Conference on Precision Electromagnetic Measurements Conference Digest, National Harbor, MD, US, [online], https://doi.org/10.1109/CPEM.2012.6250879, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=910580 (Accessed October 7, 2025)