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NIST Authors in Bold
|Author(s):||Jifeng Qu; Samuel P. Benz; Yang Fu; Jianqiang Zhang; Horst Rogalla; Alessio Pollarolo;|
|Title:||Flat frequency response in the electronic measurement of the Boltzmann constant|
|Published:||July 01, 2012|
|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 0.5106 from the current CODATA value of k, and type A relative standard uncertainty of 23106. 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.|
|Conference:||Conference on Precision Electromagnetic Measurements|
|Proceedings:||Conference on Precision Electromagnetic Measurements Conference Digest|
|Pages:||pp. 216 - 217|
|Location:||National Harbor, MD|
|Dates:||July 1-6, 2012|
|Keywords:||Boltzmann equation, Correlation, Digital-analog conversion, Josephson arrays, Measurement units, Noise Measurement, Quantization, Signal synthesis, Standards, Temperature|
|Research Areas:||Instrumentation, Quantum Devices, Quantum Electrical Measurements, Measurements|
|DOI:||http://dx.doi.org/10.1109/CPEM.2012.6250879 (Note: May link to a non-U.S. Government webpage)|
|PDF version:||Click here to retrieve PDF version of paper (208KB)|