Johnson Noise Thermometry Measurement of the Boltzmann Constant With a 200 &lt;formula formulatype="inline"&gt;&lt;tex Notation="TeX"&gt;$\Omega$&lt;/tex&gt;&lt;/formula&gt; Sense Resistor

Pollarolo, Alessio; Jeong, Taehee; Benz, Samuel P.; Rogalla, Horst

doi:10.1109/tim.2013.2239033

Cited by 5 publications

(3 citation statements)

References 24 publications

(29 reference statements)

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“…Figure 7b shows the standard deviation of the ratio fit according to the number of chops accumulated. We can see that during the overnight measurement, the standard deviation decreases in an inverse The suitability of the measurements can be indicated by analyzing the dependence of k with the bandwidth of the fitted ratio data as shown in [17,32]. Figure 7c shows the effect of the bandwidth, resulting in that our ratio fit differs by more than 100 ppm among the choices of the frequency bandwidth used in the fitting, which is far larger than the standard deviation of the ratio fit.…”

Section: Initial Measurement Of Kmentioning

confidence: 96%

“…Figure 7c shows the effect of the bandwidth, resulting in that our ratio fit differs by more than 100 ppm among the choices of the frequency bandwidth used in the fitting, which is far larger than the standard deviation of the ratio fit. As explained in [17,32], the k should be ideally flat and be independent of the bandwidth. However, as shown here, our Fig.…”

Section: Initial Measurement Of Kmentioning

confidence: 99%

“…The noise voltage density could be linked to voltage standards, by employing Josephson junction (JJ) arrays as the quantum realization. The National Institute of Standards and Technology (NIST) has been pioneering the method employing JJs as a quantum voltage noise source (QVNS) that generates the calculable and quantum accurate pseudo-noise waveform as an artificial noise used as the reference in measuring the unknown noise [17,[22][23][24][25][26][27][28][29][30][31][32]. The application of QVNS has improved the accuracy of JNT during the past 10 years due to its accuracy in generating artificial noise with uniform spectra as explained in the following sections.…”

Section: Introductionmentioning

confidence: 99%

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Boltzmann Constant Measurements Using QVNS-Based Johnson Noise Thermometry at NMIJ, AIST

et al. 2014

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Among various methodologies of thermodynamic temperature measurements, Johnson noise thermometry (JNT) has an advantage that the structure and size of the temperature sensing probe are similar to conventional probes for contact thermometry. Another distinguishing feature is that the measurements are all electronic. Furthermore, the application of a quantum voltage noise source (QVNS), first introduced by the National Institute of Standards and Technology (NIST), has improved the accuracy of JNT during the past ten years. These developments have been driven under the rationale to determine the Boltzmann constant k, in support of the proposed redefinition of the kelvin, and later to provide practical realization of the kelvin. At NMIJ, AIST, we have been developing a QVNS-based JNT system to first measure the Boltzmann constant and then aim to extend the temperature range to higher temperatures where T − T 123 986 Int J Thermophys (2014) 35:985-998

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Section: Initial Measurement Of Kmentioning

confidence: 96%

Section: Initial Measurement Of Kmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Boltzmann Constant Measurements Using QVNS-Based Johnson Noise Thermometry at NMIJ, AIST

et al. 2014

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Improved electronic measurement of the Boltzmann constant by Johnson noise thermometry

Benz

Pollarolo

et al. 2015

Metrologia

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The unit of thermodynamic temperature, the kelvin, will be redefined in 2018 by fixing the value of the Boltzmann constant, k. The present CODATA recommended value of k is determined predominantly by acoustic gas-thermometry results. To provide a value of k based on different physical principles, purely electronic measurements of k were performed by using a Johnson noise thermometer to compare the thermal noise power of a 200  sensing resistor immersed in a triple-point-of-water cell to the noise power of a quantum-accurate pseudo-random noise waveform of nominally equal noise power. Measurements integrated over a bandwidth of 550 kHz and a total integration time of 33 days gave a measured value of k = 1.3806514(48)10 -23 J/K, for which the relative standard uncertainty is 3.510 -6 and the relative offset from the CODATA 2010 value is +1.910 -6 .

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The Boltzmann project

et al. 2018

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The International Committee for Weights and Measures (CIPM), at its meeting in October 2017, followed the recommendation of the Consultative Committee for Units (CCU) on the redefinition of the kilogram, ampere, kelvin and mole. For the redefinition of the kelvin, the Boltzmann constant will be fixed with the numerical value 1.380 649 × 10−23 J K−1. The relative standard uncertainty to be transferred to the thermodynamic temperature value of the triple point of water will be 3.7 × 10−7, corresponding to an uncertainty in temperature of 0.10 mK, sufficiently low for all practical purposes. With the redefinition of the kelvin, the broad research activities of the temperature community on the determination of the Boltzmann constant have been very successfully completed. In the following, a review of the determinations of the Boltzmann constant k, important for the new definition of the kelvin and performed in the last decade, is given.

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Johnson Noise Thermometry Measurement of the Boltzmann Constant With a 200 <formula formulatype="inline"><tex Notation="TeX">$\Omega$</tex></formula> Sense Resistor

Cited by 5 publications

References 24 publications

Boltzmann Constant Measurements Using QVNS-Based Johnson Noise Thermometry at NMIJ, AIST

Boltzmann Constant Measurements Using QVNS-Based Johnson Noise Thermometry at NMIJ, AIST

Improved electronic measurement of the Boltzmann constant by Johnson noise thermometry

The Boltzmann project

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