The Development of a Practical, Drift-Free, Johnson-Noise Thermometer for Industrial Applications

Bramley, Paul; Cruickshank, David; Pearce, J. V.

doi:10.1007/s10765-016-2156-8

Cited by 19 publications

(14 citation statements)

References 9 publications

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“…In the longer term the kelvin redefinition, may lead to the advent of practical primary ther-mometry. Advances in practical Johnson Noise thermometry [12] are an early example. As insitu practical primary thermometry becomes a reality then the need to calibrate temperature sensors would ultimately be un-necessary.…”

Section: Impact Of the Kelvin Redefinitionmentioning

confidence: 99%

Plenary Talk 4 - Progress in Realising the Redefined Kelvin

Machin¹,

Pearce²,

Sadli³

et al. 2021

SMSI 2021 - Plenary Talks

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The redefinition of the SI unit the kelvin in May 2019 opened new possibilities for the realization, dissemination and measurement of temperature. Besides the two practical temperature scales that were in place before the redefinition, now, through the mechanism of the mise en pratique for the definition of the kelvin, temperature can be realized and disseminated through primary thermometry approaches with direct traceability to the redefined kelvin. Initial progress towards realizing the redefined kelvin will be discussed, with emphasis on temperatures >1235 K and <25 K.

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Section: Impact Of the Kelvin Redefinitionmentioning

confidence: 99%

Plenary Talk 4 - Progress in Realising the Redefined Kelvin

Machin¹,

Pearce²,

Sadli³

et al. 2021

SMSI 2021 - Plenary Talks

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“…3. Effect of sensor resistance on the measurement error, for two different values of the sense resistance [18]. Colour corresponds to the magnitude of the error, ranging from 0 % (blue) to 0.1 % (red).…”

Section: New Jnt Measurement Topologymentioning

confidence: 99%

“…A first description of the practical Johnson noise thermometer was presented at the ANIMMA 2015 conference [16,17] and some more recent developments have been presented in [18]. In this paper we summarise the key developments since 2015.…”

mentioning

confidence: 99%

Development of a driftless Johnson noise thermometer for nuclear applications

Pearce

Bramley²,

Cruickshank³

2020

EPJ Web Conf.

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Existing temperature sensors such as thermocouples and platinum resistance thermometers suffer from calibration drift, especially in harsh environments, due to mechanical and chemical changes (and transmutation in the case of nuclear applications). A solution to the drift problem is to use temperature sensors based on fundamental thermometry (primary thermometers) where the measured property is related to absolute temperature by a fundamental physical law. A Johnson noise thermometer is such a sensor and uses the measurement of the extremely small thermal voltage noise signals generated by any resistive element to determine temperature using the Johnson-Nyquist equation. A Johnson noise thermometer never needs calibration and is insensitive to the condition of the sensor material, which makes it ideally suited to long-term temperature measurement in harsh environments. These can include reactor coolant circuits, in-pile measurements, nuclear waste management and storage, and severe accident monitoring. There have been a number of previous attempts to develop a Johnson noise thermometer for the nuclear industry, but none have achieved commercialization because of technical difficulties. We describe the results of a collaboration between the National Physical Laboratory and Metrosol Limited, which has led to a new technique for measuring Johnson noise that overcomes the previous problems that have prevented commercialization. The results from a proof-of-principle prototype that demonstrates performance commensurate with the needs of nuclear applications is presented, together with details of progress towards the commercialization of the technology. The development partners have effected a step change in the application of primary thermometry to industrial applications and seek partners for field trials and further exploitation.

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“…They are currently working with a small company to develop practical noise thermometry. A prototype has been demonstrated and work is under way to turn this into a commercial product.…”

Section: The Realization Of the New Kelvinmentioning

confidence: 99%

The Boltzmann Constant for the Definition and Realization of the Kelvin

Fischer

2018

Annalen der Physik

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In November 2018, the four base units, kilogram, ampere, kelvin, and mole, of the International System of Units (SI) are redefined in terms of fundamental physical constants. The redefinition comes into force on World Metrology Day, 20 May 2019. The kelvin, the base unit of thermodynamic temperature, from then is to be founded on a fixed numerical value of the Boltzmann constant. Herein, the change in the definition of the kelvin and the consequences for practical temperature measurement are explained. The primary thermometry methods applied to determine the numerical value of the Boltzmann constant for the redefinition are reviewed. The prospects for the future application of these methods are outlined.

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The Development of a Practical, Drift-Free, Johnson-Noise Thermometer for Industrial Applications

Cited by 19 publications

References 9 publications

Plenary Talk 4 - Progress in Realising the Redefined Kelvin

Plenary Talk 4 - Progress in Realising the Redefined Kelvin

Development of a driftless Johnson noise thermometer for nuclear applications

The Boltzmann Constant for the Definition and Realization of the Kelvin

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