Selectivity in measuring the thermodynamic temperature of an ionized gas with a noise thermometer based on a capacity transducer

Korobchenko, Yu. G.; Ivashchenko, Yu. S.

doi:10.1007/bf00831327

Cited by 4 publications

(3 citation statements)

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“…They recorded noise temperatures in the range 1000 K to 1950 K, depending on the combustion conditions, the method of measurement, and the measurement mode. Korobchenk and Ivashchenk later considered how well the measured electron temperature relates to the gas temperature [180].…”

Section: Plasma and Hot Gas Thermometrymentioning

confidence: 99%

Johnson noise thermometry

Benz

Rogalla

et al. 2019

Meas. Sci. Technol.

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Johnson noise thermometers infer thermodynamic temperature from measurements of the thermally-induced current fluctuations that occur in all electrical conductors. This paper reviews the status of Johnson noise thermometry and its prospects for both metrological measurements and for practical applications in industry. The review begins with a brief description of the foundations and principles of Johnson noise thermometry before outlining the many different techniques and technological breakthroughs that have enabled the application of Johnson noise thermometry to high-accuracy, cryogenic, and industrial thermometry. Finally, the future of noise thermometry is considered. As the only purely electronic approach to thermodynamic temperature measurement, Johnson noise thermometry has appeal for metrological applications at temperatures ranging from below 1 mK up to 800 K. With the rapid advances in digital technologies, there are also expectations that noise thermometry will become a practical option for some industrial applications, perhaps reaching temperatures above 2000 K.

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Section: Plasma and Hot Gas Thermometrymentioning

confidence: 99%

Johnson noise thermometry

Benz

Rogalla

et al. 2019

Meas. Sci. Technol.

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“…Thermal noise behaves differently depending on the ignition conditions. Korobchen and Ivashchen later investigated how well the measured electron temperature correlates with the gas temperature [25]. Baum et al [26] evaluated Johnson noise for hot gas temperature measurement by constructing a gas sensor using a hot air chamber filled with cesium chloride.…”

Section: Application In Hot Gas Plasmamentioning

confidence: 99%

The role of thermal noise on key parameters governing the improvement of tokamak fusion reactor efficiency using aneutronic D−H3e fuel

Shakeri¹,

Heidari²,

Hosseinimotlagh³

et al. 2023

Phys. Scr.

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In this study the time evolution of energy and particles densities in burning plasma for D3He fuel in fusion reactors in the presence of thermal noise are investigated. The fusion reaction takes places in plasma of deuterium and helium3 heated to millions of degrees. It is expected that at this temperature, the thermal noise could have a significant effect on plasma behavior and not considered in the solution of equations so far, so this effect is intended for the first time in this work. In order to attain a proper set of particle and energy balance equations, an appropriate thermal noise term is considered in the set of four coupled differential equations. Such form of thermal noise is standard in researches of Langevin dynamic equations, and also consistent with fluctuation-dissipation-theorem. These equations are solved simultaneously by numerical methods. The results of the calculations for fusion power, particles densities, fusion energy density and quality factor in two states of without noise and with noise show that in the conditions where the thermal noise is considered, the above parameters and the quality factor are increased and actually the system performance is improved.

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“…One is to measure the time required for an ultrasonic pulse to travel a given distance [19][20][21] and the other is to measure the resonant frequency (RF) of an acoustic resonator. The SOS is derived from its relationship with the RF and the cavity length of the resonator [22][23][24]. The above SOS-measuring methods are implemented exclusively using the speaker-microphone combination.…”

Section: Introductionmentioning

confidence: 99%

A speakerless acoustic thermometer

Xiong¹,

Yan²,

Cai³

et al. 2023

Meas. Sci. Technol.

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Existing acoustic thermometers are often implemented using speaker-microphone systems, which are power-consuming and inconvenient to operate. Here we demonstrate a simple speakerless acoustic thermometer, which is an acoustic Fabry-Perot resonator (AFPR) consisting of a tubular acoustic waveguide and a microphone whose diaphragm acts as a reflective surface of the AFPR. Theoretical analysis shows that the resonant frequency (fm) at a given mode order (m) for the AFPR is a linear function of m with the slope (Δf/Δm) depending on the ambient temperature. Therefore, when the linear relationship between fm and m for the AFPR is measured, the ambient temperature can be determined from its slope. The values of fm at different m can be easily obtained by using the AFPR to detect ambient white noise rather than the sound signal from a loudspeaker. The thermometric performance of the prepared AFPR was investigated in a range of temperatures from -17 °C to 60 °C. The measured temperatures show the mean absolute error below 0.9 °C relative to those simultaneously obtained with a commercial electronic thermometer. As experimentally demonstrated in this work, the AFPR can detect extremely weak white noise in the anechoic room and thus enables to accurate measure the ambient temperature there, attributable to its ultrahigh pressure sensitivity at each resonant frequency. The advantages of simple structure, low power consumption, convenient operation, and high detection accuracy offer the AFPR outstanding applicability for on-site temperature measurements in various environments.

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Selectivity in measuring the thermodynamic temperature of an ionized gas with a noise thermometer based on a capacity transducer

Cited by 4 publications

References 0 publications

Johnson noise thermometry

Johnson noise thermometry

The role of thermal noise on key parameters governing the improvement of tokamak fusion reactor efficiency using aneutronic D−H3e fuel

A speakerless acoustic thermometer

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