scholarly journals Acoustic and microwave tests in a cylindrical cavity for acoustic gas thermometry at high temperature

2016 ◽  
Vol 374 (2064) ◽  
pp. 20150049 ◽  
Author(s):  
K. Zhang ◽  
X. J. Feng ◽  
K. Gillis ◽  
M. Moldover ◽  
J. T. Zhang ◽  
...  
Keyword(s):  
High Temperatures ◽  
Cylindrical Cavity ◽  
Thermodynamic Temperature ◽  
Transverse Magnetic ◽  
Microwave Resonance ◽  
Acoustic Transducers ◽  
Resonance Frequencies ◽  
Acoustic Waveguides ◽  
Acoustic Gas Thermometry ◽  
Gas Thermometry

Relative primary acoustic gas thermometry (AGT) determines the ratios of thermodynamic temperatures from measured ratios of acoustic and microwave resonance frequencies in a gas-filled metal cavity on isotherms of interest. When measured in a cavity with known dimensions, the frequencies of acoustic resonances in a gas determine the speed of sound, which is a known function of the thermodynamic temperature T . Changes in the dimensions of the cavity are measured using the frequencies of the cavity's microwave resonances. We explored techniques and materials for AGT at high temperatures using a cylindrical cavity with remote acoustic transducers. We used gas-filled ducts as acoustic waveguides to transmit sound between the cavity at high temperatures and the acoustic transducers at room temperature. We measured non-degenerate acoustic modes in a cylindrical cavity in the range 295 K< T <797 K. The fractional uncertainty of the measured acoustic frequencies increased from 2×10 −6 at 295 K to 5×10 −6 at 797 K. In addition, we measured the frequencies of several transverse magnetic (TM) microwave resonances up to 1000 K in order to track changes in the cavity's length L and radius R . The fractional standard deviation of the values of L deduced from three TM modes increased from 3×10 −6 for T <600 K to 57 × 10 −6 at 1000 K. We observed similar inconsistencies in a previous study.

Relative acoustic gas thermometry setup for low temperature range from 4,2 to 80 K

2020 ◽  
pp. 45-52
Author(s):  
V.G. Kytin ◽  
M.Yu. Ghavalyan ◽  
B.G. Potapov ◽  
E.G. Aslanyan ◽  
A.N. Shchipunov
Keyword(s):  
Low Temperature ◽  
Liquid Helium ◽  
Main Part ◽  
Thermodynamic Temperature ◽  
Temperature Stabilization ◽  
Temperature Range ◽  
Acoustic Gas Thermometry ◽  
Time Required ◽  
Diameter Reduction ◽  
Gas Thermometry

Relative acoustic gas thermometry setup is described. Described setup was developed and tested in VNIIFTRI. The setup is designed for the measurement of thermodynamic temperature in low temperature range down to 4,2 K. Main part of the setup is resonator with reduced cavity diameter. Reduction of resonator dimension lead to several times reduction of cooled parts of the setup with respect to the setup previously developed in VNIIFTRI. This decreases liquid nitrogen and liquid helium consumption required for cooling of resonator. Moreover, reduction of the mass of cooling parts reduces time required for temperature stabilization and thus measurement time. In the work the tests’ results of operation of main parts of the setup are presented.

Acoustic gas thermometry

Metrologia ◽  
2014 ◽  
Vol 51 (1) ◽  
pp. R1-R19 ◽  
Author(s):  
M R Moldover ◽  
R M Gavioso ◽  
J B Mehl ◽  
L Pitre ◽  
M de Podesta ◽  
...  
Keyword(s):  
Acoustic Gas Thermometry ◽  
Gas Thermometry

Installation of Relative Acoustic Gas Thermometry in the Low Temperature Range from 4.2 to 80 K

2020 ◽  
Vol 63 (1) ◽  
pp. 45-52
Author(s):  
V. G. Kytin ◽  
M. Yu. Gavalyan ◽  
B. G. Potapov ◽  
E. G. Aslanyan ◽  
A. N. Shchipunov
Keyword(s):  
Low Temperature ◽  
Temperature Range ◽  
Acoustic Gas Thermometry ◽  
Gas Thermometry

scholarly journals Determination of the Boltzmann constant with cylindrical acoustic gas thermometry: new and previous results combined

Metrologia ◽  
2017 ◽  
Vol 54 (5) ◽  
pp. 748-762 ◽  
Author(s):  
X J Feng ◽  
J T Zhang ◽  
H Lin ◽  
K A Gillis ◽  
J B Mehl ◽  
...  
Keyword(s):  
Boltzmann Constant ◽  
Acoustic Gas Thermometry ◽  
Gas Thermometry

Progress Report on NMIJ Acoustic Gas Thermometry at the Triple Point of Water

2017 ◽  
Vol 39 (1) ◽  
Author(s):  
Tetsuro Misawa ◽  
Januarius Widiatmo ◽  
Yuya Kano ◽  
Takao Sasagawa ◽  
Kazuaki Yamazawa
Keyword(s):  
Triple Point ◽  
Progress Report ◽  
Triple Point Of Water ◽  
Acoustic Gas Thermometry ◽  
Gas Thermometry

scholarly journals An Overview of High Frequency Acoustic Sensors—QCMs, SAWs and FBARs—Chemical and Biochemical Applications

Sensors ◽  
2019 ◽  
Vol 19 (20) ◽  
pp. 4395 ◽  
Author(s):  
Adnan Mujahid ◽  
Adeel Afzal ◽  
Franz L. Dickert
Keyword(s):  
High Frequency ◽  
Piezoelectric Materials ◽  
Fundamental Property ◽  
High Sensitivity ◽  
Enzyme Linked Immunosorbent Assay ◽  
Label Free ◽  
Detection Mechanism ◽  
Acoustic Transducers ◽  
Resonance Frequencies ◽  
Label Free Detection

Acoustic devices have found wide applications in chemical and biosensing fields owing to their high sensitivity, ruggedness, miniaturized design and integration ability with on-field electronic systems. One of the potential advantages of using these devices are their label-free detection mechanism since mass is the fundamental property of any target analyte which is monitored by these devices. Herein, we provide a concise overview of high frequency acoustic transducers such as quartz crystal microbalance (QCM), surface acoustic wave (SAW) and film bulk acoustic resonators (FBARs) to compare their working principles, resonance frequencies, selection of piezoelectric materials for their fabrication, temperature-frequency dependency and operation in the liquid phase. The selected sensor applications of these high frequency acoustic transducers are discussed primarily focusing on the two main sensing domains, i.e., biosensing for working in liquids and gas/vapor phase sensing. Furthermore, the sensor performance of high frequency acoustic transducers in selected cases is compared with well-established analytical tools such as liquid chromatography mass spectrometry (LC-MS), gas chromatographic (GC) analysis and enzyme-linked immunosorbent assay (ELISA) methods. Finally, a general comparison of these acoustic devices is conducted to discuss their strengths, limitations, and commercial adaptability thus, to select the most suitable transducer for a particular chemical/biochemical sensing domain.

scholarly journals Determination of the Boltzmann constant using a quasi-spherical acoustic resonator

2011 ◽  
Vol 369 (1953) ◽  
pp. 4014-4027 ◽  
Author(s):  
Laurent Pitre ◽  
Fernando Sparasci ◽  
Daniel Truong ◽  
Arnaud Guillou ◽  
Lara Risegari ◽  
...  
Keyword(s):  
Molar Mass ◽  
Thermodynamic Temperature ◽  
Standard Uncertainty ◽  
Acoustic Resonator ◽  
Diamond Turning ◽  
Boltzmann Constant ◽  
Triple Point Of Water ◽  
Resonance Frequencies ◽  
Relative Standard

The paper reports a new experiment to determine the value of the Boltzmann constant, , with a relative standard uncertainty of 1.2 parts in 10 6 . k B was deduced from measurements of the velocity of sound in argon, inside a closed quasi-spherical cavity at a temperature of the triple point of water. The shape of the cavity was achieved using an extremely accurate diamond turning process. The traceability of temperature measurements was ensured at the highest level of accuracy. The volume of the resonator was calculated from measurements of the resonance frequencies of microwave modes. The molar mass of the gas was determined by chemical and isotopic composition measurements with a mass spectrometer. Within combined uncertainties, our new value of k B is consistent with the 2006 Committee on Data for Science and Technology (CODATA) value: ( k new B / k B_CODATA −1)=−1.96×10 −6 , where the relative uncertainties are and u r ( k B_CODATA )=1.7×10 −6 . The new relative uncertainty approaches the target value of 1×10 −6 set by the Consultative Committee on Thermometry as a precondition for redefining the unit of the thermodynamic temperature, the kelvin.

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