Effective Application of Microwave Resonant Cavity System to Flow Chemistry

The microwave resonant cavity is the sensor of wetness measurement in medium perturbation method. Local eddy current and viscous dissipation of stream will cause the temperature difference of cavity, which led to the shift of resonant frequency affecting the stability of sensor. This paper calculates the temperature distribution of cavity under conditions that varieties of steam parameters and velocity of flow by flow-solid coupling method. The thermal deformation of different conditions of cavity is calculated. The influence of thermal deformation to the resonance frequency of resonant cavity is analyzed, according to the average value of node deformation of the cavity effective surface. The results show that the average temperature of cavity and thermal deformation increase with the steam parameter increase and the offset value of resonance frequency increases. The wetness measurement scheme of wet steam on the turbine exhaust needs to improve to reduce the effect of cavity body deformation.

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Small-Conductive-Particle Detection with a Microwave Resonant Cavity

IEEJ Transactions on Industry Applications ◽

10.1541/ieejias.132.788 ◽

2012 ◽

Vol 132 (8) ◽

pp. 788-793 ◽

Cited By ~ 6

Author(s):

Makoto Ikeda ◽

Atsushi Mase ◽

Kiichiro Uchino

Keyword(s):

Resonant Cavity ◽

Conductive Particle ◽

Particle Detection ◽

Microwave Resonant Cavity

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Investigation of free-floating nitrogen and helium plasmas generatedin a microwave resonant cavity

10.2514/6.1989-2380 ◽

1989 ◽

Cited By ~ 4

Author(s):

PHILIP BALAAM ◽

MICHAEL MICCI

Keyword(s):

Resonant Cavity ◽

Microwave Resonant Cavity

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The Uncertainty Analysis of Microwave Resonant Cavity System for Wetness Measurement

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.643.176 ◽

2014 ◽

Vol 643 ◽

pp. 176-182

Author(s):

Jun Ke Zhang ◽

Tin Ge ◽

Jing Yu Liu ◽

Ming Li ◽

Xiao Zhe Yan

Keyword(s):

Sampling Error ◽

Resonant Cavity ◽

Water Film ◽

Steam Pressure ◽

Frequency Measurement ◽

Standard Uncertainty ◽

Microwave Cavity ◽

System Uncertainty ◽

Cavity System ◽

Parameters Measurement

Steam pressure and resonant frequency of microwave cavity are important measure parameters of microwave wetness measurement system. The measuring precision of pressure and frequency directly affect the accuracy of wetness measurement. This paper takes different pressure and wetness of steam as example to analyze the parameter uncertainty of measurement relationship and deduces standard uncertainty of wetness measurement. The system comprehensive uncertainty is identified, when the parameters measurement, cavity heat expansion, sampling error, sedimentary water film and so on are considered. The result shows that the system uncertainty is less than 0.004%. The system uncertainty introduced by pressure measurement is small and can be neglected, but the system uncertainty from frequency measurement has a great effect. The precisely measurement of resonance frequency is key to ensure the accuracy of the system.

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Temperature distribution in a flowing fluid heated in a microwave resonant cavity

10.2172/229477 ◽

1996 ◽

Author(s):

J.R. Jr. Thomas ◽

E.M. Nelson ◽

R.J. Kares ◽

R.M. Stringfield

Keyword(s):

Temperature Distribution ◽

Resonant Cavity ◽

Flowing Fluid ◽

Microwave Resonant Cavity

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Contactless Mass Determination of Arbitrarily Shaped Objects by Microwave Resonator Measurements

MRS Proceedings ◽

10.1557/proc-347-289 ◽

1994 ◽

Vol 347 ◽

Author(s):

Andrzej W. Kraszewski ◽

Stuart O. Nelson

Keyword(s):

Uncertainty Analysis ◽

Resonant Cavity ◽

Microwave Resonator ◽

Mass Determination ◽

Microwave Resonant Cavity ◽

Dielectric Objects ◽

Better Than

ABSTRACTThe basis is presented for using a microwave resonant cavity as an effective “contactless balance”, providing information about the mass of dielectric objects inserted into the cavity. An uncertainty analysis presented in the paper confirms that the mass of small dielectric objects can be determined by this technique with an accuracy better than 4%.

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