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Micro-strip chip resonator for measuring humidity of steam turbine

A technology of microstrip patch and resonator, which is applied in the field of microwave measurement, can solve the problems of resonance frequency drift, cavity volume expansion and shrinkage, and large volume of metal cylindrical resonator humidity sensor, etc., and achieve high quality factor and high response sensitivity. Effect

Pending Publication Date: 2017-02-22
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the metal cylinder resonant cavity humidity sensor has the problems of large volume, expansion and shrinkage of cavity volume with temperature change, and serious drift of resonance frequency.

Method used

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  • Micro-strip chip resonator for measuring humidity of steam turbine
  • Micro-strip chip resonator for measuring humidity of steam turbine
  • Micro-strip chip resonator for measuring humidity of steam turbine

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Embodiment Construction

[0061] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0062] Such as figure 1 As shown, a microstrip patch resonator for measuring the humidity of a steam turbine includes a patch 1, a substrate layer and a ground plate 2; the substrate layer is composed of a substrate layer and a sample layer, the patch is printed on the top of the sample layer, and the bottom of the sample layer In contact with the ground plane, whose top is in contact with the substrate layer; the sample layer is a cavity.

[0063] Wet steam can be considered to be composed of dry saturated water vapor and very small saturated water droplets. The size of this mixture is very small. Most of the water droplets have a diameter of less than 2um, and the largest size is only about 200um, which is far smaller than the wavelength of microwaves. Therefore , the equivalent dielectric constant of the wet-steam mixture is only ...

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Abstract

The invention discloses a micro-strip chip resonator for measuring humidity of a steam turbine, comprising a chip, a matrix layer and a grounding plate; the matrix layer is composed of matrix layer and a sample layer; the chip is printed at the top part of the sample layer, and the bottom part of the sample layer is contacted with the grounding plate, the top part thereof is contacted with the matrix layer; the sample layer is a hollow cavity. Compared with ordinary micro-strip linear structure, the micro-strip chip resonator has higher quality factor, and the humidity change reflects the change of the dielectric constant of the whole matrix layer; the reaction sensitivity of the change of wet steam humidity is higher; the resonator is good for exactly measuring the steam humidity, and is more applicable to the online measurement of the steam humidity of the steam turbine.

Description

technical field [0001] The invention relates to a microstrip patch resonator, in particular to a microstrip patch resonator for measuring the humidity of a steam turbine, belonging to the technical field of microwave measurement. Background technique [0002] At present, the methods used to measure the humidity of the flowing wet steam in the steam turbine at home and abroad are mainly thermodynamic method, optical method, CCD imaging technology and microwave perturbation method. The microwave perturbation method is based on the perturbation of the microwave resonant cavity, that is, the resonant frequency of the microwave resonant cavity shifts with the change of the dielectric constant of the dielectric in the cavity. Related, therefore, online measurement of steam humidity can be realized by measuring the frequency offset generated when wet steam passes through the microstrip resonator. Zhang Shu'e et al. proposed a metal cylindrical resonant cavity humidity sensor and b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/22
CPCG01N27/221G01N27/223G01N2027/222
Inventor 孙景芳张淑娥赵颖涛王雅宁
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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