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Measuring system and measuring method for thickness of water film on inner wall of humidity sensor by adopting microwave perturbation method

A technology of humidity sensor and microwave perturbation method, which is applied to the system for measuring the thickness of water film on the inner wall of the vapor humidity sensor. The microwave perturbation method is used to measure the thickness of water film on the inner wall of the humidity sensor, which can solve the problems of complex equipment and high cost of the optical fiber method.

Inactive Publication Date: 2016-06-29
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are not suitable for measuring the thickness of the water film on the inner surface of the resonator, and the fiber optic method is expensive and the equipment is complicated

Method used

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  • Measuring system and measuring method for thickness of water film on inner wall of humidity sensor by adopting microwave perturbation method
  • Measuring system and measuring method for thickness of water film on inner wall of humidity sensor by adopting microwave perturbation method
  • Measuring system and measuring method for thickness of water film on inner wall of humidity sensor by adopting microwave perturbation method

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Embodiment 1

[0038] Such as figure 1 As shown, it is composed of signal processing and controller 1, frequency sweep signal source 2, isolator 3, power divider 4, circulator 5, microwave measurement resonant cavity 6, resonant frequency scanning module, pressure gauge 9 and thermometer 10; Described resonant frequency scanning module is made up of multiplier 7 and low-pass filter 8;

[0039] The output terminals of the pressure gauge 9 and the thermometer 10 are connected to signal processing and the corresponding input terminals of the controller 1, the signal processing and the control output terminals of the controller 1 are connected to the input terminals of the frequency sweep signal source 2, and the frequency sweep signal The source 2 generates a frequency sweep signal under the control of the signal processing and controller 1, and the sweep signal is input to the power divider 4 through the isolator 3, and the signal output by the power divider 4 passes through the circulator 5 a...

Embodiment 2

[0047] Such as image 3 Shown, a kind of measuring method for the system described in embodiment 1 is characterized in that: comprise the following steps:

[0048] Step 1: Measure the microwave measurement cavity 6 at the TE 111 The resonant frequency f in the mode 1 ;

[0049] Step 2: Calculate the microwave measurement cavity 6 at TE when there is no water film 111 Resonant frequency in mode:

[0050] f 02 = c 2 π ϵ r m - ( 1.841 a ) 2 + ( π ...

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Abstract

The invention discloses a measuring system and a measuring method for thickness of a water film on an inner wall of a humidity sensor by adopting a microwave perturbation method. The measuring system comprises a signal processing controller, a sweep frequency signal source, an isolator, a power divider, a circulator, a microwave measurement resonant cavity, a resonant frequency scanning module, a pressure gage and a thermometer. The measuring method comprises the following steps: measuring resonant frequency of the microwave measurement resonant cavity under TE111 mode; calculating the resonant frequency of the microwave measurement resonant cavity under TE111 mode without the water film; calculating resonant frequency shift caused by the water film; solving the thickness of the water film on the inner wall of the humidity sensor under TE111 mode. The measuring system provided by the invention works on the basis of the TE111 mode of the cylindrical waveguide resonant cavity, is used for quickly and accurately measuring the thickness of the water film on the inner wall of the humidity sensor and brings convenience in eliminating the measuring error of the humidity measuring result caused by the thickness of the water film and increasing the humidity measuring precision.

Description

technical field [0001] The invention relates to a system and method for measuring the thickness of water film on the inner wall of a steam humidity sensor, in particular to a system and method for measuring the thickness of water film on the inner wall of a humidity sensor by a microwave perturbation method, belonging to the technical field of on-line monitoring of steam turbine humidity. Background technique [0002] For the wet steam state of the last stages of the steam turbine, the surface of the blades will be corroded if the humidity is too high, and the degree of water erosion caused by different humidity is also different. Therefore, from the perspective of the operating efficiency of the steam turbine and the degree of water erosion of the blades, the online accurate measurement of the humidity of the wet steam is of great significance to the long-term stability and life of the steam turbine. At present, the methods used to measure the humidity of the flowing wet st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/02
CPCG01B15/02
Inventor 张淑娥杨再旺宋文妙
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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