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Method for measuring inner wall water film thickness of microwave humidity sensor on basis of linear fitting

A technology of humidity sensor and water film thickness, which is applied in the direction of using microwaves to measure moisture content, measuring devices, instruments, etc., can solve the problems of high cost and complicated equipment of the optical fiber method, and achieve the effect of convenient use, elimination of measurement errors, and accurate measurement.

Inactive Publication Date: 2016-09-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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AI Technical Summary

Problems solved by technology

These methods are not suitable for the measurement of the thickness of the water film on the inner surface of the microwave resonator, and the fiber optic method has high cost and complicated equipment

Method used

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  • Method for measuring inner wall water film thickness of microwave humidity sensor on basis of linear fitting
  • Method for measuring inner wall water film thickness of microwave humidity sensor on basis of linear fitting
  • Method for measuring inner wall water film thickness of microwave humidity sensor on basis of linear fitting

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Embodiment 1

[0033] like figure 1 As shown, a method for measuring the thickness of water film on the inner wall of a microwave humidity sensor based on linear fitting includes the following steps:

[0034] Step 1: Calculate the microwave measurement cavity 6 at TE when there is no water film 111 The resonant frequency f in the mode 02 :

[0035] f 02 = c 2 π ϵ r m - ( 1.841 a ) 2 + ( π l ) 2 - ...

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Abstract

The invention discloses a method for measuring the inner wall water film thickness of a microwave humidity sensor on the basis of linear fitting. The measuring method comprises the following steps that the resonant frequency of a microwave measurement resonant cavity in a TE111 mode on the condition that no water film exists is calculated; the water film thickness and the corresponding frequency deviation caused by the water film thickness are calculated, wherein 0<hi<=200 micrometers, and 0<i<=N; linear fitting is conducted on the water film thickness hi and the corresponding frequency deviation deltaf<w-1,i> caused by the water film thickness; the resonant frequency of the microwave measurement resonant cavity in the TE111 mode is measured; the resonant frequency deviation caused by the water film is calculated; the water film thickness is calculated through a linear relation between the water film thickness and the frequency deviation caused by the water film thickness. According to the method, the water film thickness hi and the corresponding frequency deviation deltaf<w-1,i> caused by the water film thickness present the linear relation on the basis of the work of the cylindrical waveguide resonant cavity in the TE111 mode, the inner wall water film thickness of a wet steam humidity sensor is quickly and accurately measured, and convenient conditions are provided for eliminating measuring errors brought by the water film thickness on a humidity measuring result and improving the humidity measuring precision.

Description

technical field [0001] The invention relates to a method for measuring the thickness of water film on the inner wall of a microwave humidity sensor, in particular to a method for measuring the thickness of water film on the inner wall of a microwave humidity sensor based on linear fitting, and belongs 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 steam in the steam ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N22/04G01B15/02
CPCG01B15/02G01N22/04
Inventor 张淑娥杨再旺宋文妙
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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