Method for designing electromagnetic shielding body of liquid capacitance-type sensor

A technology of capacitive sensor and design method, which is applied in the basic field of application, can solve problems such as difficult measurement work, complex electromagnetic environment of electronic equipment, and no longer accurate measured parameters.

Inactive Publication Date: 2009-01-21
BEIHANG UNIV
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  • Abstract
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Problems solved by technology

[0003] However, with the rapid development of science and technology, the electromagnetic environment in which electronic equipment works is becoming more and more complex.
Due to its structural characteristics, liquid capacitive sensors are more s

Method used

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  • Method for designing electromagnetic shielding body of liquid capacitance-type sensor
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  • Method for designing electromagnetic shielding body of liquid capacitance-type sensor

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0028] The invention relates to a design method of an anti-electromagnetic interference shielding body of a liquid capacitive sensor, based on the relevant theory of cut-off waveguide, including mathematical modeling and numerical calculation, and rationally designing the shielding body according to calculation results. The concrete steps of this method are:

[0029] (1) Determine the spectral characteristics of the interference source: determine the spectral characteristics of the interference source that needs to be shielded, and use the actual test method to determine the characteristics of the airborne interference source. There are many test methods, and antennas and receivers of different receiving frequency bands can be used to determine Measure the frequency and amplitude of the actual interference source;

[0030] (2) Determine the se...

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Abstract

The invention relates to a design process of a shield for resisting electro-magnetic interference in a liquid capacitance type sensor, which comprises firstly determining the frequency spectrum of an interference source needing to be shielded, secondly determining the sensitivity characteristic of the sensor, conducting the sensitivity test for a device which is actually interfered to obtain the sensitivity characteristic curve line, thirdly calculating the round hole size of the shield according to the relative theories of cut-off waveguide, the actual shielding requirements and the working environment request of the sensor, fourthly building a simulation model in a computer, and conducting value emulation calculation, comparing the shielding results, and finally instructing to process real objects according to the calculated results. The invention solves the problem of the electro-magnetic interference of the sensor, and facilitates the sensor to work normally under the electro-magnetic radiation, and the shield which is designed has light weight and excellent oil permeability, and can not affect the normal working.

Description

technical field [0001] The invention relates to a design method for a shielding body of a liquid capacitive sensor, which belongs to the field of basic application. Background technique [0002] A liquid capacitive sensor is a sensor that measures parameters such as the volume of a liquid. The capacitance value of the capacitive sensor is very small and must be converted into a corresponding voltage, current or frequency signal by the measurement circuit. There are many types of conversion circuits, and bridge circuits, resonant circuits, frequency modulation circuits, and operational amplifier circuits are more commonly used at present. [0003] However, with the rapid development of science and technology, the electromagnetic environment in which electronic equipment works is becoming more and more complex. Due to its structural characteristics, liquid capacitive sensors are more sensitive to external electromagnetic radiation, that is, when there is external electromagn...

Claims

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Application Information

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IPC IPC(8): G01D5/24
Inventor 赵小莹王义陈文青苏东林张秀强
Owner BEIHANG UNIV
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