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Electromagnetic shielding device of liquid capacitance type sensor

A capacitive sensor, electromagnetic shielding technology, applied in the direction of converting sensor output, using electromagnetic/magnetic devices to transmit sensing components, measuring devices, etc. The effect of engineering application scope, expanding application scope, reducing weight and volume

Active Publication Date: 2009-05-06
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the liquid capacitive sensor is sensitive to external electromagnetic radiation and is susceptible to interference radiation, the present invention proposes an electromagnetic shielding device for the liquid capacitive sensor

Method used

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  • Electromagnetic shielding device of liquid capacitance type sensor

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Embodiment Construction

[0024] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0025] The invention provides an electromagnetic shielding device for a liquid capacitive sensor, Figure 3a It is a schematic diagram of the three-dimensional structure of the shielding body. The shielding body 1 is a metal hollow body with a certain thickness. The metal hollow body can be made of synthetic materials and copper-plated on its surface. The liquid capacitive sensor is placed in the cavity 101 of the shielding body 1 . The upper surface of the shielding body 1 is an openable cover 103 , and a wire hole 104 is provided on the cover 103 . Sealing is achieved by adding conductive rubber between the opening cover 103 and the shielding body 1 , and between the wire hole 104 and the sensor wire.

[0026] There are several circular holes A2 on the side walls 102 around the shielding body 1, such as Figure 3b , Figure 4 A cylinder A3 is formed ext...

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Abstract

The invention discloses an electromagnetic shield device of a liquid capacitive type sensor. The electromagnetic shield device is a metal hollow cavity body with certain thickness, and the liquid capacitor type sensor is arranged inside the hollow cavity of the shield. The shield is provided with a plurality of circular holes A on the side wall, the outer side on the side wall of the shield extends along the axial direction of the circular holes A to form a cylinder A, and the extending end port of the cylinder A is a sealed port. The side wall of the cylinder A is provided with a circular hole B, the outer side on the side wall of the cylinder A extends along the axial direction of the circular hole B to form a cylinder B perpendicular to the cylinder A axially, and the end port of the cylinder B is an opening. The device greatly increases the shielding effect by using the length of dielectric waveguide and the standing wave property of electromagnetic wave. The device can resist the outside electromagnetic interference for the liquid capacitive type sensor, and ensures that the liquid capacitive type sensor work normally under the electromagnetic radiation. Meanwhile, the shield does not affect the normal operation of the liquid sensor.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding, and in particular relates to an electromagnetic shielding body device for a liquid capacitive sensor. 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 measuring circuit. There are many types of measurement 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01D5/24G01D5/243
Inventor 戴飞王义廖意苏东林侯燕春王龙峰
Owner BEIHANG UNIV
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