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
CN101424545AActive Publication Date: 2009-05-06BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
BEIHANG UNIV
Publication Date
2009-05-06

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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.
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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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