Device and method of measuring shielding effectiveness of communication cable joint shielding cover

Abstract

The invention discloses a device and a method of measuring the shielding effectiveness of a communication cable joint shielding cover. The device comprises an analog signal generating unit, a to-be-measured shielding cover unit, a signal amplifying and transmitting unit and an electromagnetic signal detecting unit, wherein the analog signal generating unit simulates and generates the frequency andthe waveform of signals transmitted in a cable core, and sinusoidal and square wave signals are generated; the to-be-measured shielding cover unit is configured to be the to-be-measured cable joint shielding cover; the signal amplifying and transmitting unit is configured to be arranged in the shielding cover, the signals generated by the analog signal generating unit are amplified and transmitted to the surrounding space, and electromagnetic signals radiated outwards during cable operation are simulated; and the electromagnetic signal detecting unit is configured to measure three axial electric and magnetic fields in space separately, the intensity of the electromagnetic field at a fixed frequency point can be measured independently, and through applying radiated electromagnetic signalsto an analog cable and measuring electric and magnetic fields in different directions at different positions of the cable, the shielding effectiveness of the cable joint shielding cover can be measured.

Description

technical field [0001] The invention relates to a device and method for measuring the shielding effectiveness of a shielding cover of a communication cable joint. Background technique [0002] Communication cables are widely used in various fields of the national economy, and are known as the "vessels" and "nerves" of the national economy, and are also necessary basic products in people's daily life. During the operation of the communication cable, the external radiation of the high-frequency signal transmitted in the cable will cause electromagnetic interference to the external environment on the one hand, and more importantly, the leaked electromagnetic signal will also cause information leakage, which has a great impact on the security of information transmission. Especially in the cable joint part, at present, most of the communication cable joints are connected to the shielding layer of the cable by the joint shielding cover, and the joint part is also the most serious ...

AI Technical Summary

Problems solved by technology

During the operation of the communication cable, the external radiation of the high-frequency signal transmitted in the cable will cause electromagnetic interference to the external environment on the one hand, and more importantly, the leaked electromagnetic signal will also cause information leakage, which has a great impact on the security of information transmission. Especially in the cable joint part, at present, most of the communication cable joints are connected to the shielding layer of the cable by the joint shielding cover, and the joint part is also the most serious part of electromagnetic leakage; on the other hand, there are many types of cable joint shielding covers. In engineering applications, it is also necessary to compare and select various cable joint shielding covers, so it is necessary to propose a measuring device and method that can effectively measure the shielding effectiveness of the cable joint shielding cover, and correctly measure and evaluate the shielding effect of the shielding cover

[0003] The patent with the publication number CN106249104A mainly aims at online monitoring of the real-time status of the cable shielding layer. It can monitor whether the cable shielding layer is damaged or corroded, but it cannot accurately measure the shielding effectiveness value of the cable shielding layer, let alone analyze different frequencies. Detailed analysis and comparison of the shielding effectiveness of the cable shielding layer or different types of cable joint shielding covers; therefore, this patent is proposed, which can measure the shielding performance of different cable joint shielding covers at different frequencies, and can separately measure the electric field The analysis of the shielding cover of the cable joint and the magnetic field can comprehensively understand the shielding effect of the shielding cover of the cable joint on a specific electromagnetic signal, so as to facilitate the improvement of the material of the shielding cover of the cable joint and the related information security assessment

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