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

Abstract

The invention discloses a device and method for measuring the shielding effectiveness of a shielding cover of a communication cable joint, which includes an analog signal generating unit, which simulates and generates the frequency and waveform of the transmission signal in the cable core wire, and generates sine wave and square wave signals; the shielding to be tested The cover unit is configured to be set in the shielding cover of the cable joint to be tested; the signal amplification and transmitting unit is configured to be set in the shielding cover to amplify and transmit the signal generated by the analog signal generating unit to the surrounding space, simulating the cable The electromagnetic signal radiated outward during operation; the electromagnetic signal detection unit is configured to measure the electric field and magnetic field in three axial directions in space, and can separately measure the electromagnetic field strength at a fixed frequency point, by applying radiation to the analog cable The electromagnetic signal measures the electric field and magnetic field in all directions at different positions of the cable, and realizes the measurement of the shielding effectiveness of the shielding cover of the cable joint.

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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