A system and method for detecting electromagnetic shielding effectiveness of a rubber material

Abstract

This invention provides a system and method for testing the electromagnetic shielding effectiveness of rubber materials, comprising: a display control module connected to an intermediate shielding module for sending test commands to the intermediate shielding module; an intermediate shielding module connected to an interference module via a rubber shielding cable for receiving test commands and sending execution commands to the interference module; and an interference module for transmitting a test signal to the intermediate shielding module via the rubber shielding cable after receiving the execution command. The intermediate shielding module transmits the test signal after passing through the rubber shielding cable to the display control module, which compares the received test signal with the original test signal or directly displays the test signal to determine whether the electromagnetic shielding effectiveness of the rubber shielding cable is qualified. The system is reliable, stable, flexible, targeted, and provides reliable test results, fully meeting the application needs of shielding bodies in different fields.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic shielding effectiveness testing technology for rubber materials, and more specifically, to a system and method for testing the electromagnetic shielding effectiveness of rubber materials. Background Technology

[0002] The effectiveness of a shield is measured by its shielding performance. Studies have shown that electromagnetic shielding effectiveness is primarily affected by the sealing of openings in the shield. Since shields inevitably contain various gaps, openings, and defects such as cables entering and exiting, these defects will drastically degrade the shielding effectiveness. The factors that truly determine the actual shielding effectiveness are various electrical discontinuities, including gaps, openings, and cable penetrations. Gaps in shields are very common, especially since modern cabinets and enclosures are assembled, resulting in numerous gaps. If not properly addressed, these gaps will drastically degrade the shielding effectiveness.

[0003] In some typical cabinets, the openings and gaps are mainly divided into four categories: chassis (cabinet) seams, ventilation holes, observation and display holes, and connector and chassis seams. Among them, the interconnection between shielding bodies mainly uses rubber-shielded cables as connecting devices to realize the communication connection between each shielding body. On the one hand, the cables made of rubber materials have excellent electromagnetic shielding effect. On the other hand, by designing a reasonable interconnection structure for the shielding bodies, combined with the characteristics of rubber materials, the openings and gaps can be effectively suppressed.

[0004] Therefore, it can be seen that the communication connection between each shield is the key to the overall electromagnetic shielding effect. However, how to effectively test the electromagnetic shielding effectiveness of the interconnection structure of the shields, i.e. the rubber shielded cables between the shields, still needs further research. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems in the prior art, namely that existing electromagnetic shielding effectiveness testing devices are not suitable for testing the electromagnetic shielding effectiveness of rubber-shielded cables between shielding bodies, and that there is a lack of a method for testing the electromagnetic shielding effectiveness of rubber-shielded cables between shielding bodies.

[0006] Therefore, the first aspect of the present invention provides a system for testing the electromagnetic shielding effectiveness of rubber materials.

[0007] The second aspect of this invention provides a method for testing the electromagnetic shielding effectiveness of rubber materials.

[0008] This invention provides a system for testing the electromagnetic shielding effectiveness of rubber materials, comprising:

[0009] The display control module is connected to the intermediate shielding module and is used to send test commands to the intermediate shielding module;

[0010] An intermediate shielding module is connected to the interference module via a rubber shielded cable and is used to receive test commands and send execution commands to the interference module.

[0011] The interference module is used to send test signals to the intermediate shielding module through a rubber-shielded cable after receiving the execution command;

[0012] The intermediate shielding module transmits the test signal after passing through the rubber shielded cable to the display control module. The display control module compares the received test signal with the original test signal or directly displays the test signal to determine whether the electromagnetic shielding effectiveness of the rubber shielded cable is qualified.

[0013] According to the above-described technical solution of the present invention, a rubber material electromagnetic shielding effectiveness testing system may further have the following additional technical features:

[0014] In the above technical solution, the intermediate shielding module includes a shielding cabinet and a first multi-channel channel unit, a first modulation signal unit, a first broadband channel unit, a first single-board control unit, a first connector, a second connector and a first power supply unit disposed in the shielding cabinet;

[0015] The first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit are respectively connected between the first connector and the second connector; the first connector is connected to the display control module, and the second connector is connected to the interference module through a rubber shielded cable;

[0016] The first power supply unit is used to supply power to the first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit.

[0017] In the above technical solution, the interference module includes an interference cabinet and a second multi-channel channel unit, a second modulation signal unit, a second broadband channel unit, a second single-board control unit, a third connector, and a second power supply unit disposed in the interference cabinet;

[0018] The second multi-channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit are respectively connected to the third connector; the third connector is connected to the second connector via a rubber shielded cable.

[0019] The second power supply unit is used to supply power to the second multi-channel channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit.

[0020] In any of the above technical solutions, the test command sent by the display control module to the intermediate shielding module is any one of network test, fiber optic test, bus test, radio frequency test, switch quantity test, and analog quantity test.

[0021] This invention also provides a method for testing the electromagnetic shielding effectiveness of rubber materials, applied to the testing system described in any of the above technical solutions, the method comprising the following steps:

[0022] S1. Through human-computer interaction, the display control module sends a test command to the intermediate shielding module;

[0023] S2. The intermediate shielding module receives and parses the command, and then sends the execution command to the interference module;

[0024] S3. The interference module receives and executes the command, parses it, and then sends the predetermined test signal to the intermediate shielding module.

[0025] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0026] S5. The display control module receives and stores the test signal; compares the test signal with the pre-stored original test signal file. If the difference rate is below the preset threshold, the electromagnetic shielding performance of the rubber shielded cable is determined to be qualified; otherwise, it is unqualified. Alternatively, the test signal is directly displayed as the output result to determine whether the electromagnetic shielding performance of the rubber shielded cable is qualified.

[0027] S6, repeat steps (1) to (5).

[0028] In the above technical solution, when the test command in S1 is a network test, the method includes the following steps:

[0029] S1. Through human-computer interaction, the display control module sends a network test command to the first multi-channel unit of the intermediate shielding module;

[0030] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0031] S3, the second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP3 audio file as a test signal to the intermediate shielding module;

[0032] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0033] S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP3 audio file. The packet loss rate is determined by the file size. If the average packet loss rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

[0034] In the above technical solution, when the test command in S1 is fiber optic test, the method includes the following steps:

[0035] S1. Through human-computer interaction, the display control module sends a fiber optic test command to the first multi-channel unit of the intermediate shielding module.

[0036] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0037] S3. The second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP4 format video file as a test signal to the intermediate shielding module.

[0038] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0039] S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP4 format video file. The packet loss rate is determined by the file size. If the average packet loss rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

[0040] In the above technical solution, when the test command in S1 is a bus test or an RF test, the method includes the following steps:

[0041] S1. Through human-computer interaction, the display control module sends a command to the first multi-channel channel unit of the intermediate shielding module to perform bus test or radio frequency test.

[0042] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0043] S3. The second multi-channel channel unit of the interference module receives and executes the command, and then controls the second modulation signal unit to send the predetermined message format as a test signal to the intermediate shielding module.

[0044] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0045] S5. The display control module receives and stores the test signal, compares it with the pre-stored original message, and determines the bit error rate. If the bit error rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

[0046] In the above technical solution, when the test command in S1 is a switch quantity test, the method includes the following steps:

[0047] S1. Through human-computer interaction, the display control module sends a switch quantity test command to the first multi-channel channel unit of the intermediate shielding module;

[0048] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0049] S3. The interference module receives and executes the command and then tests it by connecting 28V / GND and GND / open circuit signals respectively.

[0050] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0051] S5. The display control module receives and stores test signals, and displays the test signals directly as output results.

[0052] In the above technical solution, when the test command in S1 is an analog quantity test, the method includes the following steps:

[0053] S1. Through human-computer interaction, the display control module sends an analog quantity test command to the first multi-channel channel unit of the intermediate shielding module;

[0054] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0055] S3. The interference module receives and executes commands and parses them, then collects 1V, 2V, 3V, 4V, and 5V voltages for testing.

[0056] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0057] S5, the display control module receives and stores test signals, and displays the test signals directly as output results, showing the voltage curve in real time.

[0058] In summary, due to the adoption of the above-mentioned technical features, the beneficial effects of the present invention are:

[0059] By designing an electromagnetic shielding effectiveness testing system, which employs an interconnected structure of a display control cabinet, an intermediate shielding cabinet, and an interference cabinet, and combines various signal transmission testing methods, this system can not only test the electromagnetic shielding effectiveness of different rubber materials, but also effectively test the electromagnetic shielding effectiveness of rubber materials under different signal transmission modes (including network testing, fiber optic testing, bus testing, radio frequency testing, switch quantity testing, and analog quantity testing). This provides a solid foundation for the selection of rubber materials and the fabrication of related connecting devices, thereby improving the effectiveness of the shielding body.

[0060] Through the effective combination of hardware and software, the system is not only reliable and stable, but also flexible, targeted, and reliable in testing, fully meeting the application needs of shielding bodies in different fields.

[0061] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0062] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0063] Figure 1 This is a block diagram of a rubber material electromagnetic shielding effectiveness testing system according to an embodiment of the present invention. Detailed Implementation

[0064] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0065] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0066] The following reference Figure 1 This invention describes a system and method for testing the electromagnetic shielding effectiveness of rubber materials, provided by some embodiments of the present invention.

[0067] like Figure 1 As shown, the first embodiment of the present invention proposes a rubber material electromagnetic shielding effectiveness testing system, including: a display control module for realizing human-computer interaction, an intermediate shielding module connected to the display control module, and an interference module connected to the intermediate shielding module through a rubber shielding cable.

[0068] The display control module is connected to the intermediate shielding module and is used to send test commands to the intermediate shielding module;

[0069] An intermediate shielding module is connected to the interference module via a rubber shielded cable and is used to receive test commands and send execution commands to the interference module.

[0070] The interference module is used to send test signals to the intermediate shielding module through a rubber-shielded cable after receiving the execution command;

[0071] The intermediate shielding module transmits the test signal after passing through the rubber shielded cable to the display control module. The display control module compares the received test signal with the original test signal or directly displays the test signal to determine whether the electromagnetic shielding effectiveness of the rubber shielded cable is qualified.

[0072] Specifically, the intermediate shielding module includes a shielding cabinet and a first multi-channel channel unit, a first modulation signal unit, a first broadband channel unit, a first single-board control unit, a first connector, a second connector, and a first power supply unit disposed within the shielding cabinet;

[0073] The first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit are respectively connected between the first connector and the second connector; the first connector is connected to the display control module, and the second connector is connected to the interference module through a rubber shielded cable;

[0074] Signal connections between the first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit;

[0075] The first power supply unit is used to supply power to the first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit.

[0076] The interference module includes an interference cabinet and a second multi-channel channel unit, a second modulation signal unit, a second broadband channel unit, a second single-board control unit, a third connector, and a second power supply unit, all installed within the interference cabinet.

[0077] The second multi-channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit are respectively connected to the third connector; the third connector is connected to the second connector via a rubber shielded cable.

[0078] Signal connections exist between the second multi-channel channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit;

[0079] The second power supply unit is used to supply power to the second multi-channel channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit.

[0080] In this embodiment, both the shielding cabinet of the intermediate shielding module and the interference cabinet of the interference module can be made of high-conductivity rust-resistant aluminum materials such as 5A06 and 6063, which are lightweight and have good mechanical properties. After conductive oxidation, they can acquire good conductivity. Furthermore, based on conventional structural component shielding, the design achieves electromagnetic compatibility adaptability by optimizing screw gaps, using sealed shielding materials, and improving electrical connection design.

[0081] The following section will elaborate on each unit.

[0082] First power supply unit and second power supply unit: provide power to each unit inside the module.

[0083] In this embodiment, the power supply unit can be powered by a general airborne platform DC28V and AC115V power supply system. The power supply unit performs filtering, voltage regulation, and voltage transformation to the working voltage of each functional unit.

[0084] The first multi-channel channel unit and the second multi-channel channel unit are signal control units.

[0085] The encoding software that runs the radio frequency signal receives control commands from the display control module, generates corresponding signals, and transmits them to the intermediate shielding module or interference module. The interference module and the intermediate shielding module analyze the signals and transmit the analysis results.

[0086] The first modulation signal unit and the second modulation signal unit are used for encoding and decoding to convert and transmit radio frequency signals.

[0087] In this embodiment, the first and second modulation signal units employ direct-sequence spread spectrum technology, offering advantages such as concentrated power density and strong anti-interference capabilities. Each unit features a software-based Forward Error Correction (FEC) algorithm, boasting high coding efficiency and strong error correction capabilities. In the event of sudden interference, it can actively correct interfered data packets, significantly improving reliability and transmission distance; without FEC, such data packets would be discarded. The radio also features data encryption. The data transmitted in the air is random; a robust encryption and decryption algorithm renders data interception meaningless. It supports packet length settings and accommodates different real-time characteristics and data packets.

[0088] The main features are as follows:

[0089] 1) Adopts the latest LoRa technology;

[0090] 2) It adopts military-grade LoRa modulation technology, which features data encryption and adjustable packet length;

[0091] 3) Large single packet, compatible with Modbus protocol;

[0092] 4) Simple and efficient power supply design, supports power adapters or wired connection, supports 8-28V power supply;

[0093] 5) The maximum transmission power can reach 3W and supports multi-level adjustment;

[0094] 6) Supports LBT (Local Noise Level Transmission) function; the radio automatically waits to transmit based on the current ambient noise level. This greatly improves the module's communication success rate in harsh environments.

[0095] 7) Supports wireless transmission of command data packets, remote configuration or reading of wireless module parameters;

[0096] 8) Supports communication key functionality to effectively prevent data interception;

[0097] 9) It can realize multi-level relay networking, effectively extend the communication distance, and realize ultra-long-distance communication;

[0098] 10) A temperature compensation circuit is used, and the frequency stability is better than ±1.2PPM;

[0099] 11) Operating temperature range: -40℃~+85℃, adaptable to various harsh working environments;

[0100] 12) The all-aluminum alloy shell is compact, easy to install, and has good heat dissipation; the perfect shielding design provides good electromagnetic compatibility and strong anti-interference ability.

[0101] 13) Multiple protection functions, such as reverse power connection protection, over-connection protection, and antenna surge protection, greatly increase reliability;

[0102] 14) Powerful software functions, all parameters can be set through programming: such as power, frequency, speed, address ID, etc.;

[0103] 15) Ultra-low power consumption, with a standby current of only 10mA (even lower power consumption in power saving mode and sleep mode);

[0104] The first broadband channel unit and the second broadband channel unit are used to receive, transmit, and analyze optical and electrical signals.

[0105] The technical specifications of the broadband channel unit in this embodiment are as follows:

[0106] 1) Single-mode single-fiber bidirectional, transmit wavelength 1310nm, transmission distance range 0-25km, output optical power -15~-8dBm, receive sensitivity ≤-36dBm, SFP or DSC;

[0107] 2) Number of ports: 4 100M adaptive Ethernet ports + 1 100M optical interface, backplane bandwidth ≥ 1Gbps; Ethernet ports can be straight-through or cross-connected adaptively.

[0108] 3) Ethernet ports support port isolation and full-duplex flow control functions, and data and traffic on each port must be isolated;

[0109] 4) Device power consumption <10W;

[0110] 5) Adopts military-grade chips and fanless heat dissipation design;

[0111] 6) Supports wide operating temperature range: -40℃ to 75℃, and storage temperature range: -40℃ to 75℃. Moisture-proof and corrosion-resistant, with a relative humidity range of 5% to 95% RH and no condensation.

[0112] 8) Supports interface protection (port protection);

[0113] 9) The device supports the standard SNMP network management protocol, providing a unified network management platform for monitoring the operating status and alarms of remote devices;

[0114] 10) Supports multiple VLANs on a single port;

[0115] 11) Supports dual redundant power supply, with wide voltage input for DC or AC power;

[0116] 12) Supports giant frame transmission, with a forwarding frame length of 9000 bytes;

[0117] 13) The average jitter latency at the device port is 1µs;

[0118] 15) Industrial indicators comply with GJB150-2009 Environmental Testing Standards for Electrical and Electronic Products;

[0119] 16) The indicators comply with the national standard for electromagnetic compatibility, GJB151B-2013.

[0120] First single-board control unit:

[0121] It is used to generate an analog voltage of 1V to 5V, collect the analog voltage value, and report it to the first multi-channel channel unit after passing through the first single-board control unit. The first multi-channel channel unit encapsulates the data and reports it to the display control module.

[0122] This is used to detect 28V / GND and GND / open circuit signals, and reports the collected results to the first multi-channel channel unit. The first multi-channel signal unit encapsulates the signals and reports them to the display control module. The display control module compares the switch signals generated by the second single-board control unit with the switch detection results reported by the first single-board control unit. If they match, the function is considered normal; if they do not match, a fault occurs in the data acquisition.

[0123] The second single-board control unit has the following functions: receiving control commands from the second multi-channel channel unit, generating 28V / GND and GND / open circuit signals, which are collected by the first single-board control unit through the signal line between the interference module and the intermediate shielding module, and then reported to the display control module through the first multi-channel channel unit of the intermediate shielding module.

[0124] The second embodiment of the present invention proposes a method for testing the electromagnetic shielding effectiveness of rubber materials, and based on the first embodiment, as follows: Figure 1As shown, the method includes the following steps:

[0125] S1. Through human-computer interaction, the display control module sends a test command to the intermediate shielding module;

[0126] S2. The intermediate shielding module receives and parses the command, and then sends the execution command to the interference module;

[0127] S3. The interference module receives and executes the command, parses it, and then sends the predetermined test signal to the intermediate shielding module.

[0128] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0129] S5. The display control module receives and stores the test signal; compares the test signal with the pre-stored original test signal file. If the difference rate is below the preset threshold, the electromagnetic shielding performance of the rubber shielded cable is determined to be qualified; otherwise, it is unqualified. Alternatively, the test signal is directly displayed as the output result to determine whether the electromagnetic shielding performance of the rubber shielded cable is qualified.

[0130] S6, repeat steps (1) to (5).

[0131] The test command sent by the display control module to the intermediate shielding module in step S1 is any one of the following: network test, fiber optic test, bus test, radio frequency test, switch quantity test, and analog quantity test.

[0132] The detection method of this embodiment is described below for different test commands.

[0133] 1. Network testing, the specific testing process is as follows:

[0134] S1. Through human-computer interaction, the display control module sends a network test command to the first multi-channel unit of the intermediate shielding module to perform Ethernet communication function test.

[0135] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0136] S3, the second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP3 audio file as a test signal to the intermediate shielding module;

[0137] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0138] S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP3 audio file. The packet loss rate is determined by the file size. If the average packet loss rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified. At the same time, the display control module can play the two audio files for intuitive comparison.

[0139] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0140] 2. Fiber optic testing, the specific testing procedure is as follows:

[0141] S1. Through human-computer interaction, the display control module sends a fiber optic test command to the first multi-channel unit of the intermediate shielding module to perform fiber optic communication function test.

[0142] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0143] S3. The second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP4 format video file as a test signal to the intermediate shielding module.

[0144] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0145] S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP4 format video file. The packet loss rate is determined by the file size. If the average packet loss rate of the file is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified. At the same time, the display control module can play the two video files for intuitive comparison.

[0146] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0147] 3. Bus testing, the specific testing procedure is as follows:

[0148] S1. Through human-computer interaction, the display control module sends a bus test command to the first multi-channel channel unit of the intermediate shielding module to perform bus communication function test.

[0149] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0150] S3. The second multi-channel channel unit of the interference module receives and executes the command, and then controls the second modulation signal unit to send the predetermined message format (e.g., FF FE 01 02 03…FD FD) as a test signal to the intermediate shielding module.

[0151] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0152] S5. The display control module receives and stores the test signal, compares it with the pre-stored original message, and determines the bit error rate. If the bit error rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified. At the same time, the display control module can display the message content.

[0153] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0154] 4. Radio frequency testing, the specific testing procedure is as follows:

[0155] S1. Through human-computer interaction, the display control module sends a radio frequency test command to the first multi-channel unit of the intermediate shielding module to perform radio frequency communication function test.

[0156] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0157] S3. The second multi-channel channel unit of the interference module receives and executes the command, and then controls the second modulation signal unit to send the predetermined message format (e.g., FF FE 01 02 03…FD FD) as a test signal to the intermediate shielding module.

[0158] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0159] S5. The display control module receives and stores the test signal, compares it with the pre-stored original message, and determines the bit error rate. If the bit error rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified. At the same time, the display control module can display the message content.

[0160] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0161] 5. Switch quantity test, the specific test procedure is as follows:

[0162] S1. Through human-computer interaction, the display control module sends a switch quantity test command to the first multi-channel channel unit of the intermediate shielding module to perform switch quantity function test.

[0163] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0164] S3. The interference module receives and executes commands and parses them, then connects 28V / GND and GND / open circuit signals respectively for testing; after the test, the interference cabinet sends the test results to the intermediate shielding cabinet.

[0165] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0166] S5. The display control module receives and stores test signals, and displays the test signals directly as output results;

[0167] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0168] 6. Analog quantity testing, the specific testing procedure is as follows:

[0169] S1. Through human-computer interaction, the display control module sends an analog quantity test command to the first multi-channel channel unit of the intermediate shielding module;

[0170] S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module;

[0171] S3. The interference module receives and executes commands and parses them, then collects 1V, 2V, 3V, 4V, and 5V voltages for testing; after testing, the interference cabinet sends the test results to the intermediate shielding cabinet.

[0172] S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module.

[0173] S5, the display control module receives and stores test signals, and displays the test signals directly as output results, showing the voltage curve in real time.

[0174] S6. Repeat steps S1 to S5 to test the same rubber-shielded cable under different parameters, or different rubber-shielded cables under the same parameters, or different rubber-shielded cables under different parameters, where parameters include the connection method of the rubber-shielded cable, etc.

[0175] In the above test mode, the first multi-channel unit of the display control module and the intermediate shielding module communicates via TCP / IP protocol. The display control module acts as the client and the intermediate shielding cabinet acts as the server. The server IP is 192.168.1.60 and the port number is 5000.

[0176] The minimum time interval for issuing commands is 200ms, and the minimum time interval for transmitting update files / firmware packets is 20ms.

[0177] The message format is shown in the table below:

[0178]

[0179]

[0180] (1) Starting code

[0181] The length is 2 bytes, the type is unsigned short, and the fixed value is 0x55AA.

[0182] (2) Data packet type

[0183] It has a length of 1 byte and a type of unsigned char.

[0184] (3) Data packet length

[0185] It has a length of 2 bytes, is of type unsigned short, and its value is the length of the field "[data packet]".

[0186] (4) Data packets

[0187] The length and content of the data packets are not fixed and are determined by the application layer. The number (0xxx) preceding the data packet name indicates the data packet type.

[0188] 1) 0x00 Request to send a file, communication channel: Ethernet cable / fiber optic cable, as shown in the table below:

[0189] Parameter name byte count Data types Remark File name length 1 unsigned char Longest 256 file name 256 char* For example: xxx.mp3 / xxx.mp4

[0190] 2) 0x01 Preparing to send a file, communication channel: Ethernet cable / fiber optic cable, as shown in the table below:

[0191] Parameter name byte count Data types Remark File name length 1 unsigned char Longest 256 file name 256 char* For example: xxx.mp3 / xxx.mp4 File size 4 unsigned int

[0192] 3) 0x02 File packet transmission, communication channel: network cable / fiber optic cable, as shown in the table below:

[0193]

[0194] 4) 0x03 Request radio frequency data, data packet length is 0.

[0195] 5) 0x04 Radio Frequency Data, Communication Channel: Radio Frequency, as shown in the table below:

[0196]

[0197] This data packet is sent once every time a data packet 【0x03 Request RF Module Data】 is received.

[0198] 6) 0x05 Requests serial bus data, data packet length is 0.

[0199] 7) 0x06 Serial bus data, communication channel: bus, as shown in the table below:

[0200]

[0201] Send this data packet once every time you receive a data packet named "0x05 Request Serial Bus Data".

[0202] 8) 0x07 Switch status, communication channel: twisted pair, as shown in the table below:

[0203] Parameter name byte count Data types Remark 28V / GND state 1 unsigned char 1: 28V, 0: GND GND / Open circuit state 1 unsigned char 1: GND, 0: Open path

[0204] The intermediate shielding module periodically sends this data packet to the interference module, with a period of 1 second.

[0205] (5) Verification code

[0206] It has a length of 2 bytes and is of type unsigned short. The checksum's verification range refers to the data portion from the start code (including the start code byte) to the data packet (including the data packet byte).

[0207] The checksum method uses a single-byte checksum, which is the lower 16 bits after accumulating all bits except the frame trailer and checksum. See below for reference:

[0208] unsigned int CheckSum(uint8_t*Buf,unsigned int Len)

[0209] {

[0210] unsigned int i = 0;

[0211] unsigned long sum = 0;

[0212] unsigned int checksum = 0;

[0213] for(i=0; i <Len;i++)

[0214] {

[0215] sum += *Buf++;

[0216] }

[0217] checksum = sum & 0x0000ffff;

[0218] Return checksum;

[0219] }

[0220] (6) Termination Code

[0221] The length is 2 bytes, the type is unsigned short, and the fixed value is 0x66BB.

[0222] The method proposed in this embodiment provides an effective means for verifying the key indicators of the system. Testing has shown that this embodiment can achieve the expected electromagnetic shielding effectiveness verification purpose, while also taking into account reliability, maintainability, and safety. It is suitable for widespread application.

[0223] In this specification, the illustrative expressions of the terms used do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0224] Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention shall be included within the scope of protection of this invention.

Claims

1. A testing system for the electromagnetic shielding effectiveness of rubber materials, characterized in that, include: The display control module is connected to the intermediate shielding module and is used to send test commands to the intermediate shielding module; An intermediate shielding module is connected to the interference module via a rubber shielded cable and is used to receive test commands and send execution commands to the interference module. The interference module is used to send test signals to the intermediate shielding module through a rubber-shielded cable after receiving the execution command; The intermediate shielding module transmits the test signal after passing through the rubber shielded cable to the display control module. The display control module compares the received test signal with the original test signal or directly displays the test signal to determine whether the electromagnetic shielding effectiveness of the rubber shielded cable is qualified. The intermediate shielding module includes a shielding cabinet and a first multi-channel channel unit, a first modulation signal unit, a first broadband channel unit, a first single-board control unit, a first connector, a second connector, and a first power supply unit disposed within the shielding cabinet. The first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit are respectively connected between the first connector and the second connector; the first connector is connected to the display control module, and the second connector is connected to the interference module through a rubber shielded cable; The first power supply unit is used to supply power to the first multi-channel channel unit, the first modulation signal unit, the first broadband channel unit, and the first single-board control unit; The interference module includes an interference cabinet and a second multi-channel channel unit, a second modulation signal unit, a second broadband channel unit, a second single-board control unit, a third connector, and a second power supply unit, all housed within the interference cabinet. The second multi-channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit are respectively connected to the third connector; the third connector is connected to the second connector via a rubber shielded cable. The second power supply unit is used to supply power to the second multi-channel channel unit, the second modulation signal unit, the second broadband channel unit, and the second single-board control unit.

2. The electromagnetic shielding effectiveness testing system for rubber materials according to claim 1, characterized in that, The test command sent by the display control module to the intermediate shielding module is any one of the following: network test, fiber optic test, bus test, radio frequency test, switch quantity test, and analog quantity test.

3. A method for testing the electromagnetic shielding effectiveness of rubber materials, characterized in that, Applied to the detection system as described in claim 1 or 2, the method includes the following steps: S1. Through human-computer interaction, the display control module sends a test command to the intermediate shielding module; S2. The intermediate shielding module receives and parses the command, and then sends the execution command to the interference module; S3. The interference module receives and executes the command, parses it, and then sends the predetermined test signal to the intermediate shielding module. S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5. The display control module receives and stores the test signal; compares the test signal with the pre-stored original test signal file. If the difference rate is below the preset threshold, the electromagnetic shielding performance of the rubber shielded cable is determined to be qualified; otherwise, it is unqualified. Alternatively, the test signal is directly displayed as the output result to determine whether the electromagnetic shielding performance of the rubber shielded cable is qualified. S6, repeat steps (1) to (5).

4. The method for testing the electromagnetic shielding effectiveness of rubber materials according to claim 3, characterized in that, When the test command in S1 is a network test, the method includes the following steps: S1. Through human-computer interaction, the display control module sends a network test command to the first multi-channel unit of the intermediate shielding module; S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module; S3, the second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP3 audio file as a test signal to the intermediate shielding module; S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP3 audio file. The packet loss rate is determined by the file size. If the average packet loss rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

5. The method for testing the electromagnetic shielding effectiveness of rubber materials according to claim 3, characterized in that, When the test command in S1 is fiber optic test, the method includes the following steps: S1. Through human-computer interaction, the display control module sends a fiber optic test command to the first multi-channel unit of the intermediate shielding module. S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module; S3. The second multi-channel channel unit of the interference module receives and executes the command, and then sends the predetermined MP4 format video file as a test signal to the intermediate shielding module. S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5. The display control module receives and stores the test signal and compares it with the pre-stored original MP4 format video file. The packet loss rate is determined by the file size. If the average packet loss rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

6. The method for testing the electromagnetic shielding effectiveness of rubber materials according to claim 3, characterized in that, When the test command is a bus test or an RF test, the method includes the following steps: S1. Through human-computer interaction, the display control module sends a command to the first multi-channel channel unit of the intermediate shielding module to perform bus test or radio frequency test. S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module; S3. The second multi-channel channel unit of the interference module receives and executes the command, and then controls the second modulation signal unit to send the predetermined message format as a test signal to the intermediate shielding module. S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5. The display control module receives and stores the test signal, compares it with the pre-stored original message, and determines the bit error rate. If the bit error rate is below 2%, the electromagnetic shielding effectiveness of the rubber shielded cable is qualified; otherwise, it is unqualified.

7. The method for testing the electromagnetic shielding effectiveness of rubber materials according to claim 3, characterized in that, When the test command is a switch quantity test, the method includes the following steps: S1. Through human-computer interaction, the display control module sends a switch quantity test command to the first multi-channel channel unit of the intermediate shielding module; S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module; S3. The interference module receives and executes the command and then tests it by connecting 28V / GND and GND / open circuit signals respectively. S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5. The display control module receives and stores test signals, and displays the test signals directly as output results.

8. The method for testing the electromagnetic shielding effectiveness of rubber materials according to claim 3, characterized in that, When the test command is an analog quantity test, the method includes the following steps: S1. Through human-computer interaction, the display control module sends an analog quantity test command to the first multi-channel channel unit of the intermediate shielding module; S2. The first multi-channel channel unit of the intermediate shielding module receives the command and performs protocol parsing, and then sends the execution command to the interference module; S3. The interference module receives and executes commands and parses them, then collects 1V, 2V, 3V, 4V, and 5V voltages for testing. S4. The intermediate shielding module receives and stores the test signal, and then reports it to the display control module. S5, the display control module receives and stores test signals, and displays the test signals directly as output results, showing the voltage curve in real time.

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