Radiation emission testing device and method for extraction pipe network

Abstract

The invention relates to a radiation emission testing device and method for an extraction pipe network, and belongs to the technical field of electromagnetic compatibility testing. The problems that in the prior art, extraction pipe network equipment lacks a standardized special test system, and the test result repeatability and accuracy are low are solved. The technical scheme comprises an anechoic chamber, an antenna system and a control receiving system. A non-metal supporting table is arranged in the anechoic chamber to place tested equipment, the antenna system receives electromagnetic wave signals, and the control and receiving system regulates and controls antenna postures and processes the signals to obtain test results. According to the invention, the high-precision and high-consistency test of the radiation emission of the extraction pipe network equipment is realized, and the standardization of the test process and the reliability of the result are obviously improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic compatibility testing, in particular to a radiation emission testing device for extraction pipe network equipment and a corresponding testing method. BACKGROUND

[0002] Electromagnetic compatibility (EMC) refers to the ability of a device or system to function properly in its electromagnetic environment and not to cause unacceptable electromagnetic disturbance to anything in that environment. Radiation emission is an important assessment item of electromagnetic compatibility, mainly referring to the phenomenon that energy is emitted by a source in the form of electromagnetic waves and propagates in space. This phenomenon may cause serious interference to other electronic devices in the surrounding environment. Therefore, strict radiation emission testing of electronic products is the key to ensuring the stability of the overall system electromagnetic environment and the safe and reliable operation of the equipment.

[0003] Extraction pipe network systems are widely used in coal mines, tunnels and other environments for monitoring and regulating gas concentration, and contain a large number of sensors, controllers, actuators and other electronic devices in the system. These devices will generate electromagnetic radiation when working, and if the radiation intensity exceeds a certain limit, it may not only interfere with the normal operation of other devices within the pipe network system, but also affect the accuracy of other precision instruments in the surrounding environment, and even cause safety hazards.

[0004] Currently, for radiation emission testing of different types of electronic products, the corresponding product standards need to be selected, and the measurement limits or test requirements suitable for the tested equipment are determined according to different equipment levels or classifications. Products are generally divided into six categories: lighting electrical equipment, information technology equipment, medical equipment, etc. However, for devices such as extraction pipe network in specific industrial application scenarios, although general standards can be referred to, there is a lack of a systematic and standardized special testing device and methodology. The existing testing process may have problems such as non-standard device layout and non-uniform test environment configuration, resulting in low repeatability and accuracy of test results, which makes radiation emission testing one of the most difficult projects to pass in the product development and certification process.

[0005] Therefore, how to provide a radiation emission testing device and method for extraction pipe network equipment with complete structure and clear process is an urgent technical problem to be solved in the field. SUMMARY

[0006] The main purpose of the present application is to overcome the deficiencies in the prior art, and to provide a radiation emission testing device and method for extraction pipe network, aiming to realize standardized, high-precision and highly reproducible testing of the radiation emission performance of extraction pipe network equipment.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A radiation emission testing device for pumping pipe network, comprising: An anechoic chamber, inside which a non-metallic support table for placing an equipment under test (EUT) is arranged; An antenna system arranged in the anechoic chamber and used for receiving electromagnetic wave signals emitted by the EUT; A control and receiving system arranged outside the anechoic chamber and electrically connected with the antenna system, used for controlling the posture of the antenna system and receiving and processing the electromagnetic wave signals from the antenna system to obtain radiation emission test results.

[0008] Further, the control and receiving system comprises: An electromagnetic interference (EMI) receiver for receiving and measuring the electromagnetic wave signals; A system interface and controller connected with the EMI receiver and used for controlling the movement and signal switching of the antenna system; A host computer connected with the system interface and controller and used for running test software and processing data.

[0009] Further, the antenna system comprises at least two antennas arranged on an antenna tower to cover different test frequency ranges; The at least two antennas comprise a loop antenna for a 9kHz-30MHz frequency range, a wideband antenna for a 30MHz-3GHz frequency range, and a horn antenna for a frequency range above 1GHz.

[0010] Further, a preamplifier is further arranged between the antenna and the control and receiving system, and used for amplifying the electromagnetic wave signals received by the antenna.

[0011] Further, the measurement distance between the EUT and the antenna system is 10 meters; the height of the antenna system is variable in the range of 1m to 4m; and the height of the non-metallic support table is 0.8m.

[0012] Further, the control and receiving system is signal-connected with the antenna system arranged in the anechoic chamber through a waveguide.

[0013] A radiation emission testing method for pumping pipe network, comprising the following steps: S1: Place the equipment under test (EUT) on a non-metallic support table in the anechoic chamber, and arrange it according to the preset standard; S2: Turn on the power supply of the EUT and make it run in a preset working mode; S3: Control the antenna system in the anechoic chamber to scan in the vertical polarization and horizontal polarization directions, and change the height of the antenna system to search for the maximum radiation emission value; S4: Measure the scanned signal by the electromagnetic interference (EMI) receiver connected to the antenna system to obtain the measurement value; S5: Compare the measurement value with the preset product standard limit value to determine whether the test in the current working mode passes.

[0014] Further, after S5, further comprising: S6: Switch the EUT to another working mode and repeat S3 to S5 until all working modes of the EUT are tested; if any working mode fails, the EUT is determined to be unqualified.

[0015] Further, the measurement value obtained in S4 is a quasi-peak (QP) value.

[0016] Further, in S1, when the EUT is a desktop device, the arrangement method comprises: Place the EUT on the non-metallic support table with a height of 0.8 m, and align the back of the EUT with the rear edge of the non-metallic support table; Bundle the excess cable part of the EUT into a wire harness with a length not longer than 0.4 m, and ensure that the distance between all cables and the horizontal reference ground plate is greater than 0.4 m.

[0017] Further, in S1, when the EUT is a floor-standing device, the arrangement method comprises: Place the EUT on the horizontal reference ground plate, and make the distance between the metal body of the EUT and the horizontal reference ground plate not more than 0.15 m through an insulating pad.

[0018] The present application has the following advantages: The present application provides a complete test device, which integrates an anechoic chamber, an antenna system and a control receiving system, forms a special test platform for the EUT, and ensures the stability of the test environment and the standardization of the test configuration.

[0019] The test method provided by the application has clear process, complete steps and rigorous logic from device layout, mode selection, signal scanning to result determination, which greatly improves the standardization and operability of the test work.

[0020] Through scanning of the antenna height and polarization direction and covering test of multiple working modes, the radiation emission characteristics of the tested device in various states can be comprehensively and accurately evaluated, the accuracy and comprehensiveness of the test results are ensured, and the missed test and misjudgment are effectively avoided.

[0021] Other advantages, objects and features of the application will be set forth in part in the following specification, and in part will become apparent to those skilled in the art upon examination of the following specification, or can be learned from practice of the application. The objects and other advantages of the application can be realized and attained by the methods and instrumentalities particularly pointed out in the following specification. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to make the objects, technical solutions and advantages of the application clearer, the preferred embodiments of the application will be described in detail below with reference to the drawings, in which: Figure 1 The overall structure schematic diagram of the radiation emission test device provided by the embodiment of the application is shown in the figure. Figure 2 The detailed system connection block diagram of the radiation emission test device provided by the embodiment of the application is shown in the figure. DETAILED DESCRIPTION

[0023] The embodiments of the application are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the application from the disclosure of the specification. The application can also be implemented or applied through other different embodiments, and the details in the specification can be modified or changed based on different views and applications without departing from the spirit of the application. It should be noted that the diagrams provided in the following embodiments only illustrate the basic concept of the application in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0024] The drawings are only used for illustrative explanation, and the representation is only a schematic diagram, not a physical diagram, and cannot be understood as a limitation of the application; in order to better illustrate the embodiments of the application, some components in the drawings are omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it can be understood that some known structures and their descriptions in the drawings can be omitted.

[0025] The same or similar reference numerals in the drawings of the embodiments of the present application correspond to the same or similar components; in the description of the present application, it should be understood that if the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "back", etc. are based on the orientations or positional relationships shown in the drawings, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationships in the drawings are only used for exemplary illustration and cannot be understood as a limitation on the present application, for those skilled in the art, the specific meanings of the above terms can be understood according to the specific circumstances.

[0026] The first aspect of the present application provides a radiation emission testing device for pumping pipe network, comprising: An anechoic chamber, which is internally provided with a non-metallic support table for placing a test device EUT; An antenna system, which is arranged in the anechoic chamber and is used for receiving electromagnetic wave signals emitted by the test device EUT; A control and receiving system, which is arranged outside the anechoic chamber and is electrically connected with the antenna system, is used for controlling the posture of the antenna system, and receiving and processing the electromagnetic wave signals from the antenna system to obtain radiation emission test results.

[0027] The second aspect of the present application provides a radiation emission testing method for pumping pipe network, comprising the following steps: S1: placing a pumping pipe network device as a test device EUT on a non-metallic support table in an anechoic chamber, and arranging according to a preset standard; S2: turning on the power supply of the test device EUT and making it run in a preset working mode; S3: controlling the antenna system in the anechoic chamber to scan in the vertical polarization and horizontal polarization directions, and changing the height of the antenna system to search for the maximum radiation emission value; S4: measuring the scanned signals by an electromagnetic interference EMI receiver connected with the antenna system to obtain measurement values; S5: comparing the measurement values with preset product standard limit values to determine whether the test in the current working mode passes.

[0028] Please refer to Figure 1 and Figure 2 , Figure 1 which shows the physical layout of the testing device, Figure 2 which shows the detailed system composition and signal flow of the device. The device mainly consists of three functional modules: test environment module, signal transceiving module and control processing module.

[0029] The test environment module is mainly an anechoic chamber. An anechoic chamber is a shielded, enclosed space with walls lined with absorbing material to create an open field environment that simulates an electromagnetic free space. Inside the chamber, there is a non-metallic support table for placing the extraction pipe network equipment under test, i.e. the equipment under test (EUT). According to a specific configuration, the height of the non-metallic support table is 0.8 meters, and the size of the tabletop is usually 1.5 meters by 1.0 meters.

[0030] The signal transceiver module mainly includes an antenna system and related preamplifiers arranged in the anechoic chamber. The antenna system is installed on a liftable and rotatable antenna tower. In order to cover a wide test frequency range from 9 kHz to 18 GHz, the antenna system is preferably composed of multiple antennas. Specifically, as shown in Figure 2 , the system includes a Schwarzbeck FMZB1519B loop antenna for the low frequency band of 9 kHz to 30 MHz, a Schwarzbeck VULB9163 TRILOG wideband antenna for the medium frequency band of 30 MHz to 3 GHz, and a Schwarzbeck BBHA9120D horn antenna for higher frequency bands such as 1 GHz to 18 GHz. The weak electromagnetic signals received by the antenna are first amplified by a preamplifier, such as an ERIT-E-EMC001380 preamplifier or an ERIT-E EMC051845SE preamplifier, to improve the signal-to-noise ratio and ensure measurement accuracy.

[0031] The control processing module is mainly arranged in a shielded control room outside the anechoic chamber to avoid interference with the test environment in the chamber by its own operation. The module is specifically embodied as a control and receiving system in Figure 2 . It includes a core measurement device, i.e. an R&S ESR7 electromagnetic interference (EMI) receiver, for accurate quantitative analysis of signals. In addition, it also includes a SI-300-RE system interface, a controller 1 and a controller 2, and an ERIT-E-GEN-RE master computer. The professional test software runs on the master computer, which controls the antenna tower in the chamber to lift and polarize through the controllers, selects different antennas and preamplifiers through the system interface, receives measurement data from the EMI receiver, and processes, displays and stores the data.

[0032] In order to ensure the integrity of the shielded room, the signal cables between the signal transceiver module in the chamber and the control processing module outside the shielded room pass through the wall through a special waveguide, which can effectively prevent external electromagnetic waves from leaking into the chamber or internal test signals from leaking out.

[0033] In terms of physical layout, as shown in Figure 1As shown, the measured distance between the edge of the subject device EUT and the projection of the antenna center on the ground is set to 10 meters, which is a standard 10-meter method test configuration. During the test, the height of the antenna tower will be continuously changed between 1 meter and 4 meters to capture the maximum radiation field strength in space formed by the superposition of direct waves and ground reflected waves.

[0034] Embodiment 2 This embodiment provides a method for performing a radiated emission test on a desktop extraction pipe network device, such as a gas monitoring substation, using the device described in Embodiment 1. The workflow of this method covers the technical solutions of claims 7, 8, 9, and 10.

[0035] First step, device layout. The gas monitoring substation is placed as the subject device EUT on a non-metallic support table in the anechoic chamber. Since it is a desktop device, it needs to be laid out strictly according to the standard. It is placed on a non-metallic table with a height of 0.8 meters and a size of 1.5 meters by 1.0 meters. The back of the device is aligned with the rear edge of the table. The power cord and signal cord connected to the monitoring substation and other cables need to be bundled in an 8-shaped manner with a length of no more than 0.4 meters. At the same time, it is necessary to ensure that the distance of all cables from the horizontal reference ground plate is greater than 0.4 meters.

[0036] Second step, mode setting. Turn on the power switch of the monitoring substation and operate it to enter the normal working mode, such as real-time monitoring and data display mode.

[0037] Third step, perform scan test. Set the frequency range of the test on the host computer, for example, 30 MHz to 1 GHz, and select the corresponding product standard limit value. Start the test software, which will automatically control the antenna system to start scanning. First, perform horizontal polarization test, the controller drives the antenna tower to uniformly rise from 1 meter to 4 meters, while the EMI receiver performs fast peak scanning, recording the maximum value of each frequency point. Then, the software controls the antenna to switch to vertical polarization, and drives the antenna tower to rise from 1 meter to 4 meters again to complete the vertical polarization scan.

[0038] Fourth step, accurate measurement and data reading. The test software filters out several frequency points with the strongest radiation values based on the peak value data obtained in the previous step. Subsequently, the software controls the EMI receiver to perform more accurate quasi-peak value QP value measurement at these frequency points. QP value is a kind of detection method that can better reflect the physiological sensory influence of electromagnetic disturbance on the human eye or human ear, etc.

[0039] Step 5, result determination. The measured QP value is compared with the preset standard limit value. If the QP value of all frequency points is less than the standard limit value, it is determined that the radiation emission test of the monitoring substation in the current working mode is passed. Otherwise, if the QP value of any frequency point is greater than the standard limit value, it is determined as not passed.

[0040] Step 6, multi-mode test. After completing the test of the normal working mode, the monitoring substation is switched to another key working mode, such as the sound-light alarm mode or the data communication mode with the upper computer. The test procedures of steps 3 to 5 are completely repeated. Until all the working modes of the device are tested. The final conclusion is that as long as the test result of one working mode is not passed, the overall radiation emission project of the gas monitoring substation product is determined as unqualified.

[0041] Embodiment 3 This embodiment provides a method for testing the radiation emission of a floor-mounted extraction pipe network device, such as a frequency conversion control cabinet of a large extraction pump, by using the device described in embodiment 1. The working process of the method mainly embodies the technical solution of claim 11.

[0042] The test method of this embodiment is basically the same as that of embodiment 2, and the main difference is in the device arrangement stage of the first step.

[0043] Step 1, device arrangement. Since the frequency conversion control cabinet is a floor-mounted device, it should be directly placed on the horizontal reference grounding plate of the anechoic chamber. In order to achieve electrical insulation, an insulating support with a thickness not exceeding 0.15 meters should be placed between the bottom of the control cabinet and the metal shell and the grounding plate. The power cable and control cable connected to the control cabinet should naturally fall to the horizontal reference grounding plate, but also need to be insulated from the grounding plate. The excess length of the cable also needs to be bundled into a wire harness with a length not greater than 0.4 meters.

[0044] The subsequent mode setting, scanning test, accurate measurement, result determination, and multi-mode test steps are consistent with the processes described in embodiment 2. Through such arrangement and test, the radiation emission performance of the large floor-mounted device in the actual working state can be accurately evaluated.

[0045] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the present application.

Claims

1. A radiation emission testing device for a drainage pipeline network, characterized in that: include: An anechoic chamber, which is equipped with a non-metallic support platform for placing the device under test (EUT); An antenna system is provided in the anechoic chamber and is used to receive electromagnetic wave signals emitted by the device under test (EUT). A control and receiving system is provided, located outside the anechoic chamber and electrically connected to the antenna system, for attitude control of the antenna system and for receiving and processing the electromagnetic wave signals from the antenna system to obtain radiated emission test results.

2. The radiation emission testing device for extraction pipelines according to claim 1, characterized in that: The control and receiving system includes: An electromagnetic interference (EMI) receiver is used to receive and measure the electromagnetic wave signals. The system interface and controller are connected to the electromagnetic interference (EMI) receiver and are used to control the movement and signal switching of the antenna system. The main control computer is connected to the system interface and controller, and is used to run test software and process data.

3. The radiation emission testing device for extraction pipelines according to claim 1 or 2, characterized in that: The antenna system includes at least two types of antennas mounted on an antenna tower to cover different test frequency ranges; The at least two types of antennas include: a loop antenna for a frequency range of 9 kHz to 30 MHz, a broadband antenna for a frequency range of 30 MHz to 3 GHz, and a horn antenna for a frequency range above 1 GHz.

4. The radiation emission testing device for extraction pipelines according to claim 3, characterized in that: A preamplifier is also provided between the antenna and the control and receiving system, the preamplifier being used to amplify the electromagnetic wave signal received by the antenna.

5. The radiation emission testing device for extraction pipelines according to claim 1, characterized in that: The measurement distance between the device under test (EUT) and the antenna system is 10 meters; the height of the antenna system is variable from 1 meter to 4 meters; and the height of the non-metallic support platform is 0.8 meters.

6. The radiation emission testing device for extraction pipelines according to claim 1, characterized in that: The control and receiving system is connected to the antenna system located in the anechoic chamber via a waveguide.

7. A method for testing radiated emission in a drainage pipeline network, characterized in that: Includes the following steps: S1: Place the sampling pipeline equipment, which serves as the EUT (Equipment Under Test), on a non-metallic support platform in the anechoic chamber and lay it out according to the preset standards. S2: Turn on the power to the device under test (EUT) and run it in a preset working mode; S3: Control the antenna system in the anechoic chamber to scan in the vertical and horizontal polarization directions, and change the height of the antenna system to search for the maximum radiated emission value; S4: The scanned signal is measured by an electromagnetic interference (EMI) receiver connected to the antenna system to obtain the measured value; S5: Compare the measured value with the preset product standard limit to determine whether the test in the current working mode has passed.

8. The radiation emission testing method for extraction pipelines according to claim 7, characterized in that: Following S5, it also includes: S6: Switch the device under test (EUT) to another operating mode, and repeat S3 to S5 until all operating modes of the EUT have been tested; if any operating mode fails, the EUT is deemed unqualified.

9. The radiation emission testing method for extraction pipelines according to claim 7 or 8, characterized in that: The measurement value obtained in S4 is the quasi-peak QP value.

10. The radiation emission testing method for extraction pipelines according to claim 7, characterized in that: In step S1, when the device under test (EUT) is a desktop device, its deployment method includes: The device under test (EUT) is placed on the non-metallic support platform with a height of 0.8m, with its back side aligned with the rear edge of the non-metallic support platform. Bundle the extra-long cable portion of the EUT into a bundle with a length not exceeding 0.4m, and ensure that the distance between all cables and the horizontal reference grounding plate is greater than 0.4m.

11. The radiation emission testing method for extraction pipelines according to claim 7, characterized in that: In step S1, when the device under test (EUT) is a floor-standing device, its deployment method includes: The device under test (EUT) is placed on a horizontal reference grounding plate, and an insulating pad is used to ensure that the distance between the metal body and the horizontal reference grounding plate does not exceed 0.15m.

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