CN113740619B - Electromagnetic signal monitoring device - Google Patents
Electromagnetic signal monitoring device Download PDFInfo
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- CN113740619B CN113740619B CN202110931739.4A CN202110931739A CN113740619B CN 113740619 B CN113740619 B CN 113740619B CN 202110931739 A CN202110931739 A CN 202110931739A CN 113740619 B CN113740619 B CN 113740619B
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- 238000012806 monitoring device Methods 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 64
- 238000005070 sampling Methods 0.000 claims abstract description 39
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 239000002184 metal Substances 0.000 claims description 8
- 239000000523 sample Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0871—Complete apparatus or systems; circuits, e.g. receivers or amplifiers
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Abstract
The disclosure provides an electromagnetic signal monitoring device, which comprises the following specific implementation scheme: the explosion-proof shell of the underground monitoring host ensures the safety of working in the underground severe environment, the power supply module provides conversion voltage for the underground monitoring host when working, the antenna and the detector are used for receiving electromagnetic signals in various frequency ranges in the environment, the control module sets triggering conditions and sampling parameters of the frequency domain signal acquisition module and the time domain signal acquisition module under the control of the underground monitoring host on the ground, and stores time domain signals acquired by the time domain signal acquisition module according to the corresponding triggering conditions and the sampling parameters and frequency domain signals acquired by the frequency domain signal acquisition module according to the corresponding triggering conditions and the sampling parameters, so that the simultaneous acquisition of the time domain signals and the frequency domain signals is realized, the explosion-proof shell meets the acquisition requirements of the electromagnetic signals in the underground severe environment, and the interface design enables the underground monitoring host to analyze the acquired time domain signals and the acquired frequency domain signals, so that the requirements of remote transmission and analysis are met.
Description
Technical Field
The disclosure relates to the technical field of electromagnetic signal monitoring, in particular to an electromagnetic signal monitoring device.
Background
The situation under the mine is very complicated, the electric equipment is various in the narrow space under the mine, the conduction electromagnetic interference generated by high-power equipment such as various transformers, switching power supplies, frequency conversion devices, mining equipment, ventilation equipment, transportation equipment and the like is very serious, the underground electromagnetic environment is deteriorated, the equipment such as control monitoring and the like can be interfered, and the equipment running in the environment is affected.
The mastering of the condition of the underground electromagnetic environment has important reference value for various products and equipment design application. The underground test environment is very severe, the test conditions are also very severe, the requirements on the volume, the electrical performance, the working duration and the like of the test instrument are met, and the related test instrument cannot meet all the requirements.
Disclosure of Invention
The present disclosure provides an electromagnetic signal monitoring device.
According to an aspect of the present disclosure, there is provided an electromagnetic signal monitoring apparatus,
comprising the following steps: the underground monitoring system comprises an underground monitoring host and an underground monitoring host, wherein the underground monitoring host comprises an antenna, a detector, an explosion-proof shell, and a frequency domain signal acquisition module, a time domain signal acquisition module, a control module and a power module which are arranged inside the explosion-proof shell.
The antenna is arranged outside the explosion-proof shell and is used for receiving electromagnetic signals in the environment;
the detector is arranged outside the explosion-proof shell and is used for collecting electromagnetic signals in the environment;
the frequency domain signal acquisition module is connected with the antenna and used for converting electromagnetic signals in the environment received by the antenna into frequency domain signals;
the time domain signal acquisition module is connected with the detector and used for converting electromagnetic signals in the environment acquired by the detector into time domain signals;
the on-well monitoring host is used for controlling the control module to set a triggering condition, controlling the control module to set a first sampling parameter of the frequency domain signal acquisition module and a second sampling parameter of the time domain signal acquisition module, and analyzing the acquired time domain signal and the acquired frequency domain signal;
the control module is connected with the frequency domain signal acquisition module and is used for setting the triggering condition and the first sampling parameter of the frequency domain signal acquired by the frequency domain signal acquisition module under the control of the uphole monitoring host, and storing and uploading the frequency domain signal to the uphole monitoring host;
the control module is also connected with the time domain signal acquisition module and is used for setting the triggering condition and the second sampling parameter of the time domain signal acquired by the time domain signal acquisition module, and storing and uploading the time domain signal to the uphole monitoring host;
the power module is connected with the control module, the frequency domain signal acquisition module and the time domain signal acquisition module and is used for converting alternating current voltage of the underground power supply into direct current voltage corresponding to the control module, the frequency domain signal acquisition module and the time domain signal acquisition module.
The technical scheme provided by the embodiment of the disclosure comprises the following beneficial effects:
the explosion-proof shell of the underground monitoring host ensures the safety of working in the underground severe environment, the power supply module provides conversion voltage for the underground monitoring host when the underground monitoring host works in the underground, electromagnetic signals in various frequency ranges are received by the antenna and the detector, the control module sets triggering conditions and corresponding sampling parameters of the frequency domain signal acquisition module and the time domain signal acquisition module under the control of the underground monitoring host on the ground, and stores time domain signals acquired by the time domain signal acquisition module according to the corresponding triggering conditions and the second sampling parameters and frequency domain signals acquired by the frequency domain signal acquisition module according to the corresponding triggering conditions and the second sampling parameters, so that the acquisition requirements of the electromagnetic signals in the severe environment such as underground moisture, dust and the like are simultaneously met by the explosion-proof shell, and meanwhile, the interface is designed, so that the underground monitoring host analyzes the acquired time domain signals and the acquired frequency domain signals, and the requirements of remote transmission and analysis are met.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the disclosure, nor is it intended to be used to limit the scope of the disclosure. Other features of the present disclosure will become apparent from the following specification.
Drawings
The drawings are for a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
fig. 1 is a schematic structural diagram of an electromagnetic signal monitoring device according to an embodiment of the disclosure;
fig. 2 is a schematic structural diagram of another electromagnetic signal monitoring device according to an embodiment of the disclosure;
fig. 3 is a schematic structural diagram of another electromagnetic signal monitoring device according to an embodiment of the disclosure.
Fig. 4 is a schematic structural diagram of another electromagnetic signal detection apparatus according to an embodiment of the disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below in conjunction with the accompanying drawings, which include various details of the embodiments of the present disclosure to facilitate understanding, and should be considered as merely exemplary. Accordingly, one of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
An electromagnetic signal monitoring apparatus of an embodiment of the present disclosure is described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an electromagnetic signal monitoring device according to an embodiment of the disclosure.
As shown in fig. 1, the apparatus includes: a downhole monitoring host 1000 and an uphole monitoring host 2000.
A downhole monitoring host 1000 for monitoring electromagnetic signals downhole.
The downhole monitoring host 1000 comprises an antenna 1100, a detector 1200, an explosion-proof housing 1300, and a frequency domain signal acquisition module 1310, a time domain signal acquisition module 1320, a control module 1330 and a power module 1340 which are arranged inside the explosion-proof housing 1300.
The antenna 1100 is arranged outside the explosion-proof housing 1300, is placed at a place where an electromagnetic environment needs to be collected, enters the housing through a horn mouth of the explosion-proof housing through a cable, and is connected with the frequency domain signal collection module for collecting electromagnetic signals in the environment.
The detector 1200 is arranged outside the explosion-proof housing 1300, is placed at a place where an electromagnetic environment needs to be collected, enters the housing through a horn mouth of the explosion-proof housing through a cable, and is connected with the time domain signal collection module for collecting signals. As one implementation, the probe 1200 may be a probe or a transformer.
The frequency domain signal acquisition module 1310 is connected to the antenna 1100, and is configured to convert an electromagnetic signal in the environment received by the antenna 1100 into a frequency domain signal.
A time domain signal acquisition module 1320 is connected to the detector 1200 for converting electromagnetic signals in the environment acquired by the detector 1200 into time domain signals.
The control module 1330 is connected to the frequency domain signal acquisition module 1310, and is configured to set a triggering condition and a first sampling parameter of the frequency domain signal acquired by the frequency domain signal acquisition module 1310 under the control of the uphole monitoring host 2000, and store and upload the frequency domain signal to the uphole monitoring host 2000.
The control module 1330 is further connected to the time domain signal acquisition module 1320, and configured to set a trigger condition and a second sampling parameter of the time domain signal acquired by the time domain signal acquisition module 1320, and store and upload the time domain signal to the uphole monitoring host 2000.
The power module 1340 is connected to the control module 1330, the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320, and is configured to convert an ac voltage of the downhole power source into a dc voltage corresponding to the control module 1330, the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320.
The uphole monitoring host 2000 is configured to control the control module to set a trigger condition, and control the control module to set a first sampling parameter of the frequency domain signal acquisition module 1310 and a second sampling parameter of the time domain signal acquisition module 1320, and analyze the acquired time domain signal and frequency domain signal to output an analysis result, so that the analysis result is convenient to view.
The trigger condition may be a set time trigger condition, for example, 20 minutes, that is, the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320, and the acquisition is performed every 20 minutes. The triggering condition may be electromagnetic interference generated suddenly, voltage sudden rise, sudden drop, current change and the like.
The trigger conditions for the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320 to acquire signals may be the same or different, which is not limited in this embodiment.
In the embodiment of the disclosure, the downhole monitoring host 1000 is provided with the explosion-proof housing 1300, and the explosion-proof housing meets the explosion-proof requirement of the downhole monitoring host 1000 under the conditions of high pressure and severe environment during downhole operation. Wherein, due to the specificity of the downhole environment, the AC220V voltage common to the acquisition device cannot be provided, while the power module 1340 in the present disclosure can convert the AC voltage of the downhole power source into the dc voltage required by the control module 1330, the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320 during operation. The antenna 1100 receives electromagnetic environment signals in the space environment, the electromagnetic environment signals are transmitted to the frequency domain signal acquisition module 1310 through a cable, the detector 1200 picks up the electromagnetic environment signals in the space environment, the electromagnetic environment signals are transmitted to the time domain signal acquisition module 1320 through the cable, the frequency domain signal acquisition module 1310 acquires the frequency domain signals from the antenna 1100 through the first sampling parameters of the frequency domain signal acquisition set by the control module 1330, and the time domain signal acquisition module 1320 acquires corresponding time domain signals from the detector 1200 through the second sampling parameters of the time domain signal acquisition set by the control module 1330, so that the time domain and frequency domain signals can be acquired simultaneously, the acquired electromagnetic signal data are stored and analyzed, the actual electromagnetic environment under the mine is found, the anti-interference performance of various devices under the corresponding electromagnetic environment can be enhanced in a targeted manner, and the working reliability of various devices is improved.
As one implementation, the first sampling parameters include sampling frequency and amplitude information, and the frequency domain signal acquisition module 1310 acquires frequency domain signals of the corresponding frequency and amplitude information from the antenna 1100 according to the first sampling parameters. The second sampling parameter includes sampling time and amplitude information, and according to the second sampling parameter, the time domain signal acquisition module 1320 acquires a time domain signal corresponding to the sampling time and amplitude information from the detector 1200. Based on the above embodiments, another electromagnetic signal monitoring device is provided in the present embodiment, fig. 2 is a schematic structural diagram of another electromagnetic signal monitoring device provided in the embodiment of the disclosure, and as shown in fig. 2, a plurality of antennas 1100 are provided, and a downhole monitoring host 1100 includes a radio frequency switch 1350. A power module 1340 including a power protection module 1341 and a power conversion module 1342;
the power conversion module 1342 is configured to convert an ac voltage of 127V or 660V downhole into a dc voltage corresponding to the control module 1330, the frequency domain signal acquisition module 1310 and the time domain signal acquisition module 1320.
The power protection module 1341 is configured to perform explosion-proof protection on the voltage conversion module 1342, so as to adapt to a severe environment with high pressure in the pit, and improve the stability of the operation of the downhole monitoring host 11.
A radio frequency switch 1350 is coupled to the plurality of antennas 1100 for selecting the electromagnetic signals received by the different antennas 1100. In fig. 2, only 3 antennas 1100 are shown by way of example, and in practical application, the number of antennas 1100 may be set according to requirements, which is not limited in this embodiment.
In the embodiment of the disclosure, the working environment under the mine is more complex, the frequency range of a single antenna is narrower, and the frequency range of the collected electromagnetic signals is increased by adding a plurality of antennas, in this embodiment, a radio frequency switch 1350 is added, as an implementation manner, the radio frequency switch 1350 is one, and the radio frequency switch 1350 can be switched to correspond to different antennas 1100, so as to obtain the electromagnetic signals received by the corresponding antennas 1100; as another implementation manner, the number of the rf switches 1350 is multiple, the rf switches 1350 and the antennas 1100 have a corresponding relationship, and by switching the corresponding rf switches 1350 and the corresponding antennas 1100, electromagnetic signals received by the corresponding antennas 1100 are obtained, so that flexibility of electromagnetic signal collection is improved, and a range of an electromagnetic signal collection frequency band is increased.
In one implementation manner of the embodiment of the present disclosure, the multiple antennas 1100 may receive waveform data of electromagnetic signals from 7KHz to 20GHz in the environment, and microsecond level signals on the cable, that is, signals with a time period greater than or equal to microsecond level on the cable, so as to increase the range of the electromagnetic signal acquisition frequency band.
In addition, in order to meet the requirement of heat dissipation of the downhole equipment, in the embodiment of the disclosure, the time domain acquisition module 1320 and the frequency domain acquisition module 1310 are both provided with metal shells, and the metal shells are tightly attached to the explosion-proof shell 113, so that heat generated by the time domain acquisition module 1320 and the frequency domain acquisition module 1310 during working can be conducted to the explosion-proof shell connected with the metal shells through the metal shells, and because the metal shells are tightly attached to the explosion-proof shell 1300, the conducting area is increased, and the heat dissipation effect is improved.
Based on the above embodiments, another electromagnetic signal monitoring device is provided in the embodiments of the present disclosure, and fig. 3 is a schematic structural diagram of another electromagnetic signal monitoring device provided in the embodiments of the present disclosure, as shown in fig. 3, an uphole monitoring host 2000, including a display 2100 and an upper computer 2200.
A display 2100 for displaying the frequency domain signal and the time domain signal acquired by the downhole monitoring host 1000.
The upper computer 2200 is disposed on the well, that is, on the ground, and controls the control module 1300 of the downhole monitoring host 1000 through software to set the trigger condition, the first sampling parameter and the second sampling parameter, and analyze the time domain signal and the frequency domain signal uploaded by the downhole monitoring host 1000.
In the embodiment of the disclosure, an application program is set in the upper computer 2200, the downhole monitoring host 1000 is controlled by the application program, and a frequency band of an acquired signal, a time parameter, a triggering condition and the like can be set, specifically, an instruction is sent to the control module 1330 by the application program, so that the control module 1330 controls the triggering condition of the time domain signal acquisition module 1320 and the frequency domain signal acquisition module 1310 in the downhole monitoring host for data acquisition, and the first sampling parameter and the second sampling parameter, wherein the triggering condition is, for example, a set period, so that the time domain signal acquisition module 1320 performs electromagnetic signal acquisition according to the second sampling parameter in the set period, and the frequency domain signal acquisition module 1310 performs electromagnetic signal acquisition according to the first sampling parameter in the set period, thereby realizing automatic downhole electromagnetic signal acquisition, and meanwhile, the time domain signal acquired by the time domain signal acquisition module 1320 and the frequency domain signal acquired by the frequency domain signal acquisition module 1310 are changed into optical signals through a transmission interface after being locally stored, and are transmitted to the uphole monitoring host 2000 through a connection optical cable. Further, the uphole monitoring host 2000 analyzes the data acquired from the downhole monitoring host 1000 according to the set application program and displays it through the display 2100 so as to view and analyze the electromagnetic environment signals of the test record.
It should be noted that, the control module 1330 includes a storage unit and a communication unit, and is configured to store the time domain signal acquired by the time domain signal acquisition module 1320 and the frequency domain signal acquired by the frequency domain signal acquisition module 1310, convert the time domain signal and the frequency domain signal into an optical signal through a transmission interface 1360 provided in the explosion-proof housing 1300 after data processing, and connect an optical cable to transmit the optical signal to the uphole monitoring host 2000. The transmission interface 1360 is an output optical port or a network port, and can perform long-distance transmission to the above-ground on-well monitoring host 2000, for example, tens of kilometers, so that compared with conventional USB transmission or network cable transmission, long-distance transmission can be realized. Alternatively, the transmission interface 1360 may be provided in the control module 1330.
The electromagnetic signal monitoring device can test electromagnetic signals in underground space environment and on cables, has high-speed data acquisition, storage and processing capacity, and can be matched with different antennas to receive waveform data of electromagnetic environment signals of 7KHz to 20GHz in space and microsecond mu s-level signals on the cables. The electromagnetic signal monitoring device is explosion-proof and intrinsically safe equipment, can be applied to environments with explosive gases such as coal mines, is small in volume, small in heating value, wide in frequency band for collecting electromagnetic environment signals and good in instantaneity, and can be applied to places such as underground coal mines. The device can capture and record transient interference simultaneously, comprises data such as electromagnetic interference suddenly generated in the environment, voltage sudden rise, sudden drop, current change and the like on a circuit, and can set a triggering condition to trigger the underground monitoring host to measure and record through software in the underground monitoring host.
Fig. 4 is a schematic structural diagram of another electromagnetic signal detection device according to an embodiment of the present disclosure, where in the embodiment of the present disclosure, in order to adapt to a severe underground environment, an explosion-proof and intrinsic safety type is adopted for a housing, and a sealing design of an underground monitoring host is improved, so that water vapor and dust are prevented from entering. Wherein, the cable interface that business turn over explosion-proof housing all adopts plastic material sealing block to carry out full seal installation. In order to work in a closed environment, a time domain signal acquisition module and a frequency domain signal acquisition module with low power consumption are selected, a metal heat dissipation shell is designed for the time domain signal acquisition module and the frequency domain signal acquisition module, and the time domain signal acquisition module and the frequency domain signal acquisition module are tightly attached to the explosion-proof shell. In order to meet the requirements of underground explosion-proof electrical equipment, a power switch box is arranged and used for remotely controlling the power on of an underground monitoring host, an explosion-proof power protection module is designed for a power supply, and a power conversion module is designed for adapting to underground power supply voltage to convert the voltage.
It should be noted that the description of the downhole monitoring host and the uphole monitoring host in the electromagnetic signal detection apparatus is also applicable to the present embodiment, and is not repeated here.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps recited in the present disclosure may be performed in parallel, sequentially, or in a different order, provided that the desired results of the disclosed aspects are achieved, and are not limited herein.
The above detailed description should not be taken as limiting the scope of the present disclosure. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure are intended to be included within the scope of the present disclosure.
Claims (8)
1. An electromagnetic signal monitoring device, comprising: the underground monitoring system comprises an underground monitoring host and an underground monitoring host, wherein the underground monitoring host comprises an antenna, a detector, an explosion-proof shell, and a frequency domain signal acquisition module, a time domain signal acquisition module, a control module and a power module which are arranged in the explosion-proof shell;
the antenna is arranged outside the explosion-proof shell and is used for receiving electromagnetic signals in the environment;
the detector is arranged outside the explosion-proof shell and is used for collecting electromagnetic signals in the environment;
the frequency domain signal acquisition module is connected with the antenna and used for converting electromagnetic signals in the environment received by the antenna into frequency domain signals;
the time domain signal acquisition module is connected with the detector and used for converting electromagnetic signals in the environment acquired by the detector into time domain signals;
the on-well monitoring host is used for controlling the control module to set a triggering condition, controlling the control module to set a first sampling parameter of the frequency domain signal acquisition module and a second sampling parameter of the time domain signal acquisition module, and analyzing the acquired time domain signal and the acquired frequency domain signal;
the control module is connected with the frequency domain signal acquisition module and is used for setting the triggering condition and the first sampling parameter of the frequency domain signal acquired by the frequency domain signal acquisition module under the control of the uphole monitoring host, and storing and uploading the frequency domain signal to the uphole monitoring host;
the control module is also connected with the time domain signal acquisition module and is used for setting the triggering condition and the second sampling parameter of the time domain signal acquired by the time domain signal acquisition module, and storing and uploading the time domain signal to the uphole monitoring host;
the power module is connected with the control module, the frequency domain signal acquisition module and the time domain signal acquisition module and is used for converting alternating current voltage of the underground power supply into direct current voltage corresponding to the control module, the frequency domain signal acquisition module and the time domain signal acquisition module.
2. The monitoring device of claim 1, wherein the antenna is a plurality of; the underground monitoring host comprises a radio frequency switch;
the radio frequency switch is connected with the plurality of antennas and used for selecting electromagnetic signals received by different antennas.
3. The monitoring device of claim 1, wherein the power module comprises a power protection module and a power conversion module;
the power supply conversion module is used for converting the underground 127V or 660V alternating voltage into direct voltage corresponding to the control module, the frequency domain signal acquisition module and the time domain signal acquisition module;
the power supply protection module is used for carrying out explosion-proof protection on the power supply conversion module.
4. The monitoring device of claim 1, wherein,
the on-well monitoring host comprises a display and an upper computer;
the display is used for displaying the frequency domain signals and the time domain signals acquired by the underground monitoring host;
the upper computer is arranged on the well, the control module of the underground monitoring host is controlled through an application program, the triggering condition, the first sampling parameter and the second sampling parameter are set, and the time domain signal and the frequency domain signal uploaded by the underground monitoring host are analyzed.
5. The monitoring device of claim 2, wherein the plurality of antennas are configured to receive waveform data of electromagnetic signals of 7KHz to 20GHz in an environment and microsecond level signals on a cable.
6. The monitoring device of claim 2, wherein the time domain signal acquisition module and the frequency domain signal acquisition module are each provided with a metal housing, and the metal housing is in close proximity to the explosion-proof housing.
7. The monitoring device of any one of claims 1-6, wherein the detector comprises one of a probe and a transformer.
8. The monitoring device of any of claims 1-6, wherein the first sampling parameter comprises sampling frequency and amplitude information and the second sampling parameter comprises sampling time and amplitude information.
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| WO2017178878A1 (en) * | 2016-04-13 | 2017-10-19 | Universitat Politecnica De Catalunya | A full time-domain method for analyzing two or more signals for assessing them as electromagnetic interference (emi) |
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| US20060043979A1 (en) * | 2002-12-16 | 2006-03-02 | Wei Wu | Emi measuring method and its system |
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