An integrated power frequency electromagnetic field sensor and online monitoring device

Abstract

The present invention provides an integrated power frequency electromagnetic field sensor and an online monitoring device, including a sensor assembly, wherein the integrated power frequency electromagnetic field sensor is connected to a field strength meter host and transmits the collected power frequency electromagnetic field data to the field strength meter host, and the field strength meter host receives the data collected by the integrated power frequency electromagnetic field sensor and the three-dimensional radio frequency electric field sensor, performs calculation and display, and inputs the calculation result into a central control computer, and the central control computer receives the calculation result of the field strength meter host arranged in various places and displays it through the large LED screen of the control center, so as to realize the online monitoring of the electromagnetic field. The present invention uses a laser and a silicon optical chip to form a photoelectric converter, and uses optical fiber for transmission, so as to achieve the purpose of interference-free power supply of the measuring sensor. The interference of metal objects to the sensor measurement signal is overcome, the interference of electromagnetic waves in the induction space is avoided, and the accuracy of the measurement data is ensured. The device is industrially designed and has a beautiful appearance.

Description

Technical Field

[0001] The invention relates to the technical field of electric field measurement, in particular to an integrated industrial frequency electromagnetic field sensor and an online monitoring device. Background Art

[0002] With the development of economic construction and the progress of science and technology, my country has made gratifying achievements in power equipment, communication networks, transportation, etc. The development of various fields and the application of advanced electronic equipment have made people's lives faster and more convenient, and improved people's material and cultural living standards, which also requires people to study how to measure and protect against electromagnetic radiation.

[0003] Electromagnetic field radiation exceeding a certain intensity will cause dysfunction of the central nervous system and autonomic nervous system disorders with sympathetic nerve fatigue and tension as the main symptoms. Its clinical symptoms may include dizziness, insomnia, fatigue, memory loss, palpitations, headaches, limb pain, loss of appetite, hair loss, sweating, etc. Some people may also experience bradycardia, decreased blood pressure, and arrhythmia. Electromagnetic fields are silent, lightless, and odorless fields. People cannot feel them unless they reach a very strong level. Therefore, this hazard is very "hidden" and is often not noticed or taken seriously by people. In order to protect people's health, the state has formulated corresponding laws, regulations and national standards. For the management of electromagnetic radiation environment, the state has relatively systematic laws and regulations and standards. Wuhan Bihai Yuntian Technology Co., Ltd. has developed a handheld field strength meter (electromagnetic field radiation meter) and an electromagnetic field online monitoring system based on the corresponding laws, regulations and national standards. The successful development of this instrument and online monitoring system provides an effective and scientific basis for law enforcement by government functional departments such as environmental monitoring, safety supervision, and occupational disease prevention and control, and will be widely used in industrial and mining enterprises, labor protection, occupational disease prevention and control, environmental monitoring and other departments.

[0004] At present, electromagnetic radiation is usually measured with a portable electromagnetic field meter. With the enhancement of people's environmental awareness, the society and the public have a better understanding of the living environment and radiation hazards, and require a healthy living environment. They will pay more attention to facilities involving radiation hazards. The country attaches great importance to environmental protection. For substations, communication base stations, and large-scale equipment with electromagnetic radiation, people need long-term real-time online monitoring, and publish information on electromagnetic radiation in related areas and the limit values ​​allowed by national standards through large screens or public information platforms. At the same time, they are transmitted to the environmental protection functional management department through the network to monitor and manage radiation conditions. The public can more intuitively and correctly understand the size of electromagnetic field radiation near substations, communication base stations and other facilities, and avoid psychological panic among the public around the facilities.

[0005] The online monitoring system requires that the monitoring data is accurate and can work uninterruptedly for a long time during the monitoring process. The original portable electromagnetic field strength meter power frequency probe has a built-in battery and circuit board. The probe circuit board and battery are placed in a square hexahedron, and the plates and coil components perpendicular to each other are installed on the hexahedron. There is an optical fiber output communication interface on the plate side and a charging socket for repeated charging. There is no metal wire outside the probe except the plates and coils for sensing, and there is no interference caused by metal wires. However, in the real-time online monitoring process, it is unattended, and people only look at the data results displayed on the large screen. If the online sensor is powered by a battery, there must be a time when the power is exhausted and needs to be charged, which makes it unable to work continuously for a long time. If the charger is connected to charge and power supply, the metal wire will sense the electromagnetic waves in space like an antenna; if the sensor is not powered by a battery and is designed to be powered by an external AC to DC power supply, the power cord will have the same problem. Facts have proved that this external metal wire senses the electromagnetic waves in space and brings interference, causing the measurement results to bring hundreds or thousands of times errors, and the displayed data is unstable, and the electromagnetic waves in space also interfere with the circuit board. How to solve the problem of sensor power supply and electromagnetic wave interference on circuit boards? This is the problem to be solved by this invention. Electromagnetic field measurement sensors need to be placed in an open space without shelter for a long time. The sensor device needs to withstand the test of sun and rain, and the device material must be corrosion-resistant and anti-aging. In order to ensure the measurement sensitivity of the sensor, the shell material must also have the smallest possible blocking and attenuation characteristics for electromagnetic waves! How to design a good electromagnetic field sensor device? This is a task that must be solved for online electromagnetic field monitoring. Summary of the invention

[0006] The purpose of the present invention is to provide an integrated industrial frequency electromagnetic field sensor and an online monitoring device, which solves the power supply and corresponding interference problems of the sensor, overcomes the problems of reduced sensitivity, and ensures that the electromagnetic field monitoring data of the online monitoring system is accurate and the system works stably and uninterruptedly for a long time.

[0007] The technical solution of the present invention is as follows: an integrated industrial frequency electromagnetic field sensor, including a sensor assembly, a sensor cap is arranged above the sensor assembly, a bottom cover is installed below the sensor assembly, the sensor cap and the bottom cover cooperate to completely cover the sensor assembly, an upper support tube is connected below the bottom cover, the lower end of the upper support tube is connected to the upper end of the lower support tube through an intermediate connecting seat, the lower end of the lower support tube is connected to the bottom support seat, the bottom support seat is fastened and installed on a prefabricated base, a pre-buried cable is arranged in the prefabricated base, one end of the pre-buried cable passes through the upper support tube and the lower support tube to be connected to the sensor assembly, and the other end is connected to a field strength meter through an optical fiber.

[0008] The sensor assembly is supported in the sensor cap by nylon support columns, and the sensor cap and the bottom cover are connected together by nylon screws.

[0009] The top end of the nylon support column is connected to the aluminum square integrated block serving as a support frame through a nylon stud. An optical fiber adapter circuit board is fixedly installed on the aluminum square integrated block through screws. An optical fiber RX socket and an optical fiber TX socket are arranged on the optical fiber adapter circuit board. The optical fiber RX socket and the optical fiber TX socket are connected to an optical fiber connector. A photocell is fixedly installed on the aluminum square integrated block through a countersunk screw. The photocell is connected to a laser transmission optical fiber connector. Both the optical fiber connector and the laser transmission optical fiber connector are connected to the pre-buried cable. X-axis parallel plates, Y-axis parallel plates and Z-axis parallel plates are installed on three adjacent sides of the aluminum square integrated block. A coil assembly is installed on the other three sides of the aluminum square integrated block. The coil assembly is installed on the aluminum square integrated block through nylon screws. The connection between the X-axis parallel plates, the Y-axis parallel plates and the Z-axis parallel plates is connected with insulating tape. A front shielding plate is installed between the Z-axis parallel plates and the aluminum square integrated block. A rear shielding plate is installed between the coil assembly corresponding to the Z-axis parallel plates and the aluminum square integrated block. A space is left between the rear shielding plate and the aluminum square integrated block for placing a sensor circuit board.

[0010] A silicone plate is padded between the optical fiber switching circuit board and the aluminum square integrated block, and a nylon support cylinder is padded between the aluminum square integrated block and the coil assembly.

[0011] The sensor circuit board is fixed on the aluminum square integrated block through the cooperation of short connecting hexagonal columns and long connecting hexagonal columns, and the outer side of the rear shielding plate is locked with countersunk screws to the rear shielding plate, the short connecting hexagonal columns and the long connecting hexagonal columns.

[0012] The aluminum square integrated block is provided with a photocell mounting hole for mounting a photocell, a coil assembly mounting hole for mounting a coil assembly, a socket connecting wire hole for passing the connecting wires of the optical fiber RX socket and the optical fiber TX socket and the sensor circuit board, a wire through hole for passing the wires, a pole plate mounting hole for mounting a parallel pole plate, and a shielding plate mounting hole for mounting a shielding plate.

[0013] The coil assembly includes a wire wheel on which a coil is tightly wound, and a coil wire passing groove is provided on the outer edge of the wire wheel; a connecting hole is provided around the lower end of the sensor cover cap, and screw holes corresponding to the connecting holes are provided around the bottom cover. Nylon screws pass through the screw holes and are screwed into the connecting holes to connect the sensor cover cap and the bottom cover into one piece. The bottom cover is also provided with an installation groove for installing a nylon support column and a support tube connector for connecting to an upper support tube.

[0014] An electromagnetic field online monitoring device comprises the above-mentioned integrated industrial frequency electromagnetic field sensor, wherein the integrated industrial frequency electromagnetic field sensor is connected to a field strength meter host and transmits the collected industrial frequency electromagnetic field data to the field strength meter host, and the field strength meter host is also connected to a three-dimensional radio frequency electric field sensor to receive the data collected by the three-dimensional radio frequency electric field sensor. After receiving the data collected by the integrated industrial frequency electromagnetic field sensor and the three-dimensional radio frequency electric field sensor, the field strength meter host performs calculation and display and inputs the calculation result into a central control computer, and the central control computer receives the calculation result of the field strength meter host arranged in various places and displays it through the large LED screen of the control center, thereby realizing electromagnetic field online monitoring.

[0015] The integrated industrial frequency electromagnetic field sensor is also connected to a laser generator, and the laser generator transmits laser light to the sensor component through a pre-buried cable to provide energy to the photocell.

[0016] The integrated industrial frequency electromagnetic field sensor is connected to the optical fiber connector through the optical fiber RX socket and the optical fiber TX socket and is connected to the pre-buried cable to be connected to the field strength meter host.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] The power frequency electromagnetic field sensor uses a laser and a silicon photon chip to form a photoelectric converter, which is transmitted by optical fiber to achieve the purpose of interference-free power supply for the measuring sensor. It overcomes the interference of metal objects on the sensor measurement signal, avoids the interference of electromagnetic waves in the induction space, and ensures the accuracy of the measurement data; the sensor of the electromagnetic field online monitoring device of the present invention uses an integrated block to integrate various components, with a compact structure, optimized line wiring, and avoids interference caused by wire crossing, improving the stability and accuracy of sensor measurement; the sensor device structural design and component material selection overcome the electromagnetic wave interference in the induction space caused by the material; three mutually perpendicular detection coils are integrated to form a three-dimensional power frequency magnetic field sensor, and three mutually perpendicular parallel plates are integrated to form a three-dimensional power frequency electric field sensor, so that the sensor can be placed in any direction, the total amount of electromagnetic field strength remains unchanged, and the electric field and magnetic field are measured simultaneously in three directions; the device has an industrial design and a beautiful appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the structure of the integrated power frequency electromagnetic field sensor of the present invention;

[0020] Figure 2 This is a schematic diagram of the installation structure of the sensor assembly of the present invention;

[0021] Figure 3 This is a schematic diagram of the front cross-sectional structure of the sensor assembly of the present invention;

[0022] Figure 4 It is a schematic diagram of the side cross-sectional structure of the sensor assembly of the present invention;

[0023] Figure 5 This is a schematic diagram of the aluminum square integrated block structure of the present invention;

[0024] Figure 6 It is a schematic diagram of the structure of the coil assembly of the present invention;

[0025] Figure 7 This is a schematic diagram of the sensor cap structure of the present invention;

[0026] Figure 8 This is a schematic diagram of the bottom cover structure of the present invention;

[0027] Fig. 9 It is a schematic block diagram of the structure of the online monitoring device of the present invention.

[0028] In the figure: 1-sensor assembly, 2-sensor cover, 3-bottom cover, 4-upper support tube, 5-middle connecting seat, 6-lower support tube, 7-bottom support seat, 8-prefabricated base, 9-pre-buried cables, 10-nylon screws, 11-nylon support columns, 12-nylon studs, 13-aluminum square integrated blocks, 14-screws, 15-optical fiber adapter circuit board, 16-optical fiber RX socket, 17-optical fiber TX socket, 18-optical fiber connector, 19-countersunk screws, 20-photocell, 21-laser transmission optical fiber connector, 22-Y-axis parallel plates, 23-X-axis parallel plates, 24-Z-axis parallel plates, 25-coil assembly, 26-insulating tape, 27-silicone plate, 28-front shielding plate, 29- Rear shielding plate, 30-short connecting hexagonal column, 31-long connecting hexagonal column, 32-nylon support tube, 33-sensor circuit board, 130-photocell mounting hole, 131-coil assembly mounting hole, 132-socket connection wire hole, 133-wire through hole, 134-plate mounting hole, 135-shielding plate mounting hole, 200-connection hole, 300-screw hole, 301-mounting slot, 302-support tube connector, 250-reel, 251-coil, 252-coil wire through slot, 100-integrated industrial frequency electromagnetic field sensor, 101-field strength meter host, 102-three-dimensional radio frequency electric field sensor, 103-central control computer, 104-LED large screen, 105-laser generator. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1An integrated industrial frequency electromagnetic field sensor includes a sensor component 1, a sensor cap 2 is arranged above the sensor component, a bottom cover 3 is installed below the sensor component 1, the sensor cap 2 and the bottom cover 3 cooperate to completely cover the sensor component 1, an upper support tube 4 is connected below the bottom cover 3, the lower end of the upper support tube 4 is connected to the upper end of the lower support tube 6 through an intermediate connecting seat 5, the lower end of the lower support tube 6 is connected to a bottom support seat 7, and the bottom support seat 7 is fastened and installed on a prefabricated base 8, and a pre-buried cable 9 is arranged in the prefabricated base 8, one end of the pre-buried cable 9 passes through the upper support tube 4 and the lower support tube 6 to be connected to the sensor component 1, and the other end is connected to a field strength meter through an optical fiber.

[0031] The sensor assembly 1 is supported in the sensor cap 2 by a nylon support column 11 , and the sensor cap 2 and the bottom cover 3 are connected together by a nylon screw 10 .

[0032] The top of the nylon support column 11 is connected to the aluminum square integrated block 13 as a support frame through a nylon stud 12. A fiber optic transfer circuit board 15 is fixedly installed on the aluminum square integrated block 13 through screws 14. A fiber optic RX socket 16 and a fiber optic TX socket 17 are provided on the fiber optic transfer circuit board 15. The fiber optic RX socket 16 and the fiber optic TX socket 17 are connected to a fiber optic connector 18. A photocell 20 is fixedly installed on the aluminum square integrated block 13 through countersunk screws 19. The photocell 20 is connected to a laser transmission fiber optic connector 21. The fiber optic connector 18 and the laser transmission fiber optic connector 21 are both connected to the pre-buried cable 9. X optical fiber connectors are installed on three adjacent sides of the aluminum square integrated block 13. The aluminum square integrated block 13 is provided with a coil assembly 25 on the other three surfaces thereof, and the coil assembly 25 is installed on the aluminum square integrated block 13 by means of nylon screws 10. The X-axis parallel plates 23, the Y-axis parallel plates 22 and the Z-axis parallel plates 24 are connected at the joints by means of insulating tape 26. A front shielding plate 28 is installed between the Z-axis parallel plates 24 and the aluminum square integrated block 13. A rear shielding plate 29 is installed between the coil assembly 25 corresponding to the Z-axis parallel plates 24 and the aluminum square integrated block 13. A space is left between the rear shielding plate 29 and the aluminum square integrated block for placing a sensor circuit board 33.

[0033] A silicone plate 27 is provided between the optical fiber switching circuit board 15 and the aluminum square integrated block 13 , and a nylon support tube 32 is provided between the aluminum square integrated block 13 and the coil assembly 25 .

[0034] The sensor circuit board 33 is fixed on the aluminum square integrated block 13 by the cooperation of the short connecting hexagonal column 30 and the long connecting hexagonal column 31. The outer side of the rear shielding plate 29 is locked by the countersunk screws 19 to the rear shielding plate 29, the short connecting hexagonal column 30 and the long connecting hexagonal column 31.

[0035] The aluminum square integrated block 13 is provided with a photocell mounting hole 130 for mounting the photocell 20, a coil assembly mounting hole 131 for mounting the coil assembly 25, a socket connecting wire hole 132 for the optical fiber RX socket 16 and the optical fiber TX socket 17 to pass the connecting wires with the sensor circuit board 33, a wire through hole 133 for the wires to pass through, a pole plate mounting hole 134 for mounting parallel pole plates, and a shielding plate mounting hole 135 for mounting a shielding plate.

[0036] The coil assembly 25 includes a reel 250, on which a coil 251 is tightly wound, and a coil wire passing groove 252 is also provided on the outer edge of the reel 250; a connecting hole 200 is provided around the lower end of the sensor cap 2, and a screw hole 300 corresponding to the connecting hole 200 is provided around the bottom cover 3. The nylon screw 10 passes through the screw hole 300 and is screwed into the connecting hole 200 to connect the sensor cap 2 and the bottom cover 3 into one body. The bottom cover 3 is also provided with an installation groove 301 for installing a nylon support column 11 and a support tube connector 302 for connecting to the upper support tube 4.

[0037] An electromagnetic field online monitoring device includes the integrated power frequency electromagnetic field sensor 100 described above. The integrated power frequency electromagnetic field sensor 100 is connected to a field strength meter host 101 and transmits the collected power frequency electromagnetic field data to the field strength meter host 101. The field strength meter host 101 is also connected to a three-dimensional radio frequency electric field sensor 102 to receive the data collected by the three-dimensional radio frequency electric field sensor 102. After receiving the data collected by the integrated power frequency electromagnetic field sensor 100 and the three-dimensional radio frequency electric field sensor 102, the field strength meter host 101 calculates and displays the data and inputs the calculation results into a central control computer 103. The central control computer 103 receives the calculation results of the field strength meter hosts 101 set up in various places and displays them through the LED large screen 103 of the control center, thereby realizing electromagnetic field online monitoring.

[0038] The integrated industrial frequency electromagnetic field sensor 100 is also connected to a laser generator 105 , and the laser generator 105 transmits laser light to the sensor assembly 1 through the pre-buried cable 9 to provide energy to the photocell 20 .

[0039] The integrated industrial frequency electromagnetic field sensor 100 is connected to the optical fiber connector 18 through the optical fiber RX socket 16 and the optical fiber TX socket 17 and connected to the pre-buried cable 9 to be connected to the field strength meter host 101.

[0040] The aluminum square integrated block 13 is used to integrate the various components of the sensor into one, making the sensor structure compact, the transmission wire wiring reasonable and neat, the shielding effect good, and improving the overall performance of the sensor. The shielding plate is divided into a front shielding plate and a rear shielding plate, which are installed at the corresponding position of the integrated block to form a shielding chamber to prevent interference from electromagnetic waves in space. The sensor circuit board assembly is used to collect power frequency electric field and magnetic field signals, and output digital signals after single-chip microcomputer data processing. There are three parallel plates installed on the three mutually perpendicular faces of the hexahedral integrated block to sense power frequency electric field strength signals (EX / EY / EZ).

[0041] Material: Epoxy double-sided silver-coated board, mechanical processing, chemical corrosion molding.

[0042] The plate is 65mm-75mm long and 65mm-75mm wide, and the distance between the two plates is 0.1mm-0.3mm.

[0043] When forming three mutually perpendicular surfaces, the three corner points of the inner surface are soldered together so that the three inner surfaces constitute a potential equipotential body, i.e. a common end, which also plays a stabilizing role.

[0044] There are three coil assemblies installed on three mutually perpendicular faces of the hexahedron opposite to the three parallel pole plates, for sensing power frequency magnetic field strength signals (BX / BY / BZ).

[0045] Wire wheel: Made of nylon, formed by mold pressing;

[0046] Coil: Copper core enameled wire with a wire diameter of φ0.1~φ0.2mm and 220~280 turns.

[0047] When the photocell is irradiated with a constant laser intensity, it generates a voltage of 6.7 to 6.9 V, which is stabilized to 5 V by a voltage stabilizing circuit, and then converted to 3.3 V by a DC-DC converter to supply the sensor circuit.

[0048] The nylon support column is used for the bottom cover of the sensor component connection device. There is a height space of 40 to 60 mm between the optical fiber socket and the bottom outlet of the bottom cover to ensure that the optical fiber has a certain bending radius to prevent the optical fiber from being bent.

[0049] Sensor cap: used to protect against wind, rain, sun and dust, requires good wave transmission, and is made of polytetrafluoroethylene.

[0050] Bottom cover: used to connect the sensor cap, support the sensor assembly, connect the fastening screws with nylon screws, and connect the upper support tube at the bottom, and the two are bonded with PVC glue.

[0051] Upper support tube: used to connect the bottom cover and the middle connecting seat. The connection is bonded with PVC glue and plays a supporting role. The tube is the channel for optical fiber cables.

[0052] Middle connecting seat: used to connect the upper and lower support tubes, and the connection is bonded with PVC glue.

[0053] Lower support tube: used to connect the lower support tube and the bottom support. The connection is bonded with PVC glue to play a supporting role. The tube is the channel for optical fiber cables.

[0054] Bottom support: used to connect the lower support pipe. The connection is bonded with PVC glue to stabilize and resist overturning. The bottom is connected to the prefabricated base with bolt fasteners.

[0055] Prefabricated base: used to install the bottom support of the sensor device, which plays a role in stability and flood prevention. When prefabricating the base, pre-buried pipelines and pre-buried mounting bolts according to the position of the bottom support mounting holes.

[0056] Materials: Made of sand, stone and cement.

[0057] Specifications: Length 400-500mm, Width 400-500mm, Height 300-400mm

[0058] The key component, the power frequency electromagnetic field measurement probe, consists of three pairs of mutually orthogonal parallel plates, three pairs of mutually orthogonal coils, and a circuit board. See the power frequency probe assembly diagram:

[0059] Power frequency electromagnetic field measurement principle

[0060] The power frequency magnetic field measurement is composed of three mutually perpendicular detection coils to form a three-dimensional power frequency magnetic field sensor. When the detection coil enters the magnetic field, the corresponding magnetic induction intensity can be determined by measuring the induced electromotive force of the detection coil. The three-way voltage signal of the induced electromotive force measured by the three coils is sent to the amplifier for processing through a multi-way switch, converted into a digital signal by A / D, and sent to the single-chip microcomputer for calculation and processing. The result is sent to the handheld host single-chip microcomputer for processing through an optical fiber, and sent to the display to display the components Bx, By, Bz and B (the square root of the sum of the squares of the three components) in the three directions of the X-axis, Y-axis and Z-axis.

[0061] The power frequency electric field measurement is composed of three mutually perpendicular parallel plates to form a three-dimensional power frequency electric field sensor. When the detection parallel plate enters the electric field, the corresponding electric field strength can be determined by measuring the voltage at both ends of the detection parallel plate. The three-way voltage signal of the voltage at both ends of the three mutually perpendicular parallel plates is sent to the amplifier for processing through a multi-way switch, converted into a digital signal by A / D, sent to the single-chip microcomputer for calculation and processing, and the result is sent to the handheld host single-chip microcomputer for processing through an optical fiber, and sent to the display to display the components Ex, Ey, Ez and E (the square root of the sum of the squares of the three components) in the three directions of the X-axis, Y-axis and Z-axis.

[0062] Working process

[0063] Working process of electromagnetic field online monitoring system:

[0064] ①Install the power frequency electromagnetic field sensor probe at the measuring point as required;

[0065] ② Turn on the power supply, and the laser will supply power to the industrial frequency electromagnetic field sensor through optical fiber photoelectric conversion, so that it is in normal measurement state;

[0066] ③The electrical signal measured by the sensor is amplified and A / D converted inside the device and sent to the central control computer for processing;

[0067] ④Send the measurement results to the large screen for real-time display.

[0068] Manufacturing and production process

[0069] Process and assemble various components according to the design drawings and process documents, and complete the system engineering installation according to the technical requirements.

[0070] Calibration: Before being installed in the system, the power frequency electromagnetic field sensor is calibrated on special instruments such as Helmholtz coils and parallel plates to meet the measurement range and accuracy requirements.

[0071] Debugging: After all instruments and components of the system are assembled, debug each signal path to ensure that the entire system reaches normal measurement, signal transmission and display status.

[0072] Technical points and differences from similar products

[0073] ① The power frequency measurement probe uses laser and silicon photonic chip to form a photoelectric converter, which is transmitted by optical fiber to achieve the purpose of interference-free power supply for the measurement sensor. It overcomes the interference of metal objects on the sensor measurement signal, avoids electromagnetic wave interference in the induction space, and ensures the accuracy of the measurement data.

[0074] ②Main points for selecting probe materials: Probe materials are required to have a certain strength and be able to be used under harsh natural conditions such as sun and rain; at the same time, they must meet the signal detection requirements. If the material attenuates the detection signal too much, the sensor will not be able to detect weak signals, which will reduce the sensitivity of the sensor. A large number of material selection experiments have proved that polytetrafluoroethylene materials have relatively small attenuation of electromagnetic wave signals and can meet the strength and anti-aging requirements.

[0075] ③The sensor measures in three directions simultaneously.

[0076] ④Comparison of this system with similar products: The existing product sensor power supply adopts AC to DC power supply through metal wires, which will definitely be interfered by electromagnetic radiation. The processing method after interference is usually coefficient correction, but when the electromagnetic radiation intensity changes, it cannot be corrected with a fixed coefficient in different radiation intensity ranges, and there will be nonlinear problems, which will bring great errors to the measurement results. However, using photoelectric conversion power supply can effectively and truly measure the intensity of electromagnetic field radiation.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An integrated power frequency electromagnetic field sensor, Features: It includes a sensor assembly, a sensor cap is arranged above the sensor assembly, a bottom cover is installed below the sensor assembly, the sensor cap and the bottom cover cooperate to completely cover the sensor assembly, an upper support tube is connected below the bottom cover, the lower end of the upper support tube is connected to the upper end of the lower support tube through an intermediate connecting seat, the lower end of the lower support tube is connected to the bottom support seat, the bottom support seat is fastened and installed on a prefabricated platform, a pre-buried cable is arranged inside the prefabricated platform, one end of the pre-buried cable passes through the upper support tube and the lower support tube to be connected to the sensor assembly, and the other end is connected to a field strength meter through an optical fiber; The sensor assembly is supported in the sensor cap by a nylon support column, and the sensor cap and the bottom cover are connected together by nylon screws; The top of the nylon support column is connected to the aluminum square integrated block as a support frame through a nylon stud, and an optical fiber adapter circuit board is fixedly installed on the aluminum square integrated block by screws. An optical fiber RX socket and an optical fiber TX socket are provided on the optical fiber adapter circuit board. The optical fiber RX socket and the optical fiber TX socket are connected to the optical fiber connector, and a photocell is fixedly installed on the aluminum square integrated block by a countersunk screw, and the photocell is connected to a laser transmission optical fiber connector, and the optical fiber connector and the laser transmission optical fiber connector are both connected to the pre-buried cable, and X-direction parallel plates, Y-direction parallel plates and Z-direction parallel plates are installed on three adjacent sides of the aluminum square integrated block, and a coil assembly is installed on the other three sides of the aluminum square integrated block, and the coil assembly is installed on the aluminum square integrated block through nylon screws, and the connection between the X-direction parallel plates, the Y-direction parallel plates and the Z-direction parallel plates is connected with an insulating tape, and a front shielding plate is installed between the Z-direction parallel plates and the aluminum square integrated block, and a rear shielding plate is installed between the coil assembly corresponding to the Z-direction parallel plates and the aluminum square integrated block, and a space is left between the rear shielding plate and the aluminum square integrated block for placing a sensor circuit board; A silicone plate is placed between the optical fiber switching circuit board and the aluminum square integrated block, and a nylon support tube is placed between the aluminum square integrated block and the coil assembly; The nylon support column is used for the bottom cover of the sensor component connection device. There is a height space of 40~60mm between the optical fiber socket and the bottom outlet of the bottom cover to ensure that the optical fiber has a certain bending radius to prevent the optical fiber from being bent. The sensor circuit board is fixed on the aluminum square integrated block by the cooperation of the short connecting hexagonal column and the long connecting hexagonal column, and the outer side of the rear shielding plate is locked with the short connecting hexagonal column and the long connecting hexagonal column by countersunk screws; The aluminum square integrated block is provided with a photocell mounting hole for mounting a photocell, a coil assembly mounting hole for mounting a coil assembly, a socket connection wire hole for passing the optical fiber RX socket and the optical fiber TX socket and the sensor circuit board connecting wire, a wire through hole for passing the wire, a plate mounting hole for mounting a parallel plate, and a shielding plate mounting hole for mounting a shielding plate; The coil assembly includes a wire wheel on which a coil is tightly wound, and a coil wire passing groove is provided on the outer edge of the wire wheel; a connecting hole is provided around the lower end of the sensor cover cap, and screw holes corresponding to the connecting holes are provided around the bottom cover. Nylon screws pass through the screw holes and are screwed into the connecting holes to connect the sensor cover cap and the bottom cover into one piece. The bottom cover is also provided with an installation groove for installing a nylon support column and a support tube connector for connecting to an upper support tube.

2. An electromagnetic field online monitoring device, Features: It includes the integrated industrial frequency electromagnetic field sensor as described in claim 1, the integrated industrial frequency electromagnetic field sensor is connected to the field strength meter host and transmits the collected industrial frequency electromagnetic field data to the field strength meter host, the field strength meter host is also connected to the three-dimensional radio frequency electric field sensor to receive the data collected by the three-dimensional radio frequency electric field sensor, the field strength meter host receives the data collected by the integrated industrial frequency electromagnetic field sensor and the three-dimensional radio frequency electric field sensor, calculates and displays the data and inputs the calculation results into the central control computer, the central control computer receives the calculation results of the field strength meter hosts set up in various places and displays them through the large LED screen of the control center, so as to realize online monitoring of the electromagnetic field.

3. The electromagnetic field online monitoring device according to claim 2, Features: The integrated industrial frequency electromagnetic field sensor is also connected to a laser generator, and the laser generator transmits laser light to the sensor component through a pre-buried cable to provide energy to the photocell.

4. The electromagnetic field online monitoring device according to claim 2, Features: The integrated industrial frequency electromagnetic field sensor is connected to the optical fiber connector through the optical fiber RX socket and the optical fiber TX socket and is connected to the pre-buried cable to be connected to the field strength meter host.

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