CN114859139B - Outdoor transmission line electromagnetic field measuring device - Google Patents
Outdoor transmission line electromagnetic field measuring device Download PDFInfo
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- CN114859139B CN114859139B CN202210786936.6A CN202210786936A CN114859139B CN 114859139 B CN114859139 B CN 114859139B CN 202210786936 A CN202210786936 A CN 202210786936A CN 114859139 B CN114859139 B CN 114859139B
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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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- 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
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
Abstract
The invention relates to an electromagnetic field measuring device for an outdoor power transmission line, and belongs to the technical field of magnetic field measurement. The device comprises a base, wherein the interior of the base is hollowed to form a cavity, and a round hole communicated with the cavity is formed in the center of the top surface of the base; the hollow round balls are adhered and fixed in the round holes through glue, one half of each hollow round ball is positioned outside the base, and the hollow round balls positioned outside the base form hemispherical bulges; the deformation layer is made of magnetostrictive materials and covers the hemispherical bulges; the tube body is connected to the top surface of the base and is vertical to the top surface of the base, the tube body is communicated with the cavity in the base, one end of the tube body, which is far away from the base, is sealed, and a convex tube is fixedly arranged on the side wall of the tube body and is communicated with the tube body; the pinhole camera is arranged at the pipe orifice of the convex pipe and used for plugging the convex pipe, and faces the deformation layer; the hollow ball, the convex pipe, the pipe body and the cavity of the base are all provided with phase-change gel. Through above-mentioned structure, the device can measure the magnetic field intensity of power transmission line more accurately.
Description
Technical Field
The invention belongs to the technical field of magnetic field measurement, and particularly relates to an electromagnetic field measuring device for an outdoor power transmission line.
Background
When the power transmission line transmits power, a special invisible magnetic field, namely an electromagnetic field, is generated around the power transmission line. The accurate measurement of the electromagnetic field generated by the power transmission line not only guarantees the safety of line maintenance personnel, but also can know whether the current and voltage transmitted in the power transmission line are in compliance.
At present, the magnetic field intensity around the power transmission line is mainly measured through a magnetic field sensor, most of the magnetic field sensors in the prior art are designed based on electromagnetic induction, weak current is generated inside the sensor by means of the magnetic field around the power transmission line, and the weak current is amplified and converted to output a visual signal. The process is essentially electromagnetic conversion, and a micro magnetic field can be generated by weak current generated in the sensor in the conveying process, so that the interference is caused to the magnetic field to be measured generated by the power transmission line, and the measurement precision is further influenced.
Based on this, an outdoor transmission line magnetic field measuring device that measurement accuracy is higher awaits emergence urgently.
Disclosure of Invention
The invention provides an electromagnetic field measuring device for an outdoor power transmission line, which is used for solving the technical problem that the precision of measuring an electromagnetic field of the outdoor power transmission line by a magnetic field sensor in the prior art is not high.
The invention is realized by the following technical scheme: an outdoor transmission line electromagnetic field measuring device, comprising:
the inner part of the base is hollowed to form a cavity, and a round hole communicated with the cavity is formed in the center of the top surface of the base;
the hollow round ball is fixedly adhered in the round hole through glue, one half of the hollow round ball is positioned outside the base, and the hollow round ball positioned outside the base forms a hemispherical bulge;
the deformation layer is made of magnetostrictive materials and covers the hemispherical bulges;
the tube body is connected to the top surface of the base and is vertical to the top surface of the base, the tube body is communicated with the cavity in the base, one end of the tube body, which is far away from the base, is sealed, a convex tube is fixedly arranged on the side wall of the tube body, and the convex tube is communicated with the tube body;
the pinhole camera is arranged at the pipe orifice of the convex pipe and used for plugging the convex pipe, and faces the deformation layer;
the hollow round balls, the convex pipes, the pipe body and the cavity of the base are all provided with phase-change gel.
Furthermore, in order to better realize the invention, the number of the tube bodies is three, the three tube bodies are uniformly distributed around the hemispherical bulge, each tube body is connected with one convex tube, and each convex tube is internally provided with one pinhole camera.
Furthermore, in order to better realize the invention, the solar energy collecting device further comprises a sunshade ceiling, and one ends of the three pipe bodies, which are deviated from the base, are connected with the sunshade ceiling.
Further, in order to better implement the present invention, the tube body, the convex tube, the sunroof, the base and the hollow sphere are all structural members made of aluminum or wood.
Further, in order to better implement the invention, a film surrounding the hemispherical protrusions is also adhered to the top surface of the base.
Further, in order to better implement the invention, the color of the film is black.
Furthermore, in order to better realize the invention, a normally closed microswitch is embedded in the wall body of the hemispherical protrusion, a first installation chamber and a second installation chamber are arranged in the cavity of the base, the first installation chamber and the second installation chamber are respectively arranged at two sides of the round hole, a lithium battery is arranged in the first installation chamber, an alarm module is arranged in the second installation chamber, and the alarm module is in communication connection with a police system;
the micro switch, the lithium battery and the alarm module are electrically connected through wires to form a loop;
when the deformation layer is sleeved on the hemispherical bulge, the deformation layer presses the microswitch to close the microswitch, and the loop is disconnected;
when the deformation layer is taken down from the hemispherical bulge, the micro switch is opened, the loop is closed, and the alarm module sends an alarm signal to the police system.
Furthermore, in order to better realize the invention, the bottom surface of the base can be also detachably and fixedly connected with a box body, and a balancing weight is arranged in the box body.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an electromagnetic field measuring device of an outdoor power transmission line, which comprises a base, a hollow ball, a deformation layer, a pipe body and a pinhole camera, wherein the base is hollowed to form a cavity, a round hole communicated with the cavity is formed in the center of the top surface of the base, the hollow ball is fixedly bonded in the round hole through glue, one half of the hollow ball is positioned outside the base, the hollow ball positioned outside the base forms a hemispherical bulge, the deformation layer is made of magnetostrictive material, the deformation layer covers the hemispherical bulge, the pipe body is connected to the top surface of the base and is vertical to the top surface of the base, the pipe body is communicated with the cavity in the base, one end of the pipe body, which is far away from the base, is sealed, a convex pipe is fixedly arranged on the side wall of the pipe body and is communicated with the pipe body, the pinhole camera is arranged at the pipe orifice of the convex pipe and seals the convex pipe, the pinhole camera faces the deformation layer and is in communication connection with a terminal computer, and image processing software is installed in the terminal computer.
The electromagnetic field measuring device provided by the invention is arranged at a position near an outdoor power transmission line, an electromagnetic field generated when the outdoor power transmission line transmits current acts on the deformation layer, and the deformation layer is made of magnetostrictive materials, so that when a magnetic field acts on the deformation layer, the deformation layer deforms, and a pinhole camera shoots a picture of the deformation layer. When the device is not placed in an electromagnetic field, the deformation layer does not deform, and at the moment, a picture of the deformation layer shot by the pinhole camera is an initial image; after the device is placed in an electromagnetic field, the deformation layer deforms, a picture of the deformation layer shot by the pinhole camera is a target image, and the target image is different from the initial image due to the deformation of the deformation layer. The terminal computer analyzes and processes the target image by means of an image processing technology, analyzes a difference value of the target image compared with the initial image, and calculates the size of the magnetic field at the position of the device according to the difference value. Therefore, the electromagnetic field measuring device measures the strength of the electromagnetic field at a certain position around the outdoor power transmission line by means of the characteristics of the magnetostrictive material and the image processing technology, and micro-current cannot be generated in the measuring process, so that the electromagnetic field generated by the power transmission line cannot be influenced, and the result of the electromagnetic field of the power transmission line measured by the device is more accurate and reliable.
All be provided with the phase transition gel in the cavity of above-mentioned hollow ball, bulge tube, body and base, this phase transition gel absorbs the heat and produces the phase transition to external refrigeration, then can reduce hollow ball, bulge tube, body and base effectively like this and produce micro deformation because of expend with heat and contract with cold, and the heat of the shape change layer of attached on the hemisphere arch of hollow ball also will be transmitted to the phase transition gel in the hollow ball, so the shape change layer is almost zero because of the deformation that expend with heat and contract with cold produced, thereby further improve the precision of the electromagnetic field result that the device measured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an electromagnetic field measuring device for an outdoor power transmission line provided by an embodiment of the invention;
FIG. 2 is a cross-sectional view of an electromagnetic field measuring device for an outdoor power transmission line provided by an embodiment of the invention;
FIG. 3 is a partially enlarged view of the area A in FIG. 2;
FIG. 4 is a schematic diagram of deformation of a deformable layer in an embodiment of the invention (in the figure, the hollow arrows point to the magnetic field direction);
fig. 5 is a schematic structural view of a patch in an embodiment of the present invention.
In the figure:
1-a base; 2-hollow round balls; 3-a deformation layer; 4-a pipe body; 5-a convex pipe; 6-pinhole camera; 7-phase change gel; 8-sunshade ceiling; 9-sticking a film; 10-a microswitch; 11-a lithium battery; 12-an alarm module; 13-a box body; 14-counterweight block.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Example 1:
the invention provides an electromagnetic field measuring device for an outdoor power transmission line, which comprises a base 1, a hollow sphere 2, a deformation layer 3, a tube body 4 and a pinhole camera 6, wherein:
as shown in fig. 1 and 2, a cavity is hollowed in the base 1, a circular hole communicated with the cavity is formed in the center of the top surface of the base 1, the diameter of the hollow sphere 2 is adapted to the aperture of the circular hole, the hollow sphere 2 is fixed in the circular hole by bonding with glue, and at this time, the circular hole is blocked by the hollow sphere 2, so that the cavity of the base 1 is a closed cavity. Half of the hollow sphere 2 is positioned outside the base 1, and the hollow sphere 2 positioned outside the base 1 forms a hemispherical bulge.
The deformation layer 3 is made of a magnetostrictive material, and the magnetostrictive material in this embodiment may be a rare earth magnetostrictive material or a giant magnetostrictive material, which is magnetized in a magnetic field and instantaneously deforms in the direction of the magnetic field. The deformation layer 3 covers the hemispherical protrusions. Specifically, the deformation layer 3 is a hemispherical shell structure made of magnetostrictive material, and the hemispherical shell structure is sleeved on the hemispherical protrusion. As shown in fig. 4, the magnetic field generated by the power transmission line penetrates into the hemispherical shell structure from one side of the deformation layer 3 and penetrates out of the hemispherical shell structure from the other side of the deformation layer 3. The penetrating magnetic field actually drives the corresponding position of the deformation layer 3 to generate concave deformation towards the inside of the hemispherical shell structure, but the concave deformation cannot be displayed because the hemispherical bulge is supported at the inner side of the deformation layer 3. The penetrating magnetic field drives the corresponding position of the deformation layer 3 to generate outward convex deformation towards the hemispherical shell structure, namely the position of the deformation layer 3 protrudes outwards.
Above-mentioned body 4 is connected on the top surface of above-mentioned base 1 to this body 4 is perpendicular with above-mentioned base 1's top surface, cavity intercommunication in this body 4 and above-mentioned base 1, body 4 deviates from base 1's one end and seals, a stand pipe 5 has set firmly on the lateral wall of body 4, this stand pipe 5 and above-mentioned body 4 intercommunication, pinhole camera 6 is installed in the mouth of pipe department of above-mentioned stand pipe 5 and is sealed above-mentioned stand pipe 5, this pinhole camera 6 is towards above-mentioned deformation layer 3, and this pinhole camera 6 is connected with terminal computer communication, install image processing software in the terminal computer. Specifically, the pinhole camera 6 is internally provided with a storage battery and a signal emitter, an image shot by the pinhole camera is sent to a computer terminal through the signal emitter, and image processing software in the computer terminal processes a related image.
The electromagnetic field measuring device provided by the invention is arranged at a certain position near an outdoor power transmission line, an electromagnetic field generated when the outdoor power transmission line transmits current acts on the deformation layer 3, and the deformation layer 3 is made of magnetostrictive materials, so that when a magnetic field acts on the deformation layer 3, the deformation layer 3 deforms, the pinhole camera 6 shoots a picture of the deformation layer 3, and the shot picture is sent to the computer terminal. Of course, the pinhole camera 6 may also take a real-time image of the deformation layer 3, and send the image to a computer terminal, and the computer terminal performs screenshot processing.
When the device is not placed in an electromagnetic field, the deformation layer 3 does not deform, and at the moment, a picture of the deformation layer 3 shot by the pinhole camera 6 is an initial image; after the device is placed in an electromagnetic field, the deformation layer 3 deforms, a picture of the deformation layer 3 shot by the pinhole camera 6 is a target image, and the target image is different from the initial image due to the deformation of the deformation layer 3. The terminal computer analyzes and processes the target image by means of an image processing technology, analyzes a difference value of the target image compared with the initial image, and calculates the size of the magnetic field at the position of the device according to the difference value. Therefore, the electromagnetic field measuring device measures the strength of the electromagnetic field at a certain position around the outdoor power transmission line by means of the characteristics of the magnetostrictive material and the image processing technology, and micro-current cannot be generated in the measuring process, so that the electromagnetic field generated by the power transmission line cannot be influenced, and the result of the electromagnetic field of the power transmission line measured by the device is more accurate and reliable. Since the image processing technology is already a very common technical means in the current science and technology, it is not described in detail here. In addition, the magnetic field at the position of the material is calculated by the deformation amount of the magnetostrictive material, and this algorithm is disclosed in the related papers/books as the prior art, so it is not described in detail here.
Of course, the device can also be used for measuring the electromagnetic field change condition of the outdoor power transmission line, when the electromagnetic field changes, the electromagnetic field intensity at the same position is different, and the electromagnetic field intensity acting on the deformation layer 3 at the position is different, so that the deformation amount generated by the deformation layer 3 is different.
All be provided with phase transition gel 7 in the cavity of above-mentioned hollow ball 2, protruding pipe 5, body 4 and base 1, this phase transition gel 7 absorbs the heat and produces the phase transition to external refrigeration, then can reduce hollow ball 2 effectively like this, protruding pipe 5, body 4 and base 1 and produce micro deformation because of expend with heat and contract with cold, and the heat of attaching to the protruding deformation layer 3 of hemisphere of hollow ball 2 also will transmit to the phase transition gel 7 in hollow ball 2 in, so deformation layer 3 is nearly zero because of expend with heat and contract with cold the deformation that produces, thereby further improve the device and measure the precision of the transmission line electromagnetic field result that obtains. Of course, the phase change gel 7 may be replaced by clean water or oil, as long as it can exchange heat with the hollow sphere 2, the protruding tube 5, the tube body 4, the base 1, and the deformation layer 3, thereby reducing the influence of the spatial environment temperature on the hollow sphere 2, the protruding tube 5, the tube body 4, the base 1, and the deformation layer 3.
Preferably, the phase transition temperature of the phase transition gel in the hollow ball 2 is higher than that of the phase transition gel in the base 1, so that when the temperature rises, the phase transition gel in the hollow ball 2 will be prior to the phase transition gel in the base 1, so that the temperature of the deformation layer 3 is less likely to rise, and after the phase transition gel in the hollow ball 2 absorbs the phase transition to start, the temperature of the phase transition gel in the hollow ball 2 rises, and the hollow ball 2 contacts with the phase transition gel in the base 1, so that the phase transition gel in the base 1 can also play a certain cooling effect on the hollow ball 2 and the phase transition gel therein, and the temperature of the deformation layer 3 on the surface of the hollow ball 2 is less likely to rise.
Optionally, the number of the tube bodies 4 is three, the three tube bodies 4 are uniformly distributed around the hemisphere, each tube body 4 is connected with one of the protruding tubes 5, and each protruding tube 5 is internally provided with one of the pinhole cameras 6. Like this, three pinhole camera 6 encircles above-mentioned deformation layer 3 evenly distributed to three pinhole camera 6 is from three different directions towards above-mentioned deformation layer 3, thereby takes different photos from different position, then handles together in computer terminal, finally obtains the pattern that is closer to with deformation layer 3 actual conditions, so that finally obtain more accurate measuring result. Of course, it is also possible to mount one tube 4 on the top surface of the base 1, in which case only one pinhole camera 6 takes an image of the deformable layer 3.
Example 2:
as an improved implementation manner of embodiment 1, the outdoor transmission line electromagnetic field measuring device provided in this embodiment is mostly the same as but partially different from the outdoor transmission line electromagnetic field measuring device provided in embodiment 1, and the difference is that:
as shown in fig. 1 and fig. 2, the electromagnetic field measuring device for an outdoor power transmission line provided in this embodiment further includes a sunroof 8, and ends of the three pipe bodies 4 departing from the base 1 are all connected to the sunroof 8. Specifically, the sunroof 8 is a conical shell structure, and one end of the tube 4 away from the base 1 is bolted and fixed to the sunroof 8. When the number of the pipe bodies 4 is one, the sunroof 8 is fastened to the pipe body 4.
Since the electromagnetic field measuring device for outdoor power transmission lines is used in the open air in most cases, and the deformation layer 3 is located on the top surface of the base 1, sunlight will be directly irradiated to the deformation layer 3 if the sunroof 8 is not provided. With the aid of the sunroof 8, the deformation layer 3 can be shielded from sunlight and the deformation layer 3 can be shielded from rain water.
Optionally, the tube 4, the convex tube 5, the sunroof 8, the base 1, and the hollow sphere 2 in this embodiment are all structural members made of aluminum or wood. Because aluminum and wood are non-ferromagnetic materials, and have light weight, strong plasticity and high hardness, the pinhole camera 6 and the deformation layer 3 can be stably supported, and more importantly, a magnetic field can smoothly penetrate through the aluminum and the wood to reach the deformation layer 3. Of course, the tube 4, the convex tube 5, the sunshade ceiling 8, the base 1 and the hollow sphere 2 may also be structural members made of hard plastics.
Example 3:
as an improved implementation manner of example 1, the outdoor transmission line electromagnetic field measuring device provided in this embodiment is mostly the same as but a little different from the outdoor transmission line electromagnetic field measuring device provided in example 1, and the difference is that:
as shown in fig. 5, a sticker 9 is adhered to the top surface of the base 1, the sticker 9 is black, and the sticker 9 surrounds the hemispherical protrusion. Since the pinhole camera 6 photographs the image of the deformable layer 3 not only photographs the deformable layer 3 but also photographs the top surface of the base 1, and the deformable layer 3 is usually not black, the image of the deformable layer 3 photographed by the pinhole camera 6 can be more easily distinguished from the top surface of the base 1 by virtue of the film, and the film is black, so that the amount of deformation of the deformable layer 3 can be more easily recognized. The sticking film 9 completely covers the top surface of the base 1, and the sticking film 9 is provided with a yielding hole corresponding to the deformation layer 3 and the pipe body 4.
Of course, the film 9 may not be attached to the top surface of the base 1.
Example 4:
the present embodiment is further improved on the technical solutions provided in embodiments 1, 2 and 3, and the technical solutions provided in the present embodiment are substantially the same as and slightly different from the technical solutions provided in embodiments 1, 2 and 3, and the differences are that:
as shown in fig. 2 and 3, a normally closed microswitch 10 is also embedded in the wall of the hemispherical protrusion. A first installation chamber and a second installation chamber are arranged in the cavity of the base 1, the first installation chamber and the second installation chamber are respectively arranged on two sides of the round hole, a lithium battery 11 is arranged in the first installation chamber, an alarm module 12 is arranged in the second installation chamber, and the alarm module 12 is in communication connection with a police system. The micro switch 10, the lithium battery 11 and the alarm module 12 are electrically connected through wires to form a loop. When the deformation layer 3 is sleeved on the hemispherical bulge, the deformation layer 3 presses the microswitch 10 under the action of gravity to close the microswitch 10, the loop is disconnected, and the alarm module 12 cannot send an alarm signal to a police system; when the deformation layer 3 is taken down from the hemispherical bulge, the microswitch 10 is switched off, the loop is closed, and the alarm module 12 sends an alarm signal to a police system.
Thus, after the deformation layer 3 is taken down from the hemispherical bulge, the alarm module 12 sends an alarm signal to a police system, thereby achieving a certain anti-theft effect. Because the device is placed and is used in the field, and the deformation layer 3 on the device is not fixedly connected with other parts, so the deformation layer 3 is easily taken down from the hemispherical bulge, and the alarm module 12 can give an alarm to a police system in time after the deformation layer 3 is taken down so that the police system can give an alarm in time to find the deformation layer 3. Of course, under the action of the magnetic field, the section corresponding to the microswitch 10 may also protrude outwards to release the microswitch 10, and the alarm module 12 will also give an alarm to the police system to form a false alarm, but the probability of the false alarm is very low, and the cost and the energy consumption caused by the few times of occurrence are far less than the consequences caused by the loss of the deformable layer 3.
Of course, the microswitch 10, the lithium battery 11 and the alarm module 12 may not be installed.
Example 5:
the present embodiment is further improved on the technical solutions provided in embodiments 1, 2, and 3, and the technical solutions provided in the present embodiment are substantially the same as and slightly different from the technical solutions provided in embodiments 1, 2, and 3, except that:
a box body 13 is detachably and fixedly connected to the bottom surface of the base 1, and a balancing weight 14 is installed in the box body 13. The box body 13 is connected to the bottom surface of the base 1 by bolting or clamping, and the counterweight 14 may be a concrete block or a stone block.
When specifically using the outdoor transmission line electromagnetic field measuring device that this embodiment provided, place the device on the ground of outdoor transmission line below, above-mentioned box 13 then directly meets with ground, with the help of balancing weight 14, then can make whole device place more firmly subaerial.
Of course, a pit may be formed in the ground, the casing 13 may be buried in the pit, and the base 1 and the deformation layer 3 formed thereon may be exposed from the ground.
Of course, universal wheels may be mounted on the bottom end of the box 13 to allow the operator to move the device to a desired position for measurement.
Further, the operator may remove the base 1 from the case 13 and then carry the device, which does not include the case 13 and the weight 14, to move the position to measure the position.
It should be noted that the electromagnetic field measuring device for the outdoor power transmission line provided by this embodiment is mainly used to be fixed at a certain outdoor position to measure the magnetic field strength or the change of the magnetic field strength at a certain peripheral position of the outdoor power transmission line.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. An outdoor transmission line electromagnetic field measuring device, characterized by, includes:
the inner part of the base is hollowed to form a cavity, and a round hole communicated with the cavity is formed in the center of the top surface of the base;
the hollow round ball is fixedly adhered in the round hole through glue, one half of the hollow round ball is positioned outside the base, and the hollow round ball positioned outside the base forms a hemispherical bulge;
the deformation layer is made of magnetostrictive materials and covers the hemispherical bulges;
the tube body is connected to the top surface of the base and is vertical to the top surface of the base, the tube body is communicated with the cavity in the base, one end of the tube body, which is far away from the base, is sealed, a convex tube is fixedly arranged on the side wall of the tube body, and the convex tube is communicated with the tube body;
the pinhole camera is arranged at the pipe orifice of the convex pipe and used for plugging the convex pipe, and faces the deformation layer;
phase change gel is arranged in the hollow round ball, the convex pipe, the pipe body and the cavity of the base;
when the device is not placed in the electromagnetic field, the deformation layer does not deform, and at the moment, a picture of the deformation layer shot by the pinhole camera is an initial image; after the device is placed in an electromagnetic field, the deformation layer deforms, a picture of the deformation layer shot by the pinhole camera is a target image, the target image is different from the initial image due to the deformation of the deformation layer, a difference value of the target image compared with the initial image is analyzed, and the size of the magnetic field at the position of the device is calculated according to the difference value.
2. The outdoor transmission line electromagnetic field measuring device of claim 1, characterized in that: the quantity of body is three, three the body encircles protruding evenly distributed of hemisphere, every all be connected with one on the body the bulge, every all install one in the bulge pinhole camera.
3. The outdoor power transmission line electromagnetic field measuring device of claim 2, characterized in that: the three pipe bodies are connected with the sunshade ceiling at the ends departing from the base.
4. The outdoor power transmission line electromagnetic field measuring device of claim 3, characterized in that: the pipe body, the convex pipe, the sunshade ceiling, the base and the hollow round ball are all structural members made of aluminum or wood.
5. The outdoor power transmission line electromagnetic field measuring device of claim 1, characterized in that: and the top surface of the base is also bonded with a pad pasting surrounding the hemispherical bulge.
6. The outdoor transmission line electromagnetic field measuring device of claim 5, characterized in that: the adhesive film is black in color.
7. The outdoor transmission line electromagnetic field measuring device of any one of claims 1-6, characterized in that: a normally closed microswitch is embedded in the wall body of the hemispherical protrusion, a first installation chamber and a second installation chamber are arranged in the cavity of the base, the first installation chamber and the second installation chamber are respectively arranged at two sides of the round hole, a lithium battery is installed in the first installation chamber, an alarm module is installed in the second installation chamber, and the alarm module is in communication connection with a police system;
the micro switch, the lithium battery and the alarm module are electrically connected through wires to form a loop;
when the deformation layer is sleeved on the hemispherical bulge, the deformation layer presses the microswitch to close the microswitch, and the loop is disconnected;
when the deformation layer is taken down from the hemispherical bulge, the micro switch is opened, the loop is closed, and the alarm module sends an alarm signal to the police system.
8. An outdoor transmission line electromagnetic field measuring device according to any one of claims 1-6, characterized in that: the bottom surface of the base is also detachably and fixedly connected with a box body, and a balancing weight is installed in the box body.
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