Electromagnetic field detection device of Internet of Things sensor

Abstract

The utility model relates to the field of electromagnetic field detection, in particular to an electromagnetic field detection device of an internet of things sensor, which comprises a shell, a circuit board, a shielding cover, a detection probe, a signal processing module and a signal transmission module. The detection probe can collect electromagnetic field signals in the environment where the detection probe is located and send the collected signals to the signal processing module, and the signal processing module sends the processed signals to the signal transmission module and sends the processed signals to the cloud server. According to the utility model, the internal circuit board is isolated from the external electromagnetic field environment through the shielding cover, so that the influence of the electromagnetic field in the external environment on the internal circuit is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electromagnetic field detection especially a kind of electromagnetic field detection device of internet of things sensor. BACKGROUND

[0002] Electromagnetic field detection device is used to detect the important equipment of electromagnetic field intensity in environment, with the progress of science and technology, electromagnetic field detection device plays an important role in a variety of scenes, while the influence of electromagnetic field field on human health is gradually valued, especially in such as communication base station, substation and so on occasion needs real-time monitoring magnetic field intensity in environment.

[0003] At present, the Chinese utility model patent application with publication number CN 218350383 U and publication date January 20, 2023 proposes a kind of electromagnetic field field range detection device, comprising: remote control car, detection probe installed on the top of remote control car and movable sleeve installed on remote control car to drive detection probe to rotate.

[0004] When using, remote control car drives detection probe to move, realizes the mobile detection in electromagnetic field field range.

[0005] For the above related technology, since detection device is in electromagnetic field range for a long time, electromagnetic in electromagnetic field can interfere with the circuit part of detection device and detection probe at any time, not only can cause interference to the signal transmission of detection device, but also can cause internal circuit overload, and then cause equipment to work normally. UTILITY MODEL CONTENT

[0006] In order to reduce the adverse effects of electromagnetic interference on electromagnetic field detection device, the utility model provides a kind of electromagnetic field detection device of internet of things sensor.

[0007] The utility model provides a kind of electromagnetic field detection device of internet of things sensor, adopt following technical scheme:

[0008] A kind of electromagnetic field detection device of internet of things sensor, including shell, for protection and support;Circuit board, fixedly installed in the shell interior, for carrying control circuit;Shielding cover, fixedly arranged in the shell interior, and cover is arranged on the outer side of the circuit board, for shielding electromagnetic interference;Detection probe, fixedly installed on the shell, and electrically connected on the circuit board by passing through the shielding cover;Signal processing module, fixedly installed on the circuit board, is electrically connected with the detection probe, for processing detection signal;Signal transmission module, fixedly installed on the circuit board, is electrically connected with the signal processing module, for transmitting detection data with cloud server.

[0009] By adopting the technical scheme, the electromagnetic field detection device of the Internet of Things sensor detects the electromagnetic field in the field domain of the electromagnetic field of the convertible bond, and sends the detected data to the signal processing module. The signal processing module sends the processed signal to the signal transmission module. The signal transmission module sends the processed signal to the cloud server for user reference. When the electromagnetic field detection device is in the electromagnetic field domain, only the detection probe and the shell are exposed to the electromagnetic field environment. The shielding cover covers the circuit board, the signal processing module, the signal transmission module and the circuit inside. Thus, when the Internet of Things sensor is placed in the electromagnetic field domain for long-term work, the electromagnetic interference is isolated outside the circuit board, reducing the influence of electromagnetic interference on the circuit part of the electromagnetic field detection device, thereby reducing the probability of failure of the electromagnetic field detection device and improving the reliability of the electromagnetic field detection device of the Internet of Things sensor.

[0010] Optionally, the signal processing module includes a microprocessor fixedly installed on the circuit board and arranged on the inner side of the shielding cover, for analyzing and processing the detection signal; a filter having an input end electrically connected with the detection probe and an output end electrically connected with the microprocessor, for filtering noise; and the microprocessor is further electrically connected with the signal transmission module.

[0011] When the detection probe collects the electromagnetic field data around the environment, the electromagnetic signals such as satellite broadcast and modulated radio station interference signals in the environment will be collected. By adopting the above technical scheme, the detection probe sends the collected data to the filter. By adjusting the values of the capacitance and inductance in the filter, the filter only retains the useful signals related to the electric field intensity. Then, the signals related to the electric field intensity are sent to the microprocessor for processing and calculation to obtain the electromagnetic field intensity in the surrounding environment. Thus, by setting the filter, the interference signals unrelated to the electromagnetic field intensity can be filtered out, and the accuracy of the electromagnetic field intensity detection is improved.

[0012] Optionally, the signal processing module further includes a first operational amplifier having an input end connected with the output end of the filter and an output end electrically connected with the microprocessor.

[0013] By adopting the above technical scheme, after the filter filters the signal, the first operational amplifier amplifies the filtered signal. The first operational amplifier amplifies the electromagnetic field intensity signal and the noise signal in the signal at the same time, so as to better filter the noise during subsequent data processing, make the electromagnetic field intensity signal clearer, and enhance the electromagnetic field intensity signal, thereby improving the accuracy of the electromagnetic field intensity detection.

[0014] Optionally, the signal transmission module comprises a gain antenna installed on the shell and connected to the circuit board through the shielding cover; and a second operational amplifier, an input end of which is electrically connected to the microprocessor and an output end of which is connected to the gain antenna.

[0015] By adopting the above technical solution, the microprocessor sends the processed signal to the second operational amplifier, and the second operational amplifier amplifies the signal and then sends it through the gain antenna, realizing remote communication with the cloud server. By setting the second operational amplifier, the transmitted signal can be enhanced, reducing the influence of noise signals in the electromagnetic field environment on the transmitted data. The setting of the gain antenna can enhance and amplify the strength of the wireless signal, so that the communication signal can be transmitted in a strong electromagnetic field, improving the communication effect.

[0016] Optionally, the shell is provided with a receiving groove, and the gain antenna is rotatably installed in the receiving groove.

[0017] By adopting the above technical solution, rotating the gain antenna can fold and store the gain antenna in the receiving groove, so that the gain antenna can be stored during transportation and placement, reducing the probability of damaging the gain antenna when colliding.

[0018] Optionally, the shielding cover and the shell are correspondingly provided with ventilation holes.

[0019] By adopting the above technical solution, the setting of the ventilation holes enables the circuit board inside the shell to exchange air and temperature with the external environment, timely cooling the circuit inside the shell, reducing the influence of high-temperature environment on the electromagnetic field detection device of the Internet of Things sensor.

[0020] Optionally, the shell is made of metal material, and the shell is provided with a grounding point.

[0021] By adopting the above technical solution, the shell made of metal material not only provides more effective protection, but also plays the role of static shielding and low-frequency magnetic shielding, reducing the influence of external interference electric field on the internal circuit. Grounding the metal shell can guide the external high-frequency interference signal into the ground through the metal shell, further reducing the interference of the external electromagnetic field on the internal circuit.

[0022] Optionally, the shielding cover is made of low-resistance material with good conductivity, and the shielding cover and the shell are conductive.

[0023] By adopting the technical scheme, the shielding cover made of low-resistance materials with good electric conductivity, such as copper, aluminum, silver and the like, can generate eddy current in the shielding cover when the electromagnetic field detection device of the Internet of Things sensor is in a high-frequency interference magnetic field, so that the energy of the interference magnetic field is consumed, and then the influence of the high-frequency electromagnetic field on the internal circuit is reduced.

[0024] In summary, the utility model has at least one of the following beneficial technical effects:

[0025] By setting the shielding cover on the electromagnetic field detection device of the Internet of Things sensor, the circuit and components on the circuit board are isolated from the external electromagnetic field environment, and then when the electromagnetic field detection device of the Internet of Things sensor is placed in the electromagnetic field domain for long-term work, the influence of the electromagnetic interference in the environment on the circuit part of the electromagnetic field detection device is reduced, and then the probability of failure of the electromagnetic field detection device is reduced.

[0026] Since the magnetic field distribution in the electromagnetic field environment is relatively complex, a large amount of interference signals will be collected when the electromagnetic field strength of the current position is detected, the collected signals are denoised and amplified by setting the filter and the operational amplifier, the signal of the electromagnetic field strength is clearer, and the accuracy of the electromagnetic field strength detection is improved.

[0027] 3. The double shielding structure of the metal shell and the shielding cover reduces the influence of the high-frequency interference magnetic field and the low-frequency magnetic field on the internal circuit, achieves the effect of double shielding, and then the internal circuit plays a protection role. BRIEF DESCRIPTION OF DRAWINGS

[0028] Fig. 1 is the overall structure schematic diagram of the embodiment of the utility model;

[0029] Fig. 2 is the overall structure explosion schematic diagram of the embodiment of the utility model.

[0030] Mark explanation: 1, shell; 11, storage groove; 12, grounding point; 13, ventilation hole; 2, circuit board; 3, shielding cover; 4, detection probe; 5, signal processing module; 51, microprocessor; 52, filter; 53, first operational amplifier; 6, signal transmission module; 61, gain antenna; 62, second operational amplifier. DETAILED DESCRIPTION

[0031] The utility model is further explained in detail as follows: Figs. 1-2 The utility model is further explained in detail as follows:

[0032] The embodiment of the utility model discloses an electromagnetic field detection device of Internet of Things sensor. Figs. 1-2The electromagnetic field detection device of the Internet of Things sensor mainly comprises a shell 1, a circuit board 2, a shielding cover 3, a detection probe 4, a signal processing module 5 and a signal transmission module 6. When in use, the electromagnetic field detection device of the Internet of Things sensor is installed in an environment where the electromagnetic field needs to be detected. The detection probe 4 can collect the electromagnetic field signals in the environment and send the collected signals to the signal processing module 5. The signal processing module 5 sends the processed signals to the signal transmission module 6 and to the cloud server. When the detection probe 4 collects the electromagnetic field signals in the environment, the shell 1 and the shielding cover 3 isolate the internal circuit board 2 from the external electromagnetic field environment, reducing the influence of the external electromagnetic field on the internal circuit.

[0033] With reference to Fig. 1 and 2 The shell 1 comprises an upper shell and a lower shell, both of which are made of stainless steel. The upper shell and the lower shell are connected by screws. The outer wall of the upper shell is provided with a grounding point 12 made of metal. The grounding point 12 is connected to the ground by a wire, so that the metal shell 1 is grounded. The inside of the lower shell is provided with a threaded column. The circuit board 2 is fixed on the threaded column by screws to fix the circuit board 2. The sidewall of the lower shell is provided with a receiving groove 11, which is a rectangular groove opened on the sidewall of the lower shell. The end face of the lower shell opposite to the end face provided with the grounding point 12 of the upper shell is provided with a ventilation hole 13. The inside of the ventilation hole 13 is provided with a filter screen for dust prevention.

[0034] With reference to Fig. 1 and Fig. 2 The inside of the shell 1 is provided with a layer of shielding cover 3 made of aluminum foil. The shielding cover 3 is attached to the inner surfaces of the upper shell and the lower shell respectively. The shielding cover 3 attached to the lower shell is provided with a ventilation hole 13 corresponding to the ventilation hole 13.

[0035] When shielding and isolating the external electromagnetic field, the metal shell 1 can play the role of electrostatic shielding and low-frequency magnetic shielding, reducing the influence of external interference electric field on the internal circuit. The shielding cover 3 made of aluminum foil can generate eddy current in the shielding cover 3 when the electromagnetic field detection device of the Internet of Things sensor is in a high-frequency interference magnetic field, consume the energy of the interference magnetic field and reduce the influence of the high-frequency electromagnetic field on the internal circuit.

[0036] With reference to Fig. 1 and Fig. 2The detection probe 4 adopts a Hall sensor or a MEMS electric field sensor to detect the intensity of the surrounding electric field. The Hall sensor converts the magnetic field intensity into a corresponding proportional change in voltage according to the Hall effect, and converts the analog voltage into a digital signal through an ADC (analog-to-digital conversion) function. The MEMS electric field sensor detects the force in the electric field by using a micro spring and a grid-shaped silicon structure, and measures the displacement by an optical principle to calculate the electric field intensity. The detection probe 4 is fixedly installed on the side of the lower shell away from the ground and is connected to the circuit board 2 through a wire.

[0037] With reference to Fig. 2 The circuit board 2 is fixedly installed on the screw of the lower shell by a screw. The circuit board 2 is provided with a signal processing module 5 and a signal transmission module 6. The signal processing module 5 includes a microprocessor 51, a filter 52, and a first operational amplifier 53. The signal input end of the filter 52 is connected to the detection probe 4. The output end of the filter 52 is connected to the input end of the first operational amplifier 53. The output end of the first operational amplifier 53 is connected to the microprocessor 51. The detection probe 4 sends the collected data to the filter 52. The values of the capacitance and inductance in the filter 52 are adjusted to make the filter 52 retain only the useful signals related to the electric field intensity. After the filter 52 filters the signals, the first operational amplifier 53 amplifies the filtered signals. The first operational amplifier 53 amplifies the electromagnetic field intensity signals and noise signals in the signals at the same time. The amplified signals are sent to the microprocessor 51. The microprocessor 51 processes and calculates the signals of the electric field intensity to obtain the electromagnetic field intensity in the surrounding environment. The signal transmission module 6 includes a gain antenna 61 and a second operational amplifier 62. The microprocessor 51 sends the electric field intensity information to the second operational amplifier 62. The second operational amplifier 62 sends the developed signals through the gain antenna 61 and remotely communicates with a cloud server. The microprocessor 51, the filter 52, the first operational amplifier 53, and the second operational amplifier 62 are fixedly arranged on the circuit board 2. The receiving slot 11 is provided with a rotating connecting piece. The gain antenna 61 is rotatably arranged in the receiving slot 11 and is electrically connected to the second operational amplifier 62. The rotating connecting piece can adopt a bearing and a riveting structure.

[0038] The implementation principle of the electromagnetic field detection device of the Internet of Things sensor is as follows: after the electromagnetic field detection device of the Internet of Things sensor is placed in an environment where electromagnetic field needs to be detected, the detection probe 4 sends the collected signal to the filter 52, the filter 52 sends the filtered signal to the first operational amplifier 53, the first operational amplifier 53 sends the amplified signal to the microprocessor 51, the microprocessor 51 obtains the electric field intensity of the environment after processing the signal, then the microprocessor 51 sends the electric field intensity signal to the second operational amplifier 62, the second operational amplifier 62 sends the amplified signal to the cloud server through the gain antenna 61; when the detection probe 4 collects data of the surrounding electromagnetic field environment, the metal shell and the shielding cover 3 isolate the internal circuit from the external electromagnetic field environment, reducing the interference of the external electromagnetic field on the internal circuit.

[0039] In conclusion, the shielding cover 3 is arranged to isolate the internal circuit from the external environment, which can reduce the influence of the external electromagnetic field on the internal circuit and reduce the probability of damage of the internal circuit caused by the external electromagnetic field when the electromagnetic field detection device of the Internet of Things sensor is placed in the electromagnetic field environment for a long time; the double shielding structure of the metal shell and the shielding cover 3 can reduce the influence of the high-frequency interference magnetic field and the low-frequency magnetic field on the internal circuit, achieve the effect of double shielding, and further play a better protection role on the internal circuit; the first operational amplifier 53 and the filter 52 are arranged in the internal circuit to process the collected signal, so that the detected electromagnetic field intensity signal is clearer, and the accuracy of the electromagnetic field intensity detection is improved.

[0040] The above are preferred embodiments of the utility model, and the protection scope of the utility model is not limited by this, so: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. An electromagnetic field detection apparatus for an Internet of Things sensor, characterized by: Comprising a shell (1) for protection and support; a circuit board (2) fixedly installed inside the shell (1) for carrying control circuits; a shield cover (3) fixedly arranged inside the shell (1) and covering the outside of the circuit board (2) for shielding electromagnetic interference; a detection probe (4) fixedly installed on the shell (1) and electrically connected to the circuit board (2) through the shield cover (3); a signal processing module (5) fixedly installed on the circuit board (2) and electrically connected to the detection probe (4) for processing detection signals; a signal transmission module (6) fixedly installed on the circuit board (2) and electrically connected to the signal processing module (5) for transmitting detection data to a cloud server.

2. The electromagnetic field detection device of an Internet of Things sensor according to claim 1, characterized in that: The signal processing module (5) comprises a microprocessor (51) fixedly installed on the circuit board (2) and arranged inside the shield cover (3) for analyzing and processing detection signals; a filter (52) having an input end electrically connected to the detection probe (4) and an output end electrically connected to the microprocessor (51) for filtering noise; The microprocessor (51) is also electrically connected to the signal transmission module (6).

3. The electromagnetic field detection device of claim 2, wherein: The signal processing module (5) further comprises a first operational amplifier (53) having an input end connected to the output end of the filter (52) and an output end electrically connected to the microprocessor (51).

4. The electromagnetic field detection device of claim 2, wherein: The signal transmission module (6) comprises a gain antenna (61) installed on the shell (1) and connected to the circuit board (2) through the shield cover (3); a second operational amplifier (62) having an input end electrically connected to the microprocessor (51) and an output end connected to the gain antenna (61).

5. The electromagnetic field detection device of claim 4, wherein: The shell (1) is provided with a receiving groove (11), and the gain antenna (61) is rotatably installed in the receiving groove (11).

6. The electromagnetic field detection apparatus of an Internet of Things sensor according to any one of claims 1-4, characterized in that: The shield cover (3) and the shell (1) are correspondingly provided with ventilation holes (13).

7. The electromagnetic field detection apparatus of an Internet of Things sensor according to any one of claims 1-4, characterized in that: The shell (1) is made of metal material, and the shell (1) is provided with a grounding point (12).

8. The electromagnetic field detection apparatus of an Internet of Things sensor according to any one of claims 1-4, characterized in that: The shield cover (3) is made of low-resistance material with good conductivity, and the shield cover (3) and the shell (1) are conductive.

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