An electrostatic field sensor

Abstract

The present application discloses an electrostatic field sensor for effectively detecting an electrostatic field environment. The present application provides an electrostatic field sensor comprising: a magnetic field unit for periodically generating an electromagnetic field; a switch unit comprising a switch that is periodically opened and closed based on the electromagnetic field, wherein the first end of the switch is electrically connected to the first end of the power supply, the second end of the switch is electrically connected to the first end of the electrostatic induction unit, and the second end of the power supply is electrically connected to the second end of the electrostatic induction unit; the electrostatic induction unit comprises a first induction layer and a second induction layer, an insulating layer is arranged between the first induction layer and the second induction layer, the insulating layer comprises a resistor connected between the first induction layer and the second induction layer, and the first induction layer and the second induction layer are arranged in the device to be tested; an electrostatic detection unit is used to detect the electrostatic field strength of the device to be tested according to the periodic electromagnetic field and the potential difference between the first induction layer and the second induction layer.

Description

Technical Field

[0001] The present application relates to the field of sensors, and in particular to an electrostatic field sensor. Background Art

[0002] With the development of sensing technology and precision measurement science, whether it is aerospace landers, atmospheric science, ultra-high voltage transmission lines, etc., it is necessary to monitor the electromagnetic field environment in the air to serve the smooth progress of scientific and people's livelihood projects.

[0003] In the field of sensors, there are various sensors such as sound, light, thermal, and ultrasonic sensors, but there are many limitations and difficulties in the development and production of electrostatic field sensors. Although there are theoretically feasible electrostatic field sensors, most of them are difficult to produce and use due to their large size. Some other detection principles are based on traditional induction detection methods, which can only detect composite electric field environments, but cannot effectively detect electrostatic field environments, and cannot serve the precision detection needs of scientific research.

[0004] How to effectively detect the electrostatic field environment is the technical problem to be solved by this application. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide an electrostatic field sensor for effectively detecting an electrostatic field environment.

[0006] The present application embodiment provides an electrostatic field sensor, comprising:

[0007] A magnetic field unit, used for periodically generating an electromagnetic field;

[0008] a switch unit, comprising a switch that is periodically opened and closed based on the electromagnetic field, wherein a first end of the switch is electrically connected to a first end of a power source, a second end of the switch is electrically connected to a first end of an electrostatic induction unit, and a second end of the power source is electrically connected to a second end of the electrostatic induction unit;

[0009] An electrostatic induction unit, comprising a first induction layer located at a first end of the electrostatic induction unit and a second induction layer located at a second end of the electrostatic induction unit, an insulating layer is arranged between the first induction layer and the second induction layer, the insulating layer comprises a resistor connected between the first induction layer and the second induction layer, and the first induction layer and the second induction layer are arranged in a device to be tested;

[0010] An electrostatic detection unit, wherein a first end of the electrostatic detection unit is electrically connected to the first induction layer, a second end of the electrostatic detection unit is electrically connected to the second induction layer, and the electrostatic detection unit is used to detect the electrostatic field strength of the device to be tested based on the electromagnetic field and the potential difference between the first induction layer and the second induction layer.

[0011] In the embodiment of the present application, the periodic opening and closing of the switch is controlled by the periodic electromagnetic field, so that the switch unit periodically disturbs the electrostatic field of the electrostatic induction unit, so that the charges in the two induction layers of the electrostatic induction unit are subject to the electric field force fluctuation, and the electrostatic field detection is realized by detecting the fluctuation through the electrostatic detection unit. In this solution, the electrostatic field balance is broken by controlling the electromagnetic field, which can help reduce the size of the electrostatic field sensor, facilitate its application in precision equipment, and improve the accuracy of electrostatic field detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0013] Figure 1 This is one of the structural schematic diagrams of an electrostatic field sensor according to an embodiment of the present application;

[0014] Figure 2 This is a second structural schematic diagram of an electrostatic field sensor according to an embodiment of the present application;

[0015] Figure 3a This is a third structural schematic diagram of an electrostatic field sensor according to an embodiment of the present application;

[0016] Figure 3b It is a schematic diagram of a partial circuit structure of an electrostatic field sensor according to an embodiment of the present application;

[0017] Figure 4 This is one of the structural schematic diagrams of an electrostatic detection unit in an electrostatic field sensor according to an embodiment of the present application;

[0018] Figure 5 This is a second structural schematic diagram of an electrostatic detection unit in an electrostatic field sensor according to an embodiment of the present application;

[0019] Figure 6 This is the third structural schematic diagram of an electrostatic detection unit in an electrostatic field sensor according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application. The numbering of the drawings in this application is only used to distinguish the various steps in the scheme, and is not used to limit the execution order of the various steps. The specific execution order is subject to the description in the specification.

[0021] The electrostatic field sensor provided in the embodiment of the present application has a wide range of application scenarios, for example, the electrostatic field sensor can be used in positioning systems such as Beidou navigation. In the application, the signal receiving device can use electromagnetic waves for navigation and positioning, specifically for the detection, analysis, filtering, and analog-to-digital conversion of weak signals of the electromagnetic field.

[0022] For another example, in the Martian and lunar atmosphere monitoring scenarios, space monitoring and electromagnetic field spectrum analysis of Mars and the Moon can infer environmental changes on the planets over hundreds of millions of years. The strength of the magnetic and electric fields can also locate the spatial direction of the lunar rover and the Mars rover, providing scientific data for human settlement in outer space.

[0023] In the field of electrostatic field sensors, the electrostatic field can be disturbed through the field grinding electrostatic field detection unit, and then the electrostatic force can be measured. This detection scheme is based on electrostatic sensing technology and is suitable for industrial frequency electric fields and high-frequency electric fields. This field source is a scene that can spontaneously generate a spectrum. Among them, the field grinding electrostatic field detection unit contains a motor, and the shielding layer is driven by the rotation of the motor to rotate, so that the shielding layer periodically blocks the electrostatic induction plate. When the electrostatic induction plate is blocked, the electrostatic force does not act. At this time, the electrostatic induction plate can be connected to obtain the power plant information sensed by the electrostatic induction plate. Among them, the rotation frequency of the motor and the disturbance effect determine the frequency of the electrostatic induction plate signal release.

[0024] For the field mill type electrostatic field detection unit, its essence includes a conductor sheet, which forms a temporary capacitor when the conductor sheet and the object being measured are close to each other. Among them, the stronger the electrostatic field of the object being measured, the more induced charge the conductor sheet will have, and the higher the voltage to the ground will be. By detecting this voltage, the electrostatic strength of the object being measured can be estimated.

[0025] Although this method can estimate the electrostatic strength of the object being measured, the electric field estimated by this method is actually a coincidence field, not a pure electrostatic field. This composite field belongs to the vector superposition state of the electrostatic field and the frequency band field, which can continuously stimulate the surging electric field information, causing the electric field force to change continuously. Based on this change, the system senses the changing electric field information through detection technology, and based on the characteristics of the unbalanced electric field force, it is easy to form a discharge circuit.

[0026] A pure electrostatic field belongs to a constant system, and the electrostatic field system is in electrostatic equilibrium with the outside world. In other words, the electrostatic field does not discharge without external interference and cannot be directly detected. In addition, in the scheme of electrostatic detection based on motors, the motor is a necessary element to disturb the electrostatic field. The motor itself is large in size, making it difficult to perform electrostatic field detection on small precision instruments. Due to the above reasons, it is difficult to detect pure electrostatic fields in the field of electrostatic field detection.

[0027] In order to solve the problems existing in the prior art, the present application embodiment provides an electrostatic field sensor, such as Figure 1 As shown, including:

[0028] The magnetic field unit 11 is used to periodically generate an electromagnetic field.

[0029] In practical applications, the magnetic field unit can generate an electromagnetic field periodically in response to a control instruction, wherein the control instruction can be generated by a microcontroller unit, and the control instruction can adjust the frequency according to actual needs, thereby controlling the electromagnetic field to generate an electromagnetic field according to a required period.

[0030] The switch unit 12 includes a switch that is periodically opened and closed based on the electromagnetic field, wherein a first end of the switch is electrically connected to a first end of a power supply, a second end of the switch is electrically connected to a first end of an electrostatic induction unit, and a second end of the power supply is electrically connected to a second end of the electrostatic induction unit.

[0031] exist Figure 1 In the figure, the first end of the switch is shown as a, the second end of the switch is shown as b, the first end of the power supply is shown as c, the second end of the power supply is shown as d, the first end of the electrostatic induction unit is shown as e, and the second end of the electrostatic induction unit is shown as f.

[0032] In the switch unit, the switch is controlled by the electromagnetic field to open and close periodically. Specifically, the switch can be a normally open switch. After the magnetic field unit generates an electromagnetic field, the switch is closed by the electromagnetic field, thereby performing periodic opening and closing under the control of the periodic electromagnetic field. When the switch is disconnected, the electrostatic field is in a balanced state. At the moment the switch is closed, the current will instantly pass through the switch, breaking the equilibrium state of the electrostatic force.

[0033] In practical applications, the power supply voltage can be set according to the actual electrostatic voltage. For example, assuming that the voltage of the sensing layer is at the millivolt level, the power supply voltage is also set to the millivolt level accordingly.

[0034] The electrostatic induction unit 13 includes a first induction layer located at a first end of the electrostatic induction unit and a second induction layer located at a second end of the electrostatic induction unit, an insulating layer is arranged between the first induction layer and the second induction layer, the insulating layer includes a resistor connected between the first induction layer and the second induction layer, and the first induction layer and the second induction layer are arranged in the device to be tested.

[0035] The first sensing layer and the second sensing layer may be sensing layers arranged in the device under test. Optionally, the first sensing layer and the second sensing layer are arranged on the surface of the device under test, or the first sensing layer and the second sensing layer are arranged on the surface of the device under test in the device under test.

[0036] The insulating layer and the resistor disposed between the first sensing layer and the second sensing layer can be used to form a potential difference between the first sensing layer and the second sensing layer, so that the static electricity detection unit can realize static electricity detection through the first sensing layer and the second sensing layer.

[0037] In practical applications, a resistor with a suitable resistance value can be selected according to the actual electrostatic voltage. For example, assuming that the voltage of the above-mentioned sensing layer is at the millivolt level, a 1 ohm resistor can be selected.

[0038] An electrostatic detection unit 14, wherein a first end of the electrostatic detection unit is electrically connected to the first induction layer, and a second end of the electrostatic detection unit is electrically connected to the second induction layer, and the electrostatic detection unit is used to detect the electrostatic field strength of the device to be tested based on the electromagnetic field and the potential difference between the first induction layer and the second induction layer.

[0039] Since the electrostatic field is in an electrical equilibrium state when it is not disturbed, there will be no current flowing in or out, so it cannot be detected directly through wired detection. In this solution, the periodic opening and closing of the switch is controlled by a periodic electromagnetic field, so that the switch unit periodically disturbs the electrostatic field of the electrostatic induction unit, causing the charges in the two induction layers of the electrostatic induction unit to fluctuate due to the electric field force, and the electrostatic detection unit detects the fluctuation to realize electrostatic field detection.

[0040] Among them, after the switch in the on state is disconnected, the potential of the first induction layer and the first end of the switch are superimposed, and the second induction layer is in contact with the second end of the power supply and grounded. Since the second induction layer is locked by the electrostatic force, at this time, the first induction layer can form a new potential difference through the isolation of the insulating layer and the resistor under the support of the potential of the first end of the switch, so that the electrostatic detection unit can realize electrostatic force detection based on the potential difference between the first induction layer and the second induction layer.

[0041] The solution provided by the embodiment of the present application controls the periodic opening and closing of the switch through a periodic electromagnetic field, so that the switch unit periodically disturbs the electrostatic field of the electrostatic induction unit, causing the charges in the two induction layers of the electrostatic induction unit to fluctuate due to the electric field force, thereby realizing electrostatic field detection by detecting the fluctuation through the electrostatic detection unit. In this solution, the electrostatic field balance is broken by controlling the electromagnetic field, which can help reduce the size of the electrostatic field sensor, be beneficial for application in precision equipment, and improve the accuracy of electrostatic field detection. This solution does not require the use of such a mechanical disturbance method as the rotation of the motor. By controlling the on and off of the switch through the magnetic field, the size of the detection equipment can be effectively reduced, which is more conducive to performing electrostatic detection on precision equipment.

[0042] Optionally, based on the electrostatic field sensor provided in the above embodiment, Figure 2 As shown, the electrostatic detection unit includes a micro control unit;

[0043] The micro control unit is used to provide power to the switch unit through the first interface;

[0044] The micro control unit is used to collect the potential difference between the first sensing layer and the second sensing layer through the second interface, and detect the electrostatic field strength of the device to be tested according to the electromagnetic field.

[0045] In this example, the electrostatic detection unit includes a microcontroller unit (MCU), and the first interface of the MCU is Figure 2 As shown in j, the second interface is Figure 2 Indicated by i.

[0046] Among them, the electrostatic detection unit provides a stable power supply to the first end of the switch through the first interface, which can make the current pass through the switch instantly when the switch is closed under magnetic field control, so as to achieve the purpose of breaking the electrostatic field balance. The power supply provided by the MCU to the switch unit can be specifically at the millivolt level, which matches the actual static electricity of the device to be tested. In addition, the MCU collects the potential difference between the first sensing layer and the second sensing layer through the second interface, so as to calculate the electrostatic strength of the device to be tested based on the collected information.

[0047] Optionally, based on the electrostatic field sensor provided in the above embodiment, Figure 3a As shown, the micro control unit is used to send a rectangular pulse wave to the magnetic field unit through a third interface, and the rectangular pulse wave is used to control the coil in the magnetic field unit to periodically generate an electromagnetic field.

[0048] exist Figure 3a In the figure, the third interface of the microcontroller unit MCU is shown as k. In practical applications, one end of the coil is electrically connected to the third interface of the MCU to receive the rectangular pulse wave sent by the MCU. The other end of the coil can be grounded.

[0049] Figure 3b shows a partial circuit structure diagram of the electrostatic field sensor, Figure 3b The device includes a magnetic field unit 1, which includes a coil. The switch unit includes a switch 2. The electrostatic induction unit includes a first induction layer 3, a second induction layer 4, an insulating layer 5 and a resistor 6.

[0050] The positive pole of the power supply shown in the magnetic field unit and the switch unit indicates the connection to the MCU port, and the negative pole indicates the grounding. One end of the coil in the magnetic field unit is grounded, and the other end can be connected to the GPIO port of the MCU. One end of the switch in the switch unit is connected to the first induction layer, and the other end can be connected to the GPIO port of the MCU.

[0051] Optionally, based on the electrostatic field sensor provided in the above embodiment, the third interface of the micro control unit is a general input and output port in push-pull output mode.

[0052] In this example, one end of the coil is connected to the MCU unit through the GPIO port. The GPIO unit of the MCU belongs to the central processing unit and outputs a weak signal of 01 according to the program. In this example, the GPIO port is configured as a push-pull output mode, that is, the output voltage is controlled by the switch of the transistor when the high and low levels are output. In the push-pull output mode, the GPIO can output high and low levels and has a certain driving capability.

[0053] In addition, the first end of the switch in the above switch unit can also be connected to the GPIO interface of the MCU unit.

[0054] Optionally, based on the electrostatic field sensor provided in the above embodiment, the coil in the magnetic field unit is a coil in an electromagnetic relay;

[0055] The switch in the switch unit is a switch composed of a moving contact and a stationary contact in the electromagnetic relay.

[0056] In this example, the electromagnetic relay is an electronic control device, which includes an input circuit and an output circuit. It can achieve the purpose of using a smaller current and a lower voltage to control a larger current and a higher voltage. By controlling the coil to generate a magnetic field, the switch can be flexibly controlled to open and close.

[0057] Next, combine Figure 3b To further explain the electrostatic field detection principle of this solution, the electrostatic field sensor has the following multiple states:

[0058] Electromagnetic induction current breaking state. Assuming that the MCU outputs a 10HZ PWM wave (rectangular pulse wave with continuously adjustable pulse width) to the magnetic field unit, the coil of the magnetic field unit is periodically powered on and off under the action of the PWM wave. According to Faraday's law of electromagnetic induction, electricity generates magnetism, and the generated magnetic field generates a magnetic field on switch 2 in the switch unit. According to the left-hand rule, the on and off of the magnetic field unit 1 can control the attraction of the switch, so that the switch is in a 10HZ periodic on and off mode.

[0059] The charge state is introduced by the switching current. In the switch unit, one end of the switch is connected to the GPIO unit of the MCU through the positive pole of the power supply. The system's LDO power supply unit (low dropout regulator) provides a switching power supply with small ripple. Based on the periodic on-off changes of the switch, 7 and 8 generate the on-off of the current accordingly.

[0060] Based on the above periodic on-off, in the electrostatic induction unit, the first induction layer 3 and the second induction layer 4 can be copper-clad laminates under PCB (Printed Circuit Board) technology. In the semiconductor field, copper-clad laminates can be used for electromagnetic interference prevention and grounding. In this solution, copper-clad laminates are used as signal sensing units, which is more conducive to commercialization.

[0061] In the electrostatic induction unit, when the switch 2 of the switch unit is in the cut-off state, the first induction layer 3 and the second induction layer 4 sense the electrostatic field signal, and the system as a whole is in an electrostatic force balance state. At this time, the induction layer is connected to the detection, and the signal cannot be released. Since the detection unit often obtains the signal by detecting the potential of the induction plate, for signals with frequency bands, detection is achieved by surging and amplifying weak signals. However, for an electrostatically balanced system, it is a constant value no matter where it is. The root cause is that the field in the space locks the electrons in the induction layer. This solution breaks the electrostatic balance by controlling the periodic opening and closing of switch 2.

[0062] Among them, switch 2 of the switch unit is temporarily closed under the attraction of the magnetic field generated by the magnetic field unit 1. At this time, the current instantly passes through switch 2, that is, a large amount of charge information enters the induction plate, and the induction plate generates a transverse electric field and a spatial electric field vector superposition. When the magnetic field is periodically closed and switch 2 of the switch unit is disconnected accordingly, the balance of force is broken, so that the electrostatic detection unit can detect the electrostatic field information with a frequency band.

[0063] The first sensing layer 3 and the second sensing layer 4 form an electric potential between the resistor and the insulating layer 6. When the switch 2 is turned off, the first sensing layer 3 and the switch 2 potential are superimposed, and the second sensing layer 4 is in contact with the ground. Since the second sensing layer 4 is locked by the electrostatic force, the first sensing layer 3 forms a new potential difference through the isolation of the insulating layer and the resistor under the support of the switch 2 potential, and the electrostatic detection unit can detect the signal to perform electrostatic field signal processing.

[0064] This application proposal uses a dynamic control method to disturb the environmental electric field information to achieve the purpose of detection. Among them, the electrostatic balance of the electrostatic field is broken by the Ampere force, and the principle of relay electromagnetism is used to build a new electromagnetic balance system. This solution first breaks the balance system of electricity, then reconstructs the electrostatic balance relationship, and finally couples the sensor device through the miniaturization idea of ​​MEMS (MicroelectroMechanical Systems).

[0065] In the solution provided in the embodiment of the present application, optionally, the first induction layer and the second induction layer are copper-clad boards of a printed circuit board in the device under test. This solution uses a PCB copper-clad board as part of an electrostatic induction unit, and controls the electrostatic balance of the electric field force in the circuit loop through the cooperation of a relay and a resistor.

[0066] Specifically, the electrostatic induction unit includes the following parts:

[0067] Induction layer. In practical applications, 2 cm of the copper clad laminate can be used as an induction unit, and white paint can be used to reduce the distortion of the induced electric field and protect the service life of the copper clad laminate.

[0068] Relay. This solution can be implemented using a relay chip, which is a microchip that controls the potential of the relay through a pull-up resistor, uses a transistor to provide a large current to control the direction of the relay's pull-in, and provides a PWM wave through the software algorithm of the microcontroller, so that the relay generates an electromagnetic field at a certain frequency, thereby controlling the on and off of the sensor unit.

[0069] Potential resistor. This solution uses a power balancing resistor, based on the periodic on-off cycle of the relay. When the relay is turned on, the induction plate and the power ground are at the same potential, and when the relay is turned off, a potential difference is formed between the first induction plate 3 and the second induction plate 4.

[0070] This solution is based on the MEMS sensor concept. It does not require signal shielding based on mechanical control. It integrates the mechanical link with Faraday's law of electromagnetic induction and uses electronic design automation software to design PCB semiconductor circuit diagrams. The sensor can then be coupled to the device, which is more conducive to commercial use.

[0071] Next, the static electricity detection unit is further described.

[0072] Optionally, based on the electrostatic field sensor provided in the above embodiment, Figure 4 As shown, the electrostatic detection unit includes:

[0073] A common-phase amplifier 41, wherein a first input terminal of the common-phase amplifier is electrically connected to the first induction layer, a second input terminal of the common-phase amplifier is electrically connected to the second induction layer, and an output terminal of the common-phase amplifier is electrically connected to an input terminal of an analog-to-digital converter.

[0074] The analog-to-digital converter 42 has an output terminal electrically connected to the second interface of the micro control unit.

[0075] In the present application example, the detection principle of the in-phase amplifier is used for weak detection signals. The in-phase amplifier can achieve the amplification effect of the potential, and the resistor and relay are used to continuously reconstruct the electrostatic balance relationship, so that Faraday's electromagnetic field law is associated with Newton's three laws.

[0076] To facilitate the MCU to perform signal processing and analysis, the analog-to-digital converter converts the analog signal of the detection signal amplified by the in-phase amplifier into a digital signal so that the MCU can perform analysis and processing.

[0077] Optionally, based on the electrostatic field sensor provided in the above embodiment, Figure 5 As shown, the electrostatic detection unit further includes:

[0078] A filter 43, wherein the input end of the filter is electrically connected to the output end of the in-phase amplifier.

[0079] The power frequency trap 44 has an input end electrically connected to the output end of the filter, and an output end electrically connected to the input end of the analog-to-digital converter.

[0080] In the example of the present application, for the amplified detection signal, signal filtering optimization and frequency screening are performed through filters and industrial frequency traps, which effectively improves the quality of the analog signal input to the analog-to-digital converter, thereby improving the quality of the digital signal obtained by the MCU and improving the accuracy of electrostatic detection.

[0081] Optionally, based on the electrostatic field sensor provided in the above embodiment, Figure 6 As shown, the micro control unit is used to send the detected electrostatic field strength of the device under test to the host computer 45 for display through the serial communication unit.

[0082] The electrostatic field sensor provided in this proposal outputs an electrostatic field signal through an electrostatic field sensing unit, and then the electrostatic field detection unit realizes electrostatic field detection to obtain a spatial electric field signal. Among them, the millivolt level signal is amplified by a common-mode amplifier, the interference information is filtered by a filter, and then the analog signal is converted into a digital signal by an analog-to-digital converter so that the MCU can perform analysis and processing. After the MCU performs signal processing, the processing result is sent to the host computer for display through serial communication, forming a closed-loop monitoring of the device.

[0083] Based on the electrostatic field sensor provided in the above embodiment, optionally, the magnetic field unit, the switch unit, the electrostatic induction unit and the electrostatic detection unit are arranged in the device to be tested.

[0084] The solution provided by the embodiment of the present application can improve the integration of the equipment. When static electricity needs to be detected, the signal can be obtained through the serial port of the MCU. For small precision instruments, the static field sensor of this solution is integrated into the equipment, which can further improve the accuracy of static electricity detection, improve the convenience of detection, and facilitate production.

[0085] This proposal uses the principle of electromagnetic induction to reconstruct another system power supply circuit for the electrostatically balanced system. By using the microcontroller software algorithm to control the frequency of Faraday's law of electromagnetic induction, the power balance condition of the induction layer is changed, so that the lateral electric field generated by the induction plate becomes a superposition of vector mechanics with the spatial electric field, achieving the control effect of the self-excitation field. Among them, the mechanical problem of the shielding field is converted into an electrical problem that can be operated through software, and the basic principles of Faraday in physics are used to reconstruct the power balance in the circuit. In the detection of signals, the insulating layer and resistor elements of the copper clad board are uniquely used to dynamically construct the potential difference. This proposal uses the semiconductor PCB process to form a changing potential difference between the copper clad board, the insulating layer, and the resistor element through the opening and closing of the switch, so as to achieve the effect that can be detected by the common-mode amplifier.

[0086] The electrostatic field sensor proposed in this proposal can realize the automatic shielding function of the high-frequency signal through the software control of mechanical balance, and can also perform the rapid signal amplification function for the high-frequency circuit. For signal shielding and rapid signal detection in the communication field, it can meet the advantages of miniaturization and software operation. In the field of electromagnetic field communication and detection, industrial equipment and detection have high use value for the development of communication business.

[0087] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0088] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0089] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0090] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0091] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0092] The memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0093] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. Information can be computer readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disk read-only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0094] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0095] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0096] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. An electrostatic field sensor, characterized in that: include: A magnetic field unit, used for periodically generating an electromagnetic field; a switch unit, comprising a switch that is periodically opened and closed based on the electromagnetic field, wherein a first end of the switch is electrically connected to a first end of a power source, a second end of the switch is electrically connected to a first end of an electrostatic induction unit, and a second end of the power source is electrically connected to a second end of the electrostatic induction unit; An electrostatic induction unit, comprising a first induction layer located at a first end of the electrostatic induction unit and a second induction layer located at a second end of the electrostatic induction unit, an insulating layer is arranged between the first induction layer and the second induction layer, the insulating layer comprises a resistor connected between the first induction layer and the second induction layer, and the first induction layer and the second induction layer are arranged in a device to be tested; an electrostatic detection unit, wherein a first end of the electrostatic detection unit is electrically connected to the first induction layer, a second end of the electrostatic detection unit is electrically connected to the second induction layer, and the electrostatic detection unit is used to detect the electrostatic field strength of the device to be tested according to the electromagnetic field and the potential difference between the first induction layer and the second induction layer; The coil in the magnetic field unit is a coil in an electromagnetic relay; The switch in the switch unit is a switch composed of a moving contact and a stationary contact in the electromagnetic relay.

2. The electrostatic field sensor according to claim 1, characterized in that: The electrostatic detection unit includes a micro control unit; The micro control unit is used to provide power to the switch unit through the first interface; The micro control unit is used to collect the potential difference between the first sensing layer and the second sensing layer through the second interface, and detect the electrostatic field strength of the device to be tested according to the electromagnetic field.

3. The electrostatic field sensor according to claim 2, characterized in that: The micro control unit is used to send a rectangular pulse wave to the magnetic field unit through a third interface, and the rectangular pulse wave is used to control the coil in the magnetic field unit to periodically generate an electromagnetic field.

4. The electrostatic field sensor according to claim 3, characterized in that: The third interface of the micro control unit is a general input and output port in push-pull output mode.

5. The electrostatic field sensor according to any one of claims 2 to 4, characterized in that: The electrostatic detection unit comprises: a common-phase amplifier, wherein a first input terminal of the common-phase amplifier is electrically connected to the first inductive layer, a second input terminal of the common-phase amplifier is electrically connected to the second inductive layer, and an output terminal of the common-phase amplifier is electrically connected to an input terminal of an analog-to-digital converter; An analog-to-digital converter, wherein an output end of the analog-to-digital converter is electrically connected to the second interface of the micro control unit.

6. The electrostatic field sensor according to claim 5, characterized in that: The electrostatic detection unit further includes: A filter, wherein an input end of the filter is electrically connected to an output end of the in-phase amplifier; An industrial frequency trap, wherein the input end of the industrial frequency trap is electrically connected to the output end of the filter, and the output end of the industrial frequency trap is electrically connected to the input end of the analog-to-digital converter.

7. The electrostatic field sensor according to claim 5, characterized in that: The micro control unit is used to send the detected electrostatic field strength of the device to be tested to a host computer for display via a serial communication unit.

8. The electrostatic field sensor according to claim 1, characterized in that: The magnetic field unit, the switch unit, the electrostatic induction unit and the electrostatic detection unit are arranged in the device to be tested.

9. The electrostatic field sensor according to claim 1, characterized in that: The first sensing layer and the second sensing layer are copper-clad plates of a printed circuit board in the device under test.

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