CN110632371A - Charged non-contact detection device and method for object surface - Google Patents
Charged non-contact detection device and method for object surface Download PDFInfo
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- CN110632371A CN110632371A CN201910941375.0A CN201910941375A CN110632371A CN 110632371 A CN110632371 A CN 110632371A CN 201910941375 A CN201910941375 A CN 201910941375A CN 110632371 A CN110632371 A CN 110632371A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
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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
- G01R29/12—Measuring electrostatic fields or voltage-potential
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Abstract
The invention provides a charged non-contact detection device and method for the surface of an object, which comprises the following steps: a transparent housing; the electric field sensor is arranged in the shell, and the signal conditioning circuit, the control processing unit, the display unit and the power supply unit are connected with the electric field sensor; transparent epoxy resin is filled and sealed between the transparent shell and each part in the transparent shell, and the control processing unit is further connected with an alarm buzzer and an infrared inductor. By implementing the invention, the charged state of an object, particularly a metal plane surface can be accurately identified in the actual use process, and a guarantee means is provided for the safe development of production and life.
Description
Technical Field
The invention relates to the technical field of electric power safety, in particular to a charged non-contact monitoring device and method for the surface of an object.
Background
The charged surface of an object has huge potential safety hazards, common reports of accidents caused in production and life usually use a pen to measure by direct contact of a human body, but a mature, simple and reliable identification method does not exist in the prior art.
Disclosure of Invention
The invention aims to solve the technical problem of providing a non-contact monitoring device and a non-contact monitoring method for the electrification of the surface of an object, so as to realize the indication of the electrification state of the surface of the object, provide the safe operation of equipment and simultaneously provide warning and guarantee functions for ensuring the personal safety of an operator.
In order to solve the above technical problem, the present invention provides a non-contact monitoring device for monitoring the surface of an object with electricity, comprising:
a transparent housing;
the non-contact electric field sensor is arranged in the shell, and the signal conditioning circuit, the control processing unit, the display unit and the power supply unit are connected with the electric field sensor; the electric field sensor is used for sensing the size of a power frequency electric field on the surface of an object, and the signal conditioning circuit is mainly used for amplifying an output signal of the sensor; the control processing unit is used for analyzing and processing the amplification information output by the signal conditioning circuit; the display unit is used for displaying the charged state of the surface of an object and indicating low electric quantity, and the power supply unit provides a working power supply for the whole device;
transparent epoxy resin is encapsulated between the transparent shell and each part in the transparent shell;
wherein, the control processing unit is further connected with an alarm buzzer and an infrared inductor.
Preferably, the object surface electric field sensor is composed of two printed PCBs which are orthogonal in space, the PCB is made of FR4, the dielectric constant is about 4.2, the plate thickness is 1.6mm, one of the PCBs is printed with a square-wave conductor on the top layer, the width of the conductor is 1mm, the radius of gyration is 3mm, the total length is 2450mm, the other PCB is printed with the same square-wave conductor, the two PCBs are arranged in a staggered manner with the first PCB, the tail end of the conductor is provided with a matching circuit, the resistance is 1M, the capacitance is nF, the two PCBs form an electric field resonant cavity, and a voltage which is proportional to the excitation source is generated at the output end under the excitation of the.
Preferably, the signal conditioning circuit comprises:
the first resonant circuit consists of a resistor R6 and a capacitor C3 which are connected in parallel and is arranged at one end of the electric field sensor;
the second resonant circuit consists of a resistor R7 and a capacitor C4 and is arranged at the other end of the electric field sensor;
a first stage amplifier, associated with the first and second resonant circuits, composed of a resistor R3, a resistor R9, a resistor R2, a resistor R10, a capacitor C4 and a comparator U12B, for amplifying an electric field signal output from the sensor;
the second-stage amplifier is connected to the rear end of the first-stage amplifier and consists of a capacitor C5, a resistor R1, a resistor R42, a resistor R52, a capacitor C6, a resistor R5 and a comparator U12A;
the comparator U12B and the comparator U12A are OPA2379AID in model.
Preferably, the control processing unit consists of a capacitor C1, a capacitor C9, a resistor R11, a processing chip U1 and a second chip J1, the model of the processing chip U1 is PIC16F1518-E/SS, the third pin of the processing chip U1 inputs a signal UAD1 after electric field amplification, the 4 th pin inputs an infrared signal, and the 23 th pin outputs an alarm control signal to the shutter.
Preferably, the display comprises an alarm indicator and a low-electricity indicator, the alarm indicator and the low-electricity indicator adopt an LCD display screen, and the LCD display screen consists of a liquid crystal optical gate and is used for reducing the power consumption of the alarm indicator.
Preferably, the infrared sensor is used for recognizing a characteristic infrared signal of 30-100 Hz and starting a buzzer to give an alarm.
Preferably, the power supply unit comprises a battery and an electric quantity detection circuit, the output voltage of the battery is 3.6V, the electric quantity is 0.5Ah, and when the electric quantity of the battery, namely the output voltage is smaller than a threshold value, the electric quantity detection circuit outputs a signal to control the LCD display screen to display.
Correspondingly, the invention also provides an object surface electrification detection method which is completed by adopting the device, and the method comprises the following steps:
step S1, calculating an effective value, wherein the number of sampling points is 32, and the reference voltage is 2.5V;
step S2, calculating the frequency of the signal, and calculating the frequency of the input signal according to the multiple zero-crossing points of the signal;
step S3, judging whether the signal is a power frequency signal according to the effective value and the frequency of the signal;
step S4, confirming whether to output LCD flicker control signal according to the judgment result; and if so, determining that the signal surface is electrified, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
Preferably, further comprising:
and step S5, if the infrared sensor recognizes a characteristic infrared signal of 30-100 Hz, determining that a person approaches, starting a buzzer to give an alarm, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
The embodiment of the invention has the beneficial effects that:
the electric field sensor, the signal conditioning circuit, the control processing unit, the display unit and the power supply unit are arranged in the transparent shell, the signal conditioning circuit, the control processing unit, the display unit and the power supply unit are connected with the electric field sensor, so that the accurate indication of the charged state of the surface of an object can be realized, and the warning and guarantee effects are provided for the safety of equipment and operators.
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 diagram of a circuit framework of a non-contact monitoring device for monitoring charged surface of an object according to the present invention;
FIG. 2 is a circuit schematic of the signal conditioning circuit of FIG. 1;
FIG. 3 is a schematic circuit diagram of the control processing unit of FIG. 1;
FIG. 4 is a circuit schematic of the interface circuit referred to in FIG. 1;
FIG. 5 is a schematic diagram of a wiring structure of a PCB board in the electric field sensor;
fig. 6 is a schematic main flow chart of a non-contact monitoring method for charging a surface of an object according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The following description of the embodiments refers to the accompanying drawings, which are included to illustrate specific embodiments in which the invention may be practiced.
Referring to fig. 1, a schematic diagram of a circuit framework architecture of a non-contact monitoring device for monitoring surface electrification of an object according to the present invention is shown; referring to fig. 2 to 5 together, in this embodiment, the object surface electrification monitoring apparatus includes:
a transparent housing;
the electric field sensor 10 is arranged in the shell, and the signal conditioning circuit 11, the control processing unit 12, the display unit 14 and the power supply unit 13 are connected with the electric field sensor 10; the electric field sensor 10 is used for sensing the size of an electric field on the surface of an object, particularly a power frequency electric field, and the signal conditioning circuit 11 is mainly used for amplifying an output signal of the sensor; the control processing unit 12 is configured to analyze and process the amplification information output by the signal conditioning circuit 11, and output a driving signal for driving the display unit 14; the display unit 14 is used for displaying the charged state of the surface of an object and indicating low electric quantity, the power supply unit 13 provides a working power supply for the whole device, simultaneously monitors the voltage of the power supply unit, and sends alarm information when the voltage is higher than a threshold value;
wherein, the control processing unit 12 is further connected with an alarm buzzer 15 and an infrared sensor 15.
Transparent epoxy resin is encapsulated between the transparent shell and each part in the transparent shell;
as shown in fig. 2, a schematic diagram of the inductive circuitry in a piece of PCB board is shown. The electric field sensor is used for sensing the size of an electric field on the surface of an object and comprises two PCB boards which are orthogonal in space, and sensing lines are printed on opposite surfaces of the two PCB boards. In a practical example, the object surface electric field sensor is composed of two printed PCBs orthogonal to each other in space, the PCB is made of FR4, the dielectric constant is about 4.2, and the plate thickness is 1.6mm, one of the PCBs is printed with a meander-shaped lead at the top layer, the width of the lead is 1mm, the radius of gyration is 3mm, and the total length is 2450mm, the other PCB is printed with the same meander-shaped lead, the PCB is placed in a staggered manner with the first PCB, the tail end of the lead is provided with a matching circuit, the resistance is 1M, the capacitance is nF, and the two PCBs form an electric field resonant cavity, and a voltage proportional to the excitation source is generated at the output end under the excitation of.
In a specific example, the electric field sensor, the signal conditioning circuit, the control processing unit, the display unit and the power supply are arranged in a transparent shell with the thickness of 50 x 45 x 5mm, the interior of the transparent shell is encapsulated by transparent epoxy resin, the protection grade is superior to IP67, and the transparent shell is suitable for various use environments.
As shown in fig. 3 to 5, a schematic circuit diagram of an object surface charged non-contact detection device is shown. In particular, the amount of the solvent to be used,
the signal conditioning circuit includes:
the first resonant circuit consists of a resistor R6 and a capacitor C3 which are connected in parallel and is arranged at one end of the electric field sensor;
the second resonant circuit consists of a resistor R7 and a capacitor C4 and is arranged at the other end of the electric field sensor;
a first stage amplifier, associated with the first and second resonant circuits, composed of a resistor R3, a resistor R9, a resistor R2, a resistor R10, a capacitor C4 and a comparator U12B, wherein the amplifier has a cut-off frequency of 5Hz and a gain of 2500, and is used for amplifying the electric field signal output by the sensor; the U12B model is OPA2379 AID;
the second-stage amplifier is connected to the rear end of the first-stage amplifier, consists of a capacitor C5, a resistor R1, a resistor R42, a resistor R52, a capacitor C6, a resistor R5 and a comparator U12A, has the gain of 2, and is used for enabling the total amplification factor of signals to be 5000; the U12A model is OPA2379 AID;
the control processing unit consists of a capacitor C1, a capacitor C9, a resistor R11, a processing chip U1 and a processing chip J1, wherein the model of the processing chip U1 is PIC16F1518-E/SS, the third pin of the processing chip U1 inputs a signal UAD1 after an electric field is amplified, the 4 th pin inputs an infrared signal, and the 23 rd pin outputs an alarm control signal to the shutter.
The power supply circuit comprises a battery and an electric quantity detection circuit, the output voltage of the battery is 3.6V, the electric quantity is 0.5Ah, and when the electric quantity of the battery, namely the output voltage is smaller than a threshold value, the electric quantity detection circuit outputs a signal to control the LCD to indicate.
Further the display includes alarm indicator and low electric quantity indicator, alarm indicator and low electric quantity indicator adopt the LCD display screen, the LCD display screen comprises the liquid crystal optical gate for reduce the alarm and instruct the power consumption. Further, the alarm indicator is used for indicating the charged state of the surface of the object, the low-power indicator is used for indicating the power of the battery, the working voltage is 3.3v, and the frequency of the control signal is 5 Hz.
Further referring to the interface circuit in fig. 5, P1 is a battery interface, P2 is a powered alarm shutter interface, U2 is a battery level monitor chip, P3 is a battery level alarm shutter interface, and P4 is an infrared sensor interface.
Accordingly, as shown in fig. 6, it is a main flow chart of the method for detecting the surface electrification of the object according to the present invention. In this embodiment, the method for detecting the charged surface of the object in a non-contact manner is implemented by using the apparatus shown in fig. 1 to 5, and the method includes the following steps:
step S1, calculating an effective value, wherein the number of sampling points is 32, and the reference voltage is 2.5V;
step S2, calculating the frequency of the signal, and calculating the frequency of the input signal according to the multiple zero-crossing points of the signal;
step S3, judging whether the signal is a power frequency signal according to the effective value and the frequency of the signal;
step S4, confirming whether to output LCD flicker control signal according to the judgment result; and if so, determining that the signal surface is electrified, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
In some specific examples, the method further comprises:
and step S5, if the infrared sensor recognizes a characteristic infrared signal of 30-100 Hz, determining that a person approaches, starting a buzzer to give an alarm, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
The embodiment of the invention has the beneficial effects that:
by arranging the non-contact electric field sensor in the transparent shell, and the signal conditioning circuit, the control processing unit, the display unit and the power supply unit which are connected with the electric field sensor, the accurate indication of the charged state of the surface of an object can be realized, and the warning and guarantee effects are provided for the safety of equipment and operators.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. An object surface charged non-contact monitoring device, comprising:
a transparent housing;
the electric field sensor is arranged in the shell, and the signal conditioning circuit, the control processing unit, the display unit and the power supply unit are connected with the electric field sensor; the electric field sensor is used for non-contact sensing of the size of a power frequency electric field on the surface of an object, and the signal conditioning circuit is mainly used for amplifying an output signal of the sensor; the control processing unit is used for analyzing and processing the amplified information output by the signal conditioning circuit and outputting a driving signal for driving the display unit; the display unit is used for displaying the charged state of the surface of an object and indicating low electric quantity, and the power supply unit provides a working power supply for the whole device;
transparent epoxy resin is encapsulated between the transparent shell and each part in the transparent shell;
wherein, the control processing unit is further connected with an alarm buzzer and an infrared inductor.
2. The apparatus of claim 1, wherein the object surface electric field sensor comprises two spatially orthogonal printed PCBs, one printed with meander lines on a top layer and the other printed with the same meander lines, offset from the first, the two PCBs forming an electric field resonant cavity for generating a voltage at the output proportional to the excitation source under excitation by the power frequency electromagnetic field.
3. The apparatus of claim 2, wherein the signal conditioning circuit comprises:
the first resonant circuit consists of a resistor R6 and a capacitor C3 which are connected in parallel and is arranged at one end of the electric field sensor;
the second resonant circuit consists of a resistor R7 and a capacitor C4 and is arranged at the other end of the electric field sensor;
a first stage amplifier, associated with the first and second resonant circuits, composed of a resistor R3, a resistor R9, a resistor R2, a resistor R10, a capacitor C4 and a comparator U12B, for amplifying an electric field signal output from the sensor;
the second-stage amplifier is connected to the rear end of the first-stage amplifier and consists of a capacitor C5, a resistor R1, a resistor R42, a resistor R52, a capacitor C6, a resistor R5 and a comparator U12A;
the comparator U12B and the comparator U12A are OPA2379AID in model.
4. The device as claimed in claim 3, wherein the control processing unit is composed of a capacitor C1, a capacitor C9, a resistor R11, a processing chip U1 and a second chip J1, the model of the processing chip U1 is PIC16F1518-E/SS, the third pin inputs a signal UAD1 after electric field amplification, the 4 th pin inputs an infrared signal, and the 23 rd pin outputs an alarm control signal to the shutter.
5. The apparatus of claim 4, wherein the display comprises an alarm indicator and a low-power indicator, the alarm indicator and the low-power indicator using an LCD display screen, the LCD display screen consisting of liquid crystal shutters for reducing alarm indication power consumption.
6. The device as claimed in claim 5, wherein the infrared sensor is used for identifying a characteristic infrared signal of 30-100 Hz and starting a buzzer to alarm.
7. The apparatus of claim 6, wherein the power supply unit comprises a battery and a power detection circuit, the battery has an output voltage of 3.6V and a power of 0.5Ah, and when the battery power, i.e. the output voltage, is less than a threshold, the power detection circuit outputs a signal to control the LCD display to display.
8. A method for non-contact detection of the surface electrification of an object, characterized in that it is carried out with a device as provided in any one of claims 1 to 7, said method comprising the steps of:
step S1, calculating an effective value, wherein the number of sampling points is 32, and the reference voltage is 2.5V;
step S2, calculating the frequency of the signal, and calculating the frequency of the input signal according to the multiple zero-crossing points of the signal;
step S3, judging whether the signal is a power frequency signal according to the effective value and the frequency of the signal;
step S4, confirming whether to output LCD flicker control signal according to the judgment result; and if so, determining that the signal surface is electrified, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
9. The method of claim 8, further comprising:
and step S5, if the infrared sensor recognizes a characteristic infrared signal of 30-100 Hz, determining that a person approaches, starting a buzzer to give an alarm, outputting an LCD flicker control signal, and controlling an LCD display screen to flicker.
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