CN113514710A - Electrostatic detection device - Google Patents
Electrostatic detection device Download PDFInfo
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- CN113514710A CN113514710A CN202111071283.5A CN202111071283A CN113514710A CN 113514710 A CN113514710 A CN 113514710A CN 202111071283 A CN202111071283 A CN 202111071283A CN 113514710 A CN113514710 A CN 113514710A
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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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- 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
- G01R29/24—Arrangements for measuring quantities of charge
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Abstract
A static detection device comprises a shell, a metal shielding cover arranged in the shell, a metal bracket, an induction metal sheet arranged in the metal bracket, a circuit board and net openings arranged at two ends of the static detection device, wherein the induction metal sheet, the metal bracket and the metal shielding cover are all arranged on the circuit board; wherein, the inner side of the metal bracket is attached with a piezoelectric ceramic piece; the metal shielding cover and the shell thereof are correspondingly provided with windows as detection areas at the positions of the metal induction sheets. The static electricity detection device can improve the static electricity detection precision and the static electricity detection range.
Description
Technical Field
The present invention relates to an electrostatic detection device.
Background
A conventional static electricity detection device generally detects static electricity using a vibration capacitance type sensor, which uses a piezoelectric ceramic as a vibration element. The vibration capacitor is a vibratable metal sheet, and due to mechanical vibration, the capacitance between the detection electrode and the object to be detected changes periodically, and under the action of electrostatic induction of the object to be detected, the voltage induced on the polar plate also changes periodically. The vibration capacitance type sensor senses an electrostatic electric field through alternating capacitance to measure electrostatic potential, and has the principle that the change of charges on a polar plate is caused by the change of a capacitance value C of a flat capacitor placed in the electrostatic field to generate a weak signal, and a weak signal detection circuit is used for amplifying the signal to generate voltage output.
However, the existing electrostatic detection device has the defects of low detection precision, low intelligent degree, small measuring range and the like.
Disclosure of Invention
The invention provides a static electricity detection device.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
an electrostatic detection apparatus, comprising: a housing including an upper case and a lower case; the electrostatic detection device comprises a metal shielding cover, a metal support, an induction metal sheet, a circuit board and a net opening, wherein the metal shielding cover and the metal support are arranged in a shell, the induction metal sheet and the circuit board are arranged in the metal support, and the net opening is arranged at two ends of the electrostatic detection device; the piezoelectric ceramic plates are attached to the two inner sides of the metal support; the metal shielding cover is arranged outside the metal bracket and realizes the function of isolating partial interference signals through grounding; the metal shielding cover and the shell thereof are correspondingly provided with windows as detection areas at the positions of the metal induction sheets; through the net gape that electrostatic sensor device both ends set up, can pass through the detected signal the host computer is uploaded to the net gape.
Wherein, in one embodiment, the metal bracket is formed by two metal sheets connected in an arch-shaped manner.
Wherein in another embodiment the metal holder may be formed by two separate metal sheets placed side by side.
Wherein, the circuit board and the piezoelectric ceramics are connected by using metal objects.
The piezoelectric ceramic sheet is lead titanate, barium titanate-lead titanate and lead zirconate titanate.
The thickness of the piezoelectric ceramic plate is 0-17 mm, the length of the piezoelectric ceramic plate is 1.5-74 mm, and the width of the piezoelectric ceramic plate is 0.01-65 mm.
The resonance frequency of the piezoelectric ceramic sheet material is 5 KHz-500 KHz, the anti-resonance frequency is 5 KHz-500 KHz, the electromechanical coupling coefficient is 0.001-10, and the capacitance is 3 pf-20 uf.
The shape of the induction metal sheet is square, and the area is 0.5 mm-63 cm.
Wherein, the thickness of the induction metal sheet is 0.01mm-17mm, the length is 12-73mm, and the width is 7-65 mm.
The induction metal sheet is made of metal with high conductivity coefficient of gold, silver or copper.
Wherein, the height arranged between the induction metal sheet and the circuit board is 3-67 mm.
Wherein, the thickness of the metal shielding case is 0.6-6.5mm, and the distance between the metal shielding case and the metal sheet is 1.6-43 mm.
The shell of the static electricity detection equipment is made of a conductor or a semiconductor material.
Wherein, the network port is an RS-485 or lora/lorawan interface.
According to the static detection device provided by the invention, the piezoelectric ceramic piece in a specific resonant frequency range is selected as a vibration source, so that only the frequency characteristic in the range needs to be extracted, and the static detection precision is improved.
According to the electrostatic detection device provided by the invention, the induction metal sheet with a specially designed size is adopted, and the electrostatic detection precision and the detection range are improved on the premise of ensuring the detection sensitivity.
The electrostatic detection circuit used for the electrostatic detection device further improves the electrostatic detection precision through the subsequent amplification module and the multistage filtering.
Drawings
FIG. 1 is a mechanical schematic of an electrostatic detection module;
FIG. 2 is a schematic diagram of the detection principle of the electrostatic detection module;
FIG. 3 is a circuit diagram of an amplifying module in the electrostatic detecting circuit
Fig. 4 is a circuit diagram of a filter module in the static electricity detection circuit.
Detailed Description
The invention is described in further detail below with reference to the drawings of the specification:
according to the attached figures 1-2:
an electrostatic detection device includes a housing including an upper case 1 and a lower case 2; the electrostatic detection device comprises a metal shielding cover 3, a metal support 4, an induction metal sheet 5 and a circuit board 6 which are arranged in the metal support 4, and a net opening 7 arranged at two ends of the electrostatic detection device, wherein the induction metal sheet 5, the metal support 4 and the metal shielding cover 3 are all arranged on the circuit board 6, and the circuit board 6 is fixedly arranged on the shell; the inner side of the metal support 4 is attached with a piezoelectric ceramic piece; the metal shielding case 3 is arranged outside the metal bracket 4 and realizes the function of isolating partial interference signals through grounding; the metal shielding cover and the shell thereof are correspondingly provided with windows as detection areas at the positions of the induction metal sheets 5; through the net gape 7 that electrostatic sensor device both ends set up, can pass through the detected signal net gape 7 uploads the host computer.
In one embodiment, the metal shielding case 3 is welded on the circuit board 6, the circuit board 6 is fixed on the shell in a limiting mode, the upper shell and the lower shell are fixed through buckles, and finally the upper shell and the lower shell are locked through screws; the metal bracket 4 is soldered on the circuit board 6, and the induction metal piece 5 is soldered on the circuit board.
The shell of the static electricity detection equipment is made of a conductor or a semiconductor. This electrostatic detection equipment uses the design of two net gapes, and net gape 7 is located the both ends of product, so alright with the tandem product, reduce the repetitive work volume that the wiring brought.
The circuit board 6 and the piezoelectric ceramics are connected through a metal object.
In the prior art, the static electricity is detected in a vibration capacitance mode generally, and the piezoelectric ceramic is used as a vibration source, so that the size of the static electricity detection device is further reduced, and application scenes are increased.
Preferably, the piezoelectric ceramic sheet is lead titanate, barium titanate-lead titanate, lead zirconate titanate.
Further preferably, the thickness of the piezoelectric ceramic piece is 0-17 mm, the length is 1.5-74 mm, and the width is 0.01-65 mm.
Preferably, the resonant frequency of the piezoelectric ceramic sheet material is 5 KHz-500 KHz, the anti-resonant frequency is 5 KHz-500 KHz, the electromechanical coupling coefficient is 0.001-10, and the capacitance is 5 pf-20 uf.
According to the invention, the piezoelectric ceramic piece in the resonant frequency range is selected, and only the frequency characteristic in the range needs to be extracted, so that the accuracy of electrostatic detection is improved.
The piezoelectric ceramics are attached and installed on the metal sheet forming the metal support 4, the circuit board 6 and the piezoelectric ceramics are connected by using metal objects, and the metal material is preferably gold, silver or copper.
The sensing metal sheet 5 is a vibratable metal sheet. When the potential signal of the body to be measured is driven by the oscillation signal of the oscillator, the capacitance electrode between the probe electrode and the body to be measured changes periodically, and the body to be measured induces a periodically changing alternating signal on the induction metal sheet, so that the direct current signal is converted into the alternating signal.
The static electricity detection device is provided with a window near the vibrating induction metal sheet 5, and the metal shielding cover and the shell thereof are also provided with windows at corresponding positions so as to be used as a detection area. The vibration of the sensing metal piece 5 may use piezoelectric ceramics as a vibration source.
A grounded metal shield can be added to the outside of the metal support 4 to isolate a portion of the interfering signal. The wrapping range of the metal shielding case 3 is as follows: the thickness of the metal shielding case 3 is 2.5-6.5mm, and the distance between the metal shielding case and the metal sheet is 20-45 mm.
Preferably, the signal can be further fed back to the metal shielding case 3 through the auxiliary power supply, and when the metal shielding case 3 and the measured object have the same potential, the gap discharge between the induction metal sheet and the electrode medium of the measured object can be further inhibited. The shielding loop reduces the absolute dependence degree on the metal sheet to a certain extent, and can ensure the stability and accuracy of measurement.
The metal holder 4 may be formed by two metal sheets connected in an arch-shaped manner. The metal holder 4 can also be formed by two separate metal sheets placed side by side.
The dimensions of the metal sheet can be specifically as follows: the spacing between the metal sheets is less than 80mm, and the metal sheets are connected with each other by a part of the metal sheets. The thickness of the metal sheet is 0.01 mm-20 mm, the length is less than 100mm, and the width is less than 80 mm. The height between the metal sheet and the circuit board 6 is 0.1 mm-100 mm.
Between the two metal sheets is arranged a sensing metal sheet 5 for sensing. The smaller the area of the sensing metal sheet 5, the higher the resolution, but the smaller the area, the lower the sensitivity of the measurement. It is therefore desirable to minimize the area of the sensing plate 5 as sensitivity allows. The distance between the measured body and the sensor is also related, the measuring distance is different, the measuring range is different, and the deviation of the measuring result is great after a certain distance is exceeded.
Preferably, the shape of the sensing metal sheet 5 is square, and the area is from 0.5mm to 63 cm.
More preferably, the sensing metal sheet 5 has a thickness of 0.01mm to 17mm, a length of 12 mm to 73mm, and a width of 7mm to 65 mm.
The induction metal sheet 5 is made of gold, silver or a metal material with high copper conductivity.
Preferably, the height between the sensing metal sheet 5 and the circuit board 6 is 3-67 mm.
Wherein, the thickness of the metal shielding case is preferably 0.6-6.5mm, and the distance between the metal shielding case and the induction metal sheet 5 is preferably 1.6-43 mm.
The shell of the static electricity detection device is made of a conductor or a semiconductor material.
The net port of the static electricity detection device is an RS-485 or lora/lorawan interface. The upper computer can adjust the static detection equipment through the network port, and the adjustment comprises zero calibration and calibration.
The static electricity detection device can remind an operator whether the machine is in a normal state or not in an audible and visual alarm mode, and when the machine is normal, green is displayed, when the machine is close to abnormal, yellow is displayed, and when the machine is abnormal, a red three-level alarm signal is displayed.
Referring to fig. 3-4, the specific circuit is depicted as:
when the vibratable sensing metal sheet senses the body potential signal to be measured, the body potential signal to be measured is driven by the oscillation signal of the oscillator to generate periodic variation between the sensing metal sheet and the body to be measured, and the body to be measured senses a periodically varying alternating signal on the sensing metal sheet, so that the direct current signal is converted into the alternating signal.
The induction metal sheet performs periodic mechanical motion according to a sine rule, and current changing according to the sine rule can be detected. The amplitude of the current is proportional to the potential of the electrostatic charge generated by the surface charge of the charged object, and the phase of the current represents the polarity of the measured object. After the modulation current is converted, positive current or negative current can be obtained, and the magnitude of the positive current or the negative current is in direct proportion to the electrostatic field, so that the current value can be converted into a voltage value by connecting a resistor.
The alternating signal is output as a direct current signal through subsequent circuits such as amplification, integration, filtering and the like.
Furthermore, after converting the charge signal into a weak voltage signal, the resulting voltage signal is too weak and susceptible to interference. The signal needs to be amplified to obtain the required stable signal, but the output impedance of the obtained signal is higher, so that a corresponding circuit needs to be designed for signal buffering, and the voltage follower can be used for improving the input impedance and reducing the input capacitance.
As shown in fig. 3, the circuit includes a voltage follower module and a pre-amplifier module. Specifically, the SIGNAL INPUT is INPUT to the high-precision operational amplifier, and the SIG2 SIGNAL is output as an output SIGNAL.
The voltage follower module can serve two functions: 1. the input impedance is improved, and the input capacitance is reduced. 2. And (4) isolating. The preceding stage and the power amplifier can be set separately, thereby reducing the influence of negative feedback on the input signal.
After the above amplification and interference signal processing, the filtering is still insufficient and needs to be performed again. The filtering uses second-order low-pass filtering, and the filtering adopts an RC filtering circuit, so that the filtered circuit is smoother.
As shown in fig. 4, through the resonant frequency range of the piezoelectric ceramic plate, we only need to extract the frequency characteristics in the range, and the rest of the frequencies need to be suppressed by arranging a special filter circuit.
The filter circuit shown in fig. 4, which uses an active filter signal and an operational amplifier as a core, does not affect the filtering characteristics of the circuit when the load changes. The basic order can be improved, the transition frequency band is narrowed, and the attenuation is accelerated by arranging at least two RC links.
In addition, the static electricity detection device further uses a dial switch to set the precision and the range of the machine.
It should be emphasized that the embodiments described herein are exemplary rather than limiting, and thus the present invention is not limited to the embodiments described in the detailed description, as other embodiments derived from the technical solutions of the present invention by those skilled in the art also belong to the protection scope of the present invention.
Claims (14)
1. An electrostatic detection apparatus, comprising:
the static electricity detection device comprises a shell, a metal shielding cover arranged in the shell, a metal bracket, induction metal sheets arranged in the metal bracket, a circuit board and net openings arranged at two ends of the static electricity detection device, wherein the induction metal sheets, the metal bracket and the metal shielding cover are all arranged on the circuit board, and the circuit board is fixedly arranged on the shell; the inner side of the metal bracket is attached with a piezoelectric ceramic piece; the metal shielding cover is arranged outside the metal bracket and realizes the function of isolating partial interference signals through grounding; the metal shielding cover and the shell thereof are correspondingly provided with windows as detection areas at the positions of the metal induction sheets; through the net gape that electrostatic sensor device both ends set up, can pass through the detected signal the host computer is uploaded to the net gape.
2. The static electricity detection apparatus according to claim 1, wherein: the metal bracket is formed by two metal sheets connected in an arch mode.
3. The static electricity detection apparatus according to claim 1, wherein: the metal bracket is composed of two metal sheets which are separately arranged in parallel.
4. The static electricity detection apparatus according to any one of claims 2 to 3, wherein: the circuit board is connected with the piezoelectric ceramics through a metal object.
5. The static electricity detection apparatus according to claim 4, wherein: the piezoelectric ceramic sheet is lead titanate, barium titanate-lead titanate and lead zirconate titanate.
6. The static electricity detection apparatus according to claim 5, wherein: the thickness of the piezoelectric ceramic plate is 0-17 mm, the length of the piezoelectric ceramic plate is 1.5-74 mm, and the width of the piezoelectric ceramic plate is 0.01-65 mm.
7. The static electricity detection apparatus according to claim 6, wherein: the resonant frequency of the piezoelectric ceramic sheet material is 5 KHz-500 KHz, the anti-resonant frequency is 5 KHz-500 KHz, the electromechanical coupling coefficient is 0.001-10, and the capacitance is 5 pf-20 uf.
8. The static electricity detection apparatus according to claim 7, wherein: the shape of the induction metal sheet is square, and the area of the induction metal sheet is 0.5 mm-63 cm.
9. The static electricity detection apparatus according to claim 8, wherein: the thickness of the induction metal sheet is 0.01mm-17mm, the length is 12-73mm, and the width is 7-65 mm.
10. The static electricity detection apparatus according to claim 9, wherein: the induction metal sheet is made of metal with high conductivity coefficient of gold, silver or copper.
11. The static electricity detection apparatus according to claim 10, wherein: the height between the induction metal sheet and the circuit board is 3-67 mm.
12. The static electricity detection apparatus according to claim 11, wherein: the thickness of the metal shielding case is 0.6-6.5mm, and the distance between the metal shielding case and the metal sheet is 1.6-43 mm.
13. The static electricity detection apparatus according to claim 12, wherein: the shell is made of conductor or semiconductor materials.
14. The static electricity detection apparatus according to claim 13, wherein: the network port is an RS-485 or lora/lorawan interface.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111071283.5A CN113514710B (en) | 2021-09-14 | 2021-09-14 | Electrostatic detection device |
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| CN202111071283.5A CN113514710B (en) | 2021-09-14 | 2021-09-14 | Electrostatic detection device |
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| CN113514710A true CN113514710A (en) | 2021-10-19 |
| CN113514710B CN113514710B (en) | 2021-12-10 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114384334A (en) * | 2021-12-03 | 2022-04-22 | 深圳市中明科技股份有限公司 | Wireless transmission electrostatic field online monitoring device and wireless monitoring system |
| CN114527337A (en) * | 2022-01-14 | 2022-05-24 | 深圳市中明科技股份有限公司 | Non-contact electrostatic field detection sensing probe device and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114384334A (en) * | 2021-12-03 | 2022-04-22 | 深圳市中明科技股份有限公司 | Wireless transmission electrostatic field online monitoring device and wireless monitoring system |
| CN114527337A (en) * | 2022-01-14 | 2022-05-24 | 深圳市中明科技股份有限公司 | Non-contact electrostatic field detection sensing probe device and system |
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