CN209486193U - A kind of electrostatic sensing detection head - Google Patents
A kind of electrostatic sensing detection head Download PDFInfo
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- CN209486193U CN209486193U CN201822240316.4U CN201822240316U CN209486193U CN 209486193 U CN209486193 U CN 209486193U CN 201822240316 U CN201822240316 U CN 201822240316U CN 209486193 U CN209486193 U CN 209486193U
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Abstract
A kind of electrostatic transducer belongs to electrostatic detection field.Shell including electrostatic sensing detection head；Its shell is a hollow metal cavity, and cavity one end is provided with the closure nut cap of electric charge induction window, and wiring board card slot is arranged in metal cavity inner wall；Wiring board is set in assist side card slot；Setting sensing bracket and electric charge induction piece in the circuit board；The cross section for sensing bracket is character "door" form structure；The setting corresponding with the position of charge induction window in shielding plugging nut cap of electric charge induction piece；The front end middle position of two longitudinal long sides is arranged in electric charge induction piece；It is respectively corresponded on two longitudinal stiles of sensing bracket and is provided with piezoelectric ceramic piece.Its interference that can effectively prevent outer bound pair electrostatic transducing signal；It fundamentally solves the problems, such as the quantitative detection of electrostatic, improves the precision and stability of electrostatic detection；Assembling procedure is simple, it is not easy to malfunction, help to ensure that the product qualification rate of electrostatic transducer.It can be widely used for the design and manufacture field of electrostatic transducer.
Description
Technical field
The utility model belongs to electrostatic detection field more particularly to a kind of electrostatic sensing detection for electrostatic detection fills
It sets.
Background technique
Electrostatic phenomenon be charge generation and disappearance during the general name of electrical phenomena that generates.
In actual operation, purpose electrostatic detected, mainly include the following types:
1. providing data and foundation for electrostatic protection engineering design and improvement product itself antistatic property design.
2. judging whether human body, equipment, machine equipment etc. are likely to become static discharge harm under actual motion condition
Source.
3. detecting the performance and quality of electrostatic protection equipment (utensil, tool, equipment, material).
4. evaluating the effect of electrostatic protection measure.
During practical electrostatic detection, electrostatic testing apparatus must be used.In electrostatic testing apparatus, usually all set
It is equipped with an electrostatic transducer (being commonly called as electrostatic sensing detection head).
Existing common electrostatic testing apparatus mainly applies Faraday cup electrostatic induction principle, is made into flat non-contact
Type electrostatic induction sensor, the weak voltage that will be sensed on sensor, by operation amplifier, in terminal number screen display,
So as to people's reading.
Tablet type sensor has an important feature, is exactly capacitance change very little, and only several PF, this feature makes its pole
Vulnerable to external interference, though parallel sensor can improve capacitance change, parasitic capacitance remains to influence variable quantity, parasitic when serious
Capacitor is much larger than this body capacitance, floods useful signal by parasitic capacity noise, so that sensor can not work.These parasitic electricity
Hold and changes and change with factors such as the performances of temperature, humidity, position and component.Therefore, it measures often not smart enough when electrostatic
Really.
In addition, existing board-like quiet detection table is in actual use, error is larger, and repeating detection consistency cannot be guaranteed,
Such electrostatic detection table uses that there is no problem as qualitative detection, as quantitative analysis detection using then undertaking to do what is apparently beyond one's ability.
Utility model content
The technical problem to be solved by the utility model is to provide a kind of electrostatic sensing detection heads.Its electrostatic sensing detection head
Shell, using metal material constitute a hollow shielding cavity, can effectively prevent the interference of outer bound pair electrostatic transducing signal；
Supporting structure is sensed using door shape, by way of making two that sense bracket longitudinal stiles carry out mechanical oscillation, will be felt
The electrostatic potential that should be arrived is changed into alternating voltage, uses for output and subsequent detection/amplifying unit, fundamentally solves electrostatic
Quantitative detection problem, and monitoring data subsequent amplification/processing be easy, the favorable repeatability of detection data improves electrostatic
The precision and stability of detection.
The technical solution of the utility model is: providing a kind of electrostatic sensing detection head, the shell including electrostatic sensing detection head
Body；It is characterized in that:
The shell is a hollow metal cavity, and one end of cavity is provided with the capping of electric charge induction window
Cap, the other end are provided with back shroud；
In the inner wall of metal cavity, it is provided with wiring board card slot；
Wiring board is provided in assist side card slot；
It is provided with sensing bracket and electric charge induction piece in the circuit board；
The cross section of the sensing bracket is character "door" form structure, is made of two longitudinal stiles and a top horizontal edge；
The position of the electric charge induction piece, it is corresponding with the position of charge induction window in shielding plugging nut cap, with wiring board
It is vertically arranged；
The front end middle position of two longitudinal long sides is arranged in the electric charge induction piece；
On two longitudinal stiles of the sensing bracket, respectively corresponds and be provided with piezoelectric ceramic piece.
Specifically, the cross section of the metal cavity is rectangular or cylindrical.
It is provided with screw thread between nut cap and metal cavity described in it to be screwed on structure, the nut cap and metal cavity are through spiral shell
The line structure that is screwed on is fixed as one.
It is fixed by screws and is integrated between back shroud and metal cavity described in it.
Further, it is respectively corresponded on described two longitudinal stiles and is provided with a piezoelectric ceramic piece；Two piezoelectricity potteries
The size of tile is 10 × 3.2mm, and capacitance is 5-6nF.
The width of its electric charge induction piece receiving plane, less than between two longitudinal stiles of sensing bracket character "door" form structure
Spacing.
The piezoelectric ceramic piece and electric charge induction piece is correspondingly connected with electrostatic sensing support circuitry respectively.
Further, electrostatic sensing support circuitry includes zener diode Z1 to Z6, resistance R1 and field-effect tube
G1；
Wherein, the plus earth of zener diode Z3, Z4, cathode connect with the first piezoelectric ceramic piece being located on sensing bracket
It connects, constitutes the first input end R of electrostatic sensing support circuitry；
The plus earth of zener diode Z5, Z6, cathode are connect with the second piezoelectric ceramic piece being located on sensing bracket, structure
At the second input terminal T of electrostatic sensing support circuitry；
One end of resistance R1 is grounded, and the other end is connect with the electric charge induction piece J on wiring board；
Electric charge induction piece J connection in the grid G and wiring board of field-effect tube G1；
The drain D of field-effect tube G1 constitutes the output end Q of sensing driving unit；
The source S of field-effect tube G1 is grounded；
The plus earth of zener diode Z1, Z2, cathode are connect with the drain D of field-effect tube G1.
The surface of the piezoelectric ceramic piece is provided with three proofings paint layer.
The surface of the sensing bracket is provided with Gold plated Layer.
Compared with the prior art, the utility model has the advantages that:
1. making to sense two, bracket longitudinal stiles generation oscillation crosswises by piezoelectric ceramics, is formed and be similar to tuning fork vibration
Action mode, electrostatic potential is changed into alternating voltage by way of mechanical oscillation, fundamentally solves determining for electrostatic
Test problems are measured, the subsequent processes of data is facilitated, improves the stability of electrostatic detection precision and measurement data；
2. using tuning fork vibration mode, the frequency of two longitudinal stile vibrations is controllable and sufficiently stable, is conducive to electrostatic inspection
Repeatability/reproducible degree of the Stability and veracity of measured data, detection data is good；
3. after electrostatic signal is changed into alternating signal, the subsequent processes or processing circuit for detecting signal are able to significantly
Simplify and is easy to implement；
4. electric charge induction window to be arranged in one end of electrostatic sensing detection casing, and electric charge induction piece is vertical with wiring board
Setting, is arranged the shell of electrostatic sensing detection head horizontally or laterally, facilitates the whole knot of entire electrostatic detection head
Structure and layout save vertical mounting height, adapt to the installation site of relatively narrower, facilitate extend electrostatic testing apparatus can
Use/mountable range；
5. wiring board card slot is arranged in the inside of electrostatic sensing detection casing, be conducive to the fixation and raising group of wiring board
Speed is filled, ensures assembling quality；
6. its shielding cavity is metal material, the interference of outer bound pair electrostatic transducing signal can effectively prevent.
Detailed description of the invention
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is the A-A ' of Fig. 1 to cross section structure schematic diagram；
Fig. 3 is the structural schematic diagram of the utility model electric charge induction piece；
Fig. 4 is the structural schematic diagram sensed after bracket expansion；
Fig. 5 is the overlooking structure diagram for sensing bracket and wiring board；
Fig. 6 is the side structure schematic view of Fig. 5；
Fig. 7 is the B of Fig. 5 to structural schematic diagram；
Fig. 8 is the C of Fig. 5 to structural schematic diagram；
Fig. 9 is the electrical schematic diagram of electrostatic sensing support circuitry.
Wherein, 1 is metal cavity, and 2 be electric charge induction window, and 3 is block nut cap, and 4 be back shroud, and 5 be wiring board card slot, 6
It is sensing bracket for wiring board, 7,7-1,7-2 are two longitudinal stiles for sensing bracket, and 7-3 is the top horizontal edge for sensing bracket,
8 be electric charge induction piece, and 8a is electric charge induction piece receiving plane, and 8b is the leg of electric charge induction piece, and 9a is the first piezoelectric ceramic piece, 9b
For the second piezoelectric ceramic piece.
Specific embodiment
The utility model is described further with reference to the accompanying drawings and examples.
In Fig. 1, Fig. 2, the technical solution of the utility model provides a kind of electrostatic sensing detection head, including electrostatic sensing
The shell of detector；What it was invented is:
The shell is a hollow metal cavity 1, and one end of cavity is provided with the capping of electric charge induction window 2
Cap 3, the other end are provided with back shroud 4.
The cross section of metal cavity is rectangular or cylindrical in the technical program (in attached drawing by taking cylinder as an example).
In the inner wall of metal cavity, it is provided with wiring board card slot 5.
Wiring board 6 is provided in assist side card slot.
It is provided with sensing bracket 7 and electric charge induction piece 8 in the circuit board.
The cross section of the sensing bracket is character "door" form structure, by two longitudinal direction stile 7-1,7-2 and biography of sensing bracket
The top horizontal edge 7-3 of sensing rack is constituted.
The position of the electric charge induction piece, it is corresponding with the position of charge induction window in shielding plugging nut cap；The charge
Sensing chip is vertically arranged with wiring board.
The shell of electrostatic sensing detection head in the technical program constitutes a hollow shielding cavity using metal material,
It can effectively prevent the interference of outer bound pair electrostatic transducing signal.
The front end middle position of two longitudinal long sides is arranged in the electric charge induction piece；
On two longitudinal stiles of the sensing bracket, respectively corresponds and be provided with the pressure of the first piezoelectric ceramic piece 9a and second
Electroceramics piece 9b.
Sensing bracket and electric charge induction piece weld in the circuit board.
It it is provided with screw thread between nut cap and metal cavity is screwed on structure blocking, block nut cap and metal cavity is revolved through screw thread
Binding structure is fixed as one.
It is fixed by screws and is integrated between the back shroud and metal cavity.
In Fig. 3, electric charge induction piece is by electric charge induction piece receiving plane 8a and the electric charge induction piece for welding with wiring board
Leg 8b is constituted.
It is the holohedral symmetry of a H-shaped it is found that sensing bracket is launched into the structure after a plane as shown in Fig. 4 to Fig. 8
Structure, two long sides of H-shaped full symmetrical configuration constitute two longitudinal directions of character "door" form structure after the opposite bending of dotted line in Fig. 4
Stile 7-1,7-2；Short side among H-shaped structure constitutes the top horizontal edge 7-3 of character "door" form structure.
On sensing two of bracket longitudinal stile 7-1,7-2, respectively corresponds and be provided with the first piezoelectric ceramic piece 9a and the
Two piezoelectric ceramic piece 9b；The size of two piezoelectric ceramic pieces is 10 × 3.2mm, and capacitance is 5-6nF；Such structure and ginseng
Numerical value can make the electrostatic signal effect detected clear, reliable；In turn, ensure that equal positive and negative of detected electrostatic pressure amplitude
Electrostatic signal, it is in the same size, numerical value is accurate.
It is fixed between piezoelectric ceramic piece and sensing bracket using fixed glue sticking.
In the technical program, the material for sensing bracket is phosphor-copper or beryllium copper, and the surface of sensing bracket is provided with Gold plated Layer,
To prevent the oxidation of sensing bracket.
It is found that in the technical scheme, electric charge induction piece is for receiving extraneous static lotus as shown in Fig. 3 and Fig. 6 to Fig. 8
The actuating signal of generation；The width of the electric charge induction piece receiving plane 8a of electric charge induction piece, less than sensing bracket character "door" form structure
Spacing between two longitudinal stile 7-1,7-2, to ensure easily to detect effect clearly apparent electrostatic signal.
The surface of piezoelectric ceramic piece is provided with three proofings paint layer, to prevent the surface oxidation of piezoelectric ceramic piece, influences capacitor
It is worth and then influences the accuracy of detection signal.
Piezoelectric ceramic piece and electric charge induction piece in the technical program are correspondingly connected with electrostatic sensing support circuitry respectively.
In Fig. 9, the electrostatic in the technical program senses support circuitry, including zener diode Z1 to Z6, resistance R1 and field
Effect pipe G1；Wherein, the plus earth of zener diode Z3, Z4, cathode and the first piezoelectric ceramic piece being located on sensing bracket
9a connection constitutes the first input end R of electrostatic sensing support circuitry；
The plus earth of zener diode Z5, Z6, cathode are connect with the second piezoelectric ceramic piece 9b being located on sensing bracket,
Constitute the second input terminal T of electrostatic sensing support circuitry；
One end of resistance R1 is grounded, and the other end is connect with the electric charge induction piece on wiring board；
Electric charge induction piece 8 in the grid G and wiring board of field-effect tube G1 connects；
The drain D of field-effect tube G1 constitutes the output end Q of sensing driving unit；
The source S of field-effect tube G1 is grounded；
The plus earth of zener diode Z1, Z2, cathode are connect with the drain D of field-effect tube G1.
The effect of resistance R1 in Fig. 9 is that extraneous static signal is made to form a voltage value, then with field-effect tube G1
(2SK2219) is amplified, and then carries out detection, enhanced processing by subsequent transducing signal processing unit again.
When actual implementation the technical program, the wiring board of sensing bracket and electric charge induction piece will be welded, be inserted into wire chamber
In wiring board card slot on internal wall, closure nut cap is screwed, back shroud is installed, can be assembled quiet described in the technical program
Fax sense detector.
By using above-mentioned technical proposal, electrostatic transducer described in the utility model can effectively prevent outer bound pair electrostatic
The interference of transducing signal；Fundamentally solves the problems, such as the quantitative detection of electrostatic, and the subsequent amplification of monitoring data/processing is held
Easily, the favorable repeatability of detection data improves the precision and stability of electrostatic detection；Assembling procedure is simple, it is not easy to it malfunctions,
Help to ensure that the product qualification rate of electrostatic transducer.
The utility model can be widely used for the design and manufacture field of electrostatic transducer.
Claims (10)
1. a kind of electrostatic sensing detection head, the shell including electrostatic sensing detection head；It is characterized in that:
The shell is a hollow metal cavity, and one end of cavity is provided with the closure nut cap of electric charge induction window, separately
One end is provided with back shroud；
In the inner wall of metal cavity, it is provided with wiring board card slot；
Wiring board is provided in assist side card slot；
It is provided with sensing bracket and electric charge induction piece in the circuit board；
The cross section of the sensing bracket is character "door" form structure, is made of two longitudinal stiles and a top horizontal edge；
The position of the electric charge induction piece, it is corresponding with the position of charge induction window in shielding plugging nut cap, it is vertical with wiring board
Setting；
The front end middle position of two longitudinal long sides is arranged in the electric charge induction piece；
On two longitudinal stiles of the sensing bracket, respectively corresponds and be provided with piezoelectric ceramic piece.
2. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that the cross section of the metal cavity be rectangle or
It is cylindrical.
3. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that being arranged between the nut cap and metal cavity
There is be screwed on structure, the nut cap and metal cavity of screw thread to be fixed as one through the screw thread structure that is screwed on.
4. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that leading between the back shroud and metal cavity
Screw is crossed to be connected to one.
5. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that being respectively corresponded on described two longitudinal stiles
It is provided with a piezoelectric ceramic piece；The size of two piezoelectric ceramic pieces is 10 × 3.2mm, and capacitance is 5-6nF.
6. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that the width of the electric charge induction piece receiving plane, small
Spacing between two longitudinal stiles of sensing bracket character "door" form structure.
7. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that the piezoelectric ceramic piece and electric charge induction piece
It is correspondingly connected with respectively with electrostatic sensing support circuitry.
8. electrostatic sensing detection head according to claim 7, it is characterized in that the electrostatic sensing support circuitry includes steady
Press diode Z1 to Z6, resistance R1 and field-effect tube G1；
Wherein, the plus earth of zener diode Z3, Z4, cathode are connect with the first piezoelectric ceramic piece being located on sensing bracket,
Constitute the first input end R of electrostatic sensing support circuitry；
The plus earth of zener diode Z5, Z6, cathode connect with the second piezoelectric ceramic piece being located on sensing bracket, constitute quiet
Second input terminal T of fax sensing rack circuit；
One end of resistance R1 is grounded, and the other end is connect with the electric charge induction piece on wiring board；
Electric charge induction piece J connection in the grid G and wiring board of field-effect tube G1；
The drain D of field-effect tube G1 constitutes the output end Q of sensing driving unit；
The source S of field-effect tube G1 is grounded；
The plus earth of zener diode Z1, Z2, cathode are connect with the drain D of field-effect tube G1.
9. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that being provided on the surface of the piezoelectric ceramic piece
Three proofings paint layer.
10. electrostatic sensing detection head described in accordance with the claim 1, it is characterized in that being provided with plating on the surface of the sensing bracket
Layer gold.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822240316.4U CN209486193U (en) | 2018-12-27 | 2018-12-27 | A kind of electrostatic sensing detection head |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822240316.4U CN209486193U (en) | 2018-12-27 | 2018-12-27 | A kind of electrostatic sensing detection head |
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| Publication Number | Publication Date |
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| CN209486193U true CN209486193U (en) | 2019-10-11 |
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ID=68129143
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| CN201822240316.4U Active CN209486193U (en) | 2018-12-27 | 2018-12-27 | A kind of electrostatic sensing detection head |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527336A (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 |
| 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 |
-
2018
- 2018-12-27 CN CN201822240316.4U patent/CN209486193U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114527336A (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 |
| 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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