CN202372578U - Online static monitoring sensor - Google Patents
Online static monitoring sensor Download PDFInfo
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- CN202372578U CN202372578U CN2011204631442U CN201120463144U CN202372578U CN 202372578 U CN202372578 U CN 202372578U CN 2011204631442 U CN2011204631442 U CN 2011204631442U CN 201120463144 U CN201120463144 U CN 201120463144U CN 202372578 U CN202372578 U CN 202372578U
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Abstract
The utility model discloses an online static monitoring sensor, belonging to the field of static monitoring. The online static monitoring sensor consists of an inductive metal surface, a shielding metal surface and an insulation sheet, wherein the inductive metal surface is fixed on one surface of the insulation sheet, and the other surface of the insulation sheet is fixed with the shielding metal surface; and the shielding metal surface of the static monitoring sensor is fixedly provided with a piezoelectric dual-crystal oscillator. The online static monitoring sensor has the characteristics of low driving voltage, low vibration frequency and large vibration amplitude, can pass through intrinsically safe anti-explosion authentication, can be used for carrying out online static detection and alarm in oil product and flammable and explosive gas storage and transformation places, fills up the blank of the current static monitoring field and has better linearity with regard to the final measured value because the inductive metal surface can obtain enough induction voltage and current.
Description
Technical field
The utility model belongs to the electrostatic monitoring field, especially relates to a kind of static on-line monitoring sensor.
Background technology
Modes such as friction between thunderbolt, the object, alternating current induction all can produce static; The static that does not import the earth can change or static electric field, and the metering system to static is divided into the static measurement mode of not having the machinery motion and the kinetic measurement mode that mechanical motion is arranged at present, no matter which kind of metering system; All adopt noncontact and keep the electrostatic induction face of safe enough distance to be used as the collection point of electrostatic induction electric charge; Static static measurement mode mainly is used for measuring changing electric field, if the net charge on the static face is invariable, then electric field is constant; Electric current from the sensitive surface to the amplifier can be very little; Even reaching pA level electric current, final measurement is very unstable, because the leakage current of air flow, air humidity and temperature and circuit all can bring very large influence to measurement result; Static static measurement mode now mainly is used for measuring changing electric field, can't measure basically for static electric field.
The electrostatic dynamic metering system; Traditional approach has motor-driven, solenoid-activated, and piezoelectric ceramic piece driving, tuning fork switch drive etc., motor-driven and solenoid-activated all need big electric current; Energy stored is far longer than the intrinsic safety type requirement of explosion proof of oil storage and transportation place electrostatic detection product in the inductance; In electrostatic transducer, constantly charge into inert gas and can reach the flame proof requirement,, need the space of an opening to introduce the sensitive surface of electric field line to sensor because kinetic measurement type electrostatic transducer can't be made a product that shell is airtight; Reach the flame proof requirement so need constantly charge into inert gas, this makes cost significantly increase.
The piezoelectric ceramic piece driving needs high voltage; Even reach 200V, even but high like this voltage, the amplitude that piezoelectric ceramic piece produced is still too little; Can't on the sensitive surface of electrostatic transducer, produce enough induced voltage and electric current; For the high pressure of 200V, even very little current drain also is difficult to accomplish the explosion-proof authentication of intrinsic safety type.Need survey crew to hold electrostatic voltmeter in the prior art, move this from afar and show the static face, move by moment and accomplish moment electrostatic potential measurement, this table must lean on auxiliary its of survey crew move, and can not accomplish online test constantly.
Therefore those skilled in the art are devoted to develop a kind of intrinsic safe explosion-proof type static on-line monitoring sensor that can online test constantly.
The utility model content
Because the above-mentioned defective of prior art, the utility model technical matters to be solved provides a kind of intrinsic safe explosion-proof type static on-line monitoring sensor that can online test constantly.
For realizing above-mentioned purpose, the utility model provides a kind of static on-line monitoring sensor, comprises discharge circuit, and the output terminal of said discharge circuit is connected with the input end of wave filter; The output terminal of said wave filter is connected with processor through comparer; The output terminal of said wave filter is connected with processor through the real effective converter; Also comprise the electrostatic induction device, said electrostatic induction device is made up of induction metal covering, shielded metal face and insulating trip; Said induction metal covering is fixed on the one side of insulating trip, the another side fixed mask metal covering of said insulating trip; Said induction metal covering is connected with the input end of discharge circuit; Said shielded metal face connects the earth; Said shielded metal face is fixed with the piezoelectric bimorph oscillator; The positive pole of said piezoelectric bimorph oscillator is connected with the positive pole of power circuit; The negative pole of said piezoelectric bimorph oscillator is connected with the negative pole of said power circuit; The signal end of said piezoelectric bimorph oscillator is connected with the output terminal of pulse driver; The input end of said pulse driver is connected with processor;
Said processor produces pulse signal and controls said pulse driver drive pressure electrical twining oscillator vibration; Said processor carries out the phase demodulation juggling with said processor pulse signal that produces and the signal that the induction metal covering returns, and the direct current signal that the real effective converter is sent to is carried out analog-to-digital conversion process;
Said power circuit is supplied power to static on-line monitoring sensor.
Preferable, said pulse driver is the isolated form pulse driver.
Preferable, said processor is connected with computing machine through the RS485 communication interface.
Preferable, said processor is connected with Temperature Humidity Sensor; Said Temperature Humidity Sensor converts temperature amount and humidity amount to electric signal and imports said processor into.
The beneficial effect of the utility model is: the processor gating pulse driver drives piezoelectric bimorph oscillator of the utility model drives the vibration of induction metal covering; Have the advantages that driving voltage is low, vibration frequency is low, Oscillation Amplitude is big; Can pass through the explosion-proof authentication of intrinsic safety type; Carry out online electrostatic detection and warning at oil product and flammable explosive gas accumulating place; Fill up the blank in this field at present, can access enough induced voltages and electric current on the induction metal covering, have the better linearity degree for final measured value.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model embodiment one.
Fig. 2 is the structural representation of electrostatic induction device.
Fig. 3 is the circuit theory diagrams of the utility model embodiment two.
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
Embodiment one: like Fig. 1, shown in Figure 2, a kind of static on-line monitoring sensor comprises discharge circuit 1, and the output terminal of discharge circuit 1 is connected with the input end of wave filter 2; The output terminal of wave filter 2 is connected with processor 4 through comparer 3; The output terminal of wave filter 2 is connected with processor 4 through real effective converter 5; Also comprise electrostatic induction device 6, electrostatic induction device 6 is made up of induction metal covering 7, shielded metal face 8 and insulating trip 9, and induction metal covering 7 sticks on the one side of insulating trip 9; The another side of insulating trip 9 is pasted shielded metal face 8, and said induction metal covering 7 is connected with the input end of discharge circuit 1; Said shielded metal face 8 connects the earth; Said shielded metal face 8 is pasted with piezoelectric bimorph oscillator 10; The positive pole of piezoelectric bimorph oscillator 10 is connected with the positive pole of power circuit 11; The negative pole of piezoelectric bimorph oscillator 10 is connected with the negative pole of power circuit 11; The signal end of piezoelectric bimorph oscillator 10 is connected with the output terminal of pulse driver 12, and the input end of pulse driver 12 is connected with processor 4.
Said processor 4 produces pulse signal and controls 10 vibrations of said pulse driver 12 drive pressure electrical twining oscillators; Said processor 4 carries out the phase demodulation juggling with said processor 4 pulse signal that produces and the signal that induction metal covering 7 returns, and the direct current signal that the real effective converter is sent to is carried out analog-to-digital conversion process.
Said power circuit 11 is the 24V power supply; Processor 4 produces pulse signal gating pulse driver 12 and produces pulse voltage; This pulse voltage drive pressure electrical twining oscillator 10 produces vibration, thereby drives induction metal covering 7 vibrations that are connected with piezoelectric bimorph oscillator 10, therefore between static face and induction metal covering 7, forms an alternating electric field; Can obtain a sinusoidal damp type induced voltage on the induction metal covering 7; The amplitude of this sine damp type induced voltage is passed to wave filter 2 by behind 30 times of discharge circuit 1 linear amplification, and wave filter 2 is removed unnecessary interference noise signal, keeps useful signal; This useful signal is given comparer 3 for one group and is compared and enlarged processing; Give processor 4 at last and make phase demodulation and differentiate to calculate, it is the phase place of relatively responding to induction alternating voltage on the metal covering 7 and impose on the phase place of piezoelectric bimorph oscillator pulse voltage that phase demodulation is differentiated the processing mode of calculating, thereby can judge that it is just or negative that the static face is attend institute's static electrification; Another group signal is given real effective converter 5; Real effective converter 5 is transformed into direct current signal to AC signal; And then give processor 4 and make digital quantification treatment, 4 pairs of conversion values of processor carry out digital filtering, thereby obtain comparatively accurate electrostatic measurement value through calculating.
Present embodiment pulse driver 12 is the isolated form pulse driver; Present embodiment wave filter 2 is a second order Sallen-Key low-pass filter; Induction metal covering 7 also can be bundled on the insulating trip 9; Shielded metal face 8 also can be bundled on the insulating trip, and piezoelectric bimorph oscillator 10 also can be bundled on the shielded metal face 8, and piezoelectric bimorph oscillator 10 also can be pasted and be bundled on the shielded metal face 8.
Embodiment two: as shown in Figure 3, the structure of present embodiment and embodiment 1 are basic identical, and different is: processor 4 is connected with computing machine through RS485 communication interface 13, and processor 4 is connected with Temperature Humidity Sensor 14; Temperature Humidity Sensor 14 converts temperature amount and humidity amount to electric signal and imports processor 4 into.
More than describe the preferred embodiment of the utility model in detail.Should be appreciated that those of ordinary skill in the art need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technician in the art according to the design of the utility model on the basis of existing technology through the available technical scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection domain by claims.
Claims (4)
1. a static on-line monitoring sensor comprises discharge circuit (1), and the output terminal of said discharge circuit (1) is connected with the input end of wave filter (2); The output terminal of said wave filter (2) is connected with processor (4) through comparer (3); The output terminal of said wave filter (2) is connected with processor (4) through real effective converter (5); It is characterized in that: also comprise electrostatic induction device (6), said electrostatic induction device (6) is made up of induction metal covering (7), shielded metal face (8) and insulating trip (9); Said induction metal covering (7) is fixed on the one side of insulating trip (9), the another side fixed mask metal covering (8) of said insulating trip (9); Said induction metal covering (7) is connected with the input end of discharge circuit (1); Said shielded metal face (8) connects the earth; Said shielded metal face (8) is fixed with piezoelectric bimorph oscillator (10); The positive pole of said piezoelectric bimorph oscillator (10) is connected with the positive pole of power circuit (11); The negative pole of said piezoelectric bimorph oscillator (10) is connected with the negative pole of said power circuit (11); The signal end of said piezoelectric bimorph oscillator (10) is connected with the output terminal of pulse driver (12); The input end of said pulse driver (12) is connected with processor (4);
Said processor (4) produces pulse signal and controls said pulse driver (12) drive pressure electrical twining oscillator (10) vibration; Said processor (4) carries out the phase demodulation juggling with said processor (4) pulse signal that produces and the signal that induction metal covering (7) returns, and the direct current signal that the real effective converter is sent to is carried out analog-to-digital conversion process;
Said power circuit (11) is supplied power to static on-line monitoring sensor.
2. static on-line monitoring sensor as claimed in claim 1 is characterized in that: said pulse driver (12) is the isolated form pulse driver.
3. according to claim 1 or claim 2 static on-line monitoring sensor, it is characterized in that: said processor (4) is connected with computing machine through RS485 communication interface (13).
4. static on-line monitoring sensor as claimed in claim 3 is characterized in that: said processor (4) is connected with Temperature Humidity Sensor (14); Said Temperature Humidity Sensor (14) converts temperature amount and humidity amount to electric signal and imports said processor (4) into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204631442U CN202372578U (en) | 2011-11-21 | 2011-11-21 | Online static monitoring sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204631442U CN202372578U (en) | 2011-11-21 | 2011-11-21 | Online static monitoring sensor |
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| Publication Number | Publication Date |
|---|---|
| CN202372578U true CN202372578U (en) | 2012-08-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204631442U Expired - Lifetime CN202372578U (en) | 2011-11-21 | 2011-11-21 | Online static monitoring sensor |
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| CN (1) | CN202372578U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508050A (en) * | 2011-11-21 | 2012-06-20 | 重庆工业自动化仪表研究所 | Instrument for measuring static electricity on line |
| CN106291143A (en) * | 2016-07-18 | 2017-01-04 | 北京东方计量测试研究所 | Electrostatic potential monitoring device and method |
| CN107329004A (en) * | 2016-12-02 | 2017-11-07 | 北京理工大学 | A kind of contactless MEMS autoexcitations stilling the theatre electrical resistivity survey examining system and its detection method based on electrostatic induction principle |
| CN111122991A (en) * | 2019-12-30 | 2020-05-08 | 上海安平静电科技有限公司 | Method for judging whether electrostatic sensor works normally |
-
2011
- 2011-11-21 CN CN2011204631442U patent/CN202372578U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102508050A (en) * | 2011-11-21 | 2012-06-20 | 重庆工业自动化仪表研究所 | Instrument for measuring static electricity on line |
| CN102508050B (en) * | 2011-11-21 | 2014-08-13 | 重庆工业自动化仪表研究所 | Instrument for measuring static electricity on line |
| CN106291143A (en) * | 2016-07-18 | 2017-01-04 | 北京东方计量测试研究所 | Electrostatic potential monitoring device and method |
| CN106291143B (en) * | 2016-07-18 | 2021-03-19 | 北京东方计量测试研究所 | Electrostatic potential monitoring device and method |
| CN107329004A (en) * | 2016-12-02 | 2017-11-07 | 北京理工大学 | A kind of contactless MEMS autoexcitations stilling the theatre electrical resistivity survey examining system and its detection method based on electrostatic induction principle |
| CN111122991A (en) * | 2019-12-30 | 2020-05-08 | 上海安平静电科技有限公司 | Method for judging whether electrostatic sensor works normally |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120808 |
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| CX01 | Expiry of patent term |