CN201376079Y - Anti-interference power enhancing and switching device of vortex flow transducer detection system - Google Patents
Anti-interference power enhancing and switching device of vortex flow transducer detection system Download PDFInfo
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- CN201376079Y CN201376079Y CN200920068757U CN200920068757U CN201376079Y CN 201376079 Y CN201376079 Y CN 201376079Y CN 200920068757 U CN200920068757 U CN 200920068757U CN 200920068757 U CN200920068757 U CN 200920068757U CN 201376079 Y CN201376079 Y CN 201376079Y
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- eddy current
- current sensor
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Abstract
The utility model relates to an anti-interference power enhancing and switching device of a vortex flow transducer detection system, which solves the problem that the vortex flow transducer detection system is interfered by other electric heating devices when in running. The anti-interference power enhancing and switching device is arranged between a pre-amplifier and a centre counting unit of the existing vortex flow transducer detection system and comprises a power amplifier module and a driving switcher, wherein the power amplifier module comprises a gain controller, a phase controller and a power amplifier; the gain controller is connected with a driving signal output end, the phase controller is connected with the gain controller, and the power amplifier is connected with the phase controller; the driving switcher is a selector switch component, the two switching ends of the driving switcher are respectively connected with the driving signal output end of the centre counting unit and the output end of the power amplifier module, and the output end of the driving switcher is connected with a driving signal input end of the pre-amplifier unit. The anti-interference power enhancing and switching device can enhance the driving signal of a vortex flow transducer and increase the signal-to-noise ratio of the vortex flow transducer, therefore, the affection of external interference can be reduced greatly, and the device can keep the original signal unchanged when suppressing the interference.
Description
Technical field
The utility model relates to a kind of instrument and meter for automation, refers in particular to the anti-interference power that uses in a kind of eddy current sensor detection system and strengthens and switching device shifter.
Background technology
Eddy current sensor is the employed device of corresponding eddy nondestructive testing method in the five big conventional lossless detection methods (eddy current, ultrasonic, magnetic, ray, infiltration), also be widely used a kind of checkout gear in the metallurgy industry, be mainly used in position measurement in the steel sheet production line, defectoscopy etc.
Eddy current sensor has that reaction speed is fast, certainty of measurement is high, and can normally detect under the condition of high temperature, need not specific safety protection, advantage such as convenient for installation and maintenance during use, be widely used in steel each production line, wherein in the casting of continuous casting high temperature is produced, also be to use the vortex sensor measuring molten steel liquid level, it is to realize the molten steel liquid level key of control automatically in the continuous casting of iron and steel production process that the accurate measurement of Mold Steel Level detects, and also is a key factor that influences the finished product slab quality.When casting, around crystallizer, there is the high-power electronic device of used for various applications to use at the same time in order to satisfy the big needs of producing simultaneously again, as high-power molten steel plasma electric firing equipment, electrical equipment etc., cause the eddy electrons sensor disturbed, influenced control, technology and product quality and production direct motion.
Example, the eddy current liquid level sensor that has adopted Czech VUHZ company to produce in the level control loop of Baosteel two continuous castings detects molten steel liquid level, sometimes in order to produce needs, used the plasma apparatus of tundish heating simultaneously, its electronic equipment power is up to 2MW, and spatially the distance fork is nearer with eddy current sensor, as long as start the plasma apparatus of heating, will seriously disturb liquid level gauging, cause the interference upheaval that liquid level speed is fast, wave amplitude is big, molten steel liquid level is controlled inefficacy automatically.Had a strong impact on the normal casting production under this state.
The detection system structure of the eddy current sensor of above-mentioned VUHZ as shown in Figure 1, it comprises eddy current sensor (sensor probe) 1, preamplifier 2 and central computation unit 3.Eddy current sensor 1 and preamplifier 2 are installed in the scene, and central computation unit 3 is installed in the control room.At first central computation unit 3 provides the AC signal of a 813Hz/10Vrms, through pre-amplifier unit 2, drive the drive coil of eddy current sensor, the magnetic test coil of eddy current sensor 1 detects the variation of molten steel position, produce a very little 813Hz voltage signal, convert current signal to by preamplifier 2 and carry out long-distance transmissions, send central computation unit 3.Central computation unit 3 is calculated according to the amplitude and the phase place of signal, obtains liquid level signal, send DCS control system by the 4-20mA signal, carries out the accurately control automatically of liquid level loop.The output signal of central computation unit 3 is sent into the DCS control system 4 of production scene.
When using plasma apparatus to carry out the heating of tundish molten steel, the electric current that isoionic electric arc can produce induced voltage on the conductor around divergent electromagnetic radiation in aerial and the molten steel, alternating current by tundish can make, leak molten steel also can to around eddy current sensor 1 generation electromagnetic induction.The last bigger interference of meeting generation on the eddy current liquid level sensor, the frequency of interference has covered the operating frequency of sensor, so rely on the method for filtering can't eliminate the influence of interference fully merely.
In order to address the above problem, numerous disclosed technical schemes are arranged also in the industry at present:
1, " CN01822593.4, the method and apparatus of the forward power control in the communication system ".Introduced a kind of Poewr control method relevant with communication speed and device, it is not to reduce noise by special device hoisting power.
2, " CN02152236.7 is used to minimize the power amplifier clipping circuit of output distortion ".A kind of power amplifier clipping circuit that minimizes output distortion and high-frequency noise, the sudden change of output waveform when preventing to make the output waveform slicing by excessive input voltage.This device can not reduce external interference.
3，“US5425057，Phase?demodulation?method?and?apparatus?usingasynchronous?sampling?pulses”。Introduced a kind of implementation method of digital narrow band filter, it is a digital circuit, and non-analog circuit, anti-jamming circuit are very complicated.
In the above-mentioned disclosed technical scheme, owing to respectively its defective is arranged, existing interference problem in the time of can not really solving above-mentioned vortex sensor measuring molten steel liquid level.
The utility model content
The purpose of this utility model is in order to solve the problem that prior art exists, provide a kind of anti-interference power of eddy current sensor detection system to strengthen and switching device shifter, eddy current sensor can be driven signal strengthens, to improve the signal to noise ratio of eddy current sensor, the influence of external interference is reduced significantly, and can when suppressing interference, keep primary signal constant.
The purpose of this utility model is achieved through the following technical solutions:
A kind of anti-interference power of eddy current sensor detection system strengthens and switching device shifter, described eddy current sensor detection system comprises: the driving signal output part of central computation unit connects the driving signal input of pre-amplifier unit, and the driving signal output part of pre-amplifier unit connects the drive coil of eddy current sensor; The detection signal output of eddy current sensor connects the detection signal input of preamplifier; The detection signal output of preamplifier connects the detection signal input of central computation unit;
It is characterized in that:
The anti-interference power of also connecting between the driving signal output part of described central computation unit and the driving signal input of pre-amplifier unit strengthens and switching device shifter;
Described anti-interference power strengthens and switching device shifter is made up of power amplifier module and driving switch;
Described power amplifier module comprises: the fader that is connected with the driving signal output part of described central computation unit; The phase regulator that is connected with the output of fader; The power amplifier that is connected with the output of phase regulator;
Described driving switch is the change-over switch parts, it contains stiff end and two switch terminal, two switch terminal are connected with the driving signal output part of described central computation unit and the output of power amplifier module respectively, and stiff end connects the driving signal input of described pre-amplifier unit.
The beneficial effects of the utility model:
This device can drive eddy current sensor signal to be strengthened, and to improve the signal to noise ratio of eddy current sensor, the influence of external interference is reduced significantly.
Practical operation situation and analysis of experimental data from the continuous casting scene, use this device, can be under the situation of the high-power heating of plasma, original 15mm of eddy current liquid level sensor is more significantly disturbed the level that is reduced to 5mm, be able to the normal level of using.
This device not only can be used for eddy current sensor, also can be used for the occasion that other need eliminate interference, comprises communication, measurement, control etc.Its stability is high, can satisfy the strict demand of commercial measurement.
For further specifying above-mentioned purpose of the present utility model, design feature and effect, the utility model is elaborated below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the electric theory diagram of the eddy current sensor detection system of existing VUHZ for Fig. 1;
Fig. 2 is the electric theory diagram of eddy current sensor detection system of the present utility model;
Fig. 3 is anti-interference driving enhancing and the switching device shifter line assumption diagram in the utility model.
The specific embodiment
Accompanying drawing below in conjunction with embodiment is elaborated to the anti-interference power enhancing of eddy current sensor detection system of the present utility model and the specific embodiment of switching device shifter.
The application has proposed a kind of anti-interference driving enhancing and switching device shifter of eddy current sensor detection system, it is placed between existing eddy current sensor (containing preamplifier) and the central computation unit (secondary meter), improve the amplitude of sensor actuation signal by driver element, and carry out switching between anti-interference mode and the normal mode by switching device shifter.Because interference signal intensity immobilizes, thereby has suppressed interfering signal relatively,, adjust the amplitude of sensor detection signal by build-out resistor by the phase place that compensating circuit is regulated the sensor detection signal.Keep the amplitude and the phase information of useful signal constant so at the same time, just guarantee to have suppressed interference under the constant situation of sensor testing result.
Strengthen jamproof principle about signal:
As previously mentioned, for fixed-size interfering signal,, just reduce the influence of disturbing relatively if improve the intensity of sensor actuation signal.According to as follows:
1, for the eddy current sensor principle, satisfy following relation between the detection signal that driving signal that computing unit provides and sensor probe obtain:
S
Sen=aS
Drv(formula 1)
Wherein: S
SenFor sensor probe detects the signal that obtains, a is the sensitivity coefficient of sensor, S
DrvDriving signal for sensor.
2, the signal to noise ratio that drives between signal and the interfering signal satisfies following condition:
Wherein: R is a signal to noise ratio, S
NoiseBe interfering signal.
3, when the driving signal strengthened G times, signal to noise ratio satisfied following condition:
Wherein: R ' is the signal to noise ratio after strengthening, S '
SenBe the sensor detection signal after strengthening.
Hence one can see that, and after G times of driving signal enhancing, the signal to noise ratio of sensor has also improved G doubly, and the drive signal strength of therefore suitable raising sensor probe is highly beneficial to improving signal to noise ratio.
Automatically compensating the variation that drives gain about signal is described as follows.
For VUHZ eddy current liquid level sensor, it also has bucking coil except detecting the coil of liquid level, and it is used for the influence of compensated line to detection signal.
When the driving signal not being strengthened, magnetic test coil obtains signal S
Sen, bucking coil obtains signal S
Comp, its ratio is:
When the driving signal was strengthened G times, magnetic test coil obtained signal GS
Sen, bucking coil obtains signal GS
Comp, its ratio is:
That is to say that the signal of bucking coil is compensation automatically when driving the signal enhancing, the liquid level signal that sensor is obtained remains stable.Need not to carry out extra adjustment.
According to above-mentioned principle, the following structure of employing of the present utility model.
Referring to Fig. 2, Fig. 2 is the electric theory diagram of eddy current sensor detection system of the present utility model.
As shown in the figure, the technical solution of the utility model mainly is that the equipment of former installation and operation is motionless, after only the cable between eddy current sensor (containing preamplifier) and the central computation unit (secondary meter) being disconnected, between cut-off point, connect anti-interference power and strengthen and switching device shifter.
Eddy current sensor detection system of the present utility model comprises: the driving signal output part of central computation unit 3 shown in Figure 1 connects the driving signal input of pre-amplifier unit 2; The driving signal output part of pre-amplifier unit 2 connects the drive coil of eddy current sensor 1; The detection signal output of eddy current sensor 1 connects the detection signal input of preamplifier 2; The detection signal output of preamplifier 2 connects the detection signal input of central computation unit 3; Central computation unit 3 is calculated according to the amplitude and the phase place of detection signal, obtains liquid level signal, send DCS control system 4 by the 4-20mA signal, carries out the accurately control automatically of liquid level loop.In addition, this device also comprises, the anti-interference power of also connecting between the driving signal input of the driving signal output part of central computation unit 3 and pre-amplifier unit 2 strengthens and switching device shifter 100.
Above-mentioned anti-interference power strengthens and switching device shifter 100 is made up of power amplifier module 5 and driving switch 6.Power amplifier module 5 wherein comprises: the fader 51 that is connected with the driving signal output part of central computation unit 3; The phase regulator 52 that is connected with fader 51 outputs; The power amplifier 53 that is connected with phase regulator 52 outputs.Driving switch 6 wherein is change-over switch parts, and two switch terminal is connected with the driving signal output part of central computation unit 3 and the output of power amplifier module 5 respectively, and its output connects the driving signal input of described pre-amplifier unit 2.
Referring to Fig. 3, Fig. 3 is anti-interference driving enhancing and the switching device shifter line assumption diagram in the utility model.
Above-mentioned fader 51 is composed in series by gain selection circuit 511 and low-pass filter circuit 512.Wherein, gain selection circuit 511 is made of jumper wire device J3, resistance R 1, R2, R3 and R36, input signal can be controlled in the proper range; Low-pass filter circuit 512 is by resistance R 15, R35, capacitor C 13, C24, C25, and amplifier U1B constitutes, and can eliminate part and disturb.
Above-mentioned phase regulator 52 is composed in series by inverter circuit 521, phase-adjusting circuit 522 and buffering output circuit 523.Wherein, inverter circuit 521 is made of amplifier U1C, R32, R33 and jumper wire device J4, and jumper wire device J4 can select whether to need to carry out signal inversion; Phase-adjusting circuit 522 is made of amplifier U1D, resistance R 31, R13, R14, potentiometer P7, capacitor C 21, and signal phase is adjusted; Buffering output circuit 523 is made of amplifier U1A and resistance R 4, R5, and signal is cushioned output.
Above-mentioned power amplifier 53 can be selected the power amplifier of specialty, also can adopt discrete component resonance circuit or audio-frequency transformer to amplify.Present embodiment adopts GEDBAO P1000 type amplifier, the amplifier operating frequency range of the type is between 20Hz～20000Hz, satisfy the requirement that to use, powerful amplifier has bigger driving voltage, drive circuit and load capacity, have the amplitude that adjusting knob can be regulated output signal continuously, as required can be with the degree of the power ascension 10 times (being about as much as 3 times of amplitudes) of signal.
Above-mentioned driving switch 6 is change-over switch parts, adopts contactor circuit, is composed in series by contactor SW and external key K, and the end of external key K is connected with power supply VCC.Contactor SW is externally under the effect of button K activation signal, realize the switching of signal, contactor SW contains stiff end (SW_1) and two switch terminal (SW_2, SW_3), two switch terminal (SW_2, SW_3) are connected with the driving signal output part of described central computation unit 3 and the output of power amplifier module 5 respectively, and stiff end (SW_1) connects the driving signal input of described pre-amplifier unit 2.Switch terminals (SW_2) in the contactor SW normally-closed contact (SW_1-SW_2) and the switch terminals (SW_3) in the normally opened contact (SW_1-SW_3) are as two switch terminal, switch terminals (SW_2) in the general normally-closed contact (SW_1-SW_2) is connected with the driving signal output part of central computation unit 3, and the switch terminals (SW_3) in the normally opened contact (SW_1-SW_3) is connected with the output of power amplifier module 5.Need in the eddy current sensor work when anti-interference, external key K connects, contactor SW energising, normally opened contact (SW_1-SW_3) is communicated with, and anti-interference power enhancing and switching device shifter 100 are put in the system and moved, otherwise, in the time need not using anti-interference power enhancing and switching device shifter 100, disconnecting external button K, contactor SW outage, normally-closed contact (SW_1-SW_2) is communicated with.
As shown in Figure 3, above-mentioned anti-interference power strengthens and switching device shifter 100 is put into when moving in the system, original driving signal is at first adjusted through gain, signal amplitude is in the working range, carry out the phase place adjustment then, make the process amplifying signal identical with the primary signal phase place, amplify through power amplifier at last, final effect of amplifying is generally about 3 times of original amplitude.
Like this, driving signal amplitude behind the intensifier circuit of overdriving of original sensor increases substantially, and removes the driving sensor probe again, and central computation unit is handled calculating to detected signal, obtains liquid level numerical value.The interfering signal amplitude that is input in this process in the system is constant, but after adjusting circuit through amplitude, and the interference sections that being input to central computation unit influences final result can reduce significantly.
Except foregoing circuit, also comprise necessary conventional appurtenances such as corresponding power circuit, shunt capacitance in this device.
Those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the purpose of this utility model, and be not with opposing qualification of the present utility model, as long as in essential scope of the present utility model, all will drop in the scope of claim of the present utility model variation, the modification of the above embodiment.
Claims (5)
1, a kind of anti-interference power of eddy current sensor detection system strengthens and switching device shifter, described eddy current sensor detection system comprises: the driving signal output part of central computation unit connects the driving signal input of pre-amplifier unit, and the driving signal output part of pre-amplifier unit connects the drive coil of eddy current sensor; The detection signal output of eddy current sensor connects the detection signal input of preamplifier; The detection signal output of preamplifier connects the detection signal input of central computation unit;
It is characterized in that:
The anti-interference power of also connecting between the driving signal output part of described central computation unit and the driving signal input of pre-amplifier unit strengthens and switching device shifter;
Described anti-interference power strengthens and switching device shifter is made up of power amplifier module and driving switch;
Described power amplifier module comprises: the fader that is connected with the driving signal output part of described central computation unit; The phase regulator that is connected with the output of fader; The power amplifier that is connected with the output of phase regulator;
Described driving switch is the change-over switch parts, it contains stiff end and two switch terminal, two switch terminal are connected with the driving signal output part of described central computation unit and the output of power amplifier module respectively, and stiff end connects the driving signal input of described pre-amplifier unit.
2, the anti-interference power of eddy current sensor detection system as claimed in claim 1 strengthens and switching device shifter, it is characterized in that:
Described fader is composed in series by gain selection circuit and low-pass filter circuit.
3, the anti-interference power of eddy current sensor detection system as claimed in claim 1 strengthens and switching device shifter, it is characterized in that:
Described phase regulator is composed in series by inverter circuit, phase-adjusting circuit and buffering output circuit.
4, the anti-interference power of eddy current sensor detection system as claimed in claim 1 strengthens and switching device shifter, it is characterized in that:
Described power amplifier adopts GEDBAO P1000 type amplifier.
5, the anti-interference power of eddy current sensor detection system as claimed in claim 1 strengthens and switching device shifter, it is characterized in that:
Described change-over switch parts are contactor circuits, are composed in series by contactor and external key, and an end of external key is connected with power supply, and the switch terminals of contactor normally-closed contact and normally opened contact is respectively switch terminal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN200920068757U CN201376079Y (en) | 2009-03-12 | 2009-03-12 | Anti-interference power enhancing and switching device of vortex flow transducer detection system |
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| CN200920068757U CN201376079Y (en) | 2009-03-12 | 2009-03-12 | Anti-interference power enhancing and switching device of vortex flow transducer detection system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688996A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for inhibiting electromagnetic braking from interfering signal of liquid level meter |
-
2009
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102688996A (en) * | 2012-06-13 | 2012-09-26 | 鞍钢股份有限公司 | Method for inhibiting electromagnetic braking from interfering signal of liquid level meter |
| CN102688996B (en) * | 2012-06-13 | 2013-11-06 | 鞍钢股份有限公司 | Method for inhibiting electromagnetic braking from interfering signal of liquid level meter |
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Granted publication date: 20100106 Termination date: 20140312 |