CN101708122A - Human sensing current threshold value test system and method based on encephalic electricity - Google Patents
Human sensing current threshold value test system and method based on encephalic electricity Download PDFInfo
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Abstract
The invention provides human sensing current threshold value test system and method based on encephalic electricity. The system comprises an electroencephalograph, an intelligent signal generator, a first electrode, a second electrode, a controller and an ammeter, wherein the electroencephalograph monitors a change state of the encephalic electricity characteristics of a tested person; the intelligent signal generator outputs a voltage signal; the first electrode and the second electrode are respectively connected to a human body to apply the voltage signal to the human body; the controller controls the intelligent signal generator to output the voltage signal; the ammeter is connected in series between the first electrode and the second electrode and used for measuring a true effective value of current flowing across the human body; the controller controls an amplitude of the voltage signal output by the intelligent signal generator to be automatically adjusted from small to big; and along with the gradual increase of the amplitude of the voltage signal, when the electroencephalograph monitors that the encephalic electricity characteristics of the tested person generate specific change, the controller records the true effective value of the current which is measured by the ammeter at the moment and flows across the human body to be used as a human sensing current threshold value.
Description
Technical field
The present invention relates to the human perception current measurement, more particularly, relate to a kind of human perception current threshold test macro and method of testing based on the brain electricity.
Background technology
Along with developing rapidly of science and technology, all kinds of electric and electronic products various fields in life that comprehensively enters society with instrument and equipment, Medical Instruments etc., becomes the important symbol of progress of social civilization as household electrical appliance, communication equipment, laboratory.For guaranteeing the safety of its use, the many state compulsions that comprise China have been stipulated the electrical safety performance standard and the measuring condition of each class of electronic devices, set up the electrical safety standards system,, ensured the safety of the person and property to reduce the generation of shock hazard and electrical fire.
Since five editions seven revisions are issued and gone through to No. 65 bulletins of IEC (International Electro-technical Commission---International Electrotechnical Commission) " domestic of electric network source power supply and the safety requirements of similar general purpose electronics and relevant devices " first in nineteen fifty-two, international electrical safety standard of IEC and UL national electrical safety standard two big systems such as (Underwriters Laboratories Inc.---safety of America test experience chamber companies) have been formed at present in the world.The electrical safety performance that needs before electric and electronic product comes into the market to be correlated with authenticates, and meets corresponding standard to guarantee its electrical safety performance index.There is different permit standards in different market, as the EN of JIS, the AS/NZ of Australia and New Zealand, the European Union of the UL of the U.S., Canadian CAS, Japan, the European Union standards such as GB in the BS of Britain EN, China.Although the detail portion branch in each national standard carries out an innings cloth adjustment according to national conditions, in fact these national standards all are to be transformed by the serial international standard that IEC issues, so the IEC international standard has essence and directiveness.China begins to formulate all kinds of electrical safety standards from late 1970s, has formed the national safety standard system GB of employing or adopting by equation IEC safety criterion the eighties.But because the formulation of GB standard lags behind IEC international standard and national standards such as UL, EN far away with revision, so the CCC authentication that UL carries out in China, EN occupy an leading position in the CE authentication that China carries out, and the certification work of GB lacks enough authority and popularity.
Leakage current is a most important index in the electrical safety performance test, and the fundamental basis of leakage current testing is the human body impedance network model of IEC proposition and the leakage current limit value of regulation.The proposition of IEC human body impedance network model and leakage current limit value is based on body current effect and body current effect threshold value.The body current effect mainly comprises perception, reacts, breaks away from, electric injury and ventricular fibrillation, and the corresponding current limit that flows through human body is the current effect threshold value.Usually leakage current should be controlled in the perception and kinetic current effect threshold value of human body, use the comfortableness and the safety of instrument and equipment with the assurance personnel.
The basis that human perception current threshold generalized model is set up is the sensory current threshold data that obtains human body objectively.Measuring method to the human perception current threshold is traditionally: human body hand to hand or hands are applied voltage to foot, make electric current flow through human body, determine the sensory current threshold value by the sensation (as heat, fiber crops, twinge etc.) of human body self.The measurement of perception and kinetic current when having researcher this method to be applied to human body touches with it in the vehicles such as car, bus very early.Yet, what rely on human body self feels that obtaining data has too strong subjectivity, therefore research has in recent years been introduced the Physiological Psychology statistic algorithm and has been filtered the influence of human body subjective feeling to measurement result, has improved the reliability and the concordance of data to a certain extent.
But, still need a kind of technology that obtains the human perception current threshold more objectively.
Summary of the invention
The object of the present invention is to provide a kind of system and method that can obtain the human perception current threshold objectively.
According to an aspect of the present invention, provide a kind of human perception current threshold test macro based on the brain electricity, this system comprises: electroencephalograph, the variable condition of monitoring experimenter's brain electrical feature; The intelligent signal generator, output voltage signal; First electrode and second electrode are connected respectively to human body, and voltage signal is applied on the human body; Controller, control intelligent signal generator is with output voltage signal; Ammeter, be connected between first electrode and second electrode, be used to measure the real effective of electric current of human body of flowing through, wherein, the amplitude of the voltage signal of controller control intelligent signal generator output is regulated automatically from small to large, along with the amplitude of voltage signal increases gradually, when electroencephalograph monitors experimenter's brain electrical feature generation specific change, the real effective of the electric current of the controller record human body of flowing through that ammeter is measured this moment is as the human perception current threshold.
According to a further aspect in the invention, provide a kind of human perception current threshold method of testing based on the brain electricity, this method comprises: apply voltage signal to human body; Increase the amplitude of voltage signal gradually, monitor the variable condition of experimenter's brain electrical feature simultaneously by electroencephalograph; Whether the brain electrical feature of determining the experimenter specific change takes place; If determine experimenter's brain electrical feature specific change has taken place, the real effective of the electric current of the human body of flowing through when then specific change having been taken place for experimenter's brain electrical feature is as the human perception current threshold.
Description of drawings
In conjunction with the drawings, from the description of the following examples, the present invention these and/or others and advantage will become clear, and are easier to understand, wherein:
Fig. 1 is the block diagram based on the human perception current threshold test macro of brain electricity according to the embodiment of the invention;
Fig. 2 is the flow chart based on the human perception current threshold method of testing of brain electricity according to the embodiment of the invention.
The specific embodiment
Below, describe embodiments of the invention in detail with reference to accompanying drawing.
The brain electricity is the Potential distribution that the cerebral nerve electrical activity produces on scalp, sensitive about 1000 times than electrocardiosignal of EEG signals.Corticocerebral electrical activity comprises two kinds of forms: a kind of is under the situation of no obvious stimulation, and the regular spontaneous generation rhythmicity potential change of cerebral cortex is referred to as spontaneous electrical activity of the brain; Another kind is to feel to import into system, and when comprising sensory organ, sensory nerve or sensation pathway irriate, the potential change in that a certain restricted area of cortex causes is referred to as cortical evoked potential.The brain electrical acti that can record in scalp surface is called EEG (Electroencephalogram, electroencephalogram).
In the present research, the monitoring that the brain electricity is used for depth of anesthesia is arranged, the research that the brain electricity is applied to the nerve system of human body excitability action is also arranged, utilize the stimulation of EEG research motion and language in addition human body.
The present invention proposes to come objective identification human perception current threshold based on the variation of brain electrical feature, promptly, when the electric current that flows through human body reaches threshold of perception current, the sensory organ of human body---skin at first is upset, sensory nerve conducts to brain with this stimulus signal, corticocerebral current potential is changed, so can observe human body by the variation of (spontaneous electrical activity of the brain) before the threshold of perception current electric current, human body by electroencephalogram, thereby confirm the human perception current threshold objectively by the brain electrical feature of (evoked brain potential activity) behind the threshold of perception current electric current.
Fig. 1 is the block diagram based on the human perception current threshold test macro of brain electricity according to the embodiment of the invention.
With reference to Fig. 1, human perception current threshold test macro can comprise electroencephalograph 1, controller 2, intelligent signal generator 3, ammeter 4, first electrode 5, second electrode 6.
The random waveform voltage signal of intelligent signal generator 3 output amplitude differences, frequency difference, waveform difference (comprising the variation of dutycycle).Controller 2 can be a PC, control intelligent signal generator 3 output voltage signals.The voltage signal of intelligent signal generator 3 outputs is applied on first electrode 5 and second electrode 6.The amplitude of the voltage signal of intelligent signal generator 3 outputs can be by controller 2 controls.The amplitude of the initial voltage signal of intelligent signal generator 3 outputs can be a less value.Voltage signal can be the periodic voltage signal of random waveform, and for example, the waveform of voltage signal can be a kind of in sinusoidal wave, triangular wave and the square wave, but the invention is not restricted to this, also can use the voltage signal of other waveform.In addition, the frequency adjustable of voltage signal (for example in the 50Hz-10KHz scope), dutycycle variable (for example in the 1%-99% scope).Preferably, human perception current threshold test macro also can comprise driver module 7, is used for the voltage signal of intelligent signal generator output is amplified, and the voltage signal that amplifies is offered first electrode 5 and second electrode 6.
Ammeter 4 is connected between first electrode 5 and second electrode 6, is used to measure the real effective of electric current of human body of flowing through.Ammeter 4 can adopt the current with high accuracy table, and certainty of measurement can reach μ A (microampere) level.Electroencephalograph 1 is the variable condition of monitoring experimenter's brain electrical feature in real time.The amplitude of the voltage signal of controller 2 may command intelligent signal generators 3 outputs is regulated automatically from small to large.Can increase the amplitude of voltage signal according to predetermined increment gradually.Along with the amplitude of voltage signal from small to large, when electroencephalograph 1 monitored brain electrical feature generation specific change, the real effective of the electric current of the human body of flowing through that controller 2 record ammeters this moment 4 are measured was as the human perception current threshold.The maximum amplitude controlled device 2 that is applied to the voltage signal on the human body is controlled (for example, 36 volts) within the specific limits, to guarantee experimenter's human body safety.Particularly, exceed preset range if be applied to the amplitude of the voltage signal on the human body, then controller 2 control intelligent signal generators 3 stop output voltage signal.
Human perception current threshold test macro also can comprise the time relay 8 and self-locking button 9, is connected between first electrode 5 and second electrode 6, is used to control the time that applies voltage signal to human body.Particularly, when apply the lasting predetermined amount of time of voltage to human body after, the time relay 8 makes self-locking button 9 disconnect, thereby stops to apply voltage signal to human body.
Describe below according to test of human perception current threshold and the result thereof based on the brain electricity of the present invention.
Obtain 382 groups of test datas (subject age is 22～26 years old, 16 male 3 woman, be 3 seconds conduction time, electrical path is a hand to hand, ambient temperature is about 25 ℃, humidity is about 55%, voltage waveform is sine wave, triangular wave, square wave) altogether at 19 people.
Following table 1 shows the human perception current threshold result of the test based on the brain electricity, wherein, Fourier analysis and statistics has been carried out in the variation of the α ripple before and after the energising of occipital region electroencephalogram, β ripple, θ ripple.The implication of α ripple, β ripple, θ ripple is well-known to those skilled in the art in the electroencephalogram, therefore no longer describes in detail here.
Table 1
Before the energising, 308 groups is the alpha rhythm electroencephalogram, and 33 groups is the beta response electroencephalogram, and 41 groups for mixing electroencephalogram.
After the energising, the variation of electroencephalogram feature further reduces:
In 382 routine eeg datas, the α wave amplitude suppresses or the β wave amplitude suppresses or both suppress simultaneously, comprises by the α electroencephalogram and changes into the β electroencephalogram, mixes electroencephalogram or electroencephalogram flat,isoelectric electroencephalogram, also comprises by mixing electroencephalogram and changes into the β electroencephalogram, amount to 313 examples, account for 82.94% of total data.
The α wave amplitude increases or the β wave amplitude increases or both increase simultaneously, comprises by β electroencephalogram or mixing electroencephalogram changing into the α electroencephalogram, and the β electroencephalogram has added the signal (for example 50Hz signal) of characteristic frequency, amounts to 48 examples, accounts for 12.57% of total data.
Change into the θ electroencephalogram, amount to 14 examples, all appear at human body and flow through under the sinusoidal threshold of perception current current conditions of 1000Hz.
More than in 382 examples, amount to 375 routine electroencephalograms and take place obviously to change, account for 98.17% of total data, wherein 22 routine human bodies are not felt but obvious change has taken place the electroencephalogram feature as yet, account for 5.76% of total data.In addition, human body is felt but electroencephalogram does not have 7 examples of significant change, accounts for 1.83% of total data.
Reach a conclusion thus: the threshold of perception current electric current can make human body electroencephalogram's feature take place obviously to change, and major part causes that α ripple or β wave amplitude suppress, and causes that on a small quantity α ripple or β wave amplitude increase, and the θ electroencephalogram is all corresponding to the sinusoidal threshold of perception current electric current of 1000Hz.With the monitoring means of electroencephalogram,, be feasible therefore with adopting the error rate of experimental data to be reduced to 1.83% by 5.76% of traditional method as the human perception current threshold.
Therefore, previously described brain electrical feature generation specific change can be following any: the α electroencephalogram is changed into the α wave amplitude and is suppressed; The α electroencephalogram is changed into the β electroencephalogram; The α electroencephalogram is changed into the mixing electroencephalogram; The α electroencephalogram is changed into the α wave amplitude and is increased; The α electroencephalogram is changed into the θ electroencephalogram; The α electroencephalogram is changed into electroencephalogram flat,isoelectric electroencephalogram; The β electroencephalogram is changed into the β wave amplitude and is suppressed; The β electroencephalogram is changed into the β wave amplitude and is increased; The β electroencephalogram is changed into the mixing electroencephalogram; The β electroencephalogram is changed into the α electroencephalogram; The β electroencephalogram is changed into the signal that the β electroencephalogram has added characteristic frequency; The β electroencephalogram is changed into the θ electroencephalogram; Mix electroencephalogram and change into the β electroencephalogram; Mix electroencephalogram and change into the inhibition of α wave amplitude; Mix electroencephalogram and change into the α electroencephalogram; Mix electroencephalogram and change into the θ electroencephalogram; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all increases; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all suppresses; Mix electroencephalogram and change into the inhibition of β wave amplitude.
Fig. 2 is the flow chart based on the human perception current threshold method of testing of brain electricity according to the embodiment of the invention.
With reference to Fig. 2,, apply voltage signal to human body in step 201.Can be by applying voltage signal to human body with first electrode and second electrode that human body contacts respectively.
In step 202, increase the amplitude of voltage signal gradually, monitor the variable condition of experimenter's brain electrical feature simultaneously by electroencephalograph.
In step 203, determine whether experimenter's brain electrical feature specific change takes place.
In step 204, specific change has taken place if determine experimenter's brain electrical feature, the real effective of the electric current of the human body of flowing through when then specific change having been taken place for experimenter's brain electrical feature is as the human perception current threshold.
On the other hand, if determine that in step 204 specific change does not take place experimenter's brain electrical feature, then this method proceeds to step 205, whether exceeds preset range with the amplitude of the voltage signal of determining to be applied to human body.Do not exceed preset range if be applied to the amplitude of the voltage signal of human body, then this method turns back to step 202, continues to increase the amplitude of voltage signal.Exceeded preset range if be applied to the amplitude of the voltage signal of human body, then this method stops.
According to the present invention, can obtain the human perception current threshold objectively based on the brain electrical feature.On this basis, can further set up leakage current human perception current threshold broad sense mathematical model, and development can the compatible to IEC model and the leakage current broad sense test macro with higher measuring accuracy and sensitivity of mathematical model.
Though the present invention is specifically described with reference to its exemplary embodiment and is shown, but will be understood by those skilled in the art that, under the situation that does not break away from the spirit and scope of the present invention that are defined by the claims, can carry out the various changes of form and details to it.
Claims (10)
1. human perception current threshold test macro based on the brain electricity comprises:
Electroencephalograph, the variable condition of monitoring experimenter's brain electrical feature;
The intelligent signal generator, output voltage signal;
First electrode and second electrode are connected respectively to human body, and voltage signal is applied on the human body;
Controller, control intelligent signal generator is with output voltage signal;
Ammeter is connected between first electrode and second electrode, is used to measure the real effective of electric current of human body of flowing through,
Wherein, the amplitude of the voltage signal of controller control intelligent signal generator output is regulated automatically from small to large, along with the amplitude of voltage signal increases gradually, when electroencephalograph monitors experimenter's brain electrical feature generation specific change, the real effective of the electric current of the controller record human body of flowing through that ammeter is measured this moment is as the human perception current threshold.
2. human perception current threshold test macro according to claim 1 also comprises: driver module, the voltage signal that the intelligent signal generator is exported amplifies, and the voltage signal that amplifies is offered first electrode and second electrode.
3. human perception current threshold test macro according to claim 1 and 2 also comprises: the time relay and self-locking button, be connected between first electrode and second electrode, and be used to control the time that applies voltage signal to human body.
4. human perception current threshold test macro according to claim 3 wherein, exceeds preset range if be applied to the amplitude of the voltage signal on the human body, and then controller control intelligent signal generator stops output voltage signal.
5. human perception current threshold test macro according to claim 4, wherein, the waveform of the voltage signal of intelligent signal generator output is a kind of in sinusoidal wave, triangular wave and the square wave.
6. human perception current threshold test macro according to claim 4, wherein, described brain electrical feature generation specific change is following any: the α electroencephalogram is changed into the α wave amplitude and is suppressed; The α electroencephalogram is changed into the β electroencephalogram; The α electroencephalogram is changed into the mixing electroencephalogram; The α electroencephalogram is changed into the α wave amplitude and is increased; The α electroencephalogram is changed into the θ electroencephalogram; The α electroencephalogram is changed into electroencephalogram flat,isoelectric electroencephalogram; The β electroencephalogram is changed into the β wave amplitude and is suppressed; The β electroencephalogram is changed into the β wave amplitude and is increased; The β electroencephalogram is changed into the mixing electroencephalogram; The β electroencephalogram is changed into the α electroencephalogram; The β electroencephalogram is changed into the signal that the β electroencephalogram has added characteristic frequency; The β electroencephalogram is changed into the θ electroencephalogram; Mix electroencephalogram and change into the β electroencephalogram; Mix electroencephalogram and change into the inhibition of α wave amplitude; Mix electroencephalogram and change into the α electroencephalogram; Mix electroencephalogram and change into the θ electroencephalogram; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all increases; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all suppresses; Mix electroencephalogram and change into the inhibition of β wave amplitude.
7. human perception current threshold method of testing based on the brain electricity comprises:
Apply voltage signal to human body;
Increase the amplitude of voltage signal gradually, monitor the variable condition of experimenter's brain electrical feature simultaneously by electroencephalograph;
Whether the brain electrical feature of determining the experimenter specific change takes place;
If determine experimenter's brain electrical feature specific change has taken place, the real effective of the electric current of the human body of flowing through when then specific change having been taken place for experimenter's brain electrical feature is as the human perception current threshold.
8. human perception current threshold method of testing according to claim 7 also comprises: exceed preset range if be applied to the amplitude of the voltage signal of human body, then described method stops.
9. human perception current threshold method of testing according to claim 8, wherein, the waveform that is applied to the voltage signal of human body is a kind of in sinusoidal wave, triangular wave and the square wave.
10. human perception current threshold method of testing according to claim 9, wherein, described brain electrical feature generation specific change is following any: the α electroencephalogram is changed into the α wave amplitude and is suppressed; The α electroencephalogram is changed into the β electroencephalogram; The α electroencephalogram is changed into the mixing electroencephalogram; The α electroencephalogram is changed into the α wave amplitude and is increased; The α electroencephalogram is changed into the θ electroencephalogram; The α electroencephalogram is changed into electroencephalogram flat,isoelectric electroencephalogram; The β electroencephalogram is changed into the β wave amplitude and is suppressed; The β electroencephalogram is changed into the β wave amplitude and is increased; The β electroencephalogram is changed into the mixing electroencephalogram; The β electroencephalogram is changed into the α electroencephalogram; The β electroencephalogram is changed into the signal that the β electroencephalogram has added characteristic frequency; The β electroencephalogram is changed into the θ electroencephalogram; Mix electroencephalogram and change into the β electroencephalogram; Mix electroencephalogram and change into the inhibition of α wave amplitude; Mix electroencephalogram and change into the α electroencephalogram; Mix electroencephalogram and change into the θ electroencephalogram; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all increases; The mixing electroencephalogram is changed into the α ripple, the β wave amplitude all suppresses; Mix electroencephalogram and change into the inhibition of β wave amplitude.
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| CN108990411A (en) * | 2017-04-04 | 2018-12-11 | Gp好科技株式会社 | The skin measurement device of the aqueous degree of skin is measured using voltage application electrode and current detection electrode |
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| CN108990411A (en) * | 2017-04-04 | 2018-12-11 | Gp好科技株式会社 | The skin measurement device of the aqueous degree of skin is measured using voltage application electrode and current detection electrode |
| CN108990411B (en) * | 2017-04-04 | 2021-04-20 | Gp好科技株式会社 | Skin measuring device for measuring skin moisture content using voltage application electrode and current detection electrode |
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Application publication date: 20100519 |