CN203314960U - Skin impedance detector - Google Patents
Skin impedance detector Download PDFInfo
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- CN203314960U CN203314960U CN2013202419557U CN201320241955U CN203314960U CN 203314960 U CN203314960 U CN 203314960U CN 2013202419557 U CN2013202419557 U CN 2013202419557U CN 201320241955 U CN201320241955 U CN 201320241955U CN 203314960 U CN203314960 U CN 203314960U
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Abstract
The utility model relates to a skin impedance detector which comprises a power supply, a pulse generation circuit, a pulse amplification shaping circuit, a pulse output circuit, a low resistance point triggering alarm circuit and a pair of testing electrodes, wherein the pulse generation circuit is connected with the power supply to produce low voltage pulse signals with 680Hz frequency, a 200-microsecond pulse width and 5-9V voltage; the pulse amplification shaping circuit is connected with the pulse generation circuit to amplify and shape the low voltage pulse signals to form amplified square-wave pulse signals; the pulse output circuit is connected to a position between the pulse amplification shaping circuit and the pair of testing electrodes to enable the voltage of the square-wave pulse signals to be divided to produce signals with a 0-50V pulse amplitude to be outputted to skin to be detected; the low resistance point triggering alarm circuit is connected with the pulse output circuit and triggered to send out alarm prompt signals when a skin low resistance point is detected. The skin impedance detector is stably utilized to test a skin resistance result, and the detection result of skin impedance cannot be affected due to voltage differences of the testing electrodes.
Description
Technical field
This utility model relates to a kind of Skin Resistance detector.
Background technology
Skin Resistance is to study an index the most frequently used when the electrology characteristic of cave, and the electrical parameter adopted when method of testing and test has the impact of highly significant on the measurement result of Skin Resistance.
Existing Skin Resistance tester is without fixing pulse frequency and pulsewidth, and the pressure of test electrode is very large on the impact of Skin Resistance, and hypertonia easily pierces through the distribution capacity generation of human body, affects the measurement result of Skin Resistance.
The utility model content
In order to solve the existing the problems referred to above of prior art, this utility model provides a kind of Skin Resistance detector, utilizes this Skin Resistance detector test Skin Resistance result stable, can be because of the different testing results that affect Skin Resistance of the pressure of test electrode.
Technical solutions of the utility model are to form like this: a kind of Skin Resistance detector is characterized in that: it comprises power supply, pulse generating circuit, pulse amplified shaping circuit, impulse output circuit, low-resistance point trigger alarm circuit and a pair of test electrode; Described pulse generating circuit is connected with power supply, the function of the low voltage pulse signal that realize to produce frequency and be 680Hz, pulsewidth and be 200 microseconds, voltage be 5-9V; Described pulse amplified shaping circuit is connected with pulse generating circuit, realizes described low voltage pulse signal is amplified and is shaped to the function of the square-wave pulse signal of amplification; Described impulse output circuit is connected between pulse amplified shaping circuit and a pair of test electrode, realization produces signal that pulse amplitude is 0-50V as test signal by the square-wave pulse signal dividing potential drop of described amplification, and outputs to the function of skin to be detected by test electrode; Described low-resistance point trigger alarm circuit is connected with impulse output circuit, and realizing is triggered when test electrode detects skin low-resistance point sends the function of alarm signal.
Compared to prior art, the utlity model has following advantage: it not only has, and skin low-resistance point location is convenient, electrode motion scan and easy and simple to handlely, daily portably use the advantages such as convenient, and having guaranteed the stable of test result, test result is the factor impacts such as tested person electrode pressure, test conduction time and retest number of times not.
The accompanying drawing explanation
Fig. 1 is the operation principle block diagram of the Skin Resistance detector that provides of this utility model.
Fig. 2 is a kind of circuit enforcement figure of the Skin Resistance detector that provides of this utility model.
Number in the figure explanation: 1, power supply, 2, pulse generating circuit, 3, pulse amplified shaping circuit, 4, impulse output circuit, 5, low-resistance point trigger alarm circuit, 6, test electrode, 7, undervoltage warning circuit.
The specific embodiment
Below in conjunction with Figure of description, embodiment and test experience, this utility model content is elaborated:
One, embodiment
As depicted in figs. 1 and 2, this utility model embodiment provides a kind of Skin Resistance detector, it is characterized in that: it comprises power supply 1, pulse generating circuit 2, pulse amplified shaping circuit 3, impulse output circuit 4, low-resistance point trigger alarm circuit 5 and a pair of test electrode 6; Described pulse generating circuit 2 is connected with power supply 1, the function of the low voltage pulse signal that realize to produce frequency and be 680Hz, pulsewidth and be 200 microseconds, voltage be 5-9V; Described pulse amplified shaping circuit 3 is connected with pulse generating circuit 2, realizes described low voltage pulse signal is amplified and is shaped to the function of the square-wave pulse signal of amplification; Described impulse output circuit 4 is connected between pulse amplified shaping circuit 3 and a pair of test electrode 6, realization produces signal that pulse amplitude is 0-50V as test signal by the square-wave pulse signal dividing potential drop of described amplification, and outputs to the function of skin to be detected by test electrode 6; Described low-resistance point trigger alarm circuit 5 is connected with impulse output circuit 4, and realizing is triggered when test electrode 6 detects skin low-resistance point sends the function of alarm signal.
Described low-resistance point trigger alarm circuit 5 consists of the audio alarm circuit.
Described power supply 1 consists of constant voltage source V1;
Described pulse generating circuit 2 comprises following electronic component: NE555 chip U1, the first resistance R 1, the second resistance R 2, the first capacitor C 1 and the second capacitor C 2, wherein the first resistance R 1 and the second resistance R 2 are adjustable resistance, the first capacitor C 1 is polarity free capacitor, and the second capacitor C 2 is for there being polar capacitor; The anodal of constant voltage source V1 holds 4 feet to be connected with the positive pole of the second capacitor C 2, an end of the first resistance R 1, power access end 8 feet of NE555 chip U1, the replacement of NE555 chip U1 simultaneously; The equal ground connection of earth terminal 1 foot of one end of the negative pole of the negative pole of constant voltage source V1, the second capacitor C 2, the first capacitor C 1 and NE555 chip U1; One end of the other end of the first resistance R 1, the second resistance R 2 is connected with discharge end 7 feet of NE555 chip U1, and low level trigger end 2 feet of the other end of the other end of the second resistance R 2, the first capacitor C 1, NE555 chip U1, high level trigger end 6 feet of NE555 chip U1 connect simultaneously;
Described pulse amplified shaping circuit 3 comprises following electronic component: the 3rd resistance R 3, the first audion Q1, the first diode D1, the 5th resistance R 5, the 3rd capacitor C 3, the 4th resistance R 4, transformator TF1, the 4th capacitor C 4, the 5th capacitor C 5, the second diode D2 and the 3rd diode D3; Wherein the first audion Q1 is the positive-negative-positive audion, and the 3rd capacitor C 3, the 4th capacitor C 4 and the 5th capacitor C 5 are nonpolar electric capacity, and the 3rd resistance R 3, the 4th resistance R 4 and the 5th resistance R 5 are fixed resistance; The positive pole of constant voltage source V1 is connected with the emitter stage of the first audion Q1, the base stage of signal output part 3 feet of NE555 chip U1, the 3rd resistance R 3 and the first audion Q1 connects successively, one end of the positive pole of the colelctor electrode of the first audion Q1, the first diode D1, the 3rd capacitor C 3 and the first input end of transformator TF1 connect simultaneously, the negative pole of the first diode D1 is connected with an end of the 5th resistance R 5, and an end of the other end of the other end of the 5th resistance R 5, the 3rd capacitor C 3, the second input of transformator TF1 and the 4th resistance R 4 connects simultaneously; One end of one end of the first outfan of transformator TF1, the 4th capacitor C 4, the 5th capacitor C 5 and the negative pole of the second diode D2 connect simultaneously; The negative pole of the second outfan of transformator TF1, the other end of the 5th capacitor C 5, the 3rd diode D3 and the equal ground connection of the other end of the 4th resistance R 4;
Described test electrode 6 is comprised of the first test electrode and the second test electrode;
Described impulse output circuit 4 comprises following electronic component: the 14 resistance R 14, the 6th resistance R 6, voltmeter M1, ammeter M2, the 7th resistance R 7, the 8th resistance R 8 and the second audion Q2; Wherein the 14 resistance R 14 and the 8th resistance R 8 are fixed resistance, and the 6th resistance R 6 and the 7th resistance R 7 are adjustable resistance, and described the second audion Q2 is NPN type audion; One end of the positive pole of the positive pole of the other end of the 4th capacitor C 4, the second diode D2, the 3rd diode D3, the 14 resistance R 14 connects simultaneously; The other end of the 14 resistance R 14 is connected with the 6th resistance R 6, an end of the end of the other end of the 6th resistance R 6, voltmeter M1, the 8th resistance R 8 and the equal ground connection of emitter stage of the second audion Q2; The colelctor electrode of the resistance adjustment end of the 6th resistance R 6, the other end of voltmeter M1, the first test electrode, the second audion Q2 connects simultaneously; The end of the second test electrode ammeter M2 connects, and the other end of ammeter M2 is connected with an end of the 7th resistance R 7, and the base stage of the other end of the other end of the 7th resistance R 7, the 8th resistance R 8 and the second audion Q2 connects;
Described low-resistance point trigger alarm circuit 5 comprises following electronic component: the 3rd audion Q3, speaker LS1 and the 9th resistance R 9; Wherein the 3rd audion Q3 is NPN type audion, and the 9th resistance R 9 is fixed resistance; The resistance adjustment end of the 7th resistance R 7 is connected with the base stage of the 3rd audion Q3, the grounded emitter of the 3rd audion Q3, the colelctor electrode of the 3rd audion Q3 is connected with the end of speaker device LS1, the other end of speaker LS1 is connected with an end of the 9th resistance R 9, and the other end of the 9th resistance R 9 is connected with the positive pole of constant voltage source V1.
In order to send the alarm signal when the undertension, make operator change in time power supply 1, Skin Resistance detector described in the utility model also comprises the undervoltage warning circuit 7 be connected with power supply 1, and described undervoltage warning circuit 7 is realized being triggered when undertension sending the function of alarm signal.
Described undervoltage warning circuit 7 comprises following electronic component: the 4th diode D4, the tenth resistance R the 10, the 11 resistance R 11, the 4th audion Q4, the 5th audion Q5, the 5th diode D5, the 12 resistance R the 12, the 13 resistance R 13; The 4th audion Q4 and the 5th audion Q5 are NPN type audion, and the 4th diode D4 is Zener diode, and the tenth resistance R 10 is adjustable resistance, and the 11 resistance R the 11, the 12 resistance R 12 and the 13 resistance R 13 are fixed resistance; The positive pole of constant voltage source V1 is connected with the positive pole of the 4th diode D4, an end of the 12 resistance R 12 and an end of the 13 resistance R 13; The negative pole of the 4th diode D4 is connected with an end of the tenth resistance R 10; The other end of the tenth resistance R 10 is connected with an end of the 11 resistance R 11; The resistance adjustment end of the tenth resistance R 10 is connected with the base stage of the 4th audion Q4; The equal ground connection of the emitter stage of the emitter stage of the other end of the 11 resistance R 11, the 4th audion Q4, the 5th audion Q5; One end of the base stage of the colelctor electrode of the 4th audion Q4, the 5th audion Q5 and the 12 resistance R 12 connects; The colelctor electrode of the 5th audion Q5 is connected with the positive pole of the 5th diode D5, and the negative pole of the 5th diode D5 is connected with the other end of the 13 resistance R 13.
This utility model operation principle is described as follows:
(1) pulse generating circuit 2 utilizes NE555 chip U1 and the first resistance R 1, the second resistance R 2, the first capacitor C 1 to form charge-discharge circuit, the low voltage pulse signal that generation frequency 680Hz, pulsewidth 200 microseconds, voltage are 5-9V.Regulate the charging and discharging time by the first resistance R 1, the second resistance R 2.
(2) export low voltage pulse signals to pulse amplified shaping circuit 3 by 3 feet of NE555 chip U1 afterwards, through the first audion Q1(switching tube) anti-phase drive amplification, by transformator TF1 coupling output, wherein the first diode D1 and the 3rd capacitor C 3 are for transformator TF1 reverse impulse path, and eliminating the high back voltage pulse affects circuit.Transformator TF1 assurance secondary voltage and primary voltage are isolated, the square-wave pulse signal be amplified after the second diode D2, the 3rd diode D3, the 4th capacitor C 4 and the 5th capacitor C 5 circuit shapings, and the burst length is 200 microseconds.
(3) square-wave pulse signal amplified produces signal that pulse amplitudes are 0-50V as test signal through the 6th resistance R 6 dividing potential drops, the active voltage that voltmeter M1 also can the display measurement pulse.When the diverse location of skin is detected, can adjust different Voltage-outputs by the 6th resistance R 6.When in test process, when test electrode 6 touches skin low-resistance point, electric current amplifies through audio frequency, and cue is sent in the 3rd audion Q3 conducting immediately, and the 7th resistance R 7 is for regulating the threshold value of probe current.Can show in real time on ammeter M2 that electric current increases, the second audion Q2(switching tube simultaneously) for the overcurrent protection of circuit, avoid the moment change of microampere stream electric current large.
(4) effect of undervoltage warning circuit 7: when cell voltage (power supply V1) lower than normal while using magnitude of voltage, the undervoltage warning system be comprised of the 4th audion Q4 and the 5th audion Q5 and the 5th diode D5 will produce alarm signal automatically, and alert should be changed battery immediately.The specific works process is: when cell voltage is normal, and the 4th audion Q4 conducting, its colelctor electrode makes the 5th audion Q5 cut-off in low-voltage, and the 5th diode D5 is not luminous; When cell voltage is too low, the 4th audion Q4 brownout and ending, current collection is high voltage very, the 5th audion Q5 conducting, the 5th diode D5 is luminous, and account for voltage is too low; The tenth resistance R 10 available adjustment low voltage threshold, its scope is (4-6V).
Two, test experience
1) relation of test voltage and Skin Resistance
Under the electrical parameter condition adopted in this experiment { frequency 680Hz, pulsewidth 200 microseconds }.
The result that l0 name experimenter is observed, the current value of skin low-resistance point and non-low-resistance point is all with the increasing and increase (be Skin Resistance increasing and reduce with voltage) of test voltage, but the reaction of the two is entirely different.Along with increasing of test voltage, the electric current of skin low-resistance point also increases gradually.During generally to 30～40 volt, an apparent in view turnover, appear in current rush.The situation of non-low-resistance point is fully different therewith, in the voltage range that can tolerate the experimenter, (is no more than 50 volts under this experiment condition), and dermal resistance increases lentamente along with increasing of test voltage all the time, the turning point of current rush do not occur.From the characteristics of volt-ampere curve, low-resistance point is obviously different from non-low-resistance point.In the test voltage scope of 5-50 volt, the resistance value of low-resistance point all more non-low-resistance point person is low.Test voltage when 10-50 volt stepping increases progressively and then successively decrease from 50～10 volts of steppings, the variation almost symmetry of low-resistance point impedance (every grade of test is separated by 4～5 minutes).No matter be under the increasing or decreasing condition, skin impedance value during same test voltage basic identical (latter is lower slightly sometimes).But not the resistance value of low-resistance point does not all have significantly change, all the time in high impedance status.
The above results shows, in the test voltage scope usually adopted, under the electrical parameter condition adopted in this experiment, the impedance of skin low-resistance point and non-low-resistance point is stable, and the difference of highly significant is arranged between the two.
2) relation of test electrode 6 pressure and Skin Resistance
Under the electrical parameter condition adopted in this experiment [frequency 680Hz, pulsewidth 200 microseconds], the pressure of test electrode 6 is little on the impact of Skin Resistance.
Result to 10 experimenter's tests.Can find out, when the pressure of test electrode 6 increases 12.5 times, the variation of low-resistance point impedance is no more than 5%, and the reduction of non-low-resistance point impedance also is no more than 33%.From the absolute value of Skin Resistance, approximately 60 kilo-ohms of the impedances of low-resistance point, and, when electrode pressure increases to 250 gram, the resistance value of non-low-resistance point still remains on more than 600 kilo-ohms, the difference of the two is very remarkable.Continue to increase the pressure of test electrode 6, the Skin Resistance of non-low-resistance point still slowly reduces.When electrode pressure increases to 1500 gram, Skin Resistance just is reduced to 332 kilo-ohms (reducing by 64%), but still than low-resistance, puts high 4.7 times.
Visible, even test electrode 6 pressure increase 100 times, non-low-resistance point can not become the low-resistance point yet.Impose powerful mechanical stimulus at former non-low-resistance point position, make it to occur the cut reaction, the now impedance of skin is not significant variation also.
The above results shows, under the electrical parameter condition adopted in this experiment, the pressure of test electrode 6 is on not significantly impact of Skin Resistance.
3) relation of energising testing time and Skin Resistance
Under the electrical parameter condition adopted in this experiment [frequency 680Hz, pulsewidth 200 microseconds].
While usually carrying out surveying, the general string length of using is 70 pulses, even but, by 10 times of the long increases of the string of pulse (10 times of the time lengthening of the test of switching on), the Skin Resistance of non-low-resistance point only reduces the meansigma methods of 14%(to 10 experimenters' tests), not obvious change.The impedance of low-resistance point does not significantly change yet.
In continuing the energising process of 8 seconds, the Skin Resistance of low-resistance point not only can further not reduce, the trend slightly increased on the contrary.To the test result of contiguous non-low-resistance point, in continuing the energising process of 8 seconds, the Skin Resistance of non-low-resistance point all remains on more than 500 kilo-ohms, can not be reduced to the level (30 kilo-ohms) of low-resistance point.
4) impact of retest on Skin Resistance
Under the electrical parameter condition adopted in this experiment [frequency 680Hz, pulsewidth 200 microseconds].
Carry out 50 retests, in 50 retests, the impedance of low-resistance point all remains on low resistive state all the time, the highest 70K Ω, and minimum 37K Ω, average is 54.3 ± 8.2K Ω.The average of the impedance of non-low-resistance point is 858 ± l4K Ω, and wherein a minimum measured value is 437K Ω, and still the resistance value of the low-resistance point of contrast is high more than 8 times.Visible, under the electrical parameter condition adopted in this experiment, retest there is no obvious impact to Skin Resistance, more can not make non-low-resistance point become the low-resistance point.
Claims (5)
1. a Skin Resistance detector, it is characterized in that: it comprises power supply (1), pulse generating circuit (2), pulse amplified shaping circuit (3), impulse output circuit (4), low-resistance point trigger alarm circuit (5) and a pair of test electrode (6); Described pulse generating circuit (2) is connected with power supply (1), the function of the low voltage pulse signal that realize to produce frequency and be 680Hz, pulsewidth and be 200 microseconds, voltage be 5-9V; Described pulse amplified shaping circuit (3) is connected with pulse generating circuit (2), realizes described low voltage pulse signal is amplified and is shaped to the function of the square-wave pulse signal of amplification; Described impulse output circuit (4) is connected between pulse amplified shaping circuit (3) and a pair of test electrode (6), realization produces signal that pulse amplitude is 0-50V as test signal by the square-wave pulse signal dividing potential drop of described amplification, and outputs to the function of skin to be detected by test electrode (6); Described low-resistance point trigger alarm circuit (5) is connected with impulse output circuit (4), realizes being triggered and sending the function of alarm signal when test electrode (6) detects skin low-resistance point.
2. Skin Resistance detector according to claim 1, it is characterized in that: described low-resistance point trigger alarm circuit (5) consists of the audio alarm circuit.
3. Skin Resistance detector according to claim 2 is characterized in that:
Described power supply (1) consists of constant voltage source (V1);
Described pulse generating circuit (2) comprises following electronic component: NE555 chip (U1), the first resistance (R1), the second resistance (R2), the first electric capacity (C1) and the second electric capacity (C2), wherein the first resistance (R1) and the second resistance (R2) are adjustable resistance, the first electric capacity (C1) is polarity free capacitor, and the second electric capacity (C2) is for there being polar capacitor; The anodal of constant voltage source (V1) holds 4 feet to be connected with the positive pole of the second electric capacity (C2), an end of the first resistance (R1), power access end 8 feet of NE555 chip (U1), the replacement of NE555 chip (U1) simultaneously; The equal ground connection of earth terminal 1 foot of one end of the negative pole of the negative pole of constant voltage source (V1), the second electric capacity (C2), the first electric capacity (C1) and NE555 chip (U1); One end of the other end of the first resistance (R1), the second resistance (R2) is connected with discharge end 7 feet of NE555 chip (U1), and high level trigger end 6 feet of the other end of the other end of the second resistance (R2), the first electric capacity (C1), low level trigger end 2 feet of NE555 chip (U1), NE555 chip (U1) connect simultaneously;
Described pulse amplified shaping circuit (3) comprises following electronic component: the 3rd resistance (R3), the first audion (Q1), the first diode (D1), the 5th resistance (R5), the 3rd electric capacity (C3), the 4th resistance (R4), transformator (TF1), the 4th electric capacity (C4), the 5th electric capacity (C5), the second diode (D2) and the 3rd diode (D3), wherein the first audion (Q1) is the positive-negative-positive audion, and the 3rd electric capacity (C3), the 4th electric capacity (C4) and the 5th electric capacity (C5) are nonpolar electric capacity, and the 3rd resistance (R3), the 4th resistance (R4) and the 5th resistance (R5) are fixed resistance, the positive pole of constant voltage source (V1) is connected with the emitter stage of the first audion (Q1), signal output part 3 feet of NE555 chip (U1), the base stage of the 3rd resistance (R3) and the first audion (Q1) connects successively, the colelctor electrode of the first audion (Q1), the positive pole of the first diode (D1), the first input end of one end of the 3rd electric capacity (C3) and transformator (TF1) connects simultaneously, the negative pole of the first diode (D1) is connected with an end of the 5th resistance (R5), the other end of the 5th resistance (R5), the other end of the 3rd electric capacity (C3), one end of the second input of transformator (TF1) and the 4th resistance (R4) connects simultaneously, the negative pole of one end of one end of the first outfan of transformator (TF1), the 4th electric capacity (C4), the 5th electric capacity (C5) and the second diode (D2) connects simultaneously, the equal ground connection of the other end of the negative pole of the other end of the second outfan of transformator (TF1), the 5th electric capacity (C5), the 3rd diode (D3) and the 4th resistance (R4),
Described test electrode (6) is comprised of the first test electrode and the second test electrode;
Described impulse output circuit (4) comprises following electronic component: the 14 resistance (R14), the 6th resistance (R6), voltmeter (M1), ammeter (M2), the 7th resistance (R7), the 8th resistance (R8) and the second audion (Q2); Wherein the 14 resistance (R14) and the 8th resistance (R8) are fixed resistance, and the 6th resistance (R6) and the 7th resistance (R7) are adjustable resistance, and described the second audion (Q2) is NPN type audion; The positive pole of the positive pole of the other end of the 4th electric capacity (C4), the second diode (D2), the 3rd diode (D3), an end of the 14 resistance (R14) connect simultaneously; The other end of the 14 resistance (R14) is connected with the 6th resistance (R6), the equal ground connection of emitter stage of an end of the other end of the 6th resistance (R6), voltmeter (M1), an end of the 8th resistance (R8) and the second audion (Q2); The colelctor electrode of the other end of the resistance adjustment end of the 6th resistance (R6), voltmeter (M1), the first test electrode, the second audion (Q2) connects simultaneously; The second test electrode is connected with an end of ammeter (M2), the other end of ammeter (M2) is connected with an end of the 7th resistance (R7), and the other end of the other end of the 7th resistance (R7), the 8th resistance (R8) and the base stage of the second audion (Q2) connect;
Described low-resistance point trigger alarm circuit (5) comprises following electronic component: the 3rd audion (Q3), speaker (LS1) and the 9th resistance (R9); Wherein the 3rd audion (Q3) is NPN type audion, and the 9th resistance (R9) is fixed resistance; The resistance adjustment end of the 7th resistance (R7) is connected with the base stage of the 3rd audion (Q3), the grounded emitter of the 3rd audion (Q3), the colelctor electrode of the 3rd audion (Q3) is connected with an end of speaker (LS1), the other end of speaker (LS1) is connected with an end of the 9th resistance (R9), and the other end of the 9th resistance (R9) is connected with the positive pole of constant voltage source (V1).
4. Skin Resistance detector according to claim 3, it is characterized in that: it also comprises the undervoltage warning circuit (7) be connected with power supply (1), described undervoltage warning circuit (7) is realized being triggered when undertension sending the function of alarm signal.
5. Skin Resistance detector according to claim 4, it is characterized in that: described undervoltage warning circuit (7) comprises following electronic component: the 4th diode (D4), the tenth resistance (R10), the 11 resistance (R11), NPN type the 4th audion (Q4), NPN type the 5th audion (Q5), the 5th diode (D5), the 12 resistance (R12), the 13 resistance (R13); The 4th audion (Q4) and the 5th audion (Q5) are NPN type audion, the 4th diode (D4) is Zener diode, the tenth resistance (R10) is adjustable resistance, and the 11 resistance (R11), the 12 resistance (R12) and the 13 resistance (R13) are fixed resistance; The positive pole of constant voltage source (V1) is connected with the positive pole of the 4th diode (D4), an end of the 12 resistance (R12) and an end of the 13 resistance (R13); The negative pole of the 4th diode (D4) is connected with an end of the tenth resistance (R10); The other end of the tenth resistance (R10) is connected with an end of the 11 resistance (R11); The resistance adjustment end of the tenth resistance (R10) is connected with the base stage of the 4th audion (Q4); The equal ground connection of emitter stage of the emitter stage of the other end of the 11 resistance (R11), the 4th audion (Q4), the 5th audion (Q5); One end of the base stage of the colelctor electrode of the 4th audion (Q4), the 5th audion (Q5) and the 12 resistance (R12) connects; The colelctor electrode of the 5th audion (Q5) is connected with the positive pole of the 5th diode (D5), and the negative pole of the 5th diode (D5) is connected with the other end of the 13 resistance (R13).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202419557U CN203314960U (en) | 2013-05-07 | 2013-05-07 | Skin impedance detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202419557U CN203314960U (en) | 2013-05-07 | 2013-05-07 | Skin impedance detector |
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| CN203314960U true CN203314960U (en) | 2013-12-04 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103211595A (en) * | 2013-05-07 | 2013-07-24 | 福建省中医药研究院 | Skin impedance detection instrument |
| WO2019087154A1 (en) * | 2017-11-03 | 2019-05-09 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
| CN110840412A (en) * | 2019-12-09 | 2020-02-28 | 苏州大学 | Pain signal detection device based on animal body communication and detection method thereof |
| CN114288555A (en) * | 2022-01-26 | 2022-04-08 | 云南贝泰妮生物科技集团股份有限公司 | Radio frequency beauty instrument self-adaptive frequency modulation system based on skin impedance |
-
2013
- 2013-05-07 CN CN2013202419557U patent/CN203314960U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103211595A (en) * | 2013-05-07 | 2013-07-24 | 福建省中医药研究院 | Skin impedance detection instrument |
| WO2019087154A1 (en) * | 2017-11-03 | 2019-05-09 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
| US11264987B2 (en) | 2017-11-03 | 2022-03-01 | Vicwood Prosperity Technology Limited | Living body detection method and apparatus |
| CN110840412A (en) * | 2019-12-09 | 2020-02-28 | 苏州大学 | Pain signal detection device based on animal body communication and detection method thereof |
| CN114288555A (en) * | 2022-01-26 | 2022-04-08 | 云南贝泰妮生物科技集团股份有限公司 | Radio frequency beauty instrument self-adaptive frequency modulation system based on skin impedance |
| CN114288555B (en) * | 2022-01-26 | 2023-02-28 | 云南贝泰妮生物科技集团股份有限公司 | Radio frequency beauty instrument self-adaptive frequency modulation system based on skin impedance |
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