CN105662409B - A kind of detection method of skin surface situation - Google Patents
A kind of detection method of skin surface situation Download PDFInfo
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- CN105662409B CN105662409B CN201610013101.1A CN201610013101A CN105662409B CN 105662409 B CN105662409 B CN 105662409B CN 201610013101 A CN201610013101 A CN 201610013101A CN 105662409 B CN105662409 B CN 105662409B
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000005259 measurement Methods 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 11
- 230000009466 transformation Effects 0.000 claims abstract description 10
- 238000013213 extrapolation Methods 0.000 claims abstract description 4
- 238000013499 data model Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000523 sample Substances 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 6
- 239000002352 surface water Substances 0.000 claims description 5
- 238000010181 skin prick test Methods 0.000 claims 1
- 238000000691 measurement method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract 1
- 239000003921 oil Substances 0.000 description 18
- 239000004519 grease Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000003796 beauty Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000036541 health Effects 0.000 description 3
- 239000004020 conductor Substances 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 230000006698 induction Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000036559 skin health Effects 0.000 description 2
- CVOFKRWYWCSDMA-UHFFFAOYSA-N 2-chloro-n-(2,6-diethylphenyl)-n-(methoxymethyl)acetamide;2,6-dinitro-n,n-dipropyl-4-(trifluoromethyl)aniline Chemical compound CCC1=CC=CC(CC)=C1N(COC)C(=O)CCl.CCCN(CCC)C1=C([N+]([O-])=O)C=C(C(F)(F)F)C=C1[N+]([O-])=O CVOFKRWYWCSDMA-UHFFFAOYSA-N 0.000 description 1
- 206010013786 Dry skin Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/05—Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves
- A61B5/053—Measuring electrical impedance or conductance of a portion of the body
- A61B5/0537—Measuring body composition by impedance, e.g. tissue hydration or fat content
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/44—Detecting, measuring or recording for evaluating the integumentary system, e.g. skin, hair or nails
- A61B5/441—Skin evaluation, e.g. for skin disorder diagnosis
- A61B5/443—Evaluating skin constituents, e.g. elastin, melanin, water
Abstract
The invention belongs to fields of communication technology, and in particular to a kind of detection method of skin surface situation, this method include:Pass through the relationship between a measurement by capacitance circuit counting capacitor discharge time and pulse count value based on voltage/time transformation；Go out the equivalent resistance and equivalent capacity of skin surface situation by time cycle Extrapolation；The moisture and fat content of skin surface are calculated by equivalent capacity and equivalent resistance.The detection method of heretofore described detection skin surface situation, is capacitance measurement circuit convert based on V/T, a charge and discharge is only carried out to measured capacitance, measurement to measured capacitance can be completed, the measurement method is easy reliably, high certainty of measurement.
Description
Technical field
The invention belongs to medical treatment and application of net field, more particularly to a kind of detection methods of skin surface situation.
Background technology
Life (profession) beauty, medical cosmetology (traditional Chinese medicine beautifying) interpenetrate, and are complementary to one another, and promote the fast of China's beauty culture
Hail exhibition.The enhancing of social progress and general public beauty and health care health care consciousness with the development of science and technology, China are portable
Healthy related equipment market potential is huge.
Beautifying skin should combine closely first with skin care, pass through the water content of monitoring skin surface, sebum film, bullet
Property etc. situations, can adjust in time water oil it is unbalance caused by have dry skin, be coarse, the damages such as furfur or greasy, clogging of pores
Capacitive situation.
By taking moisture content of skin as an example, moisture content of skin is determined by several factors, including internal factor and external factor.It is internal
Factor includes mainly the biochemical change etc. of age and skin.External factor is more complicated, including environment, temperature, humidity, sky
Vaporous condition and the cosmetics etc. used.Skin mainly keeps moisture, the water content of cuticula to determine by cuticula
The water content of skin is determined, cuticula is the outermost layer of skin.Only when the water content of cuticula is higher than 10%, skin is only
Health, thus moisture content of skin number whether decide skin health, therefore the water content for detecting skin can evaluate skin
The health status of skin simultaneously suitably nurses skin.
The method and portable equipment of many detection moisture of skin or oiliness are had existed in the prior art, these equipment are main
It is that skin is touched by conductive electrode, detects the variation of electric signal to judge the percentage of moisture.But current existing skill
In art, it is difficult to accurately measure the accurate situation of skin surface, the skin care suggestion of the directiveness of profession can not be provided the user with.
Invention content
The purpose of the present invention is being directed to deficiency in the prior art, a kind of detection method of skin surface situation is provided, with
Solve the problems, such as the existing water content and oiliness content that can not accurately measure skin surface.
Realize the technical scheme is that, a kind of detection method of skin surface situation, this method includes：
By one based on voltage/time transformation measurement by capacitance circuit counting capacitor discharge time and pulse count value it
Between relationship；
Go out the equivalent resistance and equivalent capacity of skin surface situation by time cycle Extrapolation；
The water content and fat content of skin surface are calculated by equivalent capacity and equivalent resistance.
Further, the measurement by capacitance circuit of the voltage/time transformation includes：One current source, the current source with
Capacitance constitutes closed circuit by an electronic switch, and the both ends of capacitance are connected respectively to the input terminal of voltage comparator, voltage ratio
Output end compared with device is connected to microprocessor, and the input terminal of microprocessor is also associated with an analog switch, the input of analog switch
End is connected to power supply by another electronic switch.The microprocessor can be microcontroller.
Further, pass through the method packet of the time cycle anti-equivalent resistance for releasing skin surface situation and equivalent capacity
It includes：
Voltage value when first calculating certain any time to capacitor charging, and define the voltage value on any time capacitance
Using following formula：
Vt=V0+ (Vu-V0) * [1-exp (- t/RC)], wherein V0 is the initial voltage value on capacitance, and Vu fills for capacitance
Voltage value after full electricity；
It is 0 to define the initial voltage value on capacitance, and calculates charging and terminate the time needed；
It after capacitance is fully charged, then discharges capacitance, and calculates the voltage value in discharge process on any time capacitance, it is fixed
Voltage value on the adopted any time capacitance uses following formula；
Vt=Vu*exp (- t/RC), wherein Vu is the voltage value after capacitance is fully charged；
Period discharge time is obtained by microprocessor timing.
Further, the above method further includes that human skin is equivalent to capacitance data model, with the probe of fixed shape
Electrode test human skin capacitance.
Further, the above method further includes establishing equivalent capacity and human skin water content and fat content respectively
Equivalent data model, and the equivalent capacity with measuring probe contact electrode is calculated, then according to the equivalent capacity of foundation
Data model calculates separately out the measured value of skin surface water content and fat content.
Further, it establishes the equivalent capacity and the data model of human skin water content includes：
According to the sensing area of the probe electrode contacted with human skin；
The capacitance measurement circuit converted according to voltage/time calculates discharge time T and obtains the first quantized data；
Equivalent capacity, which is calculated, according to C=T/R in series circuit obtains the second quantized data；
According in series circuit equivalent capacity and sensing area calculate the dielectric constant of human skin；
Third quantized data is obtained after the dielectric constant is quantified；
Record the corresponding third quantized data of the corresponding dielectric constant of the skin moisture content；
Count the template data that the skin moisture content is formed with corresponding third quantized data；
According to the template data, the equivalent electricity of moisture content that the skin moisture content is formed with corresponding quantized data is established
Hold data model, wherein the moisture content equivalent capacity data model indicates that third quantized data is corresponding with skin moisture content
Relationship is expressed as：
- 8 wherein X of X=12*LN (C) indicate that skin moisture content, C indicate that the skin equivalent capacitance value, LN close for logarithm
It is formula, finally calculates skin moisture content value.
Further, the data model for establishing the equivalent capacity and human skin grease's content includes：
According to the sensing area of the probe electrode contacted with human skin；
The capacitance measurement converted according to voltage/time calculates discharge time T and obtains the 4th quantized data；
Equivalent capacity, which is calculated, according to C=T/R in series circuit obtains the 5th quantized data；
According in series circuit equivalent capacity and sensing area calculate the dielectric constant of human skin；
The 6th quantized data is obtained after the dielectric constant is quantified；
Record corresponding 6th quantized data of the corresponding dielectric constant of the skin oil and fat content；
Count the template data that the skin oil and fat content is formed with corresponding 6th quantized data；
According to the template data, the equivalent electricity of grease that the skin oil and fat content is formed with corresponding quantized data is established
Hold data model, is closed wherein the grease equivalent capacity data model indicates that the 6th quantized data is corresponding with skin oil and fat content
System is expressed as：
Y=C/32+13；Y indicates that skin oil and fat content, C indicate the skin equivalent capacitance value, calculate skin oil and fat and contain
Magnitude.
Further, the grid electrode that the sensing area of the probe electrode is equivalent to fixed dimension, is evenly distributed.
Further, the measurement by capacitance circuit further includes having keyboard and display, is separately connected the microprocessor.
A kind of detection method of skin surface situation disclosed in this invention, is the capacitance measurement circuit converted based on V/T,
A charge and discharge only being carried out to measured capacitance, measurement to measured capacitance can be completed, the measurement method is easy to be reliable, measures essence
Degree is high.
Description of the drawings
Fig. 1 is the flow diagram of the detection method of skin surface situation in a preferred embodiment of the present invention.
Fig. 2 is the schematic diagram of measurement by capacitance circuit in the embodiment of the present invention.
Fig. 3 is the relation schematic diagram of the capacitor discharge time and counting pulse in Fig. 2.
Specific implementation mode
Below in conjunction with attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, but not as
Limitation of the invention.
Shown in Fig. 1 to Fig. 2, a kind of detection method of skin surface situation disclosed in the embodiment of the present invention, mainly
It is to be related to the survey of the detection to human skin water content and/or oiliness comprising following steps:
Step 1：The measurement by capacitance circuit counting capacitor discharge time converted by a voltage/time and counting pulse
Relationship between value；
Step 2：Go out the equivalent resistance and equivalent capacity of skin surface situation by time cycle Extrapolation；
Step 3：The water content and fat content of skin surface are calculated by equivalent capacity and equivalent resistance.
With reference to shown in Fig. 2, in step 1, the measurement by capacitance circuit of voltage/time (V/T) transformation includes：One
Current source, the current source constitute closed circuit with capacitance by an electronic switch, and the both ends of capacitance are connected respectively to voltage ratio
Compared with the input terminal of device, the output end of voltage comparator is connected to microprocessor, and the input terminal of microcontroller is also associated with a simulation and opens
It closes, the input terminal of analog switch is connected to power supply by another electronic switch, and analog switch mainly completes signal link
In signal handoff functionality, the on-off mode of metal-oxide-semiconductor can be used, with realize to signal link turn off or open；The electricity
Sub switch refers to that the running unit of connecting and disconnecting of the circuit is realized using electronic circuit and power electronic devices, includes at least one controllably
Electric drive device, such as thyristor, transistor, field-effect tube, silicon-controlled, relay.The measurement by capacitance circuit is also
Include keyboard and display, be separately connected the microprocessor, keyboard microprocessor can be carried out data command transmission or
Modification.Circuit in the embodiment of the present invention uses capacitance type sensor, and measured variation is converted into electric capacitance change
A kind of device.Capacitance type sensor has that simple in structure, resolving power is high, reliable operation, dynamic response are fast, can non-cpntact measurement
Feature.
Wherein, current source Io is accurate constant current tube, it passes through electronic switch K closed circuits in series, capacitance with capacitance C
The both ends of C are connected to the input terminal of voltage comparator P, and measurement process is as follows：When K1 is closed, reference voltage to capacitor charging extremely
Uc=Us, then K1 disconnections, K2 are closed, and capacitance discharges under the action of current source, and the internal counter of microprocessor is opened simultaneously
Beginning work.When current source is discharged to Uc=0 to capacitance, comparator overturning, counter terminates to count, and count value is discharged with capacitance
Time is directly proportional, counts pulse and discharge time relationship is as shown in Figure 3.
Capacitance voltage Uc and the relationship of discharge current Io are：
Uc=0 is enabled, then is had:
In formula, N is the reading of counter；Tc is the period for counting pulse；It is a constant；It is definite value in Us and Io
When, C is directly proportional to N.
Capacitance measurement circuit based on V/T transformation in the present invention, only carries out measured capacitance charge and discharge and can be completed
Measurement to measured capacitance.The higher time measuring principle of accuracy in electronic technology is used, it is faint to overcome traditional measurement
The shortcomings of stability of amplifier is bad in signal circuit, null offset is big, and circuit structure is simple, measurement accuracy and resolution ratio
It is high.
Wherein, in above-mentioned steps two, pass through the time cycle anti-equivalent resistance for releasing skin surface situation and equivalent electricity
The method of appearance includes：
Voltage value when first calculating certain any time to capacitor charging, and define the voltage value on any time capacitance
Using following formula：
Vt=V0+ (Vu-V0) * [1-exp (- t/RC)], wherein V0 is the initial voltage value on capacitance, and Vu fills for capacitance
Voltage value after full electricity, exp are indicated using e as the exponential function at bottom；
It is 0 to define the initial voltage value on capacitance, and calculates charging and terminate the time needed；
It after capacitance is fully charged, then discharges capacitance, and calculates the voltage value in discharge process on any time capacitance, it is fixed
Voltage value on the adopted any time capacitance uses following formula；
Vt=Vu*exp (- t/RC), wherein Vu is the voltage value after capacitance is fully charged；
Period discharge time is obtained by microprocessor timing.
Specifically, it is assumed that there is power supply Vu to charge to capacitance C by resistance R, V0 is the initial voltage value on capacitance, and Vu is
Voltage value after capacitance is fully charged, voltage value when Vt is any time t on capacitance, then it is public to obtain following calculating
Formula：
Vt=V0+ (Vu-V0) * [1-exp (- t/RC)]
If the initial voltage on capacitance is 0, formula can be reduced to：
Vt=Vu* [1-exp (- t/RC)]
As shown from the above formula, because exponential quantity is only possible to be infinitely close to 0, but never it is equal to 0, so capacitance is electric
Amount will be completely filled with, and need the infinitely great time.
As t=RC, Vt=0.63Vu；
As t=2RC, Vt=0.86Vu；
As t=3RC, Vt=0.95Vu；
As t=4RC, Vt=0.98Vu；
As t=5RC, Vt=0.99Vu；
As it can be seen that after 3~5 RC, charging process terminates substantially, and electricity can be filled substantially with.
After capacitance is fully charged, by power supply Vu short circuit, capacitance C can be by being discharged with resistance R, then any time t, on capacitance
Voltage be：
Vt=Vu*exp (- t/RC)
For the series circuit of skin surface, time constant is equal to the equivalent resistance R's and equivalent capacity C of skin surface
Product, t=RC, when capacitance discharges, when by a time constant RC, the voltage on capacitance drops to the 0.37 of supply voltage
Times, time cycle t can be obtained by microprocessor timing, and be known resistance value because of R, therefore measured capacitance can be calculated
Capacitance C=t/R.And then the grease for the water content and skin for calculating skin surface by equivalent capacity and equivalent resistance contains
Amount.
Measurement by capacitance circuit in the present invention can be integrated in a chip, and connect skin surface by a probe.
The measuring principle of skin surface water content and fat content of the present invention is described in detail below.
The test philosophy of skin moisture be based on water (81) and other substances dielectric constant (<7) change quite big.According to
The difference of water content, measuring capacitor with the probe electrode of fixed shape can change with the electric capacitance change of skin, and skin
In measurable range, the water content and oil content of skin are calculated by establishing equivalent capacity data model again for the capacitance of skin
Content.
Skin is made of moisture content, oil content, fibrous matter, and the total amount of fibrous matter is basicly stable, no too big after adult
Variation, so moisture content and oil content are substantially at association relationship.Moisture content can be calculated by establishing association relationship data model
Content and oil content content.
The present invention is the measurement method using capacitance method, (such as than other methods：Bio-electrical impedance measuring method) it is more superior,
There is no unnatural contact between skin and test probe electrode due to being measured, passes through measured skin almost without electric current
Skin, therefore test result is not influenced by polarity effect and ionic conductivity.Moisture content in probe electrode and skin establishes balance
In the process without inertia, may be implemented quickly to measure, while eliminating influence of the viable skin to measurement result.
In capacitance measurement method, human skin can be equivalent to capacitance data model, i.e. measuring probe electrode is concatenated
Equivalent capacity.Equivalent capacity is influenced by skin surface water content and fat content simultaneously, and the capacitance based on V/T transformation is surveyed
Amount method calculates the equivalent capacitance value C of the human skin contacted with measuring probe electrode, then based on equivalent capacitance data mould
Type calculates separately out the measured value of skin surface water content and fat content.
Further, in the present invention, skin moisture content and grease can be detected based on CORNEOMETER- capacitance methods
Content, this method include：
The capacitance measurement circuit method of V/T transformation is set
Detect the latticed sensing area of the fixed size of the probe electrode of the skin contact
Capacitance measurement method microprocessor based on V/T transformation calculates the discharge time T of equivalent capacity C.
For series circuit, time constant is equal to the product of resistance R and capacitance C, T=RC.Because R is known resistance value,
Therefore the capacitance C=T/R of measured capacitance can be calculated
It establishes the equivalent capacity and the data model of human skin water content includes：
According to the sensing area of the probe electrode contacted with human skin
Discharge time T, which is calculated, according to the V/T capacitance measurements converted obtains the first quantized data
Equivalent capacity, which is calculated, according to C=T/R in series circuit obtains the second quantized data
According in series circuit equivalent capacity and sensing area calculate the dielectric constant of human skin
Third quantized data is obtained after the dielectric constant is quantified
Record the corresponding third quantized data of the corresponding dielectric constant of the skin moisture content
Count the template data that the skin moisture content is formed with corresponding third quantized data
According to the template data, the equivalent electricity of moisture content that the skin moisture content is formed with corresponding quantized data is established
Hold data model, is closed wherein the moisture content equivalent capacity data model indicates that third quantized data is corresponding with skin moisture content
System indicates as follows：
- 8 wherein X of X=12*LN (C) indicate that skin moisture content, C indicate that the skin equivalent capacitance value, LN close for logarithm
It is formula, calculates skin moisture content value
Further, the data model for establishing the equivalent capacity and human skin grease's content includes：
According to the sensing area of the probe electrode contacted with human skin；
Discharge time T, which is calculated, according to the V/T capacitance measurements converted obtains the 4th quantized data；
Equivalent capacity, which is calculated, according to C=T/R in series circuit obtains the 5th quantized data；
According in series circuit equivalent capacity and sensing area calculate the dielectric constant of human skin；
The 6th quantized data is obtained after the dielectric constant is quantified；
Record corresponding 6th quantized data of the corresponding dielectric constant of the skin oil and fat content；
Count the template data that the skin oil and fat content is formed with corresponding 6th quantized data；
According to the template data, the equivalent electricity of grease that the skin oil and fat content is formed with corresponding quantized data is established
Hold data model, is closed wherein the grease equivalent capacity data model indicates that the 6th quantized data is corresponding with skin moisture content
It is table：
Y=C/32+13；Y indicates that skin oil and fat content, C indicate the skin equivalent capacitance value, calculate skin oil and fat and contain
Magnitude.
The principle of the sensing area of probe electrode for detecting the skin contact includes：The induction of the probe electrode
The grid electrode that area can be equivalent to fixed dimension, be evenly distributed forms a low-voltage AC electric field in electric conductor,
When the induction region of the electrode described in the skin contact, due to human body electric field, skin can form an equivalent capacity with conductor interlayer,
Therefore the discharge time values of capacitance can be calculated by detecting the variation microcontroller of capacitance.
Test result of the method through the invention to human skin moisture and oiliness is shown below by following table.Not
Different weight percentage contained by same time moisture and oil, corresponding skin moisture content value and oiliness content value are different.
Table (one)
By the sample data to being based in upper table (one), the relationship of water content and equivalent capacity is counted and calculated
The relationship of formula, fat content and equivalent capacity.
It is the capacitance converted based on V/T that the water content of skin surface and the measurement method of fat content are calculated in the present invention
Measuring circuit only carries out measured capacitance charge and discharge and measurement to measured capacitance can be completed, which can
It leans on, high certainty of measurement.
In addition, the circuit that method using the present invention is applied can be set in a wearable device, the wearable device
It can be Intelligent bracelet, smartwatch, intelligent necklace, intelligent ring or other intelligent ornaments etc., not be limited in any way herein.
It is described it is wearable on display can be set, with the water content of real-time display skin and oil content data, other than routine use,
User can also carry when going on business, travelling, and grasp the skin health state of oneself whenever and wherever possible, better to carry out
Maintenance.
Although above in association with preferred embodiment, invention has been described, it should be appreciated by those skilled in the art,
Method and system of the present invention is not limited to the embodiment described in specific implementation mode, is wanted without departing substantially from by appended right
Ask book limit spirit and scope of the invention in the case of, can to the present invention various modification can be adapted, increase and replace.
Claims (6)
1. a kind of detection method of skin surface situation, which is characterized in that this method includes：
By between a measurement by capacitance circuit counting capacitor discharge time and pulse count value based on voltage/time transformation
Relationship；
Go out the equivalent resistance and equivalent capacity of skin surface situation by time cycle Extrapolation；
The water content and/or fat content of skin surface are calculated by equivalent capacity and equivalent resistance；
The above method further includes that human skin is equivalent to capacitance data model, and human body is tested with the probe electrode of fixed shape
Skin pricktest capacity；The above method further includes establish equivalent capacity and human skin water content and fat content respectively equivalent
Data model, and the equivalent capacity with measuring probe contact electrode is calculated, then according to the equivalent capacity data mould of foundation
Type calculates separately out the measured value of skin surface water content and fat content；
It establishes the equivalent capacity and the equivalent data model of human skin water content includes：
According to the sensing area of the probe electrode contacted with human skin；
The capacitance measurement circuit converted according to voltage/time calculates discharge time T and obtains the first quantized data；
Equivalent capacity is calculated according to C=T/R in series circuit and obtains the second quantized data, and R is the equivalent resistance of skin surface；
According in series circuit equivalent capacity and sensing area calculate the dielectric constant of human skin；
Third quantized data is obtained after the dielectric constant is quantified；
Record the corresponding third quantized data of the corresponding dielectric constant of the skin moisture content；
Count the template data that the skin moisture content is formed with corresponding third quantized data；
According to the template data, the equivalent electricity of moisture content that the skin moisture content is formed with corresponding third quantized data is established
Hold data model, wherein the moisture content equivalent capacity data model indicates that third quantized data is corresponding with skin moisture content
Relationship is expressed as：
- 8 wherein X of X=12*LN (C) indicate that skin moisture content, C indicate that the skin equivalent capacitance value, LN are logarithmic relationship
Formula finally calculates skin moisture content value.
2. the detection method of skin surface situation as described in claim 1, which is characterized in that the voltage/time transformation
Measurement by capacitance circuit includes：One current source, the current source constitute closed circuit with capacitance by an electronic switch, capacitance
Both ends are connected respectively to two input terminals of voltage comparator, and the output end of voltage comparator is connected to microprocessor, microprocessor
The input terminal of device is also associated with an analog switch, and the input terminal of analog switch is connected to power supply by another electronic switch.
3. the detection method of skin surface situation as described in claim 1, which is characterized in that counter release skin by the time cycle
The equivalent resistance of skin surface appearance and the method for equivalent capacity include：
Voltage value when first calculating certain any time to capacitor charging, and define the use of the voltage value on any time capacitance
Following formula：
Vt=V0+ (Vu-V0) * [1-exp (- t/RC)], wherein V0 is the initial voltage value on capacitance, and Vu is that capacitance is fully charged
Voltage value afterwards, R are the equivalent resistance of skin surface, and C is the equivalent capacity of skin surface, and t is the time cycle；
It is 0 to define the initial voltage value on capacitance, and calculates charging and terminate the time needed；
It after capacitance is fully charged, then discharges capacitance, and calculates the voltage value in discharge process on any time capacitance, definition should
Voltage value on any time capacitance uses following formula；
Vt=Vu*exp (- t/RC), wherein Vu is the voltage value after capacitance is fully charged；
Period discharge time is obtained by microprocessor timing.
4. the detection method of skin surface situation as described in claim 1, which is characterized in that the sensitive surface of the probe electrode
The grid electrode that product is equivalent to fixed dimension, is evenly distributed.
5. the detection method of skin surface situation as claimed in claim 2, which is characterized in that the measurement by capacitance circuit is also
Include keyboard and display, is separately connected the microprocessor.
6. the detection method of skin surface situation as claimed in claim 3, which is characterized in that the time of the capacitor charging is
3 to 5 times of RC.
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| CN106108287A (en) * | 2016-07-06 | 2016-11-16 | 张远海 | A kind of Intelligent bracelet with skin moisture test function |
| WO2018157369A1 (en) * | 2017-03-03 | 2018-09-07 | 蔡曜聪 | Physiological detection apparatus |
| CN108261127B (en) * | 2018-01-31 | 2021-12-14 | 深圳市米谷智能有限公司 | Control method and system of skin makeup instrument |
| CN109916971B (en) * | 2019-04-25 | 2022-05-17 | 云南中烟工业有限责任公司 | Rapid nondestructive testing method for fresh tobacco moisture based on capacitor |
| CN110188234A (en) * | 2019-05-31 | 2019-08-30 | Oppo广东移动通信有限公司 | Audio method for pushing and Related product |
| CN111595906B (en) * | 2020-05-08 | 2022-12-06 | 浙江恒逸石化研究院有限公司 | Low-cost method for detecting water content and oil content of fiber |
| CN111972787A (en) * | 2020-08-18 | 2020-11-24 | 西安鼎福十方网络智能科技有限公司 | Intelligent bioelectricity bracelet and use method thereof |
| CN112914576B (en) * | 2020-09-30 | 2024-03-22 | 世耳医疗科技(上海)有限公司 | Human body bioelectricity detection circuit, detection system and detection method |
| CN117045207B (en) * | 2023-10-13 | 2023-12-29 | 深圳汉威物联有限公司 | Pressure detection structure, skin moisture detector and detection method thereof |
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| KR100857180B1 (en) * | 2007-01-22 | 2008-09-05 | 삼성전자주식회사 | Skin hydration measuring apparatus for minimizing power consumption |
| CN103860169B (en) * | 2012-12-13 | 2017-01-18 | 广州大学城健康产业科技园投资管理有限公司 | Human skin moisture content detection device and system |
| CN104799856A (en) * | 2014-01-27 | 2015-07-29 | 杭州雪肌科技有限公司 | Tester for testing skin data |
| CN104799857A (en) * | 2014-01-27 | 2015-07-29 | 杭州雪肌科技有限公司 | Method for detecting comprehensive skin data |
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