CN106352957B - The preparation method of capacitance detector and the capacitance detector - Google Patents
The preparation method of capacitance detector and the capacitance detector Download PDFInfo
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- CN106352957B CN106352957B CN201610991335.3A CN201610991335A CN106352957B CN 106352957 B CN106352957 B CN 106352957B CN 201610991335 A CN201610991335 A CN 201610991335A CN 106352957 B CN106352957 B CN 106352957B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/12—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a solid body stressed by pressure or tension during weighing
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Abstract
The preparation method of capacitance detector and the capacitance detector is related to for the capacitance detector in tablet weighing device, in order to solve the problems, such as that existing weighing device low precision, volume be big and price.Capacitance detector includes the metal polar plate of at least two spaced sets along the vertical direction, is located in the middle plate dimensions minimum, is gradually increased to two sides；Number is that the pole plate of odd number is connected with conducting wire, as an output end；Number is that the pole plate of even number is connected with conducting wire, as another output；One group of silicagel column is equipped between two neighboring pole plate, two adjacent groups silicagel column inclined direction is opposite.The preparation method of above-mentioned capacitance detector is：Dimethyl silicone polymer is mixed with curing agent, as raw material；It uniformly drills on polyfluortetraethylene plate, then makes silicagel column in conjunction with pole plate using the template construct silicagel column as template.The capacitance detector precision is high, small in size, and production method is simple, quick and at low cost, is suitable for tablet weighing device.
Description
Technical field
The present invention relates to for the capacitance detector in tablet weighing device, belong to weighing-appliance field.
Background technique
In pharmacy, drug dispensing bottling is carried out usually using electronic balance.For the single patient in family or hospital, or only
Only the volunteer for participating in medicine test, it is not only inconvenient that everyone is equipped with an electronic balance, also uneconomical, and electronic balance without
Medication quantity writing function.In addition, using other existing electronic weighing devices carry out tablet weighing, device there are low precision,
The defect for quantity function that volume is big, expensive and no record is taken medicine.
Summary of the invention
Design of the invention aims to solve the problem that the problem of big existing weighing device low precision, volume and price.Now provide one
The preparation method of kind capacitance detector and the capacitance detector.
Capacitance detector of the present invention is a capacitor with multiple electrode plates sensor, and the capacitance detector includes at least two
A circular metal pole plate 1, the successively equidistant coaxial arrangement along the vertical direction of all pole plates 1, and number is followed successively by one to n, No.1
Pole plate 1 is identical as 1 size of n pole plate, and No. two pole plates 1 are identical as 1 size of n-1 pole plate, No. three pole plates 1 and n-2 pole plate 1
Size is identical, and so on；It is minimum to be located in the middle 1 size of pole plate, is gradually increased from centre to 1 size of two sides pole plate；It is all
Number is that the pole plate 1 of odd number is connected using conducting wire, and a signal output end as the capacitance detector；All numbers
It is connected for the pole plate 1 of even number using conducting wire, and another signal output end as the capacitance detector；Per adjacent two
One group of silicagel column 2 is provided between a pole plate 1, and the individual in every group of silicagel column 2 is tilted and is equidistantly arranged in parallel, it is same
The individual inclined direction of group silicagel column 2 is identical, and the inclined direction of two adjacent groups silicagel column 2 is opposite；The capacitor with multiple electrode plates sensing
Device is used to be applied to the difference of power on pole plate 1 according to tablet and generates the capacitance signal of variation.
The preparation method of above-mentioned capacitance detector, which is characterized in that include the following steps：
Step 1: choosing multiple circular metal polar plates 1；
Step 2: preparing mixed liquor：Dimethyl silicone polymer and curing agent are pressed 10：1 ratio is uniformly mixed, and is mixed
Liquid；
Step 3: production template：Uniformly drill on one piece of polyfluortetraethylene plate, it is stand-by as template, the axis in hole with
The angle of polyfluortetraethylene plate plate face is 45 degree；
Step 4: production silicagel column 2：Template is put into culture dish, while smearing release agent in template surface, will be mixed
Liquid pours into the template in culture dish, makes in the uniform inflow hole of mixed liquor, and mixed liquor will cover template surface, and culture dish is put
Enter in vacuum oven and vacuumize, lies in a horizontal plane on warm table after heating one hour and demould after taking-up, obtain one group of silicagel column
2, it repeats to obtain n-1 group silicagel column 2 process n-1 times；
Step 5: pole plate 1 is combined with silicagel column 2：N-1 group silicagel column 2 and 1 surface of n-1 pole plate in step 1 is same
When processing it is clean, and be put into plasma apparatus be surface-treated together, then by every group of silicagel column 2 and 1 table of pole plate
Face is combined closely, and the combination of n-1 pole plate 1 and silicagel column 2 is formed；
Step 6: the superposition of two pole plates 1：One pole plate 1 is put into culture dish, in the pole plate 1 without silicagel column 2
Mixed liquor is uniformly dripped on surface, takes out the combination of a pole plate 1 and silicagel column 2, and the silicagel column 2 in the combination is placed on
Drop has 1 surface of pole plate of mixed liquor, which is placed on warm table and is heated, the superposition of two pole plates 1 is completed, using same
Method complete n pole plate 1 superposition, obtain the capacitance detector.
Beneficial effect：
The pole plate 1 that above-mentioned capacitance detector is located at top layer is identical with 1 diameter of pole plate positioned at bottom, upper several second layer pole plates
1 is identical with the diameter of lower second pole plate 1 of number, and upper several third layer pole plates 1 are identical with the diameter of lower several third pole plates 1 ...,
And the diameter of top layer pole plate 1 is greater than the diameter of upper several second layer pole plates 1, and the diameters of upper several second layer pole plates 1 is greater than upper number the
The diameter ... of three layers of pole plate 1, i.e., from centre to two sides, 1 diameter of pole plate is in incremental variations.It is carried out using this size and structure
Arrangement, when capacitance detector carries out weighing operation, number is that the pole plate 1 of odd number is not in relative horizontal displacement.In addition, compiling
Number for even number pole plate 1 in the horizontal direction will not exceed the maximum pole plate 1 of upper and lower area, movement will not because contact ambient
Body and be limited.In the capacitor with multiple electrode plates sensor, the function of silicagel column 2 is equivalent to spring, and all in every layer of silicagel column 2
Body forms an angle with pole plate and is equidistantly arranged in parallel, and 2 inclination direction of silicagel column of adjacent two layers is opposite.Therefore, this hair
Medicine bottle in turn avoided the shortcomings that uprighting spring easily causes rigidity to be mutated without lateral displacement when bright structure both ensure that weighing.It adopts
Weighing record is carried out with the structure of the capacitance detector of the application, has high sensitivity, detection accuracy strong, low in cost etc. excellent
Point.Verified, using the capacitance detector of five pole plates, average sensitivity can reach 23.06mV/g.
Tablet weighing device based on above-mentioned capacitance detector has sensitivity using capacitance detector as core devices
High, the advantages that detection accuracy is strong, low in cost.
The preparation method of above-mentioned capacitance detector is simple, quick and at low cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of capacitor with multiple electrode plates sensor in embodiment one；
Fig. 2 is the schematic diagram of the section structure of one Chinese medicine tablet weighing device of embodiment, and 3 expression converters in figure, being used for will
The capacitance signal that capacitance detector generates is converted into voltage signal；
Fig. 3 is the relation curve of initial distance between capacitance and pole plate in embodiment one；
Fig. 4 is voltage-weight distribution curve of five kinds of capacitance detectors in embodiment two, wherein 4 be copper polar plate hairspring,
5 be quadripolar plate copper bulky spring, and 6 be copper polar plate bulky spring, and 7 indicate that aluminum substrate carefully dredges spring, and 8 indicate copper polar plate carefully short spring；
Fig. 5 is the Sensitivity comparison figure of the five pole plate copper capacitors and quadripolar plate copper capacitor in embodiment two, 9 expressions in figure
Five pole plate copper capacitors, 10 indicate quadripolar plate copper capacitor；
Fig. 6 is the functional block diagram of three Chinese medicine tablet weighing device of embodiment；
Fig. 7 is the circuit diagram of the converter in embodiment three；
Fig. 8 is the overlooking structure diagram in embodiment three for the tablet weighing device of single medicine bottle weighing；
Fig. 9 is the overlooking structure diagram in embodiment three for the tablet weighing device of multiple medicine bottles weighing.
Specific embodiment
Specific embodiment one：Present embodiment, the inspection of capacitor described in present embodiment are illustrated referring to figs. 1 to Fig. 3
It surveys device to be applied in tablet weighing device, the capacitance detector is a capacitor with multiple electrode plates sensor, the capacitance detector
Including at least two circular metal pole plates 1, the successively equidistant coaxial arrangement along the vertical direction of all pole plates 1, and number is followed successively by
One to n, No.1 pole plate 1 is identical as 1 size of n pole plate, and No. two pole plates 1 are identical as 1 size of n-1 pole plate, No. three pole plates 1 and n-
The size of No. 2 pole plates 1 is identical, and so on；It is minimum to be located in the middle 1 size of pole plate, gradually from centre to 1 size of two sides pole plate
Increase；All numbers are that the pole plate 1 of odd number is connected using conducting wire, and is exported as a signal of the capacitance detector
End；All numbers are that the pole plate 1 of even number is connected using conducting wire, and is exported as another signal of the capacitance detector
End；Per being provided with one group of silicagel column 2 between two adjacent pole plates 1, and the inclination of the individual in every group of silicagel column 2 and equidistant
It is arranged in parallel, the individual inclined direction of same group of silicagel column 2 is identical, and the inclined direction of two adjacent groups silicagel column 2 is opposite；It is described more
Plates capacitance sensor is used to be applied to the difference of power on pole plate 1 according to tablet and generates the capacitance signal of variation.
1, the selection of pole plate 1
The material of the pole plate 1 of capacitance sensor should have that light-weight, intensity is high, conductivity is high and the characteristics such as cheap.
Various metals are compared, copper is preferred material.Compared with copper, aluminum material has intensity higher, again in addition to conductivity is slightly lower
Lighter advantage is measured, also can be used as a kind of selection.Since plate thickness does not influence capacitance, we plate designs are obtained it is thin as far as possible, only
Intensity is wanted to meet the requirements.In fact, the product in future is it is even possible that make pole with the lighter plastics of weight or glass
Plate, only by plated with conductive material on its surface.
In addition, in order to weaken influence of the positive area variation to capacitance, as shown in Figure 1, we carry out the structure of pole plate
Special designing, so that the difference of adjacent plate radius isWhen capacitance sensor work, the horizontal moving ranges of any plate
All without departing from the edge of adjacent panels.There are two advantage, one side capacitors to be influenced too by positive area variation for this structure
More, on the other hand first and third, five pole plates are not in relative displacement.In addition, second, quadripolar plate will not be beyond maximum up and down
The pole plate of area, movement will not be limited because contacting surrounding objects.
2, between pole plate spring selection
It is elasticity that elastic column material between pole plate should have, repeatability, the long-life, small in size and cheap etc. excellent
Point.Since metal spring easily causes short circuit and easily leads to change in dielectric constant, because without selecting to use.
To avoid easily causing rigid the shortcomings that being mutated, we use 45 degree of angles using vertical spring column between adjacent copper sheet
Inclined elastic is as the spring between pole plate.When realizing weighing operation using capacitor with multiple electrode plates sensor, meeting between adjacent plate
It relatively moves.Using the contrary setting of two adjacent groups elastic spring as shown in Figure 1, interlayer spring direction is identical
Arrangement architecture, when weighing device can be enabled to work, number be odd number pole plate 1 between without relative displacement.This structure both ensure that weighing
When medicine bottle without lateral displacement, in turn avoid using vertical spring column easily cause rigidity be mutated the shortcomings that.
3, quantity of polar plate selects
The sensitivity analysis of capacitance sensor：
Capacitance value C can be expressed as follows with geometric parameter and dielectric constant：
The unit of capacitance C is farad (F) herein.εrIt is the dielectric constant of material between pole plate, ε0It is permittivity of vacuum.A
It is the positive area of pole plate, unit is square metre.D is the distance between two-plate, and unit is rice.
The sensitivity of one sensor reflects output valve with the variable quantity of measurement parameter.Our spirits capacitance sensor
Sensitivity is defined asHere △ G is weighing weight, and △ C is the corresponding change amount of capacitance, and the unit of sensitivity S is F/
g。
For weighing sensor, other than pole plate distance d, it is assumed that every other parameter constant.Capacitor's capacity table
Show as follows：
Here d0It is initial distance, △ d is the variable quantity for increasing distance change with load.In this way, the opposite variation of capacitor
Amount is：If (△ d/d0)<<1,Can with Taylor expansion at：
If omitting high-order term, formula (4) can be obtained,
If △ G is the weight of a tablet, the coefficient of elasticity of K material between pole plate, △ d is distance between polar plate with being placed on pole
The variation of a medicine on plate, then △ G=K △ d.To which capacitor may be defined as with the sensitivity that tablet fill weights change：
It is assumed that A and εrIt keeps constant, then sensitivity S and coefficient of elasticity K and initial distanceIt is inversely proportional.
If only retaining the first order and quadratic term in Taylor expansion, formula (6) can be obtained：
Thus, if equation (5) is used for meter sensitivity, relative non-linear error efFor：
As shown in Fig. 3 (a), when K is remained unchanged,Smaller, capacitor is more sensitive.By scheming it can be seen from (b) only as △ d/
d0When smaller, △ d/d0With △ C/C0Between just there is approximate linear relationship, this is beneficial to weigh.To mean elasticity
COEFFICIENT K should not be designed too small.
By above discussion it is found that the initial spacing d of pole plate0Smaller, capacitor is more sensitive.But if cause apart from too small
Range becomes smaller, while short circuit easily occurs.Therefore, on the one hand, in order to increase sensitivity, pole plate initial distance should be designed as far as possible
Small, on the other hand, pole plate spacing will meet the range request that weighs.
By above discussion it is found that coefficient of elasticity K is inversely proportional with sensitivity S, thus, survey can be increased by reducing coefficient of elasticity K
Sensitivity S is measured, but can also range be caused to reduce simultaneously, in addition, can also cause between △ C and △ d obviously nonlinear dependence
System.Therefore coefficient of elasticity appropriate should be selected.
To solve the contradiction between sensitivity and measuring range, and the linear relationship kept as far as possible, we select to make
With capacitor with multiple electrode plates sensor.Capacitor with multiple electrode plates calculation formula is：
Here n is pole plate number.To not change elastic material elasticity system between initial distance, pole plate positive area and pole plate
In the case where number, the capacitance of capacitor with multiple electrode plates is (n-1) times of two-plate capacitor's capacity.Therefore, the sensitivity of capacitor with multiple electrode plates
Also become (n-1) times of two-plate capacitance sensitivity.
Specific embodiment two：Illustrate that present embodiment, present embodiment are to one institute of embodiment in conjunction with Fig. 4 and Fig. 5
The capacitance detector stated is described further, and in present embodiment, the capacitance detector is five plates capacitance sensors.Five
Plates capacitance sensor pole plate numbers be followed successively by 1,2,3,4 and 5 from top to bottom, wherein 1 is identical with 5 size, is2 is identical with 4 sizes, isThe size of No. 3 pole plates isAs shown in Figure 1, if plate spacing is h, adjacent plate semidiameter is its size relationshipIt adopts
Because pole plate positive area changes due to the influence caused by capacitance when with the size assortment being to reduce working sensor.
Compare by testing repeatedly, the measurement for selecting five kinds of typical capacitance sensors to carry out tablet quantity is compared.Table 1 arranges
The parameter and measurement sensitivity of five kinds of capacitance sensors are gone out.As shown in figure 4, wherein curve 5 is quadripolar plate capacitor, other curves
It is two plates capacitances.Relation curve when five kinds of capacitance measurements between tablet quantity and output voltage is different, when measurement
Maximum tablet quantity is 100, every tablet weight 1.35g, output voltage signal variation range -2.5-2.5V, Wo Menyong
Its range is adjusted to 0-5V by MATLAB.It can be seen from the figure that the slope of copper sheet carefully short spring capacitance detector is minimum, copper polar plate
Bulky spring capacitance detector slope is slightly larger, the maximum slope of copper polar plate hairspring capacitance detector, but the curve reaches rapidly survey
Measure the upper limit of voltage range.The curve of quadripolar plate copper bulky spring capacitance detector is best, and not only slope is larger, and its end is not
It can be more than the upper limit of measurement voltage range.Since spring is meticulous very few, the effect that aluminum substrate carefully dredges spring capacitance detector is worst.
Mapping relations one by one between tablet quantity and output voltage are complicated.For a specific capacitor, with medicine
Corresponding change, Jie of material between the variation size and coefficient of elasticity K, pole plate of capacitance occur for the variation of the piece number amount, capacitor plate spacing
Electric constant εrIt is all related to the positive area A of pole plate.In addition, being also complicated by the process that capacitance signal is converted into voltage signal
's.Therefore, absolute linear relationship is not had to exist between tablet quantity and output voltage, this is also just explained in Fig. 4 and Fig. 5
Curve shape.However, good one-to-one relationship and big slope are beneficial to weigh.
From Fig. 4 it can further be seen that sensitivity S ' variation with the variation of tablet quantity.In table 1, we indicate flat with S '
Equal sensitivity.It can be seen that most sensitive in table 1 is quadripolar plate capacitance sensor.Its average sensitivity 19.63mV/g.From Fig. 4
With Fig. 5 it will be seen that entire voltage change range should make full use of to measure tablet quantity.Swertia Tablet quality determines
When, we can increase the variation range of capacitance values by the quantity or size of PDMS spring between reduction pole plate.
The average sensitivity of the different capacitance sensors of table 1
From Fig. 4, it will also be appreciated that, the sensitivity of the harder capacitance sensor of spring is poorer, and the slope of curve is smaller, to the greatest extent
Range is larger at this time for pipe.On the contrary, spring is softer, capacitance sensor is more sensitive, and the slope of curve is bigger.Therefore, aluminum substrate carefully dredges bullet
Spring capacitance curve is worst, and copper polar plate bulky spring capacitor is preferable, and quadripolar plate copper bulky spring capacitance curve is best.
For capacitance sensor, the initial spacing of short pole plate, thin and few spring, big polar plate area and big plate
Between material dielectric constant will will increase sensitivity.And for subsequent conditioning circuit, big amplification factor will enable output signal to tablet
Quantity variation is more sensitive.However, more sensitive capacitor is easier to reach measuring limit, and circuit amplification factor is bigger, output electricity
Pressure is easier to reach the upper limit.
Therefore, should compromise between sensibility and wide range.A kind of perfect condition is, capacitor is wanted meeting range
When asking, capacitance variation range is consistent with the output voltage range of circuit, i.e., reaches maximum value and minimum value simultaneously.
Fig. 5 show voltage-weight distribution curve figure of five pole plate copper capacitors Yu quadripolar plate copper capacitor, it can be seen that sensitive
Degree aspect, five plates capacitance outlines are better than quadripolar plate capacitor.Using five pole plate copper capacitance sensors, one group of experiment is repeated.Table 2 is
Voltage and dose relationship when five pole plate copper capacitance measurement tablets, tablet quantitative range are 1-100, and voltage change range is
57mV-3170mV.It is measured using five pole plate copper capacitance sensors, average sensitivity reaches 23.06mV/g.
The corresponding relationship of table 2 voltage and tablet quantity
Specific embodiment three：Illustrate that present embodiment, present embodiment are based on embodiment one in conjunction with Fig. 6 to Fig. 9
The tablet weighing device of the capacitance detector, the tablet weighing device include capacitance detector, converter, computing module and
Display, converter are used to convert the capacitance signal that capacitance detector generates to voltage signal, and computing module is used for according to electricity
The voltage signal is calculated as the weight of tablet by the relationship of pressure and weight, and weight signal is sent to display and is shown
Show.
The converter includes ± 2.5V power supply, transformer T, reference capacitance C0, resistance R1, resistance R2, resistance R3, resistance
R4, slide rheostat Rf1, slide rheostat Rf2, slide rheostat Rf3, operational amplifier v0, operational amplifier v1, operation amplifier
Device v2, operational amplifier v3, diode D1, diode D2, diode D3, diode D4, electric capacity of voltage regulation C1With electric capacity of voltage regulation C2, ±
2.5V power supply connects capacitance detector C simultaneouslyxAn output end and reference capacitance C0One end, capacitance detector CxIt is another
A output end connects resistance R simultaneously1One end and operational amplifier v0Inverting input terminal connection, operational amplifier v0Positive
Input terminal connects power ground, operational amplifier v0Output end connect resistance R simultaneously1The other end and resistance R3One end, resistance
R3The other end connect slide rheostat R simultaneouslyf1One end and operational amplifier v2Normal phase input end, operational amplifier v2's
Output end connects one end of the primary coil of transformer T, slide rheostat R simultaneouslyf2One end and slide rheostat Rf2Sliding
The other end at end, the primary coil of transformer T connects power ground, slide rheostat Rf2The other end connect operational amplifier simultaneously
v2Inverting input terminal and resistance R4One end, resistance R4The other end connect resistance R simultaneously2One end and operational amplifier v1's
Output end, operational amplifier v1Positive input connect power ground, operational amplifier v1Reverse input end connect resistance simultaneously
R2The other end and reference capacitance C0The other end, operational amplifier v3Output end as voltage signal output end.
As shown in fig. 6, converting the capacitance signal of variation to using converter the voltage signal of variation, then, output
Voltage signal is sent to display, while can also be transmitted on mobile phone or computer terminal by bluetooth.
In present embodiment, the capacitance of capacitance sensor only has several pico farads, and with electricity caused by the variation of tablet quantity
Holding variation can be smaller, and vulnerable to environmental disturbances.In addition, a very small variation is difficult measuring by common LCR table
It arrives, and highly sensitive instrument is only used for laboratory.To which we can only use highly sensitive interface circuit as substitution.
As shown in figure 5, we devise one based on adjustable reference capacitor for the capacitance variations of detection symbol medicine bottle Chinese medicine tablet quantity
Interface circuit, here, CxAnd C0Respectively represent measured capacitance (i.e. the capacitance of capacitance detector output) and reference capacitance.It uses
Voltage change range is ± 2.5V, the input signal V that frequency is 100kHzin.Capacitance is converted letter by the differentiator of front end two
Number amplitude, further uses a difference amplifier and extracts and amplify the difference of two signals.When in medicine bottle without tablet, C0It can be used as
The initial value of capacitance sensor, thus V when in medicine bottle without medicineout1Equal to 0.It is usually whole with common bridge-type in order to measure conveniently
Device is flowed by AC signal Vout1It is converted into direct current.
Tablet weighing device only can include a capacitance detector (as shown in Figure 8) can also for measuring single medicine bottle
With comprising multiple capacitance detectors (as shown in Figure 9), for measuring multiple medicine bottles.When comprising multiple capacitance detectors, each
Capacitance detector is equipped with a converter.
Tablet weighing device described in present embodiment using capacitance detector be used as core devices, with high sensitivity,
The advantages that detection accuracy is strong, low in cost.
Specific embodiment four：Present embodiment is the preparation method of capacitance detector described in embodiment one, the party
Method includes the following steps：
Step 1: choosing multiple circular metal polar plates 1；
Step 2: preparing mixed liquor：Dimethyl silicone polymer and curing agent are uniformly mixed in 10: 1 ratios, mixed
Liquid；
Step 3: production template：Uniformly drill on one piece of polyfluortetraethylene plate, it is stand-by as template, the axis in hole with
The angle of polyfluortetraethylene plate plate face is 45 degree；
Step 4: production silicagel column 2：Template is put into culture dish, while smearing release agent in template surface, will be mixed
Liquid pours into the template in culture dish, makes in the uniform inflow hole of mixed liquor, and mixed liquor will cover template surface, and culture dish is put
Enter in vacuum oven and vacuumize, lies in a horizontal plane on warm table after heating one hour and demould after taking-up, obtain one group of silicagel column
2, it repeats to obtain n-1 group silicagel column 2 process n-1 times；
Step 5: pole plate 1 is combined with silicagel column 2：N-1 group silicagel column 2 and 1 surface of n-1 pole plate in step 1 is same
When processing it is clean, and be put into plasma apparatus be surface-treated together, then by every group of silicagel column 2 and 1 table of pole plate
Face is combined closely, and the combination of n-1 pole plate 1 and silicagel column 2 is formed；
Step 6: the superposition of two pole plates 1：One pole plate 1 is put into culture dish, in the pole plate 1 without silicagel column 2
Mixed liquor is uniformly dripped on surface, takes out the combination of a pole plate 1 and silicagel column 2, and the silicagel column 2 in the combination is placed on
Drop has 1 surface of pole plate of mixed liquor, which is placed on warm table and is heated, the superposition of two pole plates 1 is completed, using same
Method complete n pole plate 1 superposition, obtain the capacitance detector.
It is elastic material should have many advantages, such as between pole plate elasticity, repeatability, the long-life, small in size and cheap.We
Choosing then makes spring using dimethyl silicone polymer (PDMS).The PDMS of liquid is a kind of colourless, tasteless, nontoxic viscous fluid
Body, while having and stablizing nonflammable inert fluid, it is often referred to as silicone oil.When solid-state, PDMS is a kind of transparent bullet
Property silicone grease, there are the characteristics such as nontoxic, hydrophobic, waterproof and inertia.In addition, solid PDMS is nonflammable, compatibility is good, optics is clear
It is clear, easily in conjunction with a variety of materials.Since Young's modulus is lower, solid-state PDMS has high-elastic characteristic.
The application field of PDMS is related to sealing, lubrication, touch screen and chest implant etc., low-shrinkage and reusable
Property makes it suitable for soft light carving technology.
The process flow for the production capacitance detector that present embodiment proposes is simple, quick and at low cost.
In the process flow, host agent and curing agent press 10：1 mixing.By vacuumizing, air bubble floats to mixed liquor table
Face rupture.Mixed liquor is heated to 120 degree Celsius using warm table or baking oven, as soon as and keep the temperature hour, obtained solid
PDMS。
Plasma (Plasma) is a kind of state of matter, is mainly made of, is widely present free electron and charged ion
It is often considered as the 4th kind of state of substance in cosmic space.The conductivity of Plasma is very high, itself is both inclusions
Reason includes the electroneutral mixture of chemical activity particle again.These particles moveing freely can do chemical function.And charge atom
With particle physics function can be done by doing sputtering.By physical bombardment and chemical reaction, Plasma technique can realize a variety of materials
Surface modification, including surface activation, pollutant removal, plasma etching etc..
When handling surface using Plasma device, capacitor plate and PDMS elastic material can tightly be sticked together.
Claims (4)
1. capacitance detector is a capacitor with multiple electrode plates sensor, the capacitance detector includes at least two circular metal pole plates
(1), all pole plates (1) successively equidistant coaxial arrangement along the vertical direction, and number is followed successively by one to n and n more than or equal to 3；
No.1 pole plate (1) is identical as n pole plate (1) size, and No. two pole plates (1) are identical as n-1 pole plate (1) size, No. three poles
Plate (1) is identical as the size of n-2 pole plate (1), and so on；It is located in the middle pole plate (1) size minimum, from centre to two sides
Pole plate (1) size is gradually increased；
All numbers are that the pole plate (1) of odd number is connected using conducting wire, and is exported as a signal of the capacitance detector
End；All numbers are that the pole plate (1) of even number is connected using conducting wire, and is exported as another signal of the capacitance detector
End；
It is provided with one group of silicagel column (2) between per two adjacent pole plates (1), and the individual in every group of silicagel column (2) tilts
And be equidistantly arranged in parallel, the individual inclined direction of same group of silicagel column (2) is identical, the inclination side of two adjacent groups silicagel column (2)
To opposite；
The capacitor that the capacitor with multiple electrode plates sensor is used to be applied to the difference of power on pole plate (1) according to tablet and generates variation is believed
Number；
The preparation method of capacitance detector, which is characterized in that include the following steps：
Step 1: choosing multiple circular metal polar plates (1)；
Step 2: preparing mixed liquor：Dimethyl silicone polymer and curing agent are pressed 10：1 ratio is uniformly mixed, and obtains mixed liquor；
Step 3: production template：It uniformly drills on one piece of polyfluortetraethylene plate, the axis in hole and poly- four stand-by as template
The angle of vinyl fluoride plate plate face is 45 degree；
Step 4: production silicagel column (2)：Template is put into culture dish, while smearing release agent in template surface, by mixed liquor
It pours into the template in culture dish, makes in the uniform inflow hole of mixed liquor, and mixed liquor will cover template surface, and culture dish is put into
It is vacuumized in vacuum oven, lies in a horizontal plane on warm table after heating one hour and demould after taking-up, obtain one group of silicagel column
(2), it repeats to obtain n-1 group silicagel column (2) process n-1 times；
Step 5: pole plate (1) and silicagel column (2) combine：By n-1 pole plate (1) table in n-1 group silicagel column (2) and step 1
Face is handled completely simultaneously, and is put into plasma apparatus is surface-treated together, then by every group of silicagel column (2) and a pole
Plate (1) surface is combined closely, and the combination of n-1 pole plate (1) and silicagel column (2) is formed；
Step 6: the superposition of two pole plates (1)：One pole plate (1) is put into culture dish, does not have silicagel column in the pole plate (1)
(2) mixed liquor is uniformly dripped on surface, takes out the combination of a pole plate (1) and silicagel column (2), by the silica gel in the combination
Column (2) is placed on pole plate (1) surface that drop has mixed liquor, which is placed on warm table and is heated, two pole plates (1) are completed
Superposition, using same method complete n pole plate (1) superposition, obtain the capacitance detector.
2. capacitance detector according to claim 1, which is characterized in that the tilt angle phase of two adjacent groups silicagel column (2)
Together.
3. capacitance detector according to claim 1 or 2, which is characterized in that pole plate (1) quantity is five.
4. capacitance detector according to claim 1 or 2, which is characterized in that connection use of pole plate and silicagel column (2) etc.
Gas ions process for treating surface is bonded.
Priority Applications (1)
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| CN2313215Y (en) * | 1997-06-26 | 1999-04-07 | 胡耿 | Laminated-capacitor type force-sensitive sensor |
| CN1388364A (en) * | 1995-07-28 | 2003-01-01 | 日本代纳马特株式会社 | Pressure sensor |
| CN1841594A (en) * | 2005-03-28 | 2006-10-04 | Tdk株式会社 | Multilayer electronic component and manufacturing method thereof |
| CN101019196A (en) * | 2004-10-13 | 2007-08-15 | 松下电器产业株式会社 | Production method for laminated ceramic electronic components and production device therefor |
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| DE60126511T2 (en) * | 2000-12-14 | 2007-11-15 | Hi-Scan Technology Pty. Ltd. | WEIGHT SENSOR |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1388364A (en) * | 1995-07-28 | 2003-01-01 | 日本代纳马特株式会社 | Pressure sensor |
| CN2313215Y (en) * | 1997-06-26 | 1999-04-07 | 胡耿 | Laminated-capacitor type force-sensitive sensor |
| CN101019196A (en) * | 2004-10-13 | 2007-08-15 | 松下电器产业株式会社 | Production method for laminated ceramic electronic components and production device therefor |
| CN1841594A (en) * | 2005-03-28 | 2006-10-04 | Tdk株式会社 | Multilayer electronic component and manufacturing method thereof |
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