CN109341909A - A kind of multifunction flexible strain gauge - Google Patents
A kind of multifunction flexible strain gauge Download PDFInfo
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- CN109341909A CN109341909A CN201811379889.3A CN201811379889A CN109341909A CN 109341909 A CN109341909 A CN 109341909A CN 201811379889 A CN201811379889 A CN 201811379889A CN 109341909 A CN109341909 A CN 109341909A
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- polymer
- laminated film
- anisotropic conductive
- conducting resinl
- brittle
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
Abstract
The invention discloses a kind of multifunction flexible strain gauges, comprising: brittle polymer anisotropic conductive laminated film, conducting wire and elastomeric polymer；Elastomeric polymer embeds the brittle polymer anisotropic conductive laminated film for being attached to conducting resinl, and elastomeric polymer is exposed in one end that conducting resinl is not contacted with brittle polymer anisotropic conductive laminated film；Close contact between brittle polymer anisotropic conductive laminated film and elastomeric polymer, gapless.A kind of multifunction flexible strain gauge of the present invention, can detect multiaxis complex stress, have many advantages, such as a variety of stress modes of detection, also with water-fast and various chemical reagent, light weight and small in size；In addition, multifunction flexible strain gauge preparation process is simple, have a good application prospect.
Description
Technical field
The present invention relates to strain gauge technical field, in particular to a kind of multifunction flexible strain gauge.
Background technique
With the fast development of artificial intelligence, flexible electronic has more and more wide in fields such as information, the energy and medical treatment
Application prospect.Flexibility stress sensor is the variation that the deformation of sensor is converted to resistance value, is subject to obtaining it
Stress intensity.But existing flexibility stress sensor often has a single function, for example, being only capable of the stress intensity of test known direction.
To some complex stresses, such as the cranking arm of human body, the identification of walk muscular movement and joint motions, it is often specific according to this
The serial variation tendency of caused resistance value is moved to record the motor pattern, it is difficult to obtain and realize in this motion process
The specific size of each stress and direction.Therefore, be badly in need of it is a kind of with to Multiaxial stress and meanwhile detection it is multi-functional, integrated
Strain gauge, to realize detection to complex stress.
Summary of the invention
Have a single function existing for the existing flexibility stress sensor, without quantitative analysis complex stress aiming at the problem that, this hair
Bright to propose a kind of multifunction flexible strain gauge, which can detect multiaxis complex stress, has and detects a variety of stress
The conversion way of output of the function of mode, electric signal and stress is simple, also has water-fast and various chemical reagent, light weight and body
The advantages that product is small；In addition, multifunction flexible strain gauge preparation process is simple, have a good application prospect.
A kind of multifunction flexible strain gauge, comprising:
Brittle polymer anisotropic conductive laminated film, the brittle polymer anisotropic conductive laminated film include
Upper layer brittle polymer anisotropic conductive laminated film and lower layer's brittle polymer anisotropic conductive laminated film, the two are flat
Row is orthogonal to be stacked, and 1000 μm of spacing；
Conducting resinl, the conducting resinl include the first conducting resinl, the second conducting resinl, third conducting resinl and the 4th conducting resinl；Its
In, the first conducting resinl and the second conducting resinl are attached to the upper surface of upper layer brittle polymer anisotropic conductive laminated film,
Line is parallel with the smallest direction of conductivity of upper layer brittle polymer anisotropic conductive laminated film；Third conducting resinl and
Four conducting resinls are attached to the lower surface of lower layer's brittle polymer anisotropic conductive laminated film (12), line and lower layer's brittleness
The smallest direction of conductivity of polymer anisotropic conductive laminated film is parallel；
Elastomeric polymer, the elastomeric polymer is to the brittle polymer anisotropic conductive THIN COMPOSITE for being attached to conducting resinl
Film is embedded, and flexible polymer is exposed in one end that conducting resinl is not contacted with brittle polymer anisotropic conductive laminated film
Object；
Close contact between the brittle polymer anisotropic conductive laminated film and elastomeric polymer, gapless.
Further, the electrical anisotropy degree of the brittle polymer anisotropic conductive laminated film 1~7 it
Between, conductivity is between 100~4000S/cm in principal direction.
Further, the difference of the electrical anisotropy degree of the brittle polymer anisotropic conductive laminated film,
Fitting result between stress and the electric signal of measurement is different.
Further, the shape of the brittle polymer anisotropic conductive laminated film is not limited to rectangle, and elasticity is poly-
The area for closing object (3) is greater than the area of the brittle polymer anisotropic conductive laminated film, and elastomeric polymer can be completely
The brittle polymer anisotropic conductive laminated film is covered, the shape of elastomeric polymer is also not limited to rectangle.
Further, the integral thickness of the elastomeric polymer is between 500~2000 μm.
Further, the upper surface of the upper layer brittle polymer anisotropic conductive laminated film and elastomeric polymer
Distance is between 50~1500 μm.
Further, the thickness of the brittle polymer anisotropic conductive laminated film is between 5~30 μm.
Further, the action mode of the stress of the multifunction flexible strain gauge detection is not limited to perpendicular to it
The pressure on surface, can also be and deflect power outside face.
Further, the material of the elastomeric polymer is dimethyl silicone polymer, the brittle polymer anisotropy
The material of conductive composite film is polyaniline/argentum nano line.
As a kind of conducting polymer, conductive filler such as carbon of the polyaniline film through protonic acid doping or the certain content of addition
Nanotube, graphene, metal nano material etc., conductivity can be 10-6~104Between S/cm.This is because being managed according to threshold value
By, when distance sufficiently small (being greater than electron tunneling distance) between adjacent conductive filler, can overlap to form conductive path, from
And promote the electric property of polyaniline film.Particularly, when conductive filler is to fill out with anisotropic one-dimensional or two-dimentional conduction
When material, the ordered arrangement under stress or field inductive condition can assign polyaniline film with the anisotropy of electricity.Herein,
Define film in different directions conductivity ratio be its electricity anisotropic degree.In the feelings of conductive filler ordered arrangement
Under condition, when polyaniline matrix by stress deformation occurs when, in filler orientation direction (referred to as principal direction), due to conductive path
It is more, thus the displacement of some fillers is smaller on the influence of the connection status of conductive path in this direction, therefore resistance variations are smaller；And
On perpendicular to filler orientation direction (referred to as secondary direction), since conductive path is less, thus the connection status between filler by
It is affected to what filler shifted, or even will cause all off of conductive path in this direction, sharply increase so as to cause resistance
Greatly.On the other hand, due to the strain very different of dimethyl silicone polymer and polyaniline, the former is close to 600%, and the latter is only
Be 2% or so, the two strain greatest differences can promote polyaniline laminated film by by dimethyl silicone polymer transmitting Lai
Stress when, along the direction that stress is concentrated, i.e., crackle occurs for filler orientation direction (principal direction), and the fracture of this matrix will be into
One step amplifies the change of principal direction and power to power on signal.The present invention is by using by the polyaniline of two anisotropic conductives
Laminated film carries out flexible conductive layer of the orthogonal superposition as uncoupling, to substitute the identical conductive layer of traditional conductivity.Pool
Loose ratio is material in proportional limit, and the transverse strain as caused by equally distributed longitudinal stress is exhausted with the ratio between longitudinal strain
To value.Due to Poisson's ratio, so that the uniform conductive layer of traditional conductivity is in the stress by unknown direction, telecommunications
Number variation and deformation do not have simple relevance, thus be only used for test known direction stress intensity, it is difficult to analysis it is more
Axis complex stress.
The present invention uses the laminated film of two anisotropic conductives of Orthogonal Composite as conductive layer, due to laminated film
Conductivity is significantly higher than the upward conductivity of power in principal direction, after Orthogonal Composite, can substantially reduce whole Poisson
Than, thus can approximation be considered as zero Poisson ratio, therefore can be used as an orthogonal phasor coordinate system to decompose multiaxis complex stress.
It, can first will be in the principal direction of strain partitioning to two orthogonal laminated films in sensor by complex stress and when deformation occurs
(being denoted as X-direction and Y-direction), according to the variation of X-direction and Y-direction power on signal, then inverse composition complex stress size and
Direction, thus can be used as a kind of flexible sensor for detecting a variety of stress modes.
A kind of multifunction flexible strain gauge proposed by the present invention, the sensor can detecte multiaxis complex stress, packet
It includes pressure and deflects a variety of stress modes such as power and obtain vector, and there is water-fast and various chemical reagent, light weight, volume
Small, structure and the simple advantage of preparation method, thus in intelligent medical treatment, for example, to the real-time monitoring of physical activity, wearable set
Standby, electronic skin etc. has significant application value.
The present invention provides a kind of multifunction flexible strain gauges, have the function of a variety of stress modes of detection.With it is existing
There is technology to compare, the invention has the benefit that
(1) the multifunction flexible strain gauge is used as by using the electrical anisotropy laminated film of Orthogonal Composite and goes
The deformation that complex stress generates can be decomposed two orthogonal directions, by two orthogonal directions by the phasor coordinate system of coupling
The variation of electric signal, can inverse composition stress direction and size, thus have the function of detect multiaxis complex stress, thus pole
The use scope of traditional strain gauge has been widened greatly.
(2) main material of the multifunction flexible strain gauge is polyaniline and dimethyl silicone polymer, has material
The advantages of being easy to get and be at low cost, thickness is thin, light weight, while its structure and preparation process are simple, can be mass.
(3) variation of resistance value of sensor and size/angle of stress meet linear relationship in the present invention, and return system
Number is high, significantly simplifies the conversion output between strain and electric signal, practicability and strong operability.
Detailed description of the invention
Fig. 1 is the upper surface schematic diagram of sensor in embodiment 1；
Fig. 2 is the lower surface schematic diagram of sensor in embodiment 1；
Fig. 3 is the internal structure cut-away illustration of sensor in embodiment 1；
Fig. 4 is 1 corresponding pressure (P) of embodiment in the present invention to lg (Δ R1-ΔR2) Linear Fit Chart；
Fig. 5 is 2 corresponding bending angle (θ) of embodiment in the present invention to lg (Δ R1/ΔR2) Linear Fit Chart；
Fig. 6 is 3 corresponding pressure (P) of embodiment in the present invention to lg (Δ R1-ΔR2) Linear Fit Chart；
Fig. 7 is 4 corresponding pressure (P) of embodiment in the present invention to lg (Δ R1-ΔR2) Linear Fit Chart；
Fig. 8 is 5 corresponding bending angle (θ) of embodiment in the present invention to lg (Δ R1/ΔR2) Linear Fit Chart；
Description of symbols:
1- brittle polymer anisotropic conductive laminated film, the upper layer 11- brittle polymer anisotropic conductive THIN COMPOSITE
Film, 12- lower layer brittle polymer anisotropic conductive laminated film, 2- conducting resinl, the first conducting resinl of 21-, 22- second are conductive
Glue, 23- third conducting resinl, the 4th conducting resinl of 24-, 3- elastomeric polymer.
Specific embodiment
A kind of multifunction flexible strain gauge, comprising:
Brittle polymer anisotropic conductive laminated film 1, the brittle polymer anisotropic conductive laminated film 1 wrap
Upper layer brittle polymer anisotropic conductive laminated film 11 and lower layer's brittle polymer anisotropic conductive laminated film 12 are included,
The two parallel orthogonal stacks, and 1000 μm of spacing；
Conducting resinl 2, institute's conducting resinl 2 include the first conducting resinl 21, the second conducting resinl 22, third conducting resinl 23 and the 4th conduction
Glue 24；Wherein the first conducting resinl 21 and the second conducting resinl 22 are attached to upper layer brittle polymer anisotropic conductive laminated film 11
Upper surface, line is parallel with the smallest direction of conductivity of upper layer brittle polymer anisotropic conductive laminated film 11；
Third conducting resinl 23 and the 4th conducting resinl 24 are attached to the lower surface of lower layer's brittle polymer anisotropic conductive laminated film 12,
Its line is parallel with the smallest direction of conductivity of lower layer brittle polymer anisotropic conductive laminated film 12；
Elastomeric polymer 3, the elastomeric polymer 3 are multiple to the brittle polymer anisotropic conductive for being attached to conducting resinl 2
It closes film 1 to be embedded, and bullet is exposed in one end that conducting resinl 2 is not contacted with brittle polymer anisotropic conductive laminated film 1
Property polymer 3；
Close contact between the brittle polymer anisotropic conductive laminated film 1 and elastomeric polymer 3, gapless.
Further, the electrical anisotropy degree of the brittle polymer anisotropic conductive laminated film 1 is 1~7
Between, conductivity is between 100~4000S/cm in principal direction.
Further, the difference of the electrical anisotropy degree of the brittle polymer anisotropic conductive laminated film 1,
Fitting result between stress and the electric signal of measurement is different.
Further, the shape of the brittle polymer anisotropic conductive laminated film 1 is not limited to rectangle, and elasticity is poly-
The area for closing object 3 is greater than the area of the brittle polymer anisotropic conductive laminated film 1, and elastomeric polymer 3 can be completely
The brittle polymer anisotropic conductive laminated film 1 is covered, the shape of elastomeric polymer 3 is also not limited to rectangle.
Further, the integral thickness of the elastomeric polymer 3 is between 500~2000 μm.
Further, the upper table of the upper layer brittle polymer anisotropic conductive laminated film 11 and elastomeric polymer 3
The distance in face is between 50~1500 μm.
Further, the thickness of the brittle polymer anisotropic conductive laminated film 1 is between 5~30 μm.
Further, the action mode of the stress of the multifunction flexible strain gauge detection is not limited to perpendicular to it
The pressure on surface, can also be and deflect power outside face.
Further, the material of the elastomeric polymer 3 is dimethyl silicone polymer, the brittle polymer anisotropy
The material of conductive composite film 1 is polyaniline/argentum nano line.
Preparation method of the invention is further illustrated below by embodiment, but the present invention is not limited to these implementations
Example.It is unless otherwise specified conventional method in the experimental method of following examples；Material used in example, such as without special theory
It is bright, it is purchased from conventional chemical Reagent Company.
Embodiment 1
Elastomeric polymer 3 and brittle polymer anisotropic conductive laminated film 1 are respectively 30 × 30mm and 20 × 20mm
Square, and the latter is completely covered in the former, and thickness is respectively 2000 μm and 18 μm.Brittle polymer anisotropic conductive
The electrical anisotropy degree of laminated film 1 is 6.7, and conductivity is 187S/cm in principal direction.Upper layer brittle polymer conduction is multiple
Closing upper surface distance of the film 11 away from elastomeric polymer 3 is 1000 μm.Electricity between first conducting resinl 21 and the second conducting resinl 22
Resistance is denoted as R1, the resistance between third conducting resinl 23 and the 4th conducting resinl 24 is denoted as R2.The pressure (P) and R that sensor is subject to1With
R2Relative changing value (Δ Ri, i=1,2) difference logarithm it is linear, as shown in figure 4, regression equation be P=5.63lg
(ΔR1-ΔR2) -8.40, linear regression coeffficient 0.97.
Embodiment 2
Elastomeric polymer 3 and brittle polymer anisotropic conductive laminated film 1 are respectively that diameter is 15mm's and 10mm
Circle, and the latter is completely covered in the former, thickness is respectively 1000 μm and 5 μm.Brittle polymer anisotropic conductive is compound
The electrical anisotropy value of film 1 is 5, and conductivity is 1000S/cm in principal direction.Upper layer brittle polymer anisotropic conductive
Upper surface distance of the laminated film 11 away from elastomeric polymer 3 is 800 μm.Electricity between first conducting resinl 21 and the second conducting resinl 22
Resistance is denoted as R1, the resistance between third conducting resinl 23 and the 4th conducting resinl 24 is denoted as R2.Sensor is bent, it is curved
Angle (θ) and R1And R2The ratio between relative changing value logarithm it is linear, as shown in figure 5, regression equation is θ=- 16.4lg
(ΔR1/ΔR2)+161.12, linear regression coeffficient 0.96.
Embodiment 3
Elastomeric polymer 3 and brittle polymer anisotropic conductive laminated film 1 are respectively irregular shape and side length is
The equilateral triangle of 10mm, and the latter is completely covered in the former, thickness is respectively 1500 μm and 10 μm.Brittle polymer is respectively to different
Property conductive composite film 1 electrical anisotropy value be 3, conductivity is 2000S/cm in principal direction.Upper layer brittle polymer is each
Upper surface distance of the anisotropy conductive composite film 11 away from elastomeric polymer (3) is 500 μm.First conducting resinl 21 and second is conductive
Resistance between glue 22 is denoted as R1, the resistance between third conducting resinl 23 and the 4th conducting resinl 24 is denoted as R2.Sensor pressure
(P) and R1And R2Relative changing value difference logarithm it is linear, as shown in fig. 6, regression equation be P=-17.65lg (Δ
R1-ΔR2) -8.13, linear regression coeffficient 0.95, as shown in Figure 3.
Embodiment 4
Elastomeric polymer 3 and 1 area of brittle polymer anisotropic conductive laminated film are respectively 500mm2And 300mm2's
Irregular shape, and the latter is completely covered in the former, thickness is respectively 500 μm and 25 μm.Brittle polymer anisotropy is led
Electric 1 electrical anisotropy value of laminated film is 4, and conductivity is 3000S/cm in principal direction.Upper layer brittle polymer anisotropy
Upper surface distance of the conductive composite film 11 away from elastomeric polymer 3 is 100 μm.Between first conducting resinl 21 and the second conducting resinl 22
Resistance be denoted as R1, the resistance between third conducting resinl 23 and the 4th conducting resinl 24 is denoted as R2.Pressure (P) that sensor is subject to
R1And R2Relative changing value difference logarithm it is linear, as shown in fig. 7, regression equation be P=1.25lg (Δ R1-Δ
R2)+2.09, linear regression coeffficient 0.96.
Embodiment 5
Elastomeric polymer 3 be circle, brittle polymer anisotropic conductive laminated film 1 be respectively 40 × 20mm and 20 ×
The rectangle of 10mm, and the latter is completely covered in the former, thickness is respectively 1800 μm and 30 μm.Brittle polymer anisotropy is led
The electrical anisotropy value of electric laminated film 1 is 2, and the conductivity in principal direction is 4000S/cm.Upper layer brittle polymer respectively to
Upper surface distance of the anisotropic conductive composite film 11 away from elastomeric polymer 3 is 1500 μm.First conducting resinl 21 and the second conducting resinl
Resistance between 22 is denoted as R1, the resistance between third conducting resinl 23 and the 4th conducting resinl 24 is denoted as R2.Sensor is carried out curved
Song, curved angle (θ) and R1And R2The ratio between relative changing value it is linear, as shown in figure 8, regression equation be θ=
43.18lg(ΔR1/ΔR2)+8.9395, linear regression coeffficient 0.95.
Although the application will be described with reference to the specific embodiment shown in attached drawing, but it is to be understood that not
Under the background of the spirit and scope of the application introduction, the strain gauge of the application can be by many versions.This Shen
Component in each embodiment or structure please is able to carry out various combinations in the conceived case, this is all in the protection of the application
Within the scope of.Those of ordinary skill in the art will additionally appreciate different modes and be applied in the disclosed embodiments to change
Parameter, each fall in the spirit and scope of claims hereof.
Claims (9)
1. a kind of multifunction flexible strain gauge characterized by comprising
Brittle polymer anisotropic conductive laminated film (1), brittle polymer anisotropic conductive laminated film (1) packet
Include upper layer brittle polymer anisotropic conductive laminated film (11) and lower layer's brittle polymer anisotropic conductive laminated film
(12), the two parallel orthogonal stacks, and 1000 μm of spacing；
Conducting resinl (2), the conducting resinl (2) include the first conducting resinl (21), the second conducting resinl (22), third conducting resinl (23) and
4th conducting resinl (24)；Wherein the first conducting resinl (21) and the second conducting resinl (22) are attached to upper layer brittle polymer anisotropy
The upper surface of conductive composite film (11), the conductance of line and upper layer brittle polymer anisotropic conductive laminated film (11)
The smallest direction of rate is parallel；Third conducting resinl (23) and the 4th conducting resinl (24) are attached to lower layer's brittle polymer anisotropy and lead
The lower surface of electric laminated film (12), the conductivity of line and lower layer's brittle polymer anisotropic conductive laminated film (12)
The smallest direction is parallel；
Elastomeric polymer (3), the elastomeric polymer (3) is to the brittle polymer anisotropic conductive for being attached to conducting resinl (2)
Laminated film (1) is embedded, and conducting resinl (2) do not contacted with brittle polymer anisotropic conductive laminated film (1) one
Expose elastomeric polymer (3) in end；
Close contact between the brittle polymer anisotropic conductive laminated film (1) and elastomeric polymer (3), gapless.
2. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the brittle polymer is each
The electrical anisotropy degree of anisotropy conductive composite film (1) is between 1~7, and conductivity is in 100~4000S/ in principal direction
Between cm.
3. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the brittle polymer is each
The difference of the electrical anisotropy degree of anisotropy conductive composite film (1), the fitting knot between stress and the electric signal of measurement
Fruit is different.
4. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the brittle polymer is each
The shape of anisotropy conductive composite film (1) is not limited to rectangle, and the area of elastomeric polymer (3) is greater than the brittle polymer
The area of anisotropic conductive laminated film (1), and the brittle polymer anisotropy can be completely covered in elastomeric polymer (3)
The shape of conductive composite film (1), elastomeric polymer (3) is also not limited to rectangle.
5. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the elastomeric polymer
(3) integral thickness is between 500~2000 μm.
6. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the upper layer brittleness polymerization
Object anisotropic conductive laminated film (11) is at a distance from the upper surface of elastomeric polymer (3) between 50~1500 μm.
7. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the brittle polymer is each
The thickness of anisotropy conductive composite film (1) is between 5~30 μm.
8. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the multifunction flexible is answered
The action mode of the stress of force snesor detection is not limited to the pressure perpendicular to its surface, can also be and deflects power outside face.
9. a kind of multifunction flexible strain gauge according to claim 1, it is characterised in that: the elastomeric polymer
(3) material is dimethyl silicone polymer, and the material of the brittle polymer anisotropic conductive laminated film (1) is polyphenyl
Amine/silver nanowires.
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| CN113124744A (en) * | 2021-04-20 | 2021-07-16 | 电子科技大学 | Intelligent intervertebral trial mold, implant and control method |
| CN114459334A (en) * | 2022-01-28 | 2022-05-10 | 北京科技大学 | Composite sensor for tensile strain vector monitoring and preparation method thereof |
| CN114459334B (en) * | 2022-01-28 | 2023-10-10 | 北京科技大学 | Composite sensor for tensile strain vector monitoring and preparation method thereof |
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