CN109238128A - Big strain sensor of flexible inductive and preparation method thereof, big strain transducer - Google Patents
Big strain sensor of flexible inductive and preparation method thereof, big strain transducer Download PDFInfo
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- CN109238128A CN109238128A CN201811316891.6A CN201811316891A CN109238128A CN 109238128 A CN109238128 A CN 109238128A CN 201811316891 A CN201811316891 A CN 201811316891A CN 109238128 A CN109238128 A CN 109238128A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
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Abstract
The present invention provides big strain sensor of a kind of flexible inductive and preparation method thereof, big strain transducer, the big strain sensor of flexible inductive includes elastic matrix and inductance coil, and inductance coil is spirally fixed on elastic matrix；Insulation or mutually from and insulating between circle line and elastic matrix, the inductance value variation based on inductance coil obtains elongation strain value between the circle line of inductance coil and circle line.The big strain sensor of flexible inductive of the invention, conducting wire is spirally wound on elastic matrix, and elastic matrix makes sensing element have flexible and a wide range of strain, can be applied to the measurement under complex-curved big strain situation；Multi-drawing Repeatability is good；By the adjustment to coil canoe, elastic matrix magnetism, it can be achieved that the formedness line relationship of inductance value and strain, improves the measurement accuracy and sensitivity of measured parameter.
Description
Technical field
The invention belongs to flexible electronic device and preparation field, in particular to a kind of big strain sensor of flexible inductive
And preparation method thereof and the big strain transducer of flexible inductive.
Background technique
With the proposition of flexible electronic concept, the type of flexible electronic device emerges one after another, and also plays in different fields
More and more important and irreplaceable role, flexible sensor be a kind of wherein more active device.Sensor is by induction
Principle can be divided into pressure resistance type, piezoelectric type, inductance type etc..Wherein, inductance type transducer is to utilize inductance coil self-induction or mutual inductance
A kind of device of coefficient changed to realize non-electricity measure.The inductance value of inductance coil can be coil turn, straight with coil length
The change of the factors such as the ingredient of medium, relative position in diameter and coil and change, utilize this principle, inductance type pass
Sensor is by tested non electrical quantity such as strain, displacement, pressure, flow, vibration Parameter Switch at self-induction of loop amount L or mutual induction amount M
Variation, then exported by the variable quantity that measuring circuit is converted to voltage or electric current, cause the outer of coil inductance variation to measure
The variable quantity of boundary's parameter.
Inductance type transducer is usually used in measuring mechanical quantity.The China of Patent No. 00106632.3 and 200410060117.5
Patent each provides a kind of helical spring electricity of the conversion method and coiling of spring sensing element for spring coil sensor
Feel the method for coil, spring coil sensor therein, that is, inductance type strain transducer describes spring coil sensor in detail
To the measuring principle and process of mechanical quantity and its derivation physical quantity.The range of strain of spring coil itself is smaller, flexible poor
External parameter can only be measured within the scope of the elastic deformation of spring as a whole, to limit inductance type strain transducer
Using.
In addition, the key technology in sensor is sensing element.Although spring coil itself has certain flexibility,
Also the case where flexibility being only limitted in spring deformation range, overall structure is flexible poor, can not be suitable for arbitrary surface.
Due to the limitation of above-mentioned two o'clock, now inductance type transducer in the art, can't be applied to the big strain of curved surface
The measurement of respective physical amount under situation.
Summary of the invention
In view of the foregoing deficiencies of prior art, the embodiment of the present invention to be designed to provide a kind of flexible inductive big
Strain sensor and preparation method thereof and a kind of big strain transducer are big for solving flexible inductive in the prior art
The problems such as detectable range of strain of strain sensor is smaller and recovery is not good enough, flexible poor when amount of tension is larger.
In order to achieve the above objects and other related objects, the embodiment of the invention provides a kind of big strain of flexible inductive is quick
Sensing unit, the big strain sensor of flexible inductive includes elastic matrix and inductance coil；Wherein:
The inductance coil is spirally fixed on the elastic matrix；Between the circle line and circle line of the inductance coil
Insulation or mutually from；It insulate between the circle line and the elastic matrix of the inductance coil.
Further, the inductance coil is spirally fixed on the elastic matrix, further for inductance coil
Conducting wire is wound on the elastic matrix in a manner of one-way spiral.
Further, the mode that the inductance coil is fixed on the elastic matrix includes: the beam by elastic film
It ties up and realizes inductance coil in the fixation on elastic matrix surface；And/or by elastomer in the inductance coil and elastic matrix
Surface weave forms elastic weaving layer and realizes inductance coil in the fixation on elastic matrix surface；And/or made using binder described
Inductance coil is fixedly connected with the elastic matrix.
Further, it is closely wound without spacing on the elastic matrix or the inductance between the inductance coil circle line
It is equidistantly wound on the elastic matrix between coil turn line.
Further, the elastic matrix is electro-insulating rubber silk/rubber thread group；The conducting wire of the inductance coil be metal or
Organic conductive material.
According to another aspect of the present invention, a kind of preparation side of big strain sensor of flexible inductive is additionally provided
Method, the preparation method include the following steps:
Step S1 provides an elastic matrix；
Conducting wire spiral winding is fixed on the elastic matrix by step S2, forms inductor wire on the elastic matrix
Circle, insulation or mutually from and the circle line of the inductance coil and the elastic matrix between the circle line and circle line of the inductance coil
Between insulate.
According to another aspect of the present invention, a kind of big strain transducer of inductance type is additionally provided, the sensor includes
The above-described big strain sensor of flexible inductive.
Further, in the big strain transducer of the inductance type, the inductance coil and bullet that are fixed together in sensing element
Property matrix, has flexibility, fits in the surface of arbitrary shape measured object or depend on the ontology of arbitrary shape measured object.
Further, the sensor further include: measuring circuit；The measuring circuit is electrically connected with the inductance coil,
For measuring the real-time inductance value of inductance coil and according to the strain of inductance value calculation inductance coil.
According to another aspect of the present invention, a kind of electronic equipment is additionally provided, the electronic equipment includes the above
The big strain transducer of inductance type.
As described above, big strain sensor of flexible inductive of the invention and preparation method thereof, big strain transducer, tool
Have it is following the utility model has the advantages that
The big strain sensor of the flexible inductive of the embodiment of the present invention, conducting wire is spirally wound on elastic matrix, empty
Between utilization rate it is high, inductance coil deforms with the deformation of matrix, has again while with good structural flexibility sufficiently large
Strain measurement range, while recoverability is good, can also reply well when amount of tension is larger, is not susceptible to expendable
Plastic elongation deformation, and multi-drawing Repeatability is good；The big strain sensor of flexible inductive of the invention has good
Flexibility, can be applied to it is various have complex-curved object on.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the big strain sensor of flexible inductive of the embodiment of the present invention in its natural state；
Fig. 2 is the structural schematic diagram of the big strain sensor of flexible inductive of the embodiment of the present invention in a stretched state；
Fig. 3 is that the big strain sensor of flexible inductive of the embodiment of the present invention fits in the nature on measured object surface
Schematic diagram；
Fig. 4 is that the big strain sensor of flexible inductive of the embodiment of the present invention fits in the tensional state on measured object surface
Schematic diagram；
Fig. 5 is that the inductance value of the big strain sensor A of 1 flexible inductive of example and elongation strain are closed in the embodiment of the present invention
It is curve graph；
Fig. 6 is that the inductance value of the big strain sensor B of 2 flexible inductive of example and elongation strain are closed in the embodiment of the present invention
It is curve graph；
Fig. 7 is the structural schematic diagram of the big strain sensor C of 3 flexible inductive of example in the embodiment of the present invention；
Fig. 8 is the structural schematic diagram of big strain transducer in the embodiment of the present invention；
Fig. 9 is the sensor structure schematic diagram when embodiment of the present invention is applied to waistline measurement；
Figure 10 is that the embodiment of the present invention is applied to sensor mounting means signal in landslide monitoring and the electronic equipment of alarm
Figure；
Figure 11 is that the embodiment of the present invention is applied to sensor prison when occurring that comes down in landslide monitoring and the electronic equipment of alarm
Survey schematic illustration.
Description of symbols:
101- elastic matrix；102- inductance coil；103- measuring circuit.
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
The basic conception that only the invention is illustrated in a schematic way is illustrated provided in the embodiment of the present invention, then in diagram only
Display is with related component in the present invention rather than component count, shape when according to actual implementation and size are drawn, practical real
The kenel, quantity and ratio of each component can arbitrarily change when applying for one kind, and its assembly layout kenel may also be increasingly complex.
What can not normally be replied when the measurement range that the present invention is directed to strain transducer in the prior art is small, amount of tension is big asks
Topic improves the deflection of the big strain sensor of flexible inductive, to increase by the combination of flexible coil and elastic matrix
Measurement range, while obtaining good recoverability.Further details of theory is made to the present invention below by specific embodiment
It is bright.
First embodiment
Present embodiments provide a kind of big strain sensor of flexible inductive.Fig. 1 is the flexible inductive of the present embodiment
The big structural schematic diagram of strain sensor in its natural state.As shown in Figure 1, flexible inductive provided by the present embodiment is big
Strain sensor, comprising: elastic matrix 101 and inductance coil 102, the inductance coil 102 are spirally fixed on institute
It states on elastic matrix 101.Between the circle line of the inductance coil 102 and circle line insulation or mutually from；The circle of the inductance coil 102
It insulate between line and the elastic matrix 101.
The inductance coil 102 is formed by conducting wire helically coiling, and elastic matrix 101 is not limited in length and width
System, can need to select different elastic matrix sections according to different.And the measurement range of sensing element depends on elastic base
Therefore the tensile strength of body, rather than the tensile strength of inductance coil conducting wire can measure big strain.The elastic matrix 101 with
Synchronous stretching and reply not only may be implemented in inductance coil 102 after being fixed together, and may be implemented multi-angle bending or
Deformation has good flexible characteristic, can also fit in the measured object surface of arbitrary shape or depend on the tested of arbitrary shape
The ontology of object.
The inductance coil 102 is spirally fixed on the elastic matrix 101, can be one-way spiral, double helix
Or multispiral structure.Since the sensing element of one-way spiral winding is linearly preferable, it is preferred that the present embodiment is one-way spiral
The mode of winding.Meanwhile when winding, the number of turns as much as possible is wound, to improve the sensitivity of sensitive original part.
Further, the inductance coil 102 generates equal proportion or equivalent with the elongation strain of the elastic matrix 101
Elongation strain, replied with the reply of 101 deformation of elastic matrix, 102 inductance value of inductance coil is with pulls
The increase of strain and reduce.Fig. 2 is the structural schematic diagram under the big strain sensor tensional state of the present embodiment flexible inductive.
As shown in Fig. 2, the inductance coil 102 also generates equal proportion or the stretching of equivalent is answered when elastic matrix 101 generates elongation strain
Become, the inductance value of inductance coil 102 due to itself stretcher strain and reduce.It is answered when using the sensing element of the present embodiment
When becoming measurement, pass through the inductance value variation of measurement inductance coil 102, so that it may obtain the amount of tension of inductance coil 102, go forward side by side one
Step learns the amount of tension of elastic matrix, to obtain that elastic matrix or inductance coil is caused to generate elastically-deformable external parameter
Changing value.
Fig. 3 is when fitting on curved surface to carry out big strain measurement using the big strain sensor of the present embodiment flexible inductive
Nature figure.As shown in figure 3, the elastic matrix and inductance coil that are fixed together, fit closely the curved surface in measured object
Surface.Fig. 4, which show to fit in using the big strain sensor of the present embodiment flexible inductive, carries out big strain measurement on curved surface
When tensional state figure.
Further, the mode that the inductance coil 102 is fixed on the elastic matrix 101 includes: to pass through Thin Elastic
The constraint of film realizes inductance coil 102 in the fixation on 101 surface of elastic matrix；And/or by elastomer in the inductor wire
Circle 102 and 101 surface weave of elastic matrix form elastic weaving layer and realize the consolidating on 101 surface of elastic matrix of inductance coil 102
?；And/or it is fixedly connected with the inductance coil 102 with the elastic matrix 101 using binder.Preferably, the present embodiment
It realizes the inductance coil 102 with the elastic matrix 101 by elastic film to fix, the stretching of the elastic membraneous material
Intensity is sufficiently large, such as copolyesters (Ecoflex) film, meanwhile, between the inductance coil 102 and the elastic matrix 101
Auxiliary increases binder, to further enhance the fixation of the inductance coil 102 and the elastic matrix 101, when preventing from stretching
Opposite sliding between inductance coil 102 and elastic matrix 101.
102 turn-to-turn of inductance coil is closely wound without spacing on the elastic matrix 101, and the inductance coil
102 conductive line surfaces are coated with insulating layer；Or the inductance coil 102 is mutually wound in the elastic matrix by turn-to-turn from a manner of
On 101, it is preferred that the phase from mode be turn-to-turn it is equidistant mutually from；Regardless of which kind of mode used, it is necessary to prevent inductance coil
Mutually touching short circuit between 102 circle line and circle line.Preferably, in the present embodiment, 102 turn-to-turn of inductance coil is without spacing
It is closely wound on the elastic matrix 101, the conductive line surfaces of inductance coil 102 are coated with insulating layer, to make inductance with answering
More good linear character and higher sensitivity is presented in the variation of change.Preferably, inductance coil 102 described in the present embodiment
The selection of diameter of wire is excellent will not occur turn-to-turn because diameter is too small when winding on elastic matrix and be laminated in standard
Choosing, the present embodiment prepares inductance coil using the conducting wire of 0.1-0.5mm diameter；The cross-sectional shape of the conducting wire can be to appoint
Meaning plane geometric figure, such as round, rectangle；The lead material of the inductance coil 102 be metal or organic conductive material, such as
Copper, aluminium, silver, conductive rubber.
The elastic matrix 101 is elastic yarn or the magnetic elastomeric silk that may act as inductance coil magnetic core, it is preferred that this implementation
Elastic matrix in example is rubber thread or rubber thread group, and the rubber thread group includes several rubber threads.Preferably, the rubber
Silk or rubber thread group outer surface are enclosed with yarn, and the yarn can be Polyester Yarns, nylon yarn, polyester-cotton blend, pure cotton, high-elastic yarn, separately
On the one hand be conducive to being fixedly connected between inductance coil 102 and elastic matrix 101, avoid inductance coil 102 in the elasticity
The sliding of 101 surface of matrix.The diameter of the elastic matrix 101 is selected to be adapted with conducting wire winding and application environment as standard,
Such as sensor prepared by the sensing element be used for wearable product when, 101 diameter of elastic matrix is excessive to will affect wearing
Comfort.Preferably, 101 diameter of elastic matrix is 1-5mm in the present embodiment, and length is greater than 1m；The cross of the elastic matrix 101
Cross sectional shape can be arbitrary plane geometric figure, such as round, rectangle, it is preferred that the cross of elastic matrix described in the present embodiment
Section is circle.
When needing to carry out the big strain sensor of the embodiment of the present invention flexible inductive in application, using work appropriate
Skill is packaged the sensing element, and reserves lead appropriate.
From the above it can be seen that the big strain sensor of the flexible inductive of the present embodiment, by conducting wire spiral winding
On elastic matrix, space utilization rate is high, and inductance coil is deformed with the deformation of elastic matrix, by the elasticity of elastic matrix
Inductance coil can be made to generate bigger elastic stretching strain；Due to being elastic matrix, so that sensor has good flexibility,
While with sufficiently large strain measurement range there is good structural flexibility again, can apply and need bending deformation same
When the special occasions such as big strain, can also be applied to it is various have on complex-curved object, such as the monitoring and early warning on landslide, tool
There is the utility value in industrialization and engineering；Recoverability is good simultaneously, can also reply well when amount of tension is larger, be not easy to send out
Raw expendable plastic elongation deformation, and multi-drawing Repeatability is good；By to coil canoe, elastic matrix magnetic
Property adjustment, may make that inductance value and strain value keep good property line relationship, improve the measurement accuracy of measured parameter and sensitive
Degree.
Second embodiment
A kind of preparation method of big strain sensor of flexible inductive is present embodiments provided, the preparation method includes
Following steps:
Step S1 provides an elastic matrix 101；
Step S2 by conducting wire spiral winding and is fixed on the elastic matrix 101, the shape on the elastic matrix 101
At inductance coil 102；Wherein, between the circle line of the inductance coil and circle line insulation or mutually from；The circle line of the inductance coil
It insulate between the elastic matrix.
In this step, the conducting wire spiral winding and mode being fixed on the elastic matrix 101 includes: to pass through elasticity
The constraint of film realizes inductance coil 102 in the fixation on 101 surface of elastic matrix；And/or by elastomer in the inductance
Coil 102 and 101 surface weave of elastic matrix form elastic weaving layer and realize inductance coil 102 on 101 surface of elastic matrix
It is fixed；And/or it is fixedly connected with the inductance coil 102 with the elastic matrix 101 using binder.Preferably, this implementation
Example makes the inductance coil 102 realize fixation, the drawing of the elastic membraneous material with the elastic matrix 101 by elastic film
It is sufficiently large to stretch intensity, such as copolyesters (Ecoflex) film, meanwhile, the inductance coil 102 and the elastic matrix 101 it
Between auxiliary increase binder, to further enhance the fixation of the inductance coil 102 with the elastic matrix 101, prevent from stretching
When inductance coil 102 and elastic matrix 101 between opposite sliding.
Preferably, the preparation method further include:
Step S3, the inductance coil and elastic matrix being fixed together, fit in arbitrary shape measured object surface or
Depend on the ontology of arbitrary shape measured object.
Laminating type in this step can be the mode of fixed or revocable fitting, as long as inductance coil and elasticity
Matrix can realize synchronous deformation with measured object.When needing to measure the variation inside measured object, by the inductance
Coil and elastic matrix are fixed or need measuring point through measured object, so that measured object inside and the inductance coil and bullet
Property matrix realize synchronous deformation.
Preparation method through this embodiment is prepared for the big strain sensitive member of flexible inductive as in the first embodiment
Part, and preliminary analysis has been carried out to the performance of sensing element.
It is big to the preparation method of the present embodiment and the flexible inductive of first embodiment below by three specific implementations
Strain sensor is described in further detail.
Example 1
Preparation process:
Step S101 provides the rubber band of a diameter 3mm, long 22cm.
The enameled wire of diameter 0.2mm spiral winding and is fixed on rubber band in a manner of no spacing, is twined by step S102
Around length 20cm, it is located among rubber band, each residue 1cm rubber band in both ends, while enameled wire is each at the rubber band both ends of winding
Stay certain length for access test circuit.
The big strain sensor A of flexible inductive is obtained, it is essentially identical with structure shown in Fig. 1.
Test process:
For initial inductance value, true value can be obtained by theoretical calculation.For inductance coil, if it is air core coil,
Formula can then be passed through(wherein, L indicates that coil inductance/henry, D indicate that coil diameter/m, N indicate line
The number of turns is enclosed, l indicates coil length/m) calculate theoretical inductance value；If elastic matrix has magnetism, inductance coil is non-empty
The calculating empirical equation of the heart, theoretical inductance value is(wherein,L expression coil inductance/
Henry, μ0For space permeability/4 π × 10-7, μsFor line, circle inner core relative permeability, S is coil cross-sectional area/m2, D expression
Coil diameter/m, N indicate that coil turn/circle, l indicate coil length/m).
For the sensing element A of example 1, the diameter D of inductance coil is 3.2mm, and length l is 20cm, and N is 950 circles, is calculated
Obtaining theoretical inductance value is 45.88 microhenrys.A is accessed into measuring circuit, the initial inductance value for measuring inductance coil is 42.214 microhenrys.
Measuring circuit is corrected by the relative error of theoretical inductance value and actual inductance value in actual measurement, to improve survey
The accuracy of amount.It can be seen that the big strain of flexible inductive prepared by preparation method through this embodiment from above-mentioned numerical value
Sensing element, relative error is small, within the acceptable range.
After A is accessed measuring circuit, stretching experiment is carried out, obtains the inductance value and elongation strain relationship of one cycle stretching
Curve graph, Fig. 5 show the inductance value and elongation strain relationship of the big strain sensor A of 1 flexible inductive of the present embodiment example
Curve graph.As shown in figure 5, the inductance coil inductance value reduces with the increase of elongation strain, increase with reply, flexible electrical
The inductance value of the big strain sensor of sense formula and elongation strain have good linear relationship, by linear analogue it can be concluded that one
A simple linear relation, y=-kx+b, k and b therein are constant.By fitting it is found that the formula y=-kx+b of example 1
In, k=0.305, b=42.7；Then when inductance value y is 42.7 (microhenry), extensibility x is 0, and deformation occurs for inductance coil；
When inductance value is 36.5, extensibility x is 20%, and inductance coil generates 20% elongation strain, then elastic matrix also generates
20% elongation strain, so as to learn the variation of corresponding external parameter.Moreover, the curve for stretching and replying weighs substantially
It closes, it is known that the recoverability of sensing element is good.It has carried out that experiment is repeated several times, has obtained identical result.Pass through monitoring electricity
The inductance value variation for feeling coil, so as to learn the amount of tension of inductance coil, and further learns the amount of tension of elastic matrix,
To learn the changing value for causing elastic matrix and/or inductance coil to generate elastically-deformable external parameter, in the present embodiment
The external parameter is the external force for causing rubber band to stretch.Thus, the big strain sensor of the flexible inductive of the present embodiment can
Measured variation is obtained to change based on the inductance value of the inductance coil.
Example 2
Preparation process:
Step S101, provides a rubber band group being made of several rubber bands, the rubber band section be side length 1mm just
It is rectangular, a length of 102cm.
The enameled wire of diameter 0.2mm spiral winding and is fixed in rubber band group by step S102 in a manner of no spacing,
Coiling length 100cm is located among rubber band group, each residue 1cm rubber band in both ends, while enameled wire is in the rubber band group of winding
Both ends respectively stay certain length for access test circuit.
The big strain sensor B of flexible inductive is obtained, it is essentially identical with structure shown in Fig. 1, the difference is that the bullet
The section of property matrix rubber band is square.
Test process:
After B is accessed measuring circuit, stretching experiment is carried out, obtains the inductance value of cyclic tension three times and elongation strain relationship
Curve graph, Fig. 6 show the inductance value of the big strain sensor B of 2 flexible inductive of example and elongation strain in the present embodiment and close
It is curve graph.As shown in fig. 6, passing through linear analogue, it can be deduced that in example 2 in formula y=-kx+b, k=96, b=200；Then
When inductance value y is 200 (microhenry), extensibility x is 0, and deformation occurs for inductance coil；When inductance value is 152, extensibility x
It is 0.5, i.e., 50%, inductance coil generates 50% elongation strain, then elastic matrix also generates 50% elongation strain, so as to
To learn the variation of corresponding external parameter.Moreover, the curve for stretching and replying essentially coincides, it is known that the recovery of sensing element
It can be good.It has carried out that experiment is repeated several times, has obtained identical result.
Example 3
Preparation process:
Step S101, provide one be width 6mm, the section of thickness 1mm, long 2m are the rubber band of rectangle.
The copper conductor of diameter 0.1mm with the equidistant spiral winding of pitch P=1mm and is fixed on rubber band by step S102
On, braid angle θ=0.81846 °~4.0856 ° are calculated corresponding to pitch, coiling length 198cm is located among rubber band,
Each residue 1cm rubber band in both ends, at the same copper conductor the rubber band both ends of winding respectively stay certain length for access test it is electric
Road.
The big strain sensor C of flexible inductive is obtained, Fig. 7 show the prepared big strain sensitive of flexible inductive
Component structure schematic diagram.
It, can be in one layer insulating of rubber band outer cladding for being wound with copper conductor in order not to keep copper conductor exposed.
Test process:
After C is accessed measuring circuit, stretching experiment is carried out, maximum value is stretched up to 40%, recycles 100 times, stretch and return
Multiple curve essentially coincides, it is known that the recoverability of sensing element is good.
3rd embodiment
The big strain transducer of a kind of inductance type is present embodiments provided, the sensor includes as in the first embodiment
The big strain sensor of flexible inductive.
Further, the big strain transducer of the inductance type can also include a measuring circuit 103, and Fig. 8 show this
The composed structure schematic diagram of the big strain sensor of flexible inductive described in embodiment.As shown in figure 8, the measuring circuit 103
It is electrically connected with the inductance coil 102.Measuring circuit 103 can directly measure the real-time inductance value of inductance coil 102 or centainly answer
Inductance value variation under becoming, and measured inductance value is changed into the parameter of coil and from which further follows that the strain of coil, or
Measured inductance value variation is directly translated into coil strain, thus calculate displacement corresponding with coil strain, strain,
The Parameters variations such as pressure, flow, vibration.Above-mentioned calculating process can pass through PLC circuit or chip microcontroller.
Further, the measuring circuit 103 includes: measurement module, computing module, display module, the measurement module
According to electromagnetic induction and circuit theory, the inductance value for the inductance coil being attached thereto directly is measured, and by measured inductance value
It is sent to computing module, alternatively, being sent to computing module and display module simultaneously.The computing module is used for received according to institute
Inductance value calculation goes out the strain of inductance coil 102, and calculates corresponding measured ginseng according to the strain gauge of inductance coil 102
Number variation, then parameter variation value calculated is sent to display module.The display module is for showing measurement result.
Particularly, the measurement module includes: direct current resistance m easurem ent submodule, ac current measurement submodule；The meter
Calculating module includes: impedance computation submodule, inductance computational submodule, strain and Parameter Switch computational submodule.
Specifically, carrying out the measurement of inductance value using following methods:
Disconnect the power supply of measurement module 32, the D.C. resistance R of measurement inductance coil first is simultaneously recorded；Measure inductance coil
D.C. resistance after be instant on measurement module power supply, the power supply of the input is alternating current, voltage U, working frequency f；
The electric current I in circuit is measured, according to I=U/ZAlways, total impedance in counting circuit circuit；Further according to
Calculate the inductance value L of inductance coil.The computing module passes through programmable logic controller (PLC) PLC or chip microcontroller.
The display module is display.
Fourth embodiment
The present embodiment provides a kind of electronic equipment, the electronic equipment includes the big inductive sensing of inductance type described in 3rd embodiment
Device.
Further, the electronic equipment can be wearable device, strain detecting equipment, mobile phone, tablet computer or each
The ancillary equipment etc. of kind electronic equipment.
According to the present embodiment special applications scene one, the electronic equipment is the intelligence for measuring waistline and breathing
It can wearable device.Fig. 9 show the present embodiment application scenarios sensor structure schematic diagram once.This reality is only illustrated in Fig. 9
The structure of transducing part in example is applied, measurement part is not drawn.Measurement electricity identical with first embodiment can be used in the measurement
Road is simultaneously optimized accordingly.As shown in figure 9, the big strain transducer of the inductance type to be used to measure the intelligence of waistline and breathing
When in wearable device, after the inductance coil and elastic matrix are fixed together, being arranged in the intelligence around waist can
In wearable device, the real-time change of user's waistline, Yi Jihu are obtained by monitoring the real-time change of sensor elongation strain
It inhales data, the flexibilities of sensor such as frequency and ensures the comfort of wearable device, the big elongation strain range of sensor and drawing
Stretching intensity ensure that sensor can be adjacent to waist setting or wearing, meets real-time waistline measurement or monitors wanting for abdomen fluctuating
It asks.Suitable for any figure, and have high sensitivity and scalability, can on the basis of the sensor, exploitation with
The monitoring of other relevant physiological parameters.
According to another special applications scene two of the present embodiment, the electronic equipment is for landslide monitoring and early warning
Strain detecting and warning device.The big strain sensor of the flexible inductive is used for the strain detecting of landslide monitoring and early warning
When with warning device, after the inductance coil and elastic matrix are fixed together, depended in a manner of passing through slip-crack surface
In the slopes monitored, when slopes occur along the sliding of slip-crack surface, the slopes of sliding drive the sensor portion mutually depended on therewith
It point slides together, and the Sensor section mutually depended on through slip-crack surface and non-slip slopes is then motionless, and sensor is consequently formed
Whole deformation, due to the aximal deformation value characteristic of big strain transducer, even if moment a wide range of slip occurs for slopes, sensor according to
It can so measure.
Figure 10 is that the big strain sensor of flexible inductive is applied to one of which mounting means when landslide monitoring and early warning
Schematic diagram.The structure of transducing part in the present embodiment is only illustrated in Figure 10, does not draw measurement part.The measurement can adopt
Optimized with measuring circuit identical with first embodiment and accordingly.As shown in Figure 10, the inductor wire of big strain transducer
Circle and elastic matrix pass through slip-crack surface through slopes, the inductance variation of real-time monitoring inductance coil.It needs exist for emphasizing
, inductance coil and elastic matrix be tightly secured together, once deforming, the two is synchronous.Meanwhile inductance
Coil and elastic matrix as a whole, are firmly secured in slopes, can be fixed by the way of grouting；Due to electricity
Feeling coil and elastic matrix has indispensable tensile strength, and during deforming with slopes, part slopes may loosely break
It splits, but inductance coil and elastic matrix then always remain as an entirety.
Figure 11 show the deformation signal of the big strain sensor of flexible inductive when slopes are slided along slip-crack surface
Figure.As shown in figure 11, when slopes are slided along slip-crack surface, inductance coil can be divided into three parts due to the sliding of slopes.
First part is fixed in the slopes of sliding, is subjected to displacement with slopes；Second part is fixed in non-slip slopes；Third portion
Be allocated as the connection for first part and second part, due to slopes sliding and two-part relative displacement and deform, together
When also will drive first part and the connected part of second part deforms.By changing to entire coil inductance
Monitoring, to calculate the deflection of coil, the sliding of real-time monitoring slopes, and reaching threshold value alarm.
It can be seen from the above the electronic equipment based on the big strain sensor of flexible inductive of the embodiment of the present invention,
Sensing element is made and conducting wire is spirally wound on elastic matrix, space utilization rate is high, and inductance coil is with elastic base
The deformation of body and deform, inductance coil can be made to generate bigger elastic stretching by the elasticity of elastic matrix and strained；Due to being
Elastic matrix has good again so that sensor has good flexibility while with sufficiently large strain measurement range
Structural flexibility, can apply and need the bending deformation special occasions such as big strain simultaneously, can also be applied to various there is complexity
On the object of curved surface；Recoverability is good simultaneously, can also reply well when amount of tension is larger, be not susceptible to expendable modeling
Property stretcher strain, and multi-drawing Repeatability is good；By the adjustment to coil canoe, elastic matrix magnetism, can make
It obtains inductance value and strain value keeps good property line relationship, improve the measurement accuracy and sensitivity of measured parameter；To adapt to electricity
The special requirements such as the wearable of sub- equipment, flexible curved surface, aximal deformation value realize electronic equipment on the basis of wearable, flexible
The function of completing a wide range of strain detecting can be applied to medicine physiological compensation effects, kinematic parameter monitoring and engineering construction
In terms of specific demand, have a extensive future.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be covered by the claims of the present invention.
Claims (10)
1. a kind of big strain sensor of flexible inductive, which is characterized in that the big strain sensor packet of flexible inductive
Include elastic matrix and inductance coil；Wherein:
The inductance coil is spirally fixed on the elastic matrix；It insulate between the circle line and circle line of the inductance coil
Or mutually from；It insulate between the circle line and the elastic matrix of the inductance coil.
2. the big strain sensor of flexible inductive according to claim 1, which is characterized in that the inductance coil is with spiral shell
Rotation shape is fixed on the elastic matrix, further for the conducting wire of inductance coil is wound in the bullet in a manner of one-way spiral
On property matrix.
3. the big strain sensor of flexible inductive according to claim 1, which is characterized in that the inductance coil is fixed
It include: that inductance coil consolidating on elastic matrix surface is realized by the constraint of elastic film in the mode on the elastic matrix
?；And/or elastic weaving layer is formed in the inductance coil and elastic matrix surface weave by elastomer and realizes inductor wire
Enclose the fixation on elastic matrix surface；And/or it is fixedly connected with the inductance coil with the elastic matrix using binder.
4. the big strain sensor of flexible inductive according to claim 1, which is characterized in that the inductance coil circle line
Between be closely wound without spacing in being equidistantly wound in the elastic matrix on the elastic matrix or between the inductance coil circle line
On.
5. the big strain sensor of flexible inductive according to claim 4, which is characterized in that the elastic matrix is exhausted
Edge rubber thread/rubber thread group；The conducting wire of the inductance coil is metal or organic conductive material.
6. a kind of preparation method of the big strain sensor of flexible inductive, which is characterized in that the preparation method includes as follows
Step:
Step S1 provides an elastic matrix；
Conducting wire spiral winding is fixed on the elastic matrix by step S2, and inductance coil, institute are formed on the elastic matrix
State between the circle line of inductance coil and circle line insulation or mutually from and between the circle line and the elastic matrix of the inductance coil absolutely
Edge.
7. a kind of big strain transducer of inductance type, which is characterized in that the sensor includes such as any one of claim 1 to 5 institute
The big strain sensor of the flexible inductive stated.
8. the big strain transducer of inductance type according to claim 7, which is characterized in that the big strain transducer of inductance type
In, the inductance coil and elastic matrix being fixed together in sensing element have flexibility, fit in the table of arbitrary shape measured object
Face or the ontology for depending on arbitrary shape measured object.
9. the big strain transducer of inductance type according to claim 7, which is characterized in that the sensor further include: measurement
Circuit；The measuring circuit is electrically connected with the inductance coil, for measuring the real-time inductance value of inductance coil and according to inductance
Value calculates the strain of inductance coil.
10. a kind of electronic equipment, which is characterized in that the electronic equipment includes such as the described in any item inductance of claim 7~9
The big strain transducer of formula.
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