CN104997569B - Comprehensive tooth measuring instrument based on detachable tooth socket - Google Patents

Abstract

The invention discloses a comprehensive tooth measuring instrument based on a detachable tooth socket. The measuring instrument comprises a tooth biting collecting unit, a tooth looseness collecting unit, the tooth clamping socket, a data collecting card, a data processing unit, a wireless communication unit and a controller. The tooth biting collecting unit and the tooth looseness collecting unit are installed on the tooth clamping socket and are thin film three-dimensional force pressure sensors. Each sensor comprises a control unit, an X-direction capacitor unit set and a Y-direction capacitor unit set, wherein the X-direction capacitor unit set and the Y-direction capacitor unit set are connected with the control unit. According to the comprehensive tooth measuring instrument, as the tooth biting collecting unit and the tooth looseness collecting unit are matched and carry out accurate measuring and the sensors are improved and are small in thickness, influences on the detection accuracy are quite small, measurement of biting force has important reference value in diagnosing and treating tooth diseases, and the problems that in the prior art, the detection result is inaccurate, the difference is large and data are unreliable are solved.

Description

A kind of tooth general measuring instrument based on detachable facing

Technical field

The invention belongs to tooth detection field, it is related to the general measuring instrument of accurate measurement and in particular to one kind is based on removable Unload the tooth general measuring instrument of facing.

Background technology

Can help us that the damaged condition of oral cavity cacodontia is had by the measurement of dental articulation power and odontoseisiies displacement One accurately objective understanding, and have important reference value to the diagnosis of multiple periodontal disease.

Gmatjpdumamicss are the masticatory pressures being produced by the effect of muscle during upper lower tooth contact, and this strength is delivered to tooth by tooth Week organizes and is delivered to jawbone again and disperses.Either natural teeth or artificial tooth, they must be by gmatjpdumamicss come function. Tooth body, the pathological changes of periodontal necessarily make gmatjpdumamicss reduce.After wearing artificial tooth, gmatjpdumamicss are lower than natural teeth.Clinical research shows, stings Make a concerted effort to be one of reflection masticatory muscless, the important symbol of stomatognathic system.By measure gmatjpdumamicss size can help it is understood that The function status of stomatognathic system, and the diagnosis to multiple diseases provides reference.The illness at each position in top collar portion all may be made Become the decline of gmatjpdumamicss.Patient's gmatjpdumamicss of disorders of temporomandibular joint are decreased obviously than normal person.Serious error articulation deformity, The acute injury of hinge area also results in significantly reducing of gmatjpdumamicss.Because gmatjpdumamicss are relevant with multiple diseases, therefore a lot The reference index that can recover as masticatory function in the therapeutic process of disease.

To be that doctor rocks by using dental forceps tested for conventional tooth mobility diagnostic method in domestic clinical oral at present Tooth, diagnoses its aeration level.The method lacks objective quantitative criteria, there is the similar and different tester of tester simultaneously and applies Power is different, the different problem of diagnostic result.

Content of the invention

In order to overcome above the deficiencies in the prior art, the present invention proposes a kind of tooth composite measurement based on detachable facing Instrument, by dental articulation collecting unit, the cooperation of odontoseisiies collecting unit and accurate measurement, and will not be carried out to sensor Improve, thickness is little, and the impact to detection accuracy is very little, measure the diagnosis to odontopathy for gmatjpdumamicss and treatment has Important reference value, it is inaccurate to solve testing result in prior art, and difference is big, the insecure problem of data.

To achieve these goals, the technical scheme that the present invention takes is: a kind of tooth based on detachable facing is comprehensive Measuring instrument, this measuring instrument includes dental articulation collecting unit, odontoseisiies collecting unit, tooth cutting ferrule, data collecting card, data Processing unit, wireless communication unit and controller, described dental articulation collecting unit, odontoseisiies collecting unit are installed on tooth On cutting ferrule, described data collecting card collection dental articulation collecting unit, the data of odontoseisiies collecting unit, described data processing Controller is delivered to, described data processing unit, wireless communication unit are respectively after the information processing that data collecting card is gathered by unit Connect with controller, described wireless communication unit is communicated with long-range receiving unit, described dental articulation collecting unit, tooth Loosening collecting unit is all using thin film three-dimensional force pressure transducer.Described thin film three-dimensional force pressure transducer include control unit, The x direction capacitor cell group being connected respectively with control unit and y direction capacitor cell group, described x direction capacitor cell group and y side All include capacitor cell module to capacitor cell group, described capacitor cell module is using by plural strip capacitor cell group The comb teeth-shaped structure becoming, each strip capacitor cell includes the drive electrode of top crown and the induction electrode of bottom crown.Described tooth Tooth cutting ferrule includes side set and bottom set, and described side set and bottom set are detachably connected, and described odontoseisiies collecting unit is installed on side set On, described dental articulation collecting unit is installed on bottom and puts.Described bottom set includes the bottom set card for being mutually detachably connected, bottom Set card top and bottom are equipped with the bottom set clamping structure of card and dental articulation collecting unit, and side set is included for being mutually detachably connected Side set card, side covers card one side and is provided with the side of card and odontoseisiies collecting unit and cover clamping device, is simultaneously provided with and tooth The card being seamlessly connected and device.Described data processing unit includes data filtering units, data sorting unit, Data Fusion Unit database unit, described data filtering units are used for the wrong data of filtered sensor collection, described data grouping sheet Unit classifies to the data after filtering, and it is defeated that Data Fusion unit carries out fusion treatment according to the data of data sorting unit Go out two-dimensional data table, data base is used for storing detection data and normal data, described normal data is normal tooth data.

In said apparatus, described capacitor cell module is included by two or more width a₀Length b₀Strip capacitor cell group The the first strip capacitor cell group becoming and two or more width ka₀Length b₀Strip capacitor cell composition the second strip electric capacity Unit group.The drive electrode of each strip capacitor cell described is identical with induction electrode width, and the length of drive electrode is more than sense Answer electrode length, left difference position δ is reserved at drive electrode length two ends respectively_LeftWith right difference position δ_Right, b_{0 drive}=b_{0 sense}+δ_Right+δ_Left, wherein, b_{0 drive} For the drive electrode length of strip capacitor cell, b_{0 sense}For the induction electrode length of strip capacitor cell, described difference position δ_Left=δ_Right, AndWherein d₀For strip capacitor cell dielectric thickness, g is the modulus of rigidity of elastic fluid, τ_maxAnswer for maximum Force value.Described comb teeth-shaped structure includes the lead that more than 20 strip capacitor cells are connected one to one with strip capacitor cell, It is provided with electrode spacing a between adjacent two strip capacitor cells_δ, described parallel plate suqare s=m (a₀+2_aδ+ka₀)b₀/ 2, wherein, m For strip capacitor cell quantity, b₀For the length of strip capacitor cell, a₀The width of strip capacitor cell.Described first strip electricity In parallel or independent mode is connected to control to the strip capacitor cell lead of appearance unit group and the second strip capacitor cell group Unit.The width of described strip capacitor cellWherein, d₀For dielectric thickness, e is the Young's moduluss of elastic fluid, g Modulus of rigidity for elastic fluid.Between described first strip capacitor cell group and the second strip capacitor cell group and control unit It is respectively equipped with intermediate translator, intermediate translator is used for arranging the transmission coefficient to electric capacity or frequency to electric capacity for the voltage.

The medicine have the advantages that for the degree of accuracy improving tooth general measuring instrument, being equipped with tooth in the present invention and sting Close collecting unit, odontoseisiies collecting unit, and for installing the tooth cutting ferrule of collecting unit, each side set card and bottom set Card and every tooth correspond, and side covers card and is configured into one group with the size of bottom set card according to the stock size of tooth, The size of thin film three-dimensional force pressure transducer and side set card and bottom set card correspond, and so can set for different teeth Put different sides set cards and bottom set card, for need measurement tooth can separately installed measurement tooth side set card and Bottom covers card, it is to avoid impact each other, is also prevented from the impact of transmission data simultaneously.Pass to improve thin film three-dimensional force pressure The reliability and stability of the sensitivity of sensor, conversion accuracy and touch sensing system, have devised with pcb plate as parallel-plate Electrode and pdms are the dielectric layer of base material, and planar dimension is 10 × 10mm²Combined electric capacity Sensitive Apparatuses.The present invention is passing through On the basis of capacitance measurement three-dimensional force, effectively using platen area, and by the method effectively solving three-dimensional force such as differential between coupling Close, so that normal direction and tangential conversion all reach higher linear, precision and sensitivity.

Brief description

Below the labelling of the content expressed by this specification accompanying drawing and in figure is briefly described:

Fig. 1 is the work structuring block diagram of the specific embodiment of the present invention.

Fig. 2 is strip capacitor cell and its coordinate system of the specific embodiment of the present invention.

Fig. 3 is the strip capacitor cell schematic diagram of the specific embodiment of the present invention.

Fig. 4 is the strip capacitor cell dextrad skew schematic diagram of the specific embodiment of the present invention.

Fig. 5 is the strip capacitor cell left-hand skew schematic diagram of the specific embodiment of the present invention.

Fig. 6 is the width of the specific embodiment of the present invention is a₀And ka₀Electric capacity to stress deflection graph.

Fig. 7 is the parallel-plate three-dimensional force pressure sensor structure figure of the specific embodiment of the present invention.

Fig. 8 is the signal schematic representation of the cell capacitance pair of the specific embodiment of the present invention.

Fig. 9 is the plane-parallel capacitor cross-section structure of the specific embodiment of the present invention.

Wherein, 1, upper pcb substrate, 2, lower pcb substrate, 3, drive electrode, 4, induction electrode, 5, elastic fluid.

Specific embodiment

Below against accompanying drawing, by the description to embodiment, for example involved each component of the specific embodiment of the present invention Shape, construction, the mutual alignment between each several part and annexation, the effect of each several part and operation principle, manufacturing process and Operate with method etc., is described in further detail, to help those skilled in the art to the inventive concept of the present invention, technology Scheme has more complete, accurate and deep understanding.

A kind of tooth general measuring instrument based on detachable facing, its structured flowchart is as shown in figure 1, this measuring instrument includes tooth Tooth occlusion collecting unit, odontoseisiies collecting unit, tooth cutting ferrule, data collecting card, data processing unit, wireless communication unit And controller, described dental articulation collecting unit, odontoseisiies collecting unit be installed on tooth cutting ferrule, described data collecting card Collection dental articulation collecting unit, the data of odontoseisiies collecting unit, data collecting card is gathered by described data processing unit Information processing after deliver to controller, described data processing unit, wireless communication unit connect with controller respectively, described wireless Communication unit is communicated with long-range receiving unit, and described dental articulation collecting unit, odontoseisiies collecting unit are all using thin Film three-dimensional force pressure transducer, long-range receiving unit can be the signal receivers such as mobile phone, server.

Described tooth cutting ferrule includes side set and bottom set, and described side set and bottom set are detachably connected, described odontoseisiies collection Unit is installed on side and puts, and described dental articulation collecting unit is installed on bottom and puts.Described bottom set is included for mutually detachably connecting The bottom set card connecing, bottom covers the bottom set clamping structure that card top and bottom are equipped with card and dental articulation collecting unit, and side set includes For the side set card being mutually detachably connected, side covers the side set clamping dress that card one side is provided with card and odontoseisiies collecting unit Put, be simultaneously provided with the card being seamlessly connected with tooth and device.

Side set and bottom set cover card by side respectively and bottom covers card and formed, and each side set card and bottom cover card and every Tooth corresponds, and side covers card and is configured into one group with the size of bottom set card according to the stock size of tooth, thin film three-dimensional force The size of pressure transducer and side set card and bottom set card correspond, so can be for the different side of different tooth settings Set card and bottom set card, separately installed can measure side set card and the bottom set card of tooth for the tooth needing measurement, Avoid impact each other, be also prevented from the impact of transmission data simultaneously.

During installation, for the tooth needing measurement, select side set card and the bottom set card of suitable dimension, then according to conjunction The side set card of suitable size and bottom set card select suitable thin film three-dimensional force pressure transducer to cover card and bottom set card in side Block and side is covered card and bottom set card connects composition cutting ferrule respectively and bottom covers, cutting ferrule is displaced into the tooth position of needs measurement After putting overlap, the card of card is covered by side and side set is fixed on tooth device, afterwards bottom set is installed on side and puts.Bottom covers One side can be set according to actual needs and place dental articulation collecting unit, or dental articulation collection list is all placed on two sides Unit, so can effectively reduce the thickness of tooth, improve certainty of measurement.

Described data processing unit includes data filtering units, data sorting unit, Data Fusion unit data Library unit, described data filtering units are used for the wrong data of filtered sensor collection, after described data sorting unit is to filtering Data classified, Data Fusion unit according to the data of data sorting unit carry out fusion treatment output 2-D data Table, data base is used for storing detection data and normal data, and described normal data is each item data of normal tooth.

Thin film three-dimensional force pressure transducer includes the x direction capacitor cell group that control unit is connected respectively with control unit With y direction capacitor cell group, described x direction capacitor cell group and y direction capacitor cell group all include capacitor cell module, described Using the comb teeth-shaped structure being made up of plural strip capacitor cell, each strip capacitor cell includes capacitor cell module The drive electrode of top crown and the induction electrode of bottom crown.Described capacitor cell module is included by two or more width a₀Length b₀ First strip capacitor cell group of strip capacitor cell composition and two or more width ka₀Length b₀Strip capacitor cell composition Second strip capacitor cell group.The drive electrode of each strip capacitor cell described is identical with induction electrode width, drive electrode Length be more than induction electrode length, drive electrode length two ends reserve respectively left difference position δ_LeftWith right difference position δ_Right, b_{0 drive}=b_{0 sense}+δ_Right+ δ_Left, wherein, b_{0 drive}For the drive electrode length of strip capacitor cell, b_{0 sense}Induction electrode length for strip capacitor cell.Described difference Position δ_Left=δ_Right, andWherein d₀For dielectric thickness, g is the modulus of rigidity of elastic fluid, τ_maxFor maximum stress Value.Described comb teeth-shaped structure includes the lead that more than 20 strip capacitor cells are connected one to one, phase with strip capacitor cell It is provided with electrode spacing a between adjacent two strip capacitor cells_δ.Described parallel plate suqare s=m (a₀+2_aδ+ka₀)b₀/ 2, wherein, m is Strip capacitor cell quantity, b₀For the length of strip capacitor cell, a₀The width of strip capacitor cell.Described first strip electric capacity The strip capacitor cell lead of unit group and the second strip capacitor cell group in parallel or is independently connected to control unit.Institute State the width of strip capacitor cellWherein, d₀For dielectric thickness, e is the Young's moduluss of elastic fluid, and g is that elasticity is situated between The modulus of rigidity of matter.It is provided with centre between described first strip capacitor cell group and the second strip capacitor cell group and control unit Changer, intermediate translator is used for arranging the transmission coefficient to electric capacity or frequency to electric capacity for the voltage.

1st, the transfer characteristic of strip capacitor cell

(1) pumping signal and coordinate system

Strip capacitor cell is placed in the rectangular coordinate system shown in Fig. 2, pole plate plane length b₀, width a₀, dielectric thickness d₀.Three-dimensional simulation puts on the outer surface of capacitor plate, and the contact active force of generation has tri- directions of fx, fy and fz and divides Amount, along x-axis and y-axis, the action direction of fz along oz axle is the action direction of fx and fyDirection, normal direction and tangential stress are one Plant stress tensor, can output capacitance response between the lead of electrode；Normal stress σ_n=fn/a, wherein a=a₀·b₀For pole plate Normal direction stress surface, fn=fz is normal component；Paired tangential stress τ is produced on both side surface_x=fx/a, τ_y=fy/a.

According to the Hooke's law in Elasticity, σ_nAnd τ_x, τ_yElastomer all will be made to produce corresponding deformation.Wherein,

${\mathrm{\σ}}_n=e\·{\mathrm{\ϵ}}_n=e\·{\mathrm{\δ}}_n/d_0=\frac{f_n}{a}---\left(1\right)$

$\&plusminus;{\mathrm{\τ}}_x=\&plusminus;{\mathrm{\γ}}_x\·g=\&plusminus;g\·{\mathrm{\δ}}_x/d_0=\&plusminus;\frac{f_x}{a}---\left(2\right)$

$\&plusminus;{\mathrm{\τ}}_y=\&plusminus;{\mathrm{\γ}}_y\·g=\&plusminus;g\·{\mathrm{\δ}}_y/d_0=\&plusminus;\frac{f_y}{a}---\left(3\right)$

In formula, e is Young's moduluss (unit: the gn/m of elastic fluid²), g is modulus of rigidity (unit: the gn/ of elastic fluid m²), δ n is the Normal Displacement (unit: μm) of elastic fluid, and δ x and δ y be the upper and lower two-plate of capacitor relative dislocation (single Position: μm), its sign is pointed to by coordinate axess and is determined.

(2) capacitance equation and its input-output characteristic

The initial capacitance of rectangular parallel plate capacitor is:

$c_0=\frac{{\mathrm{\ϵ}}_0.{\mathrm{\ϵ}}_r\·a_0\·b_0}{d_0}---\left(4\right)$

In formula, ε₀Vacuum medium electric constant is 8.85pf/m, ε_r=2.5 is dielectric relative dielectric constant.d₀By σ_n's Excitation produces relative deformation ε_n=δ_n/d₀=σ_n/ e, substitutes into (4) and obtains input-output characteristic

$c_n={\mathrm{\ϵ}}_0.{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0(1-{\mathrm{\ϵ}}_n)}={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0(1-\frac{f_n}{ae})}---\left(5\right)$

(3) linearity under normal stress effect and sensitivity

A, the normal direction linearity

F in (5) formula_nIn the denominator, thus c_n=f (f_n) relation be nonlinear, because conversion range in maximum σ_nmaxCompared with dielectric resilient constant e, ε_nThe amount of a very little, i.e. ε in denominator_n< < 1, (5) by series expansion and are omitted secondary Higher-order shear deformation more than side, (5) formula can be reduced to:

$c_n=c_0(1+\mathrm{\&epsiv;})=c_0(1+\frac{f_n}{a\&centerdot;e})---\left(6\right)$

It can be seen that in c_nWith f_nTransfer characteristic in the normal direction linearity maximum relative error close to zero.

B, sensitivity

Definition by normal direction sensitivity

Linear sensitivity can be obtained by (6) formula,

s_n1=c₀/ ae=ε₀ε_r/d₀e (7)

And press (5) formula then

$s_{n2}=\frac{{\mathrm{dc}}_n}{{\mathrm{df}}_n}=c_0\&centerdot;\frac{1}{1-2\mathrm{\&epsiv;}}=c_0\&centerdot;\frac{1}{1-2\frac{f_n}{a\&centerdot;e}}---\left(8\right)$

s_n2With f_nAnd become, f_nBigger, s_n2Bigger, whole transfer characteristic is in mild nonlinear.

(4) tangential stress τ_xAnd τ_yCapacitance variations under excitation

Tangential stress τ_xAnd τ_yDo not change physical dimension parameter b of pole plate₀And a₀, to dielectric thickness d₀Do not produce shadow yet Ring.But τ_xAnd τ_yChange the space structure of strip capacitor cell, between the upper bottom crown faced by forward direction, there occurs dislocation partially Move.Now taking ox direction as a example, pole plate is in τ_xDislocation skew δ under effect_x.

Work as τ in figure 3_xWhen being zero, a_{On 0}=a_{Under 0}Be just to, effective cross-section a between substrate_τ=a₀·b₀；In the diagram, In τ_xIn the presence of dextrad, top crown creates dislocation skew δ to the right with respect to bottom crown_x, so that between upper bottom crown Calculate effective area a during electric capacity_τ=(a₀-δ_x)·b₀；In Fig. 5, work as τ_xDuring for left-hand, dislocation skew δ_xThen to the left, a_τ= (a₀-δ_x)·b₀, τ_xIn left-hand and dextrad, the decrement of effective area is identical, and consequent electric capacity is:

$c_{\mathrm{\&tau;}x}=\frac{{\mathrm{\&epsiv;}}_0.{\mathrm{\&epsiv;}}_r\&centerdot;(a_0-{\mathrm{\&delta;}}_x)\&centerdot;b_0}{d_0}---\left(9\right)$

According to shearing Hooke's law

τ_x=γ_xG=g δ_x/d₀(10)

(10) substitution (9) can be obtained

$c_{\mathrm{\&tau;}x}=c_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;{\mathrm{\&delta;}}_x\&centerdot;b_0}{d_0}=c_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;b_0{\mathrm{\&tau;}}_x}{g}=c_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r{f}_x}{{\mathrm{ga}}_0}---\left(11\right)$

(11) formula is the input-output characteristic under shearing stress, c_τWith τ_xLinear.

And its sensitivity

$s_{\mathrm{\&tau;}x}=\frac{{\mathrm{dc}}_{\mathrm{\&tau;}x}}{{\mathrm{df}}_x}=\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r}{{\mathrm{ga}}_0}---\left(12\right)$

Formula (9)-(12) be similar to analysis is equally applicable and τ_yWith c_τyCharacteristic and technical specification, only strip in formula The long side b of capacitor cell₀Ox direction of principal axis should be arranged at, and its minor face a₀Then in oy direction.

2nd, contact parallel plate capacitor design

(1) planar design of parallel plate capacitor

The original index normal direction Max.contact stress σ setting_nmaxFor 200kpa, if normal direction stress a be square 10 × 10mm², then maximum normal force f_zmaxFor σ_nmaxA=20n.Tangential Max.contact stress τ_maxFor 70kp, the stress of tangential stress Distribution face is 10 × 10mm², then maximum tangential force component f_xmax=f_ymax=τ_maxA=7n.

Strip capacitor cell constructive variations shown in Fig. 4 and Fig. 5, the only output of explanation electric capacity and tangential stress ± τ_xInput Relation, capacitance increase is all negative, and therefore this initial capacitance structure is not suitable for as right ± τ_xObtain increasing and decreasing the sound of electric capacity Should.For this present invention, the initiating structure of bottom crown on strip capacitor cell is adjusted, width is a₀And ka₀Strip electric capacity Unit constitutes a pair of capacitor cell to (c_lWith c_r), specifically as shown in Figure 6.

In Fig. 6, capacitor cell c_lAnd c_rElectrode size b₀、d₀All same, width one is a₀, one is ka₀, wherein k is Constant, preferably greater than 1 integer.Work as τ_xWhen=0, c_l=c₀, c_r=kc₀, on this basis as in f_xExcitation is lower to produce δ_xMistake Offset, it will form offset effect as shown in fig. 4 or 5 by mistake.

$c_l=\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;b_0\&centerdot;(a_0-{\mathrm{\&delta;}}_x)}{d_0}=c_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;b_0{\mathrm{\&tau;}}_x}{g}=c_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r{f}_x}{{\mathrm{ga}}_0}---\left(13\right)$

$c_r=\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;b_0\&centerdot;({\mathrm{ka}}_0-{\mathrm{\&delta;}}_x)}{d_0}={\mathrm{kc}}_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r\&centerdot;b_0{\mathrm{\&tau;}}_x}{g}={\mathrm{kc}}_0-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r{f}_x}{{\mathrm{ga}}_0}---\left(14\right)$

c_lAnd c_rCapacitor cell is in same τ_xδ will be produced_xWith δ c_τResponse.

Thus, formula (11) may be modified such that

$c_{\mathrm{\&tau;}x}=c_{\mathrm{\&tau;}0}-\frac{{\mathrm{\&epsiv;}}_0\&centerdot;{\mathrm{\&epsiv;}}_r}{{\mathrm{ga}}_0}{f}_x$

In formula,It is initial capacitance when zero for shearing stress, it is special that above formula is shearing stress input and output Property, c_τxWith f_xIt is linear relationship, and its sensitivity

Referring to the electrode plane arrangement of Fig. 7, in a 10 × 10mm²Substrate center make ten splittings of words, formed four as Limit, upper right first quartile, upper left second quadrant, lower-left third quadrant, bottom right fourth quadrant, wherein, quadrant be To τ_xRespond capacitor cell combination, and, quadrant be to τ_yThe capacitor cell combination responding.Object-line is 10 ×10mm²Four edge lines of pcb plate, hachure part represents the outer mode cross section of wax-loss casting process.By induction electrode in lower floor Position on pcb substrate should be with pcb substrate edges line as base as reference, then arrangement on the pcb substrate of upper strata for the drive electrode Accurate.Four dashed rectangle of in figure are benchmark on bottom crown for the induction electrode, put them with geometry datum line differential away from being δ₀ (0.1mm).

Capacitor cell module adopts comb structure, and capacitor cell module forms using by plural strip capacitor cell Comb teeth-shaped structure, each strip capacitor cell includes the drive electrode of top crown and the induction electrode of bottom crown.By formula (12)a₀Less, the sensitivity of tangential stress response is bigger, therefore single capacitor cell is strip.If every strip electric capacity list The a width of a of unit₀, the groove width between two strip electric capacity is a_δ, then the pitch of every strip capacitor cell is ka₀+a₀+2a_δ.In order to abundant Using the plane space of square substrate, m (ka₀+a₀+2a_δ)b₀/ 2 ≈ 1 square substrate area, m is strip electric capacity quantity, then have m (ka₀+a₀+2a_δ)=20mm, in formula, groove width a_δUnsuitable excessive, otherwise it is unfavorable for using the effective plane space on substrate, also not Preferably too small, the constraining of wax-loss casting process to be subject to.For making normal direction sensitivity s_nWith tangential sensitivity s_τEqual, by formula (7) and (12), make a₀G=d₀E, works as d₀When=0.1mm, k=1.5, such that it is able to obtain m.

In order to realize τ_xAnd τ_yImpact, the drive electrode length two of strip capacitor cell is not mutually produced between tangential response End reserved difference position δ₀, therefore b_{0 drive}=b_{0 bottom}+2·δ₀, wherein in b_{0 drive}Two ends length is reserved and be should ensure that in difference potential theoryIts value of calculation is ${10}^{-5}\&times;\frac{70\&times;{10}^3}{2.4\&times;{10}^6}=2.9\&times;{10}^{-8}m={10}^{-2}um<<1um,$ Therefore should ensure that in technique b_{0 drive}- b_{0 bottom}≥0.01mm.So when calculating the output response of normal direction electric capacity it is ensured that τ_xAnd τ_yThe response of normal direction electric capacity is not produced and appoint What affects.

In order to realize τ_xAnd τ_yNormal direction electric capacity is not responded and produce any impact, width is a₀And ka₀Strip capacitor cell Constitute a pair of capacitor cell to (c_lWith c_r) carry out publicity reckoning elimination impact each other.Ensure τ_xIn, quadrant electric capacity Unit produces to τ_xElectric capacity response, and then produce to τ in, quadrant capacitor cell_yElectric capacity response, with ensure four as Capacitor cell in limit is in τ_xAnd τ_yTwo groups of differential capacitors pair can be produced under tangential excitation.

(2) calculating of normal stress and tangential force

If width is a in Fig. 6₀Strip capacitor cell by tangential force τ_x, produce tangential displacement d_xOutput afterwards Capacitance is c₁, width is ka₀Strip capacitor cell by tangential force τ_x, produce tangential displacement d_xOutput electricity afterwards Capacitance is c₂, then have:

$c_1=\frac{\mathrm{\&epsiv;}(a_0-d_x)b_0}{d_n}=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(15\right)$

$c_2=\frac{\mathrm{\&epsiv;}({\mathrm{ka}}_0-d_x)b_0}{d_n}=\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(16\right)$

Obtained by (15)-(16):

$c_1-c_2=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}$ It is calculated:

$d_n-\frac{{\mathrm{\&epsiv;a}}_0{b}_0(1-k)}{c_1-c_2}---\left(17\right)$

Obtained by (15) * k- (16):

${\mathrm{kc}}_1-c_2=\frac{{\mathrm{\&epsiv;d}}_x{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;kd}}_x{b}_0}{d_n}=\frac{{\mathrm{\&epsiv;d}}_x{b}_0(1-k)}{d_n},$ (17) are substituted into above formula, can obtain:

$d_x=\frac{a_0({\mathrm{kc}}_1-c_2)}{c_1-c_2}---\left(18\right)$

According to $d_n=d_0-\mathrm{\&delta;}d=d_0(1-\frac{f_n}{e\&centerdot;s_0})$

Understand: $f_n=\frac{(d_n-d_0)e\&centerdot;s_0}{d_0}$

By $\frac{d_x}{d_0}=\mathrm{\&gamma;}=\frac{\mathrm{\&tau;}}{g}=\frac{f_{\mathrm{\&tau;}}}{g\&centerdot;s_0},$ So $f_{\mathrm{\&tau;}x}=\frac{{\mathrm{gs}}_0{d}_x}{d_0}.$

In above formula, either normal direction excitation f_nOr tangentially encourage f_yAll not to o_τProduce impact.Automatically eliminate σ_nAnd τ_y To τ_xThe coupling of total output or interference because every contain in the computing subtracted each other in signal packet, equivalent and the electric capacity with symbol become Change and all automatically eliminate.And f_yAnd f_xTo σ_nInterference can by upper electrode in b₀Direction increases geometrical length 2 δ₀Eliminate.In the same manner may be used To obtain f_τy.

(4) main material selection and its characterisitic parameter

Similar to the sandwich structure shown in Fig. 9, in Fig. 9,1 is upper pcb to the section of structure of comb teeth-shaped plane-parallel capacitor Substrate, 2 is lower pcb substrate, and 3 is drive electrode, and 4 is induction electrode, and 5 is elastic fluid.Pole plate is away from d₀=0.1mm, upper and lower base Plate inner space, in addition to copper foil electrode, is pdms (polydimethylsiloxane) the superlastic insulation with lost wax process filling and is situated between Matter.Its machinery and physical characteristics parameter are Young's moduluss e=6.2mpa, and its shear modulus is g=4.1mpa, medium pole Relative to DIELECTRIC CONSTANT ε during change_γ=2.5.E and g due to medium is much smaller than the elastic modelling quantity e of copper_Copper=103gpa, therefore in capacitor Medium deformation under stress state in portion's is much larger than the deformation of pole plate.

(5) contact conductor design

Either drive electrode or induction electrode all need to have lead-out wire it is considered to each drive electrode in signal level all It is ground connection, therefore four groups of drive electrodes only need to share same lead-out wire.And four the first strip capacitor cell groups and Article 2 The induction electrode of shape capacitor cell group then needs to use each independent lead-out wire, and then whole capacitance component has at least 5 pins Draw from the side of planar package, four induction electrodes refer to that x direction width is a₀Induction electrode and width be ka₀Sensing Electrode, and y direction width be a₀Induction electrode and width be ka₀Induction electrode so that outside whole assembly top and bottom Surface energy is easily contacted with measurement object.The present invention, under the support of new material and new technology, completes a kind of novel three-dimensional The design of power sensitization capacitance combination, in 10 × 10mm²Stress surface on, either normal direction or tangential, all can be more uniform to medium Transmission stress.In literary composition, four cell capacitance are in two to combination distribution.In non-coplanar force and external force in the contact of sensor surface There is 1, electric capacity response but has 4, whole battery lead plate, all to asking fn to contribute, forms system by two to capacitor combination simultaneously, F can be obtained again_xAnd f_yInformation, thus completely describing a three-dimensional force.

Above in conjunction with accompanying drawing, the present invention is exemplarily described it is clear that the present invention implements is not subject to aforesaid way Restriction, as long as employing the improvement of various unsubstantialities that method of the present invention design and technical scheme are carried out, or without changing Enter and the design of the present invention and technical scheme are directly applied to other occasions, all within protection scope of the present invention.This Bright protection domain should be defined by the protection domain that claims are limited.

Claims (8)

1. a kind of tooth general measuring instrument based on detachable facing is it is characterised in that this measuring instrument includes dental articulation collection Unit, odontoseisiies collecting unit, tooth cutting ferrule, data collecting card, data processing unit, wireless communication unit and controller, Described dental articulation collecting unit, odontoseisiies collecting unit are installed on tooth cutting ferrule, and described data collecting card gathers tooth Occlusion collecting unit, the data of odontoseisiies collecting unit, at the information that data collecting card is gathered by described data processing unit Controller is delivered to, described data processing unit, wireless communication unit connect with controller respectively, described wireless communication unit after reason Communicated with long-range receiving unit, described dental articulation collecting unit, odontoseisiies collecting unit are all using thin film three-dimensional force Pressure transducer, described thin film three-dimensional force pressure transducer includes the x direction electric capacity that control unit is connected respectively with control unit Unit group and y direction capacitor cell group, described x direction capacitor cell group and y direction capacitor cell group all include capacitor cell mould Block, described capacitor cell module using the comb teeth-shaped structure being made up of plural strip capacitor cell, each strip electric capacity Unit includes the drive electrode of top crown and the induction electrode of bottom crown；Described capacitor cell module is included by two or more width a₀Length b₀Strip capacitor cell composition the first strip capacitor cell group and two or more width ka₀Length b₀Strip electricity Hold the second strip capacitor cell group of unit composition；The drive electrode of each strip capacitor cell described and induction electrode width phase With the length of drive electrode is more than induction electrode length, and left difference position δ is reserved at drive electrode length two ends respectively_LeftWith right difference position δ_Right, b_{0 drive}=b_{0 sense}+δ_Right+δ_Left, wherein, b_{0 drive}For the drive electrode length of strip capacitor cell, b_{0 sense}Faradism for strip capacitor cell Pole length, described difference position δ_Left=δ_Right, andWherein d₀For strip capacitor cell dielectric thickness, g is elastic fluid Modulus of rigidity, τ_maxFor maximum stress value.

2. tooth general measuring instrument according to claim 1 is it is characterised in that described tooth cutting ferrule includes side set and bottom Set, described side set and bottom set are detachably connected, and described odontoseisiies collecting unit is installed on side and puts, described dental articulation collection Unit is installed on bottom and puts.

3. tooth general measuring instrument according to claim 2 is it is characterised in that described bottom set is included for mutually detachably connecting The bottom set card connecing, bottom covers the bottom set clamping structure that card top and bottom are equipped with card and dental articulation collecting unit, and side set includes For the side set card being mutually detachably connected, side covers the side set clamping dress that card one side is provided with card and odontoseisiies collecting unit Put, be simultaneously provided with the card being seamlessly connected with tooth and device.

4. tooth general measuring instrument according to claim 1 is it is characterised in that described data processing unit includes data mistake Filter unit, data sorting unit, Data Fusion unit database unit, described data filtering units are used for filtering sensing Device collection wrong data, described data sorting unit to filter after data classify, Data Fusion unit according to The data of data sorting unit carries out fusion treatment output two-dimensional data table, and Database Unit is used for storing detection data and standard Data, described normal data is normal tooth data.

5. tooth general measuring instrument according to claim 1 is it is characterised in that described comb teeth-shaped structure includes more than 20 The lead that strip capacitor cell is connected one to one with strip capacitor cell, is provided with electrode between adjacent two strip capacitor cells Spacing a_δ, parallel plate suqare s=m (a₀+2a_δ+ka₀)b₀/ 2, wherein, m is strip capacitor cell quantity, b₀For strip capacitor cell Length, a₀The width of strip capacitor cell.

6. tooth general measuring instrument according to claim 1 is it is characterised in that described first strip capacitor cell group and In parallel or independent mode is connected to control unit to the strip capacitor cell lead of two strip capacitor cell groups.

7. tooth general measuring instrument according to claim 1 is it is characterised in that the width of described strip capacitor cellWherein, d₀For dielectric thickness, e is the Young's moduluss of elastic fluid, and g is the modulus of rigidity of elastic fluid.

8. tooth general measuring instrument according to claim 1 is it is characterised in that described first strip capacitor cell group and It is respectively equipped with intermediate translator, intermediate translator is used for arranging voltage to electric capacity between two strip capacitor cell groups and control unit Or the transmission coefficient to electric capacity for the frequency.