CN105012039B - A kind of tooth general measuring instrument - Google Patents

Abstract

The invention discloses a kind of tooth general measuring instrument, belong to tooth detection field, this measuring instrument includes dental articulation collecting unit, odontoseisis collecting unit, tooth cutting ferrule, data collecting card, data processing unit, wireless communication unit and controller, described dental articulation collecting unit, odontoseisis collecting unit are installed on tooth card and put, data processing unit will deliver to controller after the information processing of data collecting card collection, described dental articulation collecting unit, odontoseisis collecting unit all use thin film three-dimensional force pressure transducer.The present invention by dental articulation collecting unit, the cooperation of odontoseisis collecting unit and accurately measures, and sensor will not be improved, thickness is little, impact on detection accuracy is the least, diagnosis to odontopathy is measured for gmatjpdumamics and treatment has important reference value, solving testing result in prior art inaccurate, difference is big, the insecure problem of data.

Description

A kind of tooth general measuring instrument

Technical field

The invention belongs to tooth detection field, relate to the general measuring instrument accurately measured, be specifically related to a kind of tooth General measuring instrument.

Background technology

Our the damage journey to oral cavity cacodontia can be helped by the measurement of dental articulation power and odontoseisis displacement Degree has an accurate objective understanding, and the diagnosis to multiple periodontal disease has important reference value.

The masticatory pressure produced by the effect of muscle when gmatjpdumamics is the contact of upper lower tooth, this strength is transmitted by tooth It is delivered to jawbone again to periodontal tissue and disperses.Either natural teeth or artificial tooth, they must be by occlusion Power carrys out function.Tooth body, the pathological changes of periodontal necessarily make gmatjpdumamics reduce.After wearing artificial tooth, gmatjpdumamics than Natural teeth is low.Clinical research shows, gmatjpdumamics is one of important symbol of reflection masticatory muscles, stomatognathic system.Logical Cross and measure the size of gmatjpdumamics and can help it is understood that the function status of stomatognathic system, and multiple disease is examined Disconnected offer reference.The illness at each position in top collar portion is all likely to result in the decline of gmatjpdumamics.Remporomandibular joint is disorderly Random patient's gmatjpdumamics is decreased obviously than normal person.Serious error articulation deformity, the acute injury of hinge area is also Significantly reducing of gmatjpdumamics can be caused.Owing to gmatjpdumamics is relevant with multiple disease, therefore in the treatment of a lot of diseases During can as masticatory function recover reference index.

Tooth mobility diagnostic method conventional in current domestic clinical oral is that doctor is by using dental forceps to rock Tested tooth, diagnoses its aeration level.The method lacks objective quantitative criteria, exist simultaneously tester different or It is different that same test person applies power, the problem that diagnostic result is different.

Summary of the invention

In order to overcome above the deficiencies in the prior art, the present invention proposes a kind of tooth general measuring instrument, passes through tooth It is engaged collecting unit, the cooperation of odontoseisis collecting unit and accurately measures, and sensor will not be carried out Improve, thickness is little, and the impact on detection accuracy is the least, for gmatjpdumamics measures the diagnosis to odontopathy with Treatment has important reference value, solves testing result in prior art inaccurate, and difference is big, and data are not Problem reliably.

To achieve these goals, the technical scheme that the present invention takes is: a kind of tooth general measuring instrument, this survey Amount instrument includes dental articulation collecting unit, odontoseisis collecting unit, tooth cutting ferrule, data collecting card, data Processing unit, wireless communication unit and controller, described dental articulation collecting unit, odontoseisis collecting unit Being installed on tooth card to put, described data collecting card gathers dental articulation collecting unit, odontoseisis collecting unit Data, described data processing unit will deliver to controller, described number after the information processing of data collecting card collection Connect with controller respectively according to processing unit, wireless communication unit, described wireless communication unit with remotely receive list Unit communicates, and described dental articulation collecting unit, odontoseisis collecting unit all use thin film three-dimensional force pressure Sensor.Described tooth cutting ferrule includes that side set and the end are overlapped, and described side set and end set removably connect, described tooth Loosening collecting unit is installed on side and puts, and described dental articulation collecting unit is installed on the end and puts.Set bag of the described end Including the end set card for mutually removably connecting, set card top and bottom, the end are equipped with card and dental articulation collecting unit The end set clamping structure, side set include for mutually removably connecting side set card, side set card one side be provided with card Overlapping clamping device with the side of odontoseisis collecting unit, one side is provided with the card with tooth seamless link and device.Institute State data processing unit and include data filtering units, data sorting unit, Data Fusion unit and data base Unit, the wrong data that described data filtering units gathers for filtered sensor, described data sorting unit pair Data after filtration are classified, and Data Fusion unit is carried out at fusion according to the data of data sorting unit Reason output two-dimensional data table, data base is used for storing detection data and normal data, and described normal data is normal Tooth data.

In said apparatus, described thin film three-dimensional force pressure transducer sensor includes control unit and control unit The X-direction differential capacitor unit combination connected respectively and Y-direction differential capacitor unit combine, and described X-direction is poor Dynamic condenser unit is combined through the tangential force of capacitance subtraction calculations X-direction and eliminates the impact of Y-direction tangential force, Described Y-direction differential capacitor unit is combined through the tangential force of capacitance subtraction calculations Y-direction and eliminates X-direction Tangential force affects, the combination of described X-direction differential capacitor unit and the capacitance of Y-direction differential capacitor unit combination The normal force of read group total capacitance sensor and elimination tangential force impact.Described X-direction differential capacitor unit combines All include that two or more mutually forms differential capacitor cell module with the combination of Y-direction differential capacitor unit, described The comb teeth-shaped structure that capacitor cell module is made up of plural strip capacitor cell, each strip electric capacity list Unit includes the drive electrode of top crown and the induction electrode of bottom crown.The driving electricity of described each strip capacitor cell Pole is identical with induction electrode width, and the length of drive electrode is more than induction electrode length, drive electrode length two ends Reserve left poor position δ respectively_LeftWith right poor position δ_Right, b_{0 drives}=b_{0 sense}+δ_Right+δ_Left, wherein, b_{0 drives}For strip electric capacity The drive electrode length of unit, b_{0 sense}Induction electrode length for strip capacitor cell.Described poor position δ_Left=δ_Right, AndWherein d₀For elastic fluid thickness, G is the modulus of rigidity of elastic fluid, τ_maxFor Big stress value.The drive electrode of described two groups of strip capacitor cells mutually forming differential capacitor cell module and Induction electrode is provided with the skew that initially misplaces in the width direction, and dislocation bias size is identical, in opposite direction.Described comb Dentalation includes the lead-in wire that more than 20 strip capacitor cells connect one to one with strip capacitor cell, It is provided with electrode spacing a between adjacent two strip capacitor cells_δ.Described parallel-plate area S=M (a₀+a_δ)b₀, its In, M is strip capacitor cell quantity, b₀For the length of strip capacitor cell, a₀The width of strip capacitor cell Degree.The lead-in wire of each strip capacitor cell of described capacitor cell module in parallel or is independently connected to control Unit.The width of described strip capacitor cellWherein, d₀For elastic fluid thickness, E is elastic The Young's modulus of medium, G is the modulus of rigidity of elastic fluid.Between described control unit and capacitor cell module Be provided with intermediate translator, intermediate translator for arrange voltage to electric capacity or frequency the transmission coefficient to electric capacity.

The medicine have the advantages that the degree of accuracy in order to improve tooth general measuring instrument, the present invention is equipped with tooth Tooth occlusion collecting unit, odontoseisis collecting unit, and for installing the tooth cutting ferrule of collecting unit, each Side set card and end set card and every tooth one_to_one corresponding, normal according to tooth of the size of side set card and end set card Scale little progress row is arranged to one group, the size of thin film three-dimensional force pressure transducer and side set card and end set card one One is corresponding, so can arrange different side set cards and end set card for different teeth, measure for needs Tooth can separately installed measurement tooth side set card and the end set card, it is to avoid impact each other, with Time be also prevented from transmit data impact.In order to improve the sensitivity of thin film three-dimensional force pressure transducer, conversion accuracy And the reliability and stability of touch sensing system, have devised with pcb board as parallel-plate electrode and PDMS For the dielectric layer of base material, planar dimension is 10 × 10mm²Combined electric capacity Sensitive Apparatus.The present invention is passing through On the basis of capacitance measurement three-dimensional force, effectively use platen area, and effectively solve three by the method such as differential Couple between dimension power, so that normal direction and tangential conversion all reach higher linear, precision and sensitivity.

Accompanying drawing explanation

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

Fig. 1 is the work structuring block diagram of the detailed description of the invention of the present invention.

Fig. 2 is strip capacitor cell and the coordinate system thereof of the detailed description of the invention of the present invention.

Fig. 3 is the strip capacitor cell schematic diagram of the detailed description of the invention of the present invention.

Fig. 4 is the strip capacitor cell dextrad skew schematic diagram of the detailed description of the invention of the present invention.

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

Fig. 6 is the initial dislocation figure of the strip capacitor cell pair of the detailed description of the invention of the present invention.

Fig. 7 is that the strip capacitor cell of the detailed description of the invention of the present invention is to deflection graph after stress.

Fig. 8 is the parallel-plate three-dimensional force pressure sensor structure figure of the detailed description of the invention of the present invention.

Fig. 9 is the parallel-plate three-dimensional force pressure transducer drive electrode structure chart of the detailed description of the invention of the present invention.

Figure 10 is the parallel-plate three-dimensional force pressure transducer induction electrode structure of the detailed description of the invention of the present invention Figure.

Figure 11 is being sued for peace by identical carry-over factor K realization output response of the detailed description of the invention of the present invention.

Figure 12 is the differential schematic diagram of signal of the cell capacitance pair of the detailed description of the invention of the present invention.

Figure 13 is the plane-parallel capacitor cross-section structure of the detailed description of the invention of the present invention.

Wherein, 1, upper PCB substrate, 2, lower PCB substrate, 3, drive electrode, 4, induction electrode, 5, Elastic fluid.

Detailed description of the invention

Below against accompanying drawing, by the description to embodiment, the most involved each of the detailed description of the invention of the present invention Mutual alignment and annexation, the effect of each several part between the shape of component, structure, each several part and work former Reason, manufacturing process and operate with method etc., be described in further detail, to help those skilled in the art Inventive concept, the technical scheme of the present invention there is more complete, accurate and deep understanding.

A kind of tooth general measuring instrument, its structured flowchart is as it is shown in figure 1, this measuring instrument includes dental articulation collection Unit, odontoseisis collecting unit, tooth cutting ferrule, data collecting card, data processing unit, radio communication list Unit and controller, described dental articulation collecting unit, odontoseisis collecting unit be installed on tooth card and put, institute Stating data collecting card and gather dental articulation collecting unit, the data of odontoseisis collecting unit, described data process Unit will deliver to controller, described data processing unit, radio communication after the information processing of data collecting card collection Unit connects with controller respectively, and described wireless communication unit communicates with remotely reception unit, described tooth Occlusion collecting unit, odontoseisis collecting unit all use thin film three-dimensional force pressure transducer, remotely receive unit It can be the signal receiver such as mobile phone, server.

Described tooth cutting ferrule includes that side set and the end are overlapped, and described side set and end set removably connect, described odontoseisis Collecting unit is installed on side and puts, and described dental articulation collecting unit is installed on the end and puts.The described end set include for The end set card mutually removably connected, set card top and bottom, the end are equipped with card and the end of dental articulation collecting unit Set clamping structure, side set includes that the side set card for mutually removably connecting, side set card one side are provided with card and tooth The side set clamping device of loose compact collecting unit, one side is provided with the card with tooth seamless link and device.

Side set and the end set respectively by side set card and the end set card formed, each side set card and the end set card and Every tooth one_to_one corresponding, side set card is configured into one with the size of end set card according to the stock size of tooth Group, the size of thin film three-dimensional force pressure transducer and side set card and end set card one_to_one corresponding, so can be with pin Different teeth is arranged different side set cards and end set card, can be separately installed for the tooth needing measurement Measure side set card and the end set card of tooth, it is to avoid impact each other, be also prevented from transmitting data simultaneously Impact.

During installation, the tooth measured for needs, select side set card and the end set card of suitable dimension, then Side set card and end set card according to suitable dimension select suitable thin film three-dimensional force pressure transducer to overlap in side Card and the end set card and, side is overlapped card and the end set card respectively connect composition cutting ferrule and the end set, by cutting ferrule After being displaced into the tooth position overlap needing to measure, side set is fixed on tooth by card and device by side set card On, afterwards end set is installed on side and puts.End set can arrange one side placement tooth according to actual needs and sting Close collecting unit, or dental articulation collecting unit all placed on two sides, so can effectively reduce the thickness of tooth, Improve certainty of measurement.

Described data processing unit include data filtering units, data sorting unit, Data Fusion unit and Database Unit, the wrong data that described data filtering units gathers for filtered sensor, described data are classified Data after filtering are classified by unit, and Data Fusion unit is carried out according to the data of data sorting unit Fusion treatment output two-dimensional data table, data base is used for storing detection data and normal data, described normal data Each item data for normal tooth.

Thin film three-dimensional force pressure transducer includes the differential electricity of X-direction that control unit is connected respectively with control unit Holding unit combination and Y-direction differential capacitor unit combines, described X-direction differential capacitor unit is combined through electric capacity The tangential force of value subtraction calculations X-direction and elimination Y-direction tangential force impact, described Y-direction differential capacitor unit It is combined through the tangential force of capacitance subtraction calculations Y-direction and eliminates the impact of X-direction tangential force, described X-direction The capacitance read group total capacitance sensor of the combination of differential capacitor unit and the combination of Y-direction differential capacitor unit Normal force and elimination tangential force impact.The combination of described X-direction differential capacitor unit and Y-direction differential capacitor unit Combination all includes that two or more mutually forms differential capacitor cell module, and described capacitor cell module uses by two The comb teeth-shaped structure of individual above strip capacitor cell composition, each strip capacitor cell includes the driving of top crown Electrode and the induction electrode of bottom crown.The drive electrode of described each strip capacitor cell and induction electrode width phase With, the length of drive electrode is more than induction electrode length, and left poor position is reserved at drive electrode length two ends respectively δ_LeftWith right poor position δ_Right, b_{0 drives}=b_{0 sense}+ δ_Right+ δ_Left, wherein, b_{0 drives}Drive electrode for strip capacitor cell Length, b_{0 sense}Induction electrode length for strip capacitor cell.Described poor position δ_Left=δ_Right, andWherein d₀For elastic fluid thickness, G is the modulus of rigidity of elastic fluid, τ_maxFor maximum Stress value.The drive electrode of described two groups of strip capacitor cells mutually forming differential capacitor cell module and sense Answering electrode to be provided with the skew that initially misplaces in the width direction, dislocation bias size is identical, in opposite direction.Described comb Shape structure includes the lead-in wire that more than 20 strip capacitor cells connect 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 area S=M (a₀+a_δ)b₀, wherein, M is all strip capacitor cell quantity, b₀For the length of strip capacitor cell, a₀The width of strip capacitor cell. The lead-in wire of each strip capacitor cell of described capacitor cell module in parallel or is independently connected to control list Unit.The width of described strip capacitor cellWherein, d₀For dielectric thickness, E is elastic fluid Young's modulus, G is the modulus of rigidity of elastic fluid.In being provided with between described control unit and capacitor cell module Between changer, intermediate translator for arrange voltage to electric capacity or frequency the transmission coefficient to electric capacity.

1, 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、 Elastic fluid thickness d₀.Three-dimensional simulation puts on the outer surface of capacitor plate, and the contact active force of generation has Tri-durection components of Fx, Fy and Fz, the action direction of Fx and Fy is along X-axis and Y-axis, the action direction edge of Fz OZ axle, i.e.Direction, normal direction and tangential stress are a kind of stress tensor, the most exportable between the lead-in wire of electrode The response of electric capacity；Normal stress σ_n=Fn/A, wherein A=a₀·b₀For pole plate normal direction stress surface, Fn=Fz For normal component；Paired tangential stress τ is produced in 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.Its In,

${\mathrm{\σ}}_n=E\·{\mathrm{\ϵ}}_n=E\·{\mathrm{\δ}}_n/d_0=\frac{F_n}{A}---\left(1\right)$

$\±{\mathrm{\τ}}_x=\±{\mathrm{\γ}}_x\·G=\±G\·{\mathrm{\δ}}_x/d_0=\±\frac{F_x}{A}---\left(2\right)$

$\±{\mathrm{\τ}}_y=\±{\mathrm{\γ}}_y\·G=\±G\·{\mathrm{\δ}}_y/d_0=\±\frac{F_y}{A}---\left(3\right)$

In formula, E is Young's modulus (unit: the GN/m of elastic fluid²), G is the modulus of rigidity of elastic fluid (unit: GN/m²), δ n is the Normal Displacement (unit: μm) of elastic fluid, and δ x and δ y is strip electricity Holding the relative dislocation (unit: μm) of the upper and lower two-plate of unit, its sign is pointed to by coordinate axes and is determined.

(2) capacitance equation and input-output characteristic thereof

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_nExcitation produce relative deformation ε_n=δ_n/d₀=σ_n/ E, substitutes into (4) and obtains input-output characteristic

$C_n={\mathrm{\ϵ}}_0.{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0(1-{\mathrm{\ϵ}}_n)}={\mathrm{\ϵ}}_0\·{\mathrm{\ϵ}}_r\frac{a_0\·b_0}{d_0\left(1\frac{F_n}{AE}\right)}---\left(5\right)$

(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 of conversion range in Maximum σ_nmaxCompared with dielectric resilient constant E, ε_nA least amount, i.e. ε in denominator_n< < 1, by (5) By series expansion the higher-order shear deformation that omits more than quadratic power, (5) formula can be reduced to:

$C_n=C_0(1+\mathrm{\&epsiv;})=C_0\left(1+\frac{F_n}{A\&CenterDot;E}\right)---\left(6\right)$

Visible at C_nWith F_nTransfer characteristic in the maximum relative error of the normal direction linearity 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)

By (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, in mild nonlinear in whole transfer characteristic.

(4) tangential stress τ_xAnd τ_yCapacitance variations under Ji Li

Tangential stress τ_xAnd τ_yDo not change physical dimension parameter b of pole plate₀And a₀, to dielectric thickness d₀Do not produce Raw impact.But τ_xAnd τ_yChange the space structure of plane-parallel capacitor, between the upper bottom crown faced by forward There occurs dislocation skew.Now as a example by OX direction, pole plate is at τ_xDislocation skew δ under Zuo Yong_x。

Work as τ in figure 3_xWhen being zero, a_{On 0}=a_{0 time}Be just to, effective cross-section A between substrate_τ=a₀·b₀； In the diagram, at τ_xUnder the effect of dextrad, top crown creates dislocation skew δ to the right relative to bottom crown_x, So that between upper bottom crown calculate electric capacity time effective area A_τ=(a₀-δ_x)·b₀；In Fig. 5, Work as τ_xDuring for left-hand, dislocation skew δ_xThe most to the left, A_τ=(a₀-δ_x)·b₀, the minimizing of effective area Measuring identical, 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) input-output characteristic under formula is shearing stress, C_τWith τ_xLinear.

And its sensitivity

$S_{\mathrm{\&tau;}x}=\frac{{\mathrm{dC}}_{\mathrm{\&tau;}x}}{{\mathrm{dF}}_x}=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}---\left(12\right)$

The similar analysis in formula (9)-(12) is equally applicable and τ_yWith C_τyCharacteristic and technical specification, only the most not Cross the long limit b of strip capacitor cell in formula₀Should be arranged at OX direction of principal axis, and its minor face a₀Then in OY direction.

(5) introduction of differential capacitor unit

Capacitor arrangement change 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 the most this initial capacitance structure is not suitable for as right ± τ_xIncreased and decreased The response of electric capacity.For this present invention, the initiating structure of bottom crown on capacitor is adjusted, constitutes pair of differential Electric capacity is to (C_LWith C_R), the most as shown in Figure 6.

In Fig. 6, a pair electric capacity C_LAnd C_RElectrode size a₀、b₀、d₀The most identical, initial dislocation skew δ₀Also phase With, difference is left side capacitor C_LUpper strata δ₀Wedge angle be oriented to+OX, and the right capacitor C_RUpper strata δ₀Point Angle sensing-OX.

Work as τ_xWhen=0, $C_L=C_R=C_{{\mathrm{\&tau;}}_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;\left({\mathrm{\&delta;}}_0\right)\&CenterDot;b_0}{d_0},$ I.e. in figure corresponding to dash area Electric capacity, on this basis as at-F_xLower generation ± the δ of excitation_xMistake skew, form electric capacity as shown in Figure 7 Increase and decrease effect.

$C_L=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;(a_0-{\mathrm{\&delta;}}_0\&PlusMinus;{\mathrm{\&delta;}}_x)}{d_0}---\left(13\right)$

C in Fig. 7_LAnd C_RDifferential capacitor is to same τ_xBy generation ± δ_xWith ± Δ C_τResponse. $\&PlusMinus;{\mathrm{\&delta;}}_x=\&PlusMinus;d_0\frac{{\mathrm{\&tau;}}_x}{E};$

δ₀Size should meetDesirable δ₀=10 μm, thus, formula (11) May be modified such that

$C_{\mathrm{\&tau;}x}=C_{\mathrm{\&tau;}0}\&PlusMinus;\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}{F}_x---\left(14\right)$

In formula,Being initial capacitance when zero for shearing stress, (14) formula is to cut and answers Power input-output characteristic, C_τxWith F_xIt is linear relationship, and its sensitivity

2, contact parallel plate capacitor design

(1) planar design of parallel plate capacitor

See the electrode plane in Fig. 8, Fig. 9 and Figure 10 to arrange, at a 10 × 10mm²Substrate center make Ten splittings of words, form four quadrants I, II, III, IV, and wherein I, II quadrant is to τ_xThe difference responded Dynamic condenser unit combines, and III, IV quadrant is to τ_yThe differential capacitor unit combination responded.Object-line is 10×10mm²Four edge lines of pcb board, PCB substrate should accurately be cut the essence ensureing in shape and size Accurate.Hachure part represents the outer mode cross section of wax-loss casting process, and its geometry and size also should be mechanical-moulded Time keep precisely, tear open for being convenient in demoulding and can spell, more should maintain dimensional accuracy, finally to ensure to eliminate three-dimensional force Electric capacity response is interfered.

Capacitor cell module uses the comb teeth-shaped structure being made up of plural strip capacitor cell, each strip Capacitor cell includes the drive electrode of top crown and the induction electrode of bottom crown.By formula (12) a₀The least, cut The biggest to the sensitivity of stress response, therefore single electric capacity is strip.If the every a width of a of strip capacitor cell₀, Groove width between two strip capacitor cells is a_δ, then the pitch of every strip capacitor cell is a₀+a_δ.In order to fill Divide the plane space utilizing square substrate, make M (a₀+a_δ)b₀≈ 1 square substrate surface area, M is 4 Strip capacitor cell number in quadrant, then have M (a₀+a_δ)=2*10mm, in formula, groove width a_δUnsuitable excessive, no Then it is unfavorable for using the effective plane space on substrate, also unsuitable too small, to be retrained by wax-loss casting process. For making normal direction sensitivity S_nWith tangential sensitivity S_τIdentical, by formula (7) and (12), make a₀G=d₀E, Work as d₀During=0.1mm, then a₀=0.15mm, if making a_δ=0.05mm, then M=100, each quadrant has 25 Individual strip capacitor cell.

In order to realize τ_xAnd τ_yBetween tangential response the most mutually produce impact, drive electrode length two ends are reserved δ₀, therefore b_{0 drives}=b_{0 end}+2·δ₀, wherein at b_{0 drives}Two ends length is reserved be should ensure that in theory ${\mathrm{\&delta;}}_0\&GreaterEqual;d_0\&CenterDot;\frac{{\mathrm{\&tau;}}_{y\max }}{G},$ Its 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 in work B is should ensure that in skill_{0 drives}-b_{0 end}≥0.01mm.So can guarantee that when calculating the output response of normal direction electric capacity τ_xAnd τ_yThe response of normal direction electric capacity is not produced any impact.

In order to realize τ_xAnd τ_yThe response of normal direction electric capacity is not produced any impact, the driving of each strip capacitor cell Electrode and induction electrode horizontal layout in all quadrants should ensure that certain dislocation skew, by differential elimination shadow Ring, take induction electrode position in lower floor's PCB substrate as reference, then drive electrode is in upper strata PCB substrate On layout should be on the basis of PCB substrate edge line.In figure, four dashed rectangle are that induction electrode is on bottom crown Benchmark.And put them with geometry datum line differential away from being δ₀(0.1mm), to ensure τ_xAt I, II quadrant electricity Hold unit and produce differential capacitor output response, then produce τ at III, IV quadrant capacitor cell_yDifferential capacitor Response, arranges an initial dislocation skew δ_xo, its value should ensure thatIts value of calculation and δ₀It is similar, Its skew that initially misplaces is respectively provided with δ_xo=δ_yo=0.01mm, to ensure that capacitor cell in four quadrants is at τ_xAnd τ_y Two groups of differential capacitors pair can be produced under tangential excitation.C in the figure 7_τxI=C_RAnd C_τxII=C_LFor conversion τ_xDifference Dynamic condenser pair, and C_τxIII=C_LAnd C_τxIV=C_RThen for conversion τ_yDifferential capacitor pair.

(2) normal stress calculates

Electric capacity is responded by the normal direction of the rewritable single capacitor of formula (6)

$C_{ni}=N\left(C_0+\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;Fn}{d_{0}E}\right)---\left(15\right)$

Wherein, i=I, II, III, IV, because, in each quadrant, N refers to the strip capacitor cell of each quadrant Quantity, N number of strip capacitor cell is in parallel.

As sued for peace again, can obtainAbove formula is σ_n's Electric capacity overall response.

Although the summation of single electric capacity can by contact conductor be connected in parallel realization.But once and connect, the most not Can realize asking subtractive combination again, the summation on historical facts or anecdotes border is combined the output of intermediate translator to be passed through and is sued for peace, sees figure 11, the signal flow block diagram of summation

In figure, intermediate translator K can be voltage to electric capacity or frequency the transmission coefficient to electric capacity, thus complete Synthesis to normal direction response.

$O_n=4KN\left(C_0+\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;Fn}{d_{0}E}\right)---\left(16\right)$

(3) tangential stress calculates

C_ITo C_IIAnd C_IIITo C_IVCan realize two to differential combination, seeing Figure 12, process through differential technique, poor The overall response of dynamic output

$O_{\mathrm{\&tau;}x}=\frac{2{\mathrm{NK\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{a_{0}G}{F}_x---\left(17\right)$

In above formula, either normal direction excitation F_nOr tangentially encourage F_yThe most not to O_τxProduce impact.I.e. automatically, eliminate σ_nAnd τ_yTo τ_xThe coupling of total output or interference because every in signal packet containing in the computing subtracted each other, equivalent The most automatically eliminate with the capacitance variations met.And F_yAnd F_xTo σ_nInterference can by upper electrode at b₀Direction Increase geometrical length 2 δ₀Eliminate, O_τyIn like manner can ask.

(4) main material selection and characterisitic parameter thereof

The section of structure of comb teeth-shaped plane-parallel capacitor is similar to the sandwich structure shown in Figure 13.Figure 13 In, 1 is upper PCB substrate, and 2 is lower PCB substrate, and 3 is drive electrode, and 4 is induction electrode, and 5 is elastic Medium.

Pole plate is away from d₀=0.1mm, outside upper and lower base plate inner space copper removal foil electrode, is and uses lost wax process PDMS (polydimethylsiloxane) the superlastic dielectric of filling.Its machinery and physical characteristic parameter are Young Modulus E=6.2MPa, and its shear modulus is G=4.1MPa, relative dielectric constant during dielectric polorization ε_Y=2.5.E and G due to medium is much smaller than the elastic modulus E of copper_Copper=103GPa.Therefore capacitor internal medium Deformation under stress state 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 is in signal level On be all ground connection, therefore four groups of drive electrodes only need to share same lead-out wire.And four capacitor cell module senses Answering electrode then to need to use the most independent lead-out wire, total at least 5 pins of the most whole capacitance component seal from plane Dress side draw, in order to whole assembly top and bottom outer surface can easily with measure object contact.

The present invention, under the support of new material and new technology, completes a kind of novel three-dimensional power sensitization capacitance combination Design, at 10 × 10mm²Stress surface on, either normal direction or tangential, all can be to the more uniform biography of medium Pass stress.In literary composition, four cell capacitance are two to combination distribution.China and foreign countries are contacted at non-coplanar force and sensor surface Power only has 1, and electric capacity response but has 4, to 4 available normal direction F of electric capacity summation_nInformation, the most whole Battery lead plate is all to seeking F_nContribute, by two, capacitor combination is formed differential system simultaneously, F can be obtained again_xAnd F_y Information, thus a three-dimensional force is completely described.These 4 cell capacitance combinations should complete its basic function, Not interfereing with each other again, this is just to be achieved by design concept cleverly, the normal direction once changed by design parameter Sensitivity and tangential sensitivity and maximum linear error, can be that colleague developer offers reference whereby.

Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by upper State the restriction of mode, as long as have employed the various unsubstantialities that method is conceived and technical scheme is carried out of the present invention Improve, or the most improved design by the present invention and technical scheme directly apply to other occasion, all at this Within bright protection domain.The protection domain that protection scope of the present invention should be limited with claims as Accurate.

Claims (8)

1. a tooth general measuring instrument, it is characterised in that this measuring instrument includes dental articulation collecting unit, odontoseisis collection Unit, tooth cutting ferrule, data collecting card, data processing unit, wireless communication unit and controller, described dental articulation collection Unit, odontoseisis collecting unit are installed on tooth card and put, and described data collecting card gathers dental articulation collecting unit, tooth Loosening the data of collecting unit, described data processing unit delivers to controller by after the information processing of data collecting card collection, described Data processing unit, wireless communication unit connect with controller respectively, and described wireless communication unit leads to remotely reception unit Letter, described dental articulation collecting unit, odontoseisis collecting unit all use thin film three-dimensional force pressure transducer；

Described thin film three-dimensional force pressure transducer includes the X-direction differential capacitor unit that control unit is connected respectively with control unit Combination and Y-direction differential capacitor unit combine, and described X-direction differential capacitor unit is combined through capacitance subtraction calculations X-direction Tangential force and eliminate Y-direction tangential force impact, described Y-direction differential capacitor unit is combined through capacitance subtraction calculations Y side To tangential force and eliminate X-direction tangential force impact, described X-direction differential capacitor unit combination and Y-direction differential capacitor unit The normal force of the capacitance read group total capacitance sensor of combination and elimination tangential force impact, described X-direction differential capacitor unit group Close and the combination of Y-direction differential capacitor unit all includes that two or more mutually forms differential capacitor cell module, described capacitor cell The comb teeth-shaped structure that module is made up of plural strip capacitor cell, each strip capacitor cell includes the driving of top crown Electrode and the induction electrode of bottom crown；

Described tooth cutting ferrule includes that side set and the end are overlapped, and described side set and end set removably connect, and described odontoseisis collecting unit is pacified Being loaded on side to put, described dental articulation collecting unit is installed on the end and puts.

Tooth general measuring instrument the most according to claim 1, it is characterised in that set of the described end includes for mutually detachably connecting Connect the end set card, the end set card top and bottom be equipped with card and dental articulation collecting unit the end overlap clamping structure, side overlap include for Mutually removably connect side set card, side set card one side be provided with card and odontoseisis collecting unit side overlap clamping device, one Face is provided with the card with tooth seamless link and device.

Tooth general measuring instrument the most according to claim 1, it is characterised in that described data processing unit includes data mistake Filter unit, data sorting unit, Data Fusion unit and Database Unit, described data filtering units is used for filtering sensing Device gather wrong data, described data sorting unit to filter after data classify, Data Fusion unit is according to number Carrying out fusion treatment output two-dimensional data table according to the data of taxon, Database Unit is used for storing detection data and normal data, Described normal data is normal tooth data.

Tooth general measuring instrument the most according to claim 1, it is characterised in that the driving of described each strip capacitor cell Electrode is identical with induction electrode width, and the length of drive electrode is more than induction electrode length, and drive electrode length two ends are reserved respectively Left poor position δ_LeftWith right poor position δ_Right, b_{0 drives}=b_{0 sense}+δ_Right+δ_Left, wherein, b_{0 drives}For the drive electrode length of strip capacitor cell, b_{0 sense}For the induction electrode length of strip capacitor cell, described poor position δ_Left=δ_Right, andWherein d₀It is situated between for elasticity Matter thickness, G is the modulus of rigidity of elastic fluid, τ_maxFor maximum stress value.

Tooth general measuring instrument the most according to claim 1, it is characterised in that described in mutually form differential capacitor cell The drive electrode of the strip capacitor cell of module and induction electrode are provided with the skew that initially misplaces in the width direction, and misplace bias size phase Same, in opposite direction.

Tooth general measuring instrument the most according to claim 1, it is characterised in that described comb teeth-shaped structure includes more than 20 The lead-in wire that strip capacitor cell connects one to one with strip capacitor cell, is provided with between electrode between adjacent two strip capacitor cells Away from a_δ, the lead-in wire of each strip capacitor cell of described capacitor cell module is connected to control unit by independent mode.

Tooth general measuring instrument the most according to claim 1, it is characterised in that the width of described strip capacitor cellWherein, d₀For elastic fluid thickness, E is the Young's modulus of elastic fluid, and G is the modulus of rigidity of elastic fluid.

Tooth general measuring instrument the most according to claim 1, it is characterised in that described control unit and capacitor cell module Between be provided with intermediate translator, intermediate translator for arrange voltage to electric capacity or frequency the transmission coefficient to electric capacity.