CN105105712A - Wearable health monitoring equipment based on three-dimensional pressure detection - Google Patents

Abstract

The invention relates to wearable health monitoring equipment based on a three-dimensional pressure detection, and belongs to the technical field of wearable equipment. The monitoring equipment comprises a plurality of movable monitoring points and a processor, wherein the movable monitoring points on clothing are attached to the skin; micro processors and three-dimensional pressure sensors for monitoring pressure on points to be monitored are arranged in the movable monitoring points; the three-dimensional pressure sensors are connected with the micro processors, and the micro processors send wireless signals; the processor is wirelessly connected with the movable monitoring points to receive monitoring signals sent by the micro processors; a warning unit and a threshold value unit are arranged in the processor and are connected to the processor; if the monitoring signals are larger than values set by the threshold value unit, the warning unit sends a warning signal. The volumes of the monitoring points are greatly reduced by use of the micro sensors; furthermore, the monitoring points are independent and can be used selectively; the problem that the volumes and the functions of the monitoring points cannot meet the demands of customers at the same time is solved; the wearable health monitoring equipment is small in size and high in measurement precision.

Description

Based on the wearable health monitoring equipment that three-dimensional pressure detects

Technical field

The invention belongs to wearable device technical field, relate to automatic monitoring technical direction, be specifically related to a kind of wearable health monitoring equipment detected based on three-dimensional pressure.

Background technology

Along with embedded and development that is mobile technology, wearable device is own through progressing into market.On the one hand, wearable device is due to the direct physical contact of itself and user, than the subscriber equipment (such as portable equipment) of other types, there is more complicated form, such as, be worn on the head of user, the wearable device of hand or metastomium, often morphological differences is very large, so that the wearing of user.On the other hand, the function of wearable device is also at the future development towards the division of labor that becomes more meticulous, and such as, wearable device can keep a record to different objects or perception, comprise: the humidity of environment, temperature, composition, quality, and the body temperature of user, blood pressure, blood oxygen etc.

Therefore, the trends of design of wearable device is more and more tending towards microminiaturized, person easy to use carries and Dermallly affixed setting, intelligent wrist-watch and intelligent product of dressing is had to come out, but function singleness can not user's request, so the volume size of multi-functional wearable device is a problem demanding prompt solution.

Summary of the invention

According to above the deficiencies in the prior art, the present invention proposes a kind of wearable health monitoring equipment detected based on three-dimensional pressure, by the volume using three-dimensional pressure sensor to substantially reduce monitoring point, and independent during monitoring point, optionally use, solve the problem that the volume of monitoring point and function can not meet consumer simultaneously, there is volume little, certainty of measurement is high, and function is many, but also the advantage that can expand.

To achieve these goals, the technical scheme that the present invention takes is: a kind of wearable health monitoring equipment detected based on three-dimensional pressure, described monitoring equipment comprises: multiple removable monitoring point, removable monitoring point is worn on clothing and is attached to skin, the three-dimensional pressure sensor of the pressure size that microprocessor is subject to monitoring tested point is provided with in removable monitoring point, three-dimensional pressure sensor connects microprocessor, microprocessor sends wireless signal, three-dimensional pressure sensor is contact parallel-plate three-dimensional force sensor, sensor comprises control unit, the X-direction capacitor cell group be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown, described capacitor cell module comprises by two or more width a ₀length b ₀strip capacitor cell composition the first strip capacitor cell group and two or more width ka ₀length b ₀strip capacitor cell composition the second strip capacitor cell group, processor, the removable monitoring point of wireless connections receives the monitor signal that microprocessor sends, and be provided with alarm unit and threshold cell in processor, alarm unit and threshold value are connected to processor, monitor signal exceedes the value of threshold cell setting, and alarm unit sends alarm signal.

In the said equipment, the drive electrode of described each strip capacitor cell is identical with induction electrode width, and the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved 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 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, and wherein d ₀for strip capacitor cell dielectric thickness, G is the modulus of rigidity of elastic fluid, τ _maxfor maximum stress value.The lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ, described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.The strip capacitor cell lead-in wire of described first strip capacitor cell group and the second strip capacitor cell group is by parallel way or be independently connected to control unit.The width of described strip capacitor cell wherein, d ₀for dielectric thickness, E is the Young's modulus of elastic fluid, and G is the modulus of rigidity of elastic fluid.Described first strip capacitor cell group and be respectively equipped with intermediate translator between the second strip capacitor cell group and control unit, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.

Also be provided with reception antenna and trigger element in described removable monitoring point, reception antenna connects on the microprocessor, is charged by reception antenna in removable monitoring point, and trigger element connects microprocessor, and trigger element controls the duty of removable monitoring point.Also comprise transmitting antenna and power supply in described processor, power supply and transmitting antenna connection handling device, processor carries out wireless charging electric discharge through transmitting antenna.Also comprise selector switch in described processor, the selector switch in processor is arranged corresponding to each removable monitoring point, the duty of the removable monitoring point of selector switch controlled in wireless.Be provided with sound circuit and remote signal circuit in alarm unit in described processor, processor gives by the remote signal circuit group photos and sending messages of alarm unit the guardian dressing monitoring equipment.

Beneficial effect of the present invention is: provide removable monitoring point to be worn on the stressing conditions of clothing being monitored tested point in the present invention, the function of other sensor elements expansion monitoring point can be increased as required, use three-dimensional pressure sensor in monitoring point simultaneously, influence each other by effectively solving three-dimensional force, thus make normal direction and tangential conversion all reach higher linear, precision and sensitivity.Be provided with antenna in monitoring point simultaneously and carry out wireless charging, facilitate the process of charging, processor also self can carry out wireless charging electric discharge while providing electric energy to monitoring point.In addition, when wearer occur unexpected or initiatively want to give the alarm signal time, can sending bulk message to guardian, also can cancel the transmission of information, avoid the popular feeling that error situation causes anxious.

Accompanying drawing explanation

Below the content expressed by this Figure of description and the labelling in figure are briefly described:

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

Fig. 2 is strip capacitor cell and the coordinate system thereof 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 a ₀and ka ₀electric capacity to stressed 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 that the cell capacitance of the specific embodiment of the present invention is right.

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

Figure 10 is the work block diagram of the removable monitoring point of the specific embodiment of the present invention.

Figure 11 is the work block diagram of the processor of the specific embodiment of the present invention.

In figure, 1 is upper PCB substrate, and 2 is lower PCB substrate, and 3 is drive electrode Copper Foil, and 4 is induction electrode Copper Foil, and 5 is elastic fluid.

Detailed description of the invention

Contrast accompanying drawing below, by the description to embodiment, the specific embodiment of the present invention is as the effect of the mutual alignment between the shape of involved each component, structure, each several part and annexation, each several part and operation principle, manufacturing process and operation using method etc., be described in further detail, have more complete, accurate and deep understanding to help those skilled in the art to inventive concept of the present invention, technical scheme.

The invention provides a kind of wearable health monitoring equipment detected based on three-dimensional pressure, its operating diagram as shown in Figure 1, use three-dimensional pressure sensor to form monitoring equipment in the present invention thus greatly reduce the volume of monitoring equipment, pass through wireless power, reduce the volume of monitoring point, energy-storage units and power supply be set in the volume increasing monitoring equipment to a certain extent.And removable monitoring point is undertaken being connected by wireless charging and processor, data transmission, avoid the loaded down with trivial details of data wire and use restriction, simultaneous processor also can be connected in computer and carry out detailed data analysis, amplification data, the little the small screen of processor is checked data are very tired.

Wearable health monitoring equipment comprises multiple removable monitoring point and processor, and removable monitoring point is monitoring point independent one by one, can engage in clothing and be attached on skin, then wireless connections processor.Removable monitoring point individualism work wireless connections processor, removable monitoring point is dismountable to be attached in clothing, and monitoring point volume is little, thickness is thin, sense of discomfort can not be caused, facility easy to use, and detachably change installation site, simultaneously also can unrestricted choice can the usage quantity of monitoring point.

The profile of removable monitoring point is hidden discount shape, and volume is little, and major function is the stressed size of monitoring point to be monitored; thus boundary belt monitoring point, when old man or the wounded dress, thus the stressed size of moment monitoring tested point; record tested point even in everyday situations, thus protection user is looked after one's health.Removable monitoring point comprises monitoring element and the shell of acquired signal; monitoring element is installed in the enclosure; releasably can also engage attaching while shell monitoring for protection element is installed on clothing, and the one side of monitoring element is attached to skin, and another side is hidden in the enclosure.

Monitoring element in removable monitoring point comprises microprocessor, three-dimensional pressure sensor, signal projector, micro power, reception antenna, three-dimensional pressure sensor connects the signal incoming end of microprocessor, signal projector connects the signal output part of microprocessor, micro power provides electric energy to the work of monitoring point, reception antenna tiling is arranged on monitoring point, connects microprocessor.In order to the element of all right mounting temperature sensor of the function increasing monitoring point, heartbeat sensor, pulse transducer etc. monitoring body signal, increase using function, all belong in the scope of the invention.

Contact parallel-plate three-dimensional force sensor selected by three-dimensional pressure sensor in the present invention, the X-direction capacitor cell group that sensor comprises control unit, be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, and each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.Described capacitor cell module comprises by two or more width a ₀length b ₀first strip capacitor cell group of strip capacitor cell composition and two or more width ka ₀length b ₀second strip capacitor cell group of strip capacitor cell composition.The drive electrode of described each strip capacitor cell is identical with induction electrode width, and the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved 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 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, and wherein d ₀for dielectric thickness, G is the modulus of rigidity of elastic fluid, τ _maxfor maximum stress value.The lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ.Described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.The strip capacitor cell lead-in wire of described first strip capacitor cell group and the second strip capacitor cell group is by parallel connection or be independently connected to control unit.The width of described strip capacitor cell wherein, d ₀for dielectric thickness, E is the Young's modulus of elastic fluid, and G is the modulus of rigidity of elastic fluid.Described first strip capacitor cell group and be provided with intermediate translator between the second strip capacitor cell group and control unit, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of 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 b ₀, width a ₀, dielectric thickness d ₀.Three-dimensional simulation puts on the outer surface of capacitor plate, and the contact active force of generation has Fx, Fy and Fz tri-durection components, and the action direction of Fx and Fy is along X-axis and Y-axis, and the action direction of Fz along OZ axle namely direction, normal direction and tangential stress are a kind of stress tensor, can output capacitance respond between the lead-in wire of electrode; Normal stress σ _n=Fn/A, wherein A=a ₀b ₀for pole plate normal direction stress surface, Fn=Fz is normal component; Both side surface produces paired tangential stress τ _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 distortion.Wherein,

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

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

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

In formula, E is the Young's modulus (unit: GN/m of elastic fluid ²), G is the modulus of rigidity (unit: GN/m of elastic fluid ²), δ n is the Normal Displacement (unit: μm) of elastic fluid, and δ x and δ y is the relative dislocation (unit: μm) of the upper and lower two-plate of capacitor, and its sign is pointed to by coordinate axes and 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, ε ₀vacuum medium electric constant is 8.85PF/m, ε _r=2.5 is dielectric relative dielectric constant.D ₀by σ _nexcitation produce relative deformation ε _n=δ _n/ d ₀=σ _n/ E, substitutes into (4) and obtains input-output characteristic

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

(3) linearity under normal stress effect and sensitivity

A, the normal direction linearity

F in (5) formula _nin the denominator, therefore C _n=f (F _n) relation be nonlinear, because of conversion range in maximum σ _nmaxcompared with dielectric resilient constant E, ε _na very little amount, i.e. ε in denominator _n<<1, (5) are omitted the higher-order shear deformation of more than quadratic power by series expansion, and (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

By the definition of normal direction sensitivity

Can linear sensitivity be obtained by (6) formula,

S _n1＝C ₀/AE＝ε ₀ε _r/d ₀E(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 _nlarger, S _n2larger, in mild nonlinear in whole transfer characteristic.

(4) tangential stress τ _xand τ _ycapacitance variations under excitation

Tangential stress τ _xand τ _ydo not change the physical dimension parameter b of pole plate ₀and a ₀, to dielectric thickness d ₀also do not have an impact.But τ _xand τ _ychange the space structure of strip capacitor cell, between the upper bottom crown faced by forward, there occurs dislocation skew.Now for OX direction, pole plate is at τ _xdislocation skew δ under effect _x.

Work as τ in figure 3 _xwhen being zero, a _{on 0}=a _{0 time}just right, effective cross-section A between substrate _τ=a ₀b ₀; In the diagram, at τ _xunder the effect of dextrad, top crown creates dislocation skew δ to the right relative to bottom crown _x, thus make the effective area A between bottom crown when calculating electric capacity _τ=(a ₀-δ _x) b ₀; In Fig. 5, work as τ _xduring for left-hand, dislocation skew δ _xthen left, A _τ=(a ₀-δ _x) b ₀, τ _xwhen left-hand and dextrad, the reduction of effective area is identical, and consequent electric capacity is:

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

According to shearing Hooke's law

τ _x＝γ _x·G＝G·δ _x/d ₀(10)

(10) are substituted into (9) can obtain

$C_{\mathrm{\&tau;}x}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;{\mathrm{\&delta;}}_x\&CenterDot;b_0}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;{\mathrm{\&tau;}}_x}{G}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r{F}_x}{{\mathrm{Ga}}_0}---\left(11\right)$

(11) formula is the input-output characteristics under shearing stress, C _τwith τ _xlinear.

And its sensitivity

The similar analysis in formula (9)-(12) is suitable for and τ equally _ywith C _{τ y}characteristic and technical specification, the only long limit b of strip capacitor cell in formula ₀oX direction of principal axis should be arranged at, and its minor face a ₀then in OY direction.

2, contact parallel plate capacitor design

(1) planar design of parallel plate capacitor

The original index normal direction Max.contact stress σ of setting _nmaxfor 200Kpa, if the stressed A of normal direction is square 10 × 10mm ², then maximum normal force F _zmaxfor σ _nmaxa=20N.Tangential Max.contact stress τ _maxfor 70Kp, the distribution of force face of tangential stress is 10 × 10mm ², then maximum tangential force component F _xmax=F _ymax=τ _maxa=7N.

Strip capacitor cell constructive variations shown in Fig. 4 and Fig. 5, only illustrates that electric capacity exports and tangential stress ± τ _xthe relation of input, capacitance increase is all negative, and therefore this initial capacitance structure is not suitable for as right ± τ _xobtain the response increasing and decreasing electric capacity.The present invention adjusts the initiating structure of bottom crown on strip capacitor cell for this reason, and width is a ₀and ka ₀strip capacitor cell form a pair capacitor cell to (C _lwith C _r), specifically as shown in Figure 6.

In Fig. 6, capacitor cell C _land C _relectrode size b ₀, d ₀all identical, width one is a ₀, one is ka ₀, wherein k is constant, is preferably greater than the integer of 1.Work as τ _xwhen=0, C _l=C ₀, C _r=kC ₀, on this basis as at F _xδ is produced under excitation _xmistake skew, offset effect as shown in fig. 4 or 5 will be formed.

$C_L=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;\left(a_0-{\mathrm{\&delta;}}_x\right)}{d_0}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0{\mathrm{\&tau;}}_x}{G}=C_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;F_x}{{\mathrm{Ga}}_0}---\left(13\right)$

$C_R=\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0\&CenterDot;\left({\mathrm{Ka}}_0-{\mathrm{\&delta;}}_x\right)}{d_0}={\mathrm{kC}}_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;b_0{\mathrm{\&tau;}}_x}{G}={\mathrm{kC}}_0-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r\&CenterDot;F_x}{{\mathrm{Ga}}_0}---\left(14\right)$

C _land C _rcapacitor cell is at same τ _xδ will be produced _xwith Δ C _τresponse.

Thus, formula (11) can be revised as

${\mathrm{aC}}_{\mathrm{\&tau;}x}=C_{\mathrm{\&tau;}0}-\frac{{\mathrm{\&epsiv;}}_0\&CenterDot;{\mathrm{\&epsiv;}}_r}{{\mathrm{Ga}}_0}{F}_x$

In formula, for initial capacitance when shearing stress is zero, above formula is shearing stress input-output characteristic, C _{τ x}with F _xlinear relationship, and its sensitivity

Electrode plane see Fig. 7 is arranged, at a 10 × 10mm ²substrate center do cross separate, form four quadrants, upper right first quartile I, upper left second quadrant II, lower-left third quadrant III, bottom right fourth quadrant IV, wherein I, III quadrant is to τ _xmake the capacitor cell combination of response, and II, IV quadrant is to τ _ymake the capacitor cell combination of response.Object-line is 10 × 10mm ²pcb board four edge lines, hachure part represents the outer mode cross section of wax-loss casting process.Using the position of induction electrode in lower floor's PCB substrate as reference, then the layout of drive electrode in the PCB substrate of upper strata should with PCB substrate edge line for benchmark.In figure, four dashed rectangle are the benchmark of induction electrode on bottom crown, put they and geometry datum line differential apart from being δ ₀(0.1mm).

Capacitor cell module adopts comb structure, and capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, and each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown.By formula (12) a ₀less, the sensitivity of tangential stress response is larger, therefore single capacitor cell is strip.If every root strip capacitor cell is wide is a ₀, the groove width between two strip electric capacity is a _δ, then the pitch of every root strip capacitor cell is ka ₀+ a ₀+ 2a _δ.In order to make full use of the plane space of square substrate, M (ka ₀+ a ₀+ 2a _δ) b ₀/ 2 ≈ 1 square substrate surface areas, M is strip electric capacity quantity, then have M (ka ₀+ a ₀+ 2a _δ)=20mm, in formula, groove width a _δunsuitable excessive, otherwise be unfavorable for using the effective plane space on substrate, also unsuitable too small, the constraint of wax-loss casting process is subject to.For making normal direction sensitivity S _nwith tangential sensitivity S _τequal, by formula (7) and (12), make a ₀g=d ₀e, works as d ₀when=0.1mm, k=1.5, thus M can be obtained.

In order to realize τ _xand τ _ybetween tangential response mutually do not have an impact, the drive electrode length two ends reserved difference position δ of strip capacitor cell ₀, therefore b _{0 drives}=b _{0 end}+ 2 δ ₀, wherein at b _{0 drives}two ends length reserved difference potential theory should ensure ${\mathrm{\&delta;}}_0\&GreaterEqual;d_0\&CenterDot;\frac{{\mathrm{\&tau;}}_{\max }}{G},$ 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 should b be ensured in technique _{0 drives}-b _{0 end}>=0.01mm.Like this when computing method exports response to electric capacity, ensure τ _xand τ _yany impact is not produced on the response of normal direction electric capacity.

In order to realize τ _xand τ _ydo not produce any impact to the response of normal direction electric capacity, width is a ₀and ka ₀strip capacitor cell form a pair capacitor cell to (C _lwith C _r) carry out publicity reckoning elimination impact each other.Ensure τ _xproduce τ at I, III quadrant capacitor cell _xelectric capacity response, then produce τ at II, IV quadrant capacitor cell _yelectric capacity response, to ensure that capacitor cell in four quadrants is at τ _xand τ _ytwo groups of differential capacitors pair can be produced under tangential excitation.C in the figure 7 _{τ xI}=C _rand C _{τ xIII}=C _lfor conversion τ _xdifferential capacitor pair, and C _{τ xII}=C _land C _{τ xIV}=C _rbe then conversion τ _ydifferential capacitor pair.

(2) calculating of normal stress and tangential force

If width is a in Fig. 7 ₀strip capacitor cell be subject to tangential force τ _x, produce a tangential displacement d _xafter output capacitance value be C ₁, width is ka ₀strip capacitor cell be subject to tangential force τ _x, produce a tangential displacement d _xafter output capacitance value be C ₂, then have:

$C_1=\frac{\mathrm{\&epsiv;}\left(a_0-d_x\right)b_0}{d_n}=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(15\right)$

$C_2=\frac{\mathrm{\&epsiv;}\left({\mathrm{ka}}_0-d_x\right)b_0}{d_n}=\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;b}}_0{d}_x}{d_n}---\left(16\right)$

Obtained by (15)-(16):

$C_1-C_2=\frac{{\mathrm{\&epsiv;a}}_0{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;ka}}_0{b}_0}{d_n}$ Calculate:

$d_n=\frac{{\mathrm{\&epsiv;a}}_0{b}_0\left(1-k\right)}{C_1-C_2}---\left(17\right)$

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

${\mathrm{kC}}_1-C_2=\frac{{\mathrm{\&epsiv;d}}_x{b}_0}{d_n}=\frac{{\mathrm{\&epsiv;kd}}_x{b}_0}{d_n}-\frac{{\mathrm{\&epsiv;d}}_x{b}_0\left(1-k\right)}{d_n},$ (17) are substituted into above formula, can obtain:

$d_x=\frac{a_0\left({\mathrm{kC}}_1-C_2\right)}{C_1-C_2}---\left(18\right)$

According to $d_n=d_0-\mathrm{\&Delta;}d=d_0\left(1-\frac{F_n}{E\&CenterDot;S_0}\right)$

Known: $F_n=\frac{\left(d_n-d_0\right)E\&CenterDot;S_0}{d_0}$

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, no matter be normal direction excitation F _nor tangentially encourage F _yall not to O _τhave an impact.Namely automatically σ is eliminated _nand τ _yto τ _xthe coupling of total output or interference because every in signal packet containing in the computing of subtracting each other, equivalent and the capacitance variations with symbol are eliminated all automatically.And F _yand F _xto σ _ninterference by upper electrode at b ₀direction increases geometrical length 2 δ ₀eliminate.In like manner F can be obtained _{τ y}.

(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 Fig. 9.In Fig. 9,1 is upper PCB substrate, and 2 is lower PCB substrate, and 3 is drive electrode, and 4 is induction electrode, and 5 is elastic fluid.Pole plate is apart from d ₀=0.1mm, upper and lower base plate inner space, except copper foil electrode, is PDMS (polydimethylsiloxane) the superlastic dielectric with lost wax process filling.Its machinery and physical characteristic parameter are Young's modulus E=6.2MPa, and its shear modulus is G=4.1MPa, relative DIELECTRIC CONSTANT ε during dielectric polorization _γ=2.5.Because E and G of medium is much smaller than the elastic modulus E of copper _copper=103GPa.Therefore the distortion of capacitor internal medium under stress state is much larger than the distortion of pole plate.

(5) contact conductor design

Be that drive electrode or induction electrode all need to have lead-out wire, consider that each drive electrode is all ground connection in signal level, therefore four groups of drive electrodes only need share same lead-out wire.The induction electrode of four the first strip capacitor cell groups and the second strip capacitor cell group then needs with respective independently lead-out wire, and draw from the side of planar package so whole capacitance component has at least 5 pins, four induction electrodes refer to that X-direction width is a ₀induction electrode and width be ka ₀induction electrode, and Y-direction width is a ₀induction electrode and width be ka ₀induction electrode so that whole assembly top and bottom outer surface can contact with measuring object easily.The present invention, under the support of new material and new technology, completes the design of a kind of novel three-dimensional power sensitization capacitance combination, at 10 × 10mm ²stress surface on, be no matter normal direction or tangential, all can transmit stress more uniformly to medium.In literary composition, four cell capacitance are two to combination distribution.In the contact of non-coplanar force and sensor surface, external force only has 1, and electric capacity response but has 4, and whole battery lead plate, all to asking Fn to contribute, simultaneously by two pairs of capacitor combinations composition systems, can obtain F again _xand F _yinformation, thus complete description three-dimensional force.These 4 cell capacitance combinations should complete its basic function, do not interfere with each other again, and this is just achieved by design concept cleverly.

The three-dimensional pressure sensor provided in the present invention, accuracy of detection is high, and volume is little is only 10*10mm ², thickness is thin, so the volume taking removable monitoring point is also very little, is conducive to the volume reducing monitoring point.The control unit of capacitance sensor is connected on the microprocessor of monitoring point, and the stress value monitored is sent to monitoring point, the real-time stress value of monitoring point monitoring tested point, and preserves in the microprocessor.

The work structuring block diagram of removable monitoring point as shown in Figure 10, also signal projector is provided with in removable monitoring point, the stress value that capacitance sensor monitors is sent to microprocessor, simultaneously, in order to expand the function of monitoring point, the temperature that also can increase, heart rate or pulse transducer, sensor all can be set together with capacitance sensor, and the signal that transmission monitors is to microprocessor.The outfan of microprocessor is connected with signal projector and reception antenna, the signal received is sent in the processor of wearable device through signal projector, by processor statistical monitoring point detection data and store data in data base, facilitate statistical conversion and calling.Be provided with micro power in monitoring point and carry out power supply supply, removable monitoring point overall structure is simple, power consumption is little, and micro power enough supports the supply of electrical energy work of monitoring point, conveniently power source charges, in monitoring point, be provided with reception antenna in the present invention, carry out wireless charging.The power supply of processor is provided with transmitting antenna equally, by antenna transmission electromagnetic wave, reception antenna in monitoring point receives electromagnetic wave and is converted into electric energy, although charging can ensure that the power supply moment of monitoring point remains on full scale state, but moment charging affects the service life of monitoring point, so the present invention is provided with electric quantity monitoring unit in monitoring point, when microprocessor receives electricity too low signal, can automatically open antenna transmission charging signals to processor, microprocessor and processor are opened simultaneously and are charged, after monitoring point is full of electricity, microprocessor cuts out antenna, launch the full signal of electricity to processor, processor cuts out transmitting antenna equally, avoid electromagnetic wave always in running order, affect the service life of electrical equipment.If when electric quantity of power supply deficiency in processor, processor also can carry out wireless charging by transmitting antenna, avoids the trouble of wired charging, the obstacle of circuit.

Processor in the present invention is that the little functional equivalent of moveable volume is in the device of display equally, processor can be carried with, have the function of reporting to the police and recording tested point signal, processor can be set to integrative-structure with wrist-watch or mobile phone, easy to carry so attractive in appearance again.Processor is a miniature signal receiving end, there is the function and stored signal data function that give the alarm when monitor signal exceedes the danger signal of setting threshold value, the power supply reserve of electricity of simultaneous processor is larger than the power supply reserve of electricity of microprocessor, processor as stand-by power supply for monitoring point provides electric energy to ensure.

The work structuring block diagram of processor as shown in figure 11, antenna, data base, selector switch, power supply is provided with in processor, power supply and antenna connection handling device, power supply provides energy source for processor work, simultaneously as the stand-by power supply of monitoring point, when receiving the low electric quantity signal that microprocessor sends, processor unlatching antenna sends the electromagnetic wave carrying electric energy and charges to microprocessor in microprocessor, when after microprocessor charging complete, microprocessor sends the full signal of electricity to processor, and processor cuts out electromagnetic wave signal.The monitor signal of the monitoring point that processor receives and the every signal through processor of charging signals are all preserved in a database, by installing communications protocol communication between monitoring point and processor, so the data of data base also can copy out to put carry out data analysis in a computer.The duty of selector switch controlled in wireless monitoring point, trigger element is provided with in microprocessor in monitoring point, because monitoring point has multiple, user can be selected arbitrarily several at every turn, is arbitrarily worn on tested point place, does not need each wearing, so the duty of monitoring point needs to control, when receiving start signal, just in running order, so be provided with trigger element in monitoring point.Selector switch in processor controls trigger element, monitoring point carries out labelling setting that selector switch in processor is corresponding, multiple monitoring point needs labelling respectively, use one of them in order to avoid long-time and do not know, or producer improves in monitoring in part as required at o'clock, all need in these situations to carry out labelling to monitoring point, the corresponding monitoring point of labelling in selector switch, after monitoring point is worn on tested point, user is the interior monitoring point labelling clicking use of selector switch item within a processor, processor sends triggering signal, after trigger element in monitoring point receives trigger-type signal, monitoring point is opened in running order.The setting of trigger element and selector switch is to distinguish monitoring point, records the service time of each monitoring point, controls the duty of monitoring point, avoids that monitoring point is always in running order affects service life.

Alarm unit and threshold cell is also provided with in processor, the data of threshold cell are the warning line data set in advance, once exceed threshold data, alarm unit gives the alarm signal, alarm unit is except sounding except warning, and can send remote signal on guardian's mobile phone of user, alarm unit inside is provided with mass-sending function, alarm signal can be mass-sended on several mobile phone, avoid the situation generation that a mobile phone by chance shuts down.GPS positioning unit is also provided with in processor, when processor monitors the data exceeding threshold signal, GPS locating information is included in the warning information sent, guardian is facilitated to find wearer in time, avoid just in case the generation of situation, as wearer is subject to hard hit, the emergency case such as faints suddenly.

Manual alarm button is also provided with in simultaneous processor, when the wearer of monitoring point feel uncomfortable or in the hole under, time monitoring point does not monitor out in time, wearer directly can press alarm button stealthily, guardian receives alarm signal and locating information, can arrive in the very nick of time.Once wearer's hands is by mistake or under encountering because of carelessness and being in the situation of not hindering, do not need to send alarm signal, but warning sound sounds, alarm signal sends, in order to reduce everybody worry, also can cancel the transmission of alarm signal or sending safety information to guardian.So processor is also provided with one not hinder button, when alarming sound sound equipment rises, illustrate that alarm signal sends, wearer feels that health does not hinder or just careless, there is no need to cause everybody flurried, do not hinder button so can click, resend and once do not hinder information on guardian's mobile phone, avoid tutorial worry with flurried.

Above by reference to the accompanying drawings to invention has been exemplary description; obvious specific implementation of the present invention is not subject to the restrictions described above; as long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; or design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention without to improve.The protection domain that protection scope of the present invention should limit with claims is as the criterion.

Claims (10)

1., based on the wearable health monitoring equipment that three-dimensional pressure detects, it is characterized in that, described monitoring equipment comprises:

Multiple removable monitoring point, removable monitoring point is worn on clothing and is attached to skin, the three-dimensional pressure sensor of the pressure size that microprocessor is subject to monitoring tested point is provided with in removable monitoring point, three-dimensional pressure sensor connects microprocessor, microprocessor sends wireless signal, three-dimensional pressure sensor is contact parallel-plate three-dimensional force sensor, sensor comprises control unit, the X-direction capacitor cell group be connected respectively with control unit and Y-direction capacitor cell group, described X-direction capacitor cell group and Y-direction capacitor cell group include capacitor cell module, described capacitor cell module adopts the comb teeth-shaped structure be made up of plural strip capacitor cell, each strip capacitor cell comprises the drive electrode of top crown and the induction electrode of bottom crown, described capacitor cell module comprises by two or more width a ₀length b ₀strip capacitor cell composition the first strip capacitor cell group and two or more width ka ₀length b ₀strip capacitor cell composition the second strip capacitor cell group,

Processor, the removable monitoring point of wireless connections receives the monitor signal that microprocessor sends, and be provided with alarm unit and threshold cell in processor, alarm unit and threshold value are connected to processor, monitor signal exceedes the value of threshold cell setting, and alarm unit sends alarm signal.

2. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, the drive electrode of described each strip capacitor cell is identical with induction electrode width, the length of drive electrode is greater than induction electrode length, and drive electrode length two ends are reserved 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 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, and wherein d ₀for strip capacitor cell dielectric thickness, G is the modulus of rigidity of elastic fluid, τ _maxfor maximum stress value.

3. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, the lead-in wire that described comb teeth-shaped structure comprises more than 20 strip capacitor cells, connects one to one with strip capacitor cell, is provided with electrode spacing a between adjacent two strip capacitor cells _δ, described parallel-plate area S=M (a ₀+ 2a _δ+ ka ₀) b ₀/ 2, wherein, M is strip capacitor cell quantity, b ₀for the length of strip capacitor cell, a ₀the width of strip capacitor cell.

4. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, the strip capacitor cell lead-in wire of described first strip capacitor cell group and the second strip capacitor cell group is by parallel way or be independently connected to control unit.

5. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, is characterized in that, the width of described strip capacitor cell wherein, d ₀for dielectric thickness, E is the Young's modulus of elastic fluid, and G is the modulus of rigidity of elastic fluid.

6. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, described first strip capacitor cell group and be respectively equipped with intermediate translator between the second strip capacitor cell group and control unit, intermediate translator is for arranging voltage to electric capacity or frequency to the transmission coefficient of electric capacity.

7. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, reception antenna and trigger element is also provided with in described removable monitoring point, reception antenna connects on the microprocessor, charged by reception antenna in removable monitoring point, trigger element connects microprocessor, and trigger element controls the duty of removable monitoring point.

8. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, also comprise transmitting antenna and power supply in described processor, power supply and transmitting antenna connection handling device, processor carries out wireless charging electric discharge through transmitting antenna.

9. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, also selector switch is comprised in described processor, selector switch in processor is arranged corresponding to each removable monitoring point, the duty of the removable monitoring point of selector switch controlled in wireless.

10. the wearable health monitoring equipment detected based on three-dimensional pressure according to claim 1, it is characterized in that, be provided with sound circuit and remote signal circuit in alarm unit in described processor, processor gives by the remote signal circuit group photos and sending messages of alarm unit the guardian dressing monitoring equipment.