CN106840475A - A kind of pliable pressure sensor-based system - Google Patents
A kind of pliable pressure sensor-based system Download PDFInfo
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- CN106840475A CN106840475A CN201710168080.5A CN201710168080A CN106840475A CN 106840475 A CN106840475 A CN 106840475A CN 201710168080 A CN201710168080 A CN 201710168080A CN 106840475 A CN106840475 A CN 106840475A
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- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/14—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators
- G01L1/142—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors
- G01L1/146—Measuring force or stress, in general by measuring variations in capacitance or inductance of electrical elements, e.g. by measuring variations of frequency of electrical oscillators using capacitors for measuring force distributions, e.g. using force arrays
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The present invention relates to a kind of pliable pressure sensor-based system, it is characterised in that the system includes pliable pressure sensor, signal pickup assembly and host computer；The host computer is connected by signal pickup assembly with the output end of pliable pressure sensor, signal pickup assembly is used for gathering the signal of pliable pressure sensor, host computer is processed gathering the data come, and will act on the pressure distribution state on pliable pressure sensor and be presented in the display screen of host computer, obtain pressure distribution image；The pliable pressure sensor from top to bottom includes upper cushion, upper electrode layer, dielectric layer, lower electrode layer and bottom breaker successively, and upper cushion, upper electrode layer, dielectric layer, lower electrode layer and bottom breaker are wrapped in screen layer, the screen layer uses Antiradiation protection cloth, shielding layer grounding；It is respectively equipped with M bars and N ribbon parallel poles on upper electrode layer and lower electrode layer, and parallel pole on upper electrode layer and lower electrode layer spatially intersects vertically.
Description
Technical field
The present invention relates to technical field of pressure detection, more particularly to a kind of pliable pressure sensor-based system can be used for medical health
The detection of pressure distribution state during multiple.
Background technology
With continuing to develop for, microelectric technique and new material development, the measurement of the pressure size contacted between object with point
Analysis plays an important role in the research and development of many industries, electronic skin that it may be directly applied to robot,
The fields such as intelligent bionic, biologic medical detection, intelligent robot.
Traditional resistive pressure sensor has the shortcomings that stiff, not flexible, is not suitable for being applied to flexible occasion
Measurement；Although and the capacitance pressure transducer, for quickly growing in recent years solves flexible problem to a certain extent but it is measured
In the range of do not obtain resolution ratio higher, it is impossible to the situation of very clear accurately reflection object being measured；Such as patent
A kind of sleep-respiratory detection means based on flexible force sensitive sensor disclosed in CN105997088A, the device includes that flexible force is quick
Array mattress, although the mattress can stablize measure pressure distribution image, due to thereon, between lower electrode layer electrode
Away from excessive, the array density of capacitor cell is low, and the resolution ratio of its measurement is not high enough, when electrode width and adjacent spacing is reduced, then
Diminishing for capacitor cell can be caused, then sensor unit easily by various electric noises interference such as by electric wire, circuit board and
The interference that sensor brings in itself, and lead to not obtain high-resolution sensor.
Therefore provide it is a kind of with flexibility, high-resolution, high stability pliable pressure sensor-based system, as existing skill
Problem demanding prompt solution in art.
The content of the invention
In view of the shortcomings of the prior art, the technical problem that the present invention is intended to solve is to provide a kind of pliable pressure sensor-based system.
The system can realize the high density arrays of capacitor cell, and then obtain using the principle of array capacitor while ensureing flexible
Resolution ratio higher.
The present invention solves the technical scheme that the technical problem uses：A kind of pliable pressure sensor-based system is provided, it is special
Levy is that the system includes pliable pressure sensor, signal pickup assembly and host computer；The host computer is filled by signal acquisition
Put and be connected with the output end of pliable pressure sensor, signal pickup assembly is used for gathering the signal of pliable pressure sensor, upper
Machine is processed gathering the data come, and the pressure distribution state that will act on pliable pressure sensor is presented on host computer
In display screen, pressure distribution image is obtained；
The pliable pressure sensor from top to bottom successively include upper cushion, upper electrode layer, dielectric layer, lower electrode layer and
Bottom breaker, and upper cushion, upper electrode layer, dielectric layer, lower electrode layer and bottom breaker be wrapped in screen layer, the screen
Cover layer and use Antiradiation protection cloth, shielding layer grounding；M bars and N ribbon parallel poles are respectively equipped with upper electrode layer and lower electrode layer,
And the parallel pole on upper electrode layer and lower electrode layer spatially intersects vertically；So each upper electrode layer and lower electrode layer
The part that parallel pole intersects then constitutes a capacitor cell, i.e., the pliable pressure sensor is by M × N number of capacitor cell battle array
Row are formed, and each capacitor cell is a small sensor unit；Electrode material on upper electrode layer and lower electrode layer is
Conductive fabric；Dielectric layer is macromolecule polyester class A foam A；
The signal pickup assembly includes alternating message source, switch scanning device and data acquisition module, alternating message source
It is sine signal source；The switch scanning device is the input of a variable connector, alternating message source and switch scanning device
Connection, the M roads output end of switch scanning device is connected with the M strip electrodes of upper electrode layer；
Data acquisition module includes data collecting card and N roads sampling resistor, and pliable pressure is connected respectively per road sampling resistor
N bar parallel poles on the lower electrode layer of sensor, N roads sampling resistor simultaneous connection is connected according to capture card, is adopted using data
Voltage of the truck collection per road sampling resistor；Simultaneous data-collecting card is connected with alternating message source, for alternating message source provides letter
Number.
Compared with prior art, the beneficial effects of the invention are as follows：
1) the pressure-plotting high resolution for measuring.The pliable pressure sensor has used the electrode of smaller width so that
Each sensor unit is smaller, improves the distribution density of sensor unit, and under equal area, the capacitor cell of its array is
Before similar 3 times, so as to obtain resolution ratio higher.
2) sensitivity is higher.When the present invention uses compliant conductive cloth as electrode material, electrode resistance is smaller, and this is caused often
One capacitor cell is sensitiveer, can measure less pressure, and certainty of measurement is mentioned；What on the other hand the present invention was used is parallel
Electrode width diminishes, then the relative area of each electric capacity diminishes, and initial capacitance diminishes so that the pliable pressure sensor is more
It is sensitive.
3) it is flexible more preferable.Compared with the conducting channel for being printed onto flexible material in the prior art, pliable pressure of the present invention is passed
The conductive material (abbreviation conductive fabric) of a kind of similar cotton that sensor electrode is used, it is more soft when being contacted with detected person, relax
Clothes, are more easy to detected person's receiving.
Brief description of the drawings
Fig. 1 is a kind of overall structure diagram of embodiment of pliable pressure sensor-based system of the present invention；
Fig. 2 is the structural representation of heretofore described pliable pressure sensor；
Fig. 3 is the cross section structure diagram of heretofore described pliable pressure sensor；
Fig. 4 is the principle schematic of the signal acquisition of pliable pressure sensor-based system of the present invention；
Fig. 5 is a kind of structured flowchart of embodiment signal pickup assembly of pliable pressure sensor-based system of the present invention；
In figure, 1, detected person, 2, mattress, 3, pliable pressure sensor, 4, signal pickup assembly, 5, host computer；31st, on
Cushion, 32, upper electrode layer, 33, dielectric layer, 34, lower electrode layer, 35, bottom breaker, 36, screen layer；41st, alternating message source,
42nd, switch scanning device, 43, data acquisition module.
Specific embodiment
In order that the present invention realizes above-mentioned function, following examples are flexible by the one kind provided the present invention with reference to accompanying drawing
Pressure capsule system is made and being specifically described.
Pliable pressure sensor-based system (abbreviation system, referring to Fig. 1-5) of the present invention is adopted including pliable pressure sensor 3, signal
Acquisition means 4 and host computer 5；The host computer 5 is connected by signal pickup assembly 4 with the output end of pliable pressure sensor 3, letter
Number harvester is used for gathering the signal of pliable pressure sensor 3, and host computer is processed gathering the data come, and will effect
In the display screen that the pressure distribution state on pliable pressure sensor 3 is presented on host computer, pressure distribution image is obtained；
The pliable pressure sensor 3 from top to bottom successively include upper cushion 31, upper electrode layer 32, dielectric layer 33, under
Electrode layer 34 and bottom breaker 35, and upper cushion 31, upper electrode layer 32, dielectric layer 33, lower electrode layer 34 and bottom breaker 35
It is wrapped in screen layer 36, the screen layer 36 is grounded using soft Antiradiation protection cloth, screen layer 36；Upper electrode layer 32 is with
It is respectively equipped with M bars and N ribbon parallel poles on electrode layer 34, and parallel pole on upper electrode layer 32 and lower electrode layer 34 exists
Spatially intersect vertically；The part that so parallel pole of each upper electrode layer 32 and lower electrode layer 34 intersects then constitutes one
Capacitor cell, i.e. the pliable pressure sensor are formed by M × N number of capacitor cell array, and each capacitor cell is one
Small sensor unit；Electrode material on upper electrode layer and lower electrode layer is a kind of compliant conductive cloth, with good conduction
Property and flexibility, compared with the conductive rubber being printed on before on electrode layer, the compliant conductive cloth not only it is flexible more preferably, people's contact
When feel more comfortable, and its material resistance is small in itself, per resistance only 2~3 Europe of ribbon parallel pole so that each
Sensor unit is sensitiveer, and precision is higher；Dielectric layer 33 is macromolecule polyester class A foam A, is similar to the material of sponge etc, a side
This made of soft in face so that pliable pressure sensor 3 has good flexibility, pliable pressure sensing is covered with when detected person lies in
When on the care bed of device 3, can feel comfortable；On the other hand, the material has suitable elastic modelling quantity, it is ensured that experienced at it
After certain pressure, compressed；Meanwhile, after distress resolves, can very well return to original state.
The signal pickup assembly includes alternating message source 41, switch scanning device 42 and data acquisition module 43, exchange
Signal source 41 is a sine signal source of amplitude 5V frequencies 1000Hz；The switch scanning device 42 is a variable connector,
Model NI PXI/PXIe-2527, alternating message source 41 is connected with the input of switch scanning device 42, switch scanning device
42 M roads output end is connected with the M strip electrodes of upper electrode layer, configures switch scanning device, opens the inside of switch scanning device
Pass constantly switches from 1 road to M roads, so that the parallel pole of the upper electrode layer of pliable pressure sensor is from the 1st article to the M articles
Signal source periodically is received, so as to form periodic scan；
Data acquisition module 43 includes data collecting card and N roads sampling resistor, and flexible pressure is connected respectively per road sampling resistor
N bar parallel poles on the lower electrode layer 34 of force snesor 3；Data collecting card gathers the voltage of sampling resistor, by data acquisition
N number of simulation input serial ports on card is realized；N strip electrodes difference that will be on the lower electrode layer 35 of pliable pressure sensor 3
External sampling resistor, N roads sampling resistor simultaneous connection is connected according to capture card, and the collection of Usage data collection card is per road sampling resistor
Voltage；Simultaneous data-collecting card is connected with alternating message source 41, for alternating message source provides signal.
With the periodic scan of switch scanning device 42, data collecting card can constantly read every a line capacitor cell
Pressure signal, when switch scanning device is scanned to N roads from 1 road, completes the scanning of a cycle, obtains all the sensors unit
By the voltage value of sampling resistor corresponding under ambient pressure.The incoming host computer 5 of data that will be collected again, sweeps to this
The data that the cycle of retouching is collected are processed.When extraneous no pressure, then one group of initial value can be collected, with initial value as base
Standard, the data under the different pressures that will be collected, in host computer by low pass filter filtering, amplify, then carry out direct current put down
The treatment such as equal algorithm, i.e., calculate root mean square to the data after amplification, extracts the D. C. value in AC signal；Then interception 50 every time
Individual value, takes its average value, with 0.05v is a gradient by direct current signal to obtain the direct current signal of stabilization, and data are often differed
After 0.05, just change a kind of color, be filled into pressure-plotting, finally show different conditions in the display screen of host computer
Pressure distribution image.
Further characteristic of the invention is the model NI PXI-6251 of the data collecting card, switch scanning device
It is the variable connector boards of NI-PXI/PXIe 2527.
Embodiment illustrated in fig. 1 shows that pliable pressure sensor-based system of the present invention includes pliable pressure sensor 3, signal acquisition
Device 4 and host computer 5, pliable pressure sensor 3 are connected with signal pickup assembly 4, and signal pickup assembly carries out double with host computer
To communication, it is placed on signal pliable pressure sensor 3 is smooth on mattress 2 when using, it is when detected person lies down, then flexible
Pressure sensor 3 experiences pressure, detected person is converted into electric signal to the pressure signal of pliable pressure sensor, by data
Harvester is gathered in the electric signal, and incoming host computer 5, and data processing is carried out in host computer 5, finally in host computer 5
The image of output pressure distribution in display screen.
Embodiment illustrated in fig. 2 shows that the structure of the pliable pressure sensor of pliable pressure sensor-based system of the present invention is：Including
Upper electrode layer 32, lower electrode layer 34 and dielectric layer 33, dielectric layer are located between upper electrode layer and lower electrode layer, additionally including upper
Cushion 31, bottom breaker 35 and screen layer 36 (referring to Fig. 3).The upper cushion and bottom breaker use flexible material system
Into respectively positioned at upper electrode layer and the upper and lower part of lower electrode layer, upper electrode layer and lower electrode layer are provided with the parallel electricity of banding
Pole, the parallel pole is made up of a kind of compliant conductive cloth, the M bars parallel pole of upper electrode layer electricity parallel with the N bars of lower electrode layer
Pole spatial vertical intersects, and the parallel pole of the upper and lower electrode layer is respectively by the loop phase in wire and signal pickup assembly
Connection；Upper electrode layer 32, dielectric layer 33, lower electrode layer 34, upper cushion 31, bottom breaker 35 are wrapped in screen layer 36.
Embodiment illustrated in fig. 5 shows that the signal pickup assembly 4 of pliable pressure sensor-based system of the present invention includes alternating message source
41st, switch scanning device 42 and data acquisition module 43, data acquisition module 43 include N roads sampling resistor and data collecting card,
Data collecting card is connected with sampling resistor, gathers sampling resistor voltage, and pliable pressure sensor 3 is connected respectively per road sampling resistor
Lower electrode layer 34 on N bar parallel poles；Simultaneous data-collecting card provides signal for alternating message source, alternating message source with open
The input for closing scanning means is connected, the M root parallel poles on the upper electrode layer of switch scanning device and pliable pressure sensor 3
Connection is (referring to Fig. 4).
The implementation method of specific pliable pressure sensor Fig. 4 (be as shown in Fig. 4 by M, N=3 in the case of signal
Figure) shown in：Alternating message source 41 exports a sinusoidal signal of 5V, 1000Hz；Then switch scanning device 42 is accessed；By amplitude
The sine signal source of 5V frequencies 1000Hz accesses the switch scanning device on the tunnel of 1 line 32, by switch scanning device, picks out M
Individual signal, is then connected with the M root electrodes on the upper electrode layer 32 of pliable pressure sensor 3, when switch scanning device is swept from 1 tunnel
When retouching M roads, that is, the scanning of a cycle is completed, then the M bars parallel pole that sine signal source can be successively with upper electrode layer is connected,
Disconnected after being kept for the of short duration time；Every parallel pole on lower electrode layer 34 is connected into a sampling resistor, is then grounded, this is just
Form a complete closed-loop path.Voltage of the data collecting card collection per road sampling resistor two ends, i.e., when alternating message source connects
When leading to certain a line parallel pole, then the signal of all the sensors unit of the row, switch scanning device can be simultaneously collected
Periodic scan is carried out, then ensures that signal source is periodically sequentially ingressed into 1 road to M roads circuit, i.e., can periodically collected complete
The signal of portion's sensor unit.
The operation principle and process of pliable pressure sensor-based system of the present invention：
Operation principle：Pliable pressure sensor 3 is by upper cushion 31, upper electrode layer 32, dielectric layer 33, lower electrode layer
34th, bottom breaker 35 and screen layer 36 are constituted；It is respectively M bars and N ribbon parallel poles on upper and lower electrode layer, and it is upper and lower
The parallel pole of electrode layer spatially intersects vertically；The part that so each upper and lower layer intersects then constitutes an electric capacity list
Unit, i.e. the pliable pressure sensor are formed by M × N number of capacitor cell array.The computing formula of electric capacity is：Its
Middle ε0It is the dielectric constant of vacuum；ε is the relative dielectric constant with vacuum of dielectric layer；S is the area of each capacitor cell, i.e. phase
The area of mutual vertical electrode crossing；D is the distance between two parallel poles, the i.e. thickness of dielectric layer.So, when the external world applies
During plus-pressure, s is certain, changes apart from d, causes electric capacity C to change.
The course of work：Alternating message source is exported by a simulation output port on data collecting card, switch scanning device
Then realized by the variable connector boards of NI-PXI/PXIe 2527, by the line of simulation output port and the common port of variable connector board
(COM ends) is connected, and the M roads output end of variable connector is connected with the M bar parallel poles of upper electrode layer, by the N bars of lower electrode layer
The external sampling resistor R0 of parallel pole, is then grounded, and forms closed-loop path；By N number of simulation input port of data collecting card point
Sampling resistor two ends are not connected to gather sampling resistor both end voltage.When switch scanning device, to be switched to M roads from the first via complete
Into a cycle scanning when, then data acquisition device will collect whole signals of M × N number of sensor, preserve, it is incoming upper
After the treatment such as machine, host computer is filtered to time-domain signal, denoising, amplification, the output pressure distributed image in host computer.
Embodiment 1
The present embodiment pliable pressure sensor-based system includes pliable pressure sensor, signal pickup assembly and host computer；It is described
Host computer is connected by signal pickup assembly with the output end of pliable pressure sensor, and signal pickup assembly is used for gathering flexible pressure
The signal of force snesor, host computer is processed gathering the data come, and will act on the pressure on pliable pressure sensor
Distribution is presented in the display screen of host computer, obtains pressure distribution image；
The pliable pressure sensor from top to bottom successively include upper cushion, upper electrode layer, dielectric layer, lower electrode layer and
Bottom breaker, and upper cushion, upper electrode layer, dielectric layer, lower electrode layer and bottom breaker be wrapped in screen layer, the screen
Layer is covered using soft Antiradiation protection cloth, shielding layer grounding；M bars are respectively equipped with upper electrode layer and lower electrode layer and N ribbons are flat
Row electrode, and parallel pole on upper electrode layer and lower electrode layer spatially intersects vertically；So each upper electrode layer is with
The part that the parallel pole of electrode layer intersects then constitutes a capacitor cell, i.e., the pliable pressure sensor is by M × N number of electricity
Hold cell array to form, each capacitor cell is a small sensor unit；Electricity on upper electrode layer and lower electrode layer
Pole material is compliant conductive cloth；Dielectric layer is macromolecule polyester class A foam A；
The signal pickup assembly includes alternating message source, switch scanning device and data acquisition module, alternating message source
It is sine signal source；The switch scanning device is the input of a variable connector, alternating message source and switch scanning device
Connection, the M roads output end of switch scanning device is connected with the M strip electrodes of upper electrode layer；
Data acquisition module includes data collecting card and N roads sampling resistor, and pliable pressure is connected respectively per road sampling resistor
N bar parallel poles on the lower electrode layer of sensor, N roads sampling resistor simultaneous connection is connected according to capture card, is adopted using data
Voltage of the truck collection per road sampling resistor；Simultaneous data-collecting card is connected with alternating message source, for alternating message source provides letter
Number.
Every width of parallel pole is 9mm in the present embodiment；Spacing between adjacent two parallel poles is 7mm, often
Can 39 sensor units of array in square decimeter.
The width of every strip electrode of the same type of sensor for being carried in (CN105997088A) compared to existing technology and and electricity
Die opening is 14mm, and the area shared by each sensor unit is 14 × 14mm2, only can 13 biographies of array in every square decimeter
Sensor cell, i.e., the pliable pressure sensor described in the present embodiment is caused often by reducing electrode width and spacing in structure
Square metre sensor unit number can reach before 3 times of same type of sensor unit number, i.e. the unit intensity of sensor unit is carried
3 times before being upgraded to.And if according to prior art only by reducing electrode width and adjacent spacing, then causing sensor unit
Initial capacitance value diminish, i.e., electric capacity easily be subject to it is various interference such as by between electric wire, circuit board and sensor unit in itself band
The cross jamming for coming, and lead to not obtain high accuracy.The present invention additional screen layer in the structure of pliable pressure sensor
36, the antijamming capability of sensor unit is effectively reduced, while whole pliable pressure is sensed using soft Antiradiation protection cloth
Device is closed, and grounding can shield interference signal, moreover it is possible to ensure the flexibility of whole pliable pressure sensor.
The present invention does not address part and is applied to prior art.
Claims (3)
1. a kind of pliable pressure sensor-based system, it is characterised in that the system include pliable pressure sensor, signal pickup assembly and
Host computer；The host computer is connected by signal pickup assembly with the output end of pliable pressure sensor, and signal pickup assembly is used
To gather the signal of pliable pressure sensor, host computer is processed gathering the data come, and will act on pliable pressure sensing
Pressure distribution state on device is presented in the display screen of host computer, obtains pressure distribution image；
The pliable pressure sensor from top to bottom includes upper cushion, upper electrode layer, dielectric layer, lower electrode layer and lower slow successively
Layer is rushed, and upper cushion, upper electrode layer, dielectric layer, lower electrode layer and bottom breaker are wrapped in screen layer, the screen layer
Using Antiradiation protection cloth, shielding layer grounding；It is respectively equipped with M bars and N ribbon parallel poles on upper electrode layer and lower electrode layer, and on
Parallel pole on electrode layer and lower electrode layer spatially intersects vertically；So each upper electrode layer is parallel with lower electrode layer
The part of electrode crossing then constitutes a capacitor cell, i.e., the pliable pressure sensor is by M × N number of capacitor cell array
Into each capacitor cell is a sensor unit；Electrode material on upper electrode layer and lower electrode layer is conductive fabric；It is situated between
Electric layer is macromolecule polyester class A foam A；
The signal pickup assembly includes alternating message source, switch scanning device and data acquisition module, and alternating message source is for just
String signal source；The switch scanning device is a variable connector, and alternating message source is connected with the input of switch scanning device,
The M roads output end of switch scanning device is connected with the M strip electrodes of upper electrode layer；
Data acquisition module includes data collecting card and N roads sampling resistor, connects pliable pressure sensing respectively per road sampling resistor
N bar parallel poles on the lower electrode layer of device, N roads sampling resistor simultaneous connection is connected according to capture card, Usage data collection card
Voltage of the collection per road sampling resistor；Simultaneous data-collecting card is connected with alternating message source, for alternating message source provides signal.
2. pliable pressure sensor-based system according to claim 1, it is characterised in that the model NI of the data collecting card
PXI-6251, switch scanning device is the variable connector boards of NI-PXI/PXIe 2527.
3. pliable pressure sensor-based system according to claim 1, it is characterised in that every width of parallel pole is 9mm；
Spacing between adjacent two parallel poles is 7mm.
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| CN108731853A (en) * | 2018-03-16 | 2018-11-02 | 东南大学 | Pressure distribution measurement analysis system based on flexible material and method |
| CN109000829A (en) * | 2018-10-09 | 2018-12-14 | 江南大学 | A kind of capacitive pressure distribution monitoring material and method |
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| CN110160439A (en) * | 2019-07-02 | 2019-08-23 | 清华大学 | Contact flexible sensor |
| CN110160439B (en) * | 2019-07-02 | 2020-02-14 | 清华大学 | Contact type flexible sensor |
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| CN114486005A (en) * | 2022-01-20 | 2022-05-13 | 厦门大学 | Sensitivity prediction method and application of microstructure capacitive flexible pressure sensor |
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