CN110200636A - Plantar pressure sensor and its detection pressure, humidity and the method for collecting energy - Google Patents
Plantar pressure sensor and its detection pressure, humidity and the method for collecting energy Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 51
- 239000000463 material Substances 0.000 claims abstract description 23
- 239000010409 thin film Substances 0.000 claims abstract description 20
- 238000012545 processing Methods 0.000 claims description 51
- 238000004891 communication Methods 0.000 claims description 18
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000008859 change Effects 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 238000004088 simulation Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 7
- 238000004422 calculation algorithm Methods 0.000 claims description 6
- 238000012937 correction Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000000354 decomposition reaction Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 238000011156 evaluation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000003745 diagnosis Methods 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000005021 gait Effects 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 210000000056 organ Anatomy 0.000 description 2
- 230000002980 postoperative effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 210000003141 lower extremity Anatomy 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000001575 pathological effect Effects 0.000 description 1
- 230000035479 physiological effects, processes and functions Effects 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/1036—Measuring load distribution, e.g. podologic studies
- A61B5/1038—Measuring plantar pressure during gait
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/68—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient
- A61B5/6801—Arrangements of detecting, measuring or recording means, e.g. sensors, in relation to patient specially adapted to be attached to or worn on the body surface
- A61B5/6802—Sensor mounted on worn items
- A61B5/6804—Garments; Clothes
- A61B5/6807—Footwear
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/02—Details of sensors specially adapted for in-vivo measurements
- A61B2562/029—Humidity sensors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/06—Arrangements of multiple sensors of different types
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B2562/00—Details of sensors; Constructional details of sensor housings or probes; Accessories for sensors
- A61B2562/18—Shielding or protection of sensors from environmental influences, e.g. protection from mechanical damage
Abstract
The invention discloses a kind of plantar pressure sensors, including signal acquisition part and circuit part, signal acquisition part point includes at least one detection unit, detection unit includes humidity sensitive material layer, piezoelectric thin film layer and the first electrode layer set gradually from top to bottom, and the spaced second electrode of tool and third electrode are provided between humidity sensitive material layer and piezoelectric thin film layer；Circuit part includes front-end circuit, back-end circuit and power module, and second electrode is connected as collection of energy group, with the input terminal of power module.The invention also discloses a kind of detection pressure realized using above-mentioned plantar pressure sensor, humidity and the methods for collecting energy.The present invention can measure pressure and humidity simultaneously, moreover it is possible to collect energy as circuit part power supply, substantially increase the accuracy of sensor, compensate for the defect of existing product.The present invention is suitable for technical field of medical equipment.
Description
Technical field
The invention belongs to technical field of medical equipment, detects the pressure in vola, humidity and be modified, specifically one
Kind plantar pressure sensor and its method for detecting pressure, humidity and collection energy.
Background technique
With the improvement of living standards, human health becomes major issue concerned by people.According to biological hologram theory, foot
The vital organs of the human body and each organ of human body are associated with, and have its corresponding echo area, it can be seen that, foot and human health are long-lived
There is close relationships.
The distribution situation of Human Sole pressure can reflect the function of lower limb and the variation of body posture.Each point pressure in vola is joined
Number is tested and is analyzed, and physiology and pathological parameters of the available human body under different motion state, this is to clinical disease
The researchs such as sick diagnosis, postoperative effect evaluation, rehabilitation scale evaluation have important meaning.
Traditional plantar pressure sensor is influenced by ambient humidity mostly.When contacting and leaving sensor, foot with
Capacitor is formed between the electrode of sensor, the dielectric constant of the capacitor is changed greatly with air humidity, if without compensating approach,
Biggish error can be brought to measurement.
Summary of the invention
The object of the present invention is to provide a kind of plantar pressure sensor, the pressure and humidity that can not only detect vola can also
Collect energy.
Another object of the present invention is to provide a kind of detection pressure, wet realized using above-mentioned plantar pressure sensor
Degree and the method for collecting energy.
To achieve the above object, used technical solution is as follows by the present invention:
A kind of plantar pressure sensor, including signal acquisition part and circuit part, wherein
One) signal acquisition part
The signal acquisition part point includes at least one detection unit, the detection unit include set gradually from top to bottom it is wet
Sensitive material, piezoelectric thin film layer and first electrode layer are spent, is provided between the humidity sensitive material layer and piezoelectric thin film layer
Have spaced second electrode and third electrode；
The third electrode, piezoelectric thin film layer and first electrode decomposition pressure detection group together；The second electrode and third electricity
Pole forms capacitor by edge effect, and the humidity sensitive material between second electrode and third electrode is as dielectric layer, San Zheyi
Play composition Humidity Detection group；
Two) circuit part
The circuit part includes front-end circuit and back-end circuit；
The front-end circuit includes controller and multiplexer, and the signal output end of the controller passes through multiplexer point
It is not connected with the signal input part of second electrode and third electrode；
The back-end circuit is the first back-end circuit or the second back-end circuit；
A. the first back-end circuit
First back-end circuit includes the first demultiplexer, the first AD conversion unit, the first centre being sequentially connected in series
Manage device, communication apparatus and host computer；
The signal output end of the pressure detecting group and Humidity Detection group is connected with the signal input part of the first demultiplexer；
B. the second back-end circuit
Second back-end circuit includes the second demultiplexer being sequentially connected in series, filter unit, the second AD conversion unit,
Two central processing units, the second communication apparatus and the second host computer；
The filter unit includes in parallel low-pass filter and bandpass filter, and the second analog-to-digital conversion unit includes in parallel the
The signal output of one analog-digital converter and the second analog-digital converter, the low-pass filter is defeated with the signal of the first analog-digital converter
Enter end to be connected, the signal output end of bandpass filter is connected with the signal input part of the second analog-digital converter；Pressure detecting group and
The signal output end of Humidity Detection group is connected with the signal input part of the second demultiplexer.
The circuit part further includes power module, and second electrode is as collection of energy group, defeated with the power module
Enter end to be connected, the output end of the power module and the power input of front-end circuit and back-end circuit except the first host computer/
The power input of component except second host computer is connected.
As restriction: the cross section of the second electrode and third electrode is pectinate texture, and the branch of the two intersects
Form the capacitor that pectination is intersected.
A method of detection pressure, humidity and collection energy are realized, this method using above-mentioned plantar pressure sensor
For method one or method two, when back-end circuit uses the first back-end circuit, this method is method one, when back-end circuit uses
This method is method two when the second back-end circuit, wherein
I, method one
Method one includes the following steps successively carried out:
One, it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
AC voltage/current signal modulation after export to second electrode and third electrode；
When the humidity of second electrode and the corresponding sensor appearance of third electrode changes, the dielectric of humidity sensitive material layer
Constant changes, and Inductance and Capacitance is generated between second electrode and third electrode, and Humidity Detection group will contain the Inductance and Capacitance
The AC analogue electric signal of information is exported to the first demultiplexer；When detection unit pressure changes, piezoelectricity is thin
Film surface generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to the first AD conversion unit；
Two, the hybrid analog-digital simulation electric signal received is converted digital signal by the first AD conversion unit, and exports to the first center
Processor；
Three, the bandpass filtering algorithm that the first central processing unit is stored using itself obtains the Digital Signal Processing received comprising mutual
Feel the digital signal of capacitance information, the digital signal that the low-pass filtering algorithm that the first central processing unit is stored using itself will receive
Processing obtains the digital signal comprising pressure information；
Four, the digital signal calculation processing comprising Inductance and Capacitance information is obtained Inductance and Capacitance and changes over time by the first central processing
ValueAnd exported by the first communication apparatus to the first host computer, the first central processing is by the digital signal comprising pressure information
Calculation processing obtains pressure signalAnd it is exported by the first communication apparatus to the first host computer；
Five, the first host computer changes over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
One host computer is according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value；
II, method two
Method two includes the following steps successively carried out:
(1) it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
AC voltage/current signal modulation after export to second electrode and third electrode；
When the humidity of second electrode and the corresponding sensor appearance of third electrode changes, the dielectric of humidity sensitive material layer
Constant changes, and Inductance and Capacitance is generated between second electrode and third electrode, and Humidity Detection group will contain the Inductance and Capacitance
The AC analogue electric signal of information is exported to the second demultiplexer；When detection unit pressure changes, piezoelectricity is thin
Film surface generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to filter unit；
(2) filter unit obtains the hybrid analog-digital simulation electric signal received containing pressure change by the processing of low-pass filter
AC analogue electric signal is simultaneously exported to the first analog-digital converter, and the hybrid analog-digital simulation current signal received is passed through band logical by filter unit
The processing of filter obtains the AC analogue electric signal of the information containing Inductance and Capacitance and exports to the second analog-digital converter；
The AC analogue electric signal containing pressure change received is converted digital signal and defeated by (three) first analog-digital converters
Out to the second central processing unit, the second analog-digital converter converts the AC analogue electric signal of the information containing Inductance and Capacitance received to
Digital signal is simultaneously exported to the second central processing unit；
The digital electric signal received from the first analog-digital converter progress calculation processing is obtained pressure by (four) second central processing units
SignalAnd exported by the second communication apparatus to the second host computer, the second central processing unit will be from the second analog-digital converter
The digital signal progress calculation processing received obtains Inductance and Capacitance and changes over time valueAnd it is exported by the second communication apparatus
To the second host computer；
(5) second host computers change over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
Two host computers are according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value；
During the entire process of the method one and method two carry out, also follow the steps below respectively,
The charge-trapping that power module generates second electrode, and front-end circuit and the first back-end circuit/second back-end circuit
Power supply by multiplexer by timing control, makes to collect energy and capacitance measurement carries out in turn in the process.
Due to the adoption of the above technical solution, compared with prior art, acquired technological progress is the present invention:
(1) present invention can measure pressure and humidity simultaneously, thus the change of foot and interelectrode capacitance caused by changing to humidity
Change is modified, and substantially increases the accuracy of sensor, compensates for the defect of existing product；
(2) second electrode of the invention and third electrode form the capacitor that pectination is intersected and greatly increase capacitor for measuring humidity
Value improves accuracy；
(3) present invention uses passive piezoelectric membrane, and utilizes its positive piezoelectric property, receives to the electric energy that mechanical energy is converted to
Collection, is powered for back-end circuit, has the advantages that low energy consumption；
(4) structure of the invention is simple, ingenious, is imitated using timing control, the characteristic of piezoelectric film material and interelectrode edge
It answers, realizes multiple functions in a detection unit, while realizing collection of energy and the measurement to pressure, humidity；
(5) the invention also discloses utilize above-mentioned piezoelectric transducer detection pressure, humidity and the method for carrying out collection of energy, the party
Method step is succinct, it is easy to accomplish, have in plantar pressure detection field pioneering；
(6) present invention can be fabricated to shoe-pad sensor array, the variation of power at the multiple spot of vola be detected, to detect subject
The variation of entire plantar nervous arch when walking, it is equal to researchs such as clinical disease diagnosis, postoperative effect evaluation, rehabilitation scale evaluations
There is important meaning.
The present invention is suitable for technical field of medical equipment.
Detailed description of the invention
Attached drawing is used to provide further understanding of the present invention, and constitutes part of specification, with reality of the invention
It applies example to be used to explain the present invention together, not be construed as limiting the invention.
In the accompanying drawings:
Fig. 1 is the overall structure diagram of the embodiment of the present invention 1；
Fig. 2 is the cross-sectional view of the Humidity Detection group of the embodiment of the present invention 1；
Fig. 3 is the functional block diagram of the embodiment of the present invention 1；
Fig. 4 is schematic diagram of the embodiment of the present invention 1 using the back-end circuit of second of structure；
Fig. 5 is the embodiment of the present invention 2, and the corresponding insole area of a small electrode measures the signal of direct stress in one section of gait processes
Figure.
In figure: 1, humidity sensitive material layer, 2, second electrode and third electrode layer, 21, second electrode, 22, third electricity
Pole, 3, piezoelectric thin film layer, 4, first electrode layer.
Specific embodiment
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.It should be appreciated that preferred reality described herein
Apply example only for the purpose of illustrating and explaining the present invention and is not intended to limit the present invention.
A kind of plantar pressure insole of embodiment 1
The present embodiment is related to a kind of plantar pressure insole comprising signal acquisition part and circuit part.As depicted in figs. 1 and 2,
Signal acquisition part point includes at least one detection unit, and detection unit includes the humidity sensitive material layer set gradually from top to bottom
1, second electrode and third electrode layer 2, piezoelectric thin film layer 3 and first electrode layer 4, second electrode and third electrode layer 2 are provided with
Multiple spaced electrode groups according to vola distribution of shapes of tool, each electrode group include that cross section is the second electricity of pectinate texture
The branch of pole 21 and third electrode 22, second electrode 21 and third electrode 22 intersects to form the capacitor of pectination intersection；Third
Electrode 22, piezoelectric thin film layer 3 and first electrode decomposition pressure detection group together；Second electrode 21 and third electrode 22 pass through edge
Effect forms capacitor, and as dielectric layer, three forms the humidity sensitive material between second electrode 21 and third electrode 22 together
Humidity Detection group, second electrode 21 are used as collection of energy group.
As shown in figure 3, circuit part includes front-end circuit, back-end circuit and power module；Front-end circuit includes controller
And multiplexer, the signal output end of the controller pass through the multiplexer letter with second electrode and third electrode respectively
Number input terminal is connected；Back-end circuit includes the first demultiplexer, the first AD conversion unit, the first centre being sequentially connected in series
Manage device, the first communication apparatus and the first host computer；The signal output end of pressure detecting group and Humidity Detection group with the first multichannel
The signal input part of demodulator is connected, and the output end of collection of energy group is connected with the input terminal of power module, power module it is defeated
The power input of component of the outlet with the power input of front-end circuit and back-end circuit in addition to the first host computer is connected.
The back-end circuit of the present embodiment can also use structure as shown in Figure 4, it includes the second multichannel being sequentially connected in series
Demodulator, filter unit, the second AD conversion unit, the second central processing unit, the second communication apparatus and the second host computer；Filtering
Unit includes low-pass filter and bandpass filter in parallel, and the second analog-to-digital conversion unit includes the first analog-digital converter in parallel
Signal output with the second analog-digital converter, low-pass filter is connected with the signal input part of the first analog-digital converter, band logical filter
The signal output end of wave device is connected with the signal input part of the second analog-digital converter；The signal of pressure detecting group and Humidity Detection group
Output end is connected with the signal input part of the second demultiplexer.
A kind of detection pressure of embodiment 2, humidity and the method for collecting energy
The present embodiment is realized using embodiment 1, and when using back-end circuit shown in Fig. 3, this method is method one, it includes
The following steps successively carried out:
One, it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
AC voltage/current signal modulation after export to second electrode 21 and third electrode 22；
When the humidity of second electrode 21 and the corresponding sensor appearance of third electrode 22 changes, humidity sensitive material layer 1
Dielectric constant change, Inductance and Capacitance is generated between second electrode 21 and third electrode 22, Humidity Detection group will contain
The AC analogue electric signal for stating Inductance and Capacitance information is exported to the first demultiplexer；When detection unit pressure changes
When, 3 surface of piezoelectric thin film layer generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to the first AD conversion unit；
Two, the hybrid analog-digital simulation electric signal received is converted digital signal by the first AD conversion unit, and exports to the first center
Processor；
Three, the bandpass filtering algorithm that the first central processing unit is stored using itself obtains the Digital Signal Processing received comprising mutual
Feel the digital signal of capacitance information, the digital signal that the low-pass filtering algorithm that the first central processing unit is stored using itself will receive
Processing obtains the digital signal comprising pressure information；
Four, the digital signal calculation processing comprising Inductance and Capacitance information is obtained Inductance and Capacitance and changes over time by the first central processing
ValueAnd exported by the first communication apparatus to the first host computer, the first central processing is by the digital signal comprising pressure information
Calculation processing obtains pressure signalAnd it is exported by the first communication apparatus to the first host computer；
Five, the first host computer changes over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
One host computer is according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value.
When using back-end circuit shown in Fig. 4, the present embodiment uses method two, and sequence carries out according to the following steps:
(1) it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
AC voltage/current signal modulation after export to second electrode 21 and third electrode 22；
When the humidity of second electrode 21 and the corresponding sensor appearance of third electrode 22 changes, humidity sensitive material layer 1
Dielectric constant change, Inductance and Capacitance is generated between second electrode 21 and third electrode 22, Humidity Detection group will contain
The AC analogue electric signal for stating Inductance and Capacitance information is exported to the second demultiplexer；When detection unit pressure changes
When, 3 surface of piezoelectric thin film layer generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to filter unit；
(2) filter unit obtains the hybrid analog-digital simulation electric signal received containing pressure change by the processing of low-pass filter
AC analogue electric signal is simultaneously exported to the first analog-digital converter, and the hybrid analog-digital simulation current signal received is passed through band logical by filter unit
The processing of filter obtains the AC analogue electric signal of the information containing Inductance and Capacitance and exports to the second analog-digital converter；
The AC analogue electric signal containing pressure change received is converted digital signal and defeated by (three) first analog-digital converters
Out to the second central processing unit, the second analog-digital converter converts the AC analogue electric signal of the information containing Inductance and Capacitance received to
Digital signal is simultaneously exported to the second central processing unit；
The digital electric signal received from the first analog-digital converter progress calculation processing is obtained pressure by (four) second central processing units
SignalAnd exported by the second communication apparatus to the second host computer, the second central processing unit will be from the second analog-digital converter
The digital signal progress calculation processing received obtains Inductance and Capacitance and changes over time valueAnd it is exported by the second communication apparatus
To the second host computer；
(5) second host computers change over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
Two host computers are according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value.
During the entire process of method one and method two carry out, the charge-trapping that power module generates second electrode 21,
And front-end circuit and the first back-end circuit/the second back-end circuit power supply by timing control, make to collect energy in the process
Amount and capacitance measurement carry out in turn.The process of timing control is controlled using multiplexer, and back-end circuit is being collected
Switch between energy and detection capacitor.Because humidity variation is relatively slow, second electrode 21 is made to collect energy most of the time, every
5s or so detects a capacitor.
As shown in figure 4, be the signal graph that the corresponding insole area of a small electrode measures direct stress in one section of gait processes,
Signal forward direction rises phase table and shows that foot is just gradually being stepped on to insole, and direct stress increases, and subsequent charge is consumed；Signal reversely descends depression of order
Segment table shows that foot gradually leaves ground, and direct stress reduces.
For each humidity detection unit, value is changed over time according to Inductance and Capacitance, humidity sensitive material can be calculated
The dielectric constant of the bed of material 1 changes with time value, can be in the hope of in conjunction with humidity sensitive material dielectric constant-humidity corresponding relationship
Humidity changes with time data out.Because the size of piezoelectric constant is directly proportional to the dielectric constant of respective material, according to
Piezoelectric material dielectric constant-humidity corresponding relationship changes with time data in conjunction with the humidity acquired, available amendment
The piezoelectric constant of piezoelectric thin film layer 3 after humidity:
According to piezoelectricity relational expressionCollected charge is close in available 3 plane of piezoelectric thin film layer
The relational expression of degree and direct stress, wherein σ is the direct stress perpendicular with thin film planar direction.
Plantar pressure after then correcting humidity changes with time are as follows:
In the present embodiment, power module is collected the charge in second electrode 21 using bridge rectifier, utilizes power supply
The capacitor that module includes is stored, and stored energy can be calculated by following formula:
Wherein, U indicates the voltage of the capacitor.
Claims (3)
1. a kind of plantar pressure sensor, including signal acquisition part and circuit part, it is characterised in that:
One) signal acquisition part
The signal acquisition part point includes at least one detection unit, the detection unit include set gradually from top to bottom it is wet
Sensitive material, piezoelectric thin film layer and first electrode layer are spent, is provided between the humidity sensitive material layer and piezoelectric thin film layer
Have spaced second electrode and third electrode；
The third electrode, piezoelectric thin film layer and first electrode decomposition pressure detection group together；The second electrode and third electricity
Pole forms capacitor by edge effect, and the humidity sensitive material between second electrode and third electrode is as dielectric layer, San Zheyi
Play composition Humidity Detection group；
Two) circuit part
The circuit part includes front-end circuit and back-end circuit；
The front-end circuit includes controller and multiplexer, and the signal output end of the controller passes through multiplexer point
It is not connected with the signal input part of second electrode and third electrode；
The back-end circuit is the first back-end circuit or the second back-end circuit；
A. the first back-end circuit
First back-end circuit includes the first demultiplexer, the first AD conversion unit, the first centre being sequentially connected in series
Manage device, communication apparatus and host computer；
The signal output end of the pressure detecting group and Humidity Detection group is connected with the signal input part of the first demultiplexer；
B. the second back-end circuit
Second back-end circuit includes the second demultiplexer being sequentially connected in series, filter unit, the second AD conversion unit,
Two central processing units, the second communication apparatus and the second host computer；
The filter unit includes in parallel low-pass filter and bandpass filter, and the second analog-to-digital conversion unit includes in parallel the
The signal output of one analog-digital converter and the second analog-digital converter, the low-pass filter is defeated with the signal of the first analog-digital converter
Enter end to be connected, the signal output end of bandpass filter is connected with the signal input part of the second analog-digital converter；Pressure detecting group and
The signal output end of Humidity Detection group is connected with the signal input part of the second demultiplexer；
The circuit part further includes power module, input terminal of the second electrode as collection of energy group and the power module
It is connected, the output end of the power module and the power input of front-end circuit and back-end circuit remove the first host computer/the second
The power input of component except host computer is connected.
2. plantar pressure sensor according to claim 1 or 2, it is characterised in that: the second electrode and third electrode
Cross section be pectinate texture, the branch of the two intersects to form the capacitor of pectination intersection.
3. a kind of detection pressure, humidity and the method for collecting energy, using plantar pressure sensor of any of claims 1 or 2
Realize, it is characterised in that this method be method one or method two, when back-end circuit uses the first back-end circuit this method for
Method one, when back-end circuit uses the second back-end circuit, this method is method two, wherein
I, method one
Method one includes the following steps successively carried out:
One, it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
It exports after AC voltage/current signal modulation to second electrode and third electrode；
When the humidity of second electrode and the corresponding sensor appearance of third electrode changes, the dielectric of humidity sensitive material layer
Constant changes, and Inductance and Capacitance is generated between second electrode and third electrode, and Humidity Detection group will contain the Inductance and Capacitance
The AC analogue electric signal of information is exported to the first demultiplexer；When detection unit pressure changes, piezoelectricity is thin
Film surface generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to the first AD conversion unit；
Two, the hybrid analog-digital simulation electric signal received is converted digital signal by the first AD conversion unit, and exports to the first center
Processor；
Three, the bandpass filtering algorithm that the first central processing unit is stored using itself obtains the Digital Signal Processing received comprising mutual
Feel the digital signal of capacitance information, the digital signal that the low-pass filtering algorithm that the first central processing unit is stored using itself will receive
Processing obtains the digital signal comprising pressure information；
Four, the digital signal calculation processing comprising Inductance and Capacitance information is obtained Inductance and Capacitance and changes over time by the first central processing
ValueAnd exported by the first communication apparatus to the first host computer, the first central processing is by the digital signal comprising pressure information
Calculation processing obtains pressure signalAnd it is exported by the first communication apparatus to the first host computer；
Five, the first host computer changes over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
One host computer is according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value；
II, method two
Method two includes the following steps successively carried out:
(1) it is by a frequency by controllerAc voltage signal export to multiplexer, multiplexer will receive
AC voltage/current signal modulation after export to second electrode and third electrode；
When the humidity of second electrode and the corresponding sensor appearance of third electrode changes, the dielectric of humidity sensitive material layer
Constant changes, and Inductance and Capacitance is generated between second electrode and third electrode, and Humidity Detection group will contain the Inductance and Capacitance
The AC analogue electric signal of information is exported to the second demultiplexer；When detection unit pressure changes, piezoelectricity is thin
Film surface generates charge and is further formed AC analogue current signal；
Detection unit is electric by the AC analogue of the AC analogue voltage signal containing the Inductance and Capacitance information and pressure value variation
Stream signal is exported to filter unit；
(2) filter unit obtains the hybrid analog-digital simulation electric signal received containing pressure change by the processing of low-pass filter
AC analogue electric signal is simultaneously exported to the first analog-digital converter, and the hybrid analog-digital simulation current signal received is passed through band logical by filter unit
The processing of filter obtains the AC analogue electric signal of the information containing Inductance and Capacitance and exports to the second analog-digital converter；
The AC analogue electric signal containing pressure change received is converted digital signal and defeated by (three) first analog-digital converters
Out to the second central processing unit, the second analog-digital converter converts the AC analogue electric signal of the information containing Inductance and Capacitance received to
Digital signal is simultaneously exported to the second central processing unit；
The digital electric signal received from the first analog-digital converter progress calculation processing is obtained pressure by (four) second central processing units
SignalAnd exported by the second communication apparatus to the second host computer, the second central processing unit will be from the second analog-digital converter
The digital signal progress calculation processing received obtains Inductance and Capacitance and changes over time valueAnd it is exported by the second communication apparatus
To the second host computer；
(5) second host computers change over time value according to the Inductance and Capacitance receivedRevised piezoelectric constant is calculated, the
Two host computers are according to the pressure signal receivedCalculate the total electrical charge number of detection unit, finally calculate pressure
Correction value；
During the entire process of the method one and method two carry out, also follow the steps below respectively,
The charge-trapping that power module generates second electrode, and front-end circuit and the first back-end circuit/second back-end circuit
Power supply by multiplexer by timing control, makes to collect energy and capacitance measurement carries out in turn in the process.
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