CN210697638U - Sole pressure sensor with functions of detecting pressure, humidity and collecting energy - Google Patents
Sole pressure sensor with functions of detecting pressure, humidity and collecting energy Download PDFInfo
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Abstract
The utility model discloses a plantar pressure sensor with functions of detecting pressure and humidity and collecting energy, which comprises a signal acquisition part and a circuit part, wherein the signal acquisition part comprises at least one detection unit, the detection unit comprises a humidity sensitive material layer, a piezoelectric film layer and a first electrode layer which are sequentially arranged from top to bottom, and a second electrode and a third electrode which are arranged at intervals are arranged between the humidity sensitive material layer and the piezoelectric film layer; the circuit part comprises a front-end circuit, a back-end circuit and a power supply module, and the second electrode is used as an energy collection group and is connected with the input end of the power supply module. The utility model discloses can measure pressure and humidity simultaneously, can also collect the energy and supply power for the circuit part, improve the degree of accuracy of sensor greatly, compensate the defect of current product. The utility model is suitable for a medical equipment technical field.
Description
Technical Field
The utility model belongs to the technical field of medical equipment, detect plantar pressure, humidity and revise, specifically speaking is a plantar pressure sensor with detect pressure, humidity and collect the energy function.
Background
With the improvement of living standard, human health becomes an important concern. According to the biological holographic theory, feet are related to internal organs and organs of human body and have corresponding reflecting regions, so that the feet are closely related to the health and longevity of human body.
The distribution of the human body sole pressure can reflect the function of the lower limbs and the change of the body posture. The pressure parameters of each point of the sole are tested and analyzed, physiological and pathological parameters of the human body in different motion states can be obtained, and the method has important significance for the research of clinical disease diagnosis, postoperative effect evaluation, rehabilitation degree evaluation and the like.
Most of the traditional plantar pressure sensors are greatly influenced by the ambient humidity. When the foot part contacts and leaves the sensor, a capacitor is formed between the foot part and the electrode of the sensor, the dielectric constant of the capacitor is greatly changed along with the humidity of air, and if compensation correction is not carried out, large errors are brought to measurement.
Disclosure of Invention
The utility model aims at providing a plantar pressure sensor with detect pressure, humidity and collect energy function not only can detect plantar pressure and humidity and can also revise the pressure measurement error that causes because of the humidity influence.
The utility model discloses a realize above-mentioned purpose, the technical scheme who adopts as follows:
a plantar pressure sensor with functions of detecting pressure and humidity and collecting energy comprises a signal acquisition part and a circuit part, wherein,
one) signal acquisition part
The signal acquisition part comprises at least one detection unit, the detection unit comprises a humidity sensitive material layer, a piezoelectric film layer and a first electrode layer which are sequentially arranged from top to bottom, and a second electrode and a third electrode which are arranged at intervals are arranged between the humidity sensitive material layer and the piezoelectric film layer;
the third electrode, the piezoelectric film layer and the first electrode form a pressure detection group together; the second electrode and the third electrode form a capacitor through an edge effect, a humidity sensitive material between the second electrode and the third electrode is used as a dielectric layer, and the second electrode, the third electrode and the humidity sensitive material form a humidity detection group together;
two) circuit part
The circuit part comprises a front-end circuit and a back-end circuit;
the front-end circuit comprises a controller and a multiplexer, wherein a signal output end of the controller is respectively connected with signal input ends of the second electrode and the third electrode through the multiplexer;
the back-end circuit is a first back-end circuit or a second back-end circuit;
A. first back-end circuit
The first back-end circuit comprises a first multi-channel demodulator, a first analog-to-digital conversion unit, a first central processing unit, communication equipment and an upper computer which are sequentially connected in series;
the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the first multi-path demodulator;
B. second back end circuit
The second back-end circuit comprises a second multi-path demodulator, a filtering unit, a second analog-to-digital conversion unit, a second central processing unit, second communication equipment and a second upper computer which are sequentially connected in series;
the filtering unit comprises a low-pass filter and a band-pass filter which are connected in parallel, the second analog-to-digital conversion unit comprises a first analog-to-digital converter and a second analog-to-digital converter which are connected in parallel, the signal output end of the low-pass filter is connected with the signal input end of the first analog-to-digital converter, and the signal output end of the band-pass filter is connected with the signal input end of the second analog-to-digital converter; and the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the second multi-path demodulator.
The circuit part still includes power module, the second electrode as energy collection group, with power module's input links to each other, power module's output and the power input of front end circuit and the power input of the subassembly of back end circuit except that first host computer second host computer link to each other.
As a limitation: the cross sections of the second electrode and the third electrode are comb-shaped structures, and branches of the second electrode and the third electrode are mutually crossed to form comb-shaped crossed capacitors.
The utility model discloses owing to adopted foretell technical scheme, it compares with prior art, and the technical progress who gains lies in:
(1) the utility model can measure the pressure and the humidity simultaneously, greatly improves the accuracy of the sensor and makes up the defects of the prior product;
(2) the second electrode and the third electrode form a comb-shaped crossed capacitor for measuring humidity, so that the capacitance value is greatly increased, and the accuracy is improved;
(3) the utility model adopts the passive piezoelectric film and utilizes the positive piezoelectric property thereof to collect the electric energy converted from the mechanical energy and supply power for the back end circuit, thereby having the advantage of low energy consumption;
(4) the utility model has simple and smart structure, realizes multiple functions on one detection unit by utilizing the characteristics of time sequence control and piezoelectric film materials and the edge effect between electrodes, and realizes energy collection and pressure and humidity measurement;
(5) the utility model discloses can make into shoe-pad formula array sensor, detect the change of sole multiple spot department power to whole sole pressure distribution's when detecting the testee and walk change all has important meaning to research such as clinical disease diagnosis, postoperative effect evaluation, recovered degree aassessment.
The utility model is suitable for a medical equipment technical field.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic overall structure diagram of an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a humidity detection set according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of an embodiment of the present invention;
fig. 4 is a schematic diagram of a back-end circuit according to a second configuration of the embodiment of the present invention;
fig. 5 is a signal diagram of the normal stress measured in the corresponding insole area of a small electrode during a walking process according to the embodiment of the present invention.
In the figure: 1. the humidity sensitive material layer 2, a second electrode, a third electrode layer 21, a second electrode, 22, a second electrode, 3, a piezoelectric film layer, 4 and a first electrode layer.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
Embodiment of a sole pressure insole
The embodiment relates to a plantar pressure insole, which comprises a signal acquisition part and a circuit part. As shown in fig. 1 and 2, the signal acquisition part includes at least one detection unit, the detection unit includes a humidity sensitive material layer 1, a second electrode and a third electrode layer 2, a piezoelectric film layer 3 and a first electrode layer 4, which are sequentially arranged from top to bottom, the second electrode and the third electrode layer 2 are provided with a plurality of electrode sets distributed according to the shape of a sole, each electrode set includes a second electrode 21 and a third electrode 22, the cross sections of which are comb-shaped structures, and the branches of the second electrode 21 and the third electrode 22 are mutually crossed to form a comb-shaped crossed capacitor; the third electrode 22, the piezoelectric film layer 3 and the first electrode form a pressure detection group together; the second electrode 21 and the third electrode 22 form a capacitor by edge effect, the humidity sensitive material between the second electrode 21 and the third electrode 22 is used as a dielectric layer, the three form a humidity detection group, and the second electrode 21 is used as an energy collection group.
As shown in fig. 3, the circuit part includes a front-end circuit, a back-end circuit, and a power supply module; the front-end circuit comprises a controller and a multiplexer, wherein a signal output end of the controller is respectively connected with signal input ends of the second electrode 21 and the third electrode 22 through the multiplexer; the back-end circuit comprises a first multi-channel demodulator, a first analog-to-digital conversion unit, a first central processing unit, first communication equipment and a first upper computer which are sequentially connected in series; the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the first multi-path demodulator, the output end of the energy collection group is connected with the input end of the power supply module, and the output end of the power supply module is connected with the power supply input end of the front-end circuit and the power supply input end of the rear-end circuit except the first upper computer.
The back-end circuit of this embodiment may also adopt a structure as shown in fig. 4, and includes a second multi-path demodulator, a filtering unit, a second analog-to-digital conversion unit, a second central processing unit, a second communication device, and a second upper computer, which are connected in series in sequence; the filtering unit comprises a low-pass filter and a band-pass filter which are connected in parallel, the second analog-to-digital conversion unit comprises a first analog-to-digital converter and a second analog-to-digital converter which are connected in parallel, the signal output end of the low-pass filter is connected with the signal input end of the first analog-to-digital converter, and the signal output end of the band-pass filter is connected with the signal input end of the second analog-to-digital converter; and the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the second multi-path demodulator.
There are two methods for detecting pressure, humidity and collecting energy by using this embodiment, and when the back-end circuit shown in fig. 3 is used, the method is a first method, and includes the following steps that are performed in sequence:
one, by the controller, a frequency is set to
The alternating voltage signal is output to the multi-path modulator, and the multi-path modulator modulates the received alternating voltage/current signal and outputs the modulated alternating voltage/current signal to the second electrode 21 and the third electrode 22;
when the humidity of the outer surfaces of the sensors corresponding to the second electrode 21 and the third electrode 22 changes, the dielectric constant of the humidity sensitive material layer 1 changes, mutual inductance capacitance is generated between the second electrode 21 and the third electrode 22, and the humidity detection group outputs alternating current analog electric signals containing the mutual inductance capacitance information to the first multi-path demodulator; when the pressure on the detection unit changes, the surface of the piezoelectric film layer 3 generates charges and further forms an alternating current analog current signal;
the detection unit outputs an alternating current analog voltage signal containing the mutual inductance capacitance information and an alternating current analog current signal with the pressure value change to the first analog-to-digital conversion unit;
the first analog-to-digital conversion unit converts the received mixed analog electric signal into a digital signal and outputs the digital signal to the first central processing unit;
thirdly, the first central processing unit processes the received digital signals by utilizing a self-stored band-pass filtering algorithm to obtain digital signals containing mutual inductance capacitance information, and the first central processing unit processes the received digital signals by utilizing a self-stored low-pass filtering algorithm to obtain digital signals containing pressure information;
fourthly, the first central processing calculates and processes the digital signals containing the mutual inductance capacitance information to obtain the time variation value of the mutual inductance capacitance
And outputting the pressure signals to a first upper computer through first communication equipment, and performing calculation processing on the digital signals containing the pressure information by a first central processing unit to obtain pressure signals
And output to the first upper computer through the first communication equipment;
fifthly, the first upper computer receives the time variation value of the mutual inductance capacitance
Calculating the corrected piezoelectric constant, and the first upper computer receiving the pressure signal
Calculating the total charge number of the detection unit
And finally, calculating a pressure correction value.
When the back-end circuit shown in fig. 4 is used, the second embodiment of the present invention adopts the following steps:
one, the controller controls a frequency to be
The alternating voltage signal is output to the multi-path modulator, and the multi-path modulator modulates the received alternating voltage/current signal and outputs the modulated alternating voltage/current signal to the second electrode 21 and the third electrode 22;
when the humidity of the outer surfaces of the sensors corresponding to the second electrode 21 and the third electrode 22 changes, the dielectric constant of the humidity sensitive material layer 1 changes, mutual inductance capacitance is generated between the second electrode 21 and the third electrode 22, and the humidity detection group outputs alternating current analog electric signals containing the mutual inductance capacitance information to the second multi-path demodulator; when the pressure on the detection unit changes, the surface of the piezoelectric film layer 3 generates charges and further forms an alternating current analog current signal;
the detection unit outputs an alternating current analog voltage signal containing the mutual inductance capacitance information and an alternating current analog current signal with the pressure value change to the filtering unit;
the filtering unit processes the received mixed analog electric signal through a low-pass filter to obtain an alternating current analog electric signal containing pressure change and outputs the alternating current analog electric signal to the first analog-to-digital converter, and the filtering unit processes the received mixed analog current signal through a band-pass filter to obtain an alternating current analog electric signal containing mutual inductance capacitance information and outputs the alternating current analog electric signal to the second analog-to-digital converter;
thirdly, the first analog-to-digital converter converts the received alternating current analog electric signal containing the pressure change into a digital signal and outputs the digital signal to a second central processing unit, and the second analog-to-digital converter converts the received alternating current analog electric signal containing the mutual inductance capacitance information into the digital signal and outputs the digital signal to the second central processing unit;
(IV) the second central processing unit calculates and processes the digital electric signal received from the first analog-to-digital converter to obtain a pressure signal
And the digital signals received from the second analog-to-digital converter are calculated and processed by a second central processing unit to obtain the time-varying value of the mutual inductance capacitor
And output to a second upper computer through second communication equipment;
(V) the second upper computer receives the time variation value of the mutual inductance capacitance
Calculating the corrected piezoelectric constant, and the second upper computer receiving the pressure signal
Calculating the total charge number of the detection unit
And finally, calculating a pressure correction value.
In the whole process of the first method and the second method, the power supply module collects the charges generated by the second electrode 21 and supplies power to the front-end circuit and the first back-end circuit/second back-end circuit, and in the process, the collected energy and the capacitance measurement are alternately performed through the time sequence control. The time sequence control process is that a multiplexer is used for controlling, and the back-end circuit is switched between the energy collection and the detection capacitor. Because the humidity changes relatively slowly, the second electrode 21 collects energy most of the time and the capacitance is detected every 5s or so.
As shown in fig. 4, it is a signal diagram of the normal stress measured in the insole area corresponding to a small electrode during a walking process, and the positive rising stage of the signal indicates that the foot is gradually stepping on the insole, the normal stress is increased, and then the electric charge is consumed; the backward descending phase of the signal indicates that the foot gradually leaves the ground and the normal stress is reduced.
For each humidity detection unit, the variation value of the mutual inductance capacitance with time is used
The change value of the dielectric constant of the humidity sensitive material layer 1 along with the time can be calculated, and the change data of the humidity along with the time can be calculated by combining the corresponding relation of the dielectric constant of the humidity sensitive material and the humidity. Since the magnitude of the piezoelectric constant is proportional to the dielectric constant of the corresponding material, the piezoelectric constant of the piezoelectric thin film layer 3 after humidity correction can be obtained by combining the obtained change data of humidity with time according to the corresponding relationship between the dielectric constant and humidity of the piezoelectric material:
according to the piezoelectric relation
The relation between the charge density and the normal stress collected on the plane of the piezoelectric film layer 3 can be obtained
Where σ is the positive stress perpendicular to the film plane direction.
The change of the plantar pressure with time after correcting the humidity is as follows:
in this embodiment, the power module collects charges on the second electrode 21 by using the bridge rectifier circuit, and stores the charges by using a capacitor included in the power module, where the stored energy can be calculated by the following formula:
where U represents the voltage of the capacitor.
Claims (2)
1. A plantar pressure sensor with functions of detecting pressure and humidity and collecting energy comprises a signal acquisition part and a circuit part, and is characterized in that:
one) signal acquisition part
The signal acquisition part comprises at least one detection unit, the detection unit comprises a humidity sensitive material layer, a piezoelectric film layer and a first electrode layer which are sequentially arranged from top to bottom, and a second electrode and a third electrode which are arranged at intervals are arranged between the humidity sensitive material layer and the piezoelectric film layer;
the third electrode, the piezoelectric film layer and the first electrode form a pressure detection group together; the second electrode and the third electrode form a capacitor through an edge effect, a humidity sensitive material between the second electrode and the third electrode is used as a dielectric layer, and the second electrode, the third electrode and the humidity sensitive material form a humidity detection group together;
two) circuit part
The circuit part comprises a front-end circuit and a back-end circuit;
the front-end circuit comprises a controller and a multiplexer, wherein a signal output end of the controller is respectively connected with signal input ends of the second electrode and the third electrode through the multiplexer;
the back-end circuit is a first back-end circuit or a second back-end circuit;
A. first back-end circuit
The first back-end circuit comprises a first multi-channel demodulator, a first analog-to-digital conversion unit, a first central processing unit, communication equipment and an upper computer which are sequentially connected in series;
the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the first multi-path demodulator;
B. second back end circuit
The second back-end circuit comprises a second multi-path demodulator, a filtering unit, a second analog-to-digital conversion unit, a second central processing unit, second communication equipment and a second upper computer which are sequentially connected in series;
the filtering unit comprises a low-pass filter and a band-pass filter which are connected in parallel, the second analog-to-digital conversion unit comprises a first analog-to-digital converter and a second analog-to-digital converter which are connected in parallel, the signal output end of the low-pass filter is connected with the signal input end of the first analog-to-digital converter, and the signal output end of the band-pass filter is connected with the signal input end of the second analog-to-digital converter; the signal output ends of the pressure detection group and the humidity detection group are connected with the signal input end of the second multi-path demodulator;
the circuit part still includes power module, the second electrode as energy collection group, with power module's input links to each other, power module's output and the power input of front end circuit and the power input of the subassembly of back end circuit except that first host computer second host computer link to each other.
2. The plantar pressure sensor with functions of detecting pressure, humidity and collecting energy according to claim 1, wherein: the cross sections of the second electrode and the third electrode are comb-shaped structures, and branches of the second electrode and the third electrode are mutually crossed to form comb-shaped crossed capacitors.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921044740.XU CN210697638U (en) | 2019-07-05 | 2019-07-05 | Sole pressure sensor with functions of detecting pressure, humidity and collecting energy |
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| CN201921044740.XU CN210697638U (en) | 2019-07-05 | 2019-07-05 | Sole pressure sensor with functions of detecting pressure, humidity and collecting energy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110200636A (en) * | 2019-07-05 | 2019-09-06 | 北京中硕众联智能电子科技有限公司 | Plantar pressure sensor and its detection pressure, humidity and the method for collecting energy |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110200636A (en) * | 2019-07-05 | 2019-09-06 | 北京中硕众联智能电子科技有限公司 | Plantar pressure sensor and its detection pressure, humidity and the method for collecting energy |
| CN110200636B (en) * | 2019-07-05 | 2024-02-02 | 北京中硕众联智能电子科技有限公司 | Plantar pressure sensor and method for detecting pressure, humidity and collecting energy by plantar pressure sensor |
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