CN110793680A - Plantar pressure detection device - Google Patents
Plantar pressure detection device Download PDFInfo
- Publication number
- CN110793680A CN110793680A CN201810860820.6A CN201810860820A CN110793680A CN 110793680 A CN110793680 A CN 110793680A CN 201810860820 A CN201810860820 A CN 201810860820A CN 110793680 A CN110793680 A CN 110793680A
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- China
- Prior art keywords
- piezoresistive
- arm chip
- sensor array
- analog switch
- circuit
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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
- G01L1/18—Measuring force or stress, in general using properties of piezo-resistive materials, i.e. materials of which the ohmic resistance varies according to changes in magnitude or direction of force applied to the material
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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
Abstract
A plantar pressure detection device belongs to the technical field of sensor detection and mainly comprises a piezoresistive sensor array, a multi-channel analog switch, an impedance conversion circuit, an ARM chip, a current type DAC, a man-machine interaction module, a USB module and an upper computer.
Description
Technical Field
The invention relates to a plantar pressure detection device, and belongs to the technical field of sensor detection.
Background
In modern society, people have higher and higher requirements on self health and life quality, and the collection of specific human physiological parameters becomes more and more important. The physiological parameter of the plantar pressure plays an irreplaceable role in the fields of prevention and diagnosis of foot diseases such as diabetic ulcer and foot, gait analysis of Parkinson patients, design of shoes, rehabilitation of lower limb movement functions and the like. The invention develops a plantar pressure detection device.
Disclosure of Invention
In order to overcome the defects, the invention provides a plantar pressure detection device.
The invention is realized by the following technical scheme: the utility model provides a plantar pressure detection device, is mainly by piezoresistive sensor array, multichannel analog switch, impedance transformation circuit, ARM chip, current type DAC, man-machine interaction module, USB module and host computer constitution, its characterized in that: the piezoresistive sensor array is connected with the multi-path analog switch, the multi-path analog switch is connected with the impedance conversion circuit, the impedance conversion circuit is connected with the ARM chip, the current type DAC is connected with the multi-path analog switch, the ARM chip is connected with the current type DAC, the ARM chip is connected with the human-computer interaction module, the USB module is connected with the ARM chip, and the upper computer is connected with the USB module.
In the piezoresistive sensor array, the sensors adopt piezoresistive thin films called piezoresistive fabrics, and when external pressure acts on the piezoresistive thin films, the resistance of the piezoresistive thin films is reduced along with the increase of the pressure. Piezoresistive fabrics are obtained by coating a common fabric with a polymer having intrinsic conductivity; 12N/mm, the film thickness is 0.8mm, and the maximum normal pressure which can be applied by the material can be 15N/mm by dividing the two2I.e. 15 MPa; in the array, the pressure of the central area is the largest, the pressure of the area which deviates from the center is smaller, the size of the selected sensor unit is 5mm multiplied by 5mm, the density of the corresponding sensor unit is 4 per square centimeter, and the size of the selected sensor array plate is 32cm multiplied by 16cm, so that the sole pressure detection of most of human single feet can be met. The number of sensor cells obtained by dividing the area of the sensor array plate by the area of each sensor cell was 2048. The idea of line-column scanning is used to design the sensor array plate.
The ARM chip adopts the SiM3U167, and partial unit circuits required by the main control board are integrated in the ARM chip and comprise an adjustable constant current source circuit, an analog-to-digital conversion circuit and a USB controller. The other circuit modules are realized by adopting a discrete chip and a peripheral circuit, the power supply circuit selects LD1117-3.3V of ST company and MAX828 of ON Semiconductor company, the multi-way analog switch selects CD74HC4067 of TI company, the impedance transformation circuit selects MC33172 of ON Semiconductor company, and the man-machine interaction interface circuit selects SP3232E and SP3485 of Exar company.
The invention has the advantages that: the plantar pressure detection device has the characteristics of low cost, high spatial precision, simple structure and the like, can acquire plantar pressure data, and is favorable for preventing and diagnosing foot diseases.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention.
In the figure, the piezoresistive transducer array comprises 1, 2, a multi-channel analog switch, 3, an impedance conversion circuit, 4, an ARM chip, 5, a current type DAC, 6, a man-machine interaction module, 7, a USB module, 8 and an upper computer.
Detailed Description
The utility model provides a plantar pressure detection device, is mainly by piezoresistive sensor array 1, multichannel analog switch 2, impedance transformation circuit 3, ARM chip 4, current type DAC5, human-computer interaction module 6, USB module 7 and host computer 8 constitution, its characterized in that: the piezoresistive sensor array 1 is connected with the multi-channel analog switch 2, the multi-channel analog switch 2 is connected with the impedance conversion circuit 3, the impedance conversion circuit 3 is connected with the ARM chip 4, the current type DAC5 is connected with the multi-channel analog switch 2, the ARM chip 4 is connected with the current type DAC5, the ARM chip 4 is connected with the human-computer interaction module 6, the USB module 7 is connected with the ARM chip 4, and the upper computer 8 is connected with the USB module 7.
In the piezoresistive sensor array 1, the sensors are made of piezoresistive thin films called piezoresistive fabrics, and when external pressure acts on the piezoresistive thin films, the resistance of the piezoresistive thin films is reduced along with the increase of the pressure. Piezoresistive fabrics are obtained by coating a common fabric with a polymer having intrinsic conductivity; 12N/mm, the film thickness is 0.8mm, and the maximum normal pressure which can be applied by the material can be 15N/mm by dividing the two2I.e. 15 MPa; in the array, the pressure of the central area is the largest, the pressure of the area which deviates from the center is smaller, the size of the selected sensor unit is 5mm multiplied by 5mm, the density of the corresponding sensor unit is 4 per square centimeter, and the size of the selected sensor array plate is 32cm multiplied by 16cm, so that the sole pressure detection of most of human single feet can be met. The number of sensor cells obtained by dividing the area of the sensor array plate by the area of each sensor cell was 2048. The idea of line-column scanning is used to design the sensor array plate.
The ARM chip 4 adopts the SiM3U167, and partial unit circuits required by the main control board are integrated in the ARM chip and comprise an adjustable constant current source circuit, an analog-to-digital conversion circuit and a USB controller. The other circuit modules are realized by adopting a discrete chip and a peripheral circuit, the power supply circuit adopts LD1117-3.3V of ST company and MAX828 of ON Semiconductor company, the multi-path analog switch adopts CD74HC4067 of TI company, the impedance conversion circuit adopts MC33172 of ONsemiconductor company, and the man-machine interaction interface circuit adopts SP3232E and SP3485 of Exar company.
When the device works, two electrodes of the piezoresistive sensor are positioned on two sides of the piezoresistive film, and the electrodes and the film are tightly attached in the same size. When a pressure is applied to the piezoresistive membrane in the direction normal to the membrane, the resistance R between the two electrodes decreases with increasing pressure, and the voltage u to ground on the top surface of the membrane decreases as I represents a constant current through the sensor cell. The magnitude of the equivalent resistance R can be obtained by detecting the magnitude of the voltage u, and the pressure applied to the sensor unit can be detected. Signals collected by the sensor array reach an impedance conversion circuit through a multi-path analog switch to carry out impedance conversion, and an ARM chip internally comprises two independent 12-bit analog-to-digital converters with the conversion rate of 250ksps, so that two modules of the piezoresistive sensor array can be sampled simultaneously; the system comprises two independent 10-bit current output type digital-to-analog converters, adjustable constant current can be directly output, and the ARM chip transmits information to a human-computer interaction module or transmits the information to an upper computer for display through a USB.
It will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in the embodiments described above without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims.
Claims (3)
1. The utility model provides a plantar pressure detection device, is mainly by piezoresistive sensor array, multichannel analog switch, impedance transformation circuit, ARM chip, current type DAC, man-machine interaction module, USB module and host computer constitution, its characterized in that: the piezoresistive sensor array is connected with the multi-path analog switch, the multi-path analog switch is connected with the impedance conversion circuit, the impedance conversion circuit is connected with the ARM chip, the current type DAC is connected with the multi-path analog switch, the ARM chip is connected with the current type DAC, the ARM chip is connected with the human-computer interaction module, the USB module is connected with the ARM chip, and the upper computer is connected with the USB module.
2. The plantar pressure testing device according to claim 1, wherein: in the piezoresistive sensor array, the sensors adopt piezoresistive thin films called piezoresistive fabrics, and when external pressure acts on the piezoresistive thin films, the resistance of the piezoresistive thin films is reduced along with the increase of the pressure. Piezoresistive fabrics are obtained by coating a common fabric with a polymer having intrinsic conductivity; 12N/mm, the film thickness is 0.8mm, and the maximum normal pressure which can be applied by the material can be 15N/mm by dividing the two2I.e. 15 MPa; in the array, the pressure of the central area is the largest, the pressure of the area which deviates from the center is smaller, the size of the selected sensor unit is 5mm multiplied by 5mm, the density of the corresponding sensor unit is 4 per square centimeter, and the size of the selected sensor array plate is 32cm multiplied by 16cm, so that the sole pressure detection of most of human single feet can be met. The number of sensor cells obtained by dividing the area of the sensor array plate by the area of each sensor cell was 2048. The idea of line-column scanning is used to design the sensor array plate.
3. The plantar pressure testing device according to claim 1, wherein: the ARM chip adopts the SiM3U167, and partial unit circuits required by the main control board are integrated in the ARM chip and comprise an adjustable constant current source circuit, an analog-to-digital conversion circuit and a USB controller. The other circuit modules are realized by adopting a discrete chip and a peripheral circuit, the power supply circuit selects LD1117-3.3V of ST company and MAX828 of ON Semiconductor company, the multi-way analog switch selects CD74HC4067 of TI company, the impedance transformation circuit selects MC33172 of ON Semiconductor company, and the man-machine interaction interface circuit selects SP3232E and SP3485 of Exar company.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810860820.6A CN110793680A (en) | 2018-08-01 | 2018-08-01 | Plantar pressure detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810860820.6A CN110793680A (en) | 2018-08-01 | 2018-08-01 | Plantar pressure detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110793680A true CN110793680A (en) | 2020-02-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810860820.6A Pending CN110793680A (en) | 2018-08-01 | 2018-08-01 | Plantar pressure detection device |
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| CN (1) | CN110793680A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289157A (en) * | 2020-05-08 | 2020-06-16 | 山东爱奥智能科技有限公司 | Circuit and method for measuring pressure distribution through piezoresistive sensing array |
| WO2022260594A3 (en) * | 2021-06-07 | 2023-03-02 | National University Of Singapore | Wearable sensor, method of sensing using a wearable sensor and method for forming a wearable sensor |
-
2018
- 2018-08-01 CN CN201810860820.6A patent/CN110793680A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111289157A (en) * | 2020-05-08 | 2020-06-16 | 山东爱奥智能科技有限公司 | Circuit and method for measuring pressure distribution through piezoresistive sensing array |
| WO2022260594A3 (en) * | 2021-06-07 | 2023-03-02 | National University Of Singapore | Wearable sensor, method of sensing using a wearable sensor and method for forming a wearable sensor |
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Application publication date: 20200214 |
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| WD01 | Invention patent application deemed withdrawn after publication |