CN111855044A - Sole pressure sensing device and method based on porous PDMS - Google Patents
Sole pressure sensing device and method based on porous PDMS Download PDFInfo
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- CN111855044A CN111855044A CN202010810106.3A CN202010810106A CN111855044A CN 111855044 A CN111855044 A CN 111855044A CN 202010810106 A CN202010810106 A CN 202010810106A CN 111855044 A CN111855044 A CN 111855044A
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- 235000013870 dimethyl polysiloxane Nutrition 0.000 title abstract 2
- CXQXSVUQTKDNFP-UHFFFAOYSA-N octamethyltrisiloxane Chemical compound C[Si](C)(C)O[Si](C)(C)O[Si](C)(C)C CXQXSVUQTKDNFP-UHFFFAOYSA-N 0.000 title abstract 2
- 238000004987 plasma desorption mass spectroscopy Methods 0.000 title abstract 2
- 238000012545 processing Methods 0.000 claims abstract description 21
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- 239000012528 membrane Substances 0.000 claims abstract description 12
- 230000004044 response Effects 0.000 claims abstract description 10
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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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/247—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet using distributed sensing elements, e.g. microcapsules
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- Force Measurement Appropriate To Specific Purposes (AREA)
- Measuring And Recording Apparatus For Diagnosis (AREA)
Abstract
The invention provides a sole pressure sensing device and method based on porous PDMS, wherein the device comprises: the pressure sensitive layer, the signal acquisition chamber and the signal processing device; the pressure sensitive layer is arranged at the top of the signal acquisition chamber, and the signal processing device is connected with the signal acquisition chamber; the pressure sensitive layer comprises a flexible membrane, a flexible porous layer and tempered glass from top to bottom, and the tempered glass supports the flexible membrane and the flexible porous layer; the signal acquisition chamber comprises a box body, an illumination light source, a reflector, a supporting plate and an image acquisition module, and light rays emitted by the illumination light source illuminate the whole flexible porous layer through toughened glass; the image acquisition module acquires the image information of the flexible porous layer in real time through the reflector. The invention adopts an optical method, adopts a simpler hardware structure to collect image information, directly carries out surface measurement on the plantar pressure signal, can realize visualization of plantar pressure response only by simple image change, and greatly reduces the data processing operation amount.
Description
Technical Field
The invention relates to gait analysis, in particular to the field of plantar pressure sensing, and more particularly to a system and a method for measuring plantar pressure based on porous PDMS.
Background
A pressure sensor is a device or apparatus that senses pressure and converts the pressure into a usable output signal according to a certain rule. Typically, a pressure sensor comprises a pressure sensitive element and a signal processing element. Wangjoo Lee, Seung-HyeonHong, equal to 2018 proposed a piezoresistive insole based on Polydimethylsiloxane (PDMS) and carbon nanotubes; three film-type piezoelectric in-shoe sensors based on polyvinylidene fluoride (PVDF), Cellulose Nanofiber (CNF) and piezoelectric electret film (EMFi) were developed in 2016 by satura jala, Timo salavaara, Sampo Tuukkanen, et al. The existing pressure sensors based on the principles of piezoelectricity, piezoresistance, capacitance, eddy current and the like mainly convert pressure signals into electric signals. In some occasions needing visual pressure response, such as gait correction of stroke patients, a set of conversion system is needed to convert the electric signals into a visual pressure distribution diagram according to a certain response curve, and the visual pressure distribution diagram is compared with a standard library to realize correction. Because the electrical signal is point measurement, a relatively complex measurement loop and a signal conversion module are arranged in the plantar pressure device, and the computation amount is relatively large when the signal processing is carried out.
Disclosure of Invention
In order to solve the technical problems, the invention adopts an optical method, adopts a simpler hardware structure to collect image information, directly carries out surface measurement on the plantar pressure signal, and then can realize visualization of plantar pressure response only by simple image change. The invention provides a pressure sensing system and a method based on porous PDMS, namely, a film with a certain thickness is poured by mixing a material made of a transparent material, such as Polydimethylsiloxane (PDMS), silica gel and the like, with a pore-forming agent, and the film is used as a pressure sensitive element to manufacture a pressure sensor. The technology realizes the visualization of pressure response and large-range pressure distribution through the change of transparency of the porous membrane under different pressures.
The invention provides the following scheme: a porous PDMS based plantar pressure sensing device comprising:
the pressure sensitive layer, the signal acquisition chamber and the signal processing device; the pressure sensitive layer is arranged at the top of the signal acquisition chamber, and the signal processing device is connected with the signal acquisition chamber;
the pressure sensitive layer comprises a flexible membrane, a flexible porous layer and tempered glass from top to bottom, and the tempered glass supports the flexible membrane and the flexible porous layer;
the signal acquisition chamber comprises a box body, an illumination light source, a reflector, a supporting plate and an image acquisition module, and light rays emitted by the illumination light source illuminate the whole flexible porous layer through toughened glass; the image acquisition module acquires the image information of the flexible porous layer in real time through the reflector.
Furthermore, the flexible membrane is made of PDMS (polydimethylsiloxane) mixed with nano silver particles, is black and is attached to the flexible porous layer, and transmits the acting pressure to the porous layer on the premise of protecting the porous layer from being polluted.
Furthermore, the flexible porous layer is a pressure sensitive element and is made of porous PDMS, the flexible porous layer is white under the action of no pressure, and the transparency is increased when the pressure is enhanced.
Furthermore, the box body supports the whole device, meanwhile, light is concentrated in the signal acquisition chamber, and a supporting plate is arranged below the box body and used for supporting the reflector.
Further, under the action of upper pressure, the flexible porous layer is compressed, the layer thickness is reduced, under different pressures, the transparency is different, so that different pressure responses are realized, when the pressure is greater than a threshold value, the pores are completely flattened, the porous layer is completely transparent, and complete light transmission is realized.
Further, the signal processing device processes the porous layer image information acquired by the image acquisition module into a gray image, the gray image directly shows the large-area pressure distribution condition, and a numerical pressure distribution diagram is given according to the gray-pressure correspondence.
According to another aspect of the present invention, there is also provided a plantar pressure sensing method based on porous PDMS, comprising the following steps:
step 1, a user places feet on a plantar pressure sensing device and stands naturally;
step 2, the signal acquisition chamber acquires images of the flexible porous layer after being stressed and transmits the images to the signal processing device;
and 3, analyzing and displaying the plantar pressure information of the user by the signal processing device, and analyzing and researching the plantar pressure information of the user by researchers in the fields of sports research and biomechanics engineering.
The working principle of the pressure sensing device is as follows:
under the non-pressure effect of the porous layer, the pores of the porous layer are not compressed, light irradiated from the signal acquisition chamber is subjected to diffuse reflection, and an image acquired by the image acquisition module is processed into a gray-scale image with the gray-scale value of 255. When pressure is applied, the pores are compressed, light irradiated from the signal acquisition chamber can partially penetrate through the porous layer and be absorbed by the black flexible membrane, and the image acquired by the image acquisition module is processed into a gray scale image with the gray scale value lower than 255. When the pressure reaches the upper limit, the pores are completely compressed, the porous layer is completely transparent, the light irradiated from the signal acquisition chamber completely passes through the porous layer and is completely absorbed by the black film, and the gray scale value of the gray scale image after the acquisition treatment is 0.
Has the advantages that:
compared with the prior art, the invention has the advantages that:
1. the flexible material is adopted as the response element, the preparation process is simple, the response range and the sensitivity can be flexibly controlled, and meanwhile, the pressing object can be well protected;
2. the image collected by the image collecting module can directly and qualitatively display the pressure distribution condition, has a guiding function, and can directly generate a pressure distribution diagram after simple conversion to quantitatively display the pressure value of each part. The acquisition and processing of pressure response are image transformation, and the calculation amount is far lower than that of other sensing devices in the analysis of large-area pressure distribution.
Drawings
FIG. 1 is a schematic view of a porous PDMS-based pressure sensing device according to the present invention.
Description of reference numerals: the device comprises an illumination light source 1, a reflector 2, a supporting plate 3, a flexible film 4, a flexible porous layer 5, toughened glass 6, a box body 7, an image acquisition module 8 and a computer 9.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the porous PDMS based pressure sensing device includes: the pressure sensitive layer, signal acquisition room and signal processing device. The pressure sensitive layer comprises a flexible film 4, a flexible porous layer 5 and tempered glass 6, light irradiated from the signal acquisition chamber is partially reflected by the flexible porous layer 5, other light passing through is absorbed by the flexible film 4 tightly attached to the flexible porous layer 5, and the tempered glass 6 supports the flexible porous layer 5. The signal acquisition room comprises an illumination light source 1, a reflector 2, a supporting plate 3, a box body 7 and an image acquisition module 8, wherein the illumination light source 1 provides enough brightness, the flexible porous layer 5 is illuminated through toughened glass 6, the image acquisition module 8 acquires image information of the flexible porous layer 5 in real time, the reflector 2 turns a light path, the supporting plate 3 supports the reflector 2, the box body 7 supports the whole device, and meanwhile, light is concentrated in the signal acquisition room. The signal processing device comprises a computer 9, wherein the computer 9 is used for processing the image of the flexible porous layer 5 acquired by the image acquisition module 8 in real time and providing data such as a numerical pressure distribution diagram, a pressure center and the like.
The flexible membrane 4 is made of PDMS (polydimethylsiloxane) mixed with nano silver particles, is characterized by being black, has a good light absorption effect, and can be well attached to the flexible porous layer 5.
The flexible porous layer 5 is a pressure sensitive element and is made of porous PDMS, and is characterized in that the flexible porous layer is white under the action of no pressure, and the transparency is increased when the pressure is enhanced. The response range and sensitivity of the flexible porous layer 5 to pressure can be flexibly controlled by adjusting parameters such as the layer thickness, the pore size, the pore density and the curing agent proportion of the flexible porous layer 5.
The working principle of the pressure sensing device is as follows:
under the non-pressure effect of the porous layer, the pores of the porous layer are not compressed, light irradiated from the signal acquisition chamber is subjected to diffuse reflection, and an image acquired by the image acquisition module is processed into a gray-scale image with the gray-scale value of 255. When pressure is applied, the pores are compressed, light irradiated from the signal acquisition chamber can partially penetrate through the porous layer and be absorbed by the black flexible membrane, and the image acquired by the image acquisition module is processed into a gray scale image with the gray scale value lower than 255. When the pressure reaches the upper limit, the pores are completely compressed, the porous layer is completely transparent, the light irradiated from the signal acquisition chamber completely passes through the porous layer and is completely absorbed by the black film, and the gray scale value of the gray scale image after the acquisition treatment is 0.
According to an embodiment of the present invention, there is also provided a plantar pressure sensing method based on porous PDMS, including the following steps:
step 1, a user places feet on a plantar pressure sensing device and stands naturally;
step 2, the signal acquisition chamber acquires images of the flexible porous layer after being stressed and transmits the images to the signal processing device;
and 3, analyzing and displaying the plantar pressure information of the user by the signal processing device, and analyzing and researching the plantar pressure information of the user by researchers in the fields of sports research and biomechanics engineering.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (7)
1. A plantar pressure sensing device based on porous PDMS is characterized by comprising:
the pressure sensitive layer, the signal acquisition chamber and the signal processing device; the pressure sensitive layer is arranged at the top of the signal acquisition chamber, and the signal processing device is connected with the signal acquisition chamber;
the pressure sensitive layer comprises a flexible membrane, a flexible porous layer and tempered glass from top to bottom, and the tempered glass supports the flexible membrane and the flexible porous layer;
the signal acquisition chamber comprises a box body, an illumination light source, a reflector, a supporting plate and an image acquisition module, and light rays emitted by the illumination light source illuminate the whole flexible porous layer through toughened glass; the image acquisition module acquires the image information of the flexible porous layer in real time through the reflector.
2. The plantar pressure sensing device according to claim 1, wherein the pressure sensing device is composed of a porous PDMS,
the flexible membrane is made of PDMS (polydimethylsiloxane) material mixed with nano silver particles, is black, is attached to the flexible porous layer, and transmits acting pressure to the porous layer on the premise of protecting the porous layer from being polluted.
3. The plantar pressure sensing device according to claim 1, wherein the pressure sensing device is composed of a porous PDMS,
the flexible porous layer is a pressure sensitive element, is made of porous PDMS, is white under the action of no pressure, and has increased transparency when the pressure is enhanced.
4. The plantar pressure sensing device according to claim 1, wherein the pressure sensing device is composed of a porous PDMS,
the box provides the support to whole device, concentrates the light in the signal acquisition room simultaneously, and the box below is provided with the backup pad for support reflector.
5. The plantar pressure sensing device according to claim 1, wherein the pressure sensing device is composed of a porous PDMS,
under the action of upper pressure, the flexible porous layer is compressed, the layer thickness is reduced, under different pressures, the transparency is different, so that different pressure responses are realized, when the pressure is greater than a threshold value, the pores are completely flattened, the porous layer is completely transparent, and the complete light transmission is realized.
6. The plantar pressure sensing device according to claim 1, wherein the pressure sensing device is composed of a porous PDMS,
the signal processing device processes the porous layer image information acquired by the image acquisition module into a gray image, the gray image directly displays the large-area pressure distribution condition, and simultaneously, a numerical pressure distribution diagram is given according to the gray-pressure correspondence.
7. A plantar pressure sensing method based on porous PDMS using the device of claim 1, characterized by comprising the steps of:
step 1, a user places feet on a plantar pressure sensing device and stands naturally;
step 2, the signal acquisition chamber acquires images of the flexible porous layer after being stressed and transmits the images to the signal processing device;
and 3, analyzing and displaying the plantar pressure information of the user by the signal processing device, and analyzing and researching the plantar pressure information of the user by researchers in the fields of sports research and biomechanics engineering.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112834089A (en) * | 2021-02-11 | 2021-05-25 | 福州大学 | Method for preparing wide-detection-range piezoresistive sensor based on sand paper template |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112834089A (en) * | 2021-02-11 | 2021-05-25 | 福州大学 | Method for preparing wide-detection-range piezoresistive sensor based on sand paper template |
| CN112834089B (en) * | 2021-02-11 | 2021-11-30 | 福州大学 | Method for preparing wide-detection-range piezoresistive sensor based on sand paper template |
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