CN112923955B - Flexible capacitive sensor based on paper aluminum plastic packaging material - Google Patents
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- CN112923955B CN112923955B CN202110240862.1A CN202110240862A CN112923955B CN 112923955 B CN112923955 B CN 112923955B CN 202110240862 A CN202110240862 A CN 202110240862A CN 112923955 B CN112923955 B CN 112923955B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/2405—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by varying dielectric
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
- G01D5/241—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes
- G01D5/2417—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance by relative movement of capacitor electrodes by varying separation
Abstract
The invention discloses a flexible capacitive sensor based on paper aluminum plastic packaging material, which comprises: the capacitor comprises an upper polar plate, a lower polar plate and a capacitance measuring circuit, wherein the upper and lower polar plates are all made of tetra Pak, the aluminum foil layer of tetra Pak is used as a metal electrode, and a Polyethylene (PE) layer is used as an insulating medium, so that the capacitor is directly formed. When in use, the two polar plates are respectively stuck on the surface of a measured object to realize electrical measurement, and a variable polar distance type, a variable area type or a variable medium type capacitive sensor can be constructed according to requirements in actual measurement. The invention can effectively recycle waste tetra Pak packages, greatly improves the added value of the waste tetra Pak packages, manufactures a flexible capacitive sensor with simple process, low cost, environmental protection, can be widely applied to the fields of displacement, speed, corner detection and the like, and has important significance in waste utilization, energy conservation and emission reduction.
Description
Technical Field
The invention relates to a sensor, in particular to a flexible capacitive sensor based on a paper-aluminum-plastic packaging material.
Background
The capacitive sensor is a sensor which takes various capacitors as sensing elements and converts the change of measured physical quantity such as displacement, speed, liquid level, pressure and the like into capacitance change. The sensor usually comprises two conductive electrode plates and an intermediate layer insulating medium, and the measured physical quantity can be converted into the capacitance of the sensor by changing the capacitance parameter of the sensor. The capacitive sensors can be classified into a variable-pole-pitch type, a variable-area type, and a variable-dielectric type, according to the conversion principle. In recent years, flexible capacitive sensors are developed rapidly, the sensors are made of flexible materials, can be bent and changed freely according to different shapes of a measured object and use environments, and are widely applied to various fields such as wearable equipment, textiles and robots due to the flexibility of the sensors in use. However, the manufacturing cost of the sensor is high due to the characteristics of complex processing procedures and difficult integration of the flexible sensor material, and the field is still in the starting stage at present, so that the flexible sensor has huge research prospects and innovative spaces, and the manufacturing of the flexible sensor with simple process and low cost is urgently needed.
The lile package is a series of package products for liquid food developed by lile corporation (Tetra Pak) in sweden, and is widely used for packaging drinks such as milk products, fruit juice beverages and the like. The package is composed of six layers of composite paper consisting of paper, aluminum and plastic. The large-scale use of tetra Pak brings convenience to life, but also causes the difficult problem of waste packaging recycling. At present, two main modes are available for recycling waste tetra Pak, namely, materials of all layers in the packaging paper are separated and respectively recycled; the other way is to crush and hot-press the waste packages to manufacture other plates and the like. However, in any mode, a large amount of financial resources and material resources need to be consumed, a large blank exists in the field of waste tetra Pak packaging and recycling, and how to effectively improve the additional value of the waste tetra Pak packaging and recycling is a current difficult problem in the field.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a flexible capacitive sensor based on a paper-aluminum-plastic packaging material, which has the characteristics of low cost and simple process and can realize recycling of tetra pak.
In order to achieve the purpose, the flexible capacitive sensor based on the paper-aluminum-plastic packaging material comprises a flexible capacitive sensor upper polar plate, a flexible capacitive sensor lower polar plate and a capacitance measuring circuit, wherein a high-dielectric-constant dielectric material layer can be arranged on each of the flexible capacitive sensor upper polar plate and the flexible capacitive sensor lower polar plate;
polar plate and flexible capacitive sensor down plate are the lile packing on the flexible capacitive sensor, the lile packing includes from the top down outside PE layer of lile aluminium foil layer, lile packing aluminium foil layer, the inside PE layer of lile packing cardboard layer, lile packing cardboard layer and the outside PE layer of lile packing cardboard layer that distribute in proper order, and high dielectric constant dielectric material layer covers on the outside PE layer of lile aluminium foil layer.
The capacitance measuring circuit is connected with the tetra Pak aluminum foil layers in the upper and lower polar plates of the flexible capacitive sensor. During manufacturing, two pieces of tetra pak aluminum foil are taken for packaging, the PE layer outside the tetra pak aluminum foil layer in the tetra pak aluminum foil is peeled off to expose the tetra pak aluminum foil layer, and then the lead-out electrode is connected with the tetra pak aluminum foil layer.
The flexible capacitive sensor can be used as a variable-pole-pitch sensor, a variable-area sensor or a variable-medium sensor. When in use, the upper and lower polar plates are oppositely stuck on the surface of the object to be measured.
The invention has the following beneficial effects:
when the flexible capacitive sensor based on the paper-aluminum-plastic packaging material is specifically operated, the tetra Pak packaging is directly adopted as the upper polar plate of the flexible capacitive sensor and the lower polar plate of the flexible capacitive sensor. The tetra Pak packaging bag has the advantages of being flexible, low in cost and high in processability, meanwhile, the process is simple, and the production cost of the flexible sensor is greatly reduced. During manufacturing, waste tetra Pak packaging can be used, so that effective utilization of solid waste resources is realized, and the method is green, environment-friendly, energy-saving and emission-reducing.
Drawings
FIG. 1 is a schematic view of a flexible capacitive sensor according to the present invention;
FIG. 2 is a pictorial view of a capacitive displacement sensor in accordance with the present invention;
fig. 3 is a diagram showing the variation of capacitance with displacement of the capacitive displacement sensor according to the present invention.
The device comprises a flexible capacitive sensor upper polar plate 1, a flexible capacitive sensor lower polar plate 2, an extraction electrode 3, a capacitance measuring circuit 4, a tetra Pak packaging aluminum foil layer 5, a tetra Pak packaging aluminum foil layer 6, a tetra Pak packaging paperboard layer 7, a tetra Pak packaging paperboard layer 8, a tetra Pak packaging paperboard layer inner PE layer 9, a tetra Pak packaging paperboard layer outer PE layer 10 and a high-dielectric-constant dielectric material layer.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings:
referring to fig. 1, the flexible capacitive sensor based on the paper-aluminum-plastic packaging material of the present invention includes a flexible capacitive sensor upper plate 1, a flexible capacitive sensor lower plate 2, and a capacitance measuring circuit 4, wherein both the flexible capacitive sensor upper plate 1 and the flexible capacitive sensor lower plate 2 may be provided with a high dielectric constant dielectric material layer 10; the upper polar plate 1 of the flexible capacitive sensor and the lower polar plate 2 of the flexible capacitive sensor are both packaged in tetra Pak, and the capacitance measuring circuit 4 is connected with the tetra Pak aluminum foil layer 5 in the upper polar plate 1 of the flexible capacitive sensor and the tetra Pak aluminum foil layer 5 in the lower polar plate 2 of the flexible capacitive sensor.
The tetra Pak packaging comprises a tetra Pak aluminum foil layer external PE layer 6, a tetra Pak packaging aluminum foil layer 5, a tetra Pak packaging paperboard layer internal PE layer 8, a tetra Pak packaging paperboard layer 7 and a tetra Pak packaging paperboard layer external PE layer 9 which are sequentially distributed from top to bottom, and a high dielectric constant dielectric material layer 10 covers the tetra Pak aluminum foil layer external PE layer 6. Wherein the aluminum foil layer has metal conductivity and can be used as a capacitor metal electrode. And the PE layer is insulating material, therefore when placing the aluminium foil layer of two tetra Pak packs face to face, the PE layer guarantees as insulating medium that the electric charge on two aluminium foil layers can not neutralize each other, forms the capacitor structure. When the flexible capacitive sensor is manufactured, the conductive aluminum foil layer 5 packaged by the Lele is directly used as a metal electrode of the capacitive sensor, the PE layer 6 outside the Lele aluminum foil layer on the surface of the aluminum foil layer is used as an insulating dielectric medium of the capacitive sensor, and the upper polar plate 1 of the flexible capacitive sensor and the lower polar plate 2 of the flexible capacitive sensor are oppositely adhered to the surface of a measured object when the flexible capacitive sensor is used.
In order to improve the sensitivity of the sensor, the invention is provided with a high dielectric constant dielectric material layer 10, and simultaneously, a tetra Pak aluminum foil layer 5 is connected into a capacitance measuring circuit 4 through an extraction electrode 3 by adopting a heat treatment method. When the device is used, the two polar plates are directly fixed on the surface of a measured object in a face-to-face mode, and external physical quantity is converted into capacitance of the sensor in a mode of changing polar distance, area or medium.
Example one
Referring to fig. 2, the flexible capacitive sensor of the present invention is used to measure displacement, the present invention is fixed on two acrylic plates, and the displacement of the measured object is converted into the change of the relative area of the upper plate 1 and the lower plate 2 of the flexible capacitive sensor, so that the measurement is realized by using a variable area method. The measured data and the fitted straight line are shown in fig. 3. Goodness of fit of R2The displacement sensor has excellent linearity of 0.9918, and can realize accurate displacement measurement in a range of 0-16 cm. In addition, the method can be used for measuring the translation speed of the object by calculating the capacitance change rate in unit time.
Example two
The invention is fixed on two coaxial cylinders/pipes by using a variable area method, and two polar plates of the sensor respectively cover the outer side of the inner cylinder and the inner wall of the outer pipe. The outer circular tube is fixed, the inner cylinder rotates, the rotating angle of the cylindrical shaft can be determined according to the capacitance value of the sensor, the rotating angle measurement is achieved, and the rotating speed of the rotating shaft can be further determined by detecting the capacitance change rate.
EXAMPLE III
The invention can also use a variable medium method to measure the liquid level of the liquid, namely vertically inserting the upper polar plate 1 and the lower polar plate 2 of the flexible capacitive sensor into the liquid and fixing the position of the sensor. The measured liquid is filled in the space between the upper plate 1 and the lower plate 2 of the flexible capacitive sensor and is used as a medium to change the capacitance of the sensor. The current liquid level can be determined by measuring the capacitance, and the liquid inflow or outflow speed can be obtained by measuring the capacitance change rate in a period of time and combining the size of the cross section area of the container.
Claims (4)
1. A flexible capacitive sensor based on a paper-aluminum-plastic packaging material is characterized by comprising a flexible capacitive sensor upper polar plate (1), a flexible capacitive sensor lower polar plate (2) and a capacitance measuring circuit (4), wherein high-dielectric-constant dielectric material layers (10) are arranged on the flexible capacitive sensor upper polar plate (1) and the flexible capacitive sensor lower polar plate (2);
the flexible capacitive sensor upper polar plate (1) and the flexible capacitive sensor lower polar plate (2) are both packaged in tetra Pak, and the capacitance measuring circuit (4) is connected with a tetra Pak aluminum foil layer (5) in the flexible capacitive sensor upper polar plate (1) and a tetra Pak aluminum foil layer (5) in the flexible capacitive sensor lower polar plate (2);
the tetra Pak packaging comprises a tetra Pak aluminum foil layer outer PE layer (6), a tetra Pak packaging aluminum foil layer (5), a tetra Pak packaging paperboard layer inner PE layer (8), a tetra Pak packaging paperboard layer (7) and a tetra Pak packaging paperboard layer outer PE layer (9) which are sequentially distributed from top to bottom, and a high-dielectric-constant dielectric material layer (10) covers the tetra Pak aluminum foil layer outer PE layer (6);
the flexible capacitive sensor is characterized by further comprising two extraction electrodes (3), wherein a tetra Pak aluminum foil layer (5) in the upper polar plate (1) of the flexible capacitive sensor is connected with a capacitance measuring circuit (4) through one extraction electrode (3), and the tetra Pak aluminum foil layer (5) in the lower polar plate (2) of the flexible capacitive sensor is connected with the capacitance measuring circuit (4) through the other extraction electrode (3).
2. The flexible capacitive sensor based on paper-aluminum-plastic packaging material of claim 1, wherein, during the manufacturing, two tetra Pak packages are taken, the PE layer (6) outside the tetra Pak package is peeled off to expose the tetra Pak package aluminum foil layer (5), and the extraction electrode (3) is connected with the tetra Pak package aluminum foil layer (5).
3. The flexible capacitive sensor based on paper-aluminum-plastic packaging material as claimed in claim 1, wherein the flexible capacitive sensor is a variable-pole-distance sensor, a variable-area sensor or a variable-medium sensor, and can be used for measuring displacement, speed, rotation angle, rotation speed, liquid level and flow speed.
4. The flexible capacitive sensor based on the paper-aluminum-plastic packaging material as claimed in claim 1, wherein the conductive aluminum foil layer (5) of the tetra Pak package is directly used as a metal electrode of the capacitive sensor during manufacturing, the PE layer (6) outside the tetra Pak aluminum foil layer on the surface of the aluminum foil layer is used as an insulating dielectric medium of the capacitive sensor, and the upper electrode plate (1) and the lower electrode plate (2) of the flexible capacitive sensor are oppositely stuck on the surface of a measured object during use.
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| CN113720248A (en) * | 2021-09-01 | 2021-11-30 | 西京学院 | Linear displacement measuring device and method based on capacitance sensing |
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