CN112781482B - Method for measuring space curvature of deformable curved surface and method for manufacturing inductive space curvature measurement sensitive element - Google Patents
Method for measuring space curvature of deformable curved surface and method for manufacturing inductive space curvature measurement sensitive element Download PDFInfo
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- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/28—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures
- G01B7/293—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring contours or curvatures for measuring radius of curvature
Abstract
The invention relates to a method for measuring the space curvature of a deformable curved surface and a method for manufacturing an inductive space curvature measurement sensitive element, which solve the technical problems of complex curvature measurement method, inconvenient engineering operation and high cost of the existing flexible mechanical arm, and the measurement method comprises the following steps: firstly, manufacturing a screen printing plate, wherein the screen printing plate is provided with meshes of a coil part; secondly, clinging the screen printing plate to the surface of the bendable deformable object, coating a layer of conductive powder on the screen printing plate, extruding the conductive powder by using a scraper to transfer the conductive powder to the surface of the bendable deformable object through meshes of a coil part on the screen printing plate, and forming a conductive coil on the surface of the bendable deformable object; then, one end of the conductive coil is connected with an interface lead, and the other end of the conductive coil is connected with an interface lead; and finally, measuring the inductance value of the conductive coil, and calculating the curvature of the bendable deformable object according to the inductance value of the conductive coil. The invention is widely used for measuring the deformation parameters of the object.
Description
Technical Field
The invention relates to the technical field of measurement of deformation of the surface of an object, in particular to a method for measuring the space curvature of a deformable curved surface and a method for manufacturing an inductive space curvature measurement sensitive element.
Background
In the process of controlling the action of the flexible mechanical arm formed by silica gel perfusion, the curvature parameter of the bending deformation of the flexible mechanical arm needs to be measured, the prior art mainly adopts a computer vision method and an optical fiber measurement network, and the computer vision method mainly adopts laser 3D scanning, so that the method has high precision, does not need contact, but has complex operation, large occupied area, poor real-time performance and inconvenience in engineering application; the optical fiber network is formed by laying flexible optical fibers, can measure the shape of a curved surface with high precision, but has high cost and great process difficulty.
Disclosure of Invention
The invention provides a method for measuring the space curvature of a deformable curved surface and a method for manufacturing an inductive space curvature measurement sensitive element, aiming at solving the technical problems of complexity, inconvenient engineering operation and high cost of the existing flexible mechanical arm curvature measurement method. The method for measuring the space curvature of the deformable curved surface does not change the original surface mechanical characteristics of the object and depends on the pure flexibility characteristic.
The invention provides a method for measuring the space curvature of a deformable curved surface, which comprises the following steps:
step 4, connecting one interface lead at one end of the conductive coil, and connecting one interface lead at the other end of the conductive coil; the conductive coil and the two interface leads form an inductive space curvature measurement sensitive element;
and 5, measuring the inductance value of the conductive coil when the bendable deformable object is subjected to bending deformation, and calculating the curvature of the bendable deformable object according to the inductance value of the conductive coil.
Preferably, in step 2, the screen plate is provided with meshes of the circular coil portions; in the step 3, the conductive coil formed on the surface of the bendable deformation object is a circle-shaped conductive coil.
Preferably, in step 2, the screen plate is provided with meshes of rectangular coil portions; in the step 3, the conductive coil formed on the surface of the bendable deformation object is a rectangular conductive coil.
Preferably, in step 3, the conductive powder is carbon ink, carbon-based conductive powder, or metal conductive powder.
The invention also provides a method for measuring the space curvature of the deformable curved surface, which comprises the following steps:
step 4, preparing a second flexible film, and forming two lead holes in the second flexible film;
and 7, measuring the inductance value of the conductive coil when the bendable deformable object is subjected to bending deformation, and calculating the curvature of the bendable deformable object according to the inductance value of the conductive coil.
Preferably, the flexible film is a polyimide film or a polyamide film.
Preferably, in step 1, the screen plate is provided with meshes of the circular coil portions; in the step 3, the formed conductive coil is a circle-shaped conductive coil.
Preferably, in step 1, the screen plate is provided with meshes of the rectangular coil portions; in the step 3, the formed conductive coil is a rectangular conductive coil.
Preferably, in step 3, the conductive powder is carbon ink, carbon-based conductive powder, or metal conductive powder.
The invention also provides a manufacturing method of the inductive space curvature measurement sensitive element, which comprises the following steps:
step 4, preparing a second flexible film, and forming two lead holes in the second flexible film;
and 5, covering the second flexible film on the first flexible film, respectively leading the two interface leads out of the two lead holes, and adhering the second flexible film and the first flexible film together by using an adhesive.
The invention has the advantages of convenient measurement, simple structure, good stability of sensing characteristic, high sensitivity and high precision. By adopting the flexible printing process, the production process is mature, the size is stable, the high temperature can be resisted, and the consistency of the inductance characteristic of each produced inductance sensor is good. The flexible film pasting mode ensures that the carbon ink is protected at the inner side, and different packaging processes can be realized without damaging the circuit.
And fixing the conductive powder on the object to be measured, forming a coil on the surface of the object to be measured, and obtaining the deformation of the object to be measured according to the inductance value of the coil. The method can be applied to measurement under the situation of large curvature change of the complex curved surface. The coil turns can be changed in density, shape and carbon ink parameters, so that the good relation between the inductance value and the curvature is further improved, the measurement precision and sensitivity of the measured parameters are improved, and various different characteristic requirements can be met. .
Further features and aspects of the present invention will become apparent from the following description of the embodiments with reference to the accompanying drawings.
Drawings
FIG. 1 is a schematic structural diagram of an inductive space curvature measuring sensor according to the present invention in a plane without curvature;
FIG. 2 is a schematic structural diagram of the inductive space curvature measuring sensor shown in FIG. 1 screen printed under the plane of curvature of the object to be measured;
FIG. 3 is a schematic view of an inductive space curvature measuring sensor deformed in response to bending deformation of an object to be measured;
FIG. 4 is a schematic circuit diagram of an inductive space curvature measurement sensing element connected to a measurement circuit;
FIG. 5 is an equivalent circuit diagram of FIG. 4;
FIG. 6 is a graph of the relationship between the curvature of the object to be measured and the ratio of the inductance value after bending and the inductance value in the planar state of the inductive space curvature measuring sensor;
fig. 7 is a schematic view of the structure of a screen plate;
FIG. 8 is a schematic structural diagram of an inductive space curvature measuring sensor made of two polyimide films;
FIG. 9 is a schematic structural diagram of an inductive space curvature measurement sensor fabricated from two polyimide films;
FIG. 10 is a schematic view of an inductive space curvature measurement sensor with rectangular conductive carbon ink coils in a plane without curvature;
FIG. 11 is a layout view of four of the inductive spatial curvature measurement sensing elements of FIG. 10 having rectangular shaped conductive coils;
FIG. 12 is a schematic view of the plurality of rectangular coil sensors of FIG. 11 secured to a data glove;
FIG. 13 is a schematic diagram of an inductive space curvature measurement sensor with a rectangular conductive coil for a sensor made with polyimide film;
FIG. 14 is a schematic diagram of an inductive space curvature measurement sensor with a rectangular shaped conductive coil attached to a space physics acquisition satellite.
The symbols in the figures illustrate:
101. a circular conductive carbon ink coil 102, an interface lead 103, an interface lead; 301. an object to be measured.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments thereof with reference to the attached drawings.
Example 1
As shown in fig. 1, the inductive space curvature measurement sensing element includes: a circular conductive carbon ink coil 101, an interface lead 102, and an interface lead 103. The coil type conductive carbon ink coil 101 is provided with a plurality of turns, and adjacent turns are insulated from each other. The interface lead 102 is connected to one end of the circular conductive carbon ink coil 101, and the interface lead 103 is connected to the other end of the circular conductive carbon ink coil 101. The material of the circular conductive carbon ink coil 101 is conductive carbon ink.
When the inductive space curvature measurement sensitive element is applied, the circular conductive carbon ink coil 101 is printed or adhered to a measured object in a circular shape. When printing or pasting, the sensitivity of the sensitive element can be improved by arranging as many turns as possible.
As shown in fig. 2, the inductive space curvature measurement sensing element is screen printed on the surface of the object to be measured 301. The circular conductive carbon ink coil 101 is insulated from the object 301 to be measured.
The length and width of the object 301 to be measured are not limited, and the circular conductive carbon ink coils 101 with different sizes can be designed according to different requirements. The measuring range of the inductive space curvature measuring sensitive element depends on the space magnetic field distribution of the circular conductive carbon ink coil 101 instead of the distance between turns of the circular conductive carbon ink coil 101, so that a large-curvature surface can be measured. As shown in fig. 3, when the object 301 to be measured is bent and deformed, the circular conductive carbon ink coil 101 is deformed, the spatial magnetic field structure of the circular conductive carbon ink coil 101 is changed, the inductance value is changed in an equal proportion or an equal amount, and the inductance value of the circular conductive carbon ink coil 101 is reduced due to the spatial structural deformation thereof. When the sensor of the embodiment is used for curvature measurement, the deformation of the circular conductive carbon ink coil 101 can be obtained by measuring the change of the inductance value of the circular conductive carbon ink coil 101, and the deformation of the object 301 to be measured can be further known, so that the change value of the external parameter causing the curvature change of the object 301 to be measured can be obtained.
As shown in FIGS. 4 and 5, the measuring circuit includes an operational amplifier OA, a resistor R, a positive input terminal of the operational amplifier OA is grounded, the resistor R is connected to a negative input terminal of the operational amplifier OA, an interface lead 103 of the inductive space curvature measuring sensor is connected to an output terminal of the operational amplifier OA, an interface lead 102 of the inductive space curvature measuring sensor is connected to an operational amplifierThe inverting input of the amplifier OA is connected. Input voltage signal V i Connected to the inverting input of the operational amplifier OA to output a voltage signal V o And accessing the singlechip to perform calculation.
Input voltage signal V i And an output voltage signal V o The formula of (1) is as follows:
V i ＝U m s i nωt (1)
in the formulae (1) and (2), V i Is a sinusoidal voltage signal, omega being the frequency of the signal generator; j is an imaginary unit of a complex number, i.e.
R is known resistance, resistance Rx, inductance L X The equivalent resistance and inductance of the detected inductance (namely the inductive space curvature measurement sensitive element); the value of resistance Rx is measured using an LCR bridge instrument.
From the above V o Can derive L from equation (2) X ：
The inductance of the inductive space curvature measuring sensitive element in the plane shape is L 0 ，L 0 The values of (a) were measured using an LCR bridge instrument. When the inductive space curvature measuring sensitive element is attached to the surface of the object 301 to be measured, when the object 301 to be measured is subjected to bending deformation, the curvature θ of the object 301 to be measured can be derived by the following formula:
as shown in fig. 6, a curve of the relationship between the curvature of the object under test 301 and the inductance value of the inductive spatial curvature measurement sensor is calculated by MATLAB software.In FIG. 6, the abscissa is the curvature θ and the ordinate is
The object to be measured 301 capable of bending deformation may be a flexible mechanical arm (e.g., a flexible mechanical arm made of silicone).
The method for arranging the inductive space curvature measurement sensitive element on the surface of the flexible mechanical arm mainly comprises the following steps:
step S101, preparing a flexible mechanical arm;
step S102, making a screen printing plate 4 by a photoengraving method by using a photosensitive material, wherein meshes 4-1 of a circular coil part on the screen printing plate are through holes, and meshes of a non-coil part are blocked, as shown in FIG. 7;
step S103, clinging the screen printing plate 4 to the surface of the flexible mechanical arm, coating a layer of carbon ink on the screen printing plate 4, extruding the carbon ink by the scraper 5, and transferring the carbon ink to the surface of the flexible mechanical arm through the meshes 4-1 of the coil part on the screen printing plate to form a circular conductive carbon ink coil 101 (shown in figure 2);
in step S104, the interface lead 102 is attached to one end of the circular conductive carbon ink coil 101 by an adhesive, and the interface lead 103 is attached to the other end of the circular conductive carbon ink coil 101 by an adhesive.
Referring to fig. 8 and 9, another method for providing an inductive space curvature measuring sensor on a surface of a flexible manipulator is described, which mainly comprises the following steps:
step S201, a screen plate 4 is manufactured by a photoengraving method by using a photosensitive material, and meshes 4-1 of a circular coil part on the screen plate are through holes, but meshes of a non-coil part are blocked, as shown in FIG. 7.
Step S202, preparing a first polyimide film 6, and cutting out the required size according to the size of the flexible mechanical arm;
step S203, clinging a screen printing plate 4 to a first polyimide film 6, coating a layer of carbon ink on the screen printing plate 4, extruding the carbon ink by a scraper 5, printing the carbon ink on the first polyimide film 6 to form a circular conductive carbon ink coil 101, sticking one interface lead to one end of the circular conductive carbon ink coil 101 by using an adhesive, and sticking the other interface lead to the other end of the circular conductive carbon ink coil 101 by using the adhesive;
step S204, preparing a second polyimide film 7, wherein the size of the second polyimide film is the same as that of the first polyimide film, and two lead holes (lead holes 7-1 and 7-2) are formed in the second polyimide film 7;
step S205, covering the second polyimide film 7 on the first polyimide film 6, passing one of the interface leads out of the lead hole 7-1, passing the other interface lead out of the lead hole 7-2, and bonding the second polyimide film to the first polyimide film with an adhesive 8 (bonding the outer edge of the second polyimide film to the outer edge of the first polyimide film), where the second polyimide film is an upper layer polyimide film and the first polyimide film is a lower layer polyimide film.
Step S206, the lower polyimide film is stuck to the surface of the flexible robot with an adhesive.
The inductive space curvature measurement sensitive element manufactured by the method can be reused, namely, the lower polyimide film can be directly used for measurement of the next flexible mechanical arm after being removed from the surface of the flexible mechanical arm.
In order to make the measurement result more accurate, the measurement system is calibrated, and the calibration process is as follows: firstly, calculating data corresponding to the deformation of a to-be-detected object and the inductance, and measuring the inductance value under the standard curvature; to prevent accidental factors during calibration, multiple data sets at different curvatures are collected. Next, a functional relationship L = F (θ) of inductance value-bending amount is fitted by a neural network. Then, according to the circuit diagram shown in fig. 5, a frequency sweep is performed through a sine wave of 600Hz emitted by the signal generator, so as to obtain the resonant frequency when the inductance resonates. Then, the value of the resonant frequency is substituted into the formula
The inductance value is calculated. And finally, recording the functional relation L = F (theta) into the single chip microcomputer to obtain a fitted curve.
It should be noted that the material of the circular conductive coil is not limited to carbon ink, and may be carbon-based conductive powder (such as graphite and carbon fiber), or metal conductive powder (such as nano silver particles and metal fibers).
The polyimide film may be replaced with a flexible film such as a polyamide film. The polyimide film has better mechanical property, heat resistance and electrical insulation property, the continuous use temperature of the polyimide film can reach 200 ℃, and the volume resistivity of the polyimide film reaches 10 13 Omega cm. On the other hand, the polyimide film is favorable for the fixed connection between the flexible film and the object to be measured, and the flexible film is prevented from sliding on the surface of the object to be measured.
The inductance coil changes along with the change of the curvature of the measured object, and the inductance coil can generate larger elastic deformation capacity by depending on the elasticity of the flexible film. The flexible film is adopted for manufacturing, so that the flexible film has the advantages of simple production process, reliable production, good product stability, diversified performance and appearance and low manufacturing cost, can ensure the consistency of the characteristic requirements of the final assembly circuit and conforms to mass production. The sensor has good flexibility due to the flexible film, has a large enough bending deformation measurement range and good structural flexibility, can be applied to various objects with complex curved surfaces, such as soft robots for self-sensing, and has industrial and engineering utilization values; meanwhile, the bending deformation performance is good, the plastic can be well recovered when the bending amount is large, the unrecoverable plastic stretching deformation is not easy to occur, and the repeated performance of multiple bending is good; by adjusting the coil arrangement structure mode and the distance between the coil width and the turn, the inductance value and the curvature change value can keep a good functional relation, and the measurement precision and the sensitivity of the measured parameters are further improved.
Example 2
This embodiment describes a rectangular coil structure, such as a single rectangular conductive carbon ink coil 201 shown in fig. 10, where the rectangular conductive carbon ink coil 201 has multiple turns with insulation between adjacent turns. The interface lead 202 is connected with one end of the rectangular conductive carbon ink coil 201, and the interface lead 203 is connected with the other end of the rectangular conductive carbon ink coil 201. The number of lead interfaces is also specifically chosen based on the accuracy and the magnitude of the surface curvature change of the specific measured object.
As shown in fig. 11, or a plurality of rectangular conductive carbon ink coils 201 may be used as a whole, and the number of lead interfaces is also specifically selected according to the accuracy and the surface curvature variation width of the specific measured object.
The process applied to the object to be measured which can be bent and deformed is as follows: firstly, a screen plate is manufactured by using a photosensitive material through a photoengraving method, and meshes of a rectangular coil part on the screen plate are through holes, while meshes of a non-coil part are blocked; secondly, clinging a screen printing plate to the surface of a measured object, coating a layer of carbon ink on the screen printing plate, extruding the carbon ink by a scraper blade, and transferring the carbon ink to the surface of the measured object through meshes of a rectangular coil part on the screen printing plate to form a rectangular conductive carbon ink coil 201 with equal inter-turn spacing; then, the interface lead 202 is attached to one end of the rectangular conductive carbon ink coil 201 by an adhesive, and the interface lead 203 is attached to the other end of the rectangular conductive carbon ink coil 201 by an adhesive.
As shown in fig. 12, taking the application to a data glove as an example (the data glove is attached to the skin when in use), a screen printing plate is manufactured, the number of turns of the whole coil of the mesh arranged on the screen printing plate is 20, the distance between the turns is 3mm, and the width of the mesh is 1mm; then, tightly attaching the manufactured screen printing plate on the data glove, putting carbon ink, and extruding by using a scraper to enable the carbon ink to be imprinted on the data glove; and then, the interface leads are adhered to two ends of the carbon ink coil through an adhesive.
Referring to fig. 13, another method for manufacturing the rectangular conductive carbon ink coil 201 is to print carbon ink on the polyimide film 401 by a screen printing process, and then stick the polyimide film 401 to the surface of the object to be measured by using an adhesive, so as to fix the rectangular conductive carbon ink coil 201 on the object to be measured. After the plurality of rectangular conductive carbon ink coils 201 and the flexible film 401 are fixed together, multi-angle bending or deformation can be realized, the flexible carbon ink coil has good flexibility characteristics, and can be tightly attached to the surface of a measured object in any shape or attached to the body of the measured object in any shape. When the bending deformation is rectangular, the bending direction can be distinguished.
As shown in fig. 14, taking the application to space physics survey satellites as an example,
step S401, prepare a first polyimide film, and cut into a rectangle.
Step S402, a screen printing plate is manufactured, and rectangular coil meshes are formed on the screen printing plate.
Step S403, tightly attaching the screen printing plate to the first polyimide film, coating a layer of carbon ink on the screen printing plate, and extruding the carbon ink by using a scraper to enable the carbon ink to be imprinted on the first polyimide film to form a rectangular conductive carbon ink coil; adhering one interface lead wire to one end of the rectangular conductive carbon ink coil by using an adhesive, and adhering the other interface lead wire to the other end of the rectangular conductive carbon ink coil by using the adhesive;
step S404, preparing a second polyimide film, cutting the second polyimide film into a rectangle, forming two lead holes on the second polyimide film,
step S405, covering a second polyimide film on the first polyimide film, respectively leading out two interface leads from two lead holes of the second polyimide film, and adhering the outer edge of the second polyimide film and the outer edge of the first polyimide film together by using an adhesive.
Step S406, the prepared three-layer inductive sensor 501 is closely attached to the satellite solar panel 9-1 of the space physical detection satellite 9 by using an adhesive, namely, the first polyimide film is adhered to the satellite solar panel 9-1 of the space physical detection satellite. The satellite solar panel 9-1 can be folded.
The measuring circuit of this embodiment measures the curvature of the measured object by measuring the inductance value, as in the measuring circuit of embodiment 1.
The rectangular conductive coil is not limited to carbon ink, and may be carbon-based conductive powder (such as graphite and carbon fiber), or metal conductive powder (such as nano silver particles and metal fibers).
The polyimide film may be replaced with a flexible film such as a polyamide film.
The inductive spatial curvature measurement sensing elements provided in embodiments 1 and 2 can also be applied to wearable devices, curvature detection devices, or auxiliary devices of various electronic devices.
The conductive carbon ink coil of the inductive space curvature measurement sensitive element is in a circular shape, and has better performance than other geometric shapes such as a rectangle.
The above description is only for the purpose of illustrating preferred embodiments of the present invention and is not to be construed as limiting the present invention, and it is apparent to those skilled in the art that various modifications and variations can be made in the present invention.
Claims (10)
1. A method for measuring the space curvature of a deformable curved surface is characterized by comprising the following steps:
step 1, preparing a bendable deformable object;
step 2, manufacturing a screen printing plate, wherein the screen printing plate is provided with meshes of a coil part;
step 3, clinging the screen printing plate to the surface of the bendable deformable object, coating a layer of conductive powder on the screen printing plate, extruding the conductive powder by using a scraper to transfer the conductive powder to the surface of the bendable deformable object through meshes of a coil part on the screen printing plate, and forming a conductive coil on the surface of the bendable deformable object;
step 4, connecting an interface lead at one end of the conductive coil, and connecting an interface lead at the other end of the conductive coil; the conductive coil and the two interface leads form an inductive space curvature measurement sensitive element;
step 5, when the bendable deformable object is bent and deformed, measuring the inductance value of the conductive coil, and calculating the curvature of the bendable deformable object according to the inductance value of the conductive coil; the measuring circuit comprises an Operational Amplifier (OA), a resistor (R),the non-inverting input terminal of the Operational Amplifier (OA) is grounded, the resistor (R) is connected with the inverting input terminal of the Operational Amplifier (OA), the interface lead connected with one end of the conductive coil is connected with the output terminal of the Operational Amplifier (OA), the interface lead connected with the other end of the conductive coil is connected with the inverting input terminal of the Operational Amplifier (OA), and a voltage signal V is input to the inverting input terminal of the Operational Amplifier (OA) i The voltage signal at the output of the Operational Amplifier (OA) is V o ，
Input voltage signal V i And an output voltage signal V o The formula of (1) is as follows:
V i ＝U m sinωt (1)
in the formulae (1) and (2), V i Is a sinusoidal voltage signal, ω is the frequency of the signal generator; j is an imaginary unit of the complex number, i.e.
R is known resistance, resistance Rx, inductance L X Measuring the equivalent resistance and the inductance of the sensitive element for the inductive space curvature;
from the above V o Can derive L from equation (2) X ：
The inductance of the inductive space curvature measuring sensitive element in the plane shape is L 0 The curvature θ of the bendable deformable object can be derived by the following formula:
2. a method of measuring the spatial curvature of a deformable curved surface as claimed in claim 1, wherein in the step 2, the screen plate is provided with meshes of a coil part of a circular type; in the step 3, the conductive coil formed on the surface of the bendable deformation object is a circle-shaped conductive coil.
3. A method of measuring the curvature in space of a deformable curved surface as claimed in claim 1, wherein in step 2, the screen plate is provided with meshes of rectangular coil portions; in the step 3, the conductive coil formed on the surface of the bendable deformation object is a rectangular conductive coil.
4. The method of measuring the spatial curvature of a deformable curved surface as claimed in claim 1, wherein in the step 3, the conductive powder is carbon ink, carbon-based conductive powder, or metal conductive powder.
5. A method for measuring the space curvature of a deformable curved surface is characterized by comprising the following steps:
step 1, manufacturing a screen printing plate, wherein the screen printing plate is provided with meshes of a coil part;
step 2, preparing a first flexible film;
step 3, clinging the screen printing plate to a first flexible film, coating a layer of conductive powder on the screen printing plate, extruding the conductive powder by using a scraper, printing the conductive powder on the first flexible film to form a conductive coil, connecting an interface lead at one end of the conductive coil, and connecting an interface lead at the other end of the conductive coil;
step 4, preparing a second flexible film, and forming two lead holes in the second flexible film;
step 5, covering a second flexible film on the first flexible film, respectively leading out two interface leads from two lead holes, and adhering the second flexible film and the first flexible film together by using an adhesive;
step 6, fixing the first flexible film on the surface of the bendable and deformable object;
and 7, measuring the inductance value of the conductive coil when the bendable deformable object is bent and deformed, and calculating the curvature of the bendable deformable object according to the inductance value of the conductive coil.
6. A method of measuring the spatial curvature of a deformable curved surface as claimed in claim 5, wherein the flexible film is a polyimide film or a polyamide film.
7. A method of measuring the curvature in space of a deformable curved surface as claimed in claim 5, wherein in step 1, the screen plate is provided with meshes of a coil portion of a circular type; in the step 3, the formed conductive coil is a circle-shaped conductive coil.
8. A method of measuring the spatial curvature of a deformable curved surface as claimed in claim 5, wherein in the step 1, the screen plate is provided with meshes of rectangular coil portions; in the step 3, the formed conductive coil is a rectangular conductive coil.
9. The method of measuring the spatial curvature of a deformable curved surface as claimed in claim 5, wherein in the step 3, the conductive powder is carbon ink, carbon-based conductive powder, or metal conductive powder.
10. A manufacturing method of an inductive space curvature measurement sensitive element is characterized by comprising the following steps:
step 1, manufacturing a screen printing plate, wherein the screen printing plate is provided with meshes of a coil part;
step 2, preparing a first flexible film;
step 3, tightly attaching the screen printing plate to a first flexible film, coating a layer of conductive powder on the screen printing plate, extruding the conductive powder by using a scraper, printing the conductive powder on the first flexible film to form a conductive coil, connecting an interface lead at one end of the conductive coil, and connecting an interface lead at the other end of the conductive coil;
step 4, preparing a second flexible film, and forming two lead holes in the second flexible film;
and 5, covering the second flexible film on the first flexible film, respectively leading the two interface leads out of the two lead holes, and adhering the second flexible film and the first flexible film together by using an adhesive.
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