阅读说明：本技术 一种曲率传感系统及其控制方法 (curvature sensing system and control method thereof ) 是由 唐伟 王中林 舒生 于 2019-11-25 设计创作，主要内容包括：本发明实施例提供一种曲率传感系统及其控制方法,该系统包括：阵列部、测量部；所述阵列部包括：阵列的N个阵列单元及其对应的排线,其中N为正整数；所述阵列单元包括：上压电薄膜、下压电薄膜以及设置于所述上压电薄膜与所述下压电薄膜之间的柔性薄膜；所述排线用于将所述上压电薄膜、所述下压电薄膜在受到挤压时产生的电压组传输到所述测量部；所述测量部包括：多通道测试仪,用于接收所述排线传输的电压组；并利用所述电压组与预设曲率库进行比对,得到所述压电薄膜所处位置的曲率值；将所述曲率值发送到外界设备进行显示；其中,所述预设曲率库存有预设曲率值与预设电压组的对应关系,适用于人体可穿戴或者变自由度的测量。(The embodiment of the invention provides curvature sensing systems and a control method thereof, the system comprises an array part and a measurement part, wherein the array part comprises N array units of an array and corresponding flat cables, N is a positive integer, the array units comprise an upper piezoelectric film, a lower piezoelectric film and a flexible film arranged between the upper piezoelectric film and the lower piezoelectric film, the flat cables are used for transmitting voltage groups generated when the upper piezoelectric film and the lower piezoelectric film are squeezed to the measurement part, the measurement part comprises a multi-channel tester used for receiving the voltage groups transmitted by the flat cables, obtaining a curvature value of the position of the piezoelectric film by comparing the voltage groups with a preset curvature library, and transmitting the curvature value to an external device for display, wherein the preset curvature library is preset with a corresponding relation between the curvature value and the preset voltage group, and is suitable for measurement of human body wearable or variable degree of freedom.)

The curvature sensing system of kinds is characterized by comprising an array part and a measuring part;

the array section includes: n array units of the array and corresponding flat cables thereof, wherein N is a positive integer;

the array unit includes: the flexible thin film is arranged between the upper piezoelectric thin film and the lower piezoelectric thin film; the flat cable is used for transmitting a voltage group generated when the upper piezoelectric film and the lower piezoelectric film are squeezed to the measuring part;

the measurement section includes: the multi-channel tester is used for receiving the voltage group transmitted by the flat cable; comparing the voltage group with a preset curvature library to obtain a curvature value of the position of the piezoelectric film; sending the curvature value to external equipment for display; and the preset curvature library stores the corresponding relation between a preset curvature value and a preset voltage group.

2. The curvature sensing system of claim 1,

the flat cable comprises more than corresponding bent printed circuit boards;

and the circuit board is printed with electrode wires corresponding to the shape of the printed circuit board.

3. The curvature sensing system of claim 1,

the piezoelectric films in the array unit are regularly arranged in small blocks of polarized piezoelectric films;

the upper and lower surfaces of the piezoelectric film are respectively coated with conductive layers, and the upper and lower surfaces are respectively attached with a printed circuit board with electrode wires.

4. The curvature sensing system of claim 3,

the conductive layer is coated on the middle part of the piezoelectric film so as to be insulated from the edge part of the piezoelectric film;

the piezoelectric film comprises an upper piezoelectric film and a lower piezoelectric film.

5. The curvature sensing system of claim 4,

the upper piezoelectric film and the lower piezoelectric film are aligned along the conductive layer;

the flexible membrane is aligned along the piezoelectric membrane edge.

6. The curvature sensing system of claim 1,

the upper piezoelectric film and the lower piezoelectric film are the same in size and shape and are aligned and superposed;

the size and the arrangement of the flexible thin film are the same as those of the upper piezoelectric thin film and the lower piezoelectric thin film;

the thickness of the flexible film is simultaneously larger than the thickness of the upper piezoelectric film and the thickness of the lower piezoelectric film.

7. The curvature sensing system of claim 1,

the multichannel tester is also used for numbering voltage groups input by the flat cable so as to distinguish different array units.

8. The curvature sensing system of claim 1,

the flexible film is double-sided tape adhesive and is used for adhering the upper piezoelectric film and the lower piezoelectric film which are adhered to the flexible film;

the array part is packaged by flexible silicon rubber materials.

9. The curvature sensing system of any of claims 1 to 8,

the measuring part is also used for subtracting the voltage signals output by each groups of array units to obtain voltage difference values, storing the obtained voltage difference values and displaying the voltage difference values with different sizes on a display screen through different colors.

10, curvature sensing system control method applied to the curvature sensing system of any of claims 1 to 9 or , comprising:

when the upper piezoelectric film and the lower piezoelectric film are squeezed, transmitting a voltage group to the measuring part;

the measuring part receives the voltage group transmitted by the flat cable; comparing the voltage group with a preset curvature library to obtain a curvature value of the position of the piezoelectric film; sending the curvature value to external equipment for display; and the preset curvature library stores the corresponding relation between a preset curvature value and a preset voltage group.

Technical Field

The embodiment of the invention relates to the technical field of sensing, in particular to an curvature sensing system and a control method thereof.

Background

The curvature is which is an important geometric parameter in the manufacturing industry of machinery, instruments and electronic products in the modern industrial technology, the accuracy of the curvature directly influences the quality and the service life of the products, so that the curvature measurement plays an important role in the modern industry.

The curvature sensor is used to obtain the corner signal by the sensor, and then the corner signal is converted into the circuit parameter, and then the circuit parameter is converted into the electric signal to be output by the conversion circuit, along with the development of the microprocessor and the integrated chip, the processing of the output signal is improved day by day, the function is increasingly powerful, and the output signal can be directly displayed, printed, recorded, stored or supplied to a control system to complete the measurement or control function.

The curvature sensors are classified into a potential type curvature sensor, a resistance strain type curvature sensor, a grating type curvature sensor, a magnetic grating type curvature sensor, an induction synchronizer, a code wheel type curvature sensor and the like.

Mechanical and electromagnetic curvature sensors have been developed more and more, but have limited accuracy due to limitations of principles and processing means. In recent years, research and application of angle measurement technology are mostly seeking breakthrough in the field of photoelectric technology.

In the field of high-precision angle measurement, generally uses a high-density grating, a laser interference measurement and other optical principle-based measurement methods such as a laser self-alidade, but the high-precision devices generally have complex mechanisms and high cost, and are difficult to push to popularize because the characteristics of grating density, non-parallelism of optical elements, roughness and the like are difficult to improve under the existing processing conditions.

some non-commercial flexible curvature measuring sensors are also available, but is generally limited to a single degree of freedom, and the signal-to-noise ratio is small, and the measurement accuracy is not high.

Disclosure of Invention

Therefore, the embodiment of the present invention provides curvature measurement solutions, which can solve the above-mentioned or more technical problems.

In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:

, embodiments of the present invention provide curvature sensing systems, including an array portion, a measurement portion;

the array section includes: n array units of the array and corresponding flat cables thereof, wherein N is a positive integer;

the array unit includes: the flexible thin film is arranged between the upper piezoelectric thin film and the lower piezoelectric thin film; the flat cable is used for transmitting a voltage group generated when the upper piezoelectric film and the lower piezoelectric film are squeezed to the measuring part;

the measurement section includes: the multi-channel tester is used for receiving the voltage group transmitted by the flat cable; comparing the voltage group with a preset curvature library to obtain a curvature value of the position of the piezoelectric film; sending the curvature value to external equipment for display; and the preset curvature library stores the corresponding relation between a preset curvature value and a preset voltage group.

Preferably, the flat cable includes or more corresponding curved printed circuit boards;

and the circuit board is printed with electrode wires corresponding to the shape of the printed circuit board.

Preferably, the piezoelectric films in the array unit are arranged regularly in small blocks of polarized piezoelectric films;

the upper and lower surfaces of the piezoelectric film are respectively coated with conductive layers, and the upper and lower surfaces are respectively attached with a printed circuit board with electrode wires.

Preferably, the conductive layer is coated on a middle portion of the piezoelectric film to be insulated from an edge portion of the piezoelectric film;

the piezoelectric film comprises an upper piezoelectric film and a lower piezoelectric film.

Preferably, the upper piezoelectric film and the lower piezoelectric film are aligned along the conductive layer;

the flexible membrane is aligned along the piezoelectric membrane edge.

Preferably, the size and the shape of the upper piezoelectric film and the lower piezoelectric film are the same, and the upper piezoelectric film and the lower piezoelectric film are aligned and superposed;

the size and the arrangement of the flexible thin film are the same as those of the upper piezoelectric thin film and the lower piezoelectric thin film;

the thickness of the flexible film is simultaneously larger than the thickness of the upper piezoelectric film and the thickness of the lower piezoelectric film.

Preferably, the multichannel tester is further configured to number the voltage groups input to the flat cable to distinguish different array units.

Preferably, the flexible film is double-sided tape adhesive and is used for adhering the upper piezoelectric film and the lower piezoelectric film which are adhered to the flexible film;

the array part is packaged by flexible silicon rubber materials.

Preferably, the measuring part is further configured to subtract the voltage signals output by each groups of array units to obtain voltage difference values, store the obtained voltage difference values, and display the voltage difference values with different sizes on the display screen through different colors.

In a second aspect, an embodiment of the present invention provides methods for controlling a curvature sensing system, applied to the curvature sensing system described in any of the aforementioned , including:

when the upper piezoelectric film and the lower piezoelectric film are squeezed, transmitting a voltage group to the measuring part;

the measuring part receives the voltage group transmitted by the flat cable; comparing the voltage group with a preset curvature library to obtain a curvature value of the position of the piezoelectric film; sending the curvature value to external equipment for display; and the preset curvature library stores the corresponding relation between a preset curvature value and a preset voltage group.

The embodiment of the invention provides curvature sensing systems which comprise an array part and a measuring part, wherein the array part comprises N array units of an array and corresponding flat cables, N is a positive integer, the array units comprise an upper piezoelectric film, a lower piezoelectric film and a flexible film arranged between the upper piezoelectric film and the lower piezoelectric film, the flat cables are used for transmitting voltage groups generated when the upper piezoelectric film and the lower piezoelectric film are squeezed to the measuring part, the measuring part comprises a multi-channel tester used for receiving the voltage groups transmitted by the flat cables, comparing the voltage groups with a preset curvature library to obtain a curvature value of the position of the piezoelectric film, and transmitting the curvature value to external equipment for displaying, the preset curvature library stores the corresponding relation between the preset curvature value and the preset voltage group, and the curvature sensing system can be suitable for measurement of human body wearable or variable freedom degree, and is high in signal to noise ratio and measurement precision.

The curvature sensing system control method provided by the embodiment of the invention is applied to the curvature sensing system described in any of the , and has the beneficial effects described above, which are not repeated in .

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

FIG. 1 is a schematic diagram of an curvature sensing system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of an array portion of curvature sensing systems according to an embodiment of the invention;

FIG. 3 is a schematic diagram of an array element of curvature sensing systems according to an embodiment of the invention;

FIG. 4 is a schematic illustration of the electrode wires of an curvature sensing system provided by an embodiment of the present invention;

fig. 5 is a flowchart of a curvature sensing system control method according to an embodiment of the present invention.

The drawings are identified below:

the array unit 11, the measurement unit 12, the electronic terminal 13, the array unit 21, the flat cable 22, the flexible film 31, the upper piezoelectric film 32, the lower piezoelectric film 33, the electrode layer 34, the electrode line 41, and the conductive fastening point 42.

Detailed Description

The embodiments of the present invention are described in terms of specific embodiments, and other advantages and capabilities of the present invention will become apparent to those skilled in the art from the disclosure herein, wherein the described embodiments are intended to be partial, rather than complete, embodiments of the present invention.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, fig. 1 is a schematic diagram of curvature sensing systems according to an embodiment of the present invention, fig. 2 is a schematic diagram of an array portion of curvature sensing systems according to an embodiment of the present invention, fig. 3 is a schematic diagram of an array unit of curvature sensing systems according to an embodiment of the present invention, and fig. 4 is a schematic diagram of an electrode line of curvature sensing systems according to an embodiment of the present invention.

In specific embodiments of the present invention, the curvature sensing system includes an array unit 11 and a measurement unit 12, where the array unit 11 includes N array units of an array and a corresponding flat cable, where N is a positive integer, the array unit 21 includes an upper piezoelectric film 32, a lower piezoelectric film 33, and a flexible film 31 disposed between the upper piezoelectric film 32 and the lower piezoelectric film 33, the flat cable is configured to transmit a voltage group generated when the upper piezoelectric film and the lower piezoelectric film are pressed to the measurement unit 12, the measurement unit 12 includes a multi-channel tester configured to receive the voltage group sent by the flat cable 22, compare the voltage group with a preset curvature library to obtain a curvature value of a position where the piezoelectric film is located, and send the curvature value to an external device for display, where the preset curvature library stores a corresponding relationship between the curvature value and a preset voltage group.

, in order to prevent the electrode wires from breaking when the array unit 21 is pressed, the electrode wires can be bent, and in the specific setting, the flat cable 22 can be set to include corresponding bent printed circuit boards on which the electrode wires corresponding to the shapes of the printed circuit boards are printed, and the bent electrode wires on the printed circuit boards can form the flat cable 22.

Further , the piezoelectric thin films in the array unit 21 may be arranged in small blocks of polarized piezoelectric thin films, the upper and lower surfaces of the piezoelectric thin films are coated with conductive layers respectively, and the upper and lower surfaces of the piezoelectric thin films are provided with printed circuit boards with electrode wires respectively, the conductive layers are coated on the middle portion of the piezoelectric thin films to be insulated from the edge portions of the piezoelectric thin films, the piezoelectric thin films include an upper piezoelectric thin film 32 and a lower piezoelectric thin film 33, thereby, the short circuit phenomenon can be avoided, the upper piezoelectric thin film 32 and the lower piezoelectric thin film 33 are aligned along the conductive layers, and the flexible thin film 31 is aligned along the edge portions of the piezoelectric thin films.

It is worth pointing out that the upper piezoelectric film 32 and the lower piezoelectric film 33 have the same size and shape, and are superposed in alignment; the size and arrangement of the flexible film 31 are the same as those of the upper piezoelectric film 32 and the lower piezoelectric film 33; the thickness of the flexible film 31 is larger than the thickness of the upper piezoelectric film 32 and the thickness of the lower piezoelectric film 33.

In addition, the multi-channel tester is also used for numbering the voltage groups input by the flat cable 22 so as to distinguish different array units 21. The flexible film 31 may be provided with double-sided tape for adhering the upper piezoelectric film 32 and the lower piezoelectric film 33 attached thereto, and the array part is encapsulated by a flexible silicone rubber material.

Finally, it should be noted that the measuring unit 12 is further configured to subtract the voltage signals output from each groups of array units 21 to obtain voltage difference values, store the voltage difference values, and display the voltage difference values with different sizes on the display screen through different colors.

In yet another embodiment of the present invention, the present embodiment provides a piezoelectric array flexible curvature sensor with multiple degrees of freedom, comprising a sensing array, i.e. an array part 11, a switching port, another end connected to a multi-channel signal collector, the signal collector synchronously connected to an electronic terminal 13 such as a mobile phone display, a piezoelectric array composed of a plurality of the above units, each array unit 21 being an independent body capable of transmitting an independent signal, the signal of each array unit representing the curvature of points, the graph drawn by the curvature of the continuous points representing the curvature of the area, all the electrode wires at the end of the circuit board being collected to form a flat cable 22, the whole being encapsulated by a flexible silicone rubber material, when the sensing unit is bent, the flexible film is a flexible film 31, the upper piezoelectric film 32 above the film is stretched, the lower piezoelectric film 33 below the film is compressed, the electrode layer 34 is attached to the piezoelectric material, the signal of the piezoelectric film is transmitted by the flexible printed circuit boards sandwiched from top to bottom, and the flexible printed circuit boards are provided with corresponding electrode wires 41 and.

When the piezoelectric array 2 is used, the piezoelectric array 2 is attached to a part to be measured (such as an elbow), the elbow bends to drive each array unit 3 to bend to different degrees, each upper piezoelectric films 32 and lower piezoelectric films 33 can generate voltage outputs, the voltages are transmitted to the measuring part 12 of the multi-channel signal collector through the electrode layer 34 of the flexible printed circuit to carry out synchronous data acquisition, the array units of the same group are subtracted through analysis of special software, the voltages are displayed on the display screen of the electronic equipment 13 in different colors, and a previous acquisition library is compared to obtain the actual curvature.

From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: the curvature sensor adopts a sandwich type array structure, can realize flexible multi-degree-of-freedom self-driven curvature measurement, and is particularly suitable for a wearable system. The measurement is accurate, uses portably, can be applicable to the measurement of human wearable or variable degree of freedom, and SNR, measurement accuracy are high.

Referring to fig. 5, fig. 5 is a flowchart illustrating a control method of the curvature sensing system according to an embodiment of the present invention.

The embodiment of the present invention provides curvature sensing system control methods, which are applied to the curvature sensing system according to the aforementioned any embodiment, and include:

when the upper piezoelectric film and the lower piezoelectric film are squeezed, transmitting a voltage group to the measuring part;

the measuring part receives the voltage group transmitted by the flat cable; comparing the voltage group with a preset curvature library to obtain a curvature value of the position of the piezoelectric film; sending the curvature value to external equipment for display; and the preset curvature library stores the corresponding relation between a preset curvature value and a preset voltage group.

Although the invention has been described in detail with respect to and its specific embodiment, it will be apparent to those skilled in the art that variations or modifications may be made thereto without departing from the spirit of the invention.