阅读说明：本技术 自供电压力传感器垫及其加工方法以及出入口监视装置 (Self-powered pressure sensor pad, processing method thereof and entrance and exit monitoring device ) 是由 欧宗永 欧先润 宋建军 王寒 张康 于 2019-09-26 设计创作，主要内容包括：本发明公开了自供电压力传感器垫及其加工方法以及出入口监视装置,自供电压力传感器垫包括：至少两个压电片构成的压电片阵列、用于并联压电片阵列的顶部电极层、用于并联压电片阵列的底部电极层、用于电绝缘顶部电极层和底部电极层的镂空阵列分隔层。压电片包括导电基板、设于导电基板外表面上的压电陶瓷膜和线路或涂布于压电陶瓷膜上的导电层。顶部电极层和底部电极层分别层叠设于压电片阵列的两相对侧并分别与构成压电片阵列的导电层和导电基板形成良好欧姆接触。本发明所提供的自供电压力传感器垫在行人及轮椅行经时不易破裂,且将行人及轮椅行经时的机械能转换成电能,达到自发电的目的。(The invention discloses a self-powered pressure sensor pad, a processing method thereof and an entrance and exit monitoring device, wherein the self-powered pressure sensor pad comprises: the piezoelectric patch array comprises at least two piezoelectric patches, a top electrode layer for connecting the piezoelectric patch array in parallel, a bottom electrode layer for connecting the piezoelectric patch array in parallel, and a hollow array separation layer for electrically insulating the top electrode layer and the bottom electrode layer. The piezoelectric patch comprises a conductive substrate, a piezoelectric ceramic film arranged on the outer surface of the conductive substrate, and a circuit or a conductive layer coated on the piezoelectric ceramic film. The top electrode layer and the bottom electrode layer are respectively stacked on two opposite sides of the piezoelectric sheet array and respectively form good ohmic contact with the conductive layer and the conductive substrate which form the piezoelectric sheet array. The self-powered pressure sensor mat provided by the invention is not easy to break when a pedestrian and a wheelchair pass through, and converts mechanical energy of the pedestrian and the wheelchair during passing into electric energy, thereby achieving the purpose of self-power generation.)

1. A self-powered pressure sensor mat, comprising:

at least two piezoelectric sheets to form a piezoelectric sheet array;

a top electrode layer for connecting the piezoelectric patch array in parallel;

a bottom electrode layer for connecting the piezoelectric sheet arrays in parallel;

a hollowed array spacer layer for electrically insulating said top electrode layer from said bottom electrode layer;

the piezoelectric patches comprise a conductive substrate, a piezoelectric ceramic film and a circuit which are arranged on the outer surface of the conductive substrate or a conductive layer coated on the piezoelectric ceramic film, and the top electrode layer and the bottom electrode layer are respectively stacked on two opposite sides of the piezoelectric patch array and respectively form ohmic contact with the conductive layer and the conductive substrate which form the piezoelectric patch array.

2. The self-powered pressure sensor mat of claim 1, wherein the piezoelectric ceramic membrane is disposed on a side of the conductive substrate proximate the top electrode layer.

3. The self-powered pressure sensor mat of claim 1, wherein the conductive layer is one or more of silver, copper, nickel, or a conductive polymer, and the conductive layer is electrically insulated from the conductive substrate.

4. The self-powered pressure sensor mat of claim 1, wherein the top electrode layer and the bottom electrode layer are electrically connected by electrical leads and an energy harvesting module and a signal emitting module are electrically connected therebetween so as to trigger an alarm.

5. The self-powered pressure sensor mat of claim 1, wherein the conductive substrate is made of a conductive material that is at least one of copper, brass, bronze, iron, stainless steel, nickel, chromium, aluminum, zinc, or an alloy.

6. The self-powered pressure sensor mat of claim 1, wherein the thickness of the piezoceramic membrane for the piezoelectric patch is 0.1mm to 2.0mm, and the area of the piezoceramic membrane for the piezoelectric patch is 70mm²-20000mm²。

7. The self-powered pressure sensor mat of claim 1, wherein the openwork array spacer layer is affixed to the array of piezoelectric patches and positioned between the top and bottom electrode layers to electrically isolate the top and bottom electrode layers, and wherein the conductive layer is exposed through the openwork area to electrically connect the conductive layer to the top electrode layer.

8. The self-powered pressure sensor mat of claim 7, wherein the openwork array spacer layer is a film or a sheet, and the material of the openwork array spacer layer is at least one of plastic, rubber, paper, and cloth.

9. The self-powered pressure sensor mat of claim 1, further comprising a top encapsulation layer disposed on a side of the top electrode layer facing away from the piezoelectric sheet and a bottom encapsulation layer disposed on a side of the bottom electrode layer facing away from the piezoelectric sheet.

10. A self-powered pressure sensor mat as in claim 1, further comprising an elastomer disposed between said top electrode layer and said top encapsulation layer, each said elastomer covering or conforming to a central region of said conductive layer on each said piezoelectric ceramic membrane, each said elastomer having an area less than or equal to an area of each said piezoelectric ceramic membrane, said elastomer configured to concentrate forces to enhance elastic deformation of said piezoelectric sheets.

11. The self-powered pressure sensor mat of claim 1, further comprising a deformable support layer disposed between the bottom electrode layer and the bottom encapsulation layer, the deformable support layer configured to enhance elastic deformation of the piezoelectric sheet, the deformable support layer being formed from one or more of 3D fabric, foamed sponge, foamed plastic, foamed rubber, fleece, and gauze.

12. The self-powered pressure sensor mat of claim 11, further comprising a bottom electrode support layer disposed between the deformable support layer and the bottom electrode layer, wherein the bottom electrode support layer is a film or sheet, and wherein the bottom electrode support layer is at least one of metal, plastic, rubber, paper, and cloth.

13. The self-powered pressure sensor mat of claim 1, wherein the sheet resistance of both the top electrode layer and the bottom electrode layer is less than 0.1 Ω/sq.

14. The self-powered pressure sensor mat of claim 1, wherein the top electrode layer lower surface and the bottom electrode layer upper surface are each provided with an array of piezoelectric patches.

15. The self-powered pressure sensor mat of claim 1, wherein one or both sides of the top electrode layer and the bottom electrode layer are provided with a trace or a coated conductive adhesive for electrical connection with the piezoelectric sheet, the conductive adhesive being at least one of an organic adhesive film mixed with metal particles or metal fibers, a conductive resin adhesive, and a carbon-based conductive adhesive.

16. The self-powered pressure sensor mat of claim 1, wherein a plurality of the piezoelectric patches are divided into a plurality of cells, each cell comprising piezoelectric patches connected in parallel, in series, or both to form the array of piezoelectric patches.

17. The self-powered pressure sensor mat of claim 1, wherein a plurality of the piezoelectric sheets are arranged in a single layer or a multi-layer stack.

18. A self-powered pressure sensor mat as defined in claim 1, wherein said piezoelectric ceramic film of said piezoelectric sheet is an inorganic piezoelectric ceramic material and is at least one of a lead zirconate titanate-based, barium titanate-based, sodium bismuth titanate-based, sodium niobate-based, potassium niobate-based, bismuth layered material.

19. The processing method of the self-powered pressure sensor is characterized by comprising the following steps of:

manufacturing a conductive substrate;

covering a piezoelectric ceramic film on the conductive substrate;

forming a piezoelectric sheet by wiring or coating a conductive layer on the piezoelectric ceramic film;

fixing a conductive substrate on a bottom electrode layer by a piezoelectric sheet array formed by at least two piezoelectric sheets through a circuit or coated conductive adhesive to form good ohmic contact, wherein the back surface of the bottom electrode layer can be supported by a bottom electrode supporting layer;

fixing the hollow array separation layer on the piezoelectric sheet array, and exposing the conducting layer through the hollow area;

fixing a top electrode layer on the hollow array separation layer, and adhering the exposed conductive layer and the top electrode layer through a conductive adhesive to form good ohmic contact;

covering and attaching an elastomer above the top electrode layer and opposite to the center of the piezoelectric ceramic membrane to form an elastomer array consistent with the piezoelectric sheet array;

a deformable supporting layer is attached below the bottom electrode supporting layer;

electrical leads leading out of the top electrode layer and electrical leads out of the bottom electrode layer;

the structure is packaged and the electric leads, the energy collecting module and the signal transmitting module are electrically connected.

20. An doorway monitoring apparatus comprising a self-powered pressure sensor mat according to any one of claims 1 to 18 and a controller wired or wirelessly connected to the self-powered pressure sensor mat.

Technical Field

The invention relates to the field of sensor pads, in particular to a self-powered pressure sensor pad, a processing method thereof and an entrance and exit monitoring device.

Background

Entrance/exit monitoring systems are used in hospitals, nursing homes, retirement centers, and other locations to alert personnel when a person enters/leaves a room. A typical inlet/outlet monitoring system includes a pressure sensor mat and a controller for receiving signals from the sensor mat. The sensor mat connected to the controller typically has a power source such as a battery or mains, and the signal sent by the sensor mat to the controller may reflect pressure changes on the sensor mat. The controller typically has a power switch and a visual and audible alarm that is sounded when the signal is received. The connection between the controller and the sensor pad may be a hard-wired or wireless connection.

A typical pressure sensor pad is an active device that requires a power source to emit a signal when pressed. Typical active materials for pressure sensing of the sensor pad include electrical materials with resistance sensitive to pressure, or electrical materials with capacitance sensitive to pressure, and optical materials with light refraction/transmission patterns sensitive to pressure. These materials change their electrical/optical properties when pressure is applied, and the change in pressure can be reflected by electrical/optical signals passing through them. One drawback of these active devices is that they require a power source, making the system bulky and requiring frequent maintenance, such as replacing a battery if it is used as a power source. In addition, the pressure sensor mat is difficult to completely encapsulate due to the battery case and the need to replace the battery, and the circuitry and active materials of the sensor mat are inevitably attacked by moisture or oxidizing gases, which all affect the reliability of the system.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a self-powered pressure sensor pad which has better reliability and can realize wireless signal transmission.

One of the purposes of the invention is realized by adopting the following technical scheme:

a self-powered pressure sensor mat comprising:

at least two piezoelectric sheets to form a piezoelectric sheet array;

a top electrode layer for connecting the piezoelectric patch array in parallel;

a bottom electrode layer for connecting the piezoelectric sheet arrays in parallel;

a hollowed array spacer layer for electrically insulating said top electrode layer from said bottom electrode layer;

the piezoelectric patches comprise a conductive substrate, a piezoelectric ceramic film and a circuit which are arranged on the outer surface of the conductive substrate or a conductive layer coated on the piezoelectric ceramic film, and the top electrode layer and the bottom electrode layer are respectively stacked on two opposite sides of the piezoelectric patch array and respectively form ohmic contact with the conductive layer and the conductive substrate which form the piezoelectric patch array.

Further, the piezoelectric ceramic film is arranged on one side, close to the top electrode layer, of the conductive substrate.

Further, the conductive layer is one or more of silver, copper, nickel, or a conductive polymer, and the conductive layer is electrically insulated from the conductive substrate.

Further, the top electrode layer and the bottom electrode layer are connected through an electric lead, and an energy collecting module and a signal transmitting module are electrically connected between the top electrode layer and the bottom electrode layer, so that an alarm is triggered to give an alarm.

Further, the conductive substrate is made of a conductive material, and the conductive material is at least one of copper, brass, bronze, iron, stainless steel, nickel, chromium, aluminum and zinc or an alloy.

Further, the method can be used for preparing a novel materialThe thickness of the piezoelectric ceramic membrane for the piezoelectric sheet is 0.1mm-2.0mm, and the area of the piezoelectric ceramic membrane for the piezoelectric sheet is 70mm²-20000mm²。

Further, the hollow array separation layer is fixed on the piezoelectric patch array and located between the top electrode layer and the bottom electrode layer to electrically insulate the top electrode layer and the bottom electrode layer, and the conductive layer is exposed through the hollow area so as to be electrically connected with the top electrode layer.

Further, the hollow array separation layer is a film or a plate, and the material of the hollow array separation layer is at least one of plastic, rubber, paper and cloth.

Further, the self-powered pressure sensor pad further comprises a top encapsulation layer arranged on one side of the top electrode layer, which is far away from the piezoelectric sheet, and a bottom encapsulation layer arranged on one side of the bottom electrode layer, which is far away from the piezoelectric sheet.

Furthermore, the self-powered pressure sensor pad further comprises elastic bodies arranged between the top electrode layer and the top packaging layer, each elastic body covers or is attached to a central area of the conductive layer on each piezoelectric ceramic membrane, the area of each elastic body is smaller than or equal to that of each piezoelectric ceramic membrane, and the elastic bodies are used for intensively bearing force to enhance the elastic deformation of the piezoelectric sheets.

Further, the self-powered pressure sensor pad further comprises a deformable support layer arranged between the bottom electrode layer and the bottom packaging layer, the deformable support layer is used for enhancing elastic deformation of the piezoelectric sheet, and the material of the deformable support layer is one or more of 3D fabric, foamed sponge, foamed plastic, foamed rubber, flannelette and gauze.

Further, the self-powered pressure sensor pad may further include a bottom electrode support layer disposed between the deformable support layer and the bottom electrode layer, where the bottom electrode support layer is a film or a plate, and the bottom electrode support layer is made of at least one of metal, plastic, rubber, paper, and cloth.

Further, the sheet resistance of both the top electrode layer and the bottom electrode layer is less than 0.1 Ω/sq.

Furthermore, the lower surface of the top electrode layer and the upper surface of the bottom electrode layer are both provided with piezoelectric sheet arrays.

Furthermore, one side or two sides of the top electrode layer and the bottom electrode layer are provided with a circuit or coated conductive adhesive to be electrically connected with the piezoelectric sheet, and the conductive adhesive is at least one of an organic adhesive film mixed with metal particles or metal fibers, a conductive resin adhesive and a carbon-based conductive adhesive.

Further, the plurality of piezoelectric sheets are divided into a plurality of units, and the piezoelectric sheets contained in each unit are connected in parallel, in series or in parallel and in series to form the piezoelectric sheet array.

Further, a plurality of the piezoelectric sheets are arranged in a single layer or a multilayer stack.

Further, the piezoelectric ceramic film of the piezoelectric sheet is an inorganic piezoelectric ceramic material, and is at least one of a lead zirconate titanate-based, barium titanate-based, sodium bismuth titanate-based, sodium niobate-based, potassium niobate-based, and bismuth layered material.

The invention also provides a processing method of the self-powered pressure sensor, which comprises the following steps:

manufacturing a conductive substrate;

covering a piezoelectric ceramic film on the conductive substrate;

forming a piezoelectric sheet by wiring or coating a conductive layer on the piezoelectric ceramic film;

fixing a conductive substrate on a bottom electrode layer by a piezoelectric sheet array formed by at least two piezoelectric sheets through a circuit or coated conductive adhesive to form good ohmic contact, wherein the back surface of the bottom electrode layer can be supported by a bottom electrode supporting layer;

fixing the hollow array separation layer on the piezoelectric sheet array, and exposing the conducting layer through the hollow area;

fixing a top electrode layer on the hollow array separation layer, and adhering the exposed conductive layer and the top electrode layer through a conductive adhesive to form good ohmic contact;

covering and attaching an elastomer above the top electrode layer and opposite to the center of the piezoelectric ceramic membrane to form an elastomer array consistent with the piezoelectric sheet array;

a deformable supporting layer is attached below the bottom electrode supporting layer;

electrical leads leading out of the top electrode layer and electrical leads out of the bottom electrode layer;

the structure is packaged and the electric leads, the energy collecting module and the signal transmitting module are electrically connected.

The invention also provides an entrance and exit monitoring device, which comprises the self-powered pressure sensor pad and a controller which is in wired or wireless connection with the self-powered pressure sensor pad.

Compared with the prior art, the invention has the beneficial effects that: the piezoelectric sheet array unit formed by the piezoelectric sheets achieves the purpose of parallel connection through the top electrode layer, the hollow array separation layer for electrically insulating the top electrode layer and the bottom electrode layer, and the elastic deformation of the piezoelectric sheets is enhanced through the elastic body and the deformable support layer, so that the spontaneous electric power is increased. The self-powered pressure sensor mat provided by the invention is not easy to break when a pedestrian and a wheelchair pass through, and converts mechanical energy of the pedestrian and the wheelchair during passing into electric energy, so that the purpose of self-power generation is achieved without battery power supply. The self-powered pressure sensor pad can be completely packaged, so that the deterioration of the piezoelectric sheet and the electrode layer is reduced, and the reliability of the moisture-proof device is improved. The sensor pad has compact structure and smaller total thickness.

Drawings

FIG. 1 is a cross-sectional view of one side of a self-powered pressure sensor mat provided in accordance with an embodiment of the present invention;

FIG. 2 is a cross-sectional view of one side of a piezoelectric patch in accordance with an embodiment of the present invention;

FIG. 3 is a top view of a self-powered pressure sensor provided by an embodiment of the present invention;

figure 4 is a cross-sectional view of another side of a self-powered pressure sensor provided by an embodiment of the present invention.

In the figure:

100. a self-powered pressure sensor pad; 11. a bottom encapsulation layer; 12. a deformable support layer; 13. a bottom electrode support layer; 14. a bottom electrode layer; 141. a conductive substrate; 15. a piezoelectric sheet; 151. a piezoelectric ceramic film; 16. hollowing out the array spacer layer; 171. a conductive layer; 17. a top electrode layer; 18. an elastomer; 19. and a top encapsulation layer.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that any combination of the embodiments or technical features described below can be used to form a new embodiment without conflict.

It should be noted that all the directional indications (such as upper, lower, left, right, front, back, top and bottom … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components in a specific posture (as shown in the figure), and if the specific posture is changed, the directional indication is changed accordingly.

It will also be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Referring to fig. 1 and 2, the present invention provides a self-powered pressure sensor mat 100 comprising: the piezoelectric device comprises a piezoelectric sheet array consisting of at least two piezoelectric sheets 15, a top electrode layer 17 and a bottom electrode layer 14, wherein the top electrode layer 17 and the bottom electrode layer 14 are respectively laminated on two opposite sides of a conductive layer 171 and a conductive substrate 141 of the piezoelectric sheet array and respectively form good ohmic contact, and each piezoelectric sheet 15 comprises a conductive substrate 141, a piezoelectric ceramic film 151 arranged on the outer surface of the conductive substrate 141, and a conductive layer 171 which is a circuit or coated on the piezoelectric ceramic film 151.

All the piezoelectric sheets 15 are laid flat, and the piezoelectric sheets 15 may be circular, square, rectangular or any other shape, and are preferably circular. The conductive substrate 141 functions to provide support for the piezoelectric ceramic film 151 and to be electrically connected to the piezoelectric ceramic film 151 to conduct electricity generated in the piezoelectric ceramic film 151.

The top electrode layer 17 and the bottom electrode layer 14 are made of a conductive material, such as at least one of metal strips, metal foils, metal wires, conductive fabrics, or printed conductive ink on a flexible substrate, the sheet resistance of each of the top electrode layer 17 and the bottom electrode layer 14 is less than 0.1 Ω/sq, and each of the top electrode layer 17 and the bottom electrode layer 14 is connected in parallel with the array of piezoelectric patches so as to have high power and low loss spontaneous output. Both the top electrode layer 17 and the bottom electrode layer 14 have conductive glue of the wiring on one or both sides.

Preferably, the top electrode layer 17 and the bottom electrode layer 14 are conductive fabrics.

The piezoelectric sheet 15 comprises a plurality of sheets, and in order to reduce power losses in the circuit, the connection of each individual piezoelectric sheet 15 should be optimized, preferably by connecting all the sheets 15 in parallel to form small cells, and then connecting the cells in series, in parallel, and in combinations of series and parallel. Fig. 4 is a simplified diagram showing the connection relationship between the plurality of piezoelectric sheets 15.

It is preferred to divide the sensor into several separate areas and to convert the instantaneous current generated by the mechanical action of each area into a direct current by the energy harvesting module, since in some applications, particularly for applications involving large area sensor pads, the currents generated from different areas may be out of phase, causing mutual interference or cancellation, which can reduce or eliminate the above and improve the energy harvesting efficiency.

Preferably, the piezoelectric ceramic film 151 is preferably at least one of a lead zirconate titanate-based, barium titanate-based, sodium bismuth titanate-based, sodium niobate-based, potassium niobate-based, and bismuth layer structure.

A high-efficiency energy collecting module (not shown) and a signal transmitting module (not shown) are electrically connected between the top electrode layer 17 and the bottom electrode layer 14, and preferably, the signal transmitting module is a wireless signal transmitting module.

Preferably, the top electrode layer 17 has good ohmic contact with the piezoelectric sheet conductive layer 171.

The conductive layer 171 functions to reduce the contact resistance between the piezoelectric ceramic film 151 and the top electrode layer 17, and the conductive layer 171 includes one or more of silver, copper, nickel, or conductive polymer (PEDOT: PSS), and may be formed by a vacuum deposition method such as evaporation deposition or by directly wiring or coating a conductive paint on the top of the piezoelectric ceramic film 151.

Preferably, the conductive substrate 141 is made of a conductive material. The conductive material is at least one of copper, brass, bronze, iron, stainless steel, nickel, chromium, aluminum and zinc or alloy. The conductive substrate 141 has good ohmic contact with the bottom electrode layer 14.

Preferably, the thickness of the piezoelectric ceramic film 151 is 0.1mm to 2.0 mm. Preferably, the area of the piezoelectric ceramic is 70mm²-20000mm²。

Preferably, the self-powered pressure sensor pad further comprises a hollow array spacer layer 16, wherein the hollow array spacer layer 16 is fixed on the array of piezoelectric patches 15 and located between the top electrode layer 17 and the bottom electrode layer 14 to electrically isolate the top electrode layer 17 and the bottom electrode layer 14, and the conductive layer 171 is exposed through the hollow area.

Referring to fig. 1, the cut-out array spacer layer 16 provides electrical isolation between the top electrode layer 17 and the bottom electrode layer 14 to avoid short circuits, and it is understood that the cut-out array spacer layer 16 is made of an insulating material, such as a transparent PVC film, an EVA film.

Preferably, the hollow array spacer layer 16 is formed with a through hole to expose the conductive layer 171 through the through hole.

Preferably, the self-powered pressure sensor mat 100 further comprises a top encapsulation layer 19 provided on a side of the top electrode layer 17 facing away from the piezoelectric patches 15 and a bottom encapsulation layer 11 provided on a side of the bottom electrode layer 14 facing away from the piezoelectric patches 15.

The bottom and top encapsulation layers 11, 19 are used to encapsulate the self-powered pressure sensor mat 100 to reduce degradation of the circuitry and active materials or other layers, and the bottom and top encapsulation layers 11, 19 may each be made of polyvinyl chloride (PVC), Ethylene Vinyl Acetate (EVA), thermoplastic polyurethane elastomer (TPU), or other commonly used encapsulation materials, or both may be made of different materials.

Preferably, the self-powered pressure sensor mat 100 further comprises an elastomer 18 disposed between the top electrode layer 17 and the top encapsulation layer 19; and/or the presence of a gas in the gas,

the self-powered pressure sensor mat 100 further comprises a deformable support layer 12 disposed between a bottom electrode layer 14 and the bottom encapsulation layer 11.

Preferably, the self-powered pressure sensor mat 100 may also include a bottom electrode support layer 13 disposed between the deformable support layer 12 and the bottom electrode layer 14.

The elastomer 18, which is used to concentrate the force to enhance the elastic deformation of the piezoelectric sheet, is disposed near the top encapsulation layer 19, is generally circular, is aligned with the center of the piezoelectric sheet 15, and has a diameter no greater than the diameter of the piezoelectric ceramic film 151. The deformable support layer 12 is easy to deform when being pressed and is used for enhancing the elastic deformation of the piezoelectric sheet so as to increase the electric energy output, and the deformable support layer 12 can be thin soft sponge or 3D fabric with openings. When a conductive material is used as the bottom electrode support layer, it should be electrically insulated from the top electrode layer. The bottom electrode support layer 13 is typically a plastic sheet and the supporting plastic layer 13 provides mechanical support for the bottom electrode layer 14, the bottom electrode support layer 13 not being necessary if the bottom electrode layer 14 itself has good mechanical strength.

The invention also provides a processing method of the self-powered pressure sensor pad, which is used for manufacturing the self-powered pressure sensor pad, and comprises the following steps:

manufacturing a conductive substrate 141;

covering a piezoelectric ceramic film 151 on the conductive substrate 141;

wiring or coating a conductive layer 171 on the piezoelectric ceramic film to form the piezoelectric sheet 15;

fixing a conductive substrate 141 on a bottom electrode layer 14 by an array formed by at least two piezoelectric sheets 15 through a wired or coated conductive adhesive to form a good ohmic contact, wherein the back surface of the bottom electrode layer 14 can be supported by a bottom electrode supporting layer 13;

fixing the hollow array separation layer 16 on the array of piezoelectric patches 15, and exposing the conductive layer 171 through the hollow area;

fixing a top electrode layer 17 on the hollow array separation layer 16, and adhering the exposed conductive layer 171 and the top electrode layer 17 through a conductive adhesive to form a good ohmic contact;

covering and attaching an elastic body 18 above the top electrode layer 17 and opposite to the center of the piezoelectric ceramic film to form an elastic body 18 array consistent with the piezoelectric sheet array;

a deformable support layer 12 is attached below the bottom electrode support layer 13;

electrical leads leading out of the top electrode layer 17 and electrical leads of the bottom electrode layer 14;

the structure is packaged and the electric leads, the energy collecting module and the signal transmitting module are electrically connected.

There is also provided an access port monitoring device comprising a self-powered pressure sensor mat as described above and a controller wired or wirelessly connected to the self-powered pressure sensor mat. The doorway monitoring apparatus further includes an alarm electrically connected to the controller.

In summary, the self-powered pressure sensor mat 100 provided by the present invention uses a piezoelectric ceramic material as an active material, and is supplemented with a specially designed sensor mat structure, an energy collector module and a signal transmission module to generate a high power output, and the generated energy can provide power for wireless signal transmission, thereby realizing the self-powered pressure sensor mat 100 without an external power supply, and the energy collector module and the signal transmission module without a battery for power supply. . Furthermore, other materials besides self-powered pressure sensor mat 100 have high flexibility and can be folded. Moreover, since the self-powered pressure sensor mat 100 is self-powered and requires no batteries, the self-powered pressure sensor mat 100 can be completely packaged, reducing degradation of circuitry and active materials (piezoelectric ceramic membranes) and improving reliability and chemical degradation of the moisture barrier, and finally, the self-powered pressure sensor mat 100 provided by the present invention is also compact, with a total thickness of less than 5 mm.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.