Graphene metal thin film sensor for sleep monitoring and application

Abstract

The application discloses a graphene metal thin film sensor for sleep monitoring, which comprises a sensor module, and a pressure sensing unit, wherein the material of a patterned sensitive layer of the pressure sensing unit is a graphene and metal mixed material; a sandwich layer, which comprises a body and a first hole body, and the pressure sensing unit is fixed on the body; a bottom plate, which is arranged on one side of a first surface of the sandwich layer, and a convex and a first groove are arranged on the same surface of the bottom plate, and the position and size of the convex are matched with the first hole body; a top plate, which is arranged on one side of a second surface of the sandwich layer, and the top plate is provided with a center hole and a first groove; an elastomer, which has opposite third and fourth surfaces, and the third surface is fixed on the first surface, and an end close to the fourth surface is inserted into the first groove, and the shape and size of the first groove are the same as those of the elastomer without elastic deformation; and a pressing block, which is fixed on the second surface of the sandwich layer and extends out through the center hole of the top plate. The application further discloses an application of the graphene metal thin film sensor for sleep monitoring.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sensors, in particular to a graphene metal film sensor for sleep monitoring and application. BACKGROUND

[0002] With the continuous improvement of people's health and quality of life, sleep monitoring, such as heartbeat, breathing, and sleeping posture, has become a demand for people to pursue a healthy life. Sensors have become one of the choices for sleep monitoring.

[0003] The core technology of the mainstream sensor products on the market at present mainly includes: 1) optical fiber sensor, which measures physical changes such as temperature and pressure to change the wavelength of light. Its disadvantages are: large size, and the need for optical signals, light sources, and light source generators. Once the circuit is damaged or the light source cannot propagate, the measurement signal cannot be recovered, the test cannot be completed, and the cost is high; complex structure, the need for two sets of sensors, temperature and pressure coupling; complicated calculation, the need to know 4 parameters of two groups of sensors and 2 monitoring quantities. 2) Piezoelectric sensor, which measures physical changes. Physical changes cause changes in the internal charge distribution of the material. Its disadvantages are: unable to measure static posture and static physical quantities; and large interference, easily affected by static electricity and other interference; the output signal is nonlinear, which is not conducive to later calculation and testing. 3) Smart bracelet-optical sensor, which uses light reflection to convert the pulsatile changes in blood light transmittance into an electrical signal, and then uses a certain algorithm to convert it into a heart rate. Its disadvantages are: the need for light irradiation and large interference, which belongs to secondary signal monitoring; using light reflection to convert the pulsatile changes in blood light transmittance into an electrical signal, and then using a certain algorithm to convert it into a heart rate; only blood heart rate can be measured, and it cannot meet the measurement of sleep posture and movement. 4) Heart rate measurement, similar to ECG (electrocardiogram), which uses the potential difference of the human body to detect heart rate. Its disadvantages are: the need to connect the human body to a conductor to form a current loop, which damages the human body and is not a healthy monitoring method, and requires invasion of the human body to complete the measurement. SUMMARY

[0004] Therefore, it is necessary to provide a new graphene metal film sensor for sleep monitoring and application to solve the problem that the traditional sensor is not suitable for sleep monitoring.

[0005] A graphene metal film sensor for sleep monitoring, comprising a sensor module, the sensor module comprising:

[0006] A pressure sensing unit, comprising in sequence: an insulating layer, a patterned sensitive layer, an electrode provided on the patterned sensitive layer, and a protective layer covering the part of the patterned sensitive layer not covered by the electrode, the material of the patterned sensitive layer being a mixture of graphene and metal.

[0007] A sandwich structure, comprising a body and a first hole body, the body comprising opposite first and second surfaces, the first hole body being disposed through the first and second surfaces, a pressure sensing unit being fixed on the first and second surfaces respectively in opposite positions;

[0008] A bottom plate disposed on one side of the first surface of the sandwich structure, a protrusion and a first groove being disposed on the same surface of the bottom plate, the protrusion being disposed outside the first groove, the protrusion being adapted in position and size to the first hole body;

[0009] A top plate disposed on one side of the second surface of the sandwich structure, the top plate being provided with a central hole and a second groove for accommodating the protrusion;

[0010] An elastic body having opposite third and fourth surfaces, the third surface being fixed on the first surface, one end close to the fourth surface being inserted into the first groove of the bottom plate, the first groove being the same in shape and size as the elastic body without elastic deformation;

[0011] A pressing block fixed on the second surface of the sandwich structure and extending out through the central hole of the top plate.

[0012] In one embodiment, an even number of pressure sensing units are disposed on the first and second surfaces respectively, and the pressure sensing units are symmetrically arranged.

[0013] In one embodiment, the depth of the first groove gradually increases from the edge of the bottom plate to the center of the bottom plate.

[0014] In one embodiment, the first groove is arched as a whole.

[0015] In one embodiment, the pressing block is in the shape of a spherical segment.

[0016] In one embodiment, four first hole bodies are arranged in central symmetry on the sandwich structure, four protrusions corresponding to the first hole bodies are disposed on the bottom plate, first horizontal and vertical thin arms are respectively formed between the horizontally and vertically adjacent first hole bodies, and second horizontal and vertical thin arms are respectively formed between the horizontally and vertically adjacent protrusions.

[0017] In one embodiment, the first groove is disposed on the second horizontal and vertical thin arms, the first groove is a cross-shaped first groove, and the elastic body is a cross-shaped elastic body.

[0018] In one of the embodiments, two of the pressure sensing units are respectively arranged on the first surface and the second surface of the interlayer, and the two pressure sensing units are symmetrically arranged at two ends of the first longitudinal thin arm.

[0019] In one of the embodiments, four of the pressure sensing units of the first surface and the second surface are connected as a Wheatstone bridge.

[0020] In one of the embodiments, the material of the interlayer is at least one of polyimide and polyester; and / or, the material of the bottom plate is at least one of polyimide and polyester; and / or, the material of the top plate is at least one of polyimide and polyester; and / or, the material of the pressure block is at least one of polyimide and polyester; and / or, the material of the elastic body is selected from rubber, preferably silicone rubber.

[0021] In one of the embodiments, a signal processing module is further included, which is electrically connected with the pressure sensing unit, and is used for converting the pressure signal of the pressure sensing unit into an electric signal.

[0022] In one of the embodiments, the sensor module is multiple, and the multiple sensor modules are arranged in an array and are respectively electrically connected with the signal processing module.

[0023] An application of the graphene metal thin film sensor for sleep monitoring in monitoring heartbeat, respiration or sleep posture.

[0024] A mattress, a quilt or a bed board containing the graphene metal thin film sensor for sleep monitoring.

[0025] The present application monitors the signal by the resistance grid deformation of the pressure sensing unit, which is a direct monitoring method, can improve the monitoring accuracy and sensitivity, avoids the error caused by electromagnetic interference and secondary signal conversion, and improves the precision of signal change. Since the measurement method only needs to measure the voltage output signal value caused by the resistance grid deformation, the monitoring is completed by judging the signal amplitude and period, and the specific numerical value is not needed, so the measurement form is simple and the measurement parameters are less. The method is simple, easy to implement, and low in cost, and does not need precise instruments and analysis methods. The graphene metal thin film sensor for sleep monitoring can simultaneously complete heartbeat, respiration rate, sleep posture and sleep movement direction measurement. BRIEF DESCRIPTION OF DRAWINGS

[0026] Fig. 1 The structural schematic view of the sensor module of one embodiment of the present application;

[0027] Fig. 2A schematic view of a composite layered structure with an elastic body and a pressure block according to an embodiment of the present application;

[0028] Fig. 3 A schematic view of a structure of a sandwich with a pressure sensing unit according to an embodiment of the present application;

[0029] Fig. 4 A schematic view of a structure of a graphene metal thin film sensor for sleep monitoring according to an embodiment of the present application;

[0030] Fig. 5 A schematic view of a structure of a sandwich according to an embodiment of the present application;

[0031] Fig. 6 A schematic view of a structure of a bottom plate according to an embodiment of the present application;

[0032] Fig. 7 A schematic view of a structure of an elastic body according to an embodiment of the present application;

[0033] Fig. 8 A schematic view of a structure of a top plate according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] In order to facilitate the understanding of the present application, a more complete understanding of the present application can be had by reference to the following description and the accompanying drawings, in which preferred embodiments of the present application are illustrated. The present application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.

[0035] It is to be understood that where the terms "fixed" or "connected" are used herein, they can be directly connected to or be indirectly connected via intervening elements. Where the terms "comprise" or "comprising" are used herein, they are used on the basis and precondition that there are no more elements other than those recited in the following description.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this description, the terms "and / or" includes any and all combinations of one or more of the associated listed items.

[0037] Referring to Figs. 1-3 The embodiment of the present application provides a graphene metal thin film sensor for sleep monitoring, which comprises a sensor module 100, wherein the sensor module 100 comprises:

[0038] a pressure sensing unit 110;

[0039] The interlayer 120 comprises a body and a first hole body 122, the body comprises opposite first and second surfaces, the first hole body 122 is arranged through the first and second surfaces, and the first and second surfaces of the body are respectively fixed with a pressure sensing unit 110 in opposite positions;

[0040] A bottom plate 130 is arranged on one side of the first surface of the interlayer 120, and a protrusion 132 and a first groove 134 are arranged on the same surface of the bottom plate 130, the protrusion 132 is arranged outside the first groove 134, and the position and size of the protrusion 132 are matched with the first hole body 122;

[0041] A top plate 140 is arranged on one side of the second surface of the interlayer 120, the top plate 140 is provided with a center hole 144 and a second groove 142, and the second groove 142 is used for accommodating the protrusion 132;

[0042] An elastic body 150 has opposite third and fourth surfaces, the third surface is fixed on the first surface, and one end close to the fourth surface is inserted into the first groove 134 of the bottom plate 130, and the shape and size of the first groove 134 are the same as those of the elastic body 150 without elastic deformation;

[0043] A pressing block 160 is fixed on the second surface of the interlayer 120 and extends out through the center hole 144 of the top plate 140.

[0044] The application directly monitors the signal by the resistance grid deformation of the pressure sensing unit 110, can improve the monitoring accuracy and sensitivity, avoids the error caused by electromagnetic interference and secondary signal transformation, and improves the precision of signal change. Since the measurement method only needs to measure the voltage output signal value caused by the resistance grid deformation, the monitoring is completed by judging the signal amplitude and period, and the specific numerical value is not needed, so the measurement form is simple, and the measurement parameters are less. The method is simple, easy to implement, and low in cost, and does not need precise instruments and analysis methods. The graphene metal thin film sensor for sleep monitoring can simultaneously complete heartbeat, respiratory rate, sleep posture and sleep motion direction measurement.

[0045] The graphene metal thin film sensor for sleep monitoring can be used for monitoring heartbeat, respiration or sleep posture.

[0046] The graphene metal thin film sensor for sleep monitoring can be arranged in a mattress, a quilt or a bed board.

[0047] Please refer to Fig. 4In some embodiments, the sleep monitoring graphene metal film sensor further comprises a signal processing module 200, which is electrically connected with the pressure sensing unit 110, and is configured to convert the pressure signal of the pressure sensing unit 110 into an electrical signal.

[0048] In an embodiment, the signal processing module 200 comprises a signal collector 210, an amplifier 220, a filter 230, an A / D converter 240 and a PC computer terminal 250 connected in sequence. The sensor module 100 transmits the monitoring signal to the signal collector 210 through the pressure sensing unit 110, and transmits the signal to the PC computer terminal 250 through the amplifier 220, the filter 230 and the A / D converter 240 in sequence. After comparing the monitoring data obtained by the PC with the big data, the corresponding sleep monitoring results, the judgment and the measures to be taken can be obtained.

[0049] In some embodiments, an even number of pressure sensing units 110 are arranged on the first surface and the second surface respectively, and the even number of pressure sensing units 110 are arranged symmetrically. Multiple pressure sensors can increase the positional accuracy of pressure sensing, amplify the local and overall changes of pressure, and improve the accuracy of real-time monitoring. Symmetrical arrangement can reduce positional deviation, which is conducive to subsequent signal processing and analysis.

[0050] In some embodiments, the pressure sensing unit 110 is a multilayer film structure, which comprises, in sequence, an insulating layer, a patterned sensitive layer, an electrode arranged on the patterned sensitive layer, and a protective layer covering the part of the patterned sensitive layer not covered by the electrode.

[0051] The multilayer film structure can be prepared by a vapor deposition method. The sensitive layer has a certain pattern, including a thin film resistance grid and a thin film wire connected thereto. The resistance grid pattern of the sensitive layer can be obtained by etching. One end of the thin film wire is connected to the resistance grid, and the other end is connected to the input end of the signal collector in the signal processing module 200.

[0052] In some embodiments, the material of the patterned sensitive layer is a mixture of graphene and metal. Specifically, the metal can be selected from any one or more of nickel-chromium alloy and constantan.

[0053] Further, the thickness of the patterned sensitive film layer is 100 nm to 1000 nm.

[0054] Further, the material of the insulating layer can be any one or several of Al2O3, SiO2, Si3N4 and YSZ, and the thickness is 1 μm to 5 μm.

[0055] Further, the material of the protective layer can be any one or several of Al2O3, SiO2, Si3N4, YSZ, and the thickness is 1-5 μm.

[0056] The pressure sensing unit 110 is a conventional thin film pressure sensor structure, which will not be described here.

[0057] Please refer to Figs. 5-6 In a specific embodiment, the interlayer 120 is provided with four first hole bodies 122. The bottom plate 130 is provided with four protrusions 132 corresponding to the first hole bodies 122. The positions and shapes of the four protrusions 132 correspond to those of the four first hole bodies 122, so that the four protrusions 132 can extend out of the first hole bodies 122 after the interlayer 120 is assembled to the bottom plate 130. Preferably, the four first hole bodies 122 are arranged in a circularly symmetrical manner, i.e., the four first hole bodies 122 are symmetrically centered, i.e., the four first hole bodies 122 form a square region, each of the four first hole bodies 122 is distributed in a quarter of the square region, and the first hole bodies 122 adjacent in the horizontal and vertical directions are symmetrically distributed. The four protrusions 132 are arranged on the bottom plate 130 in the same circularly symmetrical manner. The interlayer 120 is provided with a first horizontal thin arm 124 and a first vertical thin arm 126 between the two first hole bodies 122 adjacent in the horizontal and vertical directions, respectively. The bottom plate 130 is provided with a second horizontal thin arm 134a and a second vertical thin arm 134b between the two protrusions 132 adjacent in the horizontal and vertical directions, respectively.

[0058] In some embodiments, the depth of the first groove 134 gradually increases from the edge of the bottom plate 130 to the center of the bottom plate 130, and the elastic body 150 matches the shape of the first groove 134. Preferably, the depth of the first groove 134 is slightly smaller than the depth of the elastic body 150 without elastic deformation, so that the elastic body 150 can tightly abut in the first groove 134. In this way, when pressure is applied to the sensor module 100, the stress of the entire elastic body 150 is more uniform. Compared with the first groove 134 with the same depth, the structure of the first groove 134 and the protrusion 132 in this embodiment makes the pressure sensing unit 110 more sensitive and accurate. In some embodiments, the first groove 134 is in the shape of an arch as a whole, i.e., the first groove 134 is formed in the shape of a middle deep and both sides gradually shallow.

[0059] In some embodiments, the four first holes 122 are arranged on the interlayer 120, and first transverse thin arms 124 and first longitudinal thin arms 126 are formed between two first holes 122 adjacent in the transverse direction and the longitudinal direction, respectively. The four protrusions 132 corresponding to the four first holes 122 are arranged on the bottom plate 130, and second transverse thin arms 134a and second longitudinal thin arms 134b are formed between two protrusions 132 adjacent in the transverse direction and the longitudinal direction, respectively. The first recess 134 is arranged on the second transverse thin arms 134a and the second longitudinal thin arms 134b. The first recess 134 is a cross-shaped first recess 134, and the transverse direction and the longitudinal direction of the cross-shaped first recess 134 extend along the second transverse thin arms 134a and the second longitudinal thin arms 134b, respectively. Preferably, the cross-shaped first recess 134 is arched as a whole, that is, the depth of the cross-shaped first recess 134 is the largest at the intersection of the transverse direction and the longitudinal direction, and gradually decreases in the direction of the edge. Similarly, please refer to Fig. 7 , the elastic body 150 is a cross-shaped elastic body 150, which is consistent with the structure of the first recess 134, and will not be described again.

[0060] In one embodiment, two pressure sensing units 110 are arranged on the first surface and the second surface of the interlayer 120, respectively, and the two pressure sensing units 110 are symmetrically arranged at the two ends of the first longitudinal thin arm 126. Preferably, the four pressure sensing units 110 on the first surface and the second surface are connected to form a Wheatstone bridge. The Wheatstone bridge itself has a temperature compensation effect, which saves the later circuit compensation and greatly simplifies the circuit.

[0061] Please refer to Fig. 8 , the second recess 142 of the top plate 140 can be a whole recess for accommodating the protrusions 132 of the bottom plate 130. When the protrusions 132 are multiple, the recess can be divided into the same number of sub-recesses, and each sub-recess accommodates one protrusion 132. The arrangement of the sub-recesses is consistent with the arrangement of the protrusions 132. The depth of the second recess 142 is equal to the height of the protrusions 132 or the depth of the second recess 142 is slightly smaller than the height of the protrusions 132, so that the depth of the second recess 142 is in interference fit with the protrusions 132, that is, the protrusions 132 are tightly buckled into the second recess 142. The center hole 144 is arranged on the bottom surface of the second recess 142.

[0062] The shape of the pressing block 160 matches the center hole 144 of the top plate 140. In some embodiments, the pressing block 160 is in the shape of a spherical segment, such as a hemisphere. The spherical segment has a small stress area and a large pressure, which causes a larger and more sensitive deformation of the sensor module 100.

[0063] In some embodiments, the material of the interlayer 120 is at least one of polyimide and polyester.

[0064] In some embodiments, the material of the bottom plate 130 is selected from at least one of polyimide and polyester.

[0065] In some embodiments, the material of the top plate 140 is selected from at least one of polyimide and polyester.

[0066] In some embodiments, the material of the pressure block 160 is selected from at least one of polyimide and polyester.

[0067] In some embodiments, the material of the elastic body 150 is selected from rubber, preferably silicone rubber.

[0068] The components of the sensor module 100 are fixedly connected, for example, bonded and fixed by glue, adhesive, etc., or interference fit by the boss of the mutual support.

[0069] In some embodiments, there are multiple sensor modules 100, and the multiple sensor modules 100 are arranged in an array and are electrically connected to the signal processing module 200. The multiple sensor modules 100 are arranged in an array in the same interlayer 120, and the multiple sensor modules 100 arranged in an array form an integral sensor module 100 system. The multiple sensor modules 100 transmit monitoring signals to the signal processing module 200, and after the sensor module 100 monitoring data is compared with big data, the corresponding sleep monitoring result can be obtained. The judgment and the measures to be taken are suggested. Preferably, the multiple sensor modules 100 are fixedly connected to a support structure to form an integral sensor system, which is convenient for assembly, movement, etc. during use.

[0070] When the system is working, the graphene metal film sensor for sleep monitoring is fixedly embedded in the mattress, close to the side of the human body contacting the surface of the mattress, and the installation plane of the sensor is unified with the plane of the mattress. The installation position is close to the position near the shoulder of the human body when lying down. The sensor module 100 system can completely cover the area occupied by the shoulder of the human body. The following is the actual operation of sleep detection using the sensor shown in the figure. Fig. 4

[0071] (1) Heartbeat monitoring:

[0072] ​When the human body is beating, the periodic heartbeat behavior will produce a periodic impact on the pressure block 160 in the sensor module 100 system, at this time, the pressure block 160 drives the 4 pressure sensing units 110 on the surface of the interlayer 120 to extrude the elastomer 150, because the elastomer 150 has a certain elasticity, so the pressure sensing unit 110 can periodically produce deformation and restore the initial state, so that the 4 thin film resistance gates inside the pressure sensing unit 110 will also periodically deform, the Wheatstone bridge circuit composed of the 4 thin film resistance gates converts the strain signal into a voltage signal, and the voltage signal is processed by the signal processing module 200 circuit, and finally the amplitude and period of the voltage signal corresponding to the heartbeat monitoring are obtained, and the heart rate is obtained by judging the period of the voltage signal.

[0073] (2) Respiratory monitoring:

[0074] When the human body is breathing, the principle is consistent with the heartbeat monitoring, but the amplitude of the voltage signal obtained at this time is larger than the amplitude of the voltage signal obtained when monitoring the heartbeat, at this time, the output signal is filtered by the filter to output a separate breathing signal, and the breathing frequency is obtained according to the analysis of the breathing signal, thereby realizing the respiratory monitoring.

[0075] (3) Sleep posture and sleep movement direction monitoring:

[0076] When the human body changes the sleep posture, the number of pressure sensing units 110 in the shoulder range that are contacted and extruded and the position of the pressure sensing units 110 will change, at this time, the deformation of the thin film resistance gate in the pressure sensing unit 110 will also change, at this time, the state of each sensor in the system can be judged by comparing the output signals in the sensor system. Because the extrusion force of the human shoulder on the contacted pressure sensing unit 110 is large when the sleep posture changes, compared with the output signals when monitoring the heartbeat and breathing, the corresponding output signal of the sensor module 100 is the largest, so that the voltage signal obtained by the sensor module 100 at this time is processed by the signal processing module 200 circuit, and the heartbeat, breathing signal and other interference can be filtered out, and finally the voltage output signal caused by the change of the sleep posture and the sleep movement is obtained, according to the analysis of whether the pressure arranged at different positions around the shoulder has an output signal, the sleep posture of the human body is judged, and the sleep movement direction of the human body is judged according to the change trend of the output signal.

[0077] The graphene metal thin film sensor for sleep monitoring can simultaneously realize the detection of heartbeat, breathing and sleep posture.

[0078] Any combination of the technical features in the above-described embodiments can be made, and for the sake of brevity, not all possible combinations are described, however, as long as the combination of the technical features does not exist in contradiction, it shall be considered within the scope of the present disclosure.

[0079] The above-described embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application patent shall be subject to the appended claims.

Claims

1. A graphene metal thin film sensor for sleep monitoring, characterized by, The sensor module comprises: a pressure sensing unit comprising, in sequence, an insulating layer, a patterned sensitive layer, an electrode disposed on the patterned sensitive layer, and a protective layer covering a portion of the patterned sensitive layer not covered by the electrode, the patterned sensitive layer being made of a graphene and metal mixed material; a sandwich layer comprising a body and a first hole body, the body comprising opposite first and second surfaces, the first hole body being disposed through the first and second surfaces, the first and second surfaces of the body having, in opposite positions, respectively, a pressure sensing unit fixedly arranged thereon; a bottom plate disposed on one side of the first surface of the sandwich layer, the same surface of the bottom plate being provided with a protrusion and a first groove, the protrusion being disposed outside the first groove, the protrusion being adapted in position and size to the first hole body; the depth of the first groove gradually increases from the edge of the bottom plate to the center of the bottom plate; the first groove is generally arched in shape; a top plate disposed on one side of the second surface of the sandwich layer, the top plate being provided with a central hole and a second groove for accommodating the protrusion; an elastic body having opposite third and fourth surfaces, the third surface being fixed on the first surface, the end close to the fourth surface being inserted into the first groove of the bottom plate, the first groove being the same in shape and size as the elastic body without elastic deformation; a pressure block in the shape of a spherical segment, fixedly arranged on the second surface of the sandwich layer and extending out through the central hole of the top plate.

2. The graphene metal film sensor for sleep monitoring according to claim 1, wherein, An even number of pressure sensing units are respectively arranged on the first and second surfaces in a symmetrical manner.

3. The graphene metal film sensor for sleep monitoring according to claim 1 or 2, characterized in that, Four first hole bodies are arranged in a central symmetrical manner on the sandwich layer, four protrusions corresponding to the first hole bodies are arranged on the bottom plate, first and second transverse thin arms and first and second longitudinal thin arms are respectively formed between two first hole bodies adjacent in the transverse and longitudinal directions, second and second transverse thin arms and second and second longitudinal thin arms are respectively formed between two protrusions adjacent in the transverse and longitudinal directions; the first grooves are arranged on the second transverse thin arms and the second longitudinal thin arms, the first grooves are cross-shaped first grooves, and the elastic body is a cross-shaped elastic body; and / or, two pressure sensing units are respectively arranged on the first and second surfaces of the sandwich layer, the two pressure sensing units being symmetrically arranged at the two ends of the first longitudinal thin arm; the four pressure sensing units on the first and second surfaces are connected to form a Wheatstone bridge.

4. The graphene metal film sensor for sleep monitoring according to claim 1 or 2, characterized in that, The material of the sandwich layer is selected from at least one of polyimide and polyester; and / or, the material of the bottom plate is selected from at least one of polyimide and polyester; and / or, the material of the top plate is selected from at least one of polyimide and polyester; and / or, the material of the pressure block is selected from at least one of polyimide and polyester; and / or, the material of the elastic body is selected from rubber.

5. The graphene metal film sensor for sleep monitoring according to claim 1 or 2, characterized in that, The signal processing module is electrically connected with the pressure sensing unit, and is used for converting the pressure signal of the pressure sensing unit into an electric signal.

6. The graphene metal film sensor for sleep monitoring according to claim 5, wherein, The sensor modules are arranged in an array and are electrically connected with the signal processing module.

7. Use of the graphene metal film sensor for sleep monitoring according to any one of claims 1-6 for monitoring heartbeat, respiration or sleeping posture.

8. A mattress, a quilt or a bed board containing the graphene metal film sensor for sleep monitoring according to any one of claims 1-6.

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