Optical fiber sensor, system and monitoring method

Abstract

The present invention discloses an optical fiber sensor, system and monitoring method, including a deformation structure and an optical fiber arranged in the deformation structure; wherein the deformation structure includes at least one deformation sensing layer, one side of the deformation sensing layer is provided with a convex ridge, and the other side is provided with a sensitivity enhancement structure at a position relative to the convex ridge; one end of the optical fiber is connected to a light source, and the other end is connected to a signal detector; the sensitivity enhancement structure includes a plurality of convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex ridge, so that the optical fiber produces a micro-bend deformation, and optical power loss occurs, the optical power loss is detected by the signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the external change parameter. The optical fiber sensor of the present invention has low cost, high sensitivity and precision.

Description

Technical Field

[0001] The present invention relates to the field of sensor technology, and in particular to an optical fiber sensor, system and monitoring method. Background Art

[0002] Fiber optic sensor technology is a new sensing technology that has emerged along with the development of optical fiber and fiber optic communication technology. Different from traditional sensing technology, the sensitivity, anti-interference and high applicability of fiber optic sensors are becoming the new favorites pursued by current scientific and technological development. Fiber optic sensing uses the fact that optical fiber is very sensitive to external environmental factors. For example, changes in environmental conditions such as temperature, pressure, electric field, and magnetic field will cause changes in light wave parameters, such as intensity, phase, frequency, and polarization state. Through the study of related light wave parameters, they can be utilized. At the same time, optical fiber itself has many advantages, such as low loss in long-distance transmission, easy to bend, small size, light weight, low cost, waterproof, fireproof, and high resistance to electromagnetic interference. Therefore, it is widely used in aviation, aerospace, navigation, nuclear industry, electric power, medical, petrochemical, mining, metallurgy and other industries.

[0003] Taking the application of respiratory and heartbeat detection as an example, there are currently two solutions using fiber optic sensing technology and piezoelectric sensing technology. Comparing the two solutions, fiber optic sensing has high detection accuracy and can reach medical level. Fiber optic sensing can accurately sense static and dynamic forces, has no radiation, and has a low price per unit area, which is convenient for large-area distributed monitoring. Piezoelectric sensing only responds to dynamic forces, cannot measure static forces, is prone to misjudgment, and cannot measure weight. It has low respiratory and heartbeat detection accuracy, has radiation, and has a high price per unit area, so it cannot be used for large-area distributed monitoring. Therefore, in the field of respiratory and heartbeat detection, the use of fiber optic sensing technology is generally popular.

[0004] Although fiber optic sensors have higher detection accuracy than piezoelectric sensors, the sensitivity, accuracy, and cost of fiber optic sensors currently used for respiratory and heartbeat detection still need to be improved. In addition, fiber optic sensors currently used for respiratory and heartbeat detection have poor consistency in the final product due to differences in the production process, resulting in a low yield rate.

[0005] The disclosure of the above-mentioned background technology content is only used to assist in understanding the inventive concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above-mentioned content has been disclosed on the filing date of this patent application, the above-mentioned background technology should not be used to evaluate the novelty and creativity of this application. Summary of the invention

[0006] The object of the present invention is to provide a fiber optic sensor, system and monitoring method to solve at least one of the above-mentioned background technical problems.

[0007] To achieve the above object, the technical solution of the embodiment of the present invention is implemented as follows:

[0008] An optical fiber sensor comprises a deformable structure and an optical fiber arranged in the deformable structure; wherein:

[0009] The deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side is provided with a sensitivity enhancement structure at a position opposite to the ridge;

[0010] One end of the optical fiber is connected to a light source, and the other end is connected to a signal detector;

[0011] The sensitivity enhancement structure includes a plurality of convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex ridges, so that the optical fiber produces a micro-bend deformation and optical power loss occurs. The optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the changing parameters of the outside world.

[0012] In some embodiments, a plurality of mesh holes are arranged on the deformation sensing layer, so that the deformation sensing layer as a whole forms a mesh structure.

[0013] In some embodiments, the inner surface of the deformation sensing layer is recessed to provide a concave space, and the convex ridge is provided in the concave space; the outer surface of the deformation sensing layer is provided with the sensitivity enhancement structure, and the convex point is provided at a position on the outer surface of the deformation sensing layer corresponding to the convex ridge.

[0014] In some embodiments, the optical fiber is placed in a curved shape on a convex ridge in the concave space, and both ends of the optical fiber are fixed by wire grooves provided on the inner side of the deformation sensing layer and extend outward.

[0015] In some embodiments, the ridges are arranged in straight or curved strips between the plurality of meshes, and the cross-section of the ridges is triangular.

[0016] In some embodiments, the deformation sensing layer includes a first deformation sensing layer and a second deformation sensing layer, and the size of the second deformation sensing layer is consistent with that of the first deformation sensing layer, so that the two are completely overlapped to form a complete whole after being installed together.

[0017] In some embodiments, when the first deformation sensing layer and the second deformation sensing layer are installed together, the ridges on the first deformation sensing layer and the ridges on the second deformation sensing layer are arranged in a staggered manner; wherein the ridges on the first deformation sensing layer correspond to the mesh holes on the second deformation sensing layer, and correspondingly, the mesh holes on the first deformation sensing layer correspond to the ridges on the second deformation sensing layer.

[0018] In some embodiments, the optical fiber is arranged between the first deformation sensing layer and the second deformation sensing layer; wherein, the first deformation sensing layer and the second deformation sensing layer have a side provided with a sensitivity enhancement structure in contact with the outside world, and a side provided with ridges in contact with the optical fiber through the ridges.

[0019] Another technical solution of the embodiment of the present invention is:

[0020] A fiber optic sensor system comprises the fiber optic sensor, a collection and processing module and a detection module as described in any of the technical solutions of the above embodiments; wherein:

[0021] The acquisition processing module includes a light source driving circuit, a light source power regulating circuit connected to the light source driving circuit, a light sensing detection circuit, an analog-to-digital conversion circuit connected to the light sensing detection circuit, an optical fiber signal processor, and an interactive port; wherein the light source driving circuit is connected to the light source of the optical fiber sensor, and the light sensing detection circuit is connected to the light sensing of the optical fiber sensor; the light source power regulating circuit, the analog-to-digital converter, and the sensor interactive port are respectively connected to the optical fiber signal processor;

[0022] The detection module includes an external interaction port and an external processor; the external processor is used to compare the output value of the light sensor with a preset standard output value, generate a control instruction according to the comparison result, and transmit the control instruction to the optical fiber signal processor through the external interaction port and the sensor interaction port. The optical fiber signal processor controls the light source adjustment circuit to adjust the luminous power of the light source according to the control instruction, thereby changing the output value of the adjusted light sensor.

[0023] Another technical solution of the embodiment of the present invention is:

[0024] A fiber optic sensor monitoring method comprises the following steps:

[0025] A deformation structure is provided, wherein the deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side is provided with a sensitivity enhancement structure at a position relative to the ridge;

[0026] An optical fiber is arranged in the deformable structure, one end of the optical fiber is connected to a light source, and the other end is connected to a signal detector;

[0027] Among them, the sensitivity enhancement structure is convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the convex points of the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex edges, causing the optical fiber to produce a micro-bend deformation and optical power loss. The optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the changing parameters of the outside world to complete the monitoring.

[0028] The beneficial effects of the technical solution of the present invention are:

[0029] Compared with the prior art, the optical fiber sensor of the present invention has low cost, high sensitivity and precision, and can avoid the problem of poor consistency of the final product caused by differences in the production process, thereby improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0031] Figure 1 FIG. 4 is a three-dimensional schematic diagram of an optical fiber sensor according to an embodiment of the present invention.

[0032] Figure 2 yes Figure 1 A three-dimensional schematic diagram of an embodiment without optical fiber.

[0033] Figure 3 yes Figure 2 A three-dimensional schematic diagram from another viewing angle of the embodiment.

[0034] Figure 4 is a three-dimensional schematic diagram of an optical fiber sensor according to another embodiment of the present invention.

[0035] Figure 5 yes Figure 4 Exploded view of an embodiment fiber optic sensor.

[0036] Figure 6 yes Figure 4 A three-dimensional schematic diagram of the optical fiber sensor of the embodiment from another perspective.

[0037] Figure 7 is along Figure 6 Section view in the AA direction.

[0038] Figure 8a Schematic diagram of the force on the convex points and ridges of the optical fiber sensor according to an embodiment of the present invention and the optical fiber.

[0039] Figure 8b This is a schematic diagram of the force on the optical fiber without a bump.

[0040] Fig. 9 It is a schematic cross-sectional diagram of the arrangement of the protrusions and ridges and the optical fiber of the optical fiber sensor according to another embodiment of the present invention.

[0041] Fig.10 This is a respiratory waveform diagram obtained when the optical fiber sensor according to an embodiment of the present invention is used to monitor respiration.

[0042] Fig.11 Schematic diagram of the structural components at both ends of the optical fiber of the optical fiber sensor according to an embodiment of the present invention.

[0043] Fig.12 is a schematic diagram of an optical fiber sensor system according to another embodiment of the present invention.

[0044] Fig.13 yes Fig.12 Module principle block diagram of an embodiment.

[0045] Fig.14 It is a module principle block diagram of a multifunctional optical fiber sensor system according to another embodiment of the present invention. DETAILED DESCRIPTION

[0046] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for fixing or for circuit connection.

[0048] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0049] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0050] An optical fiber sensor provided by an embodiment of the present invention comprises a deformation structure and an optical fiber arranged in the deformation structure; wherein the deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side is provided with a sensitivity enhancement structure at a position relative to the ridge; one end of the optical fiber is connected to a light source, and the other end is connected to a signal detector; in some embodiments, the sensitivity enhancement structure comprises a plurality of convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the ridge, so that the optical fiber produces a micro-bend deformation, and optical power loss occurs, and the optical power loss is detected by the signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the external change parameter. wherein the light source is a laser, a light emitting diode or any other light source of any wavelength band; the signal detector is a photosensitive device, which is used to convert the optical signal obtained from the optical fiber into an electrical signal.

[0051] Reference Figure 1-3 The structure of a single-layer sensing layer is shown. As an embodiment of the present invention, an optical fiber sensor 100 includes a deformation sensing layer 10 and an optical fiber 11. Specifically, a plurality of meshes 101 are arranged on the deformation sensing layer 10. The inner surface of the deformation sensing layer 10 is recessed to provide a concave space 102, and a convex ridge 103 is provided in the concave space 102. The outer surface of the deformation sensing layer 10 is provided with a sensitivity enhancement structure, and the sensitivity enhancement structure includes a plurality of convex points 105 arranged at intervals, and the convex points 105 are arranged at positions corresponding to the convex ridges 103 on the outer surface of the deformation sensing layer 10. The optical fiber 11 is placed on the convex ridges 103 in the concave space in a curved shape, and the two ends of the optical fiber 11 are fixed and extended outward by the wire grooves 104 provided on the inner side of the deformation sensing layer 10. It can be understood that the sensitivity enhancement structure is not limited to the structure using convex points, and other structures that are convenient for increasing the sensitivity of the sensor are also possible, which are not described one by one in the embodiments of the present invention.

[0052] By setting a plurality of meshes 101 on the deformation sensing layer 10, the deformation sensing layer 10 as a whole forms a mesh structure. At the same time, by setting a concave space 102 on the inner surface of the deformation sensing layer 10, the thickness of the deformation sensing layer 10 is reduced, thereby increasing the elasticity of the deformation sensing layer 10 and further improving the sensitivity of the optical fiber sensor 100. In addition, by setting the concave space 102, the ridge 103 is set in the concave space 102, which facilitates the miniaturization design of the optical fiber sensor. In the present embodiment, the mesh 101 is elliptical. It can be understood that in some embodiments, the mesh 101 can also be other irregular shapes. There is no special limitation in the embodiments of the present invention. No matter what shape is adopted, as long as it does not deviate from the main purpose of the invention, it belongs to the scope of protection of the present invention.

[0053] The ridges 103 are arranged in a straight strip shape between a plurality of meshes 101, and the cross section of the ridges 103 is a triangle, so that when the optical fiber 11 is placed on the ridges 103, the contact area between the optical fiber 11 and the ridges 103 is minimized, thereby ensuring that when subjected to external pressure, the pressure per unit area on the optical fiber 11 is maximized, that is, the sensitivity of the optical fiber sensor is enhanced. In an embodiment of the present invention, the height of the ridges 103 is set to have a difference with the depth of the depression of the concave space 102, and the difference is equal to the diameter of the optical fiber 11, so that when the optical fiber 11 is placed on the ridges 103, it can remain flush with the plane where the inner surface of the sensing layer is located. It is understandable that in some embodiments, the ridges 103 can also be arranged in a curved strip shape between a plurality of meshes 101.

[0054] When the optical fiber sensor of the embodiment of the present invention is used, a coating layer is attached to the surface of the deformation sensing layer 10, and the coating layer is made of a flexible material, such as a soft cushion. Figure 8a , Figure 8b As shown, the soft pad 122 is used as an example for explanation, wherein: Figure 8b The case where there is no convex point and the cross section of the convex ridge 103' is circular. Assuming that the pressure F is evenly distributed on the cushion 122, Figure 8a Due to the presence of the bump 105, the cushion 122 around the bump 105 will be arched to form a gap, and the pressure in the corresponding area above the gap will be concentrated on the bump 105, which is different from the structure without the bump ( Figure 8b ), the pressure on the convex point 105 will be greatly increased, and the increase is L2 / L1. By adding the convex point structure, the pressure distribution of the deformation sensing layer 10 is changed, the pressure at the intersection of the optical fiber 11 and the convex ridge 103 is increased, and the pressure in other areas is reduced. Figure 8b In comparison, by configuring the ridge 103 to have a triangular cross-section, the area of ​​the contact point between the optical fiber and the ridge is reduced, thereby increasing the pressure on the optical fiber at the contact point, thereby enhancing the sensitivity of the sensor.

[0055] Specifically, the two ends of the optical fiber 11 are connected to the light source and the signal detector through the first structural member and the second structural member respectively. In some embodiments, the first structural member and the second structural member can be combined together, or the first structural member and the second structural member can be separately provided; the structures of the two structural members can be the same or different. Fig.11 As shown, an example of two structural members having the same structure is used for explanation, wherein the structural member 500 includes a coaxial connector 50 and a threaded cap 51 connected to the coaxial connector 50; wherein one end of the coaxial connector 50 is connected to the light source 4, and the other end is connected to the optical fiber 11, and a thread 52 is provided at the end connected to the optical fiber 11, and the threaded cap 51 is tightened by the thread 52, thereby realizing the docking of the optical fiber 11 and the light source 4.

[0056] For the sake of convenience, the embodiment of the present invention is described by taking the deformation sensing layer in a square shape as an example. It should be noted that the present invention does not impose any limitation on the shape of the deformation sensing layer, which may be a square or any other irregular shape.

[0057] Reference Figure 4-7 The structure of a double-layer sensing layer is shown. As an optical fiber sensor 200 according to an embodiment of the present invention, the optical fiber sensor 200 includes two deformation sensing layers 20, 21 and an optical fiber 22. Specifically, the deformation sensing layer includes a first deformation sensing layer 20 and a second deformation sensing layer 21. The first deformation sensing layer 20 is provided with a plurality of first meshes 201. The inner side of the first deformation sensing layer 20 is recessed with a concave space 202, and the convex ridge 203 is arranged in the concave space 202. The outer surface of the first deformation sensing layer 20 is provided with a sensitivity enhancement structure, and the sensitivity enhancement structure includes a plurality of convex points 205 arranged at intervals, and the convex points 205 are arranged at positions corresponding to the convex ridges 203 on the outer surface of the first deformation sensing layer 20. A wire groove 204 is provided at one end of the inner side of the first deformation sensing layer 20 for fixing the optical fiber 22.

[0058] The size of the second deformation sensing layer 21 is consistent with that of the first deformation sensing layer 20 to ensure that the two can completely overlap to form a complete whole after being installed together. A plurality of second mesh holes 211 are arranged on the second deformation sensing layer 21; the inner side of the second deformation sensing layer 21 is recessed with a concave space (not shown), and the convex ridge 213 is arranged in the concave space; the outer surface of the second deformation sensing layer 21 is provided with a sensitivity enhancement structure, and the sensitivity enhancement structure includes a plurality of convex points 215 arranged at intervals, and the convex points 215 are arranged on the outer surface of the second deformation sensing layer 21 at positions corresponding to the convex ridges 213. A wire groove is provided at one end of the inner side of the second deformation sensing layer 21 for fixing the optical fiber 22.

[0059] The optical fiber 22 is bent in an irregular shape and installed between the first deformation sensing layer 20 and the second deformation sensing layer 21. Both ends of the optical fiber 22 are fixed through the wire grooves on the first and second deformation sensing layers and extend outward. In this embodiment, the height of the ridges 203 and 213 is set to have a difference with the depth of the concave space, and the difference is equal to half the diameter of the optical fiber. Therefore, when the first deformation sensing layer and the second deformation sensing layer are installed together, the optical fiber can tightly abut the ridges 203 and 213 on the first and second deformation sensing layers, and be tightly installed and fixed between the first deformation sensing layer 20 and the second deformation sensing layer 21.

[0060] Reference Figure 4 , Figure 7 As shown, in this embodiment, when the first and second deformation sensing layers 20, 21 are installed and matched together, the protrusions 205 and ridges 203 on the first deformation sensing layer 20 and the protrusions 215 and ridges 213 on the second deformation sensing layer 21 are arranged in a staggered manner; wherein, the ridges 203 on the first deformation sensing layer 20 correspond to the meshes 211 on the second deformation sensing layer 21, and correspondingly, the meshes 201 on the first deformation sensing layer 20 correspond to the ridges 213 on the second deformation sensing layer 21.

[0061] Reference Figure 4 As shown, in this embodiment, the optical fiber 22 is a multi-fold bending structure, which is arranged between the first deformation sensing layer 20 and the second deformation sensing layer 21. Among them, the first deformation sensing layer 20 and the second deformation sensing layer 21 are provided with a side of the sensitivity enhancement structure in contact with the outside world, and the side provided with ridges 203, 213 is in contact with the optical fiber 22 through the ridges 203, 213. When the external deformation or pressure acts on the convex points 205, 215 of the sensitivity enhancement structure, the first deformation sensing layer 20 and / or the second deformation sensing layer 21 is deformed, and the deformation is further transmitted to the optical fiber 22 through the ridges 203, 213 of the first deformation sensing layer 20 and / or the second deformation sensing layer 21, so that the optical fiber 22 is slightly bent and deformed, and optical power loss occurs. The optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the external change parameter.

[0062] Reference Fig.10As shown, taking the application of optical fiber sensor in monitoring breathing as an example, the sensitivity enhancement structure of the optical fiber sensor is in contact with the external human body, and the weak forces generated by human life activities such as breathing and heartbeat are transmitted to the first deformation sensing layer 20 and / or the second deformation sensing layer 21 through the sensitivity enhancement structure. The first deformation sensing layer 20 and / or the second deformation sensing layer 21 are deformed by the force, compressing the optical fiber 22 to cause micro-bending deformation, thereby causing micro-bending damage. This loss is converted into an electrical signal by the light sensing acquisition, and the data is processed by the acquisition and processing module to extract the vital signs data. Among them, the human life activities include: on the pillow, off the pillow, breathing, heartbeat, body movement, etc.; the vital signs data include: on the pillow, off the pillow, respiratory rate, heart rate, respiratory waveform, heartbeat waveform, body movement frequency and waveform. Refer to Fig.10 As shown, the breathing waveform under normal breathing conditions is B1, while the breathing waveform under holding the breath or no breathing conditions is B2. It can be seen that when the optical fiber sensor of the present invention is used for respiratory monitoring, data can be monitored under breathing (dynamic conditions) or no breathing (static conditions).

[0063] Reference Figure 7 As shown, compared with the structure of a single-layer sensing layer, in the double-layer sensing layer structure, both sides of the optical fiber 22 are arranged to contact the ridges 203 and 213 at staggered intervals, and the contact points between the optical fiber 22 and the ridges are dense, thereby greatly improving the sensitivity and test accuracy of the optical fiber sensor.

[0064] Reference Fig. 9 As shown, as another embodiment of the present invention, the optical fiber sensor can also be set as a three-layer sensing layer structure (not shown). Compared with the embodiment of the double-layer sensing layer structure, in the three-layer sensing layer structure, the optical fiber sensor 300 also includes an intermediate layer 32 arranged between the first deformation sensing layer 30 and the second deformation sensing layer 31; the first deformation sensing layer 30 and the second deformation sensing layer 31 also include ridges 303, 313, and convex points 305, 315; wherein, both sides of the intermediate layer are provided with concave spaces, and ridges 323 are arranged in the concave spaces; in some embodiments, the intermediate layer is also provided with optical fiber through holes (not shown), and the optical fiber 33 passes through the intermediate layer through the optical fiber through holes. It can be understood that, in some embodiments, the intermediate layer can also be provided with ridges 323 only on one side, and the other side is set as a smooth plane. For the structure of the three-layer sensing layer, the intermediate layer can be provided with meshes, of course, meshes can also be not provided.

[0065] Reference Fig.12 , Fig.13As shown, as another embodiment of the present invention, a fiber optic sensor system includes the fiber optic sensor, acquisition processing module 70 and detection module 80 described in any of the above-mentioned embodiments; the acquisition processing module 70 includes a light source driving circuit, a light source power adjustment circuit connected to the light source driving circuit, a light sensing detection circuit, an analog-to-digital conversion circuit connected to the light sensing detection circuit, a fiber optic signal processor, and an interactive port; wherein the light source driving circuit is connected to the light source 4 of the fiber optic sensor, and the light sensing detection circuit is connected to the light sensing 60 of the fiber optic sensor; the light source power adjustment circuit, the analog-to-digital converter and the sensor interactive port are respectively connected to the fiber optic signal processor; the detection module includes an external interactive port and an external processor. In the production process of the optical fiber sensor, a standard output value of the optical fiber sensor light perception is preset, and the optical fiber signal processor of the optical fiber sensor transmits the light perception output value to the external processor of the detection module through the sensor interaction port and the external interaction port of the detection module. The external processor compares the light perception output value with the preset standard output value, generates a control instruction according to the comparison result, and transmits the control instruction to the optical fiber signal processor through the external interaction port and the sensor interaction port. The optical fiber signal processor controls the light source adjustment circuit according to the control instruction to adjust the light power of the light source, thereby changing and adjusting the light perception output value, so that the light perception output value remains equal to the output standard value, thereby improving the consistency of the optical fiber sensor product. In some embodiments, the detection module of the optical fiber sensor system also includes a display for real-time display of relevant information such as the light perception output value.

[0066] Because there will be certain differences in the sensor production process, that is, the loss of the optical path from the light source to the photosensor is inconsistent. This difference is reflected in the same light source output power, but different photosensor outputs. Different photosensor outputs are not convenient for circuit processing, data collection and algorithm calculation, which will bring risks to product quality, consistency and stability. The light source power can be changed by adjusting the current of the light source through the light source power adjustment circuit, thereby improving the yield of product quality. Specifically, the adjustment can be carried out in the following way: assemble a number of sensors, determine the standard value of the photosensor output is A (assuming that A is proportional to the light source power); reduce the light source power of the sensor whose light output value is greater than A through the acquisition and processing module; increase the light source power of the sensor whose light output value is less than A.

[0067] Reference Fig.14As shown, as another embodiment of the present invention, a multifunctional sensor system includes the optical fiber sensor system described in the above-mentioned embodiment scheme, and a communication module, a user interface, a memory, and a multi-sensor drive and acquisition conversion module connected to the optical fiber signal processor of the optical fiber sensor; wherein the multi-sensor drive and acquisition conversion module is connected to a variety of sensors, so that through the combination of a variety of sensors and optical fiber sensors, the application of the sensor system can be greatly enriched and the function of the sensor system can be improved. In this embodiment, the multiple sensors include a temperature sensor, a humidity sensor, a microphone sensor, a piezoelectric sensor, and an inertial sensor. One or more combinations thereof. In some embodiments, the multifunctional sensor system also includes a remote processing and display unit, through which real-time interaction with the sensor system can be carried out.

[0068] As an optical fiber sensor monitoring method according to an embodiment of the present invention, the method includes:

[0069] A deformation structure is provided, wherein the deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side thereof is provided with a sensitivity enhancement structure at a position relative to the ridge;

[0070] An optical fiber is arranged in the deformable structure, one end of the optical fiber is connected to a light source, and the other end is connected to a signal detector;

[0071] Among them, the sensitivity enhancement structure is convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the convex points of the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex edges, causing the optical fiber to produce a micro-bend deformation and optical power loss. The optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the changing parameters of the outside world to complete the monitoring.

[0072] Specifically, a plurality of mesh holes are arranged on the deformation sensing layer; wherein, a concave space is arranged in the inner surface of the deformation sensing layer, and the convex ridge is arranged in the concave space; a sensitivity enhancement structure is arranged on the outer surface of the deformation sensing layer, and the sensitivity enhancement structure includes a plurality of convex points arranged at intervals, and the convex points are arranged at positions corresponding to the convex ridges on the outer surface of the deformation sensing layer; the optical fiber is placed in a curved shape on the convex ridge in the concave space, and both ends of the optical fiber are fixed by a wire groove arranged at one end of the inner side of the deformation sensing layer and extend outward.

[0073] It should be noted that the monitoring method of this embodiment is implemented by using the optical fiber sensor or optical fiber sensor system of any of the technical solutions of the aforementioned embodiments, so the specific implementation method refers to the description in the aforementioned embodiment and will not be repeated here.

[0074] The optical fiber sensor of the present invention has high sensitivity and accurate testing accuracy, which can reach medical level. It can accurately sense static force and dynamic force, has a wide range of applications and scenarios, and has a high product consistency rate and low cost, which is convenient for large-area distributed monitoring applications.

[0075] The present invention also proposes a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the sensor monitoring method of the above embodiment is implemented. The storage medium can be implemented by any type of volatile or non-volatile storage device, or a combination thereof.

[0076] Embodiments of the present invention may include or utilize a special or general-purpose computer including computer hardware, as discussed in more detail below. Embodiments within the scope of the present invention also include physical and other computer-readable media for carrying or storing computer-executable instructions and / or data structures. Such computer-readable media can be any available media that can be accessed by a general or special-purpose computer system. The computer-readable medium that stores computer-executable instructions is a physical storage medium. The computer-readable medium that carries computer-executable instructions is a transmission medium. Therefore, by way of example and not limitation, embodiments of the present invention may include at least two distinct computer-readable media: a physical computer-readable storage medium and a transmission computer-readable medium.

[0077] An embodiment of the present application also provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, at least the sensor monitoring method described in the aforementioned embodiment is implemented.

[0078] It is to be understood that the above content is a further detailed description of the present invention in conjunction with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be deemed to belong to the protection scope of the present invention. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention.

[0079] In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples without contradicting each other. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope defined by the appended claims.

[0080] Furthermore, the scope of the present invention is not intended to be limited to the particular embodiments of the processes, machines, manufactures, compositions of matter, means, methods, and steps described in the specification. One of ordinary skill in the art will readily appreciate that the above disclosures, processes, machines, manufactures, compositions of matter, means, methods, or steps, currently existing or to be developed, may be utilized to perform substantially the same functions as the corresponding embodiments described herein or to obtain substantially the same results as the embodiments described herein. Therefore, the appended claims are intended to include within their scope such processes, machines, manufactures, compositions of matter, means, methods, or steps.

Claims

1. An optical fiber sensor, characterized in that: It includes a deformable structure and an optical fiber arranged in the deformable structure; wherein, The deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side is provided with a sensitivity enhancement structure at a position opposite to the ridge; One end of the optical fiber is connected to a light source, and the other end is connected to a signal detector; The sensitivity enhancement structure includes a plurality of convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex ridges, so that the optical fiber is slightly bent and deformed, resulting in optical power loss, and the optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the change parameter of the outside world; The inner surface of the deformation sensing layer is concavely provided with a concave space, and the convex ridge is arranged in the concave space; the outer surface of the deformation sensing layer is provided with the sensitivity enhancement structure, and the convex point is arranged at a position corresponding to the convex ridge on the outer surface of the deformation sensing layer; The optical fiber is placed in a curved shape on the convex ridge in the concave space, and both ends of the optical fiber are fixed by wire grooves arranged inside the deformation sensing layer and extend outward; The convex ribs are arranged in a straight line or a curved line between a plurality of meshes, and the cross section of the convex ribs is triangular.

2. The optical fiber sensor according to claim 1, characterized in that: A plurality of mesh holes are arranged on the deformation sensing layer, so that the deformation sensing layer as a whole forms a mesh structure.

3. The optical fiber sensor according to claim 1, characterized in that: The deformation sensing layer comprises a first deformation sensing layer and a second deformation sensing layer, and the size of the second deformation sensing layer is consistent with that of the first deformation sensing layer, so that the two are completely overlapped to form a complete whole after being installed together.

4. The optical fiber sensor according to claim 3, characterized in that: When the first deformation sensing layer and the second deformation sensing layer are installed and matched together, the ridges on the first deformation sensing layer and the ridges on the second deformation sensing layer are arranged in a staggered manner; wherein the ridges on the first deformation sensing layer correspond to the mesh holes on the second deformation sensing layer, and correspondingly, the mesh holes on the first deformation sensing layer correspond to the ridges on the second deformation sensing layer.

5. The optical fiber sensor according to claim 4, characterized in that: The optical fiber is arranged between the first deformation sensing layer and the second deformation sensing layer; wherein, the first deformation sensing layer and the second deformation sensing layer have a side provided with a sensitivity enhancement structure in contact with the outside, and a side provided with ridges in contact with the optical fiber through the ridges.

6. An optical fiber sensor system, characterized in that: It comprises the optical fiber sensor, acquisition processing module and detection module according to any one of claims 1 to 5; wherein, The acquisition processing module includes a light source driving circuit, a light source power regulating circuit connected to the light source driving circuit, a light sensing detection circuit, an analog-to-digital conversion circuit connected to the light sensing detection circuit, an optical fiber signal processor, and an interactive port; wherein the light source driving circuit is connected to the light source of the optical fiber sensor, and the light sensing detection circuit is connected to the light sensing of the optical fiber sensor; the light source power regulating circuit, the analog-to-digital converter, and the sensor interactive port are respectively connected to the optical fiber signal processor; The detection module includes an external interaction port and an external processor; the external processor is used to compare the output value of the light sensor with a preset standard output value, generate a control instruction according to the comparison result, and transmit the control instruction to the optical fiber signal processor through the external interaction port and the sensor interaction port. The optical fiber signal processor controls the light source adjustment circuit to adjust the luminous power of the light source according to the control instruction, thereby changing the output value of the adjusted light sensor.

7. A fiber optic sensor monitoring method, characterized in that: The steps include: A deformation structure is provided, wherein the deformation structure comprises at least one deformation sensing layer, one side of the deformation sensing layer is provided with a ridge, and the other side is provided with a sensitivity enhancement structure at a position relative to the ridge; An optical fiber is arranged in the deformable structure, one end of the optical fiber is connected to a light source, and the other end is connected to a signal detector; Among them, the sensitivity enhancement structure is convex points arranged at intervals; the deformation sensing layer is in contact with the outside world, and the deformation or pressure of the outside world acts on the convex points of the sensitivity enhancement structure, causing the deformation of the deformation sensing layer, and then the deformation is transmitted to the optical fiber through the convex edges, causing the optical fiber to produce a micro-bend deformation and optical power loss. The optical power loss is detected by a signal detector and converted into an electrical signal, and the electrical signal is processed to obtain the changing parameters of the outside world to complete the monitoring.

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