CN112414596A - Optical fiber sensor, system and monitoring method - Google Patents
Optical fiber sensor, system and monitoring method Download PDFInfo
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/024—Detecting, measuring or recording pulse rate or heart rate
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- A61B5/103—Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes
- A61B5/11—Measuring movement of the entire body or parts thereof, e.g. head or hand tremor, mobility of a limb
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Abstract
The invention discloses an optical fiber sensor, an optical fiber system and a monitoring method, wherein the optical fiber sensor comprises a deformation structure and an optical fiber arranged in the deformation structure; the deformation structure comprises at least one deformation induction layer, one surface of the deformation induction layer is provided with a convex edge, and the other surface of the deformation induction layer is provided with a sensitization structure at a position opposite to the convex edge; one end of the optical fiber is connected with the light source, and the other end of the optical fiber is connected with the signal detector; the sensitization structure comprises a plurality of salient points which are arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on sensitization structure arouses the deformation of deformation response layer, and then conducts deformation to optic fibre through the bead for optic fibre produces the microbending deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter. The optical fiber sensor has low cost and high sensitivity and precision.
Description
Technical Field
The invention relates to the technical field of sensors, in particular to an optical fiber sensor, an optical fiber system and a monitoring method.
Background
The optical fiber sensor technology is a brand-new sensing technology along with the development of optical fiber and optical fiber communication technology, and is different from the traditional sensing technology, and the sensitivity, the anti-interference performance and the high applicability of the optical fiber sensor become new pets pursued by the current technological development. Optical fiber sensing is a method that optical fibers are very sensitive to external environmental factors, such as temperature, pressure, electric field, magnetic field and other environmental conditions, which cause light wave parameters, for example: variations in intensity, phase, frequency, polarization, etc. The optical fiber can be utilized through research related to optical wave parameters, and meanwhile, the optical fiber has many advantages such as low long-distance transmission loss, flexibility, small volume, light weight, low cost, water resistance, fire resistance, high electromagnetic interference resistance and the like, so that the optical fiber has wide application in the industries such as aviation, aerospace, navigation, nuclear industry, electric power, medical treatment, petrochemical industry, mine industry, metallurgy and the like.
By taking the breath heartbeat detection application as an example, the optical fiber sensing technical scheme and the piezoelectric sensing technical scheme are adopted at present, compared with the two schemes, the optical fiber sensing detection precision is high, the medical grade can be achieved, the optical fiber sensing can accurately sense the static force and the dynamic force, the radiation is avoided, the unit area price cost is low, and the large-area distributed monitoring is convenient. The piezoelectric sensor only responds to dynamic force, cannot measure static force, is easy to generate misjudgment, cannot measure weight, has low detection precision of breathing and heartbeat, has radiation and high price cost per unit area, and cannot be used for large-area distributed monitoring. Therefore, in the field of respiratory heartbeat detection, the technical scheme of adopting optical fiber sensing is generally popular.
Although the optical fiber sensor has high detection accuracy compared with a piezoelectric sensor, the sensitivity, accuracy, cost and the like of the optical fiber sensor applied to the respiration heartbeat detection at present still have room to be improved, and the consistency of a final finished product is poor due to differences in the production process of the optical fiber sensor applied to the respiration heartbeat detection at present, so that the yield is low.
The above background disclosure is only for the purpose of assisting understanding of the inventive concept and technical solutions of the present invention, and does not necessarily belong to the prior art of the present patent application, and should not be used for evaluating the novelty and inventive step of the present application in the case that there is no clear evidence that the above content is disclosed at the filing date of the present patent application.
Disclosure of Invention
It is an object of the present invention to provide an optical fiber sensor, system and monitoring method to solve at least one of the above-mentioned problems of the background art.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
an optical fiber sensor comprises a deformation structure and an optical fiber arranged in the deformation structure; wherein the content of the first and second substances,
the deformation structure comprises at least one deformation induction layer, one surface of the deformation induction layer is provided with a convex edge, and the other surface of the deformation induction layer is provided with a sensitization structure at a position opposite to the convex edge;
one end of the optical fiber is connected with the light source, and the other end of the optical fiber is connected with the signal detector;
the sensitization structure comprises a plurality of salient points which are arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on sensitization structure arouses the deformation of deformation response layer, and then conducts deformation to optic fibre through the bead for optic fibre produces the microbending deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter.
In some embodiments, the deformation sensing layer has a plurality of mesh holes arranged thereon, such that the deformation sensing layer integrally forms a mesh structure.
In some embodiments, the inner surface of the deformation sensing layer is concavely provided with a concave space, and the convex edge is arranged in the concave space; the surface on deformation response layer sets up sensitization structure, the bump sets up on deformation response layer surface corresponding to the position department of bead.
In some embodiments, the optical fiber is placed on the rib in the concave space in a curved shape, and two ends of the optical fiber are fixed and extend outwards through the wire grooves arranged on the inner side of the deformation sensing layer.
In some embodiments, the ribs are arranged in a linear or curved strip arranged between the plurality of meshes, and the cross section of the ribs is triangular.
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 the same as that of the first deformation sensing layer, so that the two layers are completely overlapped to form a complete whole after being installed together.
In some embodiments, when the first deformation sensing layer and the second deformation sensing layer are installed and matched together, the convex ribs on the first deformation sensing layer and the convex ribs on the second deformation sensing layer are arranged in a staggered manner; the convex ribs on the first deformation sensing layer correspond to the meshes on the second deformation sensing layer, and correspondingly, the meshes on the first deformation sensing layer correspond to the convex ribs on the second deformation sensing layer.
In some embodiments, the optical fiber is disposed between the first and second deformation sensing layers; the first deformation induction layer and the second deformation induction layer are in contact with the outside through the surface provided with the sensitization structure, and the surface provided with the convex edge is in contact with the optical fiber through the convex edge.
The other technical scheme of the embodiment of the invention is as follows:
an optical fiber sensor system comprises the optical fiber sensor, an acquisition processing module and a detection module, wherein the optical fiber sensor is described in any embodiment; wherein the content of the first and second substances,
the acquisition processing module comprises a light source driving circuit, a light source power regulating circuit connected with the light source driving circuit, a light sensation detection circuit, an analog-to-digital conversion circuit connected with the light sensation detection circuit, an optical fiber signal processor and an interaction port; the light source driving circuit is connected with a light source of the optical fiber sensor, and the light sensation detection circuit is connected with the light sensation of the optical fiber sensor; the light source power regulating circuit, the analog-to-digital converter and the sensor interaction port are respectively connected with the optical fiber signal processor;
the detection module comprises an external interaction port and an external processor; the external processor is used for comparing the output value of the light sensation with a preset standard output value, generating a control instruction according to a comparison result and transmitting the control instruction to the optical fiber signal processor through the external interaction port and the sensor interaction port, and the optical fiber signal processor controls the light source adjusting circuit to adjust the light emitting power of the light source according to the control instruction so as to change and adjust the output value of the light sensation.
The embodiment of the invention adopts another technical scheme that:
an optical fiber sensor monitoring method comprises the following steps:
providing a deformation structure, wherein the deformation structure comprises at least one deformation sensing layer, one surface of the deformation sensing layer is provided with a convex edge, and the other surface of the deformation sensing layer is provided with a sensitization structure at a position corresponding to the convex edge;
arranging an optical fiber in a deformation structure, wherein one end of the optical fiber is connected with a light source, and the other end of the optical fiber is connected with a signal detector;
wherein, the sensitization structure is salient points arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on the bump of sensitization structure, arouse the deformation of deformation response layer, and then conduct deformation to optic fibre through the bead for optic fibre produces little curved deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter, accomplishes the monitoring.
The technical scheme of the invention has the beneficial effects that:
compared with the prior art, the optical fiber sensor has the advantages of low cost, high sensitivity and high precision, can avoid the problem of poor consistency of a final finished product caused by difference in the production process, and can improve the yield of the product.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic perspective view of an optical fiber sensor according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of the embodiment of fig. 1 without the optical fibers.
Fig. 3 is a perspective view of the embodiment of fig. 2 from another perspective.
Fig. 4 is a schematic perspective view of an optical fiber sensor according to another embodiment of the present invention.
Fig. 5 is an exploded view of the optical fiber sensor of the embodiment of fig. 4.
Fig. 6 is a perspective view of another perspective of the optical fiber sensor of the embodiment of fig. 4.
Fig. 7 is a sectional view taken along the line a-a in fig. 6.
FIG. 8a is a diagram illustrating a bump of an optical fiber sensor and a stress applied to a rib and an optical fiber according to an embodiment of the present invention.
FIG. 8b is a graph showing the force applied to the optical fiber without the bump.
Fig. 9 is a schematic cross-sectional view of the bumps and ribs and the arrangement of optical fibers of an optical fiber sensor according to another embodiment of the present invention.
Fig. 10 is a waveform diagram of respiration obtained when the optical fiber sensor according to the embodiment of the present invention is applied to monitoring respiration.
Fig. 11 is a schematic view of structural members at two ends of an optical fiber sensor according to an embodiment of the present invention.
FIG. 12 is a schematic diagram of a fiber sensor system according to another embodiment of the invention.
Fig. 13 is a block schematic diagram of the embodiment of fig. 12.
Fig. 14 is a block schematic diagram of a multifunctional fiber sensor system according to another embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the embodiments of the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will 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 be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element. The connection may be for fixation or for circuit connection.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in an orientation or positional relationship indicated in the drawings for convenience in describing the embodiments of the present invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed in a particular orientation, and be in any way limiting of the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed 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 that feature. In the description of the embodiments of the present invention, "a plurality" means two or more unless specifically limited otherwise.
The optical fiber sensor provided by the embodiment of the invention comprises a deformation structure and an optical fiber arranged in the deformation structure; the deformation structure comprises at least one deformation induction layer, one surface of the deformation induction layer is provided with a convex edge, and the other surface of the deformation induction layer is provided with a sensitization structure at a position opposite to the convex edge; one end of the optical fiber is connected with the light source, and the other end of the optical fiber is connected with the signal detector; in some embodiments, the sensitization structure comprises a plurality of salient points arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on the sensitization structure, arouse the deformation of deformation response layer, and then conduct deformation to optic fibre through the bead for optic fibre produces the microbending deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter. Wherein, the light source is a laser, a light emitting diode or any other waveband light source; the signal detector is light sensitive and is used for converting an optical signal obtained from the optical fiber into an electrical signal.
Referring to fig. 1-3, which illustrate a structure of a single sensing layer, as an embodiment of the optical fiber sensor 100 of the present invention, the 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; wherein, the inner surface of the deformation induction layer 10 is concavely provided with a concave space 102, and a convex rib 103 is arranged in the concave space 102; the outer surface of the deformation induction layer 10 is provided with a sensitization structure, the sensitization structure comprises a plurality of salient points 105 which are arranged at intervals, and the salient points 105 are arranged on the outer surface of the deformation induction layer 10 and correspond to the positions of the convex ribs 103; the optical fiber 11 is placed on the convex rib 103 in the concave space in a bending shape, and two ends of the optical fiber 11 are fixed and extend outwards through the wire grooves 104 arranged on the inner side of the deformation induction layer 10. It is understood that the sensitization structure is not limited to the structure using the bump, and other structures for increasing the sensitivity of the sensor are also possible, which are not necessarily described in the embodiment of the present invention.
Through set up plural mesh 101 on deformation response layer 10 for deformation response layer 10 wholly constitutes a network structure, simultaneously, through setting up concave type space 102 at deformation response layer 10 internal surface, reduces the thickness of deformation response layer 10, thereby has increased the elasticity of deformation response layer 10, has further promoted optical fiber sensor 100's sensitivity. In addition, by providing the concave space 102 and providing the rib 103 in the concave space 102, the miniaturization design of the optical fiber sensor is facilitated. In the present embodiment, the mesh openings 101 are oval, and it is understood that in some embodiments, the mesh openings 101 may also be in other non-irregular shapes, which is not particularly limited in the embodiments of the present invention, and any shape may be adopted without departing from the spirit of the present invention, so that the present invention is within the protection scope.
The rib 103 is arranged in a linear strip shape arranged among the plurality of meshes 101, and the cross section of the rib 103 is triangular, so that when the optical fiber 11 is placed on the rib 103, the contact area between the optical fiber 11 and the rib 103 is the smallest, thereby ensuring that when the optical fiber 11 is subjected to external pressure, the pressure per unit area on the optical fiber 11 is the largest, i.e. the sensitivity of the optical fiber sensor is enhanced. In the embodiment of the present invention, the height of the rib 103 is set to have a difference from the depth of the recess of the concave space 102, which is equal to the diameter of the optical fiber 11, so that the optical fiber 11 can be kept flush with the plane of the inner surface of the sensing layer when placed on the rib 103. It will be appreciated that in some embodiments, the ribs 103 may also be arranged in curved strips arranged between the plurality of mesh openings 101.
When the optical fiber sensor is applied, the surface of the deformation sensing layer 10 is coated with a coating layer, and the coating layer is made of flexible materials, such as a soft pad. The cushion 122 is described by way of example with reference to fig. 8a and 8b, where fig. 8b shows a case where there is no convex point and the cross section of the rib 103' is circular. Assuming that the pressure F is uniformly distributed on the soft pad 122, in fig. 8a, due to the existence of the bump 105, the soft pad 122 around the bump 105 will arch to form a gap, and the pressure in the corresponding area above the gap will be concentrated on the bump 105, and the pressure borne by the bump 105 will be greatly increased by a factor of L2/L1 compared to the structure without bump (fig. 8 b). By adding the bump structure, the pressure distribution of the deformation sensing layer 10 is changed, the pressure of the intersection point area of the optical fiber 11 and the rib 103 is increased, and the pressure of other areas is reduced. Meanwhile, compared with fig. 8b, the area of the contact point between the optical fiber and the rib is reduced by arranging the rib 103 in a structure with a triangular cross section, so that the pressure applied to the optical fiber at the contact point is increased, and the sensitivity of the sensor is enhanced.
Specifically, two ends of the optical fiber 11 are connected with the light source and the signal detector through a first structural member and a second structural member, respectively. In some embodiments, the first and second structural members may be combined together, or the first and second structural members may be separately and separately provided; the two structural members may be of the same or different construction. Referring to fig. 11, an example in which two structural members have the same structure is described, where the structural member 500 includes a coaxial connector 50, and a screw cap 51 connected to the coaxial connector 50; one end of the coaxial connector 50 is connected with the light source 4, the other end of the coaxial connector is connected with the optical fiber 11, a thread 52 is arranged at one end of the optical fiber 11, and the thread cap 51 is screwed through the thread 52, so that the optical fiber 11 is butted with the light source 4.
For convenience of description, the deformation sensing layer is illustrated as being square in the embodiment of the present invention, and it should be noted that the present invention does not limit the shape of the deformation sensing layer, and may be square or any other irregular shape.
Referring to fig. 4-7, which illustrate a structure of a double sensing layer, 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; wherein, a plurality of first meshes 201 are arranged on the first deformation sensing layer 20; a concave space 202 is concavely arranged on the inner side of the first deformation sensing layer 20, and the convex rib 203 is arranged in the concave space 202; the outer surface of the first deformation sensing layer 20 is provided with a sensitization structure, the sensitization structure comprises a plurality of salient points 205 arranged at intervals, and the salient points 205 are arranged on the outer surface of the first deformation sensing layer 20 and correspond to the positions of the convex ribs 203. A slot 204 is formed at one end of the inner side of the first deformation sensing layer 20 for fixing the optical fiber 22.
The second deformation sensing layer 21 has the same size as the first deformation sensing layer 20, so as to ensure that the two layers are completely overlapped to form a complete whole after being mounted together. A plurality of second mesh holes 211 are arranged on the second deformation sensing layer 21; a concave space (not shown) is concavely arranged on the inner side of the second deformation sensing layer 21, and the convex rib 213 is arranged in the concave space; the outer surface of the second deformation sensing layer 21 is provided with a sensitivity enhancing structure, the sensitivity enhancing structure comprises a plurality of protruding points 215 arranged at intervals, and the protruding points 215 are arranged on the outer surface of the second deformation sensing layer 21 at positions corresponding to the protruding ribs 213. A wire groove is formed at one end of the inner side of the second deformation sensing layer 21 to fix the optical fiber 22.
The optical fiber 22 is bent in an irregular shape and is installed between the first deformation sensing layer 20 and the second deformation sensing layer 21, and two ends of the optical fiber 22 are fixed through the wire grooves in the first and second deformation sensing layers and extend outwards. In this embodiment, the height of the ribs 203, 213 is set to have a difference from the depth of the concave space, which is equal to one-half of the diameter of the optical fiber, so that the optical fiber can tightly abut against the ribs 203, 213 of the first and second deformation sensing layers and be tightly fixed between the first and second deformation sensing layers 20, 21 when the first and second deformation sensing layers are mounted together.
Referring to fig. 4 and 7, in this embodiment, when the first deformation sensing layer 20 and the second deformation sensing layer 21 are assembled and matched together, the protrusions 205 and the ribs 203 on the first deformation sensing layer 20 and the protrusions 215 and the ribs 213 on the second deformation sensing layer 21 are arranged in a staggered manner; the ribs 203 of the first deformation sensing layer 20 correspond to the holes 211 of the second deformation sensing layer 21, and correspondingly, the holes 201 of the first deformation sensing layer 20 correspond to the ribs 213 of the second deformation sensing layer 21.
Referring to fig. 4, in the present embodiment, the optical fiber 22 is a multi-fold bent structure, and is disposed between the first deformation sensing layer 20 and the second deformation sensing layer 21. The first deformation sensing layer 20 and the second deformation sensing layer 21 have the sensitivity enhancing structures on the surfaces contacting with the outside, and the surfaces having the ribs 203, 213 contact with the optical fiber 22 through the ribs 203, 213. When external deformation or pressure acts on the salient points 205 and 215 of the sensitization structure, deformation of the first deformation sensing layer 20 and/or the second deformation sensing layer 21 is caused, deformation is conducted to the optical fiber 22 through the convex ribs 203 and 213 of the first deformation sensing layer 20 and/or the second deformation sensing layer 21, so that the optical fiber 22 generates micro-bending deformation and optical power loss occurs, the optical power loss is detected through the signal detector and converted into an electric signal, and the electric signal is processed to obtain an external change parameter.
Referring to fig. 10, taking an example that the optical fiber sensor is applied to monitoring respiration as an example for explanation, a sensitivity enhancing structure of the optical fiber sensor is in contact with an external human body, weak force such as respiration and heartbeat generated by human body vital activities is transmitted to the first deformation sensing layer 20 and/or the second deformation sensing layer 21 through the sensitivity enhancing structure, the first deformation sensing layer 20 and/or the second deformation sensing layer 21 is deformed by force and deformation to press the optical fiber 22 to generate micro-bending deformation, and further generate micro-bending damage, the loss is acquired by light sense and converted into an electrical signal, and the acquisition processing module performs data processing to extract vital sign data. Wherein the human life activities include: on, off, breathing, heartbeat, body movement, etc.; the vital sign data includes: on-pillow, off-pillow, respiration rate, heart rate, respiration waveform, heartbeat waveform, body movement times and waveform. Referring to fig. 10, the respiration waveform in the normal respiration condition is B1, and the respiration waveform in the breath holding or non-respiration condition is B2, so that when the optical fiber sensor of the present invention is used for respiration monitoring, the data can be monitored in both the respiration (dynamic condition) and the non-respiration (static condition).
Referring to fig. 7, compared to the single-layer sensing layer structure, in the double-layer sensing layer structure, both sides of the optical fiber 22 are configured to contact the ribs 203, 213 at staggered intervals, and the contact points of the optical fiber 22 and the ribs are dense, so that the sensitivity and the test accuracy of the optical fiber sensor are greatly improved.
Referring to fig. 9, as another embodiment of the present invention, the optical fiber sensor may also be configured as a three-layer sensing layer structure (not shown), in which the optical fiber sensor 300 further includes an intermediate layer 32 disposed between the first deformation sensing layer 30 and the second deformation sensing layer 31, compared to the embodiment of the two-layer sensing layer structure; the first deformation sensing layer 30 and the second deformation sensing layer 31 also include ribs 303, 313, bumps 305, 315; concave spaces are formed in two surfaces of the middle layer, and convex ribs 323 are arranged in the concave spaces; in some embodiments, the intermediate layer is further provided with fiber through holes (not shown) through which the optical fibers 33 pass through the intermediate layer. It will be appreciated that in some embodiments, the middle layer may be provided with ribs 323 on only one side and a smooth flat surface on the other side. For a three-layer inductive layer structure, the middle layer may be provided with meshes, or of course, the mesh may not be provided.
Referring to fig. 12 and 13, as another embodiment of the optical fiber sensor system according to the present invention, the system includes an optical fiber sensor according to any of the embodiments described above, an acquisition processing module 70, and a detection module 80; the acquisition processing module 70 comprises a light source driving circuit, a light source power regulating circuit connected with the light source driving circuit, a light sensation detection circuit, an analog-to-digital conversion circuit connected with the light sensation detection circuit, an optical fiber signal processor and an interaction port; the light source driving circuit is connected with the light source 4 of the optical fiber sensor, and the light sensation detection circuit is connected with the light sensation 60 of the optical fiber sensor; the light source power regulating circuit, the analog-to-digital converter and the sensor interaction port are respectively connected with the optical fiber signal processor; the detection module comprises an external interaction port and an external processor. The optical fiber sensor comprises an optical fiber sensor, a sensor interaction port, a detection module, an optical fiber signal processor, a light sensing output value, a control instruction and a light source adjusting circuit, wherein the optical fiber sensor is preset with a standard output value of the optical fiber sensor, the optical fiber signal processor of the optical fiber sensor transmits the light sensing output value to an external processor of the detection module through the sensor interaction port and an external interaction port of the detection module, the external processor compares the light sensing output value with a preset standard output value, the control instruction is generated according to a comparison result and transmitted 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 adjusting circuit according to the control instruction so as to adjust the luminous power of a light source, and then the light sensing output value is changed and adjusted, so that the light sensing output value is equal to. In some embodiments, the detection module of the optical fiber sensor system further includes a display for displaying the light sensation output value and other related information in real time.
Because a certain difference is generated in the production process of the sensor, namely the loss generated by the light path from the light source to the light sensation is inconsistent, the difference is that the output power of the light source is the same, but the output of the light sensation is different. The light sensation output is different, which is inconvenient for circuit processing, data acquisition and algorithm calculation, and brings risks to product quality, consistency and stability. The light source power adjusting circuit adjusts the current of the light source to change the luminous power of the light source, so that the yield of product quality can be improved. Specifically, the adjustment can be performed by: a plurality of sensors are assembled, and the standard light sensation output value is determined to be A (assuming that A is in direct proportion to the luminous power of a light source); the light source luminous power of the sensor with the light sensation output value larger than A is reduced through the acquisition processing module; and increasing the light emitting power of the light source of the sensor with the light sensation output value smaller than A.
Referring to fig. 14, a multifunctional sensor system as another embodiment of the present invention includes the optical fiber sensor system described in the above embodiment, and a communication module, a user interface, a memory, and a multi-sensor driving and collecting conversion module connected to an optical fiber signal processor of the optical fiber sensor; wherein, multisensor drive and collection conversion module are connected with multiple sensor to through multiple sensor and optical fiber sensor's combination, can richen sensor system's application greatly, promoted sensor system's function. In this embodiment, the plurality of sensors includes one or more of a temperature sensor, a humidity sensor, a microphone sensor, a piezoelectric sensor, and an inertial sensor. In some embodiments, the multifunctional sensor system further comprises a remote processing and display unit, through which the multifunctional sensor system can interact with the sensor system in real time, and the like.
As an embodiment of the present invention, a method for monitoring an optical fiber sensor includes:
providing a deformation structure, wherein the deformation structure comprises at least one deformation sensing layer, one surface of the deformation sensing layer is provided with a convex edge, and the other surface of the deformation sensing layer is provided with a sensitization structure corresponding to the position of the convex edge;
arranging an optical fiber in a deformation structure, wherein one end of the optical fiber is connected with a light source, and the other end of the optical fiber is connected with a signal detector;
wherein, the sensitization structure is salient points arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on the bump of sensitization structure, arouse the deformation of deformation response layer, and then conduct deformation to optic fibre through the bead for optic fibre produces little curved deformation, appears the optical power loss, surveys through signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter, accomplishes the monitoring.
Specifically, a plurality of meshes are arranged on the deformation induction layer; the inner surface of the deformation induction layer is concavely provided with a concave space, and the convex edge is arranged in the concave space; the outer surface of the deformation sensing layer is provided with a sensitization structure, the sensitization structure comprises a plurality of salient points which are arranged at intervals, and the salient points are arranged on the outer surface of the deformation sensing layer at positions corresponding to the convex edges; the optical fibers are placed on the convex edges in the concave space in a bending mode, and the two ends of the optical fibers are fixed through the wire grooves formed in one end of the inner side of the deformation sensing layer and extend outwards.
It should be noted that, the monitoring method in this embodiment is implemented by using the optical fiber sensor or the optical fiber sensor system in any of the foregoing embodiments, so that the specific implementation method refers to the description in the foregoing embodiments and is not described herein again.
The optical fiber sensor has the advantages of high sensitivity, accurate test precision, capability of reaching the medical grade, capability of accurately sensing static force and dynamic force, wide application range and scene, high product consistency and yield, low cost and convenience for large-area distributed monitoring application.
The invention further provides a computer readable storage medium, wherein a computer program is stored in the computer readable storage medium, and when the computer program is executed by a processor, the sensor monitoring method of the embodiment is realized. The storage medium may be implemented by any type of volatile or non-volatile storage device, or combination thereof.
Embodiments of the present invention may comprise or utilize a special purpose or general-purpose computer including computer hardware, as discussed in greater 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 purpose or special purpose computer system. The computer-readable medium storing the computer-executable instructions is a physical storage medium. Computer-readable media carrying computer-executable instructions are transmission media. Thus, by way of example, and not limitation, embodiments of the invention can include at least two distinct computer-readable media: physical computer-readable storage media and transmission computer-readable media.
The embodiment of the present application further provides a computer device, which includes a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to implement at least the sensor monitoring method described in the foregoing embodiment.
It is to be understood that the foregoing is a more detailed description of the invention, and that specific embodiments are not to be considered as limiting the invention. It will be apparent to those skilled in the art that various substitutions and modifications can be made to the described embodiments without departing from the spirit of the invention, and these substitutions and modifications should be considered to fall within the scope of the invention. In the description herein, references to the description of the term "one embodiment," "some embodiments," "preferred embodiments," "an example," "a specific example," or "some examples" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention.
In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction. Although embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations can be made herein without departing from the scope of the invention as defined by the appended claims.
Moreover, the scope of the present application is not intended to be limited to the particular embodiments of the process, machine, manufacture, composition of matter, means, methods and steps described in the specification. One of ordinary skill in the art will readily appreciate that the above-disclosed, presently existing or later to be developed, processes, machines, manufacture, compositions of matter, means, methods, or steps, that perform substantially the same function or achieve substantially the same result as the corresponding embodiments described herein may be utilized. Accordingly, the appended claims are intended to include within their scope such processes, machines, manufacture, compositions of matter, means, methods, or steps.
Claims (10)
1. A fiber optic sensor, characterized by: the optical fiber comprises a deformation structure and an optical fiber arranged in the deformation structure; wherein the content of the first and second substances,
the deformation structure comprises at least one deformation induction layer, one surface of the deformation induction layer is provided with a convex edge, and the other surface of the deformation induction layer is provided with a sensitization structure at a position opposite to the convex edge;
one end of the optical fiber is connected with the light source, and the other end of the optical fiber is connected with the signal detector;
the sensitization structure comprises a plurality of salient points which are arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on sensitization structure arouses the deformation of deformation response layer, and then conducts deformation to optic fibre through the bead for optic fibre produces the microbending deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter.
2. The fiber optic sensor of claim 1, wherein: a plurality of meshes are arranged on the deformation sensing layer, so that the deformation sensing layer integrally forms a net-shaped structure.
3. The fiber optic sensor of claim 1, wherein: the inner surface of the deformation induction layer is concavely provided with a concave space, and the convex edge is arranged in the concave space; the surface on deformation response layer sets up sensitization structure, the bump sets up on deformation response layer surface corresponding to the position department of bead.
4. The fiber optic sensor of claim 3, wherein: the optical fibers are placed on the convex edges in the concave space in a bending mode, and two ends of the optical fibers are fixed through the wire grooves formed in the inner side of the deformation sensing layer and extend outwards.
5. The fiber optic sensor of claim 4, wherein: the convex ribs are arranged in a linear strip shape or a curve strip shape which is distributed among the meshes, and the cross sections of the convex ribs are triangular.
6. The fiber optic sensor of claim 5, wherein: 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 first deformation sensing layer and the second deformation sensing layer are completely overlapped to form a complete whole after being installed together.
7. The fiber optic sensor of claim 6, wherein: when the first deformation induction layer and the second deformation induction layer are installed and matched together, the convex edges on the first deformation induction layer and the convex edges on the second deformation induction layer are arranged in a staggered mode; the convex ribs on the first deformation sensing layer correspond to the meshes on the second deformation sensing layer, and correspondingly, the meshes on the first deformation sensing layer correspond to the convex ribs on the second deformation sensing layer.
8. The fiber optic sensor of claim 7, wherein: the optical fiber is arranged between the first deformation sensing layer and the second deformation sensing layer; the first deformation induction layer and the second deformation induction layer are in contact with the outside through the surface provided with the sensitization structure, and the surface provided with the convex edge is in contact with the optical fiber through the convex edge.
9. A fiber optic sensor system, characterized by: the optical fiber sensor, the acquisition processing module and the detection module of any one of claims 1-8 are included; wherein the content of the first and second substances,
the acquisition processing module comprises a light source driving circuit, a light source power regulating circuit connected with the light source driving circuit, a light sensation detection circuit, an analog-to-digital conversion circuit connected with the light sensation detection circuit, an optical fiber signal processor and an interaction port; the light source driving circuit is connected with a light source of the optical fiber sensor, and the light sensation detection circuit is connected with the light sensation of the optical fiber sensor; the light source power regulating circuit, the analog-to-digital converter and the sensor interaction port are respectively connected with the optical fiber signal processor;
the detection module comprises an external interaction port and an external processor; the external processor is used for comparing the output value of the light sensation with a preset standard output value, generating a control instruction according to a comparison result and transmitting the control instruction to the optical fiber signal processor through the external interaction port and the sensor interaction port, and the optical fiber signal processor controls the light source adjusting circuit to adjust the light emitting power of the light source according to the control instruction so as to change and adjust the output value of the light sensation.
10. An optical fiber sensor monitoring method is characterized by comprising the following steps:
providing a deformation structure, wherein the deformation structure comprises at least one deformation sensing layer, one surface of the deformation sensing layer is provided with a convex edge, and the other surface of the deformation sensing layer is provided with a sensitization structure at a position corresponding to the convex edge;
arranging an optical fiber in a deformation structure, wherein one end of the optical fiber is connected with a light source, and the other end of the optical fiber is connected with a signal detector;
wherein, the sensitization structure is salient points arranged at intervals; deformation response layer contacts with the external world, and external deformation or pressure act on the bump of sensitization structure, arouse the deformation of deformation response layer, and then conduct deformation to optic fibre through the bead for optic fibre produces little curved deformation, appears the optical power loss, surveys through the signal detector the optical power loss changes the signal of telecommunication into, and is right the signal of telecommunication is handled in order to acquire external variation parameter, accomplishes the monitoring.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138045A (en) * | 2021-04-28 | 2021-07-20 | 东北大学 | Micro-nano optical fiber array stress positioning analysis system |
| CN114264395A (en) * | 2021-11-29 | 2022-04-01 | 重庆金山医疗技术研究院有限公司 | Pressure detection device and method |
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2020
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113138045A (en) * | 2021-04-28 | 2021-07-20 | 东北大学 | Micro-nano optical fiber array stress positioning analysis system |
| CN114264395A (en) * | 2021-11-29 | 2022-04-01 | 重庆金山医疗技术研究院有限公司 | Pressure detection device and method |
| CN114264395B (en) * | 2021-11-29 | 2024-04-30 | 重庆金山医疗技术研究院有限公司 | Pressure detection device and method |
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