113 results about "Fiber bragg grating sensor" patented technology

A robotic surgical system includes one or more robotic actuators configured to interact with biological tissue during a surgical procedure. A plurality of sensors include at least one of fiber Bragg grating sensors, piezoelectric strain sensors, or magnetostrictive sensors to capture real-time mechanical, elasticity, or deformation data from biological tissues. deep learning engine trained on a dataset comprising tissue mechanical responses across multiple tissue types, pathological states, and patient demographics. Pre-contact predictive adjustment profiles are generated for anticipated tissue interactions using preoperative imaging data registered to intraoperative coordinates. Intraoperative deviations are detected from predicted mechanical behavior and autonomously recalibrate actuator forces. Upcoming surgical maneuvers are anticipated based on prior task sequences and adjust actuator stiffness or damping properties in preparation for anticipated contact. An emergency override of actuator forces is provided via an anomaly detection module when real-time sensor data deviates beyond a threshold from the predicted safe mechanical response range. A feedback loop iteratively refines the deep learning engine during the procedure using supervised learning updates, anomaly detection, and reinforcement learning strategies. The reinforcement learning model is optionally shared across procedures to optimize distributed actuator force patterns for minimizing localized and cumulative tissue stress.

The invention discloses a chlorine salt corrosion resistant prestressed concrete solid square pile and a construction method thereof, a cementing material of a pile body concrete body of the square pile comprises a mineral admixture accounting for 50%-70% of the total mass of the cementing material, and the cementing material adopts Portland cement; sacrificial anode blocks electrically connected with the main reinforcements are embedded in the pile body concrete body. The pile body concrete body is doped with a composite corrosion-resistant and rust-resistant agent; the outer surface of the pile body concrete body is coated with polyurea waterproof paint or epoxy seal primer. An electromigration type corrosion inhibitor and a microcapsule containing bacillus are doped into the pile body concrete body; the prestressed main reinforcements are steel reinforcements with anti-corrosion coatings; and fiber bragg grating sensors are pre-embedded around the prestressed main reinforcements. The mixing proportion of the concrete body of the pile body is specially designed for fixing and blocking chloride ions, an inapplicable sulfate-resistant cement scheme is abandoned, and the chlorine salt resistance is improved from the source of materials.

The invention provides an offshore wind power pile foundation scouring real-time monitoring system which comprises an underwater camera, a rotatable scanning sonar, a single-point flow velocity meter, an acceleration sensor, a fiber grating sensor and a data processing transmission unit which are cooperatively used. Synchronous monitoring of the seabed terrain around the pile, the scour depth and range, the ocean current flow velocity and flow direction and the pile foundation vibration response acceleration signal and strain signal is achieved; the data processing and transmitting unit completes collection and fusion analysis of multi-source data and transmits a monitoring result to a land monitoring station in real time. According to the system, collaborative real-time monitoring of multi-element parameters of ocean current-scoured terrain-structural response is achieved, the dynamic evolution law of the seabed terrain is accurately mastered, a dual verification mechanism of directly detecting the scour depth by scanning sonar and inversing the scour depth by structural vibration response is adopted, the scour depth monitoring precision can be greatly improved, and the real-time performance of the system is improved. And reliable data support is provided for long-term safe operation, structural health assessment and scouring protection design of the offshore wind turbine.

The invention discloses an underwater intelligent cable spatial form reconstruction system based on fusion of fiber bragg grating sensing and underwater acoustic positioning, and belongs to the technical field of underwater measurement and sensing. A plurality of fiber bragg grating sensors are inscribed on a three-core fiber in the intelligent cable of the system along the length direction to measure multi-point strain data along the length direction. According to the strain distribution, the bending curvature and the torsion of each measuring point are calculated, a continuous curvature and torsion function is constructed, the tangent vector, the normal vector and the sub-normal vector of each point of the cable are solved in combination with a Freen-Serret algorithm, and the tangent vector is integrated to obtain the space curve form of the cable. And determining the absolute position of the cable terminal in the three-dimensional space according to the acoustic ranging result. And realizing spatial form and attitude recognition of the whole underwater cable through constraint fusion of a curve reconstruction result and an end point position. According to the system, an inertial measurement unit is arranged on a cable to obtain local attitude information, so that the accuracy and the stability of curve reconstruction are improved. The method can be widely applied to space state monitoring of underwater long cable operation.

The invention provides a gradient nano composite high-entropy alloy coating system with a self-monitoring function and a preparation method, and relates to the technical field of material surface engineering.The system comprises a functional gradient coating module used for achieving gradient dispersion distribution of nano ceramic particles on the curved surface of a shield hob so as to form a gradient nano composite high-entropy alloy coating; the fiber bragg grating sensing module is used for collecting strain data of the shield hob through a fiber bragg grating sensor integrated on the shield hob; the surface thermal image monitoring module is used for collecting temperature data and image data of the surface of the shield hob through an infrared thermal imager; and the self-adaptive repairing module is used for determining repairing parameters of the shield hob and generating a repairing instruction, so that self-adaptive repairing is carried out on the shield hob through preset repairing equipment according to the repairing instruction. According to the invention, the sensor network is successfully integrated in the gradient coating, and integrated fusion of structural health monitoring and protection functions is realized.

The invention provides a wafer jacking device and wafer transfer equipment, and the wafer jacking device comprises a supporting plate which is used for supporting a wafer, an optical fiber channel is embedded in the supporting plate, an optical fiber grating sensor is arranged in the optical fiber channel, the optical fiber grating sensor comprises a distributed optical fiber grating array, and the distributed optical fiber grating array is arranged in the optical fiber channel; the number of the fiber grating sensors is three or more than three. The lifting mechanism is used for controlling the supporting plate to ascend or descend, and an accelerometer and a piezoelectric actuator are arranged at the joint of the lifting mechanism and the supporting plate; the fiber bragg grating demodulator is used for receiving and demodulating the reflected light signal of the fiber bragg grating sensor so as to obtain temperature change information; and the vibration controller is used for controlling the piezoelectric actuator to work according to the measurement data of the accelerometer so as to offset the vibration noise. According to the wafer jacking device and the wafer transfer equipment, the surface temperature of the wafer on the supporting plate can be reversely calculated, the problem of uneven contact or pollution during temperature measurement of the wafer is solved, and the temperature measurement precision is improved.

The invention provides a dynamic load-oriented brazed diamond bonding strength testing device and method. The dynamic load-oriented brazed diamond bonding strength testing device comprises a base, a test framework, a self-adaptive sample holding unit, a data acquisition unit and a visual auxiliary alignment unit, the self-adaptive sample holding unit realizes stable clamping and angle adjustment of a sample through a rotatable platform, a translation bottom table, a hydraulic clamping cylinder and an angle adjusting piece; the data acquisition unit acquires a shear force-displacement curve by using a fiber bragg grating sensor, and a high-speed camera records a fracture process; and the vision-assisted alignment unit (high-resolution industrial camera) is used for calibrating the positions of the sample and the pressure head. The method comprises the steps of intelligent pre-characterization clamping, variable load dynamic shear testing, in-situ fracture mode judgment, multi-mode effective fracture area measurement and multi-dimensional strength characterization. According to the invention, the sample positioning and clamping stability is improved, the loading interference is reduced, the interface bonding strength is quantitatively and reliably represented under the dynamic load, and the test accuracy and repeatability are guaranteed.

The invention belongs to the technical field of mining monitoring equipment, and particularly relates to a coal mine hydraulic support displacement monitoring method, a terminal and a storage medium, and the method comprises the steps: deploying fiber bragg grating sensors at a top beam, a base and a stand column of a hydraulic support to collect the three-dimensional strain data of the hydraulic support; based on a pre-stored ICP point cloud registration algorithm, the preprocessed three-dimensional strain data and a hydraulic support CAD model called from a database are fused, and a dynamic three-dimensional scene is generated; and calculating the coordination degree index CSI of the hydraulic support group in real time according to the generated dynamic three-dimensional scene, and triggering early warning when the coordination degree index CSI of the hydraulic support group is smaller than a preset index threshold value. The optical fiber Bragg grating sensors are arranged on the top beam, the base and the stand columns of the hydraulic support, synchronous collection of three-dimensional strain data of the hydraulic support is achieved, and the problems that a traditional ultrasonic range finder is prone to being interfered by dust and large in measurement error are effectively solved.

A method and apparatus for inscribing a high-temperature stable Bragg grating in an optical waveguide, comprising the steps of: providing the optical waveguide; providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 micrometers (μm); providing cylindrical focusing optics; providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intensive to cause permanent (Type II) change in the index of refraction within multiple Bragg grating planes in the core of the optical waveguide resulting from at least one micropore.

The utility model discloses a fiber bragg grating sensor for a wind turbine generator foundation flange bolt, which comprises a gasket, a fiber bragg grating temperature sensor, a fiber bragg grating stress sensor, an optical fiber, an optical fiber connector and an optical fiber adapter, the fiber bragg grating temperature sensor and the fiber bragg grating stress sensor are connected and adhered to the outer circumferential surface of the gasket through optical fibers, the optical fibers are wound on the outer circumferential surface of the gasket, the two ends of the optical fibers are connected with the optical fiber adapter through the optical fiber connector, and the gasket sleeves the bolt and is located below the nut; according to the utility model, the stress connection state of the bolt in the fastening and service process can be accurately and reliably measured and monitored.

The application provides a visual device for rock single fracture solute migration under cyclic temperature variation, comprising: a transparent fractured rock mass, comprising upper and lower transparent fractured rock masses each provided with a rough fracture surface, and the upper and lower transparent fractured rock masses are placed in opposition to form a single fracture channel; a cyclic temperature variation assembly for simulating the cyclic temperature variation phenomenon in a natural environment; a solute concentration monitoring assembly for injecting a fluorescent reagent solution into the single fracture channel, visualizing the solute migration in the single fracture channel based on laser-induced fluorescence, and monitoring the solute concentration in the single fracture channel; a fracture temperature monitoring assembly for monitoring the temperature change inside the single fracture channel under the cyclic temperature variation based on a fiber Bragg grating sensor; and a data processing unit connected with the cyclic temperature variation assembly, the solute concentration monitoring assembly and the fracture temperature monitoring assembly. The application can simultaneously visualize and monitor the solute exchange concentration, flow characteristics and thermodynamic characteristics in the fracture.

The invention discloses an experiment device and method for monitoring side slope soil settlement and deformation based on FBG, and relates to the technical field of civil engineering, and the experiment device comprises a simulation side slope, a settlement and deformation monitoring system, a monitoring system and a data processing system; a drainage water bag is arranged in the simulation side slope, the simulation side slope is further provided with excavation equipment in a matched mode, the drainage water bag is used for simulating sedimentation caused by internal collapse or underground water loss of the simulation side slope, and the excavation equipment is used for simulating the state that the side slope is damaged and unstable due to the fact that the side slope is excavated manually; the settlement and deformation monitoring system comprises an FBG inclinometer and an FBG demodulator, the FBG inclinometer is arranged in the simulated slope and located at the top of the drainage water bag, and the FBG demodulator is used for monitoring and analyzing strain change of an FBG sensor in the FBG inclinometer; the data processing system analyzes and processes the monitored data; the system can provide monitoring and early warning support for slope stability, and has the advantages of real-time monitoring and quick response.

A surgical robotic user input apparatus has a fiber optic cable with a handheld user input device attached at one end, and a connector attached at another end. Multiple intrinsic sensors, such as fiber Bragg grating sensors, are in the fiber optic cable. The intrinsic sensors are used to detect a pose of the handheld user input device. Other embodiments are also described and claimed.

The utility model relates to a refrigerant pipeline stress-strain monitoring system, air conditioning equipment and refrigeration equipment, the refrigerant pipeline stress-strain monitoring system comprises a fiber bragg grating monitoring assembly and a refrigerant pipeline, and the fiber bragg grating monitoring assembly comprises a strain monitoring assembly and a temperature monitoring assembly which are adjacently arranged; the strain monitoring assembly and the temperature monitoring assembly are arranged on the outer wall of the refrigerant pipeline in a contact mode. According to the refrigerant pipeline stress-strain monitoring system provided by the invention, the problem of cross sensitivity of strain and temperature in a fiber bragg grating sensor is solved through the strain monitoring assembly and the temperature monitoring assembly which are arranged adjacently, and the accuracy and reliability of measurement are improved through a temperature compensation or decoupling technology; the actual stress-strain value of the refrigerant pipeline is obtained; the method has the advantages of high strain sensitivity, high measurement precision and the like, and the measurement result is more accurate. As the monitoring position, close to the refrigerant pipeline, of the fiber bragg grating monitoring assembly is of an optical system structure, electric sparks are not generated, and potential safety hazards such as explosion are not generated.

The invention relates to the technical field of optical fiber sensing, in particular to a high-sensitivity space inclination measurement fiber grating sensor and a monitoring method, and the sensor comprises two orthogonally and vertically arranged sensitization type equal-strength beams, the surface of each sensitization type equal-strength beam is provided with a boss and groove combined structure, the center line of each boss is pasted with a fiber grating, and the free end is connected with a mass block. The strain transmission efficiency is improved through cooperative sensitization of the boss and the groove, temperature self-compensation is achieved through the wavelength drift distance difference value of the symmetric fiber bragg grating, and the inclination angles of the yoz plane and the xoz plane can be accurately measured at the same time. The sensor is provided with a waterproof corrosion-resistant protective shell, is high in environmental adaptability, and is suitable for high-precision space inclination monitoring of projects such as bridges and side slopes.

The utility model relates to the technical field of detection module, especially for the multimode detection module for vehicle lithium battery, including multispectral imager, two multispectral imager respectively are established in the top both sides of metal frame, the inside of metal frame is equipped with a plurality of battery group, the inside of battery group is equipped with a plurality of electric core, the top of electric core is pasted with fiber bragg grating sensor, the top of battery group is equipped with three NTC film thermocouple. The support rod in the device is obliquely installed on both sides of the metal frame, which can optimize the viewing angle of the two multispectral imagers, so that the battery group can be fully covered to eliminate dead angles. The hydrogen sensor is embedded in the contact side of the battery group, which can capture combustible gas leakage in real time to speed up the early warning. The design of the protective shell can provide physical protection for the electric core and ensure the surface of the NTC film thermocouple to measure temperature. The three NTC film thermocouples are distributed on the top front, middle and back of the protective shell, which can monitor the temperature gradient and accurately locate the overheating.

The application discloses a UHPC anti-bending test initial cracking strength determination method and system based on an image method, and belongs to the technical field of mechanical property testing, and comprises the following steps: spraying random speckles on the surface of a UHPC test piece, pre-embedding an optical fiber Bragg grating sensor array in the test piece, and performing X-ray computed tomography on test pieces in the same batch to establish a fiber-matrix interface transition zone damage evolution model; when three-point anti-bending loading is performed on the test piece, surface speckle images are collected in real time, the DIC algorithm is used to calculate the full-field strain distribution, and the surface initial cracking time and the strain concentration area coordinates are determined in combination with a criterion; meanwhile, the wavelength drift of the optical fiber is monitored, the internal initial cracking time is determined by calculating the coefficient of variation; the interface debonding rate and the interface initial cracking point time are calculated according to the model and the real-time interface stress; a multi-source initial cracking characteristic data set containing the surface strain, the internal strain anomaly and the interface debonding rate is constructed, the weight coefficients are obtained by inputting the neural network model, and the initial cracking anti-bending strength is calculated by weighted summation.

The invention relates to the technical field of constructional engineering detection, and provides a hydraulic climbing frame aisle load detection system and method, and the system comprises a fiber grating sensor, an optical fiber, a processing module, a fixing device, a fiber grating access port, and a load detection module. The fiber bragg grating sensor detects whether the free end of the adjustable floor supporting beam deforms or not; the processing module sends optical signals to the fiber bragg grating sensor regularly through optical fibers, the fiber bragg grating sensor receives the optical signals and then converts physical quantity of the free end of the adjustable floor supporting beam into optical signals and transmits the optical signals to the processing module, and the processing module obtains strain data and transmits the strain data to the load detection module for load calculation. And when the calculation result is overload, the load detection module judges an overload area and notifies the processing module to carry out visual shooting on the overload area, then the shooting result is sent to the load detection module, and prompt processing is carried out through the load detection module. According to the invention, unmanned detection of the aisle load of the hydraulic climbing frame can be realized.

The application provides a fiber underwater robot posture sensing device and method. The device comprises a plurality of fiber Bragg grating sensors, a base, flexible silica gel, an omnidirectional rotatable transmission shaft, a spring and a stress sensing ball, the plurality of fiber Bragg grating sensors are embedded in the flexible silica gel; the flexible silica gel is placed in a circular base and transmits the force in the vertical direction of the stress sensing ball to the plurality of fiber Bragg grating sensors as a medium; the base is separated from the lower rotatable transmission shaft; the omnidirectional rotatable transmission shaft, the spring and the stress sensing ball form an elastic linkage system. The device is installed on the upper surface of the robot, when the posture of the robot deviates, the elastic device connected by the spring and the stress sensing ball slides on the entire flexible silica gel, the stress sensing ball extrudes the flexible silica gel, thereby causing the wavelength of the fiber Bragg to change, and the position of the stress sensing ball can be obtained by using a posture analysis model based on deep learning, so that different postures of the robot can be sensed.

The application discloses an oil and gas pipeline corrosion condition monitoring device and method. The oil and gas pipeline corrosion condition monitoring device comprises a plurality of metal bases, which are suitable for being fixed on the outer wall of an oil and gas pipeline and are arranged at intervals along the length extension direction of the oil and gas pipeline; a plurality of flexible strips, which are arranged in one-to-one position correspondence with the plurality of metal bases, the two ends of the flexible strips being connected to the position-corresponding metal bases, the plurality of flexible strips being in a stress state under the action force of the metal bases; a plurality of fiber Bragg grating sensors, which are installed in a one-to-one correspondence on preset positions on the flexible strips, the plurality of fiber Bragg grating sensors being connected to a demodulator through optical fibers; and the demodulator being suitable for receiving optical signals fed back from the plurality of fiber Bragg grating sensors and generating a fault signal containing position information of the corresponding fiber Bragg grating sensor when the optical signal fed back by any one of the fiber Bragg grating sensors is abnormal. The oil and gas pipeline corrosion condition monitoring device disclosed by the embodiment is high in efficiency and low in cost.

The invention discloses a dexterous hand force tactile sensor structure, which belongs to the technical field of tactile perception of robot dexterous hands, and comprises a first force arm, a second force arm, a contact slide rail and a fiber grating sensor, distances between hinge points of the first force arm and the second force arm and same-direction ends of the first force arm and the second force arm are equal; one side of the first force arm and one side of the second force arm are slidably connected with the contact sliding rail and correspondingly connected with the two ends of the elastic element. The fiber grating sensor is connected with the other sides of the first force arm and the second force arm; according to the invention, the fiber grating is used as a core sensitive element, and the two ends of the fiber grating sensor are synchronously triggered by matching the two force arms which are arranged in a crossed manner with the contact slide rail, so that the problems of large size, poor durability, easy interference, poor precision and the like of a traditional electrical sensor in dexterous hand application are solved.

The invention provides a method for connecting a fiber bragg grating and a metal pressure sensing cavity, and relates to the technical field of fiber bragg grating sensors, and the method comprises the steps: laying a brazing filler metal on the side wall of the metal pressure sensing cavity, placing the fiber bragg grating on the brazing filler metal, and then carrying out the brazing, thereby obtaining a fiber bragg grating sensor; wherein the brazing filler metal is silver-based brazing filler metal or gold-based brazing filler metal. The fiber grating sensor obtained by the method can stably work for a long time in a high-temperature (250-400 DEG C) environment.

The utility model relates to the field of fiber grating sensors, in particular to a fiber grating sensor. Comprising two mounting frames, sensing parts are mounted on the inner walls of the two mounting frames, optical fiber cables are mounted at the two ends of each sensing part, adjusting structures are arranged on the arc surfaces of the two optical fiber cables, each adjusting structure comprises a circular ring, the circular rings are movably connected with the optical fiber cables, and fixing frames are fixedly connected to the outer arc surfaces of the circular rings. A cover frame is rotatably connected to the inner wall of the fixing frame, a limiting rod is inserted into the side, away from the fixing frame, of the cover frame in a threaded mode, the arc face of the limiting rod is slidably connected with the fixing frame, and a plurality of storage grooves are formed in the surface of the fixing frame. The fiber bragg grating sensor provided by the utility model has the advantages that the fixing frame is matched with the elastic band and the cover frame to accommodate the redundant part of the optical fiber cable, a user can conveniently manage the optical fiber cable, and the optical fiber cable is prevented from being wound and damaged.

The invention discloses a system and method for detecting the tightness of a track bolt, and relates to the technical field of track detection, and the method comprises the steps: constructing a stress guide structure through topological optimization, embedding a fiber Bragg grating sensor in a stress concentration region and a main force conduction path region, and forming the distribution structure data of the fiber Bragg grating sensor; performing multi-stage loading calibration on the distributed structure data of the fiber bragg grating sensor by adopting a static loading experiment method, establishing a nonlinear function mapping relation between wavelength response and bolt pre-tightening force, and forming a calibration function model; a spectrum demodulation technology is adopted, wavelength changes of the fiber bragg grating sensor in the train running state are collected in real time and input into the calibration function model for real-time calculation, and a real-time pre-tightening force value data set is formed. According to the invention, the accuracy and reliability of data acquisition are improved, and the precision and stability of subsequent pre-tightening force identification are significantly improved.

The invention relates to the technical field of wing built-in fuel cabins, in particular to a wing integrated ultralight hydrogen storage cabin and a leakage self-blocking system thereof, cabin section matching is carried out on the internal and external pressure difference of a sealing layer, the temperature difference of a heat insulation layer and a strain value of a force bearing layer, adjacent difference values are calculated in a serial number sequence, and a difference value record is formed by combining a temperature difference recombination time sequence; the structure and thermal state of different cabin sections can be comprehensively positioned, the monitoring precision is improved, the high-risk cabin sections are screened through the difference value proportion and are associated with the positions of the bearing layers and the nodes of the fiber bragg grating sensors, accurate locking of key parts is achieved, unnecessary intervention is reduced, heat energy dispatching and environmental conditions are closely combined, and the reliability of the system is improved. The abrupt change cabin section is identified on the basis of the liquid level and lift force distribution table, the shape memory alloy wire is combined to control coordinates for heating triggering, and the system safety, the response speed and the energy utilization efficiency are improved under the cooperation of monitoring, judging and executing links.

The invention relates to the technical field of fan blade operation monitoring, and discloses a fan blade life prediction and fault early warning method based on digital twinning. A fiber bragg grating sensor is pre-embedded in a blade girder cap fiber layer, an acceleration sensor is arranged at a blade root, and multi-source data is collected by combining a wind speed sensor, a rotating speed sensor and a pitch angle sensor; establishing a blade finite element digital twinborn model, and realizing stress field dynamic assimilation in combination with pneumatic-structure coupling simulation and extended Kalman filtering; calculating fatigue residual life based on rain flow counting, an S-N curve and a Miner theory, evaluating crack propagation life by adopting a Paris model, and taking a minimum value of the fatigue residual life and the crack propagation life as comprehensive life; and further constructing a dynamic safety threshold considering wind speed fluctuation, environment temperature and operation time, and triggering early warning when the comprehensive life is less than or equal to the threshold. According to the invention, accurate prediction and real-time early warning of the service life of the blade can be realized, and the problems of insufficient monitoring coverage, incomplete service life evaluation and fixed threshold are solved.

The invention discloses an ecological restoration device for a three-dimensional latticed marine ranch, which belongs to the technical field of marine ecological engineering and comprises a net cage frame, a biological filtration module, a nutrient solution supply module and a plurality of sensor systems. The biological filtration module consists of an algae agglutination unit and a shellfish filtering unit and is used for purifying water. A tension sensor and a fiber grating sensor array are arranged on the net cage frame, structural stress changes can be monitored in real time, the damaged position of the netting can be accurately positioned, if damage is detected, the system releases humic liquid through a micro valve, plankton and small fishes are attracted to gather, algae and microorganisms are promoted to adhere and grow at the damaged position, and a biological barrier is formed; the self-repairing of the netting is realized. In addition, the device integrates functions of shellfish behavior monitoring, netting cleaning, pH adjusting and the like, so that the ecological restoration efficiency and the system reliability are improved, and the device is suitable for ecological maintenance and culture management of marine ranches.

The application provides a large-aspect-ratio wing bending and torsion deformation dynamic monitoring method which can be used in actual engineering. The method comprises the following steps: installing fiber Bragg grating (FBG) sensors and torsion strain gauges on a large-aspect-ratio wing girder; measuring bending and torsion strains by using the FBG sensors and the torsion strain gauges; establishing a strain-displacement relationship model, and determining the geometric parameters required by the strain-displacement relationship model through experiments; and calculating the deformation of the large-aspect-ratio wing in actual flight by using the strain-displacement relationship model and the real-time measured strain data. The application can avoid the influence of external environmental factors on the measurement. In addition, by combining the use of the torsion strain gauges, the flexibility of arranging the measuring points is improved, so that the measurement system can adapt to beams with different geometrical shapes, and is particularly suitable for unmanned aerial vehicles with large-aspect-ratio wings in actual engineering, and can realize the measurement of the dynamic response of the large-aspect-ratio wing in actual flight state in a complex flight environment.

The invention provides a mold for casting molding of an optical fiber coupling intelligent buoyancy material and a method for preparing the optical fiber coupling intelligent buoyancy material. Through the design of the mold structure and the embedded part structure for casting molding of the optical fiber coupling intelligent buoyancy material, the leading-out mode of the optical fiber grating sensor is optimized, and the problem that the surface of the optical fiber coupling intelligent buoyancy material is difficult to cut and process is effectively solved; and the fiber grating sensor led out from the surface of the buoyancy material can be prevented from being damaged in the process of detaching the buoyancy material from the mold and the cutting process. The surface of the optical fiber coupling intelligent buoyancy material is smooth and crack-free after cutting processing, and the water absorption rate is less than 1.00% after a hydrostatic pressure test at 116MPa for 24h; meanwhile, the fluctuation of central wavelength signals corresponding to the grating of the fiber grating sensor before and after cutting processing is small, and the fiber grating sensor can still transmit internal wavelength change signals after cutting processing.

The invention relates to a device (102, 402, 502, 602, 702, 802) for generating a signal (103) for illuminating a fibre Bragg grating (101) in a fibre Bragg grating sensor (10), in particular for detecting traction axes, wherein the device (102, 402, 502, 602, 702, 802) comprises a pump laser (109), a laser medium (110), in particular an erbium-doped fibre amplifier, and a chirped fibre Bragg grating (111), wherein the pump laser (109) is designed to pump the laser medium (110) for emitting light, wherein the chirped fibre Bragg grating (111) is designed to reflect a portion of the light into the laser medium (110), wherein the laser medium (110) is designed to amplify the portion of the light for the signal (103) for illuminating the fibre Bragg grating (101) in the fibre Bragg grating (10). The invention also relates to a method for generating the signal (103).