170 results about "Fiber sensor" patented technology

The invention relates to the technical field of distributed optical fiber acoustic sensors, in particular to a distributed optical fiber sensor vibration identification method and system, and the method comprises the steps: obtaining original data, and carrying out the preprocessing; inputting the preprocessed vibration time sequence into a Mamba model, and extracting a time domain feature vector reflecting a time evolution rule; after obtaining a time-frequency spectrogram of the preprocessed vibration time sequence, extracting to obtain a frequency domain feature vector representing different frequency components and a global association relationship thereof; inputting the time domain and frequency domain feature vectors into a time-frequency feature fusion model, and outputting a vibration event recognition result of the distributed optical fiber acoustic sensor; training the time-frequency feature fusion model, and storing the optimal model weight for prediction; and performing prediction by using the optimal model, storing a prediction result, performing verification, calculating an evaluation index, and finally performing result comparison. The invention aims to solve the problems of insufficient performance and the like of a distributed optical fiber acoustic sensing technology in the prior art.

The invention relates to the technical field of hydraulic test of nickel alloy pipes, and discloses a hydraulic test system for a thin-wall nickel alloy pipe. According to the system, in the axial loading state of the thin-wall nickel alloy pipe, a closed water pressure cavity is established through an annular sealing clamp, and then strain distribution data on the surface of the pipe body is collected through a distributed optical fiber sensor array. And constructing a three-dimensional stress field reconstruction model based on the acquired strain distribution data, calculating an equivalent plastic deformation threshold value of the pipe body under different water pressure gradients, adjusting a water pressure loading curve slope parameter according to the equivalent plastic deformation threshold value, and generating a dynamic water pressure loading instruction. And the high-frequency pressure pulse generator executes the instruction, synchronously triggers the X-ray diffractometer to collect lattice distortion data of the tube body, inputs the data into the material microscopic damage evolution model, and outputs a microscopic defect spatial distribution map. And finally, material constitutive parameters of the three-dimensional stress field reconstruction model are corrected based on the atlas, closed-loop feedback control is formed, and multi-dimensional data acquisition and accurate management and control of the thin-wall nickel alloy pipe hydrostatic test are achieved.

The invention belongs to the technical field of geological engineering monitoring and multi-physics field intelligent sensing, and discloses a separation grouting slurry migration monitoring method and system, and the method comprises the steps: constructing an acoustics-optics-electricity-electromagnetism multi-physics field coupling monitoring system; a grouting hole and a monitoring drilling hole array are arranged in a target stratum, a distributed optical fiber sensor, a drilling hole ultrasonic imager, a resistivity measuring device and a transient electromagnetic detection device are installed, and a three-dimensional monitoring network is formed; synchronously acquiring sound field, light field, electric field and magnetic field data; four-field monitoring data and overlying strata multi-parameter observation data are fused, a coal seam mining three-dimensional overlying strata separation model is constructed, and a slurry diffusion three-dimensional visualization model is generated through numerical simulation; and based on the four-field monitoring response difference of the separation space before and after grouting, in combination with a monitoring frequency domain correction model of multiple indexes of grout diffusion, the diffusion range, compactness and filling effect of the grouting grout are evaluated, and abnormal early warning is triggered.

The invention discloses a detection system for water level data and geological data of a weakly cemented coal seam, and belongs to the technical field of mine safety monitoring. Comprising a hardware layer and an algorithm layer, the hardware layer constructs a water surface-water body-water bottom three-in-one dynamic monitoring system, and the algorithm layer fuses multi-source data through a physical information neural network to realize global water bottom DEM inversion and dynamic early warning. And the physical information neural network inverts the global underwater DEM in a data driving item and physical driving item joint optimization mode by performing space-time alignment on the sonar point cloud, the unmanned aerial vehicle water level data and the optical fiber strain gradient and then performing weighted fusion. Sonar, optical fiber and water level data are fused through a PINN model, the crack recognition capacity is improved, and the side-scan sonar can detect cracks with the width larger than or equal to 2 cm; second-level data acquisition is achieved through the optical fiber sensor, the water inrush early warning response time is shortened, the response speed is increased, and the sonar sounding error is still controlled within 5 cm. The system robustness is increased, and the double-ring optical fiber network reduces the single-point fault influence range.

The utility model discloses a rubber dredging pipe with high stability, which comprises a pipe part main body, and the pipe part main body is provided with a rubber lining layer, a woven carbon fiber layer and a coated outer rubber layer; the multiple sections of reinforcing rings are arranged on the outer circle of the pipe part main body, each reinforcing ring is provided with a protruding pile head part, each pile head part is provided with an inner cavity leading to the wall face of the pipe part main body, and the inner cavities are used for installing optical fiber sensors and monitoring stress, temperature and deformation parameters of the pipe part main body; and the radian fins are arranged on the surface of the pipe part main body and are spaced from the reinforcing ring. The pipe part main body of the dredging pipe is formed by the rubber lining layer, the carbon fiber layer and the outer rubber layer, so that the dredging pipe is good in wear resistance and pressure resistance. The reinforcing ring improves the strength of the pipe part main body, and the pile head part can accommodate and install an optical fiber sensor, so that real-time monitoring of the dredging pipe is realized. The radian fins are distributed on the surface of the pipe part body, guiding can be improved, direct pressure caused by impact of water flow and sediment is reduced, and internal flow resistance is prevented from being affected.

The invention belongs to the related technical field of sensors, and provides a multi-parameter integrated acquisition optical fiber sensor and a monitoring system thereof in order to solve the problem that high-precision monitoring of a static signal and a dynamic signal is difficult to consider by an existing sensor at the same time, a sensing cavity is sequentially divided into a static signal sensing area and a dynamic signal sensing area in the axial direction; the static signal sensing area adopts a multi-core fiber, fiber gratings are respectively engraved on the multi-core fiber, and the wavelength demodulation of the static signal is realized through the central wavelength drift distance of the fiber gratings; the dynamic signal sensing area is provided with a dynamic signal sensing unit, the dynamic signal sensing unit comprises F-P air microcavities formed between the dynamic signal sensing unit and the end faces of all fiber cores of the multi-core optical fiber, and intensity demodulation of dynamic signals is achieved through cavity length changes of the F-P air microcavities. According to the invention, a wavelength modulation and intensity modulation parallel composite demodulation mechanism is adopted, and decoupling acquisition of static strain, temperature and dynamic vibration is realized in a single sensor.

The invention discloses an optical fiber sensor high-speed demodulation device based on a cascaded Mach-Zehnder interferometer, which adopts a two-stage cascaded Mach-Zehnder interferometer structure, and obtains four-channel output with equal central wavelength intervals by accurately aligning two-stage central wavelengths. And the four-channel signal is utilized to carry out orthogonal demultiplexing on a spectral signal of the optical fiber sensor. In a digital domain, an orthogonal demodulation algorithm for phase demodulation of an optical fiber sensor is provided, and the demodulation speed is only limited by a digital sampling rate. Compared with a traditional spectrum demodulation algorithm, the scheme has the advantages of being high in demodulation speed, wide in working frequency band, easy to implement and the like.

The invention relates to the technical field of bionic electronic skin and flexible sensing materials, in particular to an AF / rGO fiber tactile system and method.The AF / rGO fiber tactile system and method.The AF / rGO fiber tactile system and method are specifically characterized in that aramid 1414 fibers are adopted as a base material, subjected to ultrasonic cleaning and then repeatedly soaked in a graphene oxide solution, a graphene oxide coating is loaded on the surface of the aramid 1414 fibers, and the AF / rGO fiber tactile system is obtained; reducing into a graphene oxide coating by utilizing steam reduction, and performing hot pressing synergism to prepare an AF / rGO fiber sensor; the piezoresistive and thermosensitive effects of the fiber are utilized, the fiber serves as a core material of the sensor and is connected with two electrodes to be assembled into the sensor, mechanical and temperature stimulation is converted into resistance signal change, and the pressure and temperature sensing capacity of the skin is simulated through multi-mode fusion and signal processing. Based on the contact resistance dynamic response of the micro-scale structure, combining a neural network algorithm to realize fabric recognition and gesture recognition; and meanwhile, fire early warning is triggered through temperature resistance signal change by utilizing the flame-retardant characteristic of the aramid fiber substrate.

The present application relates to the technical field of distributed optical fiber acoustic sensor, and particularly relates to a distributed optical fiber sensor vibration identification method and system, comprising obtaining original data and preprocessing; inputting the preprocessed vibration time sequence into a Mamba model to extract a time domain feature vector reflecting the time evolution law; obtaining a time-frequency spectrum of the preprocessed vibration time sequence to extract a frequency domain feature vector representing different frequency components and their global correlation; inputting the time domain and frequency domain feature vectors into a time-frequency feature fusion model to output a vibration event identification result of the distributed optical fiber acoustic sensor; training the time-frequency feature fusion model, saving the optimal model weight for prediction; using the optimal model for prediction, saving the prediction result, verifying, calculating the evaluation index, and finally comparing the results. The present application aims to solve the problems of insufficient performance of the prior art distributed optical fiber acoustic sensing technology.

The invention discloses an optical fiber sensor intergenerational operation device and method for concrete surface monitoring, and relates to the technical field of structural health monitoring. According to the device, a multi-layer sensor groove nesting design is adopted, and a closed space is constructed on the surface of concrete through a cover plate, sensor grooves and screws so as to accommodate an optical fiber sensor. The method comprises the following steps: presetting a calibration reference in an initial system, performing parallel operation and data acquisition when a new sensor is deployed, establishing a mapping relationship between data of the new sensor and data of the old sensor, and performing data fusion by using the relationship. Through physical structure nesting and data calibration mapping, the problems of monitoring interruption and discontinuous multi-generation sensor data caused by limited service life of the sensor are solved, inter-generation and long-period continuous monitoring of parameters such as surface strain and temperature of the concrete structure is realized, and the effective service life of a monitoring system is remarkably prolonged.

The present application relates to a kind of carbon fiber composite material nondestructive testing methods based on piezoresistive nanofiber sensor, it includes the following steps: 1), preparation spinning solution;2), build electrospinning platform;3), preparation high frequency response piezoresistive nanofiber sensor;4), high frequency response piezoresistive nanofiber sensor is embedded in carbon fiber composite material board;5), to the carbon fiber composite material board vibration response test and ultrasonic guided wave test, to detect the damage condition of carbon fiber composite material board.The present application can guarantee that fiber sensor is embedded in carbon fiber composite material board, can guarantee that the nondestructive testing of carbon fiber composite material is realized under the premise of not affecting the mechanical properties of carbon fiber reinforced composite and not occupying carbon fiber composite material surface space.

The invention relates to the technical field of roadbed engineering monitoring, in particular to a roadbed engineering settlement deformation monitoring device and method, and the device comprises an optical fiber sensor network, a data collection module, a signal processing module, a model matching module, a frequency analysis module, a data fusion module, an early warning trigger module and a prediction report module. The optical fiber sensor network is deployed in a roadbed to collect an optical signal delay sequence, fluctuation characteristics are extracted through data collection and signal processing, settlement acceleration risks are judged through model matching, the speed trend is determined through frequency analysis, historical and real-time data are integrated through data fusion, an alarm is triggered when an early warning module exceeds a threshold value, and a risk assessment report is generated through a prediction module. According to the device, roadbed three-dimensional global monitoring and full-process automation are achieved, monitoring blind areas are eliminated, early warning lag is shortened, and accurate support is provided for roadbed stability operation and maintenance.

The utility model discloses a separate air cylinder and double-floating structure combined material taking and placing mechanism, and relates to the technical field of automatic manufacturing. The device comprises a stroke-adjustable air cylinder, an air cylinder deep hole hollow guide shaft, a spring floating mechanism guide shaft, a first spring floating structure, a first linear bushing, a second linear bushing, an air cylinder connecting column, an electromagnet fixing plate set, an electromagnet, a second spring floating mechanism and a second spring floating structure limiting bolt. And a product identification optical fiber sensor, a light collecting mirror and a cylinder rising in-place sensor. Through large-stroke buffering of the first spring floating structure and short-stroke avoiding of the second spring floating structure, the problems of product suction plane height errors and mold obstacle collision are solved, a clamp and a mold are protected, and equipment reliability is improved; large-stroke swing errors are eliminated, and the steel billet placing precision is remarkably improved; and 8-cavity and 12-cavity mold clamps are adapted, so that quick switching of small-batch order models is realized, and the cost is saved.

The invention relates to a multi-stage safety protection storage tank for liquid oxygen storage, which relates to the technical field of low-temperature liquid storage equipment, and comprises a storage tank main body, a main pressure release valve, an auxiliary pressure release valve, a discharge pipeline, a filling pipe and an access hole. The high-purity liquid oxygen storage device has the effect of ensuring that high-purity liquid oxygen is safely stored in a high-pressure, flammable and explosive environment. The storage tank body is arranged and comprises the outer wall and the inner container, the optical fiber sensor is arranged on the outer side of the inner container, the flow guide fins are arranged on the inner wall of the inner container, intelligent monitoring and static elimination can be conducted, the main pressure release valve and the auxiliary pressure release valve are arranged at the top end of the storage tank body, and graded rapid pressure release can be achieved; the outer side of the filling pipe is connected with a guide strip, an inspection mechanism, a movable sleeve, a rotating mechanism and other assemblies, under the mutual cooperation, the filter screen can be inspected and replaced under the conditions of no shutdown and no emptying of the storage tank, and the operation safety and efficiency are effectively improved.

The utility model discloses a kind of seabed carbon sequestration simulation detection devices combined with optical fiber sensor, including simulation box, gas delivery cover and controller, simulation box is provided with silt deposition model, detection optical fiber and propeller water sprayer, deposition model is fixedly installed in the inner end face bottom of simulation box, detection optical fiber is evenly distributed in silt deposition model, propeller water sprayer is evenly installed in simulation box, gas delivery cover includes flow guide cover and carbon dioxide cylinder, the inside of flow guide cover is hollow structure, through connection gas pipe is provided between flow guide cover and carbon dioxide cylinder, gas delivery cover is installed in the top of simulation box, controller is fixedly installed in the outside of simulation box. The utility model solves the low monitoring precision of traditional seabed carbon sequestration simulation detection device, poor system integration and difficult to restore deep sea environment.

The present application relates to a kind of pick assembly with wear sensing device, drum and coal winning machine, including pick collar, pick, fiber sensor and data acquisition equipment, pick is fixedly connected with pick collar by snap ring;Pick includes tooth head and pick matrix, tooth head is installed in the end surface recess of pick matrix, installation hole is opened along the central axis of pick matrix and tooth head, installation hole penetrates pick matrix and extends into tooth head;Fiber sensor is implanted in installation hole, tail end of fiber sensor is fixedly encapsulated with pick collar;Data acquisition equipment is communicatively connected with tail end of fiber sensor, and real-time sends the wear signal collected to monitoring terminal.Pick head and pick matrix can be effectively measured wear curve in time, realize the real-time tracking of pick wear state continuous change, assess the wear performance of pick and predict the abnormal damage of pick.

The invention discloses a ground subsidence and ground fracture optical fiber sensor and an installation method, and the method comprises the following steps: S1, drilling and optical fiber position determination: determining the position of an optical fiber grating in the optical fiber sensor according to a drilled rock core, and determining the proportion of pouring cement according to the components of the rock core; s2, processing the sensing optical fiber: roughening the surface of the sensing optical fiber, and arranging annular cards with openings on the sensing optical fiber at certain intervals; s3, mounting rods and balancing weights, wherein the balancing weights are arranged at the top ends of the mounting rods; s4, an unlocking device is adopted, specifically, in the cement pouring process, the balancing weight is unlocked through the unlocking device; and S5, lowering the sensing optical fiber and pouring cement: according to the mounting condition of the sensing optical fiber, fixing the top end of the sensing optical fiber on a balancing weight or performing arc bending, lowering the sensing optical fiber through a mounting rod, then connecting the mounting rod step by step, injecting cement with different parameters according to the acquired parameters of the rock core, and lifting the mounting rod upwards in the injection process.

The present application discloses a fiber optic sensor and a measurement method, apparatus, and storage medium. By performing, based on the microwave signal, intensity modulation on the optical signal, then inputting the modulated optical signal into the fiber optic containing the weak reflection grating array, a reflected signal is obtained. Thereafter by performing dispersion compensation on the amplified partial reflected signal, and based on the dispersion-compensated reflected signal and the non-dispersion-compensated reflected signal, the change amounts respectively corresponding to positions in the fiber optic containing the weak reflection grating array are determined.

The invention discloses an underground temperature and pressure monitoring system and method, a storage medium and an electronic device, and the system comprises an optical fiber sensor, a signal transmission optical cable, and a demodulator. Wherein the optical fiber sensor is deployed at a preset underground position and is used for monitoring underground environmental parameters, and the environmental parameters at least comprise a pressure parameter and a temperature parameter; wherein the signal transmission optical cable is arranged between the optical fiber sensor and the demodulator and is used for transmitting environmental parameters to the demodulator; wherein the demodulator is used for analyzing the environmental parameters received from the signal transmission optical cable into monitoring data corresponding to the environmental parameters, and the monitoring data at least comprises readable pressure values corresponding to the pressure parameters and readable temperature values corresponding to the temperature parameters. The problem that in the petroleum and natural gas industry, monitoring equipment adopted in a traditional downhole operation monitoring scheme has the defects of poor reliability, high maintenance cost and the like, and consequently the traditional downhole operation monitoring scheme has limitation is solved.

The utility model discloses an online length measuring device in cable production process relates to cable production detection equipment technical field, including mounting bracket, compression wheel, guide wheel, measuring wheel and detection device, the compression wheel horizontal interval rotation is installed on the mounting bracket, and the guide wheel and measuring wheel rotation are installed on the mounting bracket, and the compression wheel is formed with the guide wheel, measuring wheel between the clamping gap for the cable of passing through to be measured, and the gap is less than the cable diameter to be measured, measuring wheel is fixedly connected with the pivot of detection device, and the cable to be measured moves through friction force and drives the rotation of measuring wheel, and detection device converts the rotation of measuring wheel into length data, the mounting bracket still is equipped with the calibration device including static generator, fiber sensor no.

The application provides a fiber sensor for high-frequency vibration detection, comprising a sensor diaphragm which is a deflected-hole fiber sensor diaphragm or a deflected-slot fiber sensor diaphragm, and a single-mode optical fiber, a light source, a circulator, an amplifier and a collection card connected in sequence; the deflected-hole fiber sensor diaphragm and the deflected-slot fiber sensor diaphragm are formed by presetting a plurality of holes or arc-shaped slots on the diaphragm which are not overlapped with the geometric center of the diaphragm and are symmetrically distributed, then the plurality of holes or arc-shaped slots are collectively deflected relative to the geometric center of the diaphragm, so that the holes or arc-shaped slots on the diaphragm finally present an asymmetric structure. The sensor device has the characteristics of high sensitivity, strong anti-interference ability and convenient production, and greatly increases the range of frequency domain response compared with the sensor made of the traditional diaphragm.

The invention discloses a solid welding wire high-precision oil dripping quantity measurement control method and device, and relates to the technical field of oil quantity detection.The method comprises the steps that after oil output from an oiling device is output through a spray head assembly connected to the lower portion of the oiling device, the oil passes through an optical fiber sensor detection mechanism below the spray head assembly; the current oil dripping amount is detected through the optical fiber sensor detection mechanism; the PLC judges the actual oil dripping amount needed by the welding wire according to the welding wire size, the wire feeding meter number and the wire feeding speed; and the PLC adjusts the output flow in the oiling device in real time according to the required actual oil dripping quantity, so that the current oil dripping quantity is matched with the required actual oil dripping quantity.

A device may receive, from a fiber sensor device, sensing data associated with a fiber optic cable, the sensing data being produced by an activity that poses a threat of damage to the fiber optic cable, and the sensing data identifying: amplitudes of vibration signals, frequencies of the vibration signals, patterns of the vibration signals, times associated with the vibration signals, and locations along the fiber optic cable associated with the vibration signals. The device may process, with a machine learning model, the sensing data to determine a threat level of the activity to the fiber optic cable, the machine learning model having been trained based on historical information regarding detected vibrations, historical information regarding sources of the detected vibrations, and historical information regarding threat levels to the fiber optic cable. The device may perform one or more actions based on the threat level to the fiber optic cable.

A novel, two-stage Distributed Fiber Optic Sensor (DFOS) placement strategy and method that ensures resilient monitoring of critical infrastructure during electrical power supply failures. This strategy and method combines a heuristic algorithm, PURE (Power Source-aware Route Exploration), with Integer Linear Programming (ILP) optimization. The PURE algorithm explores potential DFOS routes while explicitly considering the dependency of DFOS devices on the electrical power distribution network, ensuring routes electrically powered by the same electrical power feeder are disjoint. Subsequently, the ILP selects the optimal set of DFOS placements to minimize the total number of deployed sensors while meeting critical infrastructure monitoring requirements, such as redundant monitoring for high-importance links. The method enhances the observability of critical links, achieving 100% monitoring coverage for important links during simulated power outages affecting an electric feeder.

The application discloses a bladder pressure closed-loop control system and method with a fiber-optic sensor magnetic suction interface, and belongs to the technical field of medical devices. The application sets an independent backward-inclined fiber-optic sensor magnetic suction interface in a holding dead zone of a proximal end hub of an inner sheath, and guides the fiber-optic sensor to a distal end through a metal microtube welded by a laser in a wall of the inner sheath; a "metal-ceramic composite reinforcement" structure is adopted to embed a fiber-optic Fabry-Perot pressure sensor in a lateral wall of a ceramic beak, and an induction diaphragm of the sensor is configured to face away from a central flow passage of the inner sheath and face a radial periphery of the ceramic beak; the layout realizes complete decoupling of a monitoring path and a surgical execution path in a physical space, and guarantees in-situ and real-time monitoring of intravesical pressure in a strong electromagnetic interference environment. Meanwhile, a millisecond active pressure relief is triggered by a system host when pathological spasm is monitored, and a pressure-time integral (PTI) is calculated in real time to quantify a liquid absorption risk.

The invention relates to the field of biochemical sensing, in particular to a nucleic acid aptamer biosensor, an optical fiber sensor and cell detection application. The nucleic acid aptamer biosensor comprises a matrix, a connecting structure and TDN-coated AuNP, the matrix and the TDN-coated AuNP are combined through the connecting structure, and the connecting structure is an amino group, PolyA or a functionalized complementary chain. Through a special tetrahedral nanogold structure, the problem that nanogold is gathered due to the fact that the surface of the matrix is modified with nanogold is solved, and the biosensor has a good application prospect. Therefore, high-sensitivity detection is realized, and the method has extraordinary significance in the whole LSPR field.

The application discloses a film winding device, which comprises a mounting frame, a film feeding mechanism, a profiling pressure roller mechanism, a film taking mechanism, a film clamping mechanism and a film winding mechanism are arranged on the mounting frame, the profiling pressure roller mechanism is located directly above the film winding mechanism, the film feeding mechanism and the film taking mechanism are respectively located on the two sides of the profiling pressure roller mechanism, the film clamping mechanism is located behind the film taking mechanism, a fiber sensor a is arranged between the film feeding mechanism and the profiling pressure roller mechanism, a fiber sensor b is arranged on the outside of the film taking mechanism, a film cutting mechanism is further arranged on the mounting frame and located below the film feeding mechanism. The application has the beneficial effects that the winding film is placed on the film feeding mechanism, the film clamping mechanism clamps the winding film, and the winding film is wound under the cooperation of the profiling pressure roller mechanism and the film winding mechanism, and the winding film is cut by the film cutting mechanism after winding, so that the manual winding of the winding film is replaced, and the work efficiency is improved.

The invention relates to the technical field of bionic touch, in particular to a flexible touch sensor with a double-channel structure and a preparation method. According to the flexible tactile fiber sensor, a double-coaxial optical fiber structure is obtained by wrapping a cladding outside a core body, a grating is arranged at the central position of the core body to form an optical channel, and the cladding is a piezoelectric fiber to form a piezoelectric sensing channel, so that the flexible tactile sensor with optical and electrical dual channels is formed. During mechanical bending, optical wave change occurs to optical channel strain formed by the core body, and the curvature can be obtained through bending and loss mapping of the optical channel; meanwhile, the strain of an electrical channel formed by the cladding generates voltage change, strain or stretching can be obtained through piezoelectric charge or voltage response of the electrical channel, a joint model is established through electro-optical joint calibration, and real strain without temperature interference and real temperature change without strain interference can be obtained respectively; the strain contribution during bending can be accurately distinguished.

Systems described herein may be provided to facilitate and improve medical guidance. Such systems may include one or more instruments or medical devices, each equipped with one or more optical transducers. Medical guidance systems may further include ultrasound probes. The optical transducers may be configured to respond to ultrasound signals emitted by the ultrasound probes. The medical guidance systems are configured to determine location information according to the response of the optical transducers.