15 results about "Fiber bragg grating sensor" patented technology

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 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.

This utility model discloses a performance testing device for fiber Bragg grating (FBG) sensor design, relating to the field of FBG sensor testing technology. It includes a test bench, with a test controller fixedly mounted on one top side. A test chamber is fixedly connected to the bottom back side of the test controller. A test connection plate is fixedly mounted on the inner wall of the test chamber near the test controller, and a test connection hole is formed inside one side of the test connection plate. Multiple limiting platforms are set at various positions within the test chamber to place the FBG sensors to be tested. The sensors are placed within the limiting platform to ensure stability and prevent them from touching each other. One end of each FBG sensor is inserted into the test connection hole on the test connection plate. The test controller uses a data display and control setting panel to simultaneously test multiple FBG sensors.

The present application belongs to the technical field of slope reinforcement, and discloses an anchor cable device for open-pit mine slope reinforcement and a layout method, which comprises: a composite fiber anchor cable body; an anchoring section design module connected with the end of the anchor cable body and used for designing a threaded surface structure of the anchor cable to increase the contact area with grouting material; a sensing and monitoring module comprising an optical fiber sensor and a temperature sensor embedded in the anchor cable body, and each sensor being connected with the anchoring section design module and used for monitoring the stress, displacement and temperature change of the anchor cable; the sensor module uses the optical fiber sensor to collect signals and analyzes the wavelength shift of light waves based on the light wave reflection principle to evaluate the stress state of the anchor cable. In the present application, the fiber Bragg grating sensor is pre-buried between the carbon fiber layers in the mold forming stage, the radial compressive stress generated by the resin curing shrinkage is used to realize the full circumferential fixation of the sensor, the strain monitoring accuracy is improved, and real-time and reliable anchor cable stress change monitoring data is obtained.

This invention discloses a coal mine natural fire monitoring device based on fiber Bragg grating sensors, belonging to the field of fiber Bragg grating sensors. It includes an optical cable and a unit box deployed in a coal mine roadway. The unit box includes multiple fiber Bragg grating temperature sensors connected in series on a single optical cable using wavelength division multiplexing (WDM) technology. The cable is laid along the coal mine roadway or goaf. An installation device is mounted on the coal mine roadway using an anchor bolt machine. The installation device includes a supporting anchor bolt, which penetrates the coal mine roadway and extends into the soil layer. The supporting anchor bolt has a hollow rod structure, with a sharp end at one end. Multiple grouting holes are also provided on the surface of the supporting anchor bolt, distributed along its length. This invention offers high measurement accuracy, strong environmental adaptability, convenient maintenance, high system reliability, high functional integration, and a safe, passive design with zero false alarms and zero missed alarms. It is particularly suitable for fire monitoring in coal mine roadways.

The application discloses a bolt group reliability evaluation method based on a group cooperative strain index, and belongs to the technical field of structure health monitoring. The technical points are as follows: fiber Bragg grating sensors are arranged at positions corresponding to wall plates around each monitored bolt, and the center wavelengths of the fiber sensors when each bolt is completely fastened and completely loosened are recorded; the loosening of the bolts is simulated, the fastening force of any number of bolts is changed, and the center wavelength offset of the fiber sensors after the loosening and when the bolts are completely fastened is recorded; the strain change amount of each bolt is calculated through the center wavelength offset of the fiber sensors, and the strain change amount is normalized to determine the loosening position of the bolt, analyze the strain of the loosened bolt, identify the fastening force of the bolt according to a bolt group fastening force calculation method based on an adaptive segmented base function, and construct a multi-index evaluation system of the fastening state of the wall plate based on the identification result to evaluate the fastening state of the wall plate.

The application discloses a kind of high-flux myocardial tissue μN level contractility fiber grating sensors, it is characterized in that, including several sensing units, each sensing unit includes pedestal and fiber segment, the fiber segment between different sensing units is sequentially connected in head and tail;Wherein the pedestal is hollow structure, the both ends of fiber segment are fixed to the side of pedestal, the middle part of fiber segment is fixed to the other side of pedestal, so that the part of fiber segment passing through the hollow area of pedestal forms a pair of parallel suspended intervals;Fiber grating is provided on the suspended interval of one side of fiber segment, the radius of the suspended interval of fiber grating in fiber segment is less than the radius of the rest of fiber segment, fiber grating is provided with first grid area and second grid area, and the radius of first grid area and second grid area is not identical.The sensor can realize real-time distributed monitoring of myocardial tissue, and can realize temperature self-compensation, simple structure, high precision.

The application discloses a kind of pneumatic soft body fingers with variable stiffness finger plate and force feedback and control method, including flexible joint main body, variable stiffness finger plate and fiber bragg grating sensor.Flexible joint main body is made of silicone rubber, inside is provided with wave cavity, is connected external air pressure source by pneumatic interface.Variable stiffness finger plate is arranged at one side of gripping surface, inside is filled with flowable solid particles, is connected external vacuum source by vacuum interface, realizes the fast adjustment of finger plate stiffness in 8 to 15 times by vacuumizing.Light fiber bragg grating sensor is embedded in the back of finger, and bending strain and fingertip contact force are detected in real time.Control method is: the measured value of acquisition fiber wavelength signal and the measured value of bending angle are calculated, the working mode of variable stiffness finger plate is decided according to the comparison result of target gripping force and preset threshold, and the opening of pneumatic proportional valve is adjusted by PID algorithm closed loop, so that gripping force is stabilized in target error range.

This application relates to the field of fiber optic sensing measurement and engineering structure stress analysis technology, and particularly to a method for measuring the thermal stress of a boiler structure based on fiber Bragg grating technology. The method includes: S1 sensor deployment; S2 spectral signal transmission; S3 spectral line preprocessing; S4 center wavelength demodulation; S5 thermal stress inversion; S6 stress map reconstruction; and S7 anomaly identification. This application achieves synchronous sensing and precise decoupling of temperature and strain in high-temperature and complex environments by deploying decoupled fiber Bragg grating sensors in key stress areas of the boiler structure and introducing a Bragg reflection center wavelength response model. This response mechanism, based on the nonlinear coupling relationship between wavelength drift and temperature or strain, effectively avoids the problems of traditional thermocouples and resistance strain gauges being susceptible to temperature drift interference and having limited deployment numbers, significantly improving the accuracy and distribution integrity of thermal stress identification.

The utility model provides a kind of dynamic response pipe shed device of controlling stratum subsidence, comprising: pipe shed steel pipe, pipe shed steel pipe surface distribution grouting hole, tail part installs grouting valve, each section pipe shed steel pipe head welding grouting independent closed groove, grouting independent closed groove is equipped with joint;Pipe shed steel pipe inner wall closely fiber bragg grating sensor, extend pipe shed steel pipe tail and fiber bragg grating monitor are connected, hollow part erects partition grouting pipe bundle, by clamp fixed position;Partition grouting pipe bundle is connected in pipe shed steel pipe tail with partition grouting valve, close grouting independent closed groove joint area installs tee, by grouting hose and joint are connected;After grouting is completed, fiber bragg grating sensor will pipe shed strain data be transmitted to fiber bragg grating monitor and be analyzed, according to the analysis result, specific area is carried out accurate, quantitative, low pressure compensation grouting.The utility model's device carries out accurate grouting compensation strategy to high-risk area, avoids grouting deficiency, and timely carries out dynamic response to stratum subsidence.

This invention discloses a method for detecting link deformation based on fiber Bragg grating sensors, including steps such as establishing a finite element model of the link, finite element analysis, designing the arrangement scheme of the fiber Bragg grating sensors, calibration of two types of fiber Bragg grating sensors, experimental preparation for the link under test, loading experiment of the link under test, calculation of deformation parameters, reconstruction of each structural unit of the link, reconstruction of the overall structure of the link, and comparison of deformation detection results. Beneficial effects: This invention can utilize fiber Bragg grating sensors to perform overall deformation detection on links involving both thin-walled annular structures and long rod structures; it can output detection results more intuitively and accurately, providing a new and feasible method for accurate detection of link performance and deformation detection of other critical components in marine power equipment.

A fuel gauging sensing device for a fuel tank for aircrafts includes an optical fiber harness along the internal surface of the tank, a master optical controller connected to a first terminal of the optical fiber harness, a slave optical controller connected to a second terminal of the optical fiber harness, wherein the optical fiber harness includes Fiber Bragg Grating (FBG) sensors spaced in the optical fiber harness between 1 mm and 25 mm to provide temperature gradients inside the tank and wherein the master and slave optical controllers are configured to obtain the fuel gauging of the tank based on the output from the FBG sensors.

This invention relates to the field of radio frequency microwaves and discloses a high-power three-stage 3dB coupler combiner, comprising a liquid-cooled plate with internal liquid channels and having a first surface and a second surface opposite to the first surface; a first-stage combining module containing four first-stage 3dB couplers arranged on the first surface of the liquid-cooled plate; a second-stage combining module containing two second-stage 3dB couplers arranged on the second surface of the liquid-cooled plate; and a third-stage combining module containing one third-stage 3dB coupler configured as an independent structural module. The system utilizes a fiber Bragg grating sensor to monitor the temperature rise data of the isolated load in real time. A calorimetric inverse feedback control unit executes a thermal-RF inverse mapping algorithm to convert the differential-mode heat at the isolated end into a phase deviation signal, thereby controlling the output phase of the RF source. This invention achieves miniaturization, efficient heat dissipation, and closed-loop phase adaptive calibration of the high-power combining device.

This utility model discloses a product monitoring device and an infrared system, relating to the field of product condition monitoring technology. The product monitoring device includes a fiber Bragg grating sensor, which includes an optical fiber and at least one monitoring part arranged along the optical path of the optical fiber. The monitoring part is used to be attached to or embedded in the product to monitor at least one of the product's stress and temperature. The aforementioned product monitoring device, through the arrangement of the monitoring part attached to or embedded in the product, can meet the measurement requirements for the product's stress and temperature parameters. The measurement needs can be met using a single fiber Bragg grating sensor, saving space.

This invention relates to the field of smart grid substation equipment technology, and discloses a dry-type transformer device for smart grids, including a transformer core, windings, and an epoxy resin insulation layer. It also includes a microfluidic capillary network embedded within the insulation layer, with a Tesla valve structure on its inner wall and filled with fluorinated liquid, forming a closed-loop channel connected to an external heat sink. The capillary network is rigidly connected to the core, utilizing the core's inherent vibration to achieve passive unidirectional pumping cooling of the fluorinated liquid. A fiber Bragg grating sensor array is installed within the network, connected to an external fiber optic demodulator and an edge computing gateway. The gateway operates a multi-dimensional diagnostic system, reconstructing the internal three-dimensional temperature field by analyzing the grating wavelength shift signal and extracting weak acoustic vibration signals, thereby achieving partial discharge spatial location, insulation aging assessment, and dynamic generation of safety overload margin. This invention solves the internal heat dissipation bottleneck of the transformer, realizing non-destructive targeted cooling of core components and deep, multi-dimensional, precise monitoring of their condition.