422 results about "Optical fibre sensor" patented technology

The invention provides a tunnel health monitoring method based on distributed optical fiber sensing, and relates to the technical field of tunnel engineering health monitoring, and the method comprises the steps: carrying out the risk assessment of a tunnel through employing an analytic hierarchy process, setting a differential optical fiber laying scheme according to an assessment result, and laying distributed optical fiber sensors on the inner surface of a tunnel lining; the method comprises the following steps: acquiring original strain data through Brillouin optical time domain analysis, and preprocessing by using a moving average filtering algorithm; building a finite element model based on actual physical data of the tunnel, inverting strain data into full-field node displacement, and obtaining a complete strain tensor of a finite element unit; performing unit-level strain state evaluation, time sequence trend risk evaluation and spatial clustering risk evaluation to obtain a comprehensive risk value; and setting a dynamic evaluation threshold interval, and completing tunnel accurate region health evaluation. Accurate monitoring and risk assessment of the tunnel health state are achieved, and the method can be widely applied to the field of safety monitoring of highway and railway tunnels.

The invention provides a method for constructing an arch-shaped large-span shell steel roof, and belongs to the technical field of arch-shaped large-span shell steel roof construction. A temporary supporting system is built, and distributed optical fiber sensors are arranged to monitor the lifting process of a main arch; a cable force distribution scheme of a cable supporting system is calculated by adopting a double-layer game optimization model to realize cooperative control of stress uniformity and form precision, tensioning force is applied by using an intelligent tensioning system in stages, and a crane moving path is planned in combination with a path optimization algorithm based on a graph theory to realize graded unloading of a temporary supporting system. The technical problem that it is difficult to achieve structural stress uniform distribution and form accurate control of an arched large-span shell steel roof at the same time in the tensioning process of a cable supporting system is solved.

The invention discloses a seepage monitoring method and system based on an optical fiber sensor, and relates to the technical field of slope seepage monitoring, and the method comprises the steps: distributing distributed optical fiber sensors along an inclinometer pipe in a slope; laying an optical fiber heating system; a distributed temperature sensor DTS is used for collecting scattered light signals of the distributed optical fiber sensor; the scattered light signals collected by the DTS are demodulated; acquiring strain data in the slope; performing temperature compensation on the obtained displacement data; according to the obtained distributed temperature data and the displacement data after temperature compensation, the position and range of seepage in the slope are determined; calculating the seepage rate and the seepage flow of the corresponding position through the seepage model and the heat conduction equation; and judging the seepage degree of the side slope. According to the invention, aiming at the low precision of slope seepage monitoring in the prior art, the distributed temperature sensor DTS is utilized to collect the temperature distribution data of the optical fiber along the way, and temperature compensation and the RBF neural network model are combined, so that the precision of judging the slope seepage is improved.

The invention provides an FPI optical fiber temperature sensor based on a PDMS filled capillary glass tube, which comprises a capillary glass tube, one end of the capillary glass tube is filled with cured polydimethylsiloxane, the other end of the capillary glass tube is inserted with a single-mode optical fiber, in the capillary glass tube, the end surface of the polydimethylsiloxane is a concave surface, and the end surface of the single-mode optical fiber is a convex surface. The end face of the single-mode optical fiber is a plane, the end face of the polydimethylsiloxane and the end face of the single-mode optical fiber form two reflecting faces of the Fabry-Perot cavity, light input is carried out in the single-mode optical fiber, and light output is carried out in the Fabry-Perot cavity. Displacement of the end face of the polydimethylsiloxane as a function of a temperature change causes an interference wavelength in the Fabry-Perot cavity to be adjusted to map the temperature change. The invention provides the PDMS-filled SCT-based micro-air cavity FPI optical fiber sensor which is simple in structure, easy to manufacture, low in cost, small in size and ultrahigh in precision, and is used for high-precision temperature detection.

The application discloses a kind of EFPI optical fiber sensor multi-sensor multiplexing temperature-pressure demodulation system and method, including ASE broadband laser, optical circulator, EFPI optical fiber sensor, 2-way wavelength division multiplexer, N-way wavelength division multiplexer, N-way wavelength division demultiplexer, photoelectric detector, FBG, 1*2 optical fiber coupler, optical spectrometer, data processing system;The input port input of the optical circulator is connected with ASE broadband laser, the output port cir2 is connected with two cascaded FBGs, the output port cir3 is connected with EFPI optical fiber sensor, the input port of 2-way wavelength division multiplexer is connected with the output port cir4 of optical circulator, and the output port is connected with N-way wavelength division multiplexer;N-way wavelength division multiplexer is accessed via the input port of 1*2 optical fiber coupler, and outputs two-way signals, one-way is connected with N-way wavelength division demultiplexer via N-way photoelectric detector and data processing system, and the other way is connected with optical spectrometer;N channels are connected by cascaded FBG, and the cascade of N EFPI optical fiber sensors is realized.

The invention relates to the technical field of wind power blades, in particular to a distributed optical fiber monitoring system for monitoring cracks of a wind power blade. Comprising a distributed optical fiber sensor, a demodulator, a wireless network bridge, a junction box and a jumper wire, when the surface of a wind power blade main body is subjected to abnormal stress, the distributed optical fiber sensor is synchronously subjected to the abnormal stress, so that strain information of the blade surface is monitored, and the strain information is transmitted to the demodulator through an optical fiber signal; finally, the demodulator transmits data to a remote monitoring platform and gives an alarm in time, a remote operator can stop operation of the fan in time, dangerous accidents are avoided, the distributed optical fiber sensors do not belong to electrical equipment, optical signal transmission is adopted, the danger of lightning triggering is eradicated, and the safety of the fan is improved. Alarm and early warning can be carried out in advance when 1 mm tiny cracks appear on the blade body, the aim of early finding and early treatment is achieved, losses are reduced to the minimum, and small faults are prevented from becoming major safety accidents.

The invention relates to the technical field of optical fiber sensing, and provides a micro-fluidic temperature and salt control two-parameter optical fiber sensor based on an anti-resonance effect and a preparation method and a test system thereof, the optical fiber sensor comprises a leading-in single-mode optical fiber, a hollow-core tubular optical fiber, a side single-hole double-core optical fiber and a leading-out single-mode optical fiber which are cascaded in sequence; a micro-groove is etched at the cladding of the fusion welding end of the introduction single-mode fiber and the hollow-core tubular fiber; the side wall of the hollow-core tubular optical fiber is etched with a micro-channel which vertically penetrates through the cladding of the hollow-core tubular optical fiber. The side single-hole double-core optical fiber is located between the hollow-core tubular optical fiber and the leading-out single-mode optical fiber, and an air hole parallel to the axial direction is formed in the side single-hole double-core optical fiber to form a fluid outflow channel; through the scheme, the response speed and the detection sensitivity are improved.

The invention discloses a gradient preparation method of a compact barrier type rare earth ceramic coating, and belongs to the technical field of high-temperature protective coatings. The preparation method comprises the following steps: pretreating a tungsten electrode substrate; sequentially preparing a sensor layer integrated with a distributed optical fiber sensor, a gradient transition layer which is realized by adopting a four-channel synchronous powder feeding technology and has continuous and gradual components, and a self-adaptive layer which is prepared by adopting a laser-induced in-situ synthesis technology and contains high-entropy rare earth zirconate and an intelligent additive; the self-healing layer contains a triple temperature triggering microcapsule system; and finally, post-processing and function activation are carried out. The prepared coating forms an intelligent response type gradient composite structure from inside to outside, has excellent interface bonding strength, thermal shock resistance and high-temperature chemical stability and has damage self-healing and service state real-time monitoring functions, and the service life of the tungsten cathode under the severe working condition is remarkably prolonged.

The invention discloses an all-silica optical fiber Fabry-Perot sensor and a manufacturing method. The sensor is composed of a silica optical fiber, a quartz tube, a reflector, an optical fiber tail cable and an optical fiber connector. Wherein the core structure quartz optical fiber, the quartz tube and the reflector are all made of quartz materials, and the quartz optical fiber and the quartz tube are connected through laser welding to form a full-quartz structure, so that maximum thermal expansion coefficient matching is realized, the packaging internal stress of the sensor is reduced, and the working temperature upper limit and the measurement precision are improved. According to the optical fiber sensor, Fabry-Perot interference is formed through reflected light of the end face of the optical fiber and the end face of the reflector, the optical fiber temperature, strain and pressure sensor of a full-quartz structure can be formed by replacing the reflector and changing the connection relation between the reflector and the quartz tube, and the universality is high.

The invention discloses an autoclave forming method which comprises the following steps: dividing a component into a stress sensitive area and a conventional area through finite element simulation analysis on the basis of geometrical characteristics of a three-dimensional model of the component to be formed, establishing a thermal-mechanical coupling finite element analysis model of each area, and presetting a differential temperature-pressure-time process curve; secondly, a distributed optical fiber sensor is arranged in the composite material prefabricated body, a micro pressure sensor array is arranged at the key position of the surface of the mold, and the distributed optical fiber sensor and the micro pressure sensor are both connected with a central control system; then, performing differential pressure and temperature control on each area by adopting closed-loop control in sequence; and finally, the central control system collects sensor data in real time, judges whether the forming process is abnormal or not through a defect recognition algorithm, automatically starts a grading early warning mechanism when detecting that the forming process is abnormal, and executes a self-adaptive adjustment strategy, including inter-region cooperative pressure compensation, so as to eliminate forming defects.

According to the indigenous plant adaptability screening test method simulating the environmental stress condition, the transparent incubator is combined with real-time monitoring equipment such as the high-resolution miniature camera array and the optical fiber sensor, complex laboratory equipment is replaced, and the root system observation problem is solved. The environmental stress condition of a target habitat is accurately simulated, the environmental characteristics of drought, depletion, special soil structure and the like of the high and steep slope are accurately restored by adopting layered matrix and dynamic stress intervention, a systematic evaluation system is established by combining multi-index quantification and a similar analytic hierarchy process, the subjectivity of artificial experience judgment is avoided, and the evaluation accuracy of the high and steep slope is improved. And the scientificity and engineering applicability of indigenous plant screening are remarkably improved.

A cable state evaluation method and apparatus, and a terminal device and a storage medium. The method comprises: acquiring sensing data by means of an optical fiber sensor; dividing sampling points, and dividing sampling points on the same optical fiber segment into one group; integrating sensing data of each group of sampling points and inputting same into an optical fiber segment state evaluation model, so as to obtain a state evaluation result of a corresponding optical fiber segment; and on the basis of state evaluation results of all optical fiber segments, obtaining a cable state evaluation result of an entire optical fiber. Data collection, processing and evaluation can be automatically performed, thereby reducing manual intervention and improving the work efficiency and the accuracy of cable state evaluation results.

The invention provides a slope displacement monitoring device and method based on distributed optical fiber pile multi-dimensional perception. The device comprises an optical fiber pile formed by connecting a plurality of perception units in series, a demodulator, a direction calculation device, a displacement calculation device and an early warning device. The sensing unit comprises an elastic framework and a plurality of optical fiber sensors which are annularly arranged, and three-dimensional strain sensing is achieved through cooperative deformation with the rock mass. The method comprises the steps of sensing unit manufacturing, optical fiber pile field assembly, data acquisition and demodulation, direction and displacement calculation and early warning judgment. Data complementation and fault tolerance are realized through a sensor layout of axial series connection and annular parallel connection; in combination with an arc strain extension algorithm and a deformation accumulation model, synchronously interpreting the three-dimensional displacement in the slope and the main control deformation direction; and a grading early warning model is constructed based on the strain change rate and the displacement, so that intelligent early warning from microscopic damage to macroscopic instability is realized. According to the invention, the monitoring dimension, precision and reliability are improved, and the method is suitable for slope rock mass engineering safety monitoring and early warning.

The invention discloses an MXene-based dual-channel cascade coreless optical fiber SPR sensor and application thereof, the sensor is formed by cascading a multimode optical fiber with two sections of coreless optical fibers, the NCF area of the channel 1 is only coated with a gold film, and the NCF area of the channel 2 is coated with a gold-cysteamine-MXene composite film. Theoretical analysis shows that when the NCF lengths of the channel 1 and the channel 2 are 5 mm and 12 mm respectively, the visibility of formants is optimal, and the distance between the formants can be increased by increasing the thickness of MXene. Experiments show that in the refractive index range of 1.333-1.366, the optimal number of layers of MXene is four, at the moment, the RI sensitivity of a channel 1 and the RI sensitivity of a channel 2 reach 1894.27 nm / RIU and 4001.48 nm / RIU respectively, and the FOM is 16.86 RIU <-1 > and 32.99 RIU <-1 > respectively. The device is simple in structure, low in cost and convenient to operate, and has good application potential in the field of two-parameter biochemical sensing.

The application discloses a hydrogen-doped natural gas transportation safety risk assessment method and system, relates to the technical field of hydrogen-doped natural gas pipeline safety monitoring, and comprises the following steps: initializing a safety situation assessment engine and injecting gas components; collecting pipeline strain vibration through a distributed optical fiber sensor, identifying low-frequency noise characteristics caused by hydrogen-induced material changes; superimposing and reconstructing in combination with historical corrosion crack maps to generate a mixed risk map and divide risk sections; calculating the combustible migration rate of mixed gas and the cumulative fatigue reduction coefficient of the pipeline wall material in each risk section; and quantifying risk entropy values by comprehensively considering both, thereby generating a differentiated maintenance strategy. The method can realize early identification of hydrogen damage to pipeline materials in a hydrogen-doped environment, and realizes accurate positioning and assessment of risks by fusing historical defect information, thereby providing technical support for active safety maintenance of the pipeline.

An optical fiber sensor device, comprising an optical fiber sensor probe, a position adjusting mounting base; the optical fiber sensor probe comprises a mounting hole A group, a mounting screw A group; the position adjusting mounting base comprises a mounting screw hole B group, a mounting hole C group, a mounting screw C group; the mounting screw A group is connected with the mounting hole screw hole B group through the mounting hole A group; the mounting screw C group is connected with the detection mounting part through the mounting hole C group; the position adjusting mounting base is used for adjusting the relative position of the optical fiber sensor probe and the detection mounting part. A wider range of sensor probe detection distance is provided, flexibility is increased, and production efficiency is improved.

The invention discloses a rail transit protection area inspection method and system based on an optical fiber sensor and an unmanned aerial vehicle, and the method comprises the steps: obtaining optical fiber data corresponding to a rail transit protection area through the optical fiber sensor, acquiring multi-source sensing data corresponding to the rail transit protection area through a plurality of sensors carried on an unmanned aerial vehicle; and based on the optical fiber data and the multi-source sensing data, detecting a target in the rail transit protection area by using a deep learning model to obtain a detection result. According to the invention, high-precision, all-weather and full-scene intelligent inspection of the rail transit protection area can be realized, the accuracy and the real-time performance of intrusion detection are remarkably improved, and the manpower inspection cost is reduced.

A multi-parameter sensing and bearing integrated structural plate for space is characterized by comprising a front panel, an inner plate, an outer frame, a distributed optical fiber sensor, a vibration sensor, a multi-core photoelectric connector and a pressure sensor. The inner plate is embedded in the outer frame, and the four corners of the inner plate are each provided with a pressure sensor. A plurality of honeycomb grooves are formed in the upper end surface of the inner plate; vibration sensors are fixed in part of the honeycomb grooves; a multi-core photoelectric connector is fixed at one angular position of the inner plate; each vibration sensor is connected with the multi-core photoelectric connector; the front panel covers the inner plate, and a distributed optical fiber sensor is fixed on the lower end face of the front panel. According to the structural plate, various sensors are mounted in the structural plate in a nesting and stacking manner, so that the structural plate can measure various parameters; and meanwhile, the structural plate directly transmits the pressure to the mounting main body through the outer frame, so that a stroke gap is eliminated, and the pressure sensor does not need to generate relative displacement and directly measures the external absolute pressure amount.

The invention discloses a cascade seven-core optical fiber sensor applied to folic acid detection and a preparation method of the cascade seven-core optical fiber sensor, and belongs to the technical field of optical fiber sensing and biological analysis detection. The sensor comprises a first single-mode optical fiber, a seven-core optical fiber section and a second single-mode optical fiber, a double-microsphere-cavity structure is arranged at the optical fiber connecting position to form a cascade interference optical path, and tapering is conducted on the middle portion of the seven-core optical fiber section to form a sensing area. According to the invention, mode matching is improved through the microsphere cavity, an evanescent field is enhanced through tapering, and high-sensitivity specific detection of folic acid is realized in cooperation with the folic acid binding protein biological functional layer fixed on the surface; the sensor obtains stable linear response to a folic acid standard solution in the range of 0-50 ng / mL, a clinical serum sample verifies that the detection result of the sensor is highly consistent with that of a chemiluminescence method, the sensor has good reusability, and the sensor has the advantages of being easy to prepare in structure, rapid in response, high in sensitivity, capable of being matched with a complex matrix and the like, and has good application prospects. The method has huge potential in clinical folic acid quantitative detection.

The present application belongs to the technical field of structure monitoring based on optical fiber sensing technology, and particularly relates to a strain compensation correction method for optical fiber sensors based on a numerical model. Based on a finite element analysis model for strain transmission of a concrete-optical fiber sensor structure, a theoretical strain transmission rate of a theoretical model of the concrete-optical fiber is determined. The elastic modulus and Poisson's ratio of different materials of a packaging layer of the optical fiber sensor are determined through a material tensile test, a global finite element model of the concrete-optical fiber sensor is established, and the theoretical strain transmission rate of the concrete-optical fiber sensor is calculated. Through a strain monitoring test of the concrete optical fiber sensor, the ratio of the strain monitored by the optical fiber in the concrete to the strain monitored by a strain gauge on the surface of the concrete is determined, the test monitoring value of the strain transmission rate of the concrete-optical fiber sensor is obtained, the error of the theoretical model is corrected through the test value, and the error correction coefficient is determined. The present application is suitable for high-precision compensation correction of strain monitoring data of optical fiber sensors affected by multiple layers of media.

Mixed sensor array devices are provided herein. Mixed sensor arrays as described herein include acoustic energy generating elements and optical fiber based acoustic sensors. Optical fiber based sensors may optical structures responsive to physical parameters including acoustic signals, pressure, and temperature, and are configured to detect and receive acoustic signals and other physical parameters and provide associated optical signals to a system for processing and interpretation to implement tracking, location, imaging, and other sensing capabilities. Optical fiber based sensors provided herein may be disposed at ends of or along the length of optic fibers. Optical fiber based sensors may be included within various devices, including, for example, medical devices.

The invention belongs to the technical field of optical fiber sensing, and discloses a seawater temperature, salinity and depth integrated optical fiber sensor based on a composite microstructure and a preparation method. The single-mode optical fiber, the first coreless optical fiber and the graded-index optical fiber are sequentially welded to form a collimation structure for long-distance transmission of light beams; one end of the graded-index optical fiber is sequentially connected with the hollow-core optical fiber and the second coreless optical fiber; the hollow-core optical fiber core is filled with polydimethylsiloxane, and the filling position of the polydimethylsiloxane is located at the end where the graded-index optical fiber and the hollow-core optical fiber core intersect; the microsphere structure is sequentially divided into a cladding cavity and an air cavity from outside to inside; the end face of one end of the second coreless optical fiber intersects to the air cavity and the cladding cavity of the microsphere structure. Test results show that the seawater temperature, salinity and depth integrated optical fiber sensor based on the composite microstructure has the potential of integrated measurement of seawater temperature, salinity and depth parameters.

The utility model relates to the technical field of road monitoring, in particular to an expressway collapse real-time monitoring and early warning system based on distributed optical fibers, which comprises the distributed optical fibers laid on two sides of an area to be monitored of an expressway along the length direction; an optical fiber sensing monitor; and the optical fiber sensing monitor is connected to the distributed optical fiber and is used for transmitting an optical carrier signal to the distributed optical fiber. According to the utility model, on the basis of the distributed optical fiber sensors, monitoring and early warning are carried out on easy-to-collapse road sections of the expressway, once the road collapse is monitored, the collapse position can be positioned in real time, and the acousto-optic indication component in the corresponding area generates an alarm signal to warn drivers in the current road area, so that the driving safety of the expressway is improved. A certain time and space are reserved for effective danger avoiding of vehicles coming behind, and the probability of traffic accidents occurring in the neutral period before the site is blocked after collapse can be reduced.

The invention relates to an automatic blind installation device for a multistage cycloid pump rotor. A rotor clamping assembly comprises a supporting frame capable of ascending and descending, and clamping fingers are arranged in the supporting frame; a detection sleeve is arranged at the lower end of the supporting frame, the lower ends of the clamping fingers are inserted into the detection sleeve, an optical fiber sensor is arranged on the inner wall of the detection sleeve, and a rotor limiting seat is arranged at the lower end and provided with a limiting seat through hole aligned with the optical fiber sensor; the shell is arranged on the shell positioning assembly, the detection sleeve and the rotor limiting seat are firstly driven by the supporting frame to enter the shell, then the shell is driven by the shell positioning assembly to rotate, a blind hole in the bottom of the shell is detected through the optical fiber sensor to determine a to-be-assembled position, and after the shell rotates to the to-be-assembled position, the detection sleeve and the rotor limiting seat are fixed. The detection sleeve and the rotor limiting base are driven by the supporting frame to be separated from the shell, then the upper end of a rotor shaft in the middle of the rotor penetrates through the rotor limiting base and then is clamped through the clamping fingers, and a rotor pin shaft on the edge of the rotor is aligned with a limiting base through hole. During assembly, the rotor can be directly inserted into the shell to realize blind assembly.

The application discloses a kind of metal pipe residual stress elimination method, system and device, method includes: S1 obtains residual stress data and judges high stress area;S2 is sequentially carried out local stress elimination processing to each high stress area, calculates local stress release rate until switching area after reaching standard;S3 carries out overall collaborative stress processing, applies stepwise hydraulic overload and synchronously applies adaptive rotary vibration;S4 real-time monitoring overall processing index, judge whether to meet three termination conditions;S5 pressure relief and low-temperature heat treatment are carried out.The system includes stress mapping module, local processing module, overall processing module, monitoring control module and post-processing module.The device includes clamping and rotating mechanism, hydraulic loading mechanism, exciter, excitation ring, distributed optical fiber sensor and controller.The application can identify high stress area one by one, and adaptively make processing parameters always match the real-time state of pipe, ensure that stress is uniformly released, and effectively eliminate pipe residual stress.

This improves the degradation of the cross-correlation coefficient caused by the error between the set frequency and the actual frequency of the light source, and makes it possible to improve the degradation of the measurement accuracy of strain and temperature. [Solution] The light source unit has a frequency-stabilized wavelength-tunable laser that generates continuous light, and a first optical coupler splits the continuous light generated by the light source unit into two, sending one to a second optical coupler and the other to an optical frequency measurement unit. The optical frequency measurement unit measures the frequency of the continuous light generated by the light source unit, and the second optical coupler further splits the continuous light split by the first optical coupler into two, sending one as probe light to the optical pulse generation unit and the other as local light to a detection unit. The detection unit measures the frequency change Δf by means of coherent time domain reflectometry and a means for heterodyne detection of the Rayleigh scattered light and the local light resulting from Rayleigh scattering of pulsed light in the fiber under test. max and means for acquiring the

The invention discloses a non-intrusive sewage pH measuring method based on an electrical impedance tomography technology, which comprises the following steps of: based on an electromagnetic field theory, acquiring a sewage boundary electric signal through the electrical impedance tomography technology, establishing theoretical correlation between pH and electrode potential by combining a Nernst equation, constructing a constitutive equation, and finally, inverting a pH value by measuring the boundary electric signal, so as to measure the pH value of the sewage. Therefore, a measurement mode which does not need to intrude into a pipeline and avoids pollution and interference is realized, the defects that a traditional electrode is fragile and difficult to miniaturize, and an optical fiber sensor is easily disturbed by the environment and is complex in high-precision assembly are overcome, the influence of the complex environment of a water body is avoided, and the measurement and calculation precision of the pH is improved.

The present application belongs to the field of gas-liquid two-phase flow measurement and optical fiber sensing technology, and particularly relates to a liquid metal bubble detection sensor based on optical fiber reflection. A light signal is emitted from a laser light source, transmitted to an optical fiber probe module through a spatial light beam splitter or a fiber coupler, and reflected at the end face of the optical fiber probe module; the reflected light enters a photoelectric detector again through the spatial light beam splitter or the fiber coupler, is converted into an electric signal through a photoelectric conversion circuit, transmitted to a computer through a data acquisition card, and outputted after signal processing to obtain the void fraction and bubble frequency of the detected opaque liquid metal; the optical fiber sensor is based on the obvious difference in reflectivity at the interfaces between the opaque liquid metal, the bubbles and the optical fiber material, and the speed and distribution information of the bubbles are determined by analyzing the echo signal received by the photoelectric detector. The present application can stably and accurately complete bubble detection in a high-temperature liquid metal environment.

The application provides a high-sensitivity optical fiber sensor and a distributed vibration detection system, and relates to the technical field of optical fiber sensors.The high-sensitivity optical fiber sensor comprises a sensor and a transparent plastic pipe, the right side of the sensor is fixedly connected with an optical fiber one, the outer wall of the upper part of the transparent plastic pipe is provided with a threaded wall, the threaded wall is threadedly connected with a hollow transparent pipe, and the outer wall of the upper part of the hollow transparent pipe is fixedly connected with four sliding rod groups at equal intervals.A hollow sliding ring is rotated, a pressing type infusion air bag is used to paste and fix colloid coating, the elastic potential energy of springs one and two is used to drive the hollow rod and the pressing rod to be extruded and fixed, the bending between optical fibers is avoided, the influence on the sensitivity of the sensor is avoided, different modules are matched, distributed vibration signals are detected, and then a signal amplifier and a signal analyzer are matched, so that the sensitivity of the sensor is improved, and the use requirement is better met.

The utility model discloses a pole piece unwinding deviation rectifying device which comprises an air swelling shaft mechanism, an edge deviation rectifying mechanism, a tension mechanism and a buffering mechanism. The air swelling shaft mechanism comprises an air swelling shaft assembly and an unwinding deviation rectifying assembly, and the air swelling shaft assembly is arranged on the unwinding deviation rectifying assembly. The edge deviation rectifying mechanism comprises an adjusting assembly and an optical fiber sensor assembly. Real-time rotating speed compensation and transverse deviation correction are achieved through the linkage design of the air swelling shaft mechanism and the unwinding deviation correction assembly, winding dislocation caused by the wavy edge of the pole piece can be counteracted in real time, the deviation correction amplitude is reduced, material waste is avoided, meanwhile, the tension of the pole piece is kept constant through the multi-shaft-roller layout of the tension mechanism, and the winding quality of the pole piece is improved. And the deviation rectifying precision and the unwinding stability are obviously improved. The speed difference between unwinding and subsequent procedures is automatically compensated by arranging the cache mechanism, so that the pole piece is prevented from being loosened or too tight; and the cylinder pressing design of the fourth angle block is matched, so that the conveying continuity of the pole piece is further ensured, and the belt breaking risk is reduced.