58results about How to "Applicable to practical application" patented technology

The invention provides an active reliability analyzing and evaluating method for highly-reliable mechanical products. The active reliability analyzing and evaluating method for the highly-reliable mechanical products includes: firstly, establishing ultimate state functions of mechanical products, utilizing a Monte Carlo simulation method to produce sample points conforming to parameter distribution, utilizing a Kriging meta-model to simulate the ultimate state functions, improving simulation precision and confirming an optimal sampling radius by automatically updating DOE (design of experiment), constructing important sampling density functions, producing random sample points through the important sampling density functions, updating the DOE continually, then extracting radius random sample points obeying chi-square distribution, confirming failure probability and failure coefficient of variation of the mechanical products, and limiting whether updating finishes or not by the failure coefficient of variation so as to obtain reliability of the mechanical products finally. The active reliability analyzing and evaluating method for the highly-reliable mechanical products has the advantages of high efficiency, good robustness and high simulation precision, comprehensive design and analysis of rail wear life and reliability to spatial mechanisms are achieved, and the active reliability analyzing and evaluating method for the highly-reliable mechanical products is significant to reliability design technology engineering of complex mechanisms of aerospace equipment.

The invention discloses a remediation method of heavy metal contaminated soil. The remediation method comprises the steps of applying humic acid on the surface of the heavy metal contaminated soil, turning and evenly mixing the soil with a thickness of 20-30 cm from the contaminated soil surface layer with the humic acid, reacting for 7-15 days and then pre-burying leaching device under a contaminated area of the heavy metal contaminated soil; leaching the soil by using a citric acid solution and a tea saponin solution in sequence through the leaching device, and recycling leaching liquid of the leaching device and leaching liquid containing heavy metals to process intensively after finishing leaching; then applying fruit residues on the soil surface, turning and evenly mixing the fruit residues with the soil with a thickness of 20-30 cm from the soil surface layer, intercropping sunflowers and brassica juncea, harvesting all the biomasses on the ground after the plants are ripe to process intensively. Due to the adoption of the method, high removal rates of various heavy metal ions in the soil are achieved; the soil is remediated completely; meanwhile, the method is low in cost, good in effect and easy to implement.

The invention provides a tobacco leaf conditioning water addition prediction method, a storage medium and terminal equipment. The method comprises the steps of acquiring the production time of tobaccoleaves, the training demand, the moisture content after feeding, the moisture content before pipe tobacco drying, the wall temperature of a pipe tobacco drying oven, the workshop temperature and theworkshop humidity parameter, and carrying out standardization and normalization on the acquired data; constructing a BP neural network by taking the parameters as input signals and a conditioning procedure water addition and outlet moisture as outputs, and determining the iterations, learning rate and target value of the neural network, so as to obtain a tobacco leaf conditioning water addition prediction model; and training the tobacco leaf conditioning water addition prediction model by taking part of processed data as training data while a preset requirement is met, and predicting the collected data by virtue of the trained tobacco leaf conditioning water addition prediction model, so as to obtain a prediction result.

The invention discloses a fringe projection three-dimensional shape measuring method and device based on parallel four-color channels. The device comprises a computer, a visible light projector, an infrared projector, a 2CCD (charge coupled device) camera and a half-transparent and half-reflecting mirror, the computer is connected with the visible light projector, the infrared projector and the 2CCD camera, the visible light projector and the infrared projector are positioned on the same horizontal plane, the distance between the visible light projector and the half-transparent and half-reflecting mirror is as same as that between the infrared projector and the half-transparent and half-reflecting mirror, the half-transparent and half-reflecting mirror is perpendicular to the horizontal plane, and 45-degree included angles are formed between the half-transparent and half-reflecting mirror and an optical axis of the visible light projector and between the half-transparent and half-reflecting mirror and an optical axis of the infrared projector. According to the method, three fringe images of a red channel, a green channel and a blue channel are combined into a composite color image,the composite color image and an infrared image are projected, the 2CCD camera simultaneously acquires the composite color image and the infrared image, number of projected fringe images is decreased, a three-dimensional shape of an object can be acquired in a one-time measurement manner, and measurement is accelerated.

The present invention proposes and discloses a method for dynamically simulating a land future use scenario. The method integrates a capability that a cellular automaton (CA) simulates a complex systematic space-time evolution process and an advantage that a CLUE-S model simulates multiple types of land use type competitions; and the method overcomes certain inherent defects of a traditional CA or a pure CLUE-S model through advantage integration; in addition, intelligent computation of a distributional probability is realized by adopting an artificial neural network (ANN) algorithm; synchronous simulation of multiple land use changes is realized by introducing a competition mechanism of a roulette, so that the new method is more suitable for multiple types of land use data; and moreover, compared with a traditional model, the method has the practical advantages of higher precision, suitability for multiple scales, low data demand, few parameters, simple and convenient operation, high speed and the like. According to the method for dynamically simulating the land future use scenario, the intelligent algorithm (ANN) and the uncertainty model (the roulette) are effectively combined; and the method is applied to the prediction of the land future use scenario.

The invention provides a multi-wavelength narrow-linewidth all-solid-state laser used for ocean exploration, and belongs to the technical field of lasers. The output energy of the 1064nm pulse laser is fully utilized, and simultaneous output of infrared light, green light, ultraviolet light and blue light can be realized through the nonlinear crystal frequency conversion technology. The multi-wavelength narrow-linewidth all-solid-state laser has the characteristics of being multi-wavelength, narrow in linewidth, compact in structure, high in efficiency and high in energy and is particularly suitable for the field of ocean wind field measurement, ocean plotting, underwater target detection and underwater communication; and the output wavelength of the blue light is within the Fraunholer line (486.1nm) of the solar spectrum so that the performance of the application system can be effectively enhanced.

The invention provides an annular optical fiber with an asymmetrical optical grating and application in orbital angular momentum generation thereof. A hollow core annular optical fiber can increase the effective refractive index between degeneracy-similar modes, thereby preventing crosstalk between the modes. A long period optical grating inscribed on the upper half ring of the hollow core annular optical fiber breaks a circular symmetry structure of the optical fiber and achieves conversion between angular non-same order modes. When input light is of a circular polarization fundamental mode, a first-order orbital angular momentum mode can be generated. The hollow core of the hollow core annular optical fiber is filled with an optical functional material with the refractive index adjustable and the wave length for generating the orbital angular momentum mode can be tuned by the refractive index of the liquid, so that the structure can generate the orbital angular momentum mode in an adjustable cross band wave length range. Simulation shows that when the optical grating period is 292 [mu]m and the optical grating length is 1.460cm, the range of broad band wave lengths with the angular momentum mode conversion rate higher than 90% can reach 237nm, the greatest conversion rate is 98.91%, and the modulation rate of the refractive index of the filling liquid for the wave lengths for orbital angular momentum mode generation is 400nm / RIU.

The invention relates to a method and device for sensing and demodulating Bragg fiber grating. The method in the invention uses the principle that chatter fiber grating has different reflective wavelengths at different positions to convert the change of sensed fiber grating wavelength into the change of system optical path difference, and then the optical path difference is measured by low coherent demodulating method, thereby being capable of accurately obtaining wavelength change of sensed fiber grating so as to obtain sensing amount. The device realizing the method comprises a broadband light source at the optical communication band of center wavelength, a fiber optic isolator, a four-port 3-dB optical fiber coupler, a polarization controller, a tunable fiber delay line, a three-port 3-dB optical fiber coupler, a sensing fiber grating, a linear chatter fiber grating, a photodetector and an oscillograph. The invention has higher measurement precision of wavelength resolution, has the advantages of strong anti-interference, simple structure, low cost, and the like, and can obtain different resolutions and parameter ranges, thereby being much applied to practical application.

The invention provides a photonic crystal groove waveguide structure capable of generating slow light of a broadband. According to the photonic crystal groove waveguide structure, a photonic crystal structure is a triangular lattice structure with the lattice constant being a and the air hole radius being r; and a middle row of air holes are removed to form photonic crystal waveguide with a W1 structure, and air grooves with width w of 0.3a is placed at a defect centre, thereby forming a photonic crystal waveguide groove. According to the photonic crystal groove waveguide structure, the lattice constant in the waveguide direction is increased to 1.06a, thus forming photonic crystal groove waveguide with an italic structure; and a first row of air holes close to the air grooves are moved by 0.05a in the direction far from the air grooves, and a second row of air holes close to the air grooves are moved by 0.13a in the direction far from the air grooves. As a simulating result shown, the broadband with the slow light reaches 2.85nm under group velocity c / 100 by virtue of the photonic crystal groove waveguide structure provided by the invention.

The invention discloses a target tracking method for an aerial image. The target tracking method comprises the steps: S100, executing an incremental search strategy around a target position of a previous frame; S200, enabling the sampled sample to pass through a twin network and a region recommendation network to obtain a target of a prediction position; S300, judging whether prediction succeeds or not by calculating the similarity between the target at the prediction position and the target template; if the prediction succeeds, storing the specific target position for the next prediction; when prediction fails, if n frames of prediction of the system in continuous N frames fail, judging that the target is lost, and entering the step S400, otherwise, judging that the target is detected mistakenly; and S400, initializing the detection frame, placing the detection frame at the central point of the current frame image, executing an incremental search strategy, and performing detection andtracking again until the target is repositioned. According to the target tracking method, the re-detection speed after the target is shielded is obviously improved, and the error sampling calculationof the detection frame is reduced, and rapid re-positioning can be realized.

The invention provides a fiber grating with a pre-distortion structure and manufacturing equipment and technology of the fiber grating. The fiber grating comprises a plurality of grating periods; and a long-period fiber grating with a positive helical deformation pre-distortion structure, a long-period fiber grating with a negative helical deformation pre-distortion structure or a long-period fiber grating with a positive and negative helical alternating deformation pre-distortion structure is formed. The equipment for manufacturing the fiber grating comprises a heating device, a three-dimensional mobile platform device and a rotating device, wherein the heating device is used for heating a processing area of a to-be-processed optical fiber into a molten state; the three-dimensional mobile platform device is used for horizontally moving the to-be-processed optical fiber; and the rotating device is used for twisting the to-be-processed optical fiber, so that pre-distortion force is introduced into the processing area to cause deformation, thereby forming the pre-distortion structure. The fiber grating with the pre-distortion structure is high in sensitivity, simple in manufacturing technology and low in structure complexity of the manufacturing equipment, so that the fiber grating is more suitable for practical application.

The invention relates to a double-functional amorphous FeMn-MOF-74 (ferromanganese-metal organic framework-74) nanoflower material and a preparation method and application, and relates to a nanometermaterial and a preparation method and application, which aim at solving the problem of low adsorption capacity of existing MOF-based adsorbent to As(III). The double-functional amorphous FeMn-MOF-74 nanoflower material is prepared by taking 2,5-dihydroxy terephthalic acid as an organic ligand, anhydrous manganese chloride and anhydrous ferrous chloride as metal salt ligands, and N,N-dimethyl formamide and anhydrous ethanol as solvents through a solvothermal method. The preparation method comprises the following steps of 1, preparation of a mixed solution; 2, solvothermal reaction; 3, cleaningand drying. The double-functional amorphous FeMn-MOF-74 nanoflower material is used for removing poisonous metals in water, and oxidizing the poisonous metals in the water. The preparation method canbe used for preparing the double-functional amorphous FeMn-MOF-74 nanoflower material.

The invention discloses a heat-fluid-solid coupling numerical simulation method a high-temperature fracture-cavity type reservoir. The method comprises the following steps: acquiring geometric information of fractures and karst caves of the high-temperature fracture-cavity type reservoir, and generating a discrete fracture-cavity model meeting fractal and power law distribution; and establishing aheat-fluid-solid coupling mathematical model and a numerical calculation method of the high-temperature fracture-cavity type reservoir, and performing heat-fluid-solid coupling numerical simulation on the discrete fracture-cavity model meeting fractal power law distribution. According to the method provided by the invention, the energy mass transmission rule of the high-temperature fracture-cavity type reservoir under the heat-fluid-solid coupling effect of comprehensively considering the geometric attributes of the discrete fracture-cavity network and seepage free flow coupling, the local non-thermal equilibrium effect, fracture nonlinear shear-expansion deformation and the like can be well simulated. The method is suitable for practical application, the development dynamic of the high-temperature fracture-cavity type reservoir is predicted, and main factors influencing the development dynamic of the high-temperature fracture-cavity type reservoir are determined.

The invention discloses a self-calibration method achieved on the basis of spatial spectrum false peak elimination when cross coupling in ULA and UCA is unknown. The method comprises the steps that 1, a feature vector of a noise subspace is calculated according to an output signal of an array; 2, by means of an orthogonality relation between the noise subspace and a practical steering vector in the signal direction under the cross coupling influence, a spatial spectrum is constructed, false peaks in the spatial spectrum are eliminated, and DOA is estimated through an iteration method according to positions of peak values in the special spectrum, wherein the false peaks are eliminated through two methods that the false peaks are eliminated by filtering zero points in the spacial spectrum and by normalizing the spatial spectrum; 3, the cross coupling coefficient is calculated according to an estimated value of the DOA, and the cross-coupling self-calibration method of the array is obtained. According to the self-calibration method achieved on the basis of spatial spectrum false peak elimination when cross coupling in the ULA and UCA is unknown, by means of the characteristics of the cross-coupling array in the ULA and UCA, the problem that a large number of false peaks exist in a MUSIC spacial spectrum when cross coupling is high is effectively solved, the computation cost is almost not increased, the success rate of DOA estimation is increased, and errors of DOA estimation are decreased, and self-calibration of the array is achieved when cross coupling is unknown.

The invention discloses an electropolarized particle, a preparation method thereof, and application of the electro-polarized particle to an electropolarized color-changing optical film. The electropolarized particle is a rod-like metal complex formed by chemical reaction based on metal iodide, carboxylic acid nitrogen-containing organic molecules, iodine elementary substance, cellulose suspending aid and the like. The electropolarized particle can be used for preparing the electro-polarized color-changing optical film. The electropolarized color-changing optical film comprises a substrate, and a first conductive film, an electric polarization color-changing film and a second conductive film which are sequentially arranged on the substrate. The electropolarized particle has the characteristics of simple operation, easy large-scale preparation and the like. The electropolarized color-changing optical film prepared from the electropolarized particle has the advantages of being wide in transmittance color-changing range, low in haze, high in response speed and the like under voltage driving.

The invention discloses an in-situ forming injectable hydrogel for bone-cartilage integrated restoration. The in-situ forming injectable hydrogel is prepared by the following steps of using gamma-PGA(gamma-plyglutamic acid) and GMA (glycidyl methacrylate) as the main raw materials, and generating methylacrylated gamma-PGA under the catalyzing function of DMAP (4-dimethylaminopyridine); uniformlymixing the mPGA and 4 arm PEG SH (four-arm polyethylene glycol mercapto), and forming in situ, so as to obtain the in-situ forming injectable hydrogel. The in-situ forming injectable hydrogel has goodinjectability, in-vitro forming property, biocompatibility and degradability, and has larger application potential in the field of restoration of bone and cartilage irregularity lesions.

The invention discloses modified fluorine-containing resin coating and preparation and use method thereof, and belongs to the technical field of coating. The modified fluorine-containing resin coatingcomprises the following raw materials in parts by weight: 50-200 parts of modified fluorine-containing resin, 1-5 parts of a polyamide wax micro powder, 0.1-1 part of attapulgite, 0.5-10 parts of nano titanium dioxide and 0.5-10 parts of nano-silica, wherein the modified fluorine-containing resin comprises modified polytetrafluoroethylene (PTFE), a modified polyethylene-tetrafluoroethylene copolymer (ETFE or F40) and modified polyvinylidene fluoride (PVDF). The coating prepared by using the method disclosed by the invention has super-hydrophobic, anti-corrosion and anti-radiation functions, is simple in preparation process, and is green and free of pollution.

The invention provides a graphite bipolar plate preparation method and the graphite bipolar plate. The method comprises the following steps of firstly, carrying out intercalation treatment on crystalline flake graphite, carrying out instantaneous expansion at a high temperature to obtain expanded graphite, pre-pressing the expanded graphite into plates with different densities, and carrying out pressure or vacuum impregnation in a low-viscosity organic solvent containing resin, and heating and evaporating the plate subjected to surface treatment in an oven to remove the solvent, carrying out die pressing under a vacuum condition to form a flow field, and curing to form the bipolar plate. According to the technical scheme, the density of the prepared graphite bipolar plate is 1.0-2.0 g / cm<3>, the tensile strength of the bipolar plate subjected to impregnation treatment is 25-35 MPa, the mechanical property is improved along with the increase of the resin content, the gas sealing property is good, the preparation method is beneficial to reducing the thickness of the polar plate, and batch production is easy.

The invention relates to a gradient thermal insulating layer and a preparation method and a preparation device thereof. The preparation method comprises the following steps: cutting two or more pieces of a heat insulating material according to the size of the internal surface of a to-be-heat-insulated workpiece; smearing an adhesive to the internal surface of the workpiece, bonding the cut heat insulating material on the internal surface of the workpiece in sequence, and bonding two adjacent layers of the heat insulating material; spraying steeping liquid of two or more different concentrations on the surface of the heat insulating material; and drying to obtain the gradient thermal insulating layer, wherein the heat insulating material is flexible porous heat insulating material, the steeping liquid has hardening characteristic after drying, and the spraying sequence for the steeping liquid of different concentrations is from high concentration to low concentration. The invention also provides a device for preparing the gradient thermal insulating layer. The gradient thermal insulating layer has gradually changed hardness gradient, which is more suitable for practical applications.

The invention provides an automatic gate control circuit, which comprises a master control module, a motor module, a light curtain identification module, a Uart communication module and a Can communication module; the master control module is used for starting and initializing a gate system, executing passage logic control and communicating with an upper computer, and comprises a master controller and a slave controller; the motor module carries out control on the operation of a gate-driving motor; the light curtain identification module is used for analyzing and reporting the current passage state to the master control module; the Uart communication module is used for executing communication between the master control module and the upper computer; and the Can communication module is used for executing communication between a master control board and a slave control board of the master control module. By arranging a double-controller architecture in the master control module in combination with the light curtain identification module which can effectively identify the light curtain detection state, the automatic gate control circuit realizes effective passage logic control, enhances emergency response capability to circumstances, such as overtime, reverse breakthrough, gate holding and fire alarms, and can be sufficiently applicable to practical application in high-flow gates.

The invention discloses a remediation method of heavy metal contaminated soil. The remediation method comprises the steps of applying humic acid on the surface of the heavy metal contaminated soil, turning and evenly mixing the soil with a thickness of 20-30 cm from the contaminated soil surface layer with the humic acid, reacting for 7-15 days and then pre-burying leaching device under a contaminated area of the heavy metal contaminated soil; leaching the soil by using a citric acid solution and a tea saponin solution in sequence through the leaching device, and recycling leaching liquid of the leaching device and leaching liquid containing heavy metals to process intensively after finishing leaching; then applying fruit residues on the soil surface, turning and evenly mixing the fruit residues with the soil with a thickness of 20-30 cm from the soil surface layer, intercropping sunflowers and brassica juncea, harvesting all the biomasses on the ground after the plants are ripe to process intensively. Due to the adoption of the method, high removal rates of various heavy metal ions in the soil are achieved; the soil is remediated completely; meanwhile, the method is low in cost, good in effect and easy to implement.

The invention particularly relates to a preparation method and application of a carbon-based supercapacitor electrode material. The method comprises the steps of: S1, adding natural carbon materials,poly-epoxy alkyl blocked copolymers and silica into an organic solvent and mixing uniformly; S2, pouring the mixed solution in step S1 into a mold to remove the organic solvent therein; and S3, placing the material obtained in step S2 in a high-temperature furnace, heating and carbonizing in an inert gas atmosphere, cooling and taking out the product, and putting the product in the alkali solutionto obtain an electrode material which can be applied to the supercapacitor electrode. The method is simple in process conditions, low in cost, high in controllability and excellent in stability, andis suitable for large-scale industrial production and practical application of supercapacitor electrodes.

The invention discloses a self-adaptive event triggering output feedback control method and system of a time-delay switching system. The method comprises the following steps: determining a kinetic equation of the time-delay switching system; estimating an unknown state variable according to a switching state observer, and converting the kinetic equation to obtain a state error equation; carrying out Lyapunov-Krasovskii functional compensation on the state error equation to obtain time lag, and constructing a virtual controller by defining a virtual control rate and an adaptive rate; and under the event triggering mechanism, controlling the time-delay switching system based on the virtual controller, so that any MDADT in a signal of the time-delay switching system is bounded during switching. By fusing the event trigger control strategy and a backstepping control method, a self-adaptive event trigger controller is constructed, and the problem of resource waste caused by a traditional time-driven control method is solved; compared with other methods, the modal-dependent average residence time method is more suitable for practical application.

The present invention proposes a ring-shaped optical fiber with an asymmetric grating and its application in orbital angular momentum generation. Hollow-core ring fiber can increase the effective refractive index difference between quasi-degenerate modes, thereby avoiding crosstalk between modes. The long-period grating inscribed on the half-ring of the hollow-core ring fiber breaks the circular symmetry structure of the fiber and realizes conversion between angular modes of non-same order. When the input light is a circularly polarized fundamental mode, a first-order orbital angular momentum mode can be generated. The hollow core of the hollow-core ring fiber is filled with optical functional materials with adjustable refractive index. The wavelength that generates the orbital angular momentum mode can be tuned by the refractive index of the liquid. Therefore, this structure can generate the orbital angular momentum mode within an adjustable broadband wavelength range. The simulation shows that when the grating period is 292μm and the grating length is 1.460cm, the angular momentum mode conversion rate is higher than 90% in the broadband wavelength range up to 237nm, and the maximum conversion rate is 98.91%. The refractive index of the filled liquid has an impact on the orbital angular momentum mode. The wavelength modulation rate is 7400nm / RIU.

The invention discloses a composite catalyst for catalytic oxidation of formaldehyde at a room temperature. The catalyst is composed AlOOH and MnO2. The invention also discloses a preparation method of nanometer sheet-shaped AlOOH powder, and further discloses a preparation method of the AlOOH / MnO2 composite catalyst. AlOOH is reacted with KMnO4 and a surface hydroxyl group in the AlOOH is reactedand combined with the KMnO4 to form the AlOOH / MnO2 composite catalyst. The composite catalyst prepared by the preparation method can efficiently degrade formaldehyde at a room temperature, and the preparation method is simple, low in cost and easy in popularization and application.

The invention provides a hot spot temperature analysis method for isolating switch dynamic capacity increase, relates to the technical field of dynamic capacity increase of isolating switches. The method comprises the following steps: carrying out thermodynamic analysis on the isolating switch, and establishing a steady-state thermal circuit model of the isolating switch according to an analysis result and external environment parameters, the steady-state thermal circuit model comprising a plurality of thermodynamic parameters; performing physical modeling on the isolating switch to obtain a physical model of the isolating switch, and performing finite element simulation calculation on the isolating switch according to the physical model to obtain each thermodynamic parameter; and inputting each thermodynamic parameter into a pre-established steady-state thermal circuit model to obtain the hot spot temperature of the isolating switch. The method is simple and rapid in calculation process, less in required parameters, easy to implement and wide in application range; the calculation accuracy is effectively improved by establishing a physical model; the influence of external environment parameters on the hot spot temperature is comprehensively considered; the method can effectively predict the safety operation time of dynamic capacity increase of the isolation switch, is easy to popularize and implement, and has good economic benefits.

The invention belongs to the field of enhanced heat transfer, and discloses a method for enhancing the heat transfer performance of a nano suspension. The invention aims to solve the technical problem that the heat transfer performance of the nano suspension is weakened due to unstable and lasting thermophysical performance caused by poor dispersion stability of the nano suspension. According to the properties of nanoparticles and nanocapsules, the type and the concentration of the surfactant are reasonably regulated and controlled, the nano-suspension which is uniformly dispersed and has excellent thermophysical properties is prepared by adopting a two-step method, the nano-suspension is applied to in-tube flow heat transfer, the flow and heat transfer characteristics of the nano-suspension are comprehensively analyzed, and the enhanced heat transfer degree is judged. The method can be applied to experimental pipelines with the pipe diameter range of 0.5-2 cm and the Reynolds number range of 3000-10000. According to the method, the application range of the nano-suspension is widened, and a basis is provided for practical application of the nano-fluid.

The invention proposes a high-sensitivity optical fiber curvature sensing structure with temperature insensitivity. The three-core optical fiber is used as the central sensitive element, and the three cores of the three-core optical fiber are arranged in an equilateral triangle. The broad-spectrum light enters the multimode fiber 9 through the single-mode fiber 3, excites multiple transmission modes, and the transmission mode field becomes larger, and then enters the three-core fiber 10, and the three core modes independently transmit a distance L and then re-enter the multimode fiber 9 , at this time, the light of the three modes interferes, the light signal is modulated, and then continues to propagate forward in the single-mode optical fiber 3 in a single-mode form, and is finally recorded by the spectrum analyzer 2 . The amount of curvature change can be estimated by detecting the shift amount of the interference spectrum. The experimental results show that the optical fiber sensing structure can measure the bending curvature and obtain good linear characteristics, and the measurement sensitivity can reach ‑28.29nm / m‑1 when the curvature range is 2.79 m‑1~3.24 m‑1.

The invention provides a polyethyleneimine imprinted polymer probe, and a preparation method and application thereof. The polymer probe comprises cross-linking agent polymerized and modified polyethyleneimine and fluorescein grafted onto the polyethyleneimine, wherein the polyethyleneimine contains plural imprinting of metal ions. The probe has highly-specific metal ion identifiability, adsorptivity and anti-interference capability, can realize precise identification, detection and adsorption of target metal ions in mixed metal ions in a water body and is suitable for promotion and application to fields like water quality detection, metal ion identification, metal ion adsorption, etc.