263 results about "Optical fiber probe" patented technology

The invention discloses a water quality heavy metal pollution detection method and system based on Raman spectrum.The water quality heavy metal pollution detection method comprises the steps that water body Raman scattering light is collected in situ through a miniature optical fiber probe, and a continuous time sequence spectrum signal flow is generated; wavelet transform is combined with self-adaptive threshold setting, and high-frequency noise and effective spectral signals are separated; dynamically strengthening the characteristic peak of the target heavy metal through a frequency domain characteristic screening module, and inhibiting a water molecule interference peak at the same time; generating a cross-domain fusion feature vector; processing the fusion feature vector through a pre-trained heavy metal concentration prediction model, and outputting concentration prediction values of various heavy metals; a confidence score is dynamically calculated based on a deviation between a current predicted value and historical data distribution, and model parameter update and system calibration are automatically triggered. The method has the advantages that through acousto-optic signal cross-domain fusion and closed-loop self-calibration, the target peak is dynamically strengthened while water molecule interference is inhibited, and the real-time performance, the anti-interference performance and the prediction precision of heavy metal detection are improved.

The invention provides a micro-nano optical fiber probe for biochemical component detection based on infrared spectroscopy and detection equipment, and a preparation method of the micro-nano optical fiber probe comprises the following steps: S1, selecting one section of a multimode quartz optical fiber as a sensing area, and then removing a cladding layer and a coating layer of the sensing area to expose a bare fiber; s2, dripping a mixed acid solution prepared from hydrofluoric acid and citric acid to the bare fiber to corrode the bare fiber, and then cleaning and blow-drying; immersing the treated multimode quartz optical fiber into a silane coupling agent solution, reacting for 0.5-1 hour, and then drying; s3, immersing the multimode quartz optical fiber treated in the step S2 into a solution containing silver nanoparticles, and reacting for 10-20 minutes to obtain an optical fiber modified by the silver nanoparticles; and S4, sputtering a gold layer on the surface of the silver-modified optical fiber by adopting a vacuum magnetron sputtering technology to obtain the micro-nano optical fiber probe with the silver-gold film layer. After the surface of the silver nanostructure is covered with the gold film, oxygen, water, corrosive molecules and the like are effectively prevented from making direct contact with silver. In addition, both the gold and the silver can support a surface plasmon resonance (SPR) effect, and particularly, the prepared detection equipment can ensure the sensitivity of the SPR.

The invention discloses a Raman spectrum-based online detection method for glucose and ethanol in a yeast fermentation process. The Raman spectrum-based online detection method specifically comprises the following steps: preparing a yeast seed solution, and inoculating the yeast seed solution into a fermentation tank for fermentation; in the fermentation process, an immersion type Raman optical fiber probe is used for collecting a Raman spectrum in real time, and meanwhile sampling is conducted at regular time to measure the concentration of glucose and ethanol; sequentially carrying out median filtering, adaptive iteration reweighted penalty least square method (airPLS) baseline correction, Savitz-golay (SG) smoothing processing and characteristic peak normalization on the acquired spectrum; respectively establishing concentration prediction models of glucose and ethanol by adopting a PLS1 algorithm; and applying the model to a subsequent batch fermentation process to realize online prediction of glucose and ethanol. According to the method, manual sampling is not needed, prediction is accurate, operation is easy and convenient, and in-situ online detection of glucose and ethyl alcohol in the yeast fermentation engineering can be achieved.

The invention discloses a rotor and stator axial clearance online measuring device and method based on optical carrier microwave interference. The measuring device comprises a broadband light source, a first polarization maintaining optical fiber, an electro-optical modulator, a second polarization maintaining optical fiber, an optical fiber circulator, a first single-mode optical fiber and a coated optical fiber probe which are connected in sequence, and the coated optical fiber probe directly faces the axial end face to be measured; a first port of the optical fiber circulator is connected with the second polarization maintaining optical fiber, a second port of the optical fiber circulator is connected with the first single-mode optical fiber, and a third port of the optical fiber circulator is sequentially connected with the second single-mode optical fiber, the photoelectric detector, the signal conditioning unit, the signal acquisition unit and the digital processing unit; the signal acquisition unit is connected with the micro-control unit, the micro-control unit is connected with the microwave frequency sweep signal generation unit, and the microwave frequency sweep signal generation unit is connected with the electro-optical modulator. According to the invention, non-contact on-line high-precision measurement of the axial clearance of the rotor and the stator of the aero-engine under the conditions of limited measurement space and complex signal leading-out path can be realized.

The invention discloses a quick response capability detection device for a high-precision electromagnetic valve, and relates to the technical field of electromagnetic valve detection, the quick response capability detection device comprises a positioning frame and a transmission table, a sliding rod arranged on the positioning frame is sleeved with the transmission table in a sliding connection mode, and valve body positioning tools are fixed to the side wall of the transmission table at equal intervals through bolts; the miniature optical fiber sensing module and the high-frequency response pressure sensor are integrated, synchronous measurement of valve element displacement and outlet pressure is achieved, the limitation of single parameter measurement is overcome, meanwhile, the miniature optical fiber probe is adopted for detecting the valve element displacement through the miniature mounting hole in the valve body, the influence on valve element movement is reduced, and the measurement precision is improved. The problem that the structure of the electromagnetic valve needs to be greatly changed in a traditional direct detection method is avoided, the drift diameter of a flow channel is adjusted through rotation of a layer sleeve block in the phase change regulation and control mechanism in the initial detection stage, multi-working-condition simulation from low-pressure large flow to high-pressure small flow is achieved, and the detection condition is closer to the actual working environment of the electromagnetic valve.

The invention discloses an intelligent dynamic regulation and control method for compaction quality of a high-liquid-limit fly ash roadbed, which comprises the following steps of: establishing a mapping relation among high-spectral characteristics of high-liquid-limit fly ash, a specific surface area index, a total hydroxyl content and a water content through a first neural network model, and establishing an optimal water content prediction model through a second neural network model; the third to fifth neural network models construct the correlation of the compactness, the dielectric constant, the rigidity and the water content; two-stage water content regulation and control of a storage yard and a paving layer are realized through hyperspectral imaging of an optical fiber probe and an unmanned aerial vehicle, and pre-humidification and secondary precise regulation and control are performed in combination with an intelligent spraying system; in the compaction stage, data are collected in real time through a multi-frequency ground penetrating radar and a vibration sensor, compaction degree distribution is inverted, layered evaluation is conducted, and rolling parameters are dynamically adjusted. According to the invention, a hyperspectral technology, multi-source sensing and deep learning are fused, intelligent management of compaction quality is realized, and construction uniformity and quality stability of the fly ash roadbed are significantly improved.

The application provides a current measurement device based on diamond NV color centers, which comprises a microwave source circuit unit configured to output a microwave signal; a diamond NV color center optical fiber probe group unit comprising a plurality of optical fibers, the top end of each optical fiber being provided with a diamond NV color center, and the top end of the plurality of optical fibers having different distances from a wire to be measured; the diamond NV color center optical fiber probe group unit is configured to receive the microwave signal and feed back the microwave signal to the microwave source circuit unit, so that the microwave source circuit unit outputs a microwave signal with a desired frequency according to the feedback to match the energy level resonance frequency of the diamond NV color center under different magnetic field strengths; and a current measurement unit configured to measure the current according to the energy level resonance frequency of the diamond NV color center. According to the embodiment of the application, the magnetic field generated by a larger current wire can be detected by using a lower frequency microwave signal through simultaneous detection of a plurality of diamond NV color centers spaced apart from the wire to be measured by a specific distance.

The invention discloses a time-resolved LIBS (laser-induced breakdown spectroscopy) system and a sample component analysis method and product thereof, and relates to the field of laser-induced breakdown spectroscopy. After the sample is irradiated by the ablation laser, plasma is generated; in the plasma expansion and cooling process, excited state atoms and ions are subjected to energy level transition, and a characteristic radiation spectrum is released; the delay control module sets different delay time so as to control the working time interval of the laser generator and the spectrograph; the spectrograph receives the characteristic radiation spectrums at different delay times by using an optical fiber probe, stimulates the characteristic radiation spectrums at the integration time, and determines characteristic radiation spectral lines of different elements; and the computer analyzes the characteristic radiation spectral lines, determines spectral line intensities of different elements, and determines a component result of the sample in combination with the calibrated spectral line intensities and the element content function curve so as to improve the accuracy of the component result of the sample.

The invention discloses a circuit breaker plum blossom contact contact stroke intelligent detection method and system, and the method comprises the steps: a configuration step: a static contact is configured with an optical fiber sensing array, an image collection module and a light supplement module, the optical fiber sensing array comprises an optical fiber sensor, the optical fiber sensor comprises an optical fiber probe, and a matched optical fiber cable and an optical fiber amplifier, the image acquisition module comprises an industrial camera; a dynamic detection step: comprehensively scheduling an optical fiber sensor and an industrial camera, and collecting displacement data of a contact piece of the moving contact and connection state data of the closed moving contact and static contact in real time; a data processing step: fusing the displacement data of the optical fiber sensor and the image data of the industrial camera, evaluating the contact state and surface defects of the static contact and the moving contact, embedding a lightweight AI reasoning chip to carry out localization real-time processing, and adopting a contact wear compensation algorithm to carry out real-time processing on the basis of the contact closing times and historical wear data. Dynamically adjusting the detection threshold value of the optical fiber probe and the parameters of the contact state evaluation model.

The present invention relates to the technical field of detecting trace elements in fruits, and particularly relates to a device and a method for measuring the vitamin C content of kiwifruit. The measuring device includes a detection box and a rotary motor, and the output shaft of the rotary motor is fixedly connected to a first pressing block; a thrust device is arranged in the detection box, and a second pressing block is rotatably installed on a sliding plate; a plurality of optical fiber probes are arranged on the detection box; a box body is arranged on the detection box, the box body includes a first brush plate and a second brush plate, a brush sleeve is arranged on the first brush plate, brush filaments are arranged on the second brush plate, brush holes are formed in the side wall of the brush sleeve, a contact end for contacting the surface of the kiwifruit is arranged on the brush sleeve, the brush filaments include a brush rod and a brush filament body, and the brush filament body is used for brushing off the fluff on the kiwifruit; the distance between the first brush plate and the second brush plate is adjustable. In this application, for kiwifruits with different surface colors, different thicknesses of fluff are retained on their surfaces to reduce the influence of the surface color and luster differences of kiwifruits on the detection results and improve the accuracy of detection.

The invention relates to the technical field of pressure sensing, and discloses a high temperature and pressure integrated measurement sensor, which comprises an optical fiber assembly and a diaphragm assembly which are fixedly connected with each other, the optical fiber assembly comprises an optical fiber base, and an optical fiber probe assembly is arranged in the optical fiber base; the diaphragm assembly comprises a diaphragm base welded to the optical fiber base, the bottom of the optical fiber probe assembly is located in the diaphragm base, a pressure sensing hole is formed in the bottom of the diaphragm base, sapphire glass and a pressure sensitive diaphragm are arranged above the pressure sensing hole, and the pressure sensitive diaphragm is connected with the bottom of the diaphragm base in a sealed mode. A vacuum cavity is arranged between the sapphire glass and the pressure sensitive diaphragm; compared with an existing pressure sensor based on the electrical principle, the sensor has the advantages of being high in high-temperature resistance, good in vibration resistance, small in assembling and debugging difficulty and capable of achieving temperature and pressure integrated measurement, and the problem that an existing sensor cannot be used in the extreme environments of high temperature, strong vibration and the like is solved.

The invention discloses a BNCT target disc temperature detection system and method. The method comprises the steps that a magneto-optical film with the thickness of 20 + / -1 nm grows on the back surface of a rotating lithium target through magnetron sputtering; a dual-wavelength laser interference light source is introduced into a vacuum target chamber through a coaxial optical fiber probe to form a dual-cavity interference link; the magneto-optical film generates nanoscale displacement by using centrifugal force generated when the rotary lithium target rotates, so that the instantaneous temperature rise of the rotary lithium target is amplified into a phase polarization composite signal capable of being optically detected; the integrated micro slip ring coupling optical path is used for coupling the phase polarization composite signal to a static end photoelectric detector; a phase polarization composite signal output by the photoelectric detector is input into the field programmable gate array, and the transient micro-area temperature field of the rotating lithium target is solved in real time; and the generated transient micro-area temperature field is used as a boundary condition for driving, so that closed-loop verification and temperature control protection of the rotating lithium target are realized. According to the invention, millisecond-level temperature control protection of the ultrathin rotary lithium target can be realized.

The invention discloses a GIS internal partial discharge optical signal detection and positioning system and method. The system comprises a GIS internal discharge optical signal detection module, a GIS internal partial discharge optical signal simulation module and a GIS internal discharge optical signal positioning algorithm module. The discharge detection and positioning method provided by the invention comprises the following steps: firstly, arranging a plurality of fluorescent optical fiber probes in a cavity in a GIS (Gas Insulated Switchgear), and obtaining the intensity of optical signals received by different fluorescent optical fibers during discharge at different positions through a simulation method; secondly, performing relative intensity processing on the intensity of the received optical signal to obtain a relationship between the relative intensity of the optical signal received by the fluorescent optical fiber and a discharge position, and establishing a sample database; inputting the sample into a deep neural network for training to obtain a discharge position detection model; and finally, verifying the model through test data, thereby proving the reasonability of model discharge position prediction.

The present invention discloses a device for measuring the steady-state deformation of rotating blades inside a casing, comprising a data acquisition and processing system, an optical fiber array, and an optical fiber probe group. The optical fiber probe group includes at least two optical fiber probes, which are mounted on the casing along the chord direction. The axial position of each optical fiber probe relative to the rotating shaft is different. The optical fiber array has optical fibers that match the number of optical fiber probes. The optical fiber probes are connected to the data acquisition and processing system via the optical fibers of the optical fiber array. The data acquisition and processing system collects and processes the data collected by the optical fiber probe group. The data acquisition and processing system is configured to calculate the steady-state deformation of the blades. The present invention also discloses a method for measuring the steady-state deformation of rotating blades inside a casing. The present invention can simultaneously obtain three parameters: circumferential translation, axial translation, and anti-torsion angle, with high calculation accuracy.

An automatic sample adding and detecting device for a biological chip relates to the technical field of biological chip detection and comprises a platform, a coordinate positioning mechanism, a supporting plate, a biological chip, a sealing plate, a detection hole, an automatic buffer solution feeder and a biological sample feeder, and the automatic buffer solution feeder and the biological sample feeder are identical in structure. Each feeder comprises a feeder body and a driving mechanism used for controlling the feeder body to quantitatively discharge liquid, a support is further fixedly arranged at the top end of the platform, an optical fiber probe is arranged on the support, and a shooting camera is arranged on the support on one side of the optical fiber probe. The liquid adding device does not need frequent sampling, can ensure that the liquid adding amount each time is consistent, avoids the tedious structure and operation of repeated sampling, promotes the detection result to be more accurate due to the uniform liquid adding amount, and is simple in structure, convenient to use, low in manufacturing cost, convenient to maintain and suitable for popularization and use.

The application discloses a high-temperature and high-pressure combustion chamber spectrum characteristic transmission device based on a special optical fiber probe head, which comprises an optical fiber probe head, a light guide optical fiber, a light emitting characteristic analysis device and a cooling liquid pump; the optical fiber probe head comprises high-transmittance optical glass, a metal cooling sleeve and an optical flange; the high-transmittance optical glass can transmit ultraviolet-visible light with a wavelength of 100-760 nm; the metal cooling sleeve comprises a cylindrical sleeve and a connecting cap; the cylindrical sleeve is coaxially arranged on the outer periphery of the high-transmittance optical glass and is sealingly arranged in a probe head mounting hole; the light guide optical fiber can collect the ultraviolet-visible light transmitted through the high-transmittance optical glass and is connected with the light emitting characteristic analysis device; and the cylindrical sleeve and the connecting cap are both provided with cooling channels connected with the cooling liquid pump. The application can analyze the chemical reaction light emitting characteristics in the high-temperature and high-pressure combustion chamber in real time, is especially suitable for monitoring the spontaneous radiation characteristics of OH*, CH* and C2* groups generated in the combustion process, and thus can determine the reaction region and the reaction heat release.

The invention discloses a composite optical fiber probe of an integrated electrode array and a preparation method of the composite optical fiber probe, and relates to the technical field of photoelectron, and the composite optical fiber probe of the integrated electrode array comprises an optical fiber matrix, a microchannel array, a metal microwire array and a packaging layer. The micro-channel array comprises at least one groove, and each groove is formed in an external cladding of the optical fiber substrate; the metal microwire array comprises at least one metal microwire, and the metal microwires are embedded into the grooves of the microchannel array respectively; the packaging layer is filled in the groove, the metal microfilament is embedded and fixed in the groove, and the packaging layer and the outer surface of the external cladding form a continuous integral surface. According to the composite optical fiber probe integrated with the electrode array, compatibility of the quartz-based optical fiber and the metal electrode array material, flexible layout of the electrodes and customizable integration are achieved, the excellent optical transmission performance of the quartz-based hollow-core optical fiber is utilized, diversified optical signal modes are supported, and high-precision volume illumination control can be achieved.

The utility model discloses a femtosecond pulse laser filament control system, which comprises a laser transmitter, a power meter, a target chamber, a beam collector, a vacuum pump, an optical fiber probe and an optical fiber spectrometer, a reflecting mirror I and a diaphragm are arranged between the laser transmitter and the power meter; a convex lens I is arranged between the reflecting mirror II and the target chamber; one side of the target chamber is provided with a light hole, the light hole is opposite to the optical fiber probe, a convex lens II is arranged between the light hole and the optical fiber probe, the optical fiber probe is connected with an optical fiber spectrometer through an optical fiber, and the optical fiber spectrometer is used for being connected with an upper computer; wherein the vacuum pump is communicated with the interior of the target chamber. According to the utility model, the size of the laser beam can be adjusted, the length of the laser filament can be controllably adjusted, and the influence of different environments on the spectral signal-to-noise ratio can be obtained, so that a stable and reliable basis is provided for a subsequent controllable LIBS (Laser-induced Breakdown Spectroscopy) experiment.

The invention discloses a temperature measuring device based on a fluorescent material, and the device comprises a housing which comprises an upper cover, a housing pedestal, an LED light source, a fluorescent material, an optical fiber probe, an optical fiber spectrometer, an optical fiber, a console, a display screen, a charging device, a charging hole, a charging line, and a data exchange interface. The temperature measurement method based on the fluorescent material comprises the steps of database input, fluorescent material excitation, light sample collection, light component analysis, light parameter transmission, temperature value calculation and temperature value feedback.

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 invention discloses a tumor detection device and method based on a diamond quantum sensor, and belongs to the technical field of biomedical detection. The device comprises an optical fiber laser, an optical fiber beam splitter, an optical fiber attenuator, an optical fiber circulator, an optical filter, two photoelectric detectors, a differential amplifier, an electronic filter, a computer, a signal generator, two microwave antennas and an optical fiber probe. The optical fiber probe comprises an optical fiber packaged in a plastic shell, a diamond quantum sensor which is fixed at the tail end of the optical fiber and comprises an NV color center, and a first microwave antenna integrated beside the optical fiber. The laser excites the diamond to generate fluorescence, meanwhile, the signal generator drives the two microwave antennas to apply a microwave field, and the dielectric property of the sample to be detected modulates the fluorescence intensity of the diamond by influencing the microwave field. Laser noise is eliminated through a differential amplification and filtering technology, and fluorescence signal change is analyzed by a computer, so that dielectric constant distribution of a sample is reconstructed, and non-invasive and high-sensitivity detection of tumors is realized.

The utility model relates to an optical fiber probe for near-infrared brain function imaging detection. The optical fiber probe comprises a mounting base, a probe cap, a probe main body and a probe shaft cover, the mounting base is arranged on the detection helmet, and a mounting groove is formed in the mounting base. One end of the probe cap is connected with the fiber. The probe main body is arranged at the other end of the probe cap and penetrates through the mounting groove to be in contact with the head of a tester, and a limiting boss is fixedly sleeved on the probe main body. The probe shaft cover is movably sleeved between the limiting boss and the probe cap and is in threaded connection with the top of the mounting base, a limiting spring sleeved on the probe main body is arranged between the limiting boss and the probe shaft cover, and the probe shaft cover is matched with the mounting base to movably limit the probe main body. The probe main body is fixed in the mounting base and cannot be pulled out under the limiting of the limiting boss; and the limiting boss is matched with the limiting spring to move up and down or rotate the probe main body to adjust the position, so that the bent and knotted optical fiber is arranged or the signal of the optical fiber probe is adjusted.

The embodiment of the invention provides an optical fiber probe. The optical fiber probe comprises a probe main body and an optical path component, the probe main body is provided with a first incident light path and an emergent light path; the optical path component comprises a reflection assembly and a probe window assembly, the reflection assembly is provided with an incident area and an emergent area, the reflection assembly and the first incident light path are arranged in a spaced mode to form a spaced space, the probe window assembly comprises a first window piece and a second window piece, and the first window piece and the second window piece are spaced to form a liquid passing opening communicated with the outside. A first light path passing through the second window sheet, the liquid passing opening and the first window sheet is formed between the first incident light path and the incident area; the emergent area and the emergent light path are sealed and form a second light path, and the propagation directions of light in the first light path and the second light path are different. According to the optical fiber probe, the risk that bubbles stay at the liquid passing opening can be reduced, an optical signal is effectively prevented from penetrating through the bubbles to cause an abnormal spectral signal, and the measurement result is more accurate.

The present invention discloses a method and a system for detecting the water content of crude oil based on a spiral optical fiber probe; the method includes: placing crude oil in a container; one or more spiral optical fiber probes made of single-mode optical fiber are dispersedly placed in the container; the probes are perpendicular to the bottom surface of the container and in contact with the bottom surface; the height of the probes is not less than the height of the container; the inner wall of the container and the surface of the spiral optical fiber probes are both sprayed with superhydrophobic and superoleophobic materials to promote the upper and lower separation of oil and water in the crude oil; after realizing the upper and lower separation of oil and water, input light waves into the spiral optical fiber probe by using a laser light source; use a spectrometer to detect the light waves reflected or transmitted from the spiral optical fiber probe to obtain detection spectral data; determine the current liquid level height and the height of the oil-water interface in the container based on the detection spectral data; calculate the water content of the crude oil based on the liquid level height and the height of the oil-water interface. The present invention can improve the detection efficiency of the water content of crude oil.

The utility model provides a high-precision keyboard LED lamp lumen test fixture, which comprises a bottom plate, a support plate, an upper cover plate, an optical fiber sleeve assembly and an optical fiber probe, the optical fiber sleeve assembly comprises a hard protective sleeve and an elastic shading sleeve, the upper end of the hard protective sleeve is in sliding connection with a mounting hole, and the lower end of the hard protective sleeve is in sliding connection with the elastic shading sleeve. The elastic shading sleeve comprises a fixed pipe sleeve, a limiting pipe sleeve and a shading telescopic sleeve which are integrally arranged, the fixed pipe sleeve is fixed to the lower end of the hard protective sleeve, the limiting pipe sleeve surrounds the periphery of the hard protective sleeve, the lower end of the limiting pipe sleeve is fixed to the upper end of the fixed pipe sleeve, and the upper end of the limiting pipe sleeve makes contact with the lower end face of the upper cover plate; the upper end of the shading telescopic sleeve is fixed to the lower end of the fixed pipe sleeve, the lower end of the shading telescopic sleeve is an elastic telescopic end, a detection cavity is formed in the shading telescopic sleeve, and the lower end of the optical fiber probe is fixed to the lower side of the hard protective sleeve. And the accuracy of LED lamp lumen detection is improved.

The application discloses an engine rotor multi-parameter measurement system and method, and the system comprises a first optical comb, a second optical comb, a polarization maintaining optical fiber amplifier, a polarization maintaining optical fiber beam splitter, an integrated polarization maintaining optical fiber ring, an integrated polarization maintaining optical fiber beam combiner, a plurality of high-temperature-resistant optical fiber probes, a high-speed photoelectric detector and a data acquisition and processing system; the pulse repetition frequency of the first optical comb is greater than that of the second optical comb, and the two have a high repetition frequency difference; the plurality of high-temperature-resistant optical fiber probes respectively generate reference light pulses and measurement light pulses; the scanning light pulses emitted by the second optical comb respectively interfere with the plurality of reference light pulses and the plurality of measurement light pulses to generate double-comb interference reference signals and double-comb interference measurement signals; through processing of the reference signals and the measurement signals of each channel, the engine rotor speed, the blade tip clearance, the blade tip timing and the blade vibration parameters are obtained. The application has the advantages of high measurement speed, high measurement accuracy and multi-parameter synchronous measurement.

The present disclosure provides a method and device for detecting the temperature of a cable joint, an electronic device, and a storage medium, belonging to the technical field of optical fiber temperature measurement. The method includes: determining a target acquisition duration based on the attributes of the cable joint and the characteristics of the fluorescent material, and determining a target acquisition frequency based on the attributes of the cable joint and the characteristics of the fluorescent material; the fluorescent material is the fluorescent substance in the optical fiber probe of the optical fiber temperature sensor; performing temperature measurement on the cable joint based on the target acquisition duration and the target acquisition frequency to obtain a first temperature; and calibrating the first temperature based on the environmental information where the cable joint is located to obtain a second temperature of the cable joint. The present disclosure can reduce the temperature measurement error of the cable joint and improve the accuracy of temperature measurement.

This invention provides a full-link detection device and method for laser interferometric velocimetry systems, relating to the field of transient photoelectric testing technology. The detection device includes a pulse injection module, a signal transmission and conversion module, and a signal acquisition and analysis module. The pulse injection module includes a nanosecond pulse laser and a coupler. The coupler is connected in series between the output end of the fiber laser and the first port of the circulator. The nanosecond pulse laser, after being coupled by the coupler, is transmitted along the entire system link and converted into an electrical signal by a photodetector. The data acquisition unit acquires the signal, and the analysis unit analyzes the characteristics of the electrical signal to achieve full-link status detection. This invention can identify and locate fiber optic path breaks, determine the working status of the fiber optic probe, and predict the intensity of the interference signal in the formal experiment. Even after the system is fully solidified before the experiment, it can still monitor the entire link status in real time, effectively improving the operational reliability and efficiency of the laser interferometric velocimetry system.

The application discloses a urine small extracellular vesicle PLA2R1 membrane protein detection method for distinguishing membranous nephropathy, and belongs to the technical field of biomedical detection. The detection method comprises the following steps: preparing an anti-CD63 antibody surface fixed plasmonic metasurface sensing chip to directly capture small extracellular vesicles in urine; preparing an anti-PLA2R1 antibody modified biofunctionalized gold nanoparticle complex to specifically combine with the PLA2R1 membrane protein on the surface of the small extracellular vesicles; detecting the reflection spectrum of the chip after antibody fixation and gold nanoparticle combination through a spectrometer with an integrated optical fiber probe; calculating the resonance wavelength shift amount; measuring the expression level of the PLA2R1 membrane protein; and realizing accurate distinction of healthy people, membranous nephropathy gray area and confirmed patients. The non-invasive detection method is simple in operation and rapid in detection, the sensitivity and the specificity are improved by means of the gold nanoparticle signal amplification effect, and is suitable for large-scale clinical screening and early diagnosis.

The invention relates to a coaxial beam splitting optical fiber probe for spectrum detection and shape self-sensing, the optical fiber probe is formed by annularly distributing a plurality of functional optical fibers around an excitation optical fiber (3), the front end of the optical fiber probe is a conical probe tip (1), the middle section of the optical fiber probe is a bendable beam concentration section (2), and the functional optical fibers comprise a shape sensing optical fiber (4) and a spectrum receiving optical fiber (5). The optical fiber probe is simple and convenient in detection process and can be widely applied to real-time detection; the three-dimensional shape sensing function is integrated, the three-dimensional shape of the front half section of the probe can be obtained in real time, the shape self-sensing function is achieved, and target detection is more flexible and more accurate.