96results about How to "Strong anti-electromagnetic interference" patented technology

The invention discloses a measuring device and method for a trap parameter of solid dielectric. The solid dielectric material is charged by using a three-electrode corona discharge system; a material sample to be tested is placed below a single-needle electrode and a metal mesh electrode; the sample is adhered to a metal disc electrode through conductive silicone grease and is charged by the three-electrode system; after charging is ended, an external voltage is removed, and short circuit discharge is performed to remove surface free loads; surface potential of the measured sample is attenuated; and the trap energy level and the trap density parameter of the material can be calculated through a signal conditioning circuit and a data acquisition system. The measuring device comprises a constant temperature box, the three-electrode coronate charging system, a surface potential measuring system, a sample preheating system, a rotary electrode and a temperature and humidity control system. The invention provides an effective analysis means for research in representation of an aging condition of a polymer insulating material and an aging rule of polymer by the trap parameter and research in aspects such as a solid dielectric surface electrification phenomenon and surface flashover performance influence.

The invention discloses a clock synchronization system for an optical fiber transmission channel. The clock synchronization system comprises a clock and SYNC processing sub-system, a signal transmission sub-system, a clock phase position adjustment sub-system and an SYNC resampling sub-system, wherein the clock and SYNC processing sub-system distributes clocks and SYNC signals for different remotenodes; the signal transmission sub-system is used for finishing optical/electrical and electrical/optical conversion and transmission of the signals; the clock phase position adjustment sub-system isused for adjusting clock phase positions in real time; the SYNC resampling sub-system is used for finishing phase position realignment between the clocks and the SYNCs; the clock and SYNC processingsub-system comprises a clock cycle delayed distribution module, and an SYNC distributing and receiving module; the signal transmission sub-system comprises an electrical-to-optical module, an opticalfiber transmission module and an optical-to-electrical module; and the clock phase position adjustment sub-system comprises a phase-locked loop module and a changeable phase position delay module. Theinvention further comprises a method using the clock synchronization method for the optical fiber transmission channel. According to the clock synchronization method for the optical fiber transmission channel and the method thereof, clock synchronization and sampling synchronization functions between all remote measuring nodes and a local data processing center can be effectively finished, different lengths of optical fibers can be adapted, and the system structure is simple.

A coal mine working face rib fall monitoring system based on fiber grating and three dimensional laser scanning belongs to a coal mine working face rib fall identification monitoring system; a ground data processing system of the identification monitoring system is connected with a downhole data transmission system through a transmission fiber; the data transmission system is connected with a downhole data acquisition system through a fiber pigtail; the working face three dimensional coordinate data and angle values are obtained through three dimensional laser scanning; fiber grating sensors arranged in the downhole can monitor the working face roof pressure, the hydraulic support working resistance, the roof sinkage and the temperature information; the advantages are that the monitoring system uses the features that the three dimensional laser scanning process is fast in measurement, strong in penetrability and visualization, and needs no contact; the fiber grating technology is strong in anti-electromagnetic interference ability under downhole severe environment, thus providing accurate and timely monitoring data for the ground, returning processed data to the underground, preventing downhole calamities, and ensuring the downhole production safety and personnel personal safety.

The invention discloses an oil and gas pipeline corrosion and leakage monitoring and early warning system and method based on OFDR optical fiber sensing. The system comprises distributed optical fiberstrain sensors, distributed optical fiber temperature sensors, a pipeline internal pressure sensor, an OFDR optical fiber data automatic acquisition device, a pavement base station, a pavement base station information display and transmission system, a solar power supply system, a 5G signal transmission system, an optical fiber data processing and analysis system and a display early warning system. The strain sensors annularly laid on the surface of a pipeline are used for monitoring pipeline corrosion through hoop strain, and the pipeline leakage is monitored by the linear laid optical fibertemperature sensors. After the OFDR data acquisition device sends data to the pavement base station information display and transmission system, the hoop strain data or the pipeline surface temperature is transmitted to the optical fiber data processing and analysis system through the 5G transmission system, and the display early warning system monitors and conducts early warning after comparingthe result with a preset alarm value. According to the system, the degree and the size of corrosion are determined through data comparison, the change of the temperature of the outer wall of the pipeline caused by leakage of the oil and gas pipeline is monitored, and remote and site simultaneous monitoring is realized through the pavement base station.

The invention discloses a method for automatically reading a reading number of a pointer meter. The method comprises the steps of performing image collection, shooting an image comprising a meter front surface by utilizing a camera device to serve as a training sample; performing sample making, making the collected image into an image of a meter part through manual calibration to serve as a positive sample, and randomly generating an image of a background part to serve as a negative sample; performing image feature extraction, extracting digital features from the positive and negative samplesto serve as a training set; performing classifier training, obtaining a trained classifier based on the training set, for a new input image, predicting the most possible position of the meter by utilizing the classifier SVM, and extracting a meter image; performing image preprocessing, removing interferences such as shadows and the like for the extracted meter image through an image processing method; identifying a pointer and a dial plate of the meter, and obtaining angle and position information of the pointer; and obtaining a reading number value by utilizing the information of the pointer.

The invention discloses an optical fiber sensor combination for monitoring the corrosion of reinforced concrete. The optical fiber sensor combination comprises an optical fiber sensor and a compensation sensor, wherein the optical fiber sensor and the compensation sensor comprise reinforcing steel bar elements, reinforced fiber glass reinforced plastic support bases, optical fiber Bragg gratings and connecting optical fibers, protective sleeves, silicon sheets, reinforcing steel bar coating regions, reinforcing steel bar un-coating regions, and mortar housings, wherein the reinforcing steel bar elements of the optical fiber sensors are reinforcing steel bars to be tested, and the reinforcing steel bars of the compensation sensor are 316L stainless steel bars. According to the optical fiber sensor combination, a reaction force of mortar is counteracted to a certain extent, the local corrosion of the reinforcing steel bars is favorably monitored, and the sensitivity of monitoring is improved. The compensation sensor is made by adopting a manner of replacing common reinforcing steel bars by 316L stainless steel, and is simple in principle and convenient to operate. The optical fiber sensor combination is simple in structure, convenient to manufacture, low in cost, good in sensitivity, high in accuracy, strong in anti-electromagnetic interference, high in reliability, good in durability, and high in stability, and is suitable for monitoring the long-term durability of reinforcing steel concrete structures such as saline and alkaline land, seawater and deicing salt under multiple environments.

The invention discloses a novel pulse metering device in a fuel gas meter end and a metering method, and relates to the technical field of fuel gas metering devices. The novel pulse metering device in the fuel gas meter end mainly comprises a photoelectric sensor, an MCU, a counting gear and a transmission gear. The photoelectric sensor comprises a photoelectric transmitting tube and a photoelectric receiving tube, the photoelectric sensor is used as a metering switch, and the MCU is used for conducting on-off control and signal processing. According to the scheme, reflecting mediums are added to the counting gear and are used as on-off mediums of the photoelectric sensor, when the photoelectric sensor identifies a white medium, the photoelectric sensor outputs a voltage to the MCU, when the photoelectric sensor identifies a black medium, the photoelectric sensor outputs another voltage to the MCU, and then the MCU achieves a metering function by distinguishing signals of different voltages. According to the novel pulse metering device in the fuel gas meter end and the metering method, the novel metering device has the advantages of being accurate in metering, strong in anti-light capability, low in power dissipation and cost, simple in process, high in production efficiency, and strong in anti-interference capability.

The invention relates to a fiber grating force-measuring anchor rod device. The fiber grating force-measuring anchor rod device comprises an optical fiber, a rod beam and a hollow anchor rod, wherein at least one grating is arranged on the optical fiber, gratings are adhered onto the rod beam, the rod beam penetrates through the hollow anchor rod, a limiting block is arranged at one end of the rod beam and is clamped on one side of the hollow anchor rod, a fastening nut and an end nut are in threaded connection with the rod beam, the hollow anchor rod is connected with an optical fiber base through welding, the optical fiber base is in threaded connection with an optical fiber base cover, the optical fiber base cover is provided with an optical fiber connection flange and is in threaded connection with a protective cover, and an optical fiber outlet is arranged on the protective cover. According to the fiber grating force-measuring anchor rod device, deformation data of the anchor rod device are collected through fiber gratings, and the optical fiber has the advantages of being good in lightning stroke resistance, high in anti-electromagnetic interference capability and capable of achieving remote measurement, so that the reliability and the measurement precision of the fiber grating force-measuring anchor rod device are improved, and the data transmission distance of the fiber grating force-measuring anchor rod device is increased.

The invention relates to an instrument for measuring explosive velocities. The instrument comprises a plurality of probes with photosensitive diodes and a crystal oscillation timer with an LED display screen. Each probe with the photosensitive diode comprises the photosensitive diode and a probe circuit, one end of each probe circuit is connected with the corresponding photosensitive diode by an enameled wire, the multiple probes with the photosensitive probes are sequentially fixed to the surface of an explosive column along the axial direction of the explosive column, a photosensitive surface of each photosensitive diode clings to the surface of the explosive column, light-tight black insulating rubber tapes completely wrap the photosensitive diodes on the surface of the explosive column, a plurality of acquisition interfaces are arranged on the crystal oscillation timer and are respectively connected with leg wires of the enameled wires by cables, and the leg wire of each enameled wire is arranged at the other end of the corresponding probe circuit. The instrument has the advantages that change of the density and mechanical packaging states of the explosive column can be prevented, the instrument is high in electromagnetic interference resistance and convenient to mount and can be used for measuring the explosive velocities when explosive explodes in underwater environments, and the adhesion positions of the instrument can be flexibly changed.

The invention provides a miniature optical fiber sensing system capable of monitoring the brain pressure and the brain temperature simultaneously. An optical fiber sensor is placed in the brain. The optical sensor is connected with one end of an optical fiber connector and the other end of the optical fiber connector is connected with one end of a 1*3 coupler. The other two ends of the coupler are connected with the input ends of two photoelectric detectors respectively. The fourth end of the coupler is connected with a white light source. The output ends of the two photoelectric detectors are connected with the input end of a pressure signal extraction module and a temperature signal extraction module respectively. The output end of the pressure signal extraction module is connected with the input end of a pressure signal amplification module. The temperature signal extraction module is connected with the input end of a temperature signal amplification module. The output end of the pressure signal amplification module and the output end of the temperature signal amplification module are simultaneously connected with the input end of a pressure and temperature signal analysis module. The output end of the pressure and temperature signal analysis module is connected with a display module. By the adoption of the miniature optical fiber sensing system capable of monitoring the brain pressure and the brain temperature simultaneously, the brain pressure and the brain temperature can be simultaneously monitored dynamically and accurately.

The invention discloses a serial multi-shaft step control method and system used in solder paste printing machine. The invention cooperative controls plural key moving shafts for solder paste printing by plural working conditions of the solder paste printing machine such as initialization, waiting, automatic print, quit, configuration and so on. A DC 4-axis step servo driver in the system drives X-axis stepper motor and scraper Z1-axis stepper motor and scraper Z2-axis stepper motor of camera; a DC 4-axis step servo driver drives platform Y1-axis stepper motor, platform Y2-axis stepper motor, platform X-axis stepper motor and wide rail axis stepper motor; An AC single axis step servo driver drives camera Y-axis stepper motor. The invention can effectively improve cooperative control capacity and alignment accuracy for PCB solder paste printing machine, has less wiring, and high resistance to electromagnetic interference, compact structure and abounding control functions, and is applicable for various PCB solder paste printing machine.

The invention discloses a short-range wireless information transmission method and a mobile terminal, and relates to the technical field of wireless communication. The problem that the data rate, confidentiality and the effective communication distance cannot be all considered in the prior art is solved. The method comprises the following steps: a present side mobile terminal converts to-be-sent data into a digital signal and a modulating signal through a processor and a modem in sequence, and then a laser generates a laser signal according to the modulating signal and emits the laser signal; an opposite side mobile terminal receives the laser signal through an optical receiving antenna, a photoelectric converter converts the laser signal into an electric signal, the modem demodulates the electric signal, and finally the processor restores the data sent by the present side mobile terminal according to a demodulating signal. The method disclosed by the invention is applied to the mobile terminal.

The invention provides a high-energy capacitive energy storage plasma igniter digital electric detonator and belongs to the technical field of initiating-explosive-free high-energy capacitive energy storage plasma igniter digital electric detonators. The high-energy capacitive energy storage plasma igniter digital electric detonator aims to achieve structural improvement. According to the technical scheme, the high-energy capacitive energy storage plasma igniter digital electric detonator comprises a detonator composed of an explosive containing pipe and a control pipe, wherein one end of theexplosive containing pipe is sealed, the other end of the explosive containing pipe and one end of the control pipe are connected into a whole through a clamping waist a, and the other end of the control pipe is provided with a clamping waist b. The explosive containing pipe is sequentially provided with main high explosive, auxiliary high explosive and motivating high explosive from the sealed end to the outside, the motivating high explosive is contained in a reinforcing sleeve, a plasma igniter is arranged outside the reinforcing sleeve, the extraction electrode wires are welded to positiveand negative electrode bonding pads of the plasma igniter, a first seal plug fills the inside the clamping waist a, and the electrode wires penetrate through the first seal plug to be connected intoa control circuit board arranged inside the control pipe. The high-energy capacitive energy storage plasma igniter digital electric detonator is applied to electric detonators.

The invention discloses a tunnel surrounding rock deformation monitoring method and monitoring system. The system comprises an automatic data acquisition system, a wireless remote transmission system,a computer cloud, an engineering project management center, a warning device and a post-processing system; the automatic data acquisition system comprises a sensor, a data acquisition device and a short-range wireless transmission and receiving device; the computer cloud includes a base station, a remote wireless transportation device and a server; the engineering project management center includes a data analysis processing system, a management center, a report center, and other processing systems; the computer cloud and the engineering project management center share data with each other; and after receiving warning information, the warning device issues an early warning of a corresponding level, and determines whether to send preventive measure information to the post-processing systemaccording to the warning level. With the tunnel surrounding rock deformation monitoring method and monitoring system of the invention adopted, all-weather, real-time continuous monitoring and early warning of the surrounding rock of a tunnel can be realized, the lives of construction workers can be prevented from being exposed to dangers, damage to mechanical equipment can be reduced, and accidents caused by the large deformation of the surrounding rock can be prevented advance.

The invention provides an atmospheric pressure meter based on a fiber bragg grating, which comprises a vacuum membrane box, a fiber bragg grating, a tunable matching grating filter, a wideband light source, a light isolator, a Y-type fiber coupler, a photoelectric detector and a signal amplifying and processing system, wherein the fiber bragg grating is fastened on the surface of the vacuum membrane box through glue. In the invention, the information of wavelength drift is demodulated by using a matching grating demodulating method, therefore, the strain of the fiber bragg grating, namely the deformation degree of the vacuum membrane box, is solved, and finally, the atmospheric pressure value is obtained. Light wavelength is detected but the light power is not detected, and light wavelength information is not influenced by light power loss in a light transmission process, therefore, the atmospheric pressure meter has the advantages of higher detection precision, larger resolving property and smaller noise. The atmospheric pressure meter is high in sensitivity and strong in strain resolving property. Meanwhile, an optical fiber sensor has stronger capacities of resisting electromagnetic interference, vibration, dampness, corrosion and the like, so that the atmospheric pressure meter can be normally used in a serious environment for a long time.

The invention relates to the technical field of unmanned ships and provides an emergent rescuing method and a system for an unmanned ship with electromagnetic interference. The method comprises the following steps: after confirming that a communication signal of a target unmanned ship is lost, an emergent unmanned ship sails to an area of position information reported by the target unmanned ship for the last time; a dragging antenna is released, and a communication channel with a shore base is established through the dragging antenna; a laser detection signal is transmitted in a broadcast mode to the area with the position information reported by the target unmanned ship for the last time; after a laser response signal fed back from the target unmanned ship is received, current state information of the target unmanned ship is fed back through the communication channel between the dragging antenna and the shore base. By virtue of the properties that the laser detection signal is high in directivity and good in electromagnetic interference resistance, the emergent unmanned ship is adopted as a node, and a communication channel which comprises multiple types of communication signals and is capable of preventing electromagnetic interference is established. The purpose that the target unmanned ship can still receive and transmit instructions in an electromagnetic interference environment is achieved.

The invention relates to an oil-powered multi-rotor unmanned aerial vehicle autopilot, which comprises a main processor, a coprocessor, a gyroscope, a barometer, an accelerometer and a compass, wherein the main processor, the coprocessor, the gyroscope, the barometer, the accelerometer and the compass are packaged on a motherboard; the motherboard is externally provided with multi-path control interfaces including a power input interface, a receiver, a steering engine control interface, a data transmission interface and a GPS interface; the gyroscope, the barometer, the accelerometer and the compass are all connected to the main processor; the power input interface is used for connecting an external power supply; and a BEC is used for supplying power and acquiring electric quantity. The oil-powered multi-rotor unmanned aerial vehicle autopilot is an industrial full-function flight control and navigation system specially developed for an oil-powered multi-rotor unmanned aerial vehicle, adopts a self-adaptive flight control and navigation algorithm, has good fault-tolerance performance, integrates a high-precision MEMS inertial sensor and the high-performance central processor, supports full-automatic takeoff and landing and automatic airline operation, is high in anti-electromagnetic interference and anti-vibration capability, and is high in reliability.

The invention relates to a device for monitoring lateral displacement of soil in situ and a using method of the device, and belongs to the field of geotechnical engineering. The device for monitoringthe lateral displacement of soil in situ comprises a static penetration machine, a sleeve, a steel strip adhered with a fiber grating and a probe, wherein the probe is pressed and contacted at the bottom end of the sleeve, the probe is fixedly connected with the steel belt, and the static penetration machine drives the sleeve to move into a soil body through a built-in driving part, so as to enable the probe and the steel belt to be pressed into the soil to a predetermined depth; the sleeve is pulled out by the static penetration machine, the steel belt adhered with the fiber grating remainingin the soil body deforms together with the soil body, and the fiber grating measures and outputs the deformation amount, so that the purpose of monitoring the lateral displacement of the soil body isrealized. The fiber grating in the device has small volume, plastic geometric shape and strong electromagnetic interference resistance; with the deformation of soil, the steel strip can be automatically monitored in real time and warned in time; the static penetration machine does not need pre-drilling, the equipment is simple and the operation is convenient; and meanwhile, the device has the advantages that the precision is high and manual measurement errors can be avoided.

The invention discloses a preparation method of a brush for an electric tool motor, relating to the field of materials. The method comprises the steps of: mixing base powder comprising an aqueous solution of graphene with a pitch binder uniformly under the heating condition to obtain a brush raw material mixture; crushing, screening and mixing the brush raw material mixture to obtain brush raw material mixture powder; adding the brush raw material mixture powder into a pressing mold and pressing to obtain a brush blank; roasting the brush blank to obtain an initial brush product; and processing the initial brush product to obtain a finished brush product. The brush for the electric tool has moderate resistivity, low brush running spark grade, good commutation performance, good product stability, excellent abrasion resistance and electromagnetic interference resistance, and is especially suitable for medium and low power angle grinder motors.

The invention discloses a D-shaped wound type polymer optical fiber corrosion sensor as well as a preparation method and application thereof. The D-shaped wound type polymer optical fiber corrosion sensor comprises a D-shaped polymer optical fiber, wherein the D-shaped polymer optical fiber is arranged on the surface of a steel bar element; pull stress of the D-shaped polymer optical fiber is concentrated along with corrosion of the steel bar element; a corrosion state of the steel bar element is determined according to a change of a D-shaped cross section of the D-shaped polymer optical fiber. The steel bar element made of a same material as engineering steel is closer to an actual situation. The sensor is high in sensitivity, high in accuracy and high in electromagnetic interference resistance, can realize lossless, quantitative and online monitoring of steel bars in concrete, and provides conditions for finding corrosion early and taking measures immediately.