47results about How to "Not susceptible to electromagnetic interference" patented technology

The invention relates to a satellite navigation receiver FPGA (Field Programmable Gate Array) rapid loading method. According to the method, a multifutional buffer serial port of a DSP (Digital Signal Processor) chip is adopted as a special clock data line special for an FPGA during loading by virtue of a special use metod; the DXm of the multifunctional buffer serial port is used as a data line to be connected with an FPGA loading data input end DATA0; the CLKXm of the multifunctional buffer serial port is used as a clock line to be connected with an FPGA loading data input end DCLK; and the GPIO (General Purpose Input/Output) pin of the DSP is used as a loading functional line to be connected with three special deployment pins of the FPGA. According to the method, the DSP chip, a FLASH chip, an RS232 level conversion chip, resisters R1, R2 and R3, and the FPGA are firstly connected, then FPGA loading is performed, and remote upgrading is performed on a FLASH program according to needs; and the method has the advantages of short loading time, easiness for external program upgrading, large storage capacity, rapid loading speed, less possibility of electromagnetic interference and strong universality.

The invention discloses a pipeline leakage monitoring system which comprises a front end sensor subsystem and a leakage monitoring signal conditioning subsystem with a current loop receiving module, a signal restore module, a second lower-frequency amplification module and a second lowpass filter module. The front end sensor subsystem is used for amplifying and filtering dynamic pressure signals generated due to dynamic pressure changes at the leakage moment of a pipeline and then converting the dynamic pressure signals into current signals, the current signals are transmitted to the leakage monitoring signal conditioning subsystem, the leakage monitoring signal conditioning subsystem converts the received current signals into dynamic pressure signals, and then amplifies and filters the dynamic pressure signals, and then the dynamic pressure data of the pipeline leakage are recorded. The invention further discloses a pipeline leakage monitoring method. According to the pipeline leakage monitoring system and method, a sensing system is high in sensitivity, capable of responding to tiny signals, high in signal to noise ratio, compact in structure, long in service life, safe and reliable, and cannot be interfered by electromagnetism easily.

The invention relates to the technical fields of white light interference measurement and gas photoacoustic spectrometry measurement, in particular to a photoacoustic spectrometry measuring device and method based on low-coherence optical fiber differential interference non-contact vibration measurement. The device comprises an ASE light source, a first circulator, a second circulator, a first coupler, a second coupler, a third coupler, a delay optical fiber, a first optical fiber connector, a second optical fiber connector, a ceramic bushing, a high-sensitivity pressure sensitive membrane, a fiber bragg grating with a PZT modulator, a first photoelectric detector, a second photoelectric detector, a third photoelectric detector, a data collecting unit and a computer. The low-coherence light source is adopted, the detection light path is of a Mach-Zehnder and Sagnac mixed interferometer structure, and the three detectors are used for conducting three-way detection modulation on return light. The photoacoustic spectrometry measuring device has the advantages that the device is insensitive to low-frequency disturbance, the measurement dynamic range is large, long-distance non-contact absolute amplitude measurement of optical fiber white light interference can be achieved, light pressure vibration interference is small, and the photoacoustic spectrometry measuring device is not prone to suffer from electromagnetic interference.

The present invention relates to one kind of six-freedom visual tracking method and system based on microcomputerized parallel processing structure. The tracking process includes the following operation steps: 1) installing artificial marker onto the tracked target, 2) performing view field acquisition of the scene with the artificial marker with several video cameras to obtain the original image, 3) processing the obtained image in computer, and 4) completing the 3D reconstruction of the spatial position and direction of the artificial marker and outputting the reconstructed result via network communication equipment to various man-computer interaction system. The tracking system includes N microcomputers, N image acquiring systems, N network communication cards and one network exchanger. The method and system of the present invention can realize the precise location and tracking of spatial target and has less influence of electromagnetic interference and other advantages.

The invention relates to a method for identifying the surface contamination condition of a DC line insulator based on a visible light image. The method comprises the steps of preprocessing an image by adopting the visible light image segmentation algorithm, establishing the relationship between the contamination level and the visible light image, and identifying the contamination condition. According to the embodiment of the invention, the method comprises the steps of acquiring the visible light image of an insulator; preprocessing the image: including segmenting the image, removing the complex background of the image, filtering out the interference information, and ensuring the accuracy of the subsequent feature extraction and the contamination identification. The method specifically comprises the steps of converting an RGB model into an HSV color model; extracting the image color statistic features of the insulator, and evaluating the superiority-inferiority of each statistic feature according to a Fisher criterion function; forming characteristic vectors by adopting statistic features in accordance with requirements and inputting the characteristic vectors into an SVM classifier for classification; and outputting a contamination level. The method is suitable for all insulators having obvious differences from contamination color features. Therefore, the contamination levels of insulators can be effectively identified and the classification accuracy is high. The method provides a new technical means for the identification of the contamination condition.

The invention relates to an optical current sensor and a high-frequency signal measurement system. The optical current sensor comprises an optical sensing part, a polarization maintaining fiber, an insulator and a demodulation module. The optical sensing part, the polarization maintaining fiber and the demodulation module are connected in sequence. The optical sensing part is supported by the insulator. The polarization maintaining fiber locates in an inner cavity of the insulator. The optical sensing part comprises a first sensing fiber ring, a second sensing fiber ring, a first wave plate, a first reflector, a second wave plate, a second reflector and a support, wherein the first wave plate, the first reflector, the second wave plate, the second reflector and the support are all made of nonmetal material. The first sensing fiber ring and the second sensing fiber ring are opposite in current direction. The demodulation module outputs two linearly-polarized beams passing the polarization maintaining fiber and the optical sensing part, the linearly-polarized beams carrying measured current information are returned and received by the polarization maintaining fiber, the beams are operated on the basis of differential induction, and measured current is obtained. The optical current sensor is capable of measuring high-frequency signals, and measurement is higher in accuracy and reliability.

The invention discloses a battery monitoring method and system. The battery monitoring method comprises the following steps of obtaining an energy change curve of a battery, wherein the energy changecurve represents an energy change of the battery during charging or discharging under an ideal state, each energy value of the energy change curve corresponds to one temperature difference value of the battery, and a fiber bragg grating temperature sensor is arranged on the battery; acquiring temperature values of the battery during the charging or discharging through the fiber bragg grating temperature sensor, and calculating a first temperature difference value between two temperature values of the battery in a preset time period; obtaining first electric energy, charged or discharged in thepreset time period, of the battery; and obtaining a first energy value corresponding to the first temperature difference value from the energy change curve, judging whether an absolute value of a difference value between the first energy value and the first electric energy is greater than or equal to a first preset threshold value or not, and if the absolute value of the difference value is greater than or equal to the first preset threshold value, ending power supply of the battery and outputting alarm information. The method and system are capable of improving the correctness of battery monitoring data and improving the safety of batteries during the work.

The invention discloses an all-attitude calculation method for a holder, and the method comprises the following steps: respectively mounting a first accelerometer and a second accelerometer in the axial direction and the transverse direction of the holder, mounting a single-axis optical fiber gyroscope on a reference plane parallel to the mounting surface of the first accelerometer in the axial direction, and mounting a coded disc in the longitudinal direction of the holder; calculating a tracking pitch angle and a roll angle in real time by using a ratio of an output acceleration mean value to a gravitational acceleration of the first accelerometer and the second accelerometer in a time period, and leveling the holder; rotating the single-axis optical fiber gyroscope to four positions atan interval of 90 degrees by using an indexing mechanism of a cradle head, respectively acquiring gyroscope data of the four positions, and calculating an initial azimuth angle according to an azimuthangle model calculated by the four positions; after the initial azimuth angle is obtained, obtaining the real azimuth angle of the holder according to the coded disc azimuth tracking model by utilizing the angle change value of the coded disc relative to the initial azimuth angle. According to the invention, the pitch angle, roll angle and azimuth angle of the holder can be calculated autonomously in real time.

The invention belongs to the technical field of photoelectric detection and relates to a wind speed measuring device and method based on surface plasma resonance. The device includes a broad spectrumlight source, a heating light source, a fiber sensor, a spectrometer, a coupler, an isolator B, an isolator C, a circulator, a single mode fiber and a wind speed measuring pipeline, wherein the fibersensor is a fiber temperature sensor based on surface plasma resonance and strain compensation, a sensing fiber is formed through respectively plating metal films generating surface plasma resonance at inner walls of two dielectric holes at the center of opposite sides of a second hexagonal dielectric hole layer outwards, a medium hole plated with the metal film and two adjacent medium holes on the same layer are filled with a medium A, a media B is filled in all the media holes which are not filled with the media A, when the temperature of the fiber sensor changes, resonance wavelength changeof the metal films A and B is not consistent, a strain value is solved, the strain effect is eliminated, a temperature value is solved, and the fiber hotline wind speed is calculated on the basis.

The invention discloses a sea cable insulation fault monitoring method based on a temperature field of a photoelectric hybrid submarine cable. The method comprises the steps of calculating heat generation rate parameters of an armor layer and a metal shielding layer 6 according to the current-carrying capacity of the submarine cable, establishing a submarine cable temperature field model based ona thermoelectric coupling module, calculating a temperature field of the submarine cable in operation, calculating a dielectric loss factor tan delta, and evaluating the insulation status of the submarine cable. According to the method, the insulation status of the submarine cable can be effectively monitored, the monitoring is not susceptible to the influence of electromagnetic interference, through establishing a physical model, a numerical calculation method is used to solve the temperature field, the determination of a correction coefficient is not needed, the heat generation rates of thearmor layer and the metal shielding layer 6 are calculated based on an iterative method, the accuracy of a modeling calculation result is high, and the accuracy of subsequent temperature field calculation is ensured while the amount of calculation is reduced.

The invention discloses a U-shaped biconical optical fiber biological film sensor, and a manufacturing method and a measuring method thereof. The U-shaped biconical optical fiber biological film sensor comprises a measurement sensing arm and a reference sensing arm, wherein the measurement sensing arm and the reference sensing arm are multimode optical fibers. The U-shaped biconical optical fiber biological film sensor is characterized in that: measuring regions of the measurement sensing arm and the reference sensing arm are each set to be U-shaped, and each of left and right arms of each U-shaped optical fiber has a taper with a large upper part and a small lower part; tail ends of the measurement sensing arm and the reference sensing arm are each set to be hemispheric-shaped, and the surface of each hemispheric-shaped optical fiber cladding is painted with a metal film; and the optical fiber surface of the measuring region of the reference sensing arm is painted with a polyimide-silica hybrid filtering film. According to the U-shaped biconical optical fiber biological film sensor, the manufacturing method thereof and the measuring method thereof, a double-probe sensor is adopted, the measurement sensing arm and the reference sensing arm are used for detecting a biological film simultaneously, and the online accurate measurement of the whole process of growth of the biological film is realized; and the measuring regions of the measurement sensing arm and the reference sensing arm each adopts a U-shaped double-cone structure, the U-shaped biconical optical fiber biological film sensor has good application prospect, and can be widely used in fields such as biology, chemical engineering and environmental protection.

The invention discloses finite element simulation-based submarine umbilical cable temperature field analysis, and relates to the technical field of umbilical cable temperature field simulation. The method comprises the following steps of: 1, establishing a submarine umbilical cable geometric model in ANSYS simulation software; 2, inputting the composition material parameters of each part of the submarine umbilical cable into ANSYS simulation software, establishing a submarine umbilical cable finite element model, and performing mesh generation; 3, setting a water area around the submarine umbilical cable; 4, setting the value ranges of the ambient temperature, the working current and the convective heat transfer coefficient of the umbilical cable; 5, modeling and simulating the steady-state temperature field of the umbilical cable; 6, modeling and simulating a local heating steady-state temperature field of the umbilical cable; and step 7, modeling and simulating the transient temperature field of the umbilical cable. According to the invention, the submarine umbilical cable temperature field under complex structure and environmental conditions can be accurately calculated, and thenonlinear mapping relationship between each layer of the umbilical cable and the optical fiber temperature can be simply and conveniently obtained.

The invention discloses a plastic scintillation optical fiber dosemeter based on SiPM leakage current readout. The plastic scintillation optical fiber dosemeter based on the SiPM leakage current readout comprises a shell in which a dark room is formed; a PCB board arranged in the dark room, wherein a readout circuit and a SiPM are arranged on the PCB board, the readout circuit comprises a circuitinput end and a current-limiting resistor, the circuit input end, the current-limiting resistor and the SiPM are serially connected, and the circuit input end is connected with a power supply; an ampere meter arranged at the external of the shell, wherein the input end of the ampere meter is connected with the SiPM, and an output end of the ampere meter is grounded; a plastic scintillation opticalfiber for interacting with the ray to produce visible light; a transmission optical fiber with one end connected with the plastic scintillation optical fiber and the other end penetrating through theshell to connect with the SiPM in the dark room, wherein the transmission optical fiber is used for transmitting visible light. The SiPM is used as the photoelectric conversion element, the SiPM hasthe advantages of being small in volume and hard to be interfered by the electromagnetism; and the usage range of the plastic scintillation optical fiber dosemeter is enlarged. The actual radiation dosage can be obtained by reading the SiPM leakage current to compare with a dosage response curve calibrated by a laboratory.

The present invention provides a test system for obtaining the position of a moving body. The test system comprises at least one set of a sensitive body arranged on a moving body to be measured, a position sensing unit, a photoelectric unit, a position signal transmission optical cable and a position data processing unit; the position data processing unit includes a box body and three sensors of the same type, wherein the three sensors are arranged at certain intervals so as to form a structure shaped like a Chinese character "pin"; the sensors are arranged in the box body; the box body is fixed at a position which is separated from the sensitive body by a detection distance; the photoelectric unit is arranged in the box body and is used for performing photoelectric isolation and level conversion on electric signals which reflect the position of the moving body and are outputted by the position sensing unit so as to obtain optical signals which can be remotely transmitted by the optical cable and reflect the position of the moving body; the position signal transmission optical cable is used for transmitting the optical signals to the position data processing unit; and the position data processing unit is used for obtaining the position of the moving body to be measured according to the optical signals. According to the test system of the invention, the optical cable is adopted as a signal transmission medium, can remotely transmit signals and has strong anti-electromagnetic interference capacity.

The invention relates to an optical measuring system used for measuring field intensity of a direct-current electric field and belongs to the technical field of direct-current electric field measuring. In the optical measuring system, an output end of a laser source is connected with an input end of an integrated electric field sensor based on common path interference through an input polarization maintaining optical fiber, and optical signals modulated through the electric field are photoelectrically converted by an optical fiber transmission-in detector; an air source after entering an electromagnetic reversing valve gates airflow of two air ways and is input into a rotating device to drive a drum to rotate bidirectionally; a driving circuit drives an electromagnetic valve to realize current conversion. The rotating device at the front end is made by a nonmetal material, so that distortion to a to-be-measured field is reduced; all devices in the optical measuring system are connected flexibly, so that flexibility in measuring mode is improved; a control circuit, the driving circuit and the optical measuring system are isolated fully, so that the optical measuring system is less prone to electromagnetic interference, and accuracy and reliability of measuring results are improved. By the optical measuring system, direct-current electric field distribution on the surface of an object can be measured nearly, so that range of electric fields which can be measured is expanded.

The invention provides a method and system for displaying and controlling inflation and deflation of a tire in real time. The method comprises the steps of S1, sensing the tire pressure; S2, regulating and controlling the tire in real time according to the tire pressure. The system comprises a wheel rim solenoid valve and a controller assembly ECU, and the wheel rim solenoid valve is configured tosense the tire pressure and regulate and control the tire in real time according to an operation instruction transmitted by the controller assembly ECU; the controller assembly ECU is configured to receive a signal of the tire pressure sensed by the wheel rim solenoid valve and transmit a signal of the operation instruction for regulating and controlling the tire to the wheel rim solenoid valve.According to the technical scheme, the method and system for displaying and controlling the inflation and deflation of the tire in real time can display and control the tire pressure of the tire in real time, and have the advantages that the system and method are not easily affected by electromagnetic interference, the signals are stable, a pipeline does not need to be under pressure for a long time, the versatility is high, a battery does not need to be installed, and the workload for later maintenance is small.