49results about How to "Not easy 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 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 discloses a great-angle tilted fiber bragg grating mechanical vibration sensing array and a great-angle tilted fiber bragg grating mechanical vibration sensing system. The great-angle tilted fiber bragg grating mechanical vibration sensing array comprises an optical fiber core, and is characterized in that: the front section of the optical fiber core is provided with a 45-degree tilted fiber bragg grating, and the 45-degree tilted fiber bragg grating serves as a polarizer of a great-angle tilted fiber bragg grating vibration sensor; an included angle between tilted grating stripes of the tilted fiber bragg grating and an optical fiber cross section is 45 degrees; the middle section of the optical fiber core is provided with N great-angle tilted fiber bragg gratings, and N is a natural number greater than or equal to 1; grating stripes of the N great-angle tilted fiber bragg gratings are parallel to one another, and an included angle between the tilted grating stripes of each great-angle tilted fiber bragg grating and the optical fiber cross section ranges from 79 to 84 degrees; and the outer surface of an optical fiber cladding corresponding to each great-angle tilted fiber bragg grating is provided with an elastic membrane. The great-angle tilted fiber bragg grating mechanical vibration sensing array and the great-angle tilted fiber bragg grating mechanical vibration sensing system can be widely used in the fields of optical fiber perimeter and structural safety monitoring, landslide early warning and the like.

A chemical and biological transducer is prepared by setting long period fibre grating, reflecting film on fibre section, fibre covering, fibre core and metal film on fibre covering surface on one piece of fibre to SPR transducer of fibre Michelson interferometer structure. The sensing system comprises wide band light source, fibre, chemical and biological transducer prepared as above, wide band coupler, fibre spectrograph and computer.

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 a roadbed settlement monitoring device based on a fiber Bragg grating. The roadbed settlement monitoring device based on the fiber Bragg grating comprises at least two fiber Bragg grating liquid level sensors mounted on a monitoring surface; each fiber Bragg grating liquid level sensor comprises a cylindrical shell, and the bottom of each shell is mounted on a base; a rectangular cantilever beam, a cylindrical floating block and antifreezing solution are arranged inside each shell; the upper side and the lower side of each rectangular cantilever beam are respectively embedded into a fiber Bragg grating sensor, each floating block is suspended in the corresponding antifreezing solution, and each floating block is hinged with the free end of the corresponding rectangular cantilever beam; and the fiber Bragg grating sensors are welded and in serial connection with an optical cable, the optical cable is connected with a fiber Bragg grating demodulation instrument, strains of the rectangular cantilever beams when liquid levels in the shells are changed are acquired by virtue of the fiber Bragg grating demoulation instrument, adjacent upper sections of the shellsof the fiber Bragg grating liquid level sensors are communicated via a breather pipe, adjacent lower sections of the shells of the fiber Bragg grating liquid level sensors are communicated via a liquid flowing-through pipe, so as to enable the rectangular cantilever beams to produce bending deformation, and the liquid flowing-through pipe is connected with an automatic liquid level controller.

The invention relates to an installation structure of an optical fiber sensor used for the contact temperature detection of a power switch cabinet, wherein an optical fiber sensing and fixing device is arranged on the sensor; a contact of a breaker is connected with an optical fiber with a sheath; the optical fiber with the sheath is connected with an optical fiber sensing temperature-measuring device; the optical fiber sensing temperature-measuring device is installed on a quincunx moving contact of the switch cabinet; a heat-shrinkable sleeve is arranged between an arm and an upright of the breaker; the upright of the breaker is connected with one endpoint of a terminal distributor; and the other endpoint of the terminal distributor is connected with an industrial optical fiber connector. The invention has the advantages that the installation structure is used for the optical fiber sensing temperature-measuring device, so that the installation structure has good explosion and lightning prevention and anti-electromagnetic interference capacity and can meet the insulation requirement of a power system; the installation structure has stable and reliable performance; the sensing unit has small volume and light weight; and the installation structure has the characteristics of corrosion resistance and high voltage resistance, can be used for transmitting signals in a passive way at a long distance and can be suitable for measuring the temperature in the power system and the petrochemical industry system. In addition, the installation structure can be used for monitoring the temperature of hundreds of points to be measured at real time.

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 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 invention belongs to the technical field of photoelectric detection, and presents an optical fiber temperature sensor based on surface plasmon resonance and strain compensation. A sensing fiber isa solid photonic crystal fiber. Dielectric holes of the photonic crystal fiber are distributed in a regular hexagonal shape and in multiple layers with the fiber core as the center. The inner walls of the two dielectric holes in the centers of the opposite sides of the second hexagonal dielectric hole layer from the fiber core are coated with metal films, and the metal films are made of a metal material capable of generating surface plasmon resonance. One of the dielectric holes coated with the metal films and two adjacent dielectric holes in the same layer are filled with a dielectric A, andthe refractive index of the dielectric A is negatively correlated with temperature. All the dielectric holes not filled with the dielectric A are filled with a dielectric B, and the refractive indexof the dielectric B is not affected by temperature. The problem that the accuracy of measurement results is affected by strain in temperature sensing is solved. The temperature sensor is corrosion-resistant and not susceptible to electromagnetic interference, and can be used in harsh detection environments.

The invention discloses a concentration ratio wireless control system, which is applied to the field of concentration ratio control. A wireless sensor unit is used for acquiring parameter data relative to the concentration radio. A wireless data acquisition unit collects data from the wireless sensor unit. A wireless control unit processes data transmitted from the wireless data acquisition unit, sends out feed-and-drain valve regulating commands according the processing results, and then transmits the regulating commands to the wireless control unit wirelessly. A wireless executing unit executes the feed-and-drain valve regulating commands to regulate water volume and keeps the concentration ratio at a proper value stably, so that safety in production is guaranteed while water resources are saved. Wireless transmission refers to data transmission based on the ZigBee wireless network, so that electromagnetic interference is avoided effectively, and error in data transmission process is decreased. In addition, the structure of the control system can be regulated at any time according to needs of the control system.