12results about How to "Anti-electromagnetic interference" patented technology

The utility model relates to the technical field of road monitoring, in particular to an expressway collapse real-time monitoring and early warning system based on distributed optical fibers, which comprises the distributed optical fibers laid on two sides of an area to be monitored of an expressway along the length direction; an optical fiber sensing monitor; and the optical fiber sensing monitor is connected to the distributed optical fiber and is used for transmitting an optical carrier signal to the distributed optical fiber. According to the utility model, on the basis of the distributed optical fiber sensors, monitoring and early warning are carried out on easy-to-collapse road sections of the expressway, once the road collapse is monitored, the collapse position can be positioned in real time, and the acousto-optic indication component in the corresponding area generates an alarm signal to warn drivers in the current road area, so that the driving safety of the expressway is improved. A certain time and space are reserved for effective danger avoiding of vehicles coming behind, and the probability of traffic accidents occurring in the neutral period before the site is blocked after collapse can be reduced.

This invention discloses a device for real-time analysis of multidimensional information of spatiotemporally mode-locked pulses using an all-fiber structure, belonging to the field of ultrafast optics technology. It includes an all-fiber spatiotemporally mode-locked laser platform, a raw pulse beam profile measurement module, an optical circulator, a sub-pulse beam profile measurement module, and a dispersive Fourier transform and real-time spectral information detection module. Based on the generalized multimode nonlinear Schrödinger equation, this invention constructs a theoretical model of the spatiotemporally mode-locked laser, explores the multidimensional parameter coupling mechanism during spatiotemporal mode-locking, clarifies the mapping relationship between modes and frequencies, and provides a theoretical basis and method for high-precision mode differentiation and multidimensional real-time information extraction. This invention aims to rationally design the parameters of each fiber grating according to the spectral width and temporal interval of the spatiotemporally mode-locked pulse, reflecting more sub-pulses while ensuring that the pulse temporal domains do not overlap, achieving high-precision spatial mode resolution, and maximizing pulse broadening to obtain high-resolution real-time spectral information.

This invention relates to the field of material corrosion testing and monitoring technology, and provides an acoustic emission-electrochemical monitoring device and experimental method for tank bottom plate corrosion. The device includes a sealed chamber, a partition, a working electrode, an auxiliary electrode, a reference electrode, an electrochemical workstation, and an acoustic emission sensing system. The partition is vertically arranged within the sealed chamber, dividing it into an anode chamber and a cathode chamber, and micropores are formed in the partition. The working electrode is the metal sample to be tested, with its working surface exposed to the corrosive medium, while the non-working surface and edges are covered by a sealing layer, which is an acrylic paint coating. A fiber optic grating acoustic emission sensor is coupled to the uncoated area on the same side of the working surface of the metal sample. This invention achieves high signal-to-noise ratio acquisition of anodic corrosion signals through a microporous partition, a fiber optic grating acoustic emission sensor, and a thin acrylic paint coating, providing a reliable experimental tool for in-depth research on the acoustic emission mechanism of pitting corrosion at various stages of tank bottom plates.

The application discloses a two-dimensional laser scanning galvanometer device based on piezoelectric bimorph driving, belongs to the technical field of piezoelectric driving scanning galvanometer, and comprises a base, a circular hole is formed in the side wall of the base, a part of laser emitting devices penetrating into the base is installed at the circular hole, a first deflection lens group is installed on the side of the base, a second deflection lens group which is fixed on the base and is arranged perpendicularly to the first deflection lens group is installed below the first deflection lens group, and an upper cover plate is installed on the top of the base. The two-dimensional laser scanning galvanometer device based on piezoelectric bimorph driving solves the problems of dynamic performance contradiction, thermal drift and reliability limitation of the existing electromagnetic driving scanning galvanometer, fundamentally realizes high bandwidth, low heat consumption, wear-free precision beam scanning, has the characteristics of small and exquisite, convenient to carry and low cost, and is suitable for mass production and popular application.

The utility model relates to the technical field of superconducting magnets, in particular to a shielding coil structure of a superconducting magnet, which comprises a coil groove and a shielding coil arranged in the coil groove. The shielding coil comprises a wire inlet section and a wire return section; the wire return section of the shielding coil is located on the outer side of the shielding coil. A wire return protection layer is arranged on the outer side of the shielding coil corresponding to the wire inlet and outlet, a wire return groove is formed in the wire return protection layer, and the wire return section is located in the wire return groove; and the loop protection layer is a flexible layer. A glass wool cloth belt layer, a copper belt layer and a stainless steel wire layer are arranged on the outer side of the shielding coil; the loop protection layer is located on the inner side of the glass wool cloth tape layer. According to the shielding coil structure of the superconducting magnet, the loop wire protection layer is arranged at the loop wire section of the shielding coil, loop wire distortion of the loop wire section of the shielding coil in the test or operation process of the superconducting magnet can be prevented, the loop wire section is effectively protected, the stability and reliability of the superconducting magnet are ensured, and the structure is simple and practical.

The invention discloses a method for diagnosing the encapsulation state of a dry-type air-core reactor, and belongs to the technical field of reactor fault diagnosis. The problems that an existing fault diagnosis method of the dry-type air-core reactor is large in noise interference and fault types cannot be distinguished are solved. Comprising the steps of sequentially applying sine excitation signals corresponding to frequency points to a reactor to be diagnosed according to a frequency point sequence, and collecting voltage signals at the two ends of the reactor and current signals flowing through the reactor; an actual full-band complex impedance spectrum is obtained; calculating a reactor resonance frequency deviation rate and a reactor resonance peak deviation; the impedance spectrum logarithmic error absolute sum, the impedance spectrum Euclidean distance, the impedance spectrum Chebyshev distance and the impedance spectrum cosine similarity are calculated; and constructing a fault diagnosis model based on a support vector machine algorithm, and obtaining a fault diagnosis result according to the obtained data. The method is used for fault diagnosis of the reactor.

The invention discloses a prestressed roof truss beam tensioning method which comprises the following steps: S1, prefabricating a component: binding a steel reinforcement framework, mounting an embedded part, setting a reserved hole channel, and pouring and maintaining concrete in sequence to form a roof truss beam concrete component with the reserved hole channel; the prestressed steel strand is penetrated into the reserved hole channel, the prestressed steel strand is an intelligent sensing steel strand, the structure of the prestressed steel strand is that an optical fiber rope is replaced or merged into the center wire position or the stranded rope core of the prestressed steel strand, at least a plurality of optical fiber sensors are packaged in the optical fiber rope, and the optical fiber sensors are arranged in the optical fiber rope; and a plurality of steel wires are uniformly arranged outside the optical fiber rope or the central wire. According to the method, the tensioning quality is improved from'result verification 'to'process controllability and result knowing', the controllability and precision of the tensioning process are achieved, the problem that prestress application is unqualified due to unsmooth hole channels, equipment errors and the like is solved, and it is guaranteed that the initial state of the structure is healthy.

The full-localization video decoding board comprises a processor adopting a domestic chip, an FPGA (Field Programmable Gate Array), a storage unit, an interface unit and a power supply system, the interface unit comprises a first connector and a second connector; a serial port of the processor is connected to the first connector through the serial port conversion chip; the output end of the processor is connected with the receiving end of the FPGA; the FPGA is connected to the second connector through the first conversion chip and the second conversion chip in sequence; the first conversion chip is used for converting an RGB signal output by the FPGA into a VGA single-ended signal and accessing the VGA single-ended signal to the second conversion chip; the second conversion chip is used for converting the VGA single-ended signal into an XGA signal and outputting the XGA signal to the second connector; the FPGA is further connected to the second connector through a third conversion chip, and the third conversion chip is used for converting RGB signals output by the FPGA into VGA single-end signals and outputting the VGA single-end signals to the second connector. The utility model has the advantages of simple circuit structure, low cost, strong compatibility, high transmission stability and the like.

This invention belongs to the field of communication wiring harness technology, and specifically to a novel high-strength communication wiring harness for automobiles. A rubber ring is slidably connected to the inner wall of the terminal head, and a protective component is fixedly connected to the surface of the rubber ring. The internal wiring of the terminal head is connected to a wiring harness assembly, which includes a spring wire. The protective component includes a connecting block. This invention utilizes silicone filling in the inner layer of the rubber ring to absorb vibration energy, reducing fatigue damage to the wiring harness caused by vibration. A braided mesh is used in the middle layer of the rubber ring to enhance the shielding effect against high-frequency electromagnetic fields. An outermost layer of metallized fabric further enhances the overall shielding performance. The rubber ring slides along the inner wall of the terminal head to transmit external impact forces. The connecting block compresses the connecting spring, and the spring's rebound is buffered by the friction between the rubber ring and the inner wall of the terminal head, ensuring the stability of the connection between the cable and the internal wiring of the terminal head.

The invention discloses a fiber bragg grating ice force sensor integrated with a simply supported beam structure and a force measuring method thereof. The fiber bragg grating ice force sensor comprises a beam body, a fixed support and an optical fiber, the two ends of the beam body are installed on the fixed supports to form a simply supported beam structure. One surface, directly bearing an ice force load, of the part, located between the fixed supports, of the beam body is a stress surface, and the other surface opposite to the stress surface is an optical fiber mounting surface; and the optical fiber is mounted on the optical fiber mounting surface of the beam body. When the stressed plate is subjected to ice force, displacement and strain are generated, the beam body is driven to be bent and deformed in a simply supported beam mode, the optical fiber connecting piece fixed to the beam body generates tiny displacement accordingly, the fiber bragg grating in the optical fiber connected with the optical fiber connecting piece generates axial strain, and therefore the Bragg wavelength of the fiber bragg grating drifts; and the size and direction of the ice force can be obtained through inversion by monitoring wavelength change. According to the invention, the metal beam body and the fiber grating sensing element are highly integrated, the structure is compact, the weight is light, and installation and arrangement on a laboratory ice force experiment model are facilitated.

This application relates to an optical receiver and an optical signal transmission device. The optical receiver includes: a circuit board, at least one optical module receiver, and a multi-channel optical input component. The optical module receiver includes a metal structural component, an optical receiving component, and a photoelectric conversion component. The metal structural component is fixed to one side of the circuit board and forms a closed space with a portion of the circuit board. The photoelectric conversion component is disposed within the closed space on the circuit board. The optical receiving component is disposed on the surface of the metal structural component facing away from the circuit board. Both the metal structural component and the circuit board are grounded. The optical input component is connected to the optical module receiver via an optical fiber. Because the embodiments of this application can form a "Faraday cage," the receiving performance of the optical module receiver can be improved. Therefore, the optical module receiver can receive long-distance, multi-channel optical signals with high speed and anti-interference capabilities. When receiving long-distance transmitted optical signals, the signal quality of the received optical signal can be significantly improved.

The utility model relates to the technical field of inductors, and discloses an inductor structure, which comprises an inductor shell, an aviation plug I and an aviation plug II, a PCB (printed circuit board) is arranged at the front position in the inductor shell, an antenna module adaptively matched with the PCB is mounted at the rear position in the inductor shell, and the aviation plug I and the aviation plug II are arranged in the inductor shell. Mounting grooves adaptively matched with the PCB and the antenna module are formed in the front end and the rear end of the inductor shell respectively, a front cover plate is mounted in the mounting groove in the front end of the inductor shell through fixing bolts, and a third rear cover plate is mounted in the mounting groove in the rear end of the inductor shell; by means of the second sealing ring, the third sealing ring and the first sealing ring, the probability that moisture permeates into the inductor shell is reduced when the inductor is used in a humid environment or makes contact with liquid, and therefore the probability that misjudgment frequently occurs on a circuit is reduced, the risks of connection looseness and signal interruption are reduced, and the accuracy of induction data is conveniently improved.