75results about How to "Strong resistance to electromagnetic interference" patented technology

The invention provides an electromagnetic shielding conformal optical window with a longitude and latitude-shaped mesh structure, which belongs to the technical field of electromagnetic shielding of optical transparent pieces. The electromagnetic shielding conformal optical window comprises a conformal optical window and is characterized in that: (1) a longitude and latitude-shaped metal mesh is manufactured on the inner side surface of the conformal optical window shell; and the longitude and latitude-shaped metal mesh covers the whole inner side surface of the conformal optical window shell; or (2) a longitude and latitude-shaped metal mesh and a conformal optical window inner shell are manufactured on the inner surface of the conformal optical window shell from outside to inside in turn; the longitude and latitude-shaped metal mesh covers the whole inner surface of the conformal optical window shell and outer surface of the conformal optical window inner shell; the latitude-shaped metal mesh consists of metal longitudes and metal latitudes; the metal latitudes are uniformly arranged in an equivalent centre angle along a circumferential direction; the metal longitudes are arranged at equal intervals according to a metal mesh cycle along a generatrix direction; and the metal longitudes and the metal latitudes are electrically connected with one another. The electromagnetic shielding conformal optical window with the longitude and latitude-shaped mesh structure is suitable for electromagnetic shielding technology of military or civil conformal optical windows for remote measuring and sensing, medical diagnosis, secret communication, aerospace equipment and the like.

The invention discloses a signal interference canceller and a signal interference cancelling method. The signal interference canceller converts an electric interference signal into an optical modulation signal and then transmits the signal to an optical delay line for changing the corresponding optical length passed by the optical signal, so as to realize the delaying of the optical signal and finally converts the optical signal to an electric signal, thereby realizing to transfer the phase of a RF electric signal by (2n+1)180 degrees; wherein, n is equal to 0, 1, 2, 3, and the like; finally the interference signal which affects useful signals is filtered by cancelling. The invention can effectively remove useless signals received by a receiving terminal during the process of multi-carrier transmission; moreover, the invention is characterized by high delaying precision and high electromagnetic interference resistance.

The invention discloses an optical pulse synchronizing signal source based on waveguide coupling microdisk photon molecular lasers. The optical pulse synchronizing signal source comprises a substrate and an upper structure. The upper structure is formed on the substrate and comprises the microdisk photon molecular lasers with electric injection or optical injection and two strip-shaped output waveguides, and the microdisk photon molecular lasers are manufactured in the middle on the substrate. The two strip-shaped output waveguides are manufactured on the substrate and are laterally coupled or perpendicularly coupled with the microdisk photon molecular lasers. Ports are formed in the same sides of the two strip-shaped output waveguides respectively so as to output beat frequency optical pulse synchronizing signals of the microdisk photon molecular lasers. According to the optical pulse synchronizing signal source, when electric signals or optical signals are injected into the two microdisk lasers, two paths of optical pulse strings which are identical in frequency and fixed in pulse width and complement each other can be output, and the on-chip optical pulse synchronizing signal source with pulse generating frequency on a microwave band is achieved.

The present invention discloses a capacitance angular displacement sensor. The capacitance angular displacement sensor comprises a capacitance position-sensing unit and a signal processing circuit. The capacitance position-sensing unit includes a stator and a rotor, the rotor rotates to cause a regular change between the rotor and the stator, and the stator detects the change of an electric field and convert the change of the electric field to periodic simulation signals for outputting; the signal processing circuit is configured to collect the simulation signals and output an angular displacement digital quantity, and the capacitance position-sensing unit is connected with the signal processing circuit. The present invention provides a capacitance angular displacement sensor with good anti-jamming performance, simple structure and small size.

The invention discloses a device and a method for obtaining energy from a high voltage transmission line, and belongs to the technical field of high voltage technologies and power source technologies.The device comprises a high-voltage capacitor, a first-stage step-down transformer, a bidirectional thyristor module, a rectifier module, a filter capacitor, a voltage monitoring module, a thyristordrive module, a DC/DC voltage regulator module, an overvoltage suppression module and a shielding box. The principle of capacitance voltage division is employed, the high-voltage capacitor set is connected in series with the primary side of the transformer to effectively improve the output power of the device for obtaining energy, two-stage voltage reduction is employed to reduce the insulation design requirement of the transformer and reduce the size of the transformer. The wiring mode is flexibly configured between the high-voltage capacitor and the first-stage step-down transformer to achieve energy obtaining at a high level end between a phase and a ground and a low level end between the phase and the ground and between phase and phase, and the device and the method for obtaining energy from the high voltage transmission line can supply power for various electric devices.

The present invention relates to the technical field of the light source driving, and more particularly relates to and discloses a drive circuit for a high-power LED light source, including the PFC circuit, further comprising a multi-string conversion circuit LLC transformer, the transformer of multi-string conversion circuit PFC circuit LLC connection for the constant current driver for LED array. The multi-string conversion circuit includes an isolation transformer LLC half-bridge, a number of the same isolation transformers, isolation transformers more than the original series and connected with the side of the half-bridge, each isolation transformer secondary side connection and two anti-LED string. A high-power LED light source driving circuit through the use of multi-string transformer LLC control, constant current drive multiple LED strings, the output section no longer have many DC/DC converter, which greatly reduces the number of components, but can also reduce the size of the printed circuit board, with low cost, high efficiency, high reliability, good resistance to electromagnetic interference and so on.

The invention discloses a multifunctional all-optical fiber non-intrusive state monitoring thin mat. The thin mat comprises a first mat layer, a second mat layer and a state monitoring system, whereinthe state monitoring system comprises a power supply, a state sensor, a photoelectric converter, a microprocessor module, a display module, a warning module, a storage module and a data transmissionmodule; the state sensor is arranged between the first mat layer and the second mat layer, a first optical fiber is arranged between a light source and an input end of the state sensor, and a second optical fiber is arranged between an output end of the state sensor and the photoelectric converter; and the microprocessor module comprises a microprocessor, an analog-digital conversion module and astate analyzing module, and the analog-digital conversion module is connected between an output end of the photoelectric converter and the microprocessor. The multifunctional all-optical fiber non-intrusive state monitoring thin mat can be applied to non-contact human body state monitoring such as bed-off detection, bed-sitting detection, body movement recording and sleeping posture monitoring andis wide in application range.

The invention discloses a preparation method of a hydrogen sensor. The method comprises the following steps: depositing a chalcogenide soft glass film on a substrate; preliminarily processing the chalcogenide soft glass film into a chalcogenide soft glass micro-cavity by adopting a photoetching and etching process; corroding a protective layer under the micro-cavity of the chalcogenide soft glass;selectively depositing a metal palladium film as a hydrogen absorbing layer; and processing the substrate to complete the preparation of the hydrogen sensor. The invention further discloses a hydrogen sensor. The sensor comprises a micro-cavity substrate, and a protective layer, a chalcogenide soft glass micro-cavity and a hydrogen absorbing layer which are sequentially prepared on the substratefrom bottom to top. According to the hydrogen sensor and the preparation method thereof, an echo wall mode optical micro-cavity is adopted as a basic sensing unit, and the sensor has the advantages oflow power consumption, strong electromagnetic interference resistance, good safety and high flexibility.

The invention discloses a ship used digital communication cable characterized by low-smoke, halogen-free, and flame-retardant, and belongs to the technical field of cables. The digital communication cable comprises four pairs of twisted pair wires which are separated by a cross; the twisted pair wires are correspondingly arranged inside four quadrants separated by the cross; a polyester belt is longitudinally packaged on the twisted pair wires and the cross; an aluminum foil inner shielding layer longitudinally packages the polyester belt; a cross flow conductor, which is in contact with the aluminum foil inner shielding layer, is arranged on the inner side of the aluminum foil inner shielding layer, an inner sheath is arranged outside the aluminum foil inner shielding layer; an outer shielding layer, which is formed by weaving copper wires, is arranged outside the inner sheath; and an outer sheath, which is made from a non-halogen material, is arranged outside the outer shielding layer. The cable has double shielding effects, so that the shielding effect thereof is better; the cross flow conductor can be earthed, thereby preventing electromagnetic signals generated inside from interfering other electronic equipment; and the cross is arranged for reducing mutual signal interference between the twisted pair wires. The digital communication cable has the advantages of good anti-electromagnetism interference performance, and little distortion during transferring the signals, and can be applied to data communications for ships.

The invention discloses a corrosion-resistant manipulator and a preparation method thereof. 1) firstly mix nodular cast iron, silicon carbide particles, graphite fibers, manganese, nickel, chromium, ceria and vanadium pentoxide and then carry out the first smelting to obtain Molten iron M1; 2) adding manganese trioxide, pentlandite, boron nitride, molybdenum sulfide, carbon black and niobium into the molten iron M1, followed by a second smelting to obtain molten iron M2; 3) adding the The molten iron M2 is casted to obtain a parison, and the parison is heat-treated to obtain the corrosion-resistant mechanical arm. The excellent corrosion resistance of the robotic arm enables it to be exposed to the production workshop for a long time, which ensures the progress of production, reduces the maintenance probability of the robotic arm, and greatly improves the service life of the robotic arm working in the workshop.

The invention discloses an anti-electromagnetic interference cable sheath for radar and a preparation method of the anti-electromagnetic interference cable sheath. The preparation method comprises the following steps: blending polytetrafluoroethylene resin, butadiene styrene rubber, butadiene rubber, acetic ether, toluene, polydimethylsiloxane and styrene so as to obtain a mixture M1; blending the mixture M1, an anti-electromagnetic interference filler, inositol hexaphosphate, epoxidized triglyceride fatty acid, acrylate and a vulcanization accelerator TMTD, so as to obtain a mixture M2; and extruding the mixture M2 by virtue of an extruder, and carrying out granulation and processing, so as to obtain the anti-electromagnetic interference cable sheath for the radar, wherein blending processes comprise a first blending process and a second blending process, and the temperature of the second blending process is 70-90 DEG C higher than that of the first blending process. The prepared anti-electromagnetic interference cable sheath has excellent electromagnetic interference resistance and is simple and easily available in raw materials, low in production cost and long in service life.

The invention discloses a device and a method for taking energy at a high potential end of a transmission line, belonging to the cross technical field of high voltage technology and power supply technology. The device of the invention comprises a capacitor voltage divider, a rectifying module, a DC/DC voltage regulating module, an overvoltage suppressing module and a power supply housing. The invention solves the problem of providing stable and reliable direct current power supply for various on-line monitoring devices located at the high potential end of the transmission line and the main equipment of the substation, The utility model improves the output power of the power supply, provides a flexible and convenient regulation mode for outputting a variety of commonly used DC voltage values, ensures that the insulation requirements of the corresponding transmission line voltage grades are met, has good electromagnetic interference resistance and reduces the cost of the transmission line energy taking device.

The invention discloses a numerical control high-voltage direct-current generation device and method, and belongs to the technical fields of high-voltage and power supply. The numerical control high-voltage direct-current generation device comprises a rectifying module, a filtering and voltage-stabilizing capacitor C1, a DC/DC step-down module, a filtering and voltage-stabilizing capacitor C2, aninverter circuit, a high-frequency transformer, a voltage doubling rectifying circuit, a voltage-stabilizing decoupling capacitor C3, a resistance voltage divider and a controlling and driving system.Through adoption of the numerical control high-voltage direct-current generation device, a stable and reliable direct-current power supply is provided for a lightning arrester aging test power supplyof a high-voltage direct-current transmission system, so that the output current of a direct-current generator is improved. The direct-current power supply can be provided separately, or connected inseries with other corrugated power supplies to construct a special waveform generator. When the numerical control high-voltage direct-current generation device works in series with other power supplies, the direct-current output voltage waveform keeps stable, and high electromagnetic interference resistance is achieved.

The invention provides an integrated semiconductor bridge transduction element. The integrated semiconductor bridge transduction element comprises more than two semiconductor bridges, wherein at least one semiconductor bridge is used for absorbing electromagnetic interference energy, and other semiconductor bridges are used for converting input energy into plasma ignition energy; a resistance value, a bridge area and a bridge shape of at least one semiconductor bridge are different from that of other semiconductor bridges; resistance values, bridge areas or bridge shapes of all semiconductor bridges are determined according to ignition positions and timing sequence; all of the semiconductor bridges are connected in series or in parallel or are in series-parallel connection, and the resistance values, the bridge areas or the bridge shapes of all of the semiconductor bridges can be determined according to the ignition positions and the timing sequence; and open circuit resistors are integrated in the bridge areas or electrode areas. According to the integrated semiconductor bridge transduction element, the safety and the reliability are increased, and multi-point sequential ignition can be realized.

The invention relates to technology for the field of rotating speed counting equipment of rotating objects, in particular to a passive rotating speed counting device and a counting method thereof, which has the advantages that the rotating speed measurement is free from interference, high in measurement accuracy, passive and safer, and is suitable for rotating characteristic measurement under severe environments such as high temperature, low temperature, underwater, high electromagnetic interference and the like. The device comprises a processing device, an optical fiber transmission channel and a turntable, wherein the optical fiber transmission channel comprises a transmitting optical fiber and a receiving optical fiber; the transmitting optical fiber transmits an optical signal by a transmitting core wire; the receiving optical fiber receives the optical signal transmitted by the transmitting optical fiber by a receiving core wire; the turntable is arranged on a rotating speed output shaft of a rotating speed output device to be measured and is blocked on an optical path between the transmitting optical fiber and the receiving optical fiber; at least one group of through holes are arranged on the turntable; in the process of rotating the turntable, the through holes are intermittently connected with the optical path between the transmitting optical fiber and the receiving optical fiber; and the processing module is used for processing the optical signal received by the receiving optical fiber so as to calculate the rotating speed.

The invention discloses a novel device and a novel method for utilizing optical grating detection technology to measure acceleration, and belongs to the field of sensing detection. The device senses the acceleration through a mass block 1, wherein one end of the mass block 1 is connected to an anchor point 4 through an elastic beam 7, while the other end is connected with a movable grating strip 2 which forms an optical grating pair with a fixed grating strip 5. During work, incident light 6 irradiates on the optical grating pair, and the emergent light 3 of the incident light 6 is split into different diffraction levels. Under the action of the acceleration, the mass block 1 drives the movable grating strip 2 to generate certain displacement x so as to change the relative position between the movable grating strip 2 and the fixed grating strip 5, and cause the light intensity on different diffraction levels in the emergent light 3 to change correspondingly. Therefore, aiming at specific diffraction levels, input acceleration signals are reversely deduced according to the light intensity. The method and the device for measuring the acceleration have the advantages of low temperature drift, strong electromagnetic interference resisting performance, high sensitivity, and the like, and are suitable to be operated in abominable environment.

The invention discloses a high-speed railway network data cable comprising a main conductor and control conductors. The main conductor and the control conductors are respectively subjected to extrusion molding to form in a double-layer expanded-plastic insulating layer, and are sequentially coated with a non-hygroscopic internal isolation layer, an aluminum-plastic composite belt interlocking armor layer, a tinned-copper-wire braid shielding layer, a non-hygroscopic external isolation layer, a glass fiber braid layer, a water stopping yarn filling layer and a low-smoke-zero-halogen thin-wall outer sheath after being bunched. A low-smoke-zero-halogen inflame-retardant material filing core is arranged on the inner side of the non-hygroscopic internal isolation layer. The high-speed railway network data cable has the advantages that standard stranded structures are combined with bunched or stranded structures, composite shielding formed by aluminum-tape lapping is added to the shielding layer, shielding effect of the cable is improved, the tinned-copper-wire braid shielding layer is optimized, braiding density is larger than 90%, the cable has excellent electromagnetic interference resistance performance, low smoke, zero halogen and flame retardance are realized, and physical and mechanical property is excellent.

The invention discloses an anti-electromagnetic cable sheath and its preparation method. The preparation method includes steps of performing thermal treatment on polytetrafluoroethylene resin, butadiene styrene rubber, butadiene rubber, turpentine oil, methylbenzene, polydimethylsiloxane and styrene to obtain a mixture M1; performing rubber mixing on the mixture M1, anti-electromagnetic disturbance filler, inositol hexaphosphate, epoxidation triglyceride fatty acid, acrylic ester and vulcafor TMTD to obtain a mixture M2; extruding and prilling the mixture M2 through an extruder, and processingto obtain the anti-electromagnetic cable sheath, wherein the thermal treatment comprises first thermal treatment and second thermal treatment which are carried out in order; the temperature of the second thermal treatment is 70-90 DEG C higher than that of the first thermal treatment. The anti-electromagnetic cable sheath prepared by the preparation method has excellent anti-electromagnetic disturbance performance, simple and easily-obtained raw materials, low production cost, long service, and excellent anti-electromagnetic disturbance performance.

The invention discloses a 230 MHz LoRa type communication gateway and a system thereof and relates to the technical field of communication gateways. The 230 MHz LoRa type communication gateway comprises a main control module, a communication module, a LoRa radio frequency transceiving module, a temperature sensor, a photosensitive sensor, a humidity-sensitive sensor, a miniature cooling fan, a time service module and a monitoring module, wherein the communication module comprises an Ethernet communication module, a 4G communication module, a WiFi module, an optical fiber module and a 2.4 GHz LoRa module; the Ethernet communication module is connected with the main control module through an RMII interface; the 4G communication module and the WiFi module are connected with the main control module through USB interfaces; the optical fiber module is connected with the main control module through an ST interface; the 2.4 GHz LoRa module is connected with the main control module through an SPI interface; and the LoRa radio frequency transceiving module comprises an uplink data module and a downlink data module. According to the 230 MHz LoRa type communication gateway and the system thereof, through the arrangement of the temperature sensor, the photosensitive sensor and the humidity-sensitive sensor, the temperature, the humidity and the external optical radiation of the current gateway can be conveniently detected.

The invention discloses an ultrahigh-speed data transmission cable and a manufacturing process thereof. The ultrahigh-speed data transmission cable comprises graphene silver-copper alloy inner conductors which are twisted concentrically, and a sheath-foam-sheath tetrafluoroethylene-hexafluoropropylene copolymer insulating layer wrapping the conductors, wherein the cable core employs a star-twist group structure, and is additionally provided with a filling material, a silver-plated copper-clad steel flat wire and a silver-plated copper-clad nickel round wire are woven outside the conductors, and the sheath is made of a cross-linked ethylene tetrafluoroethylene material. According to the technical method, the cable has the advantages of ultra-light property, high rate, high strength, high electromagnetic interference resistance and high-reliability and high-speed data transmission.

The invention discloses a manufacturing method of a two-in-one structure inductor with an air gap formed in the side surface. A base of the inductor is provided with four electrode grooves, so electrodes can be conveniently installed without using an additional positioning device for positioning. A tail end of the coil is close to a Z-shaped extension sheet of the electrode, so the extension sheetwraps the tail end of the coil and is pressed by a jig, the extension sheet of the electrode is Z-shaped, the extension sheet can just wrap the tail end of the coil, wrapping and welding of the extension sheet and the coil achieve a better conductive effect, and loss is effectively reduced. Compared with an inductor with an air gap formed in the front face, the inductor of the two-in-one structure with the air gap formed in the side surface and manufactured through the manufacturing method is compact in overall structure, small in size and good in performance. The preparation method disclosedby the invention is simple to operate and convenient to assemble, an air gap is formed in the formed independent complete side surface during production, and working efficiency is high.

The invention discloses a photoelectric online detector of an anchor clamping sheet working surface, which is characterized by comprising a lamp optical system, an image optical system, an image recognition system, a control system and a mechanical movement and positioning system, wherein the lamp optical system is arranged right above the position supported by the anchor clamping sheet and connected with the image optical system by the mirror of the image optical system; the image optical system is arranged right above the mirror of the image optical system and is connected with the image recognition system by an industrial camera; the image recognition system is realized by a program in a computer; the control system is connected with the image recognition system by a communication protocol; and the mechanical movement and positioning system is connected with the control system by a linear electric motor and a data line. The invention has the advantages of high resolution ratio and detection accuracy rate, strong anti-jamming capacity to environment, capacity of automatically getting rid of the unqualified products, easy installation, and easy operation.

The invention provides a novel fiber high-voltage sensor, including a pressure inlet, a pressure source joint, a base, a shell, an optical cable waterproof joint, a sensing diaphragm, a multimode fiber, an SMA metal optical fiber core and an armored optical fiber jacket. The SMA metal optical fiber insertion core and side faces of the base are sealed through uniform smearing of epoxy resin glue, and a bottom surface is connected through laser welding; the sensing diaphragm is a square diaphragm with a cylindrical Fabry-Perot microcavity, the sensing diaphragm and the SMA metal optical fiber insertion core are fixed through epoxy resin, and before fixing, signal quality is observed through a polarization low-coherent interference interrogator to ensure the alignment property of the diaphragm and the insertion core; the pressure source joint and the side faces of the base are sealed through uniform smearing of epoxy resin glue, and the bottom surface is connected through laser welding; and the base and the shell are connected through threads, and the shell and the optical cable waterproof joint are connected through threads. The novel fiber high-voltage sensor is wide in range of application, strong in anti-electromagnetic interference, and low in power consumption, has relatively low requirement for a light source, and is simple in structure, convenient to maintain and low in cost.

The invention discloses a flame-retardant insulating material, comprising a PTT fiber base layer, an insulating layer and a thermal insulation layer. The insulating layer comprises the following raw materials by weight: 25 to 34 parts of organic silicone resin, 15 to 20 parts of an organosilicon cross-linking agent, 15 to 20 parts of silica, 11 to 16 parts of silicon hydroxide, 10 to 15 parts of magnesium hydroxide, 6 to 8 parts of iron oxide, 5 to 7 parts of barium sulfate, 5 to 6 parts of magnesium silicate, 3 to 4 parts of talcum powder, 3 to 4 parts of a lubricant, 4 to 5 parts of an anti-oxidant, 2 to 3 parts of a compatilizer and 1 to 2 parts of an organosilicon leveling agent, wherein the thermal insulation layer is a glass fiber layer. The flame-retardant insulating material has excellent performance and the characteristics of low smoke, no toxicity, no halogen and flame retardation; meanwhile, the flame-retardant insulating material has high tensile strength and shows excellent anti-electromagnetic interference performance when withstanding external mechanical force; and the flame-retardant insulating material is applicable to insulating layers of a variety of electric wires and cables.