83results about How to "Anti-electromagnetic interference" patented technology

The optical connector comprising a housing (2), a first ferrule section (3) for holding an optical fiber having a damping or filtering function, a second ferrule section (3') for holding an ordinary optical fiber, and an aligning sleeve (5) for aligning the first and second ferrule sections (3, 3') for detachable abutment.

The invention relates to a flexion type acceleration switch. In the switch, a tilted support beam, a mass block and a height adjustable contact component in a group are arranged in an insulation encapsulated shell of the switch, wherein the tilted support beam is of a double layer structure; two ends of the support beam are fixed at two sides of the shell; the double layer tilted support beam supports the mass block in a certain angle alpha to ensure that the mass block is balanced and suspended in an inner cavity of the insulation encapsulated shell; a contact is arranged on the bottom of the mass block; the height adjustable contact is arranged on the insulation encapsulated shell right under the mass block, and remains a certain distance from the mass block; when the double-layered tilted support beam is bent under the action of exterior threshold inertia force, the mass block moves along the exterior acceleration velocity to ensure that elastic contact is formed between the contact on the mass block and the height adjustable contact, and extrudes the contact to form stable contact by means of flexion elastic force. The acceleration switch is characterized by simple structure, adjustable threshold value and strong interference resistance.

The invention relates to a four-dimensional cinema synchronous play method based on Ethernet. The basic idea of the invention is as follows: in a system formed by a controller and two players, playing windows of the two players respectively correspond to the content of a left path and a right path; the controller terminal sends inquiring and control instruction to the two players in definite time; after receiving the inquiring and control instruction, the two players sample the current playing position information and send the current playing position information to the controller terminal; the controller judges the playing position of the players according to the received information, coordinates the playing behavior of the two playing windows of the players so as to form a closed-loop feedback structure. The invention adopts a RJ41 Ethernet card interface, takes a twisted-pair as the connection of a link and uses the Ethernet to transmit instruction, thereby realizing timely and accurate synchronous control.

The invention discloses a distributed temperature sensing optical cable, comprising a fiber; a tight tube wraps the fiber, a flexible metallic tube wraps the tight tube, an aramid fiber reinforcing layer wraps the flexible metallic tube, wire sheathing wraps the aramid fiber reinforcing layer and a low-smoke halogen free flame retardant sheath wraps the wire sheathing. The optical cable can be applied to a distributed temperature monitoring system, which can be used as a temperature sensor and a channel for data information transmission.

The invention discloses a fiber Bragg grating strain-measuring method and a fiber Bragg grating strain sensor. The sensor comprises three fiber Bragg grating sensing modules, a thin-wall ring, a temperature compensating block, signal transmission fibers and a fiber Bragg grating demodulator. The fiber Bragg grating sensing modules are serially connected through the signal transmission fibers and are attached to left and right ends of the thin-wall ring and the surface of the temperature compensating block connected with the thin-wall ring; the fiber Bragg grating demodulator is connected with one of the fiber Bragg grating sensing modules connected to the left and right ends of the thin-wall ring through the signal transmission fiber. The fiber Bragg grating strain-measuring method and the fiber Bragg grating strain sensor have the advantages that measurement readings are more accurate and reliable, electromagnetic interference is resisted, corrosion is resisted, and measuring is automated.

The invention relates to a four-degree-of-freedom inspection mechanical arm and a control system and a control method thereof. The inspection mechanical arm is mounted at the top end of a load centralframework, and comprises an image acquisition device, a telescopic arm, a first rotating joint, a second rotating joint and a linear driving arm, wherein the telescopic arm is horizontally arranged,one end of the telescopic arm is connected to the top end of the load central framework in a rotating manner through the first rotating joint, and the other end of the telescopic arm is in vertical rotating connection with the upper end of the linear driving arm through the second rotating joint; and the image acquisition device is connected to the linear driving arm in a sliding manner and is driven by the linear driving arm to move upwards and downwards. The four-degree-of-freedom inspection mechanical arm and the control system and the control method thereof, provided by the invention, havethe advantages that circumferential rotating and linear running are combined together, so that the inspection mechanical arm can realize non-dead-corner inspection movement in space, can rapidly andaccurately arrive at a preset position in the working range and can be stably kept at the target position; and then, photographing or video recording is carried out by the image acquisition device carried at the bottom end.

The invention discloses a distributed optical fiber sensor based expressway protective fence damage positioning system and a method thereof, and belongs to the optical field. The distributed optical fiber sensor based expressway protective fence damage positioning system includes: expressway detection station modules, wherein each expressway detection station module includes a distributed Brillouin temperature strain analyzer and a channel expansion module; an expressway detection module including strain cables and protective fences; and an expressway communication module including a network unit, an expressway data center, and a service terminal. The strain cables are fixedly mounted on the protective fences in a S-shaped arrangement manner; top ends of the strain cables are connected toports of the channel expansion modules through end-to end optical fiber splices; ports of the channel expansion modules are connected to optical interfaces of the distributed Brillouin temperature strain analyzers through optical fiber patch cords; the distributed Brillouin temperature strain analyzers are connected to an expressway data center through the network unit; and the expressway data center is connected to the service terminal. The distributed optical fiber sensor based expressway protective fence damage positioning system effectively achieves the natural disaster early warning and special traffic safety accident alarm along the expressway.

The invention discloses a multi-polarization conformal antenna used for a capsule endoscope. The multi-polarization conformal antenna comprises an antenna radiation patch unit, a metal floor, a dielectric substrate, coaxial feed and a capsule shell. The antenna radiation patch unit is arranged on the upper surface of the dielectric substrate. The metal floor patch is arranged on the lower surfaceof the dielectric substrate. The whole antenna is nested in the capsule in a conformal bending way so as to form an internal hollow structure. The whole antenna radiation patch unit has a parallelogram structure. Two slot structures symmetrical about the longitudinal axis are arranged near the feed point, and a rectangular patch is connected inside by using a high impedance line to be perpendicular to the slot structures. The antenna excites the radiation patch unit through a 50ohm coaxial cable. The multi-polarization conformal antenna has the advantages of being flexible in conformation, small in internal space volume occupation of the capsule, multi-polarization, anti-electromagnetic interference and wide in band and is suitable for the capsule endoscope system and can radiate or receive arbitrary polarized waves.

The invention provides an intelligent combustible gas detector and an alarm method, relates to the technical field of combustible gas detection equipment, and mainly solves the technical problems of incapability of detecting various combustible gases, insensitivity to environment temperature detection and insufficiency in intelligent alarm of a detector. The detector comprises an NB-IOT module, alocal alarm device, an environment detection module, a pyroelectric infrared sensor and a controller. When it is judged that the environment parameters exceed a preset value and someone exists, the local alarm device is controlled to send out an alarm signal, and the NB-IOT module is closed; and when it is judged that the environmental parameters exceed the preset value but no person exists, alarminformation is sent to a remote monitoring platform through the NB-IOT module. The detector not only monitors the concentration of methane gas, but also monitors the concentration of carbon monoxidegas, can constantly monitor the temperature in the environment and whether people exist in the environment, and has the characteristics of simplicity and convenience in operation, convenience, practicability and multiple functions. The detector not only gives an alarm to equipment, but also can give an alarm to a user remotely, and has the characteristics of intelligence and humanization.

An optical fiber sensing spring of the present invention includes a longer cylindrical tension coil spring, a shorter cylindrical compression coil spring and a longer cylindrical tension coil spring that are connected in series to form a spring having the same inner and outer diameters. A single-mode optical fiber manufactured with a long section of fiber grating is placed in the manufactured spring. This section of the fiber grating is tensed to two ends of the cylindrical compression coil spring having a predetermined gauge length, and the force applied is released. A pre-tensing method for providing a maximum tolerable compression strain and manufacturing technology for this sensing element are then achieved. Thus, the self-tensed optical fiber sensing spring structure satisfies a standard 0.9 mm outer diameter, is fully spring jacketed by the full spring jacketing and protection layer, and forms a linear stress-strain relationship in an elasticity stretched elastic region.

The present invention discloses a voltage-resistant cable, comprising four conductors, wherein each conductor is wrapped with an insulating layer and a hard protecting layer from the inside out, the cross section of each hard protecting layer is in an equilateral triangle shape, the four hard protecting layers are tightly attached with each other to form another equilateral triangle, and the equilateral triangle consisting of the four hard protecting layers is wrapped with a middle coating layer, a shielding layer and an outer sheath successively, the cross sections of the middle coating layer, the shielding layer and the outer sheath are equilateral triangles. The voltage-resistant cable of the present invention is good in voltage resistant capacity and is not easy to damage.

The invention discloses a differential antenna and a circuit control system of a digital television. The circuit control system comprises a differential mode antenna, a control unit and a switch circuit, wherein the differential mode antenna receives a broadcasting signal, and generates a differential radio frequency signal; the differential radio frequency signal comprises a first/positive signal and a second/negative signal; the control unit generates a selection signal according to a watched channel; the switch circuit comprises a plurality of matching circuits and a switch control circuit; each matching circuit can optimize a part of digital television bands; the switch control circuit receives the selection signal to control the positive and negative signals to generate an optimized positive signal and an optimized negative signal after passing through a first matching circuit and a second matching circuit respectively, transmits the optimized positive and negative signals to the control unit, and the first and second matching circuits optimize the same band; therefore, the control unit can generate a watched channel signal according to the optimized positive and negative signals.

The invention discloses a high-intensity temperature measuring fiber grating sensor of a transformer winding. The sensor comprises a sensing spherical shell cover, a plurality of grating guiding sleeves are evenly connected outside the sensing spherical shell cover, rubber extension blocks are fixedly mounted on two ends of insides of the grating guiding sleeves, gratings are inserted into the grating guide sleeves, the gratings are parabolic in the grating guide sleeves, the gratings penetrate through the rubber extension blocks and are fixedly connected with the outer sides of the gratings,one ends of the gratings are connected with the sensing spherical shell cover, the other ends of the gratings are jointly connected with fibers, the outer sides of the fibers are sleeved with a metalwire mesh sleeve, one ends of the fibers are connected with a demodulator and a DSP chip in sequence, and the gratings are evenly distributed on the sensing spherical shell cover. The sensor can detect the temperature around the transformer, the detection is more standard, errors are smaller, the grating guide sleeves and the rubber extension blocks protect the gratings, the metal wire mesh sleeveprotects the fibers, performance of the gratings and the fibers is stable, and the sensor detects the temperature with high accuracy.

A novel lead-acid battery temperature liquid level sensor comprises a sensor outer cover (1). A sensor inner core (2) is arranged in the sensor outer cover (1). The sensor inner core comprises a liquid level floater (3) arranged outside the lower portion of an inner core shell (5), a buckle (4), a temperature sensor (6) arranged in an inner cavity of the lower portion of the inner core shell (5), and a reed switch (7). The novel lead-acid battery temperature liquid level sensor has the advantages that the liquid level sensor and the temperature sensor are integrated, the size of sensors is reduced, a liquid injection opening of a lead-acid battery is used for installation, the size of the liquid injection opening is the same as that of an original liquid injection opening cover, the daily utilization of the lead-acid battery is not influenced, and frequent sensor detachment and installation are not needed in the process of utilizing and charging a storage battery. A wave preventing cover and an air discharge hole are arranged on an outer cover of each sensor, so that measuring errors caused by electrolyte boiling liquid fluctuation in the charging process is prevented. By the adoption of the digital type temperature sensor DS18B20, the novel lead-acid battery temperature liquid level sensor has the advantages of being simple in wire connection, not needing an external adjusting circuit, high in precision, good in reliability and strong in anti-jamming capability.

The invention discloses a dual-threshold three-stable-state collision sensor, belonging to the technical fields of precision micro electro mechanical systems and collision sensors. The dual-threshold three-stable-state collision sensor is mainly characterized in that an outer mass block, an inner mass block, parallel beams, a fixed block, a first contact and a second contact constitute an inside/outside-nested bilayer oblique support beam structure. According to the invention, the collision strength grade can be judged quickly and a control signal can be sent out without a processor and a driving device. When no dangerous conditions exist, the sensor is in a first stable state, when external collision strength exceeds a first danger threshold value and smaller than a second danger threshold value, the inner mass block rapidly comes into contact with the first contact, and the sensor is in a second stable state; when the external collision strength exceeds the second danger threshold value, the outer mass block and the inner mass block come into contact with the first contact and the second contact rapidly at the same time, and the sensor is in a third stable state; and when two collisions occur continuously, the first contact and the second contact of the sensor are connected in sequence. The dual-threshold three-stable-state collision sensor disclosed by the invention has the characteristics of simple structure, multi-threshold-value intelligent sensing capability, reliability in contact, no need of driving, and strong electromagnetic interference resistance.

The invention relates to a passive heat reactive fire-fighting starter which is used in a supersonic dry powder fire extinguisher. The passive heat reactive fire-fighting starter comprises a pedestal and a blank cap body which is fixed on the pedestal; a magnetic power source which consists of a magnetic rod and an armature and is arranged in the pedestal and the blank cap body; a heat reactive ejection mechanism is arranged on the blank cap body, supports a dowel by a heat reactive element and locks the magnetic rod by the dowel to cause the magnetic rod to locate in the position to prop and press against a spring to shrink. When ambient temperature reaches a preset temperature, the heat reactive element is started, so that the magnetic rod is sprung out and goes through the armature to generate induction current so as to start an igniter to ignite. The passive heat reactive fire-fighting starter of the invention realizes heat reactive passive startup and provides convenient conditions for the supersonic dry powder fire extinguishers to be conveniently used in outdoor passive areas and has the advantages of rational structure, quick response, reliable action, high sensitivity, high safety, strong environmental adaptability, electromagnetic interference resistance, etc.

The invention discloses a mechanical direct-current circuit-breaker controller. A controller circuit comprises a power supply module, a communication module, a button module, a main control module and a driving module; the driving module is composed of two sub-units including a mechanical switch driving unit and a current conversion loop driving unit; the mechanical switch driving unit is used for controlling charging/discharging switches of separating/closing energy-storage capacitors in a mechanical switch operation mechanism-repulsion mechanism power supply cabinet; the mechanical switch driving unit comprises driving circuits of charging switch IGBTs of a rapid separating capacitor, a slow separating capacitor and a closing capacitor, and driving circuits of discharging switch thyristors of the rapid separating capacitor, the slow separating capacitor and the closing capacitor; and the current conversion loop driving unit is used for controlling a trigger switch of a current conversion loop. The mechanical direct-current circuit-breaker controller disclosed by the invention is simple in structure, small in volume, low in cost and operation power consumption and high in reliability, and has an electromagnetic shielding effect; and thus, multiple control modes, such as local operation and remote communication, can be realized.

The invention discloses a combined control cable. The cable core of the control cable is formed by twisting an optical cable and a plurality of insulating control line cores. The optical cable comprises an optical fiber and a primary coating layer, a secondary coating layer, a knitted reinforcing layer and a polyolefin sleeve layer extruded on the knitted reinforcing layer, which are sequentially arranged on the optical fiber. Each insulating control line core comprises a tin-plated soft copper conductor and a polyolefin insulating layer. A filling layer is arranged in the twisting clearance of the optical cable and the insulating control line cores. A belting layer, a tin-plated copper wire shielding layer and a polyolefin outer sheath are respectively and sequentially wrapped, knitted and extruded outside the cable core and the filling layer. According to the combined control cable, high tenacity optical cable and the control cable are integrated in the same cable, thereby realizing simultaneous transmission of electric energy and data signals; and the combined control cable also has good flame resistance and good diameter axial direction water resistance performance.

The invention discloses a mineral insulating metal shielded monitoring-type coal mine fireproof cable, comprising a core; the core is formed by stranding two mineral insulating core wires and a monitoring core wire; voids of the core is filled with glass fibers; an inorganic heat-insulating fireproof layer is extruded outside the core; a third mineral insulating layer is extruded outside the inorganic heat-insulating fireproof layer; a metal conductive tube is arranged outside the third mineral insulating layer; the metal conductive tube is coated with a coating fireproof layer that is wrappedwith nonwoven, an aluminum tin foil is arranged outside the nonwoven and is wrapped with double-side synthetic mica taping, and an outer sheath is extruded as an outermost layer of the cable and is coated with fireproof mud. The mineral insulating metal shielded monitoring-type coal mine fireproof cable has good electrical conductivity, mechanical physical properties and fireproof property, alsohas good noninflammability, can ensure fireproofing power supply in a fire continuation time in case that the cable is on fire, and never experiences continued burning and produces no toxic smoke.

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.