25results about How to "Immune to electromagnetic interference" patented technology

The invention provides a method for testing the dynamic strain of the surface of a rotating body in an electromagnetic environment. The method comprises the following steps: constructing a bridge by using strain gauges and acquiring dynamic characteristic data of the rotating part under actual constraint conditions; performing simulation calculation according to the dynamic characteristic data, and determining the optimal pasting position of the strain gauge; pasting a strain gauge and formulating a wiring scheme of a strain gauge wire; the strain gauge is connected with a voltage signal amplifier, the amplified signal is connected with a data acquisition system through a conductive slip ring, and the amplified strain signal is recorded and processed; acquiring strain signals in real time and taking the strain signals as test data, and performing whole-course test in a full-rotating-speed range to complete dynamic strain test on the surface of the rotating body. The system has high sensitivity, the sensitivity and the measurement precision of the system are improved through full-bridge configuration, larger output signals are provided, the full bridge can achieve temperature compensation through symmetrical circuit design, and the system has good linear output characteristics and facilitates signal processing and analysis within the strain range.

The invention relates to a method, device and equipment for estimating the position of an elevator, a storage medium and a program product. The method comprises the steps that electric signal collection is conducted on the elevator traction machine, and voltage and current in a target time period are obtained; respectively determining the voltage frequency and the current frequency of the elevator traction machine according to the voltage and the current; the angular velocity of the elevator traction machine is calculated according to the voltage frequency, the current frequency and the number of pole pairs of the motor, and the comprehensive angular velocity is determined based on the voltage effective value corresponding to the voltage and the angular velocity; the start-stop time point of the elevator traction machine is determined, data cleaning is conducted on the comprehensive angular speed according to the start-stop time point, and the target angular speed is obtained; the target angular speed is input into an elevator system mathematical model for displacement calculation, and displacement information of the elevator car is obtained; and the position information of the elevator car is determined based on the displacement information and accumulated displacement information of the elevator car in the ascending or descending stage. By adopting the method, the estimation accuracy of the elevator position can be effectively improved.

The invention discloses a stone cultural relic crack filling slurry curing process parameter in-situ online detection method, which comprises the following steps: respectively preparing an optical fiber temperature-sensitive sensor, an optical fiber strain sensor and an optical fiber humidity-sensitive sensor by adopting an optical fiber Bragg grating, and integrally packaging each sensor to obtain a filling slurry curing process parameter detection device; a plurality of prepared filling slurry curing process parameter detection devices are adopted and are vertically placed at different height positions in the cracks of the stone cultural relics respectively, each filling slurry curing process parameter detection device is connected to a corresponding signal input end of a modulation-demodulation instrument, and when filling slurry is injected into the cracks of the stone cultural relics, the modulation-demodulation instrument is connected with the corresponding signal input end of the modulation-demodulation instrument. Drift data of center wavelengths corresponding to all sensors in all filling slurry curing process parameter detection devices are collected through a modulation-demodulation instrument and demodulated; and then demodulated data information is transmitted to a computer, and the computer calculates parameters of the filling slurry curing process at different height positions of the stone cultural relic crack.

The invention discloses a distributed optical fiber longitudinal difference box transformer substation protection measurement and control system, which adopts an enhanced unit case, is designed according to strong vibration resistance and strong interference resistance, and mainly comprises a power supply output plug-in, an input plug-in, a communication plug-in, a CPU plug-in, an alternating current plug-in and a man-machine conversation plug-in, through the transformer protection measurement and control unit, the switch cabinet protection measurement and control unit and the central monitoring unit, functions of data acquisition and control, electric quantity protection, non-electric quantity protection, optical fiber differential protection, arc light protection, temperature monitoring and gas leakage monitoring are completed, and data communication functions of equipment such as a communication management machine and an optical fiber switch can be integrated. Communication information of intelligent equipment to which the power generation subsystem belongs is centralized and transmitted, and the self-healing ring optical fiber Ethernet is accessed to a booster station integrated automation system, so that remote management and automatic monitoring of the booster station on the wind power plant are realized, and a comprehensive and intelligent operation management mode of the wind power plant is satisfied.

The invention provides a hand perception sensor based on FP and FBG optical fiber sensing, which comprises a Fabry-Perot cavity (FP), a single-mode optical fiber and at least one Bragg grating (FBG), the Fabry-Perot cavity is positioned at one end of the single-mode optical fiber, and the Bragg grating is embedded in the single-mode optical fiber. The FP optical fiber sensor and the FBG optical fiber sensor are adopted, tiny strain changes can be detected by measuring input light and through changes of reflection wavelengths of optical fibers, and the soft robot shape sensing device has the advantages of being high in sensitivity, large in elasticity, high in resolution ratio, free of electromagnetic interference and the like in the aspect of sensing the shape of a soft robot. The sensing system is integrated into the soft finger and used for detecting bending and deformation behaviors of the joint of the soft finger, pressure monitoring is carried out on the touch sense of the tail end of the finger, the working performance is stable, the integrity is high, and the application potential in real-time monitoring of the force position of a soft mechanical arm is huge.

The invention discloses an unmanned aerial vehicle hanging heavy load mechanical ground wire installation device, and belongs to the technical field of unmanned aerial vehicle application, the unmanned aerial vehicle hanging heavy load mechanical ground wire installation device comprises an unmanned aerial vehicle and a rope, the rope is connected below the unmanned aerial vehicle, a lifting hook is installed below the rope, a battery is arranged in the unmanned aerial vehicle, and a supporting frame is installed at the bottom of the unmanned aerial vehicle. According to the invention, by combining the unmanned aerial vehicle and the mechanical device, the installation time of the grounding wire is greatly shortened, and the installation can be completed within 40 minutes generally, so that the working efficiency is improved. The number of required operators is reduced, the labor cost is reduced, the physical output of the operators is reduced, and fatigue and potential accidents caused by too long working time are avoided. The device is suitable for ground wire installation in various complex environments, is not influenced by electromagnetic interference and distance, and has a wide application range and strong practicability.

The application discloses a FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine and a three-dimensional force measuring method, and the sensor comprises a fingertip, an elastic body, a fixed finger sleeve and a plurality of optical fibers; the fingertip is a force collector of the FBG type wearable fingertip three-dimensional force sensor for traditional Chinese medicine; the first end of the elastic body is connected with the fingertip, receives the force transmitted by the fingertip and generates deformation; the second end of the elastic body is connected with the fixed finger sleeve and is used for wearing on a finger; the plurality of optical fibers are uniformly arranged on the elastic body and generate deformation in X, Y and Z directions under the deformation of the elastic body, so that the three-dimensional force of the fingertip is obtained. The sensor adopts the FBG, no current passes through the optical fiber, and no electrical connection is needed; the force sensing system is not disturbed by electric noise and electromagnetic interference; the sensing element has small size and light weight, high precision, zero drift, wide frequency response and good high-temperature performance.

The invention relates to the technical field of optical fiber sensing, and discloses an optical fiber three-dimensional force sensor and a preparation method and application thereof. According to the optical fiber three-dimensional force sensor, the end face of the optical fiber and the polygonal hollow reflection micro-cavity on the end face are used as the two reflection faces of the Fabry-Perot cavity, and the multiple optical fiber sensors are arranged around the positioning hole in the circumferential direction; the load in the vertical direction and the load in the horizontal direction can cause the displacement change of different optical fiber sensors, the displacement change of two reflecting surfaces and the movement of a Fabry-Perot interference peak, and the force and displacement of a single optical fiber sensor are detected after demodulation, so that the real-time monitoring of the three-dimensional force is realized. The optical fiber three-dimensional force sensor provided by the invention can realize wide-range detection, is small in probe size, compact in structure, high in preparation efficiency, low in preparation cost, easy in mass production, free from electromagnetic interference and relatively high in sensitivity, and can be used for detecting various micro force-displacement.

The invention provides a vector magnetic field optical fiber measuring device and a transformer. A light source of the device is connected with the input end of a polarizer; the output end of the polarizer is connected with the input end of the magnetic field sensor; the output end of the magnetic field sensor is connected with the input end of the beam splitter; the first output end of the beam splitter is connected with the first balance photoelectric detector; the second output end of the beam splitter is connected with the input end of the polarization analyzer; the polarization analyzer is connected with the second balance photoelectric detector; the first balance photoelectric detector and the second balance photoelectric detector are both connected with the data processing device; the magnetic field sensor comprises a magneto-optical crystal; the magnetic field sensor is used for decomposing the first linearly polarized light output by the polarizer into two beams of second linearly polarized light through the magneto-optical crystal and outputting all or part of the two beams of second linearly polarized light to the beam splitter. Vector measurement of the leakage magnetic field of the transformer winding can be realized.

The invention provides a patch type piezoelectric driving two-degree-of-freedom mechanical arm and a driving method thereof. The mechanical arm comprises a plurality of unit arm sections connected in sequence and connecting assemblies between the arm sections. During working, driving signals with pi / 2 phase differences are applied to the piezoelectric vibrators on the unit arm sections, so that the points, making contact with the adjacent piezoelectric vibrators, of the piezoelectric vibrators generate micro-amplitude elliptical motion, and driving force is generated through the friction effect; the rotation of the unit arm sections around the piezoelectric vibrators of the adjacent unit arm sections and the rotation of the unit arm sections around the axes of the piezoelectric vibrators of the unit arm sections can be realized respectively, and the two-degree-of-freedom rotation of the two arm sections in two orthogonal planes can be realized due to the fact that the unit arm sections and the adjacent unit arm sections are spatially orthogonal. The mechanical arm is easy to seal, microminiaturization is achieved, electromagnetic interference is avoided, self-locking can be achieved in the power failure process, modal coupling frequency consistency adjustment of different phase modals is not needed, and the limitation on the design size, shape and the like of the mechanical arm is reduced.

A pulse electromagnetic protection circuit that simulates biological evolution is composed of an adder, an inverter, a signal node, a follower and other circuits, which constitute a signal node set with the amplification factor of the adder and the follower. The operation of the biological evolution circuit is that each signal node can survive only when the state is greater than 0, otherwise it will become extinct. The follower is composed of a resistor and an ideal operational amplifier, the inverting amplifier is composed of a resistor and an ideal operational amplifier, and the adder is composed of a resistor, an amplifier, and a diode. The function of the diode is to realize the positive state of the signal node to ensure the survival of the circuit. The benefits of this circuit are that (1) when there is strong environmental pulse electromagnetic field interference, the circuit can protect the circuit from electromagnetic interference and work normally; (2) the circuit is simple, convenient, inexpensive, adaptive, and easy to implement.

The invention provides an ultra-wide-angle free-form surface catadioptric image space telecentric lens, a design method thereof and an imaging system, which are used for solving the technical problem that an existing ultra-wide-angle lens is generally a transmission-type lens and is difficult to observe plasmas in an environment with a relatively large temperature difference. According to the ultra-wide-angle free-form surface catadioptric image space telecentric lens, the high-temperature environment during observation of plasmas in a Tokamak device is fully considered, the reflection light path is innovatively added, the lens is divided into the aperture diaphragm, the reflection light path and the transmission light path, the aperture diaphragm and the reflection light path are made of metal materials, and the transmission light path is made of metal materials. The device is arranged in a high-temperature vacuum chamber between a first observation window and a second observation window of a Tokamak device, and each lens in a transmission light path is made of a traditional lens material and is arranged in an external room-temperature environment. The whole ultra-wide-angle free-form surface catadioptric image space telecentric lens can stably observe plasma when the Tokamak device works.

The invention discloses a multi-channel information fusion relay protection closed loop automatic test system and method, and the system comprises a relay protection tester, a merging unit connected with the relay protection tester, and a relay protection device connected with the merging unit. The test control terminal performs signal transmission with the relay protection tester and is used for completing relay protection closed-loop automatic test, the relay protection device is connected and communicated with the test control terminal, an optical fiber communication module is arranged in the relay protection device, and the relay protection device is connected with a test module of the relay protection tester through an optical fiber. A wireless communication module is integrated in the relay protection tester. According to the method, the universality is high, the protection regular checking efficiency is improved, the real-time performance is better, the safety of test data is better, the effectiveness, quickness, sensitivity and selectivity indexes of the relay protection device can be accurately and effectively analyzed and judged, and technical support is provided for relay protection work.

The application relates to a signal transmission method between a fire telephone main machine and a fire telephone extension and a fire telephone system, wherein a near-end optical transmission device is connected with the fire telephone main machine, a far-end optical transmission device is connected with the fire telephone extension, the near-end optical transmission device is connected with the far-end optical transmission device through an optical fiber; an electric signal of analog audio data on a first fire telephone bus is converted into an optical signal by the near-end optical transmission device, and the converted optical signal is transmitted through the optical fiber; the signal transmission method between the fire telephone main machine and the fire telephone extension and the fire telephone are ingeniously designed; the converted optical signal is transmitted through the optical fiber; the optical fiber has the advantages of low loss, high bandwidth, strong anti-electromagnetic interference capability and the like; the transmission distance of general optical signals can reach at least 20 kilometers; during the transmission process, the optical fiber is not conductive, is not interfered by electromagnetic waves, is less affected by resistance and voltage, and the stable transmission of signals in a complex electromagnetic environment is ensured.

The invention provides a vehicle electrical equipment arrangement electromagnetic compatibility checking method and system and a storage medium, and the method comprises the following steps: recognizing the relative position between vehicle electrical equipment and the electromagnetic compatibility characteristics and types of the vehicle electrical equipment; determining the arrangement principle of the surrounding vehicle electrical equipment according to the electromagnetic compatibility characteristic and type of each vehicle electrical equipment; according to the principle of movement minimization, the positions of the vehicle electrical devices around each vehicle electrical device are adjusted, so that all the vehicle electrical devices meet the corresponding arrangement principle. According to the method, the electromagnetic compatibility interference problem possibly occurring in the arrangement of the electrical equipment can be identified in the design stage, the electromagnetic compatibility performance of the whole vehicle is optimized, and the cost and development period prolonging caused by problems occurring after subsequent vehicle loading are avoided.

The utility model relates to the technical field of electric energy meters, in particular to an electric energy meter. The electric energy meter comprises a housing in which at least one group of current transformer assembly is arranged; and the anti-magnetic iron plates are respectively arranged on the opposite inner side walls of the shell. According to the electric energy meter, the anti-magnetic iron plates are arranged on the opposite inner side walls in the shell and can block electromagnetism, so that it is guaranteed that other electric devices in the shell are free of electromagnetic interference, display errors of the electric energy meter are prevented, it is avoided that strong magnetic shielding covers are installed on all the electric devices, the size of the electric energy meter is effectively reduced, cost is reduced, and practicability is improved.

The utility model is suitable for the technical field of electric meter circuits, and relates to a low-power standby circuit of an external circuit breaker of an electric energy meter, which comprises an electromagnetic compatibility and rectification circuit, a linear step-down power supply circuit, a bus switch circuit, a DC / DC power supply circuit, a voltage-stabilized power supply circuit and an MCU control circuit. The electromagnetic compatibility and rectification circuit is respectively in communication connection with the linear step-down power supply circuit and the bus switch circuit, the bus switch circuit is further respectively in communication connection with the DC / DC power supply circuit and the MCU control circuit, the linear step-down power supply circuit, the voltage-stabilized power supply circuit and the MCU control circuit are sequentially in communication connection, and the DC / DC power supply circuit is further in communication connection with the voltage-stabilized power supply circuit. The external circuit breaker is simple in structure, powerful in function, small in occupied space and low in cost while low-power-consumption standby of the external circuit breaker circuit of the electric energy meter is achieved.

The invention relates to a railway tunnel insulation tubular bus device based on online monitoring, a use method and application thereof, the railway tunnel insulation tubular bus device comprises an insulation tubular bus body connected with a power supply power grid, and a temperature measurement sensing assembly arranged on the insulation tubular bus body, through the insulation tubular bus body, electric power transmission in a railway tunnel is realized, and the temperature measurement sensing assembly is arranged on the insulation tubular bus body. Through the temperature measurement sensing assembly, the insulation tubular bus body picks up a temperature signal in an electric power transmission state, electric power supply in a railway tunnel in an on-line signal monitoring state is realized, and the technical problem that electric power is supplied in the railway tunnel by directly using a cable is solved. Therefore, reliable power supply can be realized in a middle railway tunnel in which a large long tunnel accounts for more than 90%.

This utility model discloses a drone countermeasure terminal and charging control circuit, including a charging management chip, a filtering circuit, and an interlocking circuit. The filtering circuit is disposed at the input terminal of the charging management chip and includes a common-mode inductor, a first filtering capacitor, and a second filtering capacitor. The common-mode inductor is connected in series with the input terminal of the charging management chip, and the first filtering capacitor is connected in parallel with the input and output terminals of the common-mode inductor. The interlocking circuit is connected to the input terminal of the charging management chip and is used to disconnect the input power supply of the charging management chip when the countermeasure unit is activated. Therefore, the interlocking circuit can automatically cut off battery charging when performing drone countermeasures, thereby protecting battery safety. Furthermore, the filtering circuit can effectively filter electromagnetic interference, further ensuring that the battery charging input is not affected by electromagnetic interference generated during countermeasures.

The invention discloses a packaging method for realizing an electromagnetic shielding function of a GaAs chip and the GaAs chip, and belongs to the technical field of semiconductor packaging. Comprising a packaging substrate, and the packaging substrate comprises a device region formed by a plurality of GaAs tube cores and a frame peripheral region surrounding the device region; the first electromagnetic shielding layer is formed on the side surface of the GaAs tube core; the second electromagnetic shielding layer is formed in the peripheral region of the frame; and the third electromagnetic shielding layer is positioned on the surface of the GaAs tube core and is electrically connected with the first electromagnetic shielding layer and the second electromagnetic shielding layer in a grounding manner. The first electromagnetic shielding layer, the second electromagnetic shielding layer and the third electromagnetic shielding layer are electrically connected to form a full-surrounding electromagnetic shielding structure on the peripheral side and the upper surface of the GaAs chip, so that the electromagnetic shielding effect of the GaAs chip is greatly improved, and the electromagnetic-sensitive GaAs chip is effectively protected.

The utility model provides a double-optical-fiber diaphragm type optical fiber pressure sensor. The pressure sensor structure comprises a base, an input optical fiber, an output optical fiber, a double-optical-fiber assembly and a cover plate. A pressure sensing diaphragm is arranged in the cavity of the base; the double-optical-fiber assembly comprises a sensing arm optical fiber, a reference arm optical fiber and a photoelectric element, the sensing arm optical fiber and the reference arm optical fiber are respectively sleeved with a protective sleeve, the sensing arm optical fiber and the reference arm optical fiber are respectively fixed in the positive strain area and the negative strain area of the pressure sensing diaphragm, and the two ends of each optical fiber extend out of the protective sleeve. The light source is connected with a photoelectric element to form a Michelson interference structure or a Mach-Zehnder interference structure; the input end and the output end of the double-optical-fiber assembly are connected with the input optical fiber and the output optical fiber through photoelectric elements respectively. The device is simple and reliable in structure and free of electromagnetic interference, high-precision dynamic pressure measurement can be achieved based on an interference phase demodulation method, and the requirement for monitoring extremely-small pressure fluctuation in a large-pressure environment can be effectively met.

The present application discloses a link structure and a mobile terminal for improving the wired transmission distance of a secure real-time bus, including: a first host, a second host, a first transmission structure, and a second transmission structure; the first host and the first transmission structure transmit data through an SRB bus, the first transmission structure is used to convert the data received from the first host into a format suitable for transmission on a single-mode optical fiber, the first transmission structure and the second transmission structure transmit data through a single-mode optical fiber, and the second transmission structure is used to convert the data transmitted from the single-mode optical fiber into a format recognizable by the SRB bus, and transmit the data to the second host through the SRB bus. The problem of electromagnetic interference is solved by optical fiber transmission. Optical fiber transmission signals are carried out in the form of light and are not affected by electromagnetic fields. In addition, optical fiber transmission can improve the data transmission performance and stability of the entire link structure and meet the needs of more application scenarios.

The utility model relates to the technical field of automobile manufacturing, specifically relates to a new energy automobile high -voltage cable electromagnetic shielding joint, including joint main part, force nut and shielding ring connection structure, shielding ring connection structure is coaxially built -in in joint main part in detachable mode, and is same time with high -voltage cable's metal shielding layer, joint main part and force nut form electrically conductive communication, force nut and joint main part between realize axial locking through screw pair, shielding ring connection structure includes cap pressure -welding ring, boss washer and annular metal wire net shielding gasket, cap pressure -welding ring is installed on high -voltage cable's metal shielding layer outer surface and is pressure -welding fixed, boss washer is coaxially attached to the axial end surface of cap pressure -welding ring, metal wire net shielding gasket is set up in annular step at the outer periphery of boss washer, and under the axial pressure effect of force nut, is elastically compressed between cap pressure -welding ring and boss washer, can complete mechanical fixation, waterproof sealing and double electromagnetic shielding simultaneously.

The invention discloses a four-footed planar three-degree-of-freedom piezoelectric robot and a motion excitation method thereof, and relates to the technical field of piezoelectric robots. The problem that a small mobile robot constructed by an electromagnetic driving device is difficult to have multi-degree-of-freedom high-precision motion is solved. The piezoelectric robot comprises four vertical piezoelectric legs and four horizontal piezoelectric beams; the vertical piezoelectric legs comprise a first vertical piezoelectric leg, a second vertical piezoelectric leg, a third vertical piezoelectric leg and a fourth vertical piezoelectric leg; the horizontal piezoelectric beams comprise a first horizontal piezoelectric beam, a second horizontal piezoelectric beam, a third horizontal piezoelectric beam and a fourth horizontal piezoelectric beam; the four vertical piezoelectric legs are arranged according to a space axial parallel relation; the four horizontal piezoelectric beams are located in the same plane and distributed in a square shape. The first vertical piezoelectric leg, the second vertical piezoelectric leg, the third vertical piezoelectric leg and the fourth vertical piezoelectric leg are arranged at four end points of the square structure. The method is applied to the fields of micro-nano assembly, precise positioning, micro-control and the like.

The utility model relates to the field of medical instruments, and provides a flexible endoscope front end refined fiber grating multi-dimensional force sensing system which comprises a snake bone, a cavity penetrating through the front end and the tail end of the snake bone is formed, and at least part of the side wall of the snake bone is provided with an elastic body. The endoscope tip is connected to the front end of the snake bone; the fiber bragg grating measuring assembly comprises a plurality of fiber bragg gratings, all the fiber bragg gratings are arranged in the cavity, one end of each fiber bragg grating is connected with the endoscope tip, the other end of each fiber bragg grating is connected with the snake bone, and the fiber bragg gratings abut against the elastic body; and the upper computer is connected with the fiber bragg grating. The system provided by the utility model has the characteristics of compact volume, electromagnetic interference resistance, excellent biocompatibility and the like, and the sensing end does not need to be provided with a circuit, so that the biocompatibility is improved. In the operation process of the endoscope, the system avoids the phenomenon of electric conduction or electric leakage, and the safety of instruments is enhanced. In addition, the size of the fiber bragg grating is small, further miniaturization of the front end of the endoscope is facilitated, and operation safety is improved.