168 results about "Transmission medium" patented technology

This invention provides an electromagnetic field detector, a system comprising the electromagnetic field detector, and a method of operating an electromagnetic field detector, the electromagnetic field detector comprising a first optical signal interface configured to receive, from one or more remote optical sources, a first optical signal; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated from the first optical signal, the electromagnetic field transmitter comprising: a photocurrent generator configured to generate a photocurrent from the first optical signal; and an antenna interface configured to supply the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive, from the one or more remote optical sources, a probe optical signal and a coupling optical signal; and a transmission medium configured to be excited by the probe optical signal and further excited by the coupling optical signal, wherein the probe optical

This invention provides an electromagnetic field detector, a system comprising the electromagnetic field detector, and a method of operating an electromagnetic field detector, the electromagnetic field detector comprising a first optical signal interface configured to receive, from one or more remote optical sources, a first optical signal; an electromagnetic field transmitter configured to transmit a local oscillator electromagnetic field generated from the first optical signal, the electromagnetic field transmitter comprising: a photocurrent generator configured to generate a photocurrent from the first optical signal; and an antenna interface configured to supply the photocurrent to an antenna to transmit the local oscillator electromagnetic field; a second optical signal interface configured to receive, from the one or more remote optical sources, a probe optical signal and a coupling optical signal; and a transmission medium configured to be excited by the probe optical signal and further excited by the coupling optical signal, wherein the probe optical signal has a probe frequency set to excite electrons of the transmission medium to a first excited state and the coupling optical signal has a coupling frequency set to excite electrons of the transmission medium to a predetermined Rydberg state so as to induce an Electromagnetic Induced Transparency, EIT, effect, wherein the transmission medium is further configured to receive a phase-modulated electromagnetic field from a remote transmitter and the local oscillator electromagnetic field such that the combination of the phase-modulated electromagnetic field and the local oscillator electromagnetic field causes a change in the probe optical signal from which a phase state of the phase-modulated electromagnetic field can be detected.

The invention discloses a composite multi-frequency marine ultrasonic anti-fouling system and method, relates to the technical field of marine anti-fouling, and aims to change a single-frequency or simple-pulse ultrasonic transmitting mode, transmit composite multi-frequency ultrasonic waves in a wide frequency band, and superpose the ultrasonic waves of multiple frequencies in a transmission medium to generate a cavitation effect so as to achieve the anti-fouling effect. The method is used for avoiding the tolerance of marine organisms, improving the anti-adhesion efficiency and enhancing the effect of a specific area; the wave generating frequency and the working frequency are dynamically adjusted according to the running state and the environment condition of the ship, the energy consumption and the biological adhesion rate of the ship are reduced, and the relation among the biological adhesion rate, low energy consumption and the environment protection requirement is balanced.

The invention provides a well drilling anti-interference communication system based on a VCSEL (Vertical Cavity Surface Emitting Laser), the VCSEL and a manufacturing method thereof, and the manufacturing method comprises the following steps: calculating the light field intensity distribution of a high-order transverse mode through an intrinsic mode expansion method and a Laguerre-Gaussian model based on the epitaxial structure parameters of a laser; determining a target area which begins to perform downward annular etching on the surface of the p-DBR layer, wherein the target area coincides with a light field intensity peak area of the high-order transverse mode; performing annular etching in the target area to form an annular groove, and etching at least seven pairs of p-DBR layers inwards in the groove; the communication system comprises a signal transmitting end arranged on the derrick side, and the signal transmitting end is provided with the vertical cavity surface emitting laser; the p-DBR region of the vertical cavity surface emitting laser is provided with an annular etching structure; the graded-index fluorinated plastic optical fiber is used as a transmission medium and is connected with the derrick side and the logging room side; and the optical signal receiving end is arranged at the logging room side and is used for receiving and converting the optical signal into an electric signal.

Circuits for reflection cancellation in single-ended signaling are disclosed. A transmission circuit includes a control circuit configured to receive a plurality of input signals that include a plurality of symbols having at least one bit and a data driver circuit configured to generate a particular signal on a transmission medium using a particular symbol of the plurality of symbols. The transmission circuit further includes a reflection cancellation circuit configured to, after a generation of the particular signal, generate a reflection cancellation signal on the transmission medium using an inverted value of a different symbol of the plurality of symbols received prior to the particular symbol. A first composite of the particular signal and the cancellation signal is readable at a load as a value of the particular symbol, wherein the load is configured to receive a transmitted signal via the transmission medium.

The invention belongs to the technical field of long-wave communication and electronic information, and discloses a cross-medium communication system based on a magnetoelectric mechanical antenna, which comprises the magnetoelectric mechanical antenna, a receiving coil, a transmission medium container, a signal generator, a power amplifier and a static bias magnetic field applying device, the magnetoelectric mechanical antenna is arranged on a support of the static bias magnetic field applying device, the receiving coil is arranged in the transmission medium container, and the main vibration direction of the receiving coil and the main vibration direction of the magnetoelectric mechanical antenna are coaxial; the signal generator is connected with the power amplifier in series, the power amplifier is connected with a lead-out wire of a piezoelectric layer of the magnetoelectric mechanical antenna, and the signal generator provides an excitation signal for the piezoelectric layer of the magnetoelectric mechanical antenna through the power amplifier; and the digital oscilloscope is connected with the port of the receiving coil and is used for collecting electromagnetic wave signals which are captured by the receiving coil and are transmitted by the magnetoelectric mechanical antenna. The cross-medium communication system provided by the invention can realize effective and stable transmission of information among different media.

Circuits for reflection cancellation in single-ended signaling are disclosed. A transmission circuit includes a control circuit configured to receive a plurality of input signals that include a plurality of symbols having at least one bit and a data driver circuit configured to generate a particular signal on a transmission medium using a particular symbol of the plurality of symbols. The transmission circuit further includes a reflection cancellation circuit configured to, after a generation of the particular signal, generate a reflection cancellation signal on the transmission medium using an inverted value of a different symbol of the plurality of symbols received prior to the particular symbol. A first composite of the particular signal and the cancellation signal is readable at a load as a value of the particular symbol, wherein the load is configured to receive a transmitted signal via the transmission medium.

The invention provides an industrial equipment predictive maintenance method based on the Internet of Things, and the method comprises the steps: monitoring the operation data of each equipment of an industrial system in real time, carrying out the standardization processing of the data, obtaining a multi-source monitoring data set, and recording the connection layout, electrical circuit distribution and mechanical transmission structure relation between the equipment; if a certain equipment node in the preliminary propagation network abnormally fluctuates on a transmission medium or a transmission path, analyzing a potential propagation path of a node fault through historical monitoring data, a process interruption range and a control signal transmission path; and analyzing the real-time operation load and the historical fault record of the related equipment of the fault propagation potential path, calculating the fault occurrence probability of each equipment node under the sharing of the environmental conditions, and obtaining a fault risk distribution diagram of the whole system.

This invention relates to the field of optical fiber communication technology, and more particularly to a method and system for improving the signal quality of optical fiber communication based on adaptive compensation. The method performs joint time-domain and frequency-domain analysis on the optical signal to be processed, extracts distortion characteristic parameters, and maps them to a set of compensation coefficients to construct a compensation function for inverse signal compensation. By evaluating the quality of the compensated signal and comparing it with a preset benchmark, the mapping rules of the compensation coefficients are dynamically adjusted, achieving adaptive and precise compensation for the nonlinearity and dispersion effects of the transmission medium, effectively improving signal quality and system performance.

The present invention provides a wireless remote control for an in-vehicle panoramic parking system, comprising a housing and a circuit board; the circuit board is embedded within the housing; the circuit board further comprises a control circuit and a wireless communication circuit; the wireless communication circuit utilizes radio electromagnetic waves as a transmission medium; the housing is detachable into a control panel and a bottom housing; the control panel is provided with control keys correspondingly connected to the control circuits on the circuit board; and the bottom housing comprises a connection portion for mounting on a vehicle. The present invention provides an in-vehicle panoramic parking system and a wireless remote control thereof, utilizing radio electromagnetic waves as a transmission medium to facilitate control of the in-vehicle panoramic parking system host.

According to the high-speed railway subgrade settlement distributed monitoring method and system, the high-speed railway subgrade settlement distributed monitoring method has the advantages that the technology is mature, the precision is high (millimeter level), layered settlement of different soil layers can be measured, data are visual and reliable, and the precision is extremely high (can reach 0.1 mm level); the optical fiber is a sensor and a transmission medium and can continuously sense deformation of any point along an optical fiber path, the spatial resolution can reach the meter level or even the centimeter level, the anti-interference performance is high, the corrosion resistance and the electromagnetic interference resistance are achieved, the long-term stability is good, and the real distribution is achieved; the method is suitable for long-term monitoring, can realize multi-parameter monitoring (combining with different demodulation technologies and simultaneously monitoring settlement, strain, temperature and the like), and the monitoring system has full-time-domain continuity: 7 * 24-hour uninterrupted monitoring, which is far better than the frequency and full-space distribution of traditional manual inspection.

A wireless communications system includes a network of acoustic modems for communicating messages between downhole equipment and a surface control and telemetry system. The acoustic modems include multi-channel acoustic receivers that are uniquely deployed along an acoustic transmission medium to provide spatial diversity. Acoustic signals received on the multiple receiver channels are combined and filtered using a Bayesian-type filter to reduce noise.

The application belongs to the technical field of wavelength measurement, and is especially a high-resolution speckle wavelength measurement device and method. The device comprises a shell, a first optical fiber incident port and a second optical fiber incident port are arranged on the outer wall of the shell, an optical switch, a light splitting coupler, a calibration light source and a test light path are arranged in the shell, and the test light path is composed of a multimode optical fiber, an optical fiber mode enhancement device and a surface array detector. The application enhances the coupling and phase delay between different modes by applying mechanical disturbance to the scattering medium, increases the number of excited modes, and solves the problems that the resolution of the speckle wavelength meter is limited by the light path length of the transmission medium and the insufficient information density of the speckle per unit area. The method can improve the wavelength resolution, and effectively improve the sampling speed of the speckle wavelength meter by reducing the size of the photosensitive camera target surface.

The invention discloses an all-fiber integrated detection ablation diagnosis and treatment instrument and a preparation method, and belongs to the field of fiber ultrasonic sensors and laser ablation devices. Comprising a double-clad optical fiber, a dielectric film, a sensing cavity and a micro-focusing cone. The double-clad optical fiber is used for transmission of probe light and ablation laser, the dielectric film and the sensing cavity jointly form a Fabry-Perot (FP) cavity to sense ultrasonic signals, and the micro-focusing cone provides an ultrasonic focusing effect. The problems that an existing optical fiber detection ablation device depends on multiple fibers and is complex in structure are solved, and the problems that an existing hollow cantilever structure optical fiber ultrasonic sensor is low in sensitivity and low in frequency band are solved.

In the optical transmission medium measurement method, the optical transmission medium is subjected to a plurality of light inputs having different characteristics and equal center wavelengths, and measured values of intensity spectra of a plurality of light outputs from the optical transmission medium corresponding to the plurality of light inputs, respectively, are obtained. The nonlinear coefficient and the wavelength dispersion value are varied and an error between a calculated value of an intensity spectrum calculated based on an intensity spectrum and a phase spectrum of each of the plurality of light inputs, the nonlinear coefficient and the wavelength dispersion value of the optical transmission medium, and a measured value of an intensity spectrum of each of the plurality of light outputs is calculated. Then, a difference between the plurality of light inputs due to the difference in characteristics based on a relationship between the nonlinear coefficient and the wavelength dispersion value and the error is determined. Thus, a measurement method of obtaining the nonlinear coefficient and the wavelength dispersion value of the optical transmission medium with high accuracy is realized.

The application is suitable for the technical field of laser radar, and provides a laser radar, which comprises a light source, a transmitting module, a receiving module, a transmission module, a detecting module and a signal processing module; the transmission module comprises a first coupler and a plurality of transmission media, wherein the local oscillator beam is transmitted to at least one transmission medium for delay processing through the first coupler, and the delay amount of the at least one transmission medium is different from that of the other transmission media; the detecting module is connected with the transmission module and the receiving module respectively, is used for receiving the echo signal and the delayed local oscillator beam output by the transmission module, performing beat frequency processing on the echo signal and the delayed local oscillator beam to obtain a beat frequency signal, and converting the beat frequency signal into a detecting electric signal; and the signal processing module is electrically connected with the detecting module, is used for determining a to-be-measured object according to the detecting electric signal. The laser radar provided by the application can improve the strength of the detection signal in long-distance measurement.

The application discloses a kind of electric transducer deep water working implementation methods, by electric transducer, pressure balancing device, gas-electric hybrid umbilical cable Deepwater electric transducer sound simulator system is formed, when working, electric transducer cooperates with pressure balancing device to realize the complete balance of internal and external pressure of electric transducer, gas-electric hybrid umbilical cable is the transmission medium of gas-electric signal;Deepwater electric transducer sound simulator system before working sets the pressure difference upper and lower limit value of pressure balancing device to carry out pressure charging and pressure releasing operation;Electric transducer is by exciter, radiating cover plate, shell, decoupling sealing ring, balance rubber capsule is formed, and internal air pressure sensor and external water pressure sensor are installed on the electric transducer.The application cooperates with pressure balancing device and balance rubber capsule, and working water depth can reach the pressure limit of rubber capsule material itself, can realize the complete balance of internal and external pressure of electric transducer under deep water condition, improves the working water depth of electric transducer, with wide use prospect.

The invention relates to a photonic radar system (100) and a method for operating a photonic radar system (100) with monitoring of the transmission properties, wherein the photonic radar system (100) comprises a central station (200) and at least one radar head device (300, 300-n) designed as a transmitter and / or receiver module, which is connected to at least one individual optical transmission medium (400, 400-n), wherein signals exchanged for environmental detection are modulated onto at least one optical carrier signal generated by the central station, wherein the method comprises the steps: Generating a test signal with at least one monotonically changing frequency ramp, preferably constant, Generating a reference signal corresponding to the test signal, Coupling the test signal into the at least one transmission medium (400, 400-n), Extracting a back-transmitted test signal component to a detection unit (630), and either optical superimposition of the transmitted test signal with the reference signal of the test signal to form an optical difference signal and Capturing the differential signal or Alternatively, the retransmitted test signal can be captured and electronically superimposed on the captured retransmitted test signal with the reference signal to generate the difference signal and generate an OFDR spectrum (920) based on the difference signal, as well as determine parameters of at least the structures of the OFDR spectrum (920) correlated with the radar head devices (300, 300-n) and store the parameters as calibration information in a memory (670) and / or output the calibration information.

The utility model relates to a high-performance temperature sensor. Comprising a signal transmission pipeline, a signal acquisition structure 2, a signal transmission structure, a protective cover plate structure and a combined module, wherein the signal acquisition structure comprises an RTD (Resistance Temperature Detector), a thermistor and a thermocouple; the RTD detects the temperature by measuring the characteristic that the resistor changes along with the temperature, and has high precision and stability. The thermistor is based on the principle that the resistance changes along with the temperature, and is usually used in a lower temperature range. The thermocouple measures the temperature through the voltage difference generated between different metal contacts, and is suitable for a wider temperature range. And the part of the signal transmission pipeline is fixedly connected with the signal acquisition structure and is used for transmitting a signal from the interior of the sensor to an external system. Transmission media such as a cable or a wire are arranged inside and used for converting temperature changes into electric signals to be output.

The invention discloses a radiation dose measuring device and method, the device comprises a foil, an ultrasonic pulse receiver and a signal collector, and a liquid transmission medium is filled between the foil and the ultrasonic pulse receiver; the foil is used for receiving radiation and generating ultrasonic waves, and the ultrasonic waves are transmitted to the ultrasonic pulse receiver through the liquid transmission medium; the ultrasonic pulse receiver is used for detecting ultrasonic waves and transmitting detected waveforms to the signal collector, and the signal collector is used for reading the amplitude of the ultrasonic waves and converting the amplitude into the radiation dose according to the relation between the amplitude and the radiation dose. The device and the method disclosed by the invention can realize real-time measurement of radiation dose, especially high dose rate.

The application provides a signal communication and encryption integrated processing method, a sending device, a receiving device and a system, and relates to the technical field of quantum communication. The method comprises the following steps: a synchronization signal generation module generates a synchronization signal; a synchronization signal modulation module receives a communication signal, and performs pulse modulation on the synchronization signal according to the communication signal, so as to encode classical communication information carried by the communication signal into the synchronization signal, and obtain a modulated synchronization signal; a quantum signal generation module generates a quantum signal according to a signal parameter of the modulated synchronization signal; a wave combiner performs wave combining processing on the quantum signal and the modulated synchronization signal, and obtains a mixed signal; and the mixed signal is sent to a receiving device through a single transmission medium. According to the application, the classical communication information is encoded into the synchronization signal, and the synchronization signal is co-fiber transmitted with the quantum signal on a single optical fiber, so that the problem that the optical fiber resource is insufficient and the security of the communication and encryption integrated system is difficult to be considered is effectively solved.

An electrical connector is attached to a wiring substrate and mated with a counterpart connector connected to a signal transmission medium. A shell of the electrical connector has a pair of wall parts that contact a ground member on the counterpart connector. One wall part distant from the signal transmission medium includes a first side plate that has one end attached to a ground conductive path of the wiring substrate and extends in a direction away from the wiring substrate, a joining part that has one end joined to another end of the first side plate, and a second side plate that has one end joined to another end of the joining part and extends in a direction closer to the wiring substrate. The second side plate has a contact piece that extends in a direction away from the wiring substrate and elastically contacts the ground member.

The utility model discloses an extensible double-ring information system, which comprises a first link, a second link and a server, the first link comprises a first monitor, the second link comprises a second monitor, the tail end of the first monitor in the first link is provided with a plurality of first monitors, and the tail end of the second monitor is provided with a plurality of second monitors. A plurality of second monitors are arranged at the tail ends of the second monitors in the second link, the first link and the second link form a double-ring layout, a setting and reporting mechanism of the wireless local area devices is provided, and the problems of high complexity and high cost during arrangement and repair of wired devices are solved. The wireless device does not need cables such as optical fibers or copper wires as signal transmission media, and only needs power lines. Since most devices are internally provided with power supply allocation circuits, the reasonable power supply voltage drop or voltage fluctuation of the power line still belongs to an acceptable range, and the adaptation of the wireless device is greatly improved.

In some embodiments, an all-optical Coherent Ising Machine (CIM) may be provided. The all optical CIM may include a fiber optics component configured to enable a frequency domain multiplexing by providing a transmission medium for a plurality of comb lines of a frequency comb mapped into a spin vector; a free space optics component configured to enable a spatial domain multiplexing by spatially separating the plurality of comb lines of the frequency comb; and a spatial light modulator configured to encode a spin-spin interaction matrix and allowing for a vector matrix multiplication, in an optical domain, of the spatially separated plurality of comb lines mapped to the spin vector and the spin-spin interaction matrix, wherein the result of the vector matrix multiplication provides a linear feedback to solve an Ising problem.

The invention relates to a coaxial microwave sensor for liquid complex dielectric constant measurement. The coaxial microwave sensor comprises a cylindrical metal conductor, a transmission medium wrapping the cylindrical metal conductor and a defect conductor arranged on the outer surface of the transmission medium. The winding structure is adopted as a defect conductor sensing structure and used for detecting the dielectric property of the material to be detected, and different from a traditional coaxial dielectric sensor designed through a reflection method, the novel method reconstructs field distribution by actively etching the defect structure on the outer conductor of the coaxial structure. The axial sensitive area around the central axis of the coaxial structure is effectively utilized, and the interaction between the electromagnetic field and the to-be-detected material is remarkably enhanced, so that high-sensitivity detection of the dielectric property is realized.

An optical connector includes an optical waveguide device with a first optical port and a fastening structure. The optical waveguide device is able to implement splitting, combining, demultiplexing, multiplexing, multi core-single core conversion, filtering, reflection, spot size conversion, optical path connection / disconnection, optical path direction conversion, or optical power adjustment. The fastening structure is configured to fasten an optical transmission medium. The first optical port is aligned with and connected to the optical transmission medium in the fastening structure. In this application, the optical connector combines functions such as splitting, combining, demultiplexing, multiplexing, multi core-single core conversion, filtering, reflection, spot size conversion, optical path connection / disconnection, optical path direction conversion, or optical power adjustment with a connector function without changing a size of an existing connector, to reduce a size of an optical module and reduce a board area occupied by the optical module.

This invention claims protection for a systematic verification method that uses magnetic fields rather than electromagnetic waves as a communication channel. This method, pertaining to the field of communications technology, verifies the theory of magnetic induction communication from four perspectives: near-field electromagnetic wave theory, the transmission formula for magnetic induction communication, the relationship between the center frequency of electromagnetic waves and the optimal antenna length, and the impact of the properties of the transmission medium on communication. This method demonstrates from multiple perspectives that antennas with corresponding structures in magnetic induction communication theory transmit signals through magnetic induction rather than electromagnetic waves, thus avoiding the limitations and incompleteness of a single verification method.

The application discloses a kind of based on low-loss anti-resonance hollow waveguide broadband high-efficiency leaky-wave antenna design method and structure, its technical scheme includes: first based on anti-resonance principle design single dielectric wall hollow waveguide;Further introduce second dielectric wall optimization form double dielectric wall anti-resonance hollow waveguide, significantly enhance the transverse restraint to electromagnetic energy in air cavity by cascading reflection effect, realize super low loss transmission;Finally, etching periodic radiation slot in the upper layer metal plate of double dielectric wall hollow waveguide, construct leaky-wave antenna with frequency scanning function.The application uses air as main transmission medium, fundamentally reduces dielectric loss, so that the antenna has ultra-low transmission loss and ultra-high radiation efficiency in wide frequency band, while the structure is simple, process compatibility is strong, only through standard PCB process can be realized, can be widely used in 5G / 6G communication, millimeter wave radar, terahertz imaging and other high-performance wireless systems.

The invention relates to the technical field of wire and cable manufacturing, and aims to provide a high-performance digital signal cable for a high-speed rail, which sequentially comprises a cable core, a heat insulation layer, a protection repair layer, a reinforced composite shielding layer, a multiple high-flame-retardant protective layer, a high-shielding reinforced armor layer and a multiple high-flame-retardant outer sheath from inside to outside, wherein the protection repairing layer adopts a foaming belt structure with independent foam holes, the foam holes are filled with special signal transmission media, when the cable is impacted by external force or flattened, the transmission media can be released through a foam hole self-explosion mechanism, a signal transmission channel is automatically established or recovered, and the self-repairing function of the cable is achieved. Meanwhile, by adopting the large-section conductor design and combining the synergistic effect of the reinforced composite shielding layer and the high-shielding reinforced armor layer, the cable has the advantages of long-distance transmission capability, excellent shielding performance, excellent mechanical shock resistance and high-grade flame-retardant safety, and can meet the use requirements of high-speed railways in complex and severe environments.

The present application relates to a kind of arc detection circuit, specifically, it is related to arc current detection circuit based on comparison of current sensor.It includes signal acquisition circuit, transmission medium and signal comparison circuit, signal acquisition circuit includes arc signal acquisition circuit and signal filter circuit.In the present application, the current of two current transformers on a wire is compared to determine the size of arc current or the comparison signal of the current to determine whether the conductor is arcing, especially suitable for use in power distribution loop of power supply and distribution system, even in the case of larger load, load diversity, the arc situation between conductor wire and wire, wire and ground can be quickly and accurately detected, and by setting the number of arc fault current signals output in unit time reaches the set number, then the automatic counting alarm circuit outputs alarm signal, which can further avoid false alarm caused by detection error.