283 results about "Transmission medium" patented technology

Aspects of the subject disclosure may include, for example, a device including a detector configured to identify a narrow-band absorption occurring within a signal spectrum of an optical signal propagating through a gaseous medium, wherein the optical signal is configured to communicate digital information via an optical communication link including a transmitter, a receiver and an optical transport medium therebetween. The device further includes a mitigation controller configured to control a digital circuit to mitigate at least a portion of a vulnerability of the optical communication link, the vulnerability associated with the narrow-band absorption. Other embodiments are disclosed.

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.

The invention discloses a pipeline leakage monitor based on optical fiber interference and a monitoring method thereof, and belongs to the technical field of pipe network leakage monitoring. According to the invention, through the cooperation of the differential deformation of the outer cylinder and the inner cylinder and the air cavity, the two paths of sensing optical fibers are driven to generate reverse and equal-length length strain, and the improvement of the sensitivity of pipeline micro leakage sound pressure signal-optical phase signal conversion and the suppression of environmental common-mode noise are realized; a sound pressure signal generated in the leakage process of a pipeline is converted into phase change of light through a balanced optical fiber interferometer, a leakage signal is demodulated through a phase detection technology, and high-precision pickup of the tiny leakage sound pressure signal of the pipeline is achieved; the sound velocity is calibrated in real time through the temperature sensor and the sound velocity compensation module, and microsecond-level wireless signal time service is combined, so that the technical effects of large positioning error and difficulty in multi-device synchronous sampling caused by temperature drift of the sound velocity along with a transmission medium are solved.

The invention belongs to the technical field of coal mine shaft maintenance emergency communication, and particularly discloses a shaft maintenance communication device and method based on an electromagnetic coupling principle. The device comprises an elevator controller, a car room main controller, a signal transmission medium and two pairs of electromagnetic coupling coils. The elevator controller is arranged in an elevator cage, and the car room main controller is arranged in a ground winch control room; a pair of electromagnetic coupling coils is respectively arranged at the top of a skip bucket of the elevator and below a guide wheel through a lasso structure and is respectively used for sending and receiving signals. A closed-loop lifting link where a steel wire rope of the elevator is located is used as a signal transmission medium, and bidirectional long-distance transmission of signals is achieved between an elevator controller and a car room main controller based on the electromagnetic coupling communication principle. A maintainer can actively lock the hoister through the hoister controller, accidental starting of the hoister caused by misoperation of a winch control room is avoided, and after locking is released, a winch driver can be informed of starting and stopping the hoister through voice and dotting control signals.

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 relates to an arc discharge detection circuit, in particular to an arc discharge current detection circuit for comparison based on a current sensor. The circuit comprises a signal acquisition circuit, a transmission medium and a signal comparison circuit. The signal acquisition circuit comprises an arc discharge signal acquisition circuit and a signal filter circuit. According to the invention, the current collected by the two current transformers on one wire is compared and processed to obtain the size of the arc discharge current or the comparison signal of the current to judge whether the conductor is arced or not, so that the method is particularly suitable for being used in a power distribution loop of a power supply and distribution system, and even under the conditions of large load and load diversity, the arc discharge of the conductor is avoided. According to the utility model, the arc discharge condition between the conductor wires and between the wire and the ground can be rapidly and accurately detected, and the false alarm condition caused by the detection error can be further avoided by setting the mode that the number of times of outputting the arc discharge fault current signal in unit time reaches the set number of times and then outputting the alarm signal by the automatic counting alarm circuit.

The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device and method. The invention discloses an optical up-conversion, optical fiber transmission and self-interference elimination integrated device which comprises a central station, a transmission medium and a far-end base station. Wherein the central station comprises a first wavelength tunable laser (1), a local oscillator signal generator (2), a second wavelength tunable laser (3), a first double-parallel Mach-Zehnder modulator (4), an electric power divider (5), a second double-parallel Mach-Zehnder modulator (6), a 90-degree polarization rotator (7) and a polarization beam combiner (8). And a transmission medium adopts a single-mode optical fiber (9). The far-end base station comprises an optical power amplifier (10), a polarization beam splitter (11), a first photoelectric detector (12), a second photoelectric detector (13), an electric power amplifier (14), a transmitting antenna (15) and a receiving antenna (16). The invention further provides an optical up-conversion, optical fiber transmission and self-interference elimination method. According to the invention, the influence of the up-conversion transmission signal on the signal received by the far-end base station can be eliminated, the transmission quality of the received signal is improved, and the base station is simplified.

A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

Embodiments are disclosed for non-intrusive transducer health detection in an audio system. In an embodiment, a method performed by the audio system comprises outputting one or more encoded inaudible acoustic signals into an acoustic transmission medium using a first transducer. The one or more encoded inaudible acoustic signals are received from the acoustic transmission medium using a second transducer of the audio system. The received one or more encoded inaudible acoustic signals are used to identify failure or degradation of the first or second transducer.

The invention discloses a radar detection imaging method, which comprises the following steps: firstly, calculating the electromagnetic field intensity of a radar signal of a radar to a target point after being transmitted and propagated through an evaporation waveguide medium by using an electromagnetic propagation model; utilizing an electromagnetic scattering model to calculate a radar signal backward far region scattering field of the target and the random sea surface composite scene, namely electromagnetic scattering characteristics; and finally, electromagnetic imaging is carried out on the radar signal backward far region scattered field by using an electromagnetic imaging algorithm. The evaporation waveguide serves as a transmission medium of radar electromagnetic waves, the detection capacity of the radar can be remarkably improved, beyond-visual-range detection can be achieved, meanwhile, compared with free space transmission, the enhancement effect of the evaporation waveguide layer on target electromagnetic signal echoes can improve the detection signal-to-noise ratio of signals, and the detection precision is improved. The method can be applied to a high frequency band to provide a high radar resolution, radar electromagnetic waves are propagated in the evaporation waveguide at a low glancing angle, sea clutter interference in the target echo detection process is reduced, and the precision and reliability of target detection are improved.

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.

Wireless digital communication of information over sound waves is provided using near near-ultrasonic acoustic (audio)-spectrum. A method includes receiving a modulated data signal generated from coupled direct sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) at a transmitter. The modulated data signal has a phase-shift key (PSK) modulated data signal spread by different Q length chip sequence. The method includes demodulating a synchronized data signal by extracting each OFDM data block having a data symbol and preamble and postamble symbols which were transmitted on an orthogonal sub-carrier with variable Q length chip sequence for multi-user communication over air as a transmission medium. This enables synchronization of communication over the air between transmitters and receivers in multiple user devices in the presence of multiple path propagation and different signal to noise ratios. Simultaneous communication over air between transmitters and receivers in multiple user devices can be done.

Wireless digital communication of information over sound waves is provided using near near-ultrasonic acoustic (audio)-spectrum. A method includes receiving a modulated data signal generated from coupled direct sequence spread spectrum (DSSS) and orthogonal frequency division multiplexing (OFDM) at a transmitter. The modulated data signal has a phase-shift key (PSK) modulated data signal spread by different Q length chip sequence. The method includes demodulating a synchronized data signal by extracting each OFDM data block having a data symbol and preamble and postamble symbols which were transmitted on an orthogonal sub-carrier with variable Q length chip sequence for multi-user communication over air as a transmission medium. This enables synchronization of communication over the air between transmitters and receivers in multiple user devices in the presence of multiple path propagation and different signal to noise ratios. Simultaneous communication over air between transmitters and receivers in multiple user devices can be done.

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.

Aspects of the subject disclosure may include, for example, a device including a detector configured to identify a narrow-band absorption occurring within a signal spectrum of an optical signal propagating through a gaseous medium, wherein the optical signal is configured to communicate digital information via an optical communication link including a transmitter, a receiver and an optical transport medium therebetween. The device further includes a mitigation controller configured to control a digital circuit to mitigate at least a portion of a vulnerability of the optical communication link, the vulnerability associated with the narrow-band absorption. Other embodiments are disclosed.

A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

Provided in the present application are a packaging structure and a manufacturing method therefor, a board-level architecture and a communication device. The packaging structure comprises: a lead frame, at least one first chip, a plurality of first vertical leads, a plurality of first fan-out pads and a first plastic package. Each first chip is located on the lead frame, each first fan-out pad is located on the side of the first chip facing away from the lead frame, and each first vertical lead is located between the lead frame and the first fan-out pad. A first end of at least one first vertical lead is in contact connection with a surface of the lead frame or the first chip, and a second end of same is electrically connected to the first fan-out pad. The first plastic package wraps the at least one first chip and the plurality of first vertical leads, and the plurality of first fan-out pads are located on the surface of the first plastic package. In the embodiments of the present application, signal fan-out and heat dissipation of the packaging structure are not on the same side, and there is no need for an interposer to transmit signals; thus, the size of a board-level architecture is small, the loss of a signal transmission medium is low, and the cost is also low.

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.

The invention discloses a test box and a test system. The test box comprises a box body used for accommodating a to-be-tested piece and providing a test environment; the signal processing device is used for collecting and processing a test signal provided by the to-be-tested piece, and the signal processing device comprises an attenuation unit used for attenuating the test signal; the control unit is used for providing an adjusting signal matched with the test signal for the attenuation unit so as to adjust the attenuation degree of the test signal; and the output unit is used for amplifying and outputting the attenuated test signal. Through targeted amplitude adjustment of different test signals, the reliability of the test signals is improved, the test signals are enabled to be better matched with impedance of a transmission medium, the transmission efficiency and quality of the signals are improved, and loss and distortion of the test signals in the transmission process are reduced.

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.

To enable communication using scaffolding as a transmission medium through a signal transmission device.SOLUTION: The signal transmission device uses, as a communication signal transmission medium, a steel pipe that is a scaffolding component and placed vertically to the ground. A modulator is provided to contact the steel pipe. The modulator converts communication signals within the scaffolding and communication signals of other standards bidirectionally. Accordingly, the scaffolding can be used also as a communication medium in addition to the original function for workers working at a construction site.SELECTED DRAWING: Figure 1

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.