109 results about "Transmission medium" patented technology

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.

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.

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 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 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 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.

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.

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.

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.

35 ABSTRACT A switch box is provided comprising: a housing, a rotatable shaft, a rotatable indicator and at least one channel. The housing comprises at least a first housing portion and a second housing portion. The first and second housing portions are connectable to5 define a chamber for housing one or more switches. Each of the first housing portions comprises a shaft aperture. The rotatable shaft is located partially in the shaft aperture of the first housing portion and partially in the shaft aperture of the second housing portion. The rotatable indicator is arranged to visually indicate a state of opening of a valve, and is connected to the shaft such that the rotatable indicator corotates with the 10 shaft. The channel is arranged to convey electromagnetic radiation, generated inside the chamber, through the housing and out of the switch box. The channel is provided, in part, by a further aperture in one of the first and second housing portions that is different from the shaft apertures in the first and second housing portions. The channel is provided, in part, by a solid transmission medium, located at least partially within the 15 further aperture. The solid transmission medium is at least partially transparent to electromagnetic radiation.

The invention provides a coaxial connector and microwave communication equipment, relates to the technical field of satellite communication, and solves the problem that microwave transmission between different transmission media is poor in reliability and is difficult to apply to a high-frequency scene in the prior art. The coaxial connector of the scheme can complete conversion of electromagnetic wave propagation modes of radio frequency signals through different media and connection structures, thereby realizing transmission of the radio frequency signals from coaxial to microstrip or from microstrip to coaxial, and the coaxial connector is low in insertion loss and good in return loss effect, and can be effectively applied to a microwave frequency band.

The invention discloses a pressure transmitter resistant to ultrahigh temperature and high vacuum working conditions, which adopts a rigid force conduction structure to replace a traditional liquid pressure transmission medium, and realizes rigid transmission of medium pressure from a second isolation diaphragm to a first isolation diaphragm. The problems of compression, leakage, bubbles and the like of a liquid medium in an ultra-high-temperature and high-vacuum environment are fundamentally avoided, so that the pressure transmitter can tolerate the ultra-high temperature of 450 DEG C or above and the high-vacuum working condition of 1 * 10 (-9) Pa or above; meanwhile, by adjusting the state of the force conduction cavity, the heat dissipation capacity can be optimized, the temperature gradient can be effectively controlled, the temperature of the measured medium can be reduced to the range which can be borne by the transmitter body or the filling liquid, the pressure on the two sides of the second isolation diaphragm can be balanced, diaphragm deformation is remarkably reduced, and therefore the influence amount of the temperature on pressure measurement is reduced, and the measurement accuracy is improved. And the measurement precision and long-term stability are improved.

A method for recovering a clock from input data, in a deserializer that couples a transmission medium to receive circuitry of a data transceiver, includes operating, in a first clock recovery loop, on equalized input data from a data recovery loop to provide a first timing error signal, operating, in a second clock recovery loop, on unequalized input data to provide a second timing error signal, combining the first and second timing error signals, and deriving a recovered clock signal from the combined first and second timing error signals using an oscillator circuit. Combining the first and second timing error signals may include operating on the first and second timing error signals in a manner that filters the first timing error signal to remove low-frequency components including adaptation errors introduced by the data recovery loop, and that filters the second timing error signal to remove high frequency components including jitter.

The invention is suitable for the technical field of steam turbine safety testing, and provides a testing method and system, terminal equipment and a computer readable storage medium, and the method comprises the steps: transmitting a first signal to a sliding valve in a target channel; wherein the first signal is used for indicating the sliding valve to perform position sliding in a target channel so as to change the pressure value of a transmission medium in the target channel, and the target channel is any one of a plurality of test channels; a first sliding position where the sliding valve slides according to the first signal is monitored, and a first pressure value of a transmission medium in the target channel is obtained; and determining a test result corresponding to the target channel according to the first sliding position of the sliding valve and the first pressure value of the transmission medium in the target channel. According to the method, the oil ways of the multiple channels of the steam turbine protection system can be effectively detected, and the reliability of the steam turbine protection system is improved.

The invention discloses a broadband sound body wave delay line device film layer structure and a preparation method thereof. The film layer structure comprises a sound transmission medium, an input thin film transducer and an output thin film transducer, wherein the input thin film transducer and the output thin film transducer are arranged at the two ends of the sound transmission medium respectively; each of the two thin film transducers comprises a bottom electrode, an AlScN piezoelectric thin film and an upper electrode which are sequentially arranged away from the sound transmission medium; the orientation of the AlScN piezoelectric film is C-axis orientation, and the full width at half maximum is 1-4; and the doping concentration of Sc in the AlScN piezoelectric film is 5 at%-25 at%. According to the film layer structure, the AlScN thin film is adopted as a piezoelectric material of the transducer, due to the high electromechanical coupling coefficient of the AlScN thin film, the bandwidth of the device can be effectively improved through the structure, and the application scene with the higher bandwidth requirement is met. In addition, by further controlling the orientation, the full width at half maximum and the Sc doping concentration of the AlScN thin film, the relative bandwidth can reach 98% or above, and wider signal processing capacity and anti-interference capacity are achieved.

The application discloses a circuit-to-waveguide conversion structure, comprising: a waveguide and a dielectric substrate, the waveguide is fixedly connected with the dielectric substrate, the waveguide is provided with a waveguide port for energy transfer with the dielectric substrate, an energy limiting part is provided around the waveguide port and is inwardly recessed, the energy limiting part is connected with the dielectric substrate to form a cavity, the opposite upper space of the cavity presents a high impedance surface to electromagnetic waves of a target working frequency band, the high impedance surface can inhibit the propagation of electromagnetic waves in the gap between the upper surface of the dielectric substrate and the lower surface of the waveguide, the transmission of space electromagnetic waves is inhibited, the dielectric substrate is provided with a circuit transmission line and a quasi-waveguide feeding part, the quasi-waveguide feeding part is oppositely arranged with the waveguide port, the end of the circuit transmission line is connected with the quasi-waveguide feeding part, and the quasi-waveguide feeding part is used for transmitting the energy on the circuit transmission line to the quasi-waveguide feeding part and generating excitation, and the electromagnetic wave transmission mode of the quasi-waveguide feeding part is consistent with the electromagnetic wave transmission mode in the waveguide.

The application discloses a mirror suppression mixing device with in-band self-interference cancellation capability, wherein a central station comprises a signal processing module, a 90-degree electrical coupler a, a photodetector x, a photodetector y, a polarization beam splitter and an optical power amplifier; a transmission medium is a single-mode optical fiber; a remote base station comprises a laser, a polarization controller, a polarization multiplexing-double drive-Mach-Zehnder modulator, an optical filter, a receiving antenna, a transmitting antenna, a direct current source x, a direct current source y, an electrical beam splitter a and an electrical beam splitter b, an electrical beam combiner a and an electrical beam combiner b, a 90-degree electrical coupler b, a local oscillator signal generator, an electrical attenuator and an electrical delay line. The application also provides a mirror suppression mixing method with in-band self-interference cancellation capability. The application not only can play the high spectral efficiency advantage of the in-band full duplex system, but also is not affected by the dispersion-induced power periodic fading phenomenon caused by optical fiber transmission, can effectively eliminate self-interference signals under the in-band full duplex system, and can effectively suppress the mirror interference caused by the open channel reception.

The application discloses a terahertz second harmonic mixer and an integrated circuit, and relates to the technical field of terahertz, and the terahertz second harmonic mixer comprises: a reverse-parallel diode pair and an intermediate frequency output circuit; the reverse-parallel diode pair is composed of two reverse-parallel Schottky diodes based on HEMT process compatibility; the reverse-parallel diode pair is connected with the intermediate frequency output circuit; wherein the transmission medium for connecting the reverse-parallel diode pair with the intermediate frequency output circuit is a coplanar waveguide; the reverse-parallel diode pair is used for frequency mixing received radio frequency signals and local oscillator signals and generating mixed frequency signals, and the intermediate frequency output circuit is used for filtering the mixed frequency signals and outputting. The application can solve the problems of high power consumption of the mixer in the prior art and high difficulty of monolithic integration of the mixer and the HEMT semiconductor device.

The application relates to underwater optical communication technology and discloses a kind of underwater wireless optical communication systems based on rotary laser transmitter, to solve the problem that transmission accuracy of existing underwater wireless laser communication technology is easily affected by transmission medium turbidity and transmission distance.The rotary laser transmitter device of the system is connected with a laser transmitter by each laser controller, and a plurality of laser transmitters are uniformly arranged on the rotary support in the circumferential direction, the device is provided with a transmission hole, and the rotary support is driven by a motor to rotate; the laser receiver receives optical signals from the rotary laser transmitter device, converts the optical signals into electrical signals, and sends the electrical signals to a data acquisition card; the data processing module processes data sent by the data acquisition card; and the control module controls the operation of the laser controller and the motor according to the processing result.The application can adaptively adjust the position and working condition of each wavelength laser transmitter of the transmitting end according to water turbidity and transmission distance, and ensure the transmission accuracy of the system.

The invention discloses a wireless monitoring system and method for intelligent multi-scene application, and belongs to the field of optical time domain reflectometers and the Internet of Things. According to the invention, OTDR detection and Internet of Things communication module transmission are adopted, so that remote, online and automatic monitoring of a line is realized. By monitoring the length change of the optical fiber in real time, faults of a conveying medium in various scenes can be found and an alarm can be given in time; on the basis of OTDR and Internet of Things technologies, idle optical fibers in multi-scene accompanying optical fibers can be tested in real time and intelligently analyzed, and once a fracture event is found, a client gives an alarm to inform maintenance personnel immediately and timely. Faults can be effectively reduced and prevented, the fault position is accurately positioned, the fault time is shortened, and the workload of maintenance personnel is reduced.

The utility model provides a string light communication system and luminaire wherein the string light communication system is used for communication among string lights, each string light is provided with a controller, the string light communication system comprises: a power line, the power line is used for accessing a power supply; one end of the signal modulation circuit is connected with the power line, and the other end of the signal modulation circuit is connected with a controller of the lamp string; and one end of the signal receiving circuit is connected with the power line, and the other end of the signal receiving circuit is connected with a controller of the lamp string. According to the utility model, the lamp signal modulation circuit and the signal receiving circuit are arranged, the power line is used as a transmission medium, and the communication signal is loaded on the power line for transmission, so that the communication between the lamp strings is realized, no extra communication cable is needed, and the cost is saved. Meanwhile, the adopted circuit is simple in structure and low in cost, and the multiplexing of a communication power line enables the installation and wiring to be simple, the communication distance is not limited, and the anti-interference capability is strong.

The utility model relates to a charging device, the charging device comprises a substrate and a radiation assembly and a control assembly which are located on the substrate, the radiation assembly comprises a radiation unit and a feed unit, the control assembly comprises a driving unit and a coupling unit, the feed unit is coupled with the coupling unit, the coupling unit is electrically connected with the driving unit, and the driving unit is electrically connected with the substrate. The driving unit is electrically connected with the radiation unit; in the charging process, the feed unit is used for receiving a first signal sent by charged equipment and coupling the first signal to the coupling unit, the coupling unit transmits the first signal to the driving unit, the driving unit controls the radiating unit to emit a second signal, and the charged equipment receives the second signal and converts the second signal into electric energy, so that charging is achieved. According to the charging device, the space electric field can be used as an energy transmission medium, a connecting wire is not needed, the charged equipment only needs to be placed in the charging area, air charging of the charged equipment can be achieved, and great convenience and practicability are brought to users.

The invention relates to the technical field of coal mine safety monitoring, and discloses a three-in-one index-based coal and gas outburst real-time prediction system, which comprises an underground while-drilling sensing and sound wave emission subsystem, a drill rod sound wave waveguide transmission medium, an orifice vision and fluid monitoring subsystem and a ground multi-dimensional signal processing and decision-making host. The underground subsystem is used for collecting in-situ data and transmitting sound waves and has an air bag hole sealing function. The drill rod serves as a transmission channel, and the acoustic impedance characteristic changes along with ground stress. A subsystem monitors return drill cuttings and fluid parameters. Inversion of crustal stress is carried out based on sound wave channel attenuation characteristics; and a comprehensive danger index is calculated by fusing gas, ground stress and coal fractal dimensions, and when the comprehensive danger index exceeds the standard, hole sealing is triggered to perform static pressure verification. According to the method, the problem that in-situ crustal stress distribution data is difficult to obtain under the condition that a special sensor is not added in a while-drilling technology is solved, and key mechanical dimension data is provided for outburst risk prediction.

The utility model discloses a transmission medium and a communication system. The transmission medium comprises a cable body and at least two interface modules. The cable body comprises optical fibers and electric wires which are insulated. The different interface modules are located at different ends of the cable body, and each of the at least two interface modules comprises an optical fiber interface and an electric signal interface. The optical fiber interface and the electric signal interface of the same interface module are located at the same end of the cable body. The optical fiber interface is connected with the end part of the optical fiber, and the electric signal interface is connected with the end part of the electric wire, so that the transmission medium has higher anti-interference capability while supporting long-distance communication.