188results about How to "Extended propagation distance" patented technology

Provided are a method and a device for tunnel advance geology forecast with tunnel face blasting as a focus. The method comprises the steps of (1) drilling holes on two lateral walls at the inlet position in a tunnel; (2) filling a coupling agent into the drilled holes, and attaching weave detectors to the walls of the drilled holes; (3) winding a trigger circuit copper wire on cartridged explosive, and placing the cartridged explosive into a blasted hole of the tunnel face; (4), enabling two three-component weave detectors buried in a tunnel hole to receive reflective earthquake wave signals; (5) sending the signals to an amplifier after the signals are selected by a multi-way switch; (6) enabling the amplifier to amplify the signals and then transmit the signals to an analog/digital (A/D) converter through wireless transmission; (7) enabling a wireless communication module of a control chamber to receive a wireless signal and then transmit the wireless signal to a host, and recording the signal; and (8) achieving geology forecast through an processing program installed in the host. The device comprises signal acquisition, wireless communication and control and a data analyzing system. The method is simple, easy and low in cost, can be used for advance geology forecast of tunnels, holes and roadway underground spaces, and achieves automation and normalization of geology forecast.

The invention relates to a traffic early-warning method, an information transmitter, an information receiver and a traffic early-warning system, belonging to the field of traffic safety. The traffic early-warning method, the information transmitter, the information receiver and the traffic early-warning system are automatically or manually or circularly triggered according to time period. Traffic early-warning information is processed and transmitted by technologies, i.e. the information processing, the radio receiving and transmitting, the directive antenna, the broadcast type communication, the relay retransmission, the alarm display and the like. The propagation path can be widened, the propagation mode can be improved, the propagation distance can be prolonged, and the propagation effectiveness and the information initiative can be improved. The sufficient information sharing among main bodies of the road traffic can be realized. The traffic safety early-warning where the abnormal situation does not form the actual danger, the early-warning distance reaches the furthest kilometer level, and the early-warning time reaches the longest minute level can be provided for vehicle drivers; and a traffic sign facility is used for transmitting the traffic sign information to a receiver on a vehicle through radio wave and transmitting to drivers, and preferably, the receiver transmits an active alarm signal corresponding to the received traffic sign information with the appointed type.

The invention discloses a non-contact human-computer interaction method and system. The method comprises the following steps of: emitting and receiving light, extracting and processing signals, and decoding and sending operating instructions. The system comprises an emitting device, a receiving device and a control device. An interaction function is realized by instructing parts to do some simple actions, and near-distance accurate operation is not required, so that far-distance human-computer interaction is realized to a certain extent. The method and system disclosed by the invention are particularly applicable to handheld electronic equipment.

The invention relates to a feed-backward type radar antenna, which comprises a feed source and a metamaterial panel. The metamaterial panel comprises a plurality of core layers with same refractive index distributions. Each core layer comprises a plurality of metamaterial units. Each metamaterial unit comprises a unit substrate and an artificial micro-structure. According to the feed-backward type radar antenna disclosed by the invention, the far field power of the antenna is greatly increased by changing the refractive index distribution condition in the metamaterial panel; therefore, the propagation distance of the antenna is increased; simultaneously, because a wave absorption material layer is arranged in the cavity of the antenna, the front-to-back ratio of the antenna is increased, thus, the antenna has better directivity.

The invention discloses a separated-type negative oxygen ion generation device, which comprises an insulated housing, a first negative voltage boost unit, a negative ion release unit, a negative oxygen ion separating unit and an air supply unit, wherein the first negative voltage boost unit, the negative ion release unit, the negative oxygen ion separating unit and the air supply unit are arranged in the housing. The negative ion release unit comprises a carbon brush; the first negative voltage boost unit is connected with an external power supply and the carbon brush, and provides a 20-30 kv negative high voltage or even more higher negative voltage to the carbon brush; the carbon brush is arranged in the center of the housing, and the tip end of the carbon brush faces downwards; the negative oxygen ion separating unit comprises an upper through hole and a lower through hole arranged in the upper portion and the lower portion of the housing respectively; the total effective area of the upper through hole does not exceed 50% of the total effective area of the upper and lower through holes; and the air supply unit is connected with the negative ion release unit, and provides air. The device can generate highly-purified negative oxygen ions, and can separate the negative oxygen ions from other ions.

The invention discloses an acoustic cover layer beneficial for underwater damping and sound absorbing of ships. The cover layer is composed of a surface layer, a sandwich sound absorbing layer, and anadhesive layer. The surface layer is made of glass fiber reinforced plastic, wherein the density of the glass fiber reinforced plastic is close to water density, and the impedances of the glass fiberreinforced plastic and water are matched. The sandwich sound absorbing layer is composed of polyurethane and vermiculite powder and is prepared by a layering method. The sandwich sound absorbing layer has a functional gradient structure, whose material parameters change along with the thickness direction. Hollow glass beads are distributed in the sandwich sound absorbing layer; the content of thehollow glass beads decreases from outer to inner along with the thickness direction, the density increases; the adhesive layer and the surface layer are adhered on the steel shell of a ship, and theadhesive layer is made of an visco-elastic material. The cover layer satisfies two conditions that the impedances are matched and the sound attenuation performance is good; the target strength and radiation noise of ships and underwater structures can be reduced effectively; the anti-detection performance and stealth performance of ships and underwater structures are both improved; and the cover layer has a wide application prospect in fields such as military ships, civilian ships, underwater structures, and the like.

The invention discloses a rock mass real-time wave velocity measurement and quality evaluation method and belongs to the technical field of rock mass engineering. The method is characterized in that abutton of an ultrasonic wave sending device is continuously pressed at different ultrasonic wave sending positions and at different time, and the speed of ultrasonic waves propagated to each sensor each time is continuously calculated, and inversion is performed according to parameter change values such as wave speed, attenuation coefficient, waveform, frequency, frequency spectrum, amplitude andthe like to obtain physical and mechanical indexes and microstructure characteristics of the rock-soil body, such as change conditions of pores and cracks, so as to analyze the stability condition ofa mine rock body. The device is advantaged in that the device is combined with a micro-seismic system, testing can be completed only by arranging an ultrasonic sending system, operation is easy, theprice is low, and practicability is high; the ultrasonic testing technology has strong advantages in the field of rock-soil testing, ultrasonic waves have geometrical acoustics and physical acousticsat the same time, directivity of the sound waves is good, and energy is high; flexibility is high, and the test time, the test frequency, the test depth and the test position can be manually controlled.

The invention discloses a graphene SPP propagation device of a periodic grating structure. The device is characterized by comprising a silicon dioxide substrate layer and a graphene layer, and a periodic grating structure is etched on the upper surface of the silicon dioxide substrate layer; an organic dye gain medium is arranged in the ridge of the periodic grating structure; the graphene layer is of an array nanobelt structure; the upper surface of the silicon dioxide substrate layer is in lap connection with the graphene layer of the array nanobelt structure. According to the graphene SPP propagation device of the periodic grating structure, SPP resonance can be enhanced, the periodic graphene SPP waveguide propagation distance is increased, the structure is simple, and the device is easy to realize.

A contactless connector includes a first communication chip configured to at least one of transmit and receive wireless RF signals, a second communication chip configured to at least one of transmit and receive wireless RF signals, and a waveguide structure between the first and second communication chips. The waveguide structure conveys RF signals between the first and second communication chips.

The invention discloses a simulation test method for an underground person locating algorithm, and the method employs a moving node, a fixed node, a main controller, a CAN bus, a well monitoring server, and a remote monitoring server. The moving node is electrically fixed with the fixed node, and the fixed node is electrically connected with the main controller. The main controller is electrically connected with the well monitoring server, and the well monitoring server is electrically connected with the remote monitoring server. According to the invention, the method employs CC2410 as a radio frequency front end, and enhances the underground communication effect of a coal mine. Compared with a conventional CC2530, the combination of CC2530 and CC2410 serving as the node core of an underground ZigBee network enables the signal transmission distance to be longer, thereby effectively solving problems that a related region and even the whole network may be affected if one part has a problem, the number of online monitoring means is small, the sharing degree of a system is low, and the communication nodes in monitoring systems of different manufacturers cannot be compatible.

A method of performing relay communication in a next generation cellular communication system is disclosed. The next generation cellular communication system includes a base station and a plurality of terminals, and a communication target terminal which has not acquired a Line-Of-Sight (LOS) channel with the base station performs communication through the relay of a relaying terminal which has acquired a LOS channel. The base station determines the relaying terminal. The relaying terminal forms a relaying terminal group by determining one or more relaying assistant terminals. The communication target terminal forms a transmitting/receiving terminal group by determining one or more transmitting/receiving assistant terminals. The base station performs communication with the relaying terminal through the relaying terminal, relaying assistant terminals of the relaying terminal group and the transmitting/receiving assistant terminals of the transmitting/receiving terminal group.

The invention discloses an optical device for laser beam wave-front correction and a laser beam wave-front correction method. The optical device comprises an optical material, temperature controlling units, a radiating device and a temperature controller, wherein the optical material is used for receiving laser beams emitted from a laser gain medium through one end face, and emitting laser beams from another end face or emitting from the end face for receiving laser beams; theeach temperature control unit is used for heating or cooling under the control of the temperature controller; the radiating device is used for dissipating waste heat generated by the temperature control unit(s) when the temperature controller is used for controlling the temperature control unit(s) to cool; and the temperature controller is used for controlling the one or more temperature control units to heat or cool and controlling the heating amount or cooling amount of the one or more temperature control units, so as to control the temperature of laser beams on a path in the optical material and correct the wave-front of laser beams emitted into the optical material.

The present invention includes a three-dimensional base body (40) having a curved surface allowing definition of a circular orbital band (B), an electroacoustic transducer (21) arranged on the orbital band (B) of the three-dimensional base body (40) and configured to excite surface acoustic wave to perform multiple roundtrips along the orbital band (B), and a sensitive film (25) formed on at least a part of the orbital band (B) of the three-dimensional base body (40) and configured to react with a specific gas molecule. The surface acoustic wave experienced the multiple roundtrips along the orbital band (B) is then converted into a high frequency electric signal again by an interdigital transducer (21). The resulting high frequency electric signal is transferred to a detection/output unit (24) via a switching unit (23) and then detected by the detection/output unit (24).

Magneto-elastic amorphous alloy material and a preparation method thereof are provided. The material is composed of FexReyBz, wherein, Re is one or more than two of La, Sm, Tb, Dy and Y. The preparation method is to mix and melt the FexReyBz into master alloy according to the atom percentage, produce amorphous wires on self-developed wire spraying equipment, strengthen internal stress through drawing the wires and improve the magneto-elastic performance of the wires. The material is provided with the 10<-3> vertical large magnetostrictive coefficient. And through the quenching and rapid setting preparation method, extremely large inner stress gradient from the surface to the core of the wires is made. The material is also provided with large inner stress anisotropy performance, and part of magneto-elastic performance is produced. The surface crystallization layer of the wires, the thickness of which is tens of nanometers to hundreds of nanometers, and amorphous matrixes produce magnetocrystalline anistotropy energies which strengthen the magneto-elastic performance of the wires. The material is provided with the vertical large magnetostrictive coefficient and makes use of a self-developed displacement sensor and a measurement instrument. Compared with the present import super-magnetostrictive displacement sensor, the sensor has the advantages of large investigation depth, high precision and strong vibration resistance capacity.

The invention discloses a pipeline blockage detection system based on a low-frequency sound wave, belongs to the technical field of pipeline detection, and aims at achieving the purpose of more accurate condition expression of pipeline blockage detection for blockage. The pipeline blockage detection system based on the low-frequency sound wave comprises a waveform generator, a low-frequency electroacoustic transducer, a microphone and a signal resolution device, wherein the waveform generator is used for generating an excitation signal, the excitation signal is transmitted to the low-frequency electroacoustic transducer, the excitation signal is converted to a low-frequency pulse sound wave signal by the low-frequency electroacoustic transducer, and transmitted into a pipeline to form anincident wave and a reflected wave in the pipeline; and the microphone receives the sound wave signal in the pipeline and transmits the sound wave signal to the signal resolution device, the signal resolution device resolves the sound wave signal to reflect the position of a blocking object. The pipeline blockage detection system based on the low-frequency sound wave has the following effect: theoccurrence position and the degree of blockage can be timely detected in an initial phase that the pipeline is incompletely blocked.

The invention discloses a glass-loaded asymmetric surface plasmon polariton spread device of a SiO2-gold film-SiO2 waveguide structure. The device is characterized by comprising a top SiO2 layer, a gold film layer, an L-shaped glass layer and a bottom SiO2 layer which are sequentially laminated, wherein the outer end face of the L-shaped long edge of the glass layer is laminated with the gold film layer; the inner end face of the L-shaped long edge is laminated with the bottom SiO2 layer; a grating structure is etched on the gold film layer; spread conduction type SPPs produced on the interface of the top SiO2 layer-gold film layer through excitation is enhanced by the grating structure. According to the device, the SPPs is excited by using the similar Kretschmann structure; the SPPs excitation is enhanced by using the grating structure; localization in the SPPs spread process is enhanced between glass and the SiO2 layer by total reflection by using reflected light of the gold film; the SPPs spread distance is meanwhile improved without sacrificing the sub-wavelength confinement of the waveguide. Key devices can be provided for application of the SPPs in the aspects such as novel photonic devices, wideband communication systems, tiny photonic circuits and optoelectronic integration; the device is low in cost and easy to implement.

The invention relates to a metamaterial antenna which comprises a vibrator, a metamaterial film layer and a reflector, wherein the vibrator is used for generating electromagnetic waves; the metamaterial film layer is used for converging the electromagnetic waves generated by the vibrator and outwards radiating the electromagnetic waves and is also used for converting spherical electromagnetic waves generated by the vibrator into planar electromagnetic waves, and comprises a plurality of metamaterial sheet layers; and the reflector is used for reflecting partial electromagnetic waves generatedby the vibrator to the metamaterial film layer, is a cover-free cavity and forms a closed cavity together with the metamaterial film layer, and the vibrator is arranged in the reflector. Through changing the refractive index distribution condition inside the metamaterial film layer, the invention ensures that a half-power bandwidth of an antenna far field is reduced, further propagating distance of the antenna is increased, and front-to-back ratio of the antenna is increased.

The invention belongs to the field of road facilities, in particular to an isolation pier with an alarm function based on magnetic force and vibration force. The isolation pier comprises a pier body,a cavity is formed in the pier body, a cattlehide film is fixedly connected to the cavity and is in a tensioned state, a plurality of magnetic sheets are bonded to the side wall of the lower end of the cattlehide film, a fixing plate is connected into the cavity, and a magnetic strip is bonded to the side wall of the upper end of the fixing plate. The cattlehide film is matched with the cavity, under knocking of rainwater, the cattlehide film vibrates and sounds to remind a driver; the coil is matched with the magnetic sheet, the coil can cut magnetic induction lines to generate current, the warning lamp is started, visual warning is given to a driver, no additional power equipment is needed to start the warning lamp, equipment cost is saved, the T-shaped sliding rod reciprocates to drivethe impact ball to impact the arc-shaped copper block to make a sound, and passing vehicles are further reminded through warning sound.

The invention discloses an ultrasonic generator based on a linear frequency modulation technology and a method for detecting metal welding seam defects by adopting the same and relates to the technical field of quality detection of a welding structure. By means of the ultrasonic generator based on the linear frequency modulation technology and the method for detecting the metal welding seam defects by adopting the ultrasonic generator, the problems that ultrasonic signals generated by an existing ultrasonic inspection and measurement signal generation device are short in transmission distance, and the ultrasonic inspection and measurement signal generation device has poor small defect detection capability on welding seams of large-thickness super metal worlpieces can be solved. A linear frequency modulation signal generation circuit generates linear frequency modulation signals through a first control unit, a second control unit and an upper computer and transmits the generated pulse signals to the welding seams of the metal workpieces to detect the metal workpieces to be detected, an ultrasonic signal acquisition device is used for collecting ultrasonic signals reflected by the welding seams of the metal workpieces, and the upper computer is used for performing matching filtering on the received ultrasonic signals so as to obtain metal welding seam defect positions. The ultrasonic generator is suitable for the technical field of quality detection of the welding structure.

The invention discloses a remote online spectrum detection system. The system comprises a light source module, a beam splitter which is arranged behind the light source module, a first detection light path module, a second reference light path module, a spectrum detection module and a light path chopper, wherein the first detection light path module, the second reference light path module and thespectrum detection module are arranged behind the beam splitter respectively; the light path chopper is arranged between the first detection light path module and the second reference light path module; the first detection light path module comprises a first optical fiber collimating lens, a detection optical fiber core and a spherical sample cell sequentially; the second reference light path module comprises a planar mirror, a second optical fiber collimating lens and a reference optical fiber core sequentially, and metal silver is applied to the output end face of the reference optical fiber core; and the distance between the detection optical fiber core and the reference optical fiber core is in microndimension. The remote online spectrum detection system provided by the invention has high resolution, and stability, and is low in maintenance cost on the basis of realizing optical fiber long-distance transmission.

The disclosed ultrasonic flow measuring device comprises: a measurement end with a transmission node, an electronic node, and a sound node; and a control end, wherein the former sound node comprises: a mechanical frame with a thin-wall cylinder clung to its inner wall, and a first and second energy transducer inclined on cylinder ends. Besides, the corresponding measuring method comprises: 1) arranging the measurement device into the target center; 2) measuring the sound reflux transmission time t1 and the downstream transmission t2 for delta t=ABS (t1-t2); 3) obtaining the liquid speed by v=c2delta t/2L. This invention has well precision and fit to avoid oil pollution.

The invention discloses a surface plasmon coaxial optical wave guide structure which relates to an optical wave guide. The surface plasmon coaxial optical wave guide structure is good for the light signal transmission. A cylindrical core layer and a tubular shell layer are arranged; the cylindrical core layer is a metal core layer; and the shell layer is a wide band-gap media shell layer. The surface plasmon coaxial optical wave guide structure taking metal as the core layer enlarges the transmitted light signal in the wave guide, and provides a resonant cavity with small mode volume, thereby improving fineness and facilitating transmission efficiency of the objective light signal.

The invention relates to a fallback type radar antenna which comprises a feed source and a metamaterial panel. The metamaterial panel comprises a plurality of core layers with same refractive index distribution, each core layer of the metamaterial panel is composed of a plurality of metamaterial units, and each metamaterial unit comprises a unit substrate with one or a plurality of holes. The fallback type radar antenna greatly strengthens far-field power of the antenna and promotes a propagating distance of the antenna by changing a distribution condition of refractive indexes inside the metamaterial panel, and simultaneously an absorbing material layer is arranged inside a cavity of the antenna to increase a front-to-rear ratio of the antenna and enable the antenna to have directivity.