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31 results about "Coherence effect" patented technology
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Cardiac coherence helps in reducing the stress level thereby having a positive effect on health and improving the quality of life.
Suppression of coherence effects in fiber lasers
InactiveUS20120275477A1High amplification gainGreat energy outputOptical devices for laserInjection lockedStored energy
The present invention provides, in at least one embodiment, a scheme which is effective in suppressing detrimental coherence effects such as random backscatter. In a fiber laser having a master oscillator power amplifier design, inserting a decorrelator in between the master oscillator and a first power amplifier or inserting a decorrelator in between the first power amplifier and a second power amplifier to reduce random backscatter, which allows for much more energy to be stored and higher gain without the risk of catastrophic optical damage, thus increasing the peak power that can be delivered as useful laser power. Backscattering can be further reduced by having the master oscillator depolarized, injection locked, and spectrally broadened to reduce the coherence length of the master oscillator.
Owner:BERENDT MARTIN OLE +1
Quantum coherence effect-based antenna gain measuring device
ActiveCN108152602AHigh measurement accuracySimple procedureAntenna radiation diagramsAntenna gainData acquisition
The invention discloses a quantum coherence effect-based antenna gain measuring device. The device comprises an electromagnetic wave absorbing chamber, an atomic gas chamber, a laser light source subsystem, a spectral signal measurement subsystem, a power measurement subsystem, an antenna gain measurement subsystem and a plurality of support platforms. According to the device disclosed by the invention, an optical device is used for triggering an energy spectrum, so that atoms are induced. An energy spectrum is obtained through photoelectric detection. Meanwhile, the wave-absorbing material isadopted to prevent an electromagnetic scattering body from affecting the measurement. Through measuring the feed-in net power of a measurement antenna and the net power of the coupling port of a directional coupler, the data acquisition of the transmitted spectrum of the detection light is completed. A power meter is connected with a computer through a GPIB bus, so that the reading of the feed-inpower value of the antenna is completed. Through an antenna gain measurement model (img file = 'DDA 0001510521350000011.T'wi = '355 'he = '170 '), the gain measurement is completed. Compared with a traditional antenna measuring system, the device has the advantages of high measurement precision, low construction cost, small occupied area and the like.
Owner:NAT INST OF METROLOGY CHINA
Rydberg atomic quantum coherence effect based antenna near field test probe and method
InactiveCN109142891AHigh sensitivityHigh resolutionAntenna radiation diagramsTest efficiencyField tests
The invention discloses a Rydberg atomic quantum coherence effect based antenna near field test probe and method. A near field test of an antenna electromagnetic field can be completed by using the Rydberg atomic quantum coherence effect based antenna near field test probe and method. According to the invention, an atomic gas chamber with the Rydberg atomic quantum coherence effect is used as theantenna near field test probe. The probe has the characteristics of no error correction, high sensitivity and small disturbance to the to-be-tested antenna electromagnetic field, and can measure the electromagnetic field in the range of 1-500 GHz at one time. In addition, a precise probe space scanning mechanical system can be no longer needed by using a probe array disclosed by the invention fortesting, which can effectively reduce the test cost and improve the test efficiency. Moreover, a test process can be simplified and the test efficiency can be improved by using the composite probe added with a phase probe disclosed by the invention to test the antenna electromagnetic field.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY
Radio frequency electric field correcting method and device based on Rydberg atom quantum coherence effect
ActiveCN106842095AOvercome the disadvantage of large errorNo distractionElectrical measurementsRydberg atomLaser light
The invention relates to a radio frequency electric field correcting method and device based on a Rydberg atom quantum coherence effect, and aims to solve the technical problem that an existing electric field measuring method has large errors. According to the adopted technical scheme, a glass cesium bubble provided with a pair of parallel electrode plates is used as a cesium atom sample cell, cesium atoms form electromagnetically induced transparency under the action of probe light sent by two laser light sources and coupling light, the electromagnetically induced transparency has Stark frequency shift and split under the action of a radio frequency electric field and generates dipole sidebands at the Rydberg energy level modulated by the radio frequency electric field, multiple energy level cross points are formed in the Stark spectrum, each cross point serves as a datum point for correcting the electric field, each datum point corresponds to an accurate electric field value, and then the determined electric value is used for correcting the radio frequency electric field. The device is composed of a cesium atom sample cell, two laser light sources, a radio frequency source, a high-reflectivity reflector, a dichroic mirror and a photoelectric detector.
Owner:SHANXI UNIV
Microwave power measuring device and method based on Rydberg atom quantum coherence effect
ActiveCN110261670AHigh sensitivityLarge dynamic rangeElectric devicesElectric power measurementRydberg atomMicrowave power
The invention relates to a microwave power measuring device and a measuring method based on the Rydberg atom quantum coherence effect. A low electromagnetic perturbation atom air chamber equipped with helium vapor is placed in a guided wave system. Two lasers are used to excite ground state rubidium atoms to the Rydberg state. Based on the quantum effect, the measurement of the guided wave electric field is converted into the measurement of the atomic absorption spectrum. The analytical and quantitative relationship between power and the guided wave electric field is used to achieve microwave power measurement traceable to Planck constants. The measuring method provided by the invention has the advantages of high sensitivity, large dynamic range, small measurement uncertainty and the like.
Owner:国仪计测(深圳)量子科技有限公司
High speed laser scanning inspection system
ActiveUS7359045B2Rapidly inspecting a substrateWithout incurring undesirable coherence interference effectsOptically investigating flaws/contaminationLaser scanningLight beam
An optical inspection system rapidly evaluates a substrate by illumination of an area of a substrate larger than a diffraction-limited spot using a coherent laser beam by breaking temporal or spatial coherence. Picosecond or femtosecond pulses from a modelocked laser source are split into a plurality of spatially separated beamlets that are temporally and / or frequency dispersed, and then focused onto a plurality of spots on the substrate. Adjacent spots, which can overlap by up to about 60-70 percent, are illuminated at different times, or at different frequencies, and do not produce mutually interfering coherence effects. Bright-field and dark-field detection schemes are used in various combinations in different embodiments of the system.
Owner:APPL MATERIALS ISRAEL LTD
Laser phase noise measurer
InactiveCN1866037AAvoid stabilityEasy to operateNoise figure or signal-to-noise ratio measurementElectrical testingBeam splittingPrism
The disclosed testing device for laser phase noise comprises: a phase noise conversion device with two polarization beam-splitting lens (1) and (3), and an atom gas chamber or molecule gas chamber (2). Wherein, coupling two beam linear polarization light by (1) to spread into (2), converting the phase noise into amplitude noise by electromagnetic induced coherence effect, using (3) to divide the detecting light and coupling light, and using a balance zero-beat system to detect the outgoing noise. This invention simplifies device fit to mobile and wide application.
Owner:SHANXI UNIV
Broadband And Wide Field Angle Compensator
ActiveUS20150055123A1Minimize coherence effectEfficient implementationRadiation pyrometryPolarisation-affecting propertiesZeroth orderWide field
A rotatable compensator configured to transmit non-collimated light over a broad range of wavelengths, including ultraviolet, with a high degree of retardation uniformity across the aperture is presented. In one embodiment, a rotatable compensator includes a stack of four individual plates in optical contact. The two thin plates in the middle of the stack are made from a birefringent material and are arranged to form a compound, zeroth order bi-plate. The remaining two plates are relatively thick and are made from an optically isotropic material. These plates are disposed on either end of the compound, zeroth order bi-plate. The low order plates minimize the sensitivity of retardation across the aperture to non-collimated light. Materials are selected to ensure transmission of ultraviolet light. The optically isotropic end plates minimize coherence effects induced at the optical interfaces of the thin plates.
Owner:KLA TENCOR TECH CORP
Systems and methods reducing coherence effect in narrow line-width light sources
ActiveUS20140009763A1Reduce coherenceReduce effect of coherenceLaser detailsScattering properties measurementsTime domainLine width
Systems and methods are described for reducing coherence effect in narrow line-width light sources through various modulation techniques. The systems and methods can include a narrow line-width laser source with a thermoelectric cooler thermally coupled thereto and a controller communicatively coupled to the thermoelectric cooler. The controller is configured to provide a varied input signal to the thermoelectric cooler to reduce coherence of the narrow line-width laser source by artificially broadening the narrow line-width on a time averaged basis. The systems and methods can also include direct modulation of the narrow line-width laser source. The systems and methods can include a narrow line-width Optical Time Domain Reflectometer (OTDR). The systems and methods can also include direct modulation of the narrow line-width laser source with or without the varied input signal to the thermoelectric cooler.
Owner:CIENA
Waveguide power sensor structures free of optical coherence effects in a hamr drive
Embodiments disclosed herein generally relate to a HAMR device for use in a magnetic reading system. The HAMR device has a primary waveguide extending from a media facing surface to a surface opposite the media facing surface. In one embodiment, the HAMR head has a secondary waveguide having a first and second end positioned within the HAMR head. The secondary waveguide is positioned near the primary waveguide, and the first and second ends of the secondary waveguide are non-reflecting. A thermal sensor is coupled to the secondary waveguide, and responds only to optical power fluctuations in the primary waveguide. In another embodiment, the HAMR head has a second thermal sensor rather than a secondary waveguide. The first thermal sensor and the second thermal sensor are coupled together to act as one optical power sensor and are disposed on the primary waveguide.
Owner:WESTERN DIGITAL TECH INC
Two-dimensional distribution measurement method of microwave field based on Rydberg quantum coherence effect
InactiveCN106501624BWide measurable microwave frequency bandwidthElectromagentic field characteristicsLinear arraysElectromagnetic induction
The invention discloses a microwave field two-dimensional distribution measurement method based on a Rydberg quantum coherent effect. The basic physics principle which the method relies on is that a typical electromagnetic induction transparence (EIT) peak of Rydberg quanta is split under the effect of a microwave field, and intensity information of a microwave field electric field component can be obtained from a split interval of a split peak. A single atom steam pool is expanded, a 1*50 linear array is formed, and two-dimensional space distribution of microwave field intensity is obtained by scanning the position of the array through a motion control module. The measurement principle of the method is based on the transition frequency and transition intensity of atoms, and therefore, the method has high robustness and accuracy.
Owner:SHANXI UNIV
Device and method for restraining de-coherence effect in heterodyne detection based on CCD camera
ActiveCN109100026AImproving the Signal-to-Noise Ratio of Optical Heterodyne DetectionMature technologyOptical measurementsBeam splitterPhase difference
The invention discloses a device and a method for restraining a de-coherence effect in heterodyne detection based on a CCD camera. The device comprises a laser device, a first beam splitter, a local oscillator light path acousto-optic frequency shifter, a signal light path acousto-optic frequency shifter, a second beam splitter, an optical antenna, a reflector, a third beam splitter, the CCD camera, an image signal processing system and a signal-to-noise ratio feedback system. The frequency of an intermediate-frequency heterodyne signal is reduced to be in a range detectable for the CCD camerathrough the two frequency shifters; a phase difference between the optical heterodyne signals of different pixels is recognized through an image processing technology, and an image signal output sequence is adjusted according to the phase difference, so that all pixel output signals are subjected to in-phase stacking and output; and meanwhile, a heterodyne signal output sequence can be adjusted again according to a signal-to-noise ratio of the heterodyne signal, and the signal-to-noise ratio of the optical heterodyne signal can be calculated again according to the adjusted heterodyne signal output sequence, until the output signal-to-noise ratio of the optical heterodyne signal is larger than or equal to a threshold value, so that the signal-to-noise ratio of the heterodyne detection is obviously improved.
Owner:XIDIAN UNIV
Accurate positioning method based on echo coherence effect
ActiveCN102505966AAchieve positioningHigh positioning accuracyMining devicesAmbiguitySelf correlation
The invention relates to the movable target positioning technology, in particular to an accurate positioning method based on the echo coherence effect, and solves the problem that the conventional underground personnel positioning technology has a high positioning ambiguity. The method comprises the following steps: (1), a detection waveform with a favorable self-correlation performance is designed; (2), an identification sensor sends a calling signal to an identification card carried by underground personnel periodically, and the identification card sends an echo signal to the identification sensor; (3), a coherence receiver receives the echo signal while moving unceasingly, and the detection waveform in the echo signal completely coincides with the detection waveform input in the coherence receiver when the coherence receiver moves to a position where the round-trip-delay of the echo signal is a specific value T; and (4), and the distance L between the identification sensor and the identification card is calculated out according to the round-trip-delay T. The method has the advantage that the problem that conventional underground personnel positioning technology has a high positioning ambiguity is solved, so as to be suitable for underground personnel positioning in a coal mine.
Owner:太原海斯特电子有限公司
Optical pulse design method for carrying out high fidelity control on ensemble quantum bits
PendingCN112232514ARobustImprove robustnessQuantum computersPhotometry using electric radiation detectorsLaser intensityQuantum control
The invention discloses an optical pulse design method for carrying out high fidelity control on ensemble quantum bits, which adopts a reverse engineering method based on Lewis-Riesenfield invariantsand utilizes the perturbation theory and the concept of system error sensitivity to construct a quick and efficient double-color optical pulse with high robustness for frequency detuning and laser intensity fluctuation. The pulse can be applied to a three-level system with non-uniform broadening, and any superposition state of ensemble quantum bits is created with high fidelity. In the pulse action process, quantum control has high robustness for instantaneous change or spatial non-uniform distribution of laser intensity, the robustness can improve the signal-to-noise ratio of a detection signal, and the experiment difficulty is reduced; meanwhile, the time for the quantum bits to be in the excited state is remarkably shortened, the decoherence effect of the quantum bits can be greatly reduced to ensure high-fidelity control is achieved.
Owner:SUZHOU UNIV
Illumination compensator for curved surface lithography
InactiveUS7106415B2Efficient couplingPhotomechanical exposure apparatusMicrolithography exposure apparatusLithographic artistImage resolution
A zero power identical pair of oppositely-oriented meniscus lens elements mounted in the projection light path, serves as curved mask support while compensating for optical anomalies such as beam shift and beam deviations produced by other transparent supports for the curved mask. The zero-power meniscus lens pair, without affecting the transmission beam characteristics, lets the beam diffract as efficiently as does a regular planar mask, thus preserving the partial coherence effects and resolution concepts of projection lithography. This simple but novel optics device is not only expected to clear several barriers for curved mask projection lithography but also find place in other applications where collimated or converging light beams have to travel extra paths without significant aberration.
Owner:ANVIK CORP
High speed laser scanning inspection system
InactiveUS7365836B2Rapidly inspecting a substrateWithout incurring undesirable coherence interference effectsOptically investigating flaws/contaminationLaser scanningLight beam
Owner:APPL MATERIALS ISRAEL LTD
Light source device and laser projector
The invention discloses a light source device and a laser projector, which belong to the technical field of laser. At least two second laser components are controlled by at least two second digital power signals corresponding to at least two kinds of second color light respectively. The at least two second laser components are used for emitting at least two kinds of second color light with different wavelengths, and the coherence effect is weakened due to the different wavelengths of different kinds of second color light. The problem of low imaging quality of light emitted by the light sourcedevice in the related technology is solved. The imaging quality of light is improved.
Owner:QINGDAO HISENSE LASER DISPLAY CO LTD
Double-color all-optical switch based on quantum well inter-subband transition cavity-induced coherence effect
ActiveCN103928558AEasy to MiniaturizeEasy to integrateSemiconductor devicesSemiconductor materialsFar infrared
The invention discloses a double-color all-optical switch based on a quantum well inter-subband transition cavity-induced coherence effect, and belongs to the technical field of semiconductor materials. According to the structure of the double-color all-optical switch, an AlAs layer (2), a first barrier layer (3), a first quantum well layer (4), a second barrier layer (5), a second quantum well layer (6), a third barrier layer (7), a third quantum well layer (8), a fourth barrier layer (9) and a continuous area (10) sequentially grow on a substrate (1) made of GaAs materials, a cycle is from the first barrier layer (3) to the continuous area (10), six to fifteen cycles are arranged, and then a covering layer (11) and an air isolation layer (12) are provided. The double-color all-optical switch based on the quantum well inter-subband transition cavity-induced coherence effect can work at a medium-far infrared wave band, serves as a complete band gap switch of an infrared radiation source with low energy consumption and high efficiency, and has application value on the aspects of satellite detection and communication. The structure and materials of the double-color all-optical switch can be selected artificially, and the double-color all-optical switch has the advantages of easily achieving a wide wave band, miniaturization and integration.
Owner:JILIN UNIV
Air interface test system and method based on atomic coherence effect
PendingCN113985150AWith self-calibration functionHigh sensitivityAntenna radiation diagramsBeam splitterAir interface
The invention discloses an air interface test system and method based on an atomic coherence effect, and the method comprises the steps: uniformly arranging a plurality of prism-type atomic antenna probes at specific angle intervals on a circular scanning support in a microwave darkroom according to the requirements of a sampling theorem to form an annular atomic probe array; connecting the annular atom probe array to the optical fiber beam splitter through an optical fiber; placing a to-be-tested antenna on the rotary table, and guaranteeing that the phase center of the to-be-tested antenna is at the circle center of the scanning support; taking the to-be-tested antenna as a transmitting antenna, and enabling the atomic microwave electric field meter to sequentially control the prism type atomic antenna probe to complete data acquisition of each receiving channel; enabling a control computer to control the antenna turntable to rotate the to-be-tested antenna to complete three-dimensional spherical near-field data acquisition; and performing near-far field transformation on the collected spherical near-field data to obtain three-dimensional far-field data. According to the invention, self-calibration can be realized, the to-be-tested electric field is not interfered, the sensitivity is high, the measurable frequency band is wide, the air interface test precision is greatly improved, and the test cost is reduced.
Owner:SOUTH CHINA NORMAL UNIVERSITY
Broadband and wide field angle compensator
ActiveUS9519093B2Minimizing sensitivityMinimize coherence effectPolarisation-affecting propertiesPolarising elementsZeroth orderWide field
A rotatable compensator configured to transmit non-collimated light over a broad range of wavelengths, including ultraviolet, with a high degree of retardation uniformity across the aperture is presented. In one embodiment, a rotatable compensator includes a stack of four individual plates in optical contact. The two thin plates in the middle of the stack are made from a birefringent material and are arranged to form a compound, zeroth order bi-plate. The remaining two plates are relatively thick and are made from an optically isotropic material. These plates are disposed on either end of the compound, zeroth order bi-plate. The low order plates minimize the sensitivity of retardation across the aperture to non-collimated light. Materials are selected to ensure transmission of ultraviolet light. The optically isotropic end plates minimize coherence effects induced at the optical interfaces of the thin plates.
Owner:KLA CORP
Waveguide power sensor structures free of optical coherence effects in a HAMR drive
Embodiments disclosed herein generally relate to a HAMR device for use in a magnetic reading system. The HAMR device has a primary waveguide extending from a media facing surface to a surface opposite the media facing surface. In one embodiment, the HAMR head has a secondary waveguide having a first and second end positioned within the HAMR head. The secondary waveguide is positioned near the primary waveguide, and the first and second ends of the secondary waveguide are non-reflecting. A thermal sensor is coupled to the secondary waveguide, and responds only to optical power fluctuations in the primary waveguide. In another embodiment, the HAMR head has a second thermal sensor rather than a secondary waveguide. The first thermal sensor and the second thermal sensor are coupled together to act as one optical power sensor and are disposed on the primary waveguide.
Owner:WESTERN DIGITAL TECH INC
Radio Frequency Electric Field Proofreading Method and Device Based on Rydberg Atomic Quantum Coherence Effect
ActiveCN106842095BOvercome the disadvantage of large errorNo distractionElectrical measurementsRydberg atomLaser light
The invention relates to a radio frequency electric field correcting method and device based on a Rydberg atom quantum coherence effect, and aims to solve the technical problem that an existing electric field measuring method has large errors. According to the adopted technical scheme, a glass cesium bubble provided with a pair of parallel electrode plates is used as a cesium atom sample cell, cesium atoms form electromagnetically induced transparency under the action of probe light sent by two laser light sources and coupling light, the electromagnetically induced transparency has Stark frequency shift and split under the action of a radio frequency electric field and generates dipole sidebands at the Rydberg energy level modulated by the radio frequency electric field, multiple energy level cross points are formed in the Stark spectrum, each cross point serves as a datum point for correcting the electric field, each datum point corresponds to an accurate electric field value, and then the determined electric value is used for correcting the radio frequency electric field. The device is composed of a cesium atom sample cell, two laser light sources, a radio frequency source, a high-reflectivity reflector, a dichroic mirror and a photoelectric detector.
Owner:SHANXI UNIV
Resonant Fiber Optic Gyroscope Based on Coherence Effect of Double-Coupled Fiber Ring Resonator
The invention belongs to the technical field of fiber optic gyroscopes and especially relates to a double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope. The double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope solves the problem that the traditional resonant fiber optic gyroscope has low sensitivity and does not satisfy high sensitivity requirements of commercial airplanes, spatial orientation and navigation. The double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope comprises a laser, a polarization controller, a lithium niobate phase modulator, a first optical fiber coupler, a first optical fiber ring resonator, a second optical fiber coupler, a second optical fiber ring resonator, a third optical fiber coupler, a detector, and a signal processing and feedback system. The two optical fiber ring resonators prepared respectively from two optical fibers having different length are coupled and produce coherent effects and through measurement of a change of coherent resonant frequency of the two optical fiber ring resonators, a rate of angular motion is obtained. Compared with the traditional resonant fiber optic gyroscope having the same resonant optical fiber length, the double-coupling optical fiber ring resonator coherent effect-based resonant fiber optic gyroscope has sensitivity improved by dozens of times.
Owner:HARBIN ENG UNIV
Two-color all-optical switch based on cavity-induced coherence effect of quantum well intersubband transition
ActiveCN103928558BReduce energy consumptionImprove efficiencySemiconductor devicesSemiconductor materialsFar infrared
The invention discloses a double-color all-optical switch based on a quantum well inter-subband transition cavity-induced coherence effect, and belongs to the technical field of semiconductor materials. According to the structure of the double-color all-optical switch, an AlAs layer (2), a first barrier layer (3), a first quantum well layer (4), a second barrier layer (5), a second quantum well layer (6), a third barrier layer (7), a third quantum well layer (8), a fourth barrier layer (9) and a continuous area (10) sequentially grow on a substrate (1) made of GaAs materials, a cycle is from the first barrier layer (3) to the continuous area (10), six to fifteen cycles are arranged, and then a covering layer (11) and an air isolation layer (12) are provided. The double-color all-optical switch based on the quantum well inter-subband transition cavity-induced coherence effect can work at a medium-far infrared wave band, serves as a complete band gap switch of an infrared radiation source with low energy consumption and high efficiency, and has application value on the aspects of satellite detection and communication. The structure and materials of the double-color all-optical switch can be selected artificially, and the double-color all-optical switch has the advantages of easily achieving a wide wave band, miniaturization and integration.
Owner:JILIN UNIV
Spectrum generating device, measuring device and measuring method of physical quantity variation
ActiveCN107300355BReduce decoherence effectsHigh sensitivityUsing optical meansFiberFrequency spectrum
The invention discloses a frequency spectrum generation device and a physical quantity change amount measurement device and method. The device and method adopt an optical parametric oscillator in a compact structure to convert continuous single-frequency laser in an optical communication wave band into a squeezed light field in the optical communication wave band, thereby effectively reducing the de-coherence effect due to loss when the continuous variable squeezed light field transmits in an optical fiber, and maintaining compression degree to be maximum degree to allow the squeezed light field not to be damaged when transmitting in the fiber; and the squeezed light field in the optical communication wave band is injected to a vacuum channel of a fiber Mach-Zehnder interferometer, so that quantum precision measurement lower than shot noise limit is realized, and sensitivity of the fiber Mach-Zehnder interferometer is improved. The device is ingenious in structure, high in anti-interference capability and high in sensitivity, and is more suitable for measurement of tiny physical quantity change amount.
Owner:SHANXI UNIV
Accurate positioning method based on echo coherence effect
ActiveCN102505966BAchieve positioningHigh positioning accuracyMining devicesAmbiguitySelf correlation
The invention relates to the movable target positioning technology, in particular to an accurate positioning method based on the echo coherence effect, and solves the problem that the conventional underground personnel positioning technology has a high positioning ambiguity. The method comprises the following steps: (1), a detection waveform with a favorable self-correlation performance is designed; (2), an identification sensor sends a calling signal to an identification card carried by underground personnel periodically, and the identification card sends an echo signal to the identification sensor; (3), a coherence receiver receives the echo signal while moving unceasingly, and the detection waveform in the echo signal completely coincides with the detection waveform input in the coherence receiver when the coherence receiver moves to a position where the round-trip-delay of the echo signal is a specific value T; and (4), and the distance L between the identification sensor and the identification card is calculated out according to the round-trip-delay T. The method has the advantage that the problem that conventional underground personnel positioning technology has a high positioning ambiguity is solved, so as to be suitable for underground personnel positioning in a coal mine.
Owner:太原海斯特电子有限公司
Laser phase noise measurer
InactiveCN1866037BAvoid stabilityEasy to operateNoise figure or signal-to-noise ratio measurementElectrical testingBeam splittingPrism
Owner:SHANXI UNIV
Cooperative playback method, device, equipment and system
ActiveCN103442297BEnsure consistencyReduce learning costsVideo gamesSelective content distributionComputer networkWeb technology
The invention discloses a cooperative playing method, device, equipment and system, and belongs to the field of network technology. The method includes: establishing a predetermined connection with the target device; providing a target trigger signal to the target device through the predetermined connection, the target trigger signal is used to trigger the target device to play multimedia resources at a specified time, and the specified time corresponds to a local playing time; at the local playing time Play multimedia resources. The present invention provides a target trigger signal to the target device through a predetermined connection, and the target trigger signal is used to trigger the target device to play the multimedia resource at a specified time corresponding to the local playback time, and play the multimedia resource at the local playback time; thereby completing the multimedia on two devices The cooperative playback of resources solves the problem of high learning costs caused by ensuring the coordination and consistency of multiple electronic devices when playing multimedia resources; it achieves the effect of ensuring the coordination and consistency of multiple electronic devices when playing multimedia resources.
Owner:XIAOMI INC
Wire and cable material automatic weighing sealing and suturing device
ActiveCN104670569BImprove adaptabilityMeet packaging requirementsWrapper twisting/gatheringEngineeringElectric cables
Owner:CHANGSHU ZHONGLIAN PHOTOELECTRICITY NEW STUFF +1
Atomic gas concentration detection device and method based on optical coherent backscattering effect
InactiveCN103528994BRealize non-destructive testingPhase-affecting property measurementsElectricityCoherent backscattering
The invention discloses an atom gas concentration detecting apparatus and a method based on optical coherent backscattering effect. The atom gas concentration detecting apparatus comprises a laser aligner (1), a Glan-Taylor prism (2), a reflector (3), a depolarizing splitting prism (4), a sample beach (5), a Fourier lens (6), a polarization analyzer (7), a detector (8) and a computer (9); the laser aligner (1), the Glan-Taylor prism (2) and the reflector (3) are successively arranged on one same straight line along the transverse direction; the reflector (3) and depolarizing splitting prism (4) are arranged on one same straight line along the vertical direction; the sample beach (5) is arranged at one side of the depolarizing splitting prism (4), and the other side of the depolarizing splitting prism (4) is provided with the Fourier lens (6), the polarization analyzer (7) and the detector (8); the detector (8) is electrically connected with the computer (9) via data lines; and the detector (8) is arranged on the focal plane of the Fourier lens (6). The atom gas concentration detecting apparatus and the method help to realize nondestructive test on atom concentration of the atom gas in an enclosed gas room.
Owner:BEIJING INST OF RADIO METROLOGY & MEASUREMENT
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