171 results about "Reflected waves" patented technology

A radar device which is installed in a vehicle or the like needs to detect a target at a short distance from several tens of centimeters to several tens of meters and, therefore, has a problem that a reflected wave from the target may be reflected by a front case of the radar device and then reflected by the target again to be received as a secondary echo by itself. To solve this problem, it is an object of the present invention to provide a radar device again that can prevent multi-reflection to accurately measure a distance to a target in a short range. In a radar device according to the present invention, a surface of a frame body provided around a transmitting antenna and a receiving antenna is shaped so that a reflected wave from a target may not be returned in a direction in which a transmitting wave is transmitted from the transmitting antenna.

The present application relates to a kind of ground penetrating radar detection and disease treatment method for deep high pressure tunnel, and the field measuring line is the net structure of two horizontal and two vertical, radar transmitting antenna continuously emits pulsed high frequency electromagnetic wave to underground, receiving antenna receives the reflection wave and transmission wave generated by interface or target body with electrical difference, the property of target body is determined according to the form, strength and its change of radar map reflection wave, and forecast is formed;Forecast content includes four aspects of whether there is broken rock stratum in the surrounding rock in front of working face, whether there is water-rich rock stratum in the surrounding rock in front of working face, whether there is the possibility of water or mud inrush in the surrounding rock in front of working face, and fault fracture zone and its water content in front of working face;Treatment scheme is formulated according to forecast content, combined with engineering profile summary, survey and construction design document and construction specification.

A sensing system (50) that can image a phase change medium comprises: a transmission device (10) that generates a radar signal, generates a code, generates a carrier signal, generates a high-frequency signal by using the carrier signal and a multiplication signal obtained by multiplying the radar signal by the code, and transmits the high-frequency signal from a plurality of transmission antenna elements (18); a reflection plate (22); and a reception device (30) that receives, by a plurality of reception antenna elements (32), a high-frequency signal that is a reflected wave reflected by the reflection plate (22) or a measurement target (21) that is a phase change medium, or a scattered wave scattered by the same, converts the high-frequency signal into a baseband or intermediate-frequency reception signal, generates transmission path information from the reception signal by using the radar signal, the carrier signal, and the code, identifies the position of the measurement target (21) by using the transmission path information, corrects the focal point of the measurement target (21), determines the phase change of the measurement target (21), and generates an image of the measurement target (21).

The application discloses a kind of based on acoustic wave detection and wave field separation building structure safety detection method and device, it is related to acoustic wave detection and safety detection technical field.The method includes obtaining initial acoustic wave detection data and carrying out acoustic wave travel time analysis, the spatial distribution range of preliminary determination internal abnormal area;For the range, increase observation density and obtain local enhanced detection data;Wave field separation is carried out to data in space domain and time domain, filter out surface wave and oblique incidence interference wave, extract vertical reflection wave data;Based on vertical reflection wave data, three-dimensional acoustic imaging is carried out, and the spatial positioning feature and geometric profile of abnormal area are obtained;Safety evaluation model is combined to carry out safety evaluation to target detection area.The present application can effectively peel off complex interference wave field, improve abnormal body spatial positioning precision and safety evaluation reliability.

The present invention relates to a system (10) for guiding an aircraft, comprising: - an imaging chain (14) configured to reconstruct an image of the external environment; - a monitoring chain (16) configured to detect obstacles in the path of the aircraft; - a radar module (12); - a management module (31) configured to control the radar module (12) between a monitoring operation mode and a hybrid operation mode; - a post-processing module (32) configured to process reflected waves in order to transmit signals corresponding to the imaging waves to the imaging chain (14) and / or transmit signals corresponding to the monitoring waves to the monitoring chain (16).

This invention discloses a TDR-based system and method for measuring the thickness of multilayer dielectric materials, relating to the field of microwave testing technology, enabling thickness measurement of multilayer dielectric materials in a non-destructive environment. The system includes: a vector network analyzer, an antenna module, and a metal calibration plate. The vector network analyzer emits microwave pulses at a set frequency to the multilayer dielectric material under test. The antenna module focuses the reflected waves generated by the microwave pulses as they pass through the multilayer dielectric material. The metal calibration plate is placed on the starting layer of the multilayer dielectric material to generate the first corresponding time-domain signal reflection peak when the microwave pulse is incident, thus locating the starting position of the multilayer dielectric material. The vector network analyzer also acquires the frequency-domain signal focused by the antenna module, performs a Fast Fourier Transform on the frequency-domain signal to obtain a time-domain signal, calculates the time-domain signal based on the starting position, and outputs the thickness parameters of each layer in the multilayer dielectric material under test.

A displacement sensing device includes a wave transmitter that transmits a modulated wave having a plurality of frequencies to an object, a wave receiver that receives a reflected wave from the object and generates a reception signal indicating a reception result, and a control section that controls transmission of the modulated wave by the wave transmitter and acquires the reception signal from the wave receiver. The control section outputs a first transmission signal to the wave transmitter to cause transmission of the modulated wave in a first measurement period, acquires a first reception signal in response thereto, extracts first phase information indicating a phase specified in correlation between the first transmission signal and the reception signal, outputs a second transmission signal to the wave transmitter in a second measurement period following the first measurement period, acquires a second reception signal in response thereto, extracts second phase information indicating a phase in correlation between the second transmission signal and the reception signal, and senses displacement of the object in the first measurement period and the second measurement period based on a difference between the first phase information and the second phase information.

This invention belongs to the field of seismic exploration, specifically relating to a method for calculating minimum offset and delay based on direct waves and seafloor reflected waves. The method includes: selecting single-shot seismic data from a flat seafloor location, picking the direct wave travel time, and picking the seafloor reflected travel time of the first data trace at the single-shot location; performing regression fitting on the picked direct wave travel time to fit the direct wave equation, and obtaining the seawater velocity and initial minimum offset based on the direct wave equation; setting an initial delay time range, and calculating the seafloor depth h for each seismic trace at different delay times based on the seawater velocity, initial minimum offset, and seafloor reflected travel time; calculating the 2h variance based on the seafloor depth of the seismic trace, and obtaining the minimum offset and delay time. This invention can quickly obtain the minimum offset and delay time, achieving accurate positioning of seismic data, and the method is simple and easy to implement.

The application provides a system for adjusting a light beam, which can be applied to an optical system with high requirements for a reflected wave front. The system comprises a mirror, a surface shape detection device, a calculation and analysis device, and a compensation light generating device. The mirror is used to receive incident light from a first light source and emit reflected light. The surface shape detection device is used to obtain information about an initial surface shape of the mirror after the incident light is incident. The calculation and analysis device is used to generate first indication information according to the information about the initial surface shape, the first indication information indicating that the compensation light generating device emits first compensation light to the mirror. The compensation light generating device is used to emit the first compensation light to the mirror according to the first indication information, the first compensation light being used to change the initial surface shape of the mirror into a first surface shape. The system of the application not only can maintain the wave front of the reflected light, but also can improve the accuracy of regulating and controlling the direction and divergence angle of the reflected light.

This invention discloses a thin-layer weak signal enhancement method based on cyclic spectrum enhancement technology. The method first preprocesses the original seismic data using a Gaussian smoothing operator to suppress random noise while preserving the main signal features. Then, even-order derivative operations are introduced to enhance the high-frequency components and detailed information of the seismic signal, highlighting the reflection characteristics of the thin-layer interface. To address the issue of high-order derivatives easily introducing high-frequency noise, a Butterworth low-pass filter is used for directional noise reduction. Finally, an adaptive cyclic termination condition is used to determine the optimal derivative order, and the derivative seismic traces are superimposed onto the original seismic traces to achieve thin-layer weak signal enhancement. Numerical simulations and tests with actual seismic data show that this method can effectively enhance the weak signals of 10m (λ / 4) and 5m (λ / 8) thin layers, improve the continuity and clarity of the phase axis of thin-layer reflected waves, and thus enhance the identification capability of thin-layer reservoirs under complex geological conditions.

The present disclosure relates to the technical field of cable detection engineering, and particularly relates to a cable insulation damage monitoring method and device based on a distributed magnetic sensor. The method comprises the following steps: injecting a cable insulation damage detection signal into a to-be-detected cable; collecting a group of reflected wave signals and a group of refracted wave signals corresponding to the cable insulation damage detection signal by using a distributed magnetic sensor group arranged on the to-be-detected cable; and inversely solving a defect damage coefficient and a defect position coefficient according to the group of reflected wave signals and the group of refracted wave signals, so as to obtain a cable insulation damage monitoring result of the to-be-detected cable. The present disclosure can realize online fine monitoring of cable insulation damage in a non-invasive and distributed manner.

A defect detection method is provided for a pressurized pipe having at least one defect. According to the method, an acoustic source generates a probing wave of a frequency range from 10 kHz to 100 kHz, where the probing wave is scattered by the at least one defect to create a reflected wave; an acoustic receiver measures a wave response to obtain a measured response, where the measured response is attributed essentially to a superposition of the probing wave and the reflected wave; and a computer device processes the measured response to locate the at least one defect.

This disclosure relates to a method, apparatus, and product for full-waveform reflection inversion based on dynamic graphic warping, applicable to the field of seismic exploration technology. In this disclosure, seismic data of the target area is acquired; wavefield simulation is performed based on the seismic data to determine the background wavefield and scattered wavefield. Based on dynamic graphic warping, full-waveform reflection inversion is performed on the background wavefield and scattered wavefield to determine the inversion target model. The inversion target model is optimized to determine the target image of the target area. Determining the inversion target model through the dynamic graphic warping algorithm can improve the resolution of the inversion target model and reduce the model's ambiguity and computational load. Furthermore, iterative optimization of the inversion target model can improve imaging quality. Simultaneously, using the dynamic graphic warping algorithm can reduce the accuracy requirements of high wavenumber models, enabling more accurate imaging of complex geological features. Therefore, the accuracy of imaging is improved.

The application discloses a gypsum board foaming compound control system, which comprises a foaming agent feeder, a visual cutting machine, a visual detector, an ultrasonic detector and a controller arranged in a gypsum board production line. The visual cutting machine is used for cutting a wet board. The visual detector measures the size of the cell of the cross section of the wet board through an observation window arranged on the execution part of the visual cutting machine. The ultrasonic detector emits ultrasonic waves to the slurry and derives the size and growth speed of the bubbles in the slurry through the reflected wave signals. During the production process, the controller adjusts the process of deriving the cell size by the ultrasonic detector according to the size of the cell measured by the visual detector, and adjusts the feeding ratio of the foaming agent feeder according to the size of the cell derived by the ultrasonic detector. The foaming agent used by the slurry is produced in real time by the foaming agent feeder according to the set feeding ratio, so that the feeding ratio of the foaming agent can be timely and accurately changed according to the size of the cell in the gypsum board.

The application discloses a kind of through type radio frequency microwave vector analysis device and method, device includes radio frequency front end and down conversion module, digital acquisition and processing module and control and interactive module.Radio frequency front end and down conversion module are used for the transmission of radio frequency signal, two-way coupling sampling and coherent down conversion;Digital acquisition and processing module are used for collecting signal and processing, obtain pure incident wave signal and reflected wave signal;Control and interactive module are used for controlling each module, and carry out man-machine interaction.The application is realized by using through type measurement architecture, under the premise that the signal transmission of measured system is not interrupted, realizes the online vector analysis of radio frequency signal, and does not need built-in signal source, and then complete vector parameter such as reflection coefficient, impedance, standing wave ratio can be accurately calculated.

The subject matter of this specification may be embodied in, among other things, a position sensor system comprising a fluid effector including a housing having an inner surface defining a cavity, a movable body having a first surface and a second surface opposite to the first surface and configured to contact the inner surface and subdivide the cavity to define a first chamber and a second chamber, an acoustic transmitter system configured to transmit a first transmitted waveform toward the first surface and a second transmitted waveform toward the second surface, and an acoustic receiver system configured to detect a first reflected waveform based on a first reflection of the first transmitted waveform, the first reflection of the first transmitted waveform being based on the movable body, and to detect a second reflected waveform based on a second reflection of the second transmitted waveform, the second reflection of the second transmitted waveform being based on the movable body.

The application provides a radio interference source automatic positioning and troubleshooting system and method thereof, the radio interference source automatic positioning and troubleshooting system comprises a front-end hardware enhancement module, a core algorithm optimization module and a system-level cooperative positioning module, the radio interference source automatic positioning and troubleshooting method comprises hardware deployment and preprocessing, spatial domain beamforming and subarray combination, digital domain multipath elimination and signal recovery and the like, the radio interference source automatic positioning and troubleshooting system and method thereof provided by the application effectively solve the problem that the traditional equipment cannot distinguish the direct wave from the reflected wave, so that the direction finding result is seriously deviated or even points to the wrong direction, and greatly improve the accuracy and reliability of the direct wave identification of the signal.

To provide a compact sensor that detects the movement of an object in a 360-degree plane around the sensor. [Solution] The system includes a sensor module 50 that emits radio waves in a specific direction and detects the movement of an object based on the reflected waves of the emitted radio waves, and an antenna 51 that radiates the emitted radio waves in a 360-degree direction on a plane centered on the sensor. The antenna includes a conical reflector 68 that splits the radio waves into two directions, a slit 69 that allows radio waves traveling in a specific direction to pass through, an opening 70 that radiates the radio waves split into two directions, and first fins 71 and second fins 72 that adjust the angle of the radio waves radiated from the opening. The shielding plates 66 provided above and below compress the vertical direction and increase the gain of the radio waves radiated in the horizontal direction.

The application discloses a radio frequency fascia layer thermal effect lifting system and method based on an anti-gravity vector, and belongs to the technical field of skin care and beauty. An initial impedance distribution diagram of a target skin area is acquired, a detection radio frequency wave is emitted, and a relative dielectric constant offset of a fascia layer relative to an epidermis layer and a dermis layer is extracted from a reflected wave signal. The offset and a depth arrangement order are input into an anti-gravity vector calculation unit, an anti-gravity vector sequence is calculated and generated, radio frequency waveform parameters matched with the vector sequence are called from a waveform database, and are loaded to a phase control array. The surface temperature and impedance changes of the target skin area are monitored in real time, impedance fluctuation feedback values are generated, and the beam pointing adjustment parameters in the subsequent anti-gravity vector are dynamically corrected accordingly until the thermal effect area construction of all target points is completed. The application accurately controls the radio frequency beam pointing through the anti-gravity vector, realizes accurate and orderly heating of the subcutaneous fascia layer, and has self-adaptive correction capability.

The application relates to the technical field of fault positioning, and discloses a wind farm buried cable fault positioning method based on a traveling wave positioning method, which comprises the following steps: coupling a fault traveling wave signal, collecting and generating a head-end fault waveform data set, performing high-pass filtering and differential processing on the output edge enhanced waveform, comparing the output edge enhanced waveform with a reference voltage to generate a rising edge signal, and then locking the wind farm traveling wave arrival time; sliding matching a standard reflected waveform template with the head-end fault waveform data, intercepting a fault point reflection segment, and taking the first geometric length from the cable head end to the nearest branch point as a reference to construct a first propagation path and a second propagation path of the traveling wave propagation; eliminating the traveling wave speed variable by using the time length relationship between the first propagation path and the second propagation path, matching the obtained continuous length value to the physical topological structure of the wind farm, and outputting a cable section where the fault point is located as a final positioning result; and the application can improve the efficiency of the wind farm buried cable fault positioning.

Monitoring a region to detect an intruder may comprise, in an embodiment, receiving a first set of Ranging Active Reflective Wave Detector (RARWD) measurements; obtaining a reference entrance-behaviour based on the first set of RARWD measurements, the reference entrance-behaviour defining a normal human transit behaviour through at least part of a region; receiving a second set of RARWD measurements to monitor for an intruder; determining from the second set of RARWD measurements a current entrance-behaviour of a person; determining whether the current entrance-behaviour of the person has a requisite correlation with the reference entrance-behaviour to determine whether a normal entrance-behaviour condition is satisfied; and controlling output indicative of whether the normal entrance-behaviour condition is determined to be satisfied. The second set of RARWD measurement may be used to track the spatial location of the person to determine the current entrance-behaviour of the person.

The present application relates to a kind of well seismic signal-noise superposition wave field high-dimensional multi-component feature intelligent separation method, belong to geophysical oil and gas resource exploration field.Establish time-domain multi-component decomposition result serves different dimension differentiation characteristic property expression;Six-dimensional characteristic attribute space based on multi-component signal-noise component is established, and the mathematical characteristics of complex signal wave and multiple types of noise in DAS record, such as direct wave and reflected wave, are revealed;Dual-stage highly integrated framework with tree model as base learner is set up to complete the feature point category determination separation task in high-dimensional attribute space, so as to accurately and efficiently realize low-damage preservation of signal wave field and maximum suppression of noise wave field.The method is flexible, accurately preserves the amplitude characteristics and frequency energy components of DAS two-dimensional exploration record signal field in well, the mathematical basis is reliable and reliable, and the feature is strongly interpretable, which provides an important basis for thin and fine layer detection, oil and gas reservoir exploitation and other practical applications.

The application relates to an anchor rod length detection auxiliary device and an anchor rod structure. The application is suitable for the technical field of anchor rod quality detection. The application aims to solve the technical problem of providing an anchor rod length detection auxiliary device and an anchor rod structure. The application adopts the technical scheme that the anchor rod length detection auxiliary device comprises a concave end cap, the concave end cap can be installed at the rock-entering end of the anchor rod, the concave end cap is made of polyethylene, and the interface between the concave end cap and the rock-entering end of the anchor rod can facilitate the emergence of a reflected wave form.

The application discloses a kind of one-dimensional force electric characteristics of concrete test piece and system, it is related to the cross field of detection and intelligent sensing technology of civil engineering material dynamic mechanical property.Testing method includes the following steps: S1: using one-dimensional Hopkinson pressure rod experimental device to the concrete test piece pre-embedded piezoelectric sensor is axially impacted loading, obtains incident wave signal, reflection wave signal and transmission wave signal;The current and voltage corresponding to the resistance obtained in parallel to the two ends of piezoelectric sensor;S2: obtaining the one-dimensional stress-strain curve of concrete test piece;S3: based on current and voltage, the charge amount generated by piezoelectric sensor is obtained;S4: the impact velocity of impact rod is changed and the stress-charge amount variation curve is obtained by repeating steps S1-S3.Getting the axial stress of concrete test piece and the charge amount output by piezoelectric sensor simultaneously, constructs stress-charge amount relationship curve, realizes the quantitative calibration of dynamic sensitivity.

The invention provides a control device capable of improving the accuracy of defect detection. [Solution] The control device 7 controls an ultrasonic inspection device 100 that ultrasonically inspects an object to be inspected 5 by irradiating it with ultrasonic waves and receiving reflected waves, and includes an acquisition unit 71 that acquires a first reflected signal received from a first ultrasonic irradiation position on the object to be inspected 5 and a second reflected signal received from a second ultrasonic irradiation position on the object to be inspected, the distance between the second irradiation position and the first irradiation position being shorter than the beam diameter of the ultrasonic waves on the surface of the object to be inspected 5, and an integration unit 72 that integrates the first reflected signal and the second reflected signal to generate an integrated reflected signal.

The invention relates to a radar sensor device (3) for a motor vehicle (1), comprising a housing (4) and a radar sensor (5) for emitting waves (XS) and for receiving reflected waves (XR). The housing (4) comprises a radome region (6) and an absorber region (7). The absorber region (7) is designed with a lower permeability for the waves (XS, XR) than the radome region (6). The absorber region (7) surrounds the radar sensor (5) in a circumferential direction and, together with the radar sensor (5), divides a gas-tight inner chamber (8) of the housing (4) into a first inner chamber region (9) and a second inner chamber region (10). The first inner chamber region (9) is delimited by the radar sensor (5), the absorber region (7) and the radome region (6) and is shielded from the outside environment (11) by the radome region (6). The second inner chamber region (10) is delimited on a side of the radar sensor (5) facing away from the first inner chamber region (9) by the radar sensor (5) and the absorber region (7) and a further housing region (12). The radar sensor (5) comprises at least one component (14, 15) which emits waste heat into the inner chamber (8). The absorber region (7) is configured with at least two channel regions (16, 17) for exchanging a gaseous fluid between the inner chamber regions (9, 10).

Various aspects of this disclosure relate generally to wireless communication. In some aspects, the reflecting device can generate a multi-peaked reflection beam that spatially multiplexes a first reflected signal of a first signal and a second reflected signal of a second signal. The reflecting device can receive the first signal and the second signal. The reflecting device can use the multi-peaked reflection beam to reflect the first signal and the second signal to output a spatially multiplexed reflected signal. Numerous other aspects are described.

A method for activating a vehicle function, by way of an activation device, based on a visual recognition of a user. The activation device including at least one camera oriented toward the outside of the vehicle and equipped with visual recognition, and at least one ultra-wideband transceiver for detecting a presence inside the vehicle. The transceiver being modified to allow transmission to the outside of the vehicle at different refresh rates. The method includes: transmitting to the outside of the vehicle at a first refresh rate; receiving the reflected waves; detecting presence in a predetermined area around the vehicle; adapting the refresh rate according to a distance between the presence and the vehicle; activating the camera only when the presence is detected at a distance below a threshold value; identifying the presence by way of visual recognition; if the presence is identified as being the user, activating the vehicle function.

This invention discloses a passive RFID tilt detection method based on a transceiver separation architecture, comprising the following steps: acquiring a continuous wave radio frequency signal from an RF exciter; collecting a mixed signal containing a passive tag reflected wave and an RF exciter leakage wave, and simultaneously acquiring a self-interference reference signal; performing self-interference cancellation processing on the mixed signal based on the self-interference reference signal, and extracting the tag backscattered signal; when a dual-tag array is used, measuring the phase of the passive tag array separately and calculating the phase difference, calculating the initial tilt angle of the target object, and obtaining the final tilt angle after correction; when a single passive tag is used, extracting the phase data of the single passive tag and performing linear interpolation, and substituting the interpolated real-time phase into a linear model to calculate the tilt angle. This invention can effectively eliminate transceiver self-interference and automatically offset the influence of distance changes on angle measurement accuracy, significantly improving the robustness and accuracy of object tilt detection.