750 results about "Wave transmission" patented technology

The invention, which relates to the technical field of offshore wave simulation, discloses a wave hydrodynamic numerical simulation method for a sea area with a breakwater, comprising the following steps: S1, determining a target sea area, and collecting sea chart data and water depth topographic data of the target sea area; s2, determining a shoreline position of the target sea area, and establishing a water depth terrain database of the target sea area; s3, setting grid precision, and constructing a wave hydrodynamic two-dimensional model of the target sea area; s4, setting boundary conditions for driving the wave hydrodynamic two-dimensional model, and setting initial parameters; and S5, based on the wave hydrodynamic two-dimensional model constructed in the S3, performing numerical simulation on the target sea area by using a sub-grid method to obtain the characteristic wave height and periodic data of the target sea area. According to the method provided by the invention, the calculation efficiency can be ensured, the wave transmission characteristics of the open type oyster reef are considered, and the influence of open type oyster reef construction on the wave hydrodynamic environment field can be accurately simulated.

Methods, systems, and devices for wireless communications are described. A network entity (e.g., a base station or reader) may transmit an initial access trigger message (e.g., modulating a continuous wave transmission using amplitude shift keying (ASK)), and the trigger message may include an indication of a type of passive user equipment (PUE) or a PUE use case (e.g., high priority / latency-critical PUEs or low priority / latency non-critical PUEs). A receiving PUE may harvest energy from the initial access trigger message for transmitting an initial access response message including an identifier for the receiving PUE. The receiving PUE may transmit the initial access response message (e.g., on one or more initial access resources) using the harvested energy if the trigger message indicates the PUE's type of PUE or PUE use case. In some examples, the receiving PUE may ignore triggers for different types of PUEs or PUE use cases.

The invention relates to a self-adaptive frequency optimization system in radio and television microwave transmission, and the system comprises an initial audio collection and processing module which collects an audio signal of a current frequency channel in real time, and generates a first data set; the conversion audio acquisition processing module synchronously acquires a target channel signal according to the frequency switching signal, and calculates the loudness offset between two channels; a feature extraction module extracts frequency domain energy distribution feature vectors of the first data set and the second data set; the model construction module constructs a dynamic gain compensation model and generates a compensation value of a target channel; the tone quality compensation module performs smoothing processing on the compensation value to generate an optimized third data set; and the audio optimization module updates model parameters, dynamically adjusts a frequency domain analysis strategy, and outputs low-delay and high-stability radio and television transmission signals. According to the invention, the problems of high switching delay and degraded tone quality caused by static configuration in a traditional scheme are solved, and the transmission efficiency and user experience in a complex electromagnetic environment are remarkably improved through modular dynamic calibration and compensation.

The invention relates to the technical field of power systems, and discloses a power distribution network fault positioning method, device and equipment and a medium, and the method comprises the steps: synchronously collecting fault traveling wave data through a transformer area intelligent terminal and a feeder terminal disposed in a power distribution network; dynamically calculating traveling wave transmission parameters based on the topological information and the real-time operation parameters of the power distribution network; performing feature extraction and fusion processing on fault traveling wave data acquired by the transformer area intelligent terminal and the feeder terminal to generate a joint feature matrix; based on the joint feature matrix and the traveling wave transmission parameters, cooperative verification is carried out through the single-end positioning information and the double-end positioning information, and a fault section is determined; and performing fault type identification on the fault section by using the intelligent classification model, and performing consistency verification according to an obtained fault type identification result and the fault section to generate a fault diagnosis result. According to the invention, accurate positioning of the power distribution network fault can be realized, and the problems of positioning blind areas, high cost and easy misjudgment in the prior art are solved.

The invention discloses a phased-array antenna, the phased-array antenna comprises a plurality of antenna module units, each antenna module unit comprises a PCB and an integrated radome module, and the integrated radome module is arranged on the surface of the PCB; a feed network, a dielectric substrate and an antenna radiation patch are arranged on the PCB, and the PCB is used for realizing feed and partial radiation functions; the integrated antenna housing module comprises a honeycomb support, an antenna patch, a PET film and an antenna housing, the antenna patch is etched on the PET film, the honeycomb support, the PET film and the antenna housing are mutually connected to form an integrated structure, and the integrated antenna housing module is used for realizing wave transmission, bandwidth broadening and impedance matching. According to the phased-array antenna, the use cost of PCB materials is reduced, and the problem that the electrical performance of the phased-array antenna is reduced due to dielectric loss caused by excessive use of PCB materials is solved.

The invention provides a high-reliability high-density three-dimensional integrated multichannel millimeter wave transceiving integrated radio frequency micro module, which adopts three-dimensional ceramic packaging as a packaging body and comprises an amplitude-phase unit and a transceiving unit, and the two units and a cover plate realize electrical vertical interconnection and airtight packaging through three-dimensional stacking. The micro module receives an input signal, the input signal enters a receiving channel after being selected by a switch, an amplitude-limiting low-noise chipset in the micro module carries out amplitude-limiting amplification on the received signal, then the received signal is output to an amplitude-phase multifunctional chip, and the received signal is synthesized and output after amplitude-phase adjustment and amplification. A transmitting input signal is input to the amplitude-phase multifunctional chip after being subjected to power division, is subjected to power amplification after being subjected to amplitude-phase adjustment and amplification, is selected by the transmitting-receiving switch, and is radiated and output through the antenna. A negative electricity protection circuit and a pulse modulation circuit are integrated in the micro module, and pulse control of transmitting and receiving work of the micro module is achieved. The micro module adopts a stepped heat dissipation technology of the chip, the substrate, the functional unit and the micro module, and has very strong practicability.

The invention provides a guide sheet structure, a base station antenna and a base station, and relates to the technical field of antennas. The guiding sheet structure comprises a first guiding sheet and at least one second guiding sheet, the first guiding sheet is provided with a through hole, the at least one second guiding sheet is arranged in the through hole, and the first end of the at least one second guiding sheet is fixedly connected with the first guiding sheet; the outer edge of the first guiding sheet is provided with at least one first branch knot, the at least one first branch knot extends along the outer edge contour of the first guiding sheet, and the at least one first branch knot is fixedly connected with the first guiding sheet; the first end of the second guiding sheet is provided with an opening, the opening extends in the extending direction of the second guiding sheet, and a second branch knot is arranged in the opening and extends in the extending direction of the second guiding sheet. The guide sheet structure has a wave-transparent characteristic, so that the bandwidth of a low-frequency antenna in the multi-frequency antenna can be expanded, wave transmission of a high-frequency antenna in the multi-frequency antenna can be realized, and the interference on the radiation performance of the high-frequency antenna is relatively low.

The invention belongs to the technical field of camouflage materials, and particularly relates to a thermal infrared low-radiation imitation green leaf multilayer film and a preparation method thereof. Comprising a substrate, a long-wave infrared regulation and control layer, a medium-wave infrared regulation and control layer and a green-leaf-imitating hyperspectral regulation and control layer which are arranged in sequence, the long-wave infrared regulation and control layer is stacked on the substrate according to a periodic structure of MHML, the medium-wave infrared regulation and control layer is stacked on the long-wave infrared regulation and control layer according to a periodic structure of (HM) 2L, and the green-leaf-imitating hyperspectral regulation and control layer is stacked on the medium-wave infrared regulation and control layer according to a periodic structure of (LM) 3 (HM) 3 (HL) (HM); h is a high-refractive-index material, M is a medium-refractive-index material, and L is a low-refractive-index material. Aiming at the problems of poor compatibility, large radar wave transmission influence, strict multi-layer film thickness control requirements and the like in the prior art, by optimizing the film system structure, the green-leaf-imitating hyperspectral camouflage characteristic is realized in the visible light-near infrared band, and the low-radiation performance is realized in the thermal infrared dual-band.

The purpose of the present invention is to facilitate confirmation that an affected part has been accurately irradiated with therapeutic ultrasonic waves in therapy using an ultrasonic therapeutic device. A control unit executes a therapeutic ultrasonic wave transmission process, an irradiation region image generation process, and a B-mode image generation process. The therapeutic ultrasonic wave transmission process causes an ultrasonic vibrator to transmit therapeutic ultrasonic waves. The irradiation region image generation process causes an ultrasonic probe to transmit a plurality of ultrasonic waves at different timings, synthesizes a plurality of received signals based on the plurality of ultrasonic waves that are reflected by biological tissue and received by the ultrasonic probe, and generates irradiation region data based on harmonic components of the received signals. The B-mode image generation process uses any one of the plurality of received signals to generate B-mode image data of the biological tissue.

The invention discloses an optical fiber signal transmission system and method based on quantum noise encryption, and relates to the technical field of optical fiber communication, and the system comprises a composite modulation transmitting module, a dispersion compensation relay module, a coherent receiving module and a digital signal processor. The composite modulation transmitting module comprises an electro-optical modulator and a quantum noise randomization encoder; the dispersion compensation relay module comprises an adjustable dispersion compensator and a Raman amplifier; the coherent receiving module comprises a local oscillator laser and a 90-degree optical mixer; a digital signal processor includes a clock recovery unit and a maximum likelihood sequence detector. All the modules are sequentially connected and cooperatively work. And the adjustable dispersion compensator dynamically applies reverse dispersion compensation calculated based on a dispersion coefficient and a transmission distance according to the dispersion amount monitored in real time. According to the invention, through technologies of quantum noise encryption, dynamic dispersion compensation, Raman amplification, coherent reception and the like, safe and efficient transmission with single-wave 400Gbps and 100km transmission bit error rate less than or equal to 1 * 10 <-12 > is realized.

A nonreciprocal microwave transmission device includes a substrate, a transducer on a surface of the substrate and configured to reciprocally convert between electrical signals to acoustic waves, a first piezoelectric material configured to generates and transports acoustic waves from a signal applied to the transducer, and a thin film magnetic material configured to couple to acoustic waves through magnetoelastic coupling so as to have non-reciprocal magnetoelastic coupled acoustic wave transport. Transmission of acoustic waves through the thin film magnetic material is in a direction toward the transducer has a first magnitude and transmission of acoustic waves through the thin film magnetic material in a direction away from the transducer has a second magnitude, the first and second magnitude being significantly different.

The invention discloses a wave hydrodynamic numerical simulation method for a sea area provided with a hedge shrub dam, and relates to the technical field of offshore wave simulation, and the method comprises the following steps: S1, determining a target sea area, and collecting actually measured water depth topographic data and chart water depth data of the target sea area, the target sea area being a salt marsh beach sea area where the hedge shrub dam is planned to be arranged; s2, setting grid precision, and constructing a wave hydrodynamic two-dimensional model of the target sea area by using a structured grid; s3, setting boundary conditions for driving the wave hydrodynamic two-dimensional model, and setting initial parameters; and S4, based on the wave hydrodynamic two-dimensional model constructed in the S2, performing numerical simulation on the target sea area by using a sub-grid method to obtain the characteristic wave height and periodic space-time distribution of the target sea area. According to the method, the calculation efficiency can be guaranteed, the wave transmission characteristics of the hedge shrub dam are considered, and the influence of construction of the hedge shrub dam on the wave hydrodynamic environment field can be accurately simulated.

To provide a transducer device capable of reducing the influence of reverberation vibration, and an exterior unit.SOLUTION: In a vehicle, a transducer device 100 as part of a sonar system that detects external objects, includes: a main unit 110 that is capable of transmission and reception of ultrasound; and an exterior unit 120 attached to the transmitting and receiving part of the main unit. The exterior unit has a first portion 1211 arranged to the tip of the transmitting and receiving part in contact therewith and a second portion 1212 arranged being spaced apart from the transmitting and receiving part. The main unit is a part constituting an ultrasound transducer, which has a transmitting and receiving part 111 formed in a cylindrical shape to transmit and receive ultrasound via the transmitting and receiving part. The distance between the second portion and the transmitting and receiving part is a distance that can be set appropriately, and that, when the transmitting and receiving part vibrates, it does not come into contact with the second portion.SELECTED DRAWING: Figure 4

The present disclosure provides a microwave transmission method and a single-input multiple-output waveguide microwave system based on frequency control, an electronic device. The method includes: adjusting frequency of an input microwave, each of different input microwaves with different frequencies being input microwave of the single-input multi-output waveguide microwave system; assigning the input microwave to a target output port among multiple output ports of the single-input multiple-output waveguide microwave system, according to the frequency of the input microwave; and performing microwave output through the target output port.

The invention discloses an ultra-wideband RCS (radar cross section) reduction metasurface with mixed wave absorption and diffuse scattering and a wave-transparent window, and belongs to the technical field of electromagnetic metamaterials. The metasurface adopts a four-layer cascade structure and comprises a first layer of polarization conversion structure, a second layer of 2.5 D lossy structure, a third layer of Jerusalem cross-shaped lossy structure and a fourth layer of frequency selective surface structure. By loading a lumped resistor at a specific position and adopting a metal through hole interconnection technology, dual functions of radar cross section reduction in a 1-20GHz ultra-wideband and low insertion loss wave transmission in a 8-12GHz frequency band are realized. The structure of each layer adopts a highly symmetrical design and has the characteristic of polarization insensitivity, and meanwhile, by optimizing interlayer air gaps and dielectric material selection, the structure compactness is realized on the premise of ensuring the performance. The method has important application value in the aspect of integration of stealth equipment and a communication system.

The invention relates to the technical field of aerospace, in particular to a ceramic 3D printing A sandwich structure with a broadband wave-transparent characteristic. According to the ceramic 3D printing A sandwich structure with the broadband wave transmission characteristic, good compatibility of broadband wave transmission, strength-structure accuracy and reliability is achieved, an obvious effect on broadband wave transmission of 1 GHz to 18 GHz is achieved, the dielectric constant and the tangent loss are in a reduction trend under the same frequency band, excellent stability is shown, and the dielectric constant and the tangent loss are reduced under 10 GHz. The dielectric constant of the ceramic 3D printing A sandwich structure with the broadband wave transmission characteristic is reduced by 40% or above compared with that of a full solid structure, the wave transmission rate is increased by 50% or above, the ceramic 3D printing A sandwich structure has excellent electromagnetic performance and mechanical performance, and support is provided for implementation of reliable service application targets such as diversion, heat protection, wave transmission, bearing and rain erosion resistance of hypersonic aircrafts.

The invention relates to the technical field of vibration and noise reduction, in particular to a two-dimensional spiral acoustic black hole structure which comprises a two-dimensional acoustic black hole configuration I and / or a two-dimensional acoustic black hole configuration II, the two-dimensional acoustic black hole configuration I is formed by rotating a one-dimensional spiral acoustic black hole structure around the long edge of a base of the one-dimensional spiral acoustic black hole structure, and the two-dimensional acoustic black hole configuration II is formed by rotating the one-dimensional spiral acoustic black hole structure around the long edge of the base of the one-dimensional spiral acoustic black hole structure. And the two-dimensional acoustic black hole configuration II is formed by rotating a one-dimensional spiral acoustic black hole structure around the short edge of the base of the one-dimensional spiral acoustic black hole structure. According to the two-dimensional spiral acoustic black hole structure provided by the invention, a one-dimensional spiral acoustic black hole is widened to a two-dimensional spiral acoustic black hole, so that more degrees of freedom are provided, a wave transmission path is allowed to be adjusted more flexibly, and the wave energy capturing capability of the two-dimensional spiral acoustic black hole structure is enhanced.

An apparatus is provided which comprises at least one processor, and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus at least to: receive a carrier wave transmission modulated by an ambient internet of things device in an ambient internet of things session, determine whether a received power of the carrier wave transmission is below a predetermined threshold; and in response to determination that the received power is below the predetermined threshold, prepare a notification requesting to control at least one carrier wave transmission characteristic such that the received power is increased, and transmit the notification to a carrier wave provider transmitting the carrier wave transmission or to a session control unit controlling the ambient internet of things session.

The invention provides a CEEMDAN-SSA-based power distribution network fault identification method, and the method comprises the steps: receiving a traveling wave signal of a power distribution network, and carrying out the preprocessing of the traveling wave signal; decomposing the preprocessed traveling wave signal by adopting CEEMDAN to obtain an intrinsic mode function component set, and selecting a high-frequency intrinsic mode function component from the intrinsic mode function component set; performing noise reduction on the high-frequency intrinsic mode function component by using singular spectrum analysis to obtain a pure fault feature signal; analyzing and reconstructing the frequency spectrum characteristics of the pure fault characteristic signal by using fast Fourier transform, and calculating the average frequency spectrum content of the low-frequency-band signal and the amplitude ratio of the high-frequency-band signal according to the frequency spectrum characteristics; and generating a fault identification result of the power distribution network by taking the average frequency spectrum content of the low-frequency-band signal as a main criterion and taking the amplitude proportion of the high-frequency-band signal as an auxiliary criterion according to the fault traveling wave transmission characteristics. Therefore, high-precision power distribution network fault identification can be realized in a complex working condition and a high-noise environment.

The invention discloses a millimeter wave security check method and device, equipment and a storage medium, and the method comprises the steps: determining a first person existence state based on an output signal of a correlation infrared sensor, and triggering a metal detector and generating a metal detection result when a person exists; controlling a millimeter wave emission module to operate based on the trigger signal and calculating a millimeter wave detection result; and determining a first security check result based on the metal detection result and the millimeter wave detection result, when the first security check result does not pass and the existence of people in the security check area is determined based on the correlation infrared sensor, regenerating a new millimeter wave detection result, and determining a second security check result based on the metal detection result and the new millimeter wave detection result. According to the invention, when the first security check result is not passed and the security check object is judged not to leave the security check area based on the correlation infrared sensor, the second security check result is determined by using the first metal detection result and the new millimeter wave detection result, the security check object does not need to leave the security check area, and the secondary security check process is simplified.

The invention belongs to the technical field of frequency selective surface radomes, and particularly relates to a frequency selective surface-based low-frequency wave-transparent and high-frequency reflection device and a satellite radome, which sequentially comprise a first low-pass layer, a first dielectric isolation layer, a first band-stop layer, a second dielectric isolation layer and a second low-pass layer from top to bottom, the first low-pass layer and the second low-pass layer are the same in structure, and each of the first low-pass layer and the second low-pass layer comprises first metal patch patterns which are periodically arranged; each first metal patch pattern is composed of four square ring patterns and a cross-shaped pattern, and the four ends of the cross-shaped pattern are connected with the four square ring patterns respectively; and the first band stop layer comprises second metal patch patterns which are periodically arranged. The novel low-pass layer / band-stop layer pattern multilayer structure is constructed, the effects of ultra-wideband low-frequency wave transmission and high-frequency reflection are achieved under the condition that the thickness is sacrificed, the problem that in-band ultra-wideband wave transmission and out-of-band ultra-wideband reflection are difficult to give consideration to in-band ultra-wideband wave transmission and out-of-band ultra-wideband reflection at the same time in existing frequency selection is effectively solved, and then normal work of a satellite antenna housing is guaranteed.

The utility model provides an on-line monitoring tube expansion prevention protection device for a round tube belt conveyor, and belongs to the technical field of conveyors. The online monitoring tube expansion prevention protection device for the circular tube belt conveyor comprises ultrasonic directional transmitters and ultrasonic directional receivers, the ultrasonic directional transmitters and the ultrasonic directional receivers are arranged on the two sides of the circular tube belt conveyor respectively, the number of the ultrasonic directional transmitters and the number of the ultrasonic directional receivers on each side are both two, and the number of the ultrasonic directional transmitters and the number of the ultrasonic directional receivers on each side are both two. The ultrasonic directional transmitter and the ultrasonic directional receiver which are in the opposite state are at the same height, and the ultrasonic directional transmitter, the ultrasonic directional receiver, the coal feeder and the round pipe belt conveyor are all connected with a round pipe belt conveyor PLC. According to the utility model, directional sound wave transmission and feedback receiving are combined with PLC control of the circular tube belt conveyor, so that the device has the advantages that the accumulation condition of materials in the rubber belt in the running and conveying process can be monitored on line in real time, and tube expansion is prevented fundamentally.

The invention provides a wave propagation characteristic prediction method and prediction device for a compact oil and gas reservoir, and the method comprises the steps: enabling a pore fluid in a compact oil and gas reservoir medium to be equivalent to a power law fluid, and obtaining a dissipation function of a fluid-pore-containing dual-phase medium for a non-Darcy flow seepage mechanism; standard linear body form popularization and fractional order derivative introduction are carried out on the three-dimensional isotropic body constitutive relation, and a system generalized force expression based on a fractional order viscoelastic mechanism is obtained; and finally, according to the combination of a dissipative function, a system generalized force expression and a Biot kinetic energy function with an Euler-Lagrange equation, obtaining a unified wave propagation model which aims at a tight oil and gas reservoir medium and simultaneously contains a non-darcy flow and a fractional order viscoelastic mechanism. According to the method, the propagation rule of the waves in the tight oil and gas reservoir medium can be finely described, and the accuracy of predicting the propagation characteristics of the waves and the accuracy of oil and gas reservoir medium parameter inversion calculation are improved.

An information processing device includes a first transmitter, one or more processors, and a recording medium. The first transmitter is configured to transmit first key-identifying information using a radio-frequency electromagnetic wave having a predetermined frequency, the first key-identifying information being linked to a predetermined vehicle. The recording medium stores a program configured to be executed by the one or more processors. The program includes one or more instructions configured to cause the one or more processors to perform a process to stop the first transmitter from transmitting the first key-identifying information when it is determined that the radio-frequency electromagnetic wave having the predetermined frequency has increased in intensity.

The invention discloses an electromagnetic ultrasonic transducer for GIL pipeline thickness measurement and a detection system. The electromagnetic ultrasonic transducer comprises a magnet assembly and a transduction coil. The magnet assembly is used for applying a vertical bias magnetic field to the to-be-tested GIL pipeline; the transduction coil is arranged on the strong side of the bias magnetic field of the magnet assembly and located between the GIL pipelines to be detected, when pulse current is introduced into the transduction coil, eddy current opposite to the direction of the pulse current in the transduction coil is formed in the side wall of the GIL pipelines to be detected, and the eddy current interacts with the vertical bias magnetic field to excite ultrasonic waves; ultrasonic waves reflected back from the GIL pipeline to be detected are received; the wiring end of the transduction coil is used for providing pulse current for the transduction coil and transmitting ultrasonic echoes received by the transduction coil to a detection system so as to detect the thickness of the side wall of the GIL pipeline to be detected.

The invention discloses a cell wide-spectrum detection method based on a terahertz artificial surface plasmon transmission line, and belongs to the field of cell wide-spectrum detection.The cell wide-spectrum detection method comprises the steps that the structure and size of the terahertz SSPP transmission line are designed, and a detection cavity packaged with the terahertz SSPP transmission line is prepared; connecting the detection chamber with a terahertz test platform, enabling the to-be-detected blood sample to flow into the detection chamber, and starting the test platform; the method comprises the following steps: irradiating an incident terahertz wave beam to the upper surface of a transmission line by using a high-resolution and large-dynamic terahertz frequency domain scanning test technology, efficiently coupling an incident terahertz free space wave with the transmission line, and exciting an SSPP wave with a high local characteristic on the surface of the transmission line; phase, amplitude and cut-off frequency data of an SSPP wave transmission spectrum are obtained, terahertz spectrum characteristics of cells are analyzed, and non-contact, unmarked and high-sensitivity detection and qualitative recognition of cell wide-spectrum information are achieved.

The invention provides a frequency selective surface unit with large-angle stability, the frequency selective surface unit comprises a dielectric layer, a first metal layer and a second metal layer, the dielectric layer is provided with a mounting part, and the mounting part is used for enabling two frequency selective surface units to be connected in a cross manner; the first metal layer is arranged on one side of the dielectric layer; the second metal layer is arranged on the side, away from the first metal layer, of the dielectric layer, and a capacitive structure or device is arranged on the second metal layer. According to the frequency selective surface device, the first metal layer can generate the electric response, and the second metal layer can generate the magnetic response, so that electromagnetic regulation and control can be performed on the frequency selective surface device with the crossed frequency selective surface units; the frequency selective surface device with the three-dimensional structure can have high selectivity of high wave transmission in the first working frequency band with relatively high frequency and high reflection in the second working frequency band with relatively low frequency, loss is low, and dual-polarization wide-angle stability is achieved at the same time.

The purpose of the present invention is to continuously and automatically measure the solidification position of a cast piece by preventing damage and burnout of an electromagnetic ultrasonic sensor caused by decrease in lift-off due to variation in the thickness of the cast piece, and preventing a decrease in sensitivity of the electromagnetic ultrasonic sensor caused by increase in lift-off. The present invention is provided with: electromagnetic ultrasonic sensors (7, 8) provided on the outside of a cast sheet (1); the sensor lifting unit is used for adjusting the interval between the casting piece (1) and the electromagnetic ultrasonic sensor (7); an interval measuring means for measuring the interval between the casting piece (1) and the electromagnetic ultrasonic sensor (7); a measuring unit that estimates the solidification position in the casting strip (1) from the output of the electromagnetic ultrasonic sensor (7); and a drive control unit that drives and controls the sensor raising and lowering unit and the interval measurement unit, and that controls the position of the electromagnetic ultrasonic sensor (7) by means of the sensor raising and lowering unit on the basis of the interval measured by the interval measurement unit.

The invention relates to a forming and surface treatment method of a twisted waveguide, and belongs to the field of metal additive manufacturing technology and surface treatment. The manufacturing technical problems that parting manufacturing precision and reliability are poor, torsional deformation and position tolerance of torsional forming are not easy to guarantee, and a welding position is prone to deformation are solved, and the problem that a twisted waveguide not plated with a copper layer is large in microwave transmission loss is solved. The method comprises the following steps: modeling a designed twisted waveguide, and completing support adding and slicing processing; aluminum alloy powder is added into a forming equipment material cylinder; performing selective laser melting forming by adopting the slice file to obtain a twisted waveguide with a substrate and a support; separating the twisted waveguide from the substrate and the support; carrying out finishing processing on the twisted waveguide by adopting chemical polishing; and plating the twisted waveguide by adopting chemical plating to obtain the twisted waveguide with the plating layer. The additive manufacturing integrated forming and surface treatment process is adopted, the production period is effectively shortened, the product quality reliability is improved, and the microwave transmission loss is reduced.

An obstacle detection device according to the present disclosure includes: a transmission circuit, which, in operation, transmits a transmitted wave signal subjected to frequency modulation; a reception circuit, which, in operation, receives a signal externally; an object detection circuit, which, in operation, detects an object existing in a wave transmission direction of the transmitted wave signal, based on a reflected wave of the transmitted wave signal received by the reception circuit; an interference detection circuit, which, in operation, detects, as interference, another transmitted wave signal transmitted from another transmission circuit different from the transmission circuit, based on the signal received by the reception circuit; and a determination circuit, which, in operation, determines a frequency modulation pattern to be applied to the transmitted wave signal and a transmission timing of the transmitted wave signal, based on detection results of the object detection circuit and the interference detection circuit.