365 results about "Standing wave" patented technology

The invention relates to the technical field of hemispherical harmonic oscillator assembly, in particular to a welding method and device for an assembled hemispherical harmonic oscillator, and the device comprises a vibration welding platform and a clamping assembly located above the vibration welding platform; the vibration welding platform is used for bearing the sensitive base and providing a thermal field and a vibration field needed by welding, and the clamping assembly is used for clamping the center shaft and sending the center shaft into a center hole of the base. A heating unit and a composite vibration ultrasonic transducer are arranged in the platform, and the platform is configured to apply high-frequency vibration formed by superposition of vertical longitudinal waves and horizontal torsional waves to the base. The high-frequency vibration thixotropic effect is used for reducing the viscosity of the molten solder, the ultrasonic cavitation effect is used for forcibly discharging bubbles at the bottom of the blind hole, and the sound radiation pressure generated by the vibration standing wave field is used for driving the center shaft to achieve friction-free self-centering in the hole. According to the device, the problems of air bolt pseudo soldering and rigid assembly clamping stagnation in the traditional process are solved, and the assembly coaxiality and the connection strength of the harmonic oscillator are remarkably improved.

The invention discloses an intelligent regulation and control method and system for the environmental comfort degree of a central air conditioner terminal, and relates to the technical field of air conditioner regulation and control. The intelligent regulation and control method comprises the following steps that a pressure fluctuation track generated by aerodynamic disturbance is collected in the operation process of a draught fan, and the pressure fluctuation track is converted into energy spectrum distribution in a time sequence; establishing dynamic energy representation of the fan frequency; based on dynamic energy representation of fan frequency, a sound vibration field is projected in a spatial range, excitation response of inherent frequency is synchronously recorded through a room structure sensing array, and instantaneous energy coupling fingerprints of a room structure are formed. Through dynamic energy characterization and structural response coupling analysis, real-time identification and quantitative control of the standing wave noise risk are realized, a phase drift mechanism is introduced at a risk critical point, a fan disturbance phase is actively adjusted, standing wave superposition is effectively blocked, and acoustic safety and operation stability of a tail end environment are improved.

The invention discloses a college dormitory noise multi-dimensional evaluation method based on psychoacoustic and sound field simulation, and belongs to the field of building environment and noise control. The objective of the invention is to solve the problem that an existing dormitory noise evaluation method is single in index and neglects subjective perception and spatial distribution heterogeneity. The method comprises the following steps: acquiring physical data and original audio of dormitory noise through multi-point synchronous acquisition; calculating loudness, sharpness, roughness, fluctuation intensity and comprehensive psychoacoustic annoyance (PA) by using a psychoacoustic model, and scientifically quantifying subjective interference of noise; meanwhile, sound field simulation is carried out based on the accurately established three-dimensional dormitory model, a sound pressure level distribution cloud picture is generated, and a standing wave phenomenon and a sound energy accumulation area are visually revealed; and finally, generating a targeted noise reduction optimization strategy by integrating subjective and objective and spatial analysis results. According to the method, full-chain diagnosis of physical characteristics-subjective perception-spatial distribution of dormitory noise is realized, and a scientific basis is provided for accurate and efficient noise treatment.

The invention discloses a billiard training auxiliary system and method based on an intelligent mirror, and the method comprises the steps: collecting a user action sequence and spatial position data through the intelligent mirror, recognizing a key supporting point and the rod-out straightness, building a body gravity center track, and generating an action coupling coefficient; reversely tracking and identifying an action instability source based on a coupling coefficient, forming an amplification path through error cascade amplification analysis, and constructing a deviation topology network; carrying out singular point analysis on the deviation network to extract skill aggregation nodes and loss nodes, constructing a skill gradient field according to a potential energy difference, identifying a phase change critical point, and positioning a mirror image inversion correction area; reconstructing a standard action sequence by using a correction region, constructing a panoramic recording matrix, extracting a view angle node, and outputting progressive action guidance; monitoring a skill response waveform to identify a resonance peak point, and constructing a skill standing wave field to generate a personal skill map; and carrying out intelligent mirror-based billiard training assistance on the basis of the personal skill map. Therefore, the pertinence and effectiveness of training are improved.

The invention discloses an electric forklift gantry synchronous inclination system and an inclination system control method, and relates to the technical field of vehicle engineering and electrical control, and the method comprises the following steps: establishing a time-frequency phase-locked observation baseline, and calibrating an abnormal trigger window by collecting a pressure wave change track of the gantry synchronous inclination system under a reverse pressure bearing condition; generating a pressure wave characteristic fingerprint and a time delay matrix as dynamic references for resonance path identification; and according to the pressure wave characteristic fingerprints and the time delay matrix, inverting a hydraulic pipeline reflection topology, identifying a pressure energy concentration area, extracting a resonance source anchor point, constructing a wave energy distribution diagram, and forming a space positioning basis of the standing wave risk. According to the method, hydraulic standing wave risk modeling and boundary extraction are achieved through time-frequency observation and resonance path recognition, a standing wave damping structure is constructed in combination with the phase conjugate test and track shaping technology, steady-state damping and high-precision synchronous inclination control of the portal under reverse pressure bearing are achieved, and the system stability and operation safety are improved.

The invention provides a leakage cable, which comprises an inner conductor and an insulator, and is characterized in that the insulator sleeves the outer side of the inner conductor; the outer conductor sleeves the outer side of the insulator, the outer conductor is provided with a plurality of leakage grooves and a plurality of leakage holes along the axis direction of the leakage cable, the leakage grooves and the leakage holes all penetrate through the side wall of the outer conductor, the leakage grooves are of strip-shaped structures, and the leakage grooves and the leakage holes are arranged crosswise along the axial direction of the leakage cable. By applying the technical scheme of the invention, the problems of high standing wave performance and limited application bandwidth of the leaky cable in the prior art can be solved.

The invention discloses an intelligent simulation analysis method and system for standing wave characteristics and safety performance of an automobile tire, and relates to the technical field of intelligent simulation analysis and automobile safety. The intelligent simulation analysis method and system for the standing wave characteristic and the safety performance of the automobile tire comprises the following steps that S1, multi-dimensional simulation driving data are obtained and preprocessed; s2, reconstructing a tire structure response based on the preprocessed multi-dimensional simulation driving data, and measuring the intense degree of the structure response; s3, simulating tire temperature change in combination with a temperature rise simulation process, and judging whether temperature rise abnormity exists in the local area or not; and S4, carrying out space overlapping comparison on the structure response abnormity and temperature rise abnormity areas, and identifying a space overlapping state. The problems that a tire local high-temperature area and a standing wave high-response area are overlapped to cause structural instability easily, recognition is difficult to achieve in advance in the prior art, the monitoring mode is based on the overall trend, and a recognition and early warning mechanism for the local overlapping situation is lacked, so that the tire burst risk is difficult to perceive in time are solved.

A standing wave radar includes: a transmitter to set a frequency of a transmission signal to frequencies, and output the transmission signal taking the respective frequencies in a time-division manner; a receiver to receive a reflected signal taking the frequencies in a time-division manner, the reflected signal being the transmission signal reflected by an object; and a processor to obtain reflection coefficients of the frequencies by obtaining each reflection coefficient of the transmission signal and the reflected signal taking a same frequency, for the transmission signal and the reflected signal taking the frequencies, and to execute a first inverse Fourier transform process of calculating a first distance spectrum for the object by an inverse Fourier transform on the reflection coefficients, and a first distance measurement process of determining presence of the object and calculating a distance to the object, based on the first distance spectrum.

This freeze-drying device (100) heats and dries a freeze-dry sample (S) and comprises: a vacuum container (101) in which the freeze-dry sample (S) is stored; a cavity resonator (102) in which the vacuum container is stored; and a microwave generator (103) that projects microwaves (electromagnetic waves) into the cavity resonator. The cavity resonator forms, from the microwaves, a standing wave that does not resonate with water but can resonate with ice.

The utility model relates to a phase change thermo-acoustic engine experimental device which comprises a thermo-acoustic conversion system and an acoustic-electric conversion system. The thermo-acoustic conversion system comprises a sound production module and a Helmholtz resonant cavity, a ceramic plate stack soaked with water exists in the sound production module, and the stable temperature difference needed for generating the thermo-acoustic effect at the two ends of the ceramic plate stack is reduced. Sound waves generated by the thermoacoustic effect form standing waves in the Helmholtz resonant cavity, and the sound intensity is amplified; the acoustic-electric conversion system comprises piezoelectric ceramics and a triode common-emitter amplification circuit, the piezoelectric ceramics are arranged at the tail end of the resonant cavity and convert acoustic energy into electric energy, and the electric energy is amplified by the triode common-emitter amplification circuit and then drives a nixie tube to display. The experimental device integrates thermodynamics, fluid mechanics, acoustics, material science and electronic technology, has the characteristics of simple structure, low cost, rich physical process and strong exploration, is suitable for experimental teaching, particularly suitable for new engineering teaching requirements, and is beneficial to improving the multidisciplinary cross practice ability of students.

The present application relates to the technical field of nanomanipulation, and more particularly to a method and device for manipulating nanoparticles based on the principle of acoustic streaming suppression, the method comprising the following steps: S1. setting a microfluidic chip with a cavity; S2. establishing a target standing wave acoustic field in the cross section of the cavity, wherein the sound pressure node plane of the target standing wave acoustic field is parallel to the adjacent side wall of the cavity; S3. introducing a fluid containing nanoparticles into the cavity, and the nanoparticles can be driven to the sound pressure node region under the action of acoustic radiation force and form a stable aggregation cluster; the device comprises a microfluidic chip, the microfluidic chip is provided with a cavity, and the surface of the microfluidic chip is provided with an acoustic wave driving structure, and the sound pressure node plane of the standing wave acoustic field generated by the acoustic wave driving structure is parallel to the adjacent side wall of the cavity. The present application can realize the directional or point manipulation of nanoparticles under the action of actively suppressing acoustic streaming interference.

The invention discloses a frequency mixer test method, and relates to the technical field of microwave radio frequency test, and the method comprises the following steps: S1, building a test platform; s2, calibrating the test platform; s3, testing indexes; and according to the received reflection signal and standing wave signal, port isolation test, frequency conversion loss test, port standing wave test and output 1dB compression point test are carried out on the mixer to be tested, and a test curve of each index is drawn after the test is completed. According to the method, all key indexes of the mixer can be tested at different power frequency points through one-time calibration, meanwhile, standing wave testing of the LO port under high power can be achieved, the testing efficiency and accuracy are greatly improved, and the technical problems that in the prior art, multiple times of calibration are needed in the testing process, and the testing efficiency is low are solved.

This invention relates to the field of ultra-precision polishing technology, specifically to an ultrasonic cavitation microjet polishing module for polishing microstructures. The module includes an acoustic focusing nozzle, a center-penetrating piezoelectric transducer, an adaptive acoustic impedance frequency tracking system, and a liquid supply and bubble nucleation system. The acoustic focusing nozzle employs a variable cross-section acoustic amplitude rod structure, ensuring that the standing wave antinodes and nozzle outlet are confocal, thus increasing energy density. The piezoelectric transducer has a ring structure with fluid flowing through its center, achieving efficient energy conversion. The frequency tracking system adjusts the excitation frequency in real time to maintain resonance. The liquid supply system introduces cavitation nuclei through a venturi tube, reducing the cavitation threshold. This invention, through an acoustic-fluid coupling mechanism, utilizes the dual effects of macroscopic kinetic energy removal and microscopic cavitation removal to solve the problems of traditional polishing techniques, such as difficulty in processing high aspect ratio microstructures, incomplete bottom polishing, and low efficiency. It achieves high-precision polishing of microstructure surfaces, and is particularly suitable for ultra-precision machining of deep and narrow grooves.

The utility model discloses a broadband bridge, which comprises a first input port, a first output port, an isolation output port, a coupling output port, a front-stage coupling branch knot, an intermediate-stage coupling branch knot, a final-stage coupling branch knot, a dielectric layer and a metal layer, the metal layer is provided with a gold bonding wire, a microwave input transmission branch, a first microwave output transmission branch, a second microwave output transmission branch, an isolation port output branch and two independent microstrip lines. Three-stage coupling is adopted, namely, the front-stage coupling branch knot is connected and coupled with the last-stage coupling branch knot through the microstrip line, and the middle-stage coupling branch knot is connected and coupled with the independent microstrip line six-line through the gold bonding wire, so that the requirements of broadband 6-18GHz and low insertion loss are met, the standing wave characteristic is improved, the isolation degree and the direction are good and are both smaller than-20dB, and the isolation degree and the direction are smaller than-20dB. And moreover, good amplitude-phase consistency is achieved, the amplitude is 3dB + / -0.3, the phase is 91 degrees + / -5 degrees, and the overall performance is improved.

The invention provides a standing wave acceleration structure and an acceleration device. The standing wave acceleration structure comprises a light velocity section and a bunching section. The light velocity section comprises a plurality of light velocity cavities which are distributed in the axial direction of the light velocity section and are sequentially communicated. The bunching section comprises a bunching cavity and an entrance port, the bunching section is arranged at the upstream of the light velocity section along the electron beam direction, the entrance port is communicated with the bunching cavity, and the bunching cavity is communicated with the light velocity cavity at the most upstream. Wherein an accelerating electric field in the axial direction of the light velocity section is formed in the light velocity cavity, the phase of electrons entering the light velocity cavity is ahead of the maximum accelerating phase of the accelerating electric field, and the phase of the electrons after acceleration does not exceed the phase corresponding to the maximum value of the electric field intensity of the accelerating electric field. According to the acceleration structure provided by the embodiment of the invention, the energy dispersion of the electron beam can be reduced by adopting a sliding phase method, so that a smaller focus size can be obtained during subsequent quadrupole magnet focusing, the spatial resolution of the acceleration device is improved, and a better effect is achieved during fine defect detection.

1. Name of the designed product: compression frame. 2. Use of the designed product: compression frame for piezoelectric fan, compression frame for part of cavity that generates standing wave. 3. Design points of the designed product: in shape. 4. Picture or photo that best shows the design points: design 1 perspective view 1. 5. Design 1 is designated as the basic design.

This invention provides an output impedance calculation device, which includes: a control unit, an adjustment unit, a LORA transmitting unit, a first impedance calculation unit, a second impedance calculation unit, a matching unit, and a transmitting antenna. The control unit is used to transmit wireless signals; the LORA transmitting unit is used to convert wireless signals into LORA signals; the first impedance calculation unit is used to calculate the input impedance based on the LORA signals; the second impedance calculation unit is used to calculate the output impedance based on the LORA signals; the control unit is used to calculate the reflection coefficient based on the input and output impedances, and to calculate the standing wave ratio based on the transmission coefficient; the adjustment unit is used to adjust the impedance in the circuit based on the standing wave ratio and the reflection coefficient, thereby achieving impedance matching and balance between the input and output terminals of the line, improving the output quality of radio signals, reducing the overall output power consumption, and reducing harmonic interference.

1. Name of the designed product: teaching device (Kranich device). 2. Use of the designed product: the designed product is used for demonstrating standing wave phenomenon. 3. Design points of the designed product: in shape. 4. Picture or photo best indicating the design points: perspective view.

The utility model relates to the field of chemical production technology discloses a kind of gas-liquid reaction equipment with micro-bubble preparation function.The gas-liquid reaction equipment with micro-bubble preparation function includes reaction piece and ultrasonic emission component, and reaction piece is provided with reaction cavity;Ultrasonic emission component is arranged in reaction cavity, including multiple ultrasonic transducers and several ultrasonic energy absorbers, multiple ultrasonic transducers are spaced apart along vertical direction, ultrasonic energy absorber is arranged between any adjacent two ultrasonic transducers, serpentine reaction channel is formed between multiple ultrasonic transducers, liquid and gas can pass through serpentine reaction channel, ultrasonic transducer is configured to emit ultrasonic wave, and ultrasonic energy absorber is configured to absorb reflected ultrasonic wave.The gas-liquid reaction equipment with micro-bubble preparation function can avoid the occurrence of ultrasonic interference effect, the generation of standing wave field and the appearance of multi-path reflection phenomenon, reduce the loss of ultrasonic energy, and ensure the efficiency of gas-liquid reaction.

There is provided a plasma processing method comprising: continuously introducing electromagnetic waves into a chamber of a plasma processing apparatus, the electromagnetic waves being VHF waves or UHF waves, the electromagnetic waves being introduced into the chamber so as to form standing waves within the chamber along a lower surface of an upper electrode of the plasma processing apparatus; periodically applying a negative voltage to the upper electrode while performing said continuously introducing the electromagnetic waves; and supplying a processing gas into the chamber only during a period in which the negative voltage is applied to the upper electrode.

This invention relates to the field of dynamic load section stress monitoring and feedforward adaptive intelligent correction technology for coal conveyor belts in thermal power plants. The invention provides an automatic monitoring and correction device for coal conveyor belts, comprising: a control host that extracts speckle decorrelation index and maps the transverse segregation gradient matrix through a data acquisition and detection module; a rheological state analysis module that introduces a fractional-order calculus dynamics model to analyze the creep stress field and outputs a deformation potential energy time series; a spatial feature prediction module that uses the Koopman operator to elevate the nonlinear system to a linear functional space, identifies outbreak nodes by tracking eigenvalue drift trajectories, and issues early warning commands; and an acoustic field adhesion breaking correction module that drives piezoelectric ceramic elements to construct a local acoustic radiation standing wave field, breaking van der Waals forces to release transverse shear potential energy. This invention solves the risk of belt misalignment and tearing caused by material segregation and adhesion under multi-coal blending conditions.

The invention relates to a coating material for a processing chamber. Embodiments described herein relate to methods of controlling the uniformity of SiN films deposited on large substrates. When a precursor gas or gas mixture in a chamber is excited by applying radio frequency (RF) power to the chamber, an RF current flowing through the plasma produces a standing wave effect (SWE) in an inter-electrode gap. When the substrate or electrode size approaches the RF wavelength, SWE becomes significant. Process parameters, such as process power, process pressure, electrode pitch, and gas flow ratio, may affect the SWE. These parameters may be altered in order to minimize SWE problems and achieve acceptable thickness and property uniformity. In some embodiments, methods of depositing a dielectric film over a large substrate at various process power ranges, at various process pressure ranges, at various gas flow rates while achieving various plasma densities will be used to reduce the SWE to yield greater plasma stability.

A method of fabricating an ultrasonic medical device is presented. The method includes machining a surgical tool from a flat metal stock, contacting a face of a first transducer with a first face of the surgical tool, and contacting a face of a second transducer with an opposing face of the surgical tool opposite the first transducer. The first and second transducers are configured to operate in a D31 mode with respect to the longitudinal portion of the surgical tool. Upon activation, the first transducer and the second transducer are configured to induce a standing wave in the surgical tool and the induced standing wave comprises a node at a node location in the surgical tool and an antinode at an antinode location in the surgical tool.

This invention discloses a method for the synergistic metabolic analysis of multiple components of traditional Chinese medicine (TCM) integrated with the gut microbiota. After initializing the microbiota ecosystem, a solution of multi-component TCM extracts is continuously injected into a microfluidic chip. Stable isotope-labeled precursors are pulsed into a specific simulation region to perform spatial isotope encoding. A standing wave acoustic field is applied at the sampling node of the microfluidic chip, and multiphase fluid spatial splitting is performed using the difference in the primary acoustic radiation force experienced by the particles to derive cell-free TCM metabolites. The cell-free TCM metabolites are separated by chromatography and gas phase drift separation. A four-dimensional metabolic feature array is constructed, and the absolute value of the mass shift is calculated for spatial inverse decoding. Closed-loop feedback is triggered based on the rate of change of target metabolite ion abundance, increasing the amplitude of the standing wave acoustic field pressure to confine intestinal bacteria and performing in-situ enrichment of synergistic metabolic intermediates. This invention realizes the spatial metabolic trajectory tracing and network reconstruction of multiple components of TCM in a complex gut microbiota ecosystem.

This invention provides a washing machine, an automatic dispenser, and a control method thereof. The automatic dispenser uses an ultrasonic generator to emit ultrasonic waves; an upper reflective surface is located above the nozzle; an oblique reflective surface is located below the nozzle. After passing through the oblique reflective surface, the ultrasonic waves form an upward-propagating wave, and after passing through the upper reflective surface, they form a downward-propagating wave. The upward and downward waves superimpose to form a standing wave. The vertical distance between the ultrasonic generator and the upper reflective surface satisfies the resonant cavity condition. The nozzle is located at the acoustic pressure node of the standing wave. The controller acquires the droplet mass that the maximum acoustic levitation force of the ultrasonic wave can support, obtains the dispensing mass, and calculates the target number of dispensing droplets based on the droplet mass that the maximum acoustic levitation force of the ultrasonic wave can support and the dispensing mass. When the counting detector detects that the number of droplets has reached the target number, the nozzle is controlled to stop dispensing droplets. This invention is based on acoustic levitation technology, has a relatively small error, and high dispensing accuracy, offering significant advantages for dispensing concentrated liquids.

The invention relates to the technical field of antenna devices and electromagnetic functional materials, and particularly discloses a high-temperature-resistant navigation antenna based on a high-temperature anti-oxidation conductor coating, which comprises an antenna pattern layer, a dielectric substrate and an outer edge shielding layer, and is characterized in that the antenna pattern layer is arranged on the upper surface of the dielectric substrate; the high-temperature anti-oxidation conductor coating is a double-fed circularly polarized microstrip navigation antenna pattern; the dielectric substrate is an oxide ceramic material dielectric substrate; and the outer edge shielding layer is a high-temperature anti-oxidation metal conductor coating and is coated on the outer side surface of the dielectric substrate. The high-temperature-resistant navigation antenna disclosed by the invention has the characteristics of high-temperature-resistant use environment, high-temperature oxidation resistance, 1.27 + / -0.01 GHz frequency band high signal gain and stable standing wave, and solves the problems that a metal antenna pattern is oxidized at high temperature and a dielectric medium organic material system is ablated and damaged at high temperature in a traditional metal antenna pattern / organic dielectric medium navigation antenna material system scheme; and the antenna has good high-temperature navigation antenna engineering application value.

This application relates to the field of non-ferrous metal processing and forming equipment technology, and discloses an extrusion processing and manufacturing equipment for non-ferrous metal sheets. Along the running direction of the non-ferrous metal sheet, it sequentially includes a continuous extrusion forming module, a thermoacoustic adaptive flutter cooling transition module, and a continuous drawing forming module. The thermoacoustic adaptive flutter cooling transition module includes a synchronous flexible track follower system and a coaxial nested independent suspended micro-forging array mounted on the synchronous flexible track follower system. The synchronous flexible track follower system is used to clamp and follow the newly extruded non-ferrous metal sheet, and the coaxial nested independent suspended micro-forging array contacts the non-ferrous metal sheet. By relying on the porous ceramic regenerator and high-pressure inert gas inside the closed-loop standing wave thermoacoustic plunger body, the massive amount of waste heat emitted from the residual thermal stress concentration area of ​​the metal sheet is directly converted into standing wave sound pressure with directional bombardment capability, allowing the micro-forging array to start spontaneously without relying on any external electromechanical vibration source.

The invention relates to a colorimetric method-based rapid detection device and method for organic matters in industrial byproduct gypsum. The colorimetric method-based rapid detection device comprises a sample introduction and pre-dispersion module, an extraction reaction module, a pneumatic cyclone separation and refined filtration module, a color development mixing module and a colorimetric detection module, the sample injection and pre-dispersion module realizes continuous quantitative conveying and mixing of samples, the extraction reaction module performs micro-cutting type enhanced extraction on particles by utilizing an acoustic streaming effect generated by high-frequency standing waves, and the pneumatic cyclone separation and fine filtration module realizes rapid and efficient solid-liquid separation through tangential gas injection enhanced cyclone and in cooperation with an air flotation effect. The developing and mixing module is used for automatically and quantitatively mixing reagents. According to the invention, automation and continuity of the whole process from coarse particle sample feeding to organic matter content result output are realized, the detection time is greatly reduced, and the method is especially suitable for rapid quality monitoring of production and application sites of industrial by-product gypsum such as ardealite and the like.

The invention provides a pi / 2 mode standing wave accelerating tube containing a beam position detector and a beam monitoring method. The pi / 2 mode standing wave accelerating tube containing the beam position detector comprises a plurality of radio frequency period units which are sequentially arranged in the axial direction, and each radio frequency period unit comprises four cavities which are sequentially a first accelerating cavity, a first coupling cavity, a second accelerating cavity and a second coupling cavity in the axial direction; axial acceleration electromagnetic fields are arranged in the first acceleration cavity and the second acceleration cavity and are used for accelerating the electron beam current; no axial acceleration electromagnetic field exists in the first coupling cavity and the second coupling cavity, and the first coupling cavity and the second coupling cavity are used for coupling power of adjacent acceleration cavities. A beam position detector is embedded in the cavity wall of the first coupling cavity and / or the second coupling cavity, at least one coupling cavity in each radio frequency period unit is provided with the beam position detector, and a beam pipeline of the beam position detector is collinear with the main axis of the pi / 2 mode standing wave accelerating tube and is used for monitoring the internal beam of the pi / 2 mode standing wave accelerating tube.