48 results about "Electric field amplitude" patented technology

The invention provides an ultra-wide-band low-RCS metasurface based on polarization conversion units. The ultra-wide-band low-RCS metasurface is formed by rotating the polarization conversion units at different positions by a specific angle and arranging the polarization conversion units. According to the invention, the polarization conversion rate under the broadband is mainly improved, and the RCS is reduced; according to the scheme, the wavefront phase of the incident electromagnetic wave can be changed, so that the reflected electromagnetic wave carries the vortex phase; by utilizing the characteristic of the phase singular point of the vortex wave, the amplitude of the electric field at the center of the reflected wave is zero, and the metasurface shows obvious RCS reduction along the propagation axis. In addition, based on the broadband design of the polarization conversion unit, RCS reduction in an ultra-wideband range is finally realized.

The invention relates to an electric field visualization real-time monitoring system and method, belongs to the technical field of electric field visualization, and is used for solving the problems of insufficient real-time performance, large measurement interference, incomplete imaging, weak multi-user cooperation and lack of unified time reference in the prior art. The method comprises the following steps: acquiring electric field scattering data of a test body by a conformal optical fiber electric field sensor array, transmitting the electric field scattering data to an edge GPU node through a plastic optical fiber-CAN-FD link, and converting the electric field scattering data into electric field amplitude data; the edge GPU node is combined with WebGL3D texture mapping and a volume ray casting algorithm to complete volume rendering, and multi-user concurrent interaction is realized through a Web server and a browser client; and a White-Rabbit clock architecture is adopted to provide a unified time reference for the whole process. According to the method, dynamic and accurate capturing of the electric field is achieved, and the multi-user concurrent access requirement is effectively met.

An electrostatic spinning system based on an enhanced electric field comprises a spray head used for spraying a polymer solution to a fiber membrane in an electrostatic coating mode; an adjustable potential difference is established between the receiving end and the spray head, so that the spray head can spray the fiber membrane borne on the receiving end in an electrostatic coating manner. At least part of the fiber membrane is maintained on the receiving end through electrostatic adsorption formed by potential difference, and an electric field amplitude modulation assembly is arranged on the periphery of the nozzle. Wherein the electric field intensity in the influence area of the electric field amplitude modulation assembly is greater than the electric field intensity outside the influence area of the electric field amplitude modulation assembly. The electric field amplitude modulation assembly is adopted by the nozzle, the electric field intensity around the nozzle can be strengthened and stabilized, electrostatic coating can be better conducted on the fiber membrane, and meanwhile an electric field can exist outside an electrostatic coating area to meet the requirement that the fiber membrane is electrostatically adsorbed to the receiving end.

The present invention provides an interference measurement method and apparatus that can appropriately measure the physical properties of a sample in a non-contact manner. [Solution] The interference measurement method using the interference measurement device 1 includes: a first step of obtaining a first interference waveform W1 for each optical path length difference in the first state by performing measurements while changing the optical path length difference between the first optical path P1 and the second optical path P2 in a first state in which no sample S is placed in the second optical path P2; a second step of converting the first interference waveform W1 into a first electric field amplitude waveform WE1; a third step of obtaining a second interference waveform W2 for each optical path length difference in the second state by performing measurements while changing the optical path length difference in a second state in which a sample S is placed in the second optical path P2; a fourth step of converting the second interference waveform W2 into a second electric field amplitude waveform WE2; and a fifth step of obtaining measured values ​​regarding the physical properties of the sample S based on the electric field amplitudes corresponding to the peaks of the first electric field amplitude waveform WE1 and the second electric field amplitude waveform WE2, respectively.

The invention discloses a vortex electromagnetic wave modal purity estimation method and system based on main lobe ripple measurement, a storage medium and electronic equipment. The method comprises the following steps: measuring the electric field amplitude and phase of vortex electromagnetic waves in a free space; finding a vortex electromagnetic wave beam center through phase distribution; gradually determining the position of a vortex electromagnetic wave main lobe by taking the beam center as a circle center; calculating the average amplitude and the difference between the maximum amplitude and the minimum amplitude along the circumference where the main lobe is located, and calculating the relative main lobe ripple; and finally, calculating to obtain the modal purity of the vortex electromagnetic wave. According to the invention, the modal purity of the generated vortex electromagnetic wave can be accurately calculated, the subsequent collection and processing of the received data are facilitated, and the influence of the waste of the collected information caused by the modal aliasing can be effectively reduced.

An interference measuring device 1A comprises a light source 10, an interference optical system 20A, a photomultiplier tube 30, an interference intensity measuring unit 40, a unit 50 for calculating the electric field amplitude, and an analysis unit 60. The light source 10 emits light in a band (a light band containing terahertz waves) to which the photomultiplier tube 30 is sensitive. The photomultiplier tube 30 is sensitive in a light band containing terahertz waves and outputs an electrical signal with a value corresponding to the intensity of the incident light.The unit 50 for calculating the electric field amplitude converts a value of intensity V of interference light, measured by the interference intensity measuring unit 40, into a value of electric field amplitude E, based on a relationship between a value of the electric field amplitude of light incident on the photomultiplier tube 30 and a value of the electrical signal output by the photomultiplier tube 30. It obtains the value of the electric field amplitude E of the interference light for each value of a time difference Δt, which corresponds to an optical path length difference Δd. Thus, an interference measuring device and an interference measurement method are realized that can perform Fourier spectroscopy by interference measurement using a terahertz wave quickly and accurately.

Provided is a method of reducing the magnitude of a quasi-static electric dipole field at the null position of an oscillating electric quadrupole field of an ion trap. The method includes trapping at least one ion in a trapping electric field. The trapping electric field includes an electric field amplitude; using an interferometry sequence including applying a first laser pulse when the trapping electric field amplitude includes a first trapping electric field amplitude; applying a second laser pulse when the trapping electric field amplitude includes a second trapping electric field amplitude different from the first electric field amplitude; and measuring a state of the ion; repeating the interferometry sequence in order to obtain a plurality of measurements of the state of the ion; determining a probability that the trapped ion changes state; and adjusting the trapping electric field based on the determined probability.

The application provides a weak ocean electric field measurement system with high Q quartz crystal oscillator frequency conversion resonance matching, which realizes high sensitivity and super high signal-to-noise ratio of seawater electric field measurement with small volume / interval. The application uses switch to alternately turn on and off metal mesh and shield cover, improves seawater electric field modulation frequency, realizes high Q resonance matching by parallel connection of multiple quartz crystal oscillators with the same characteristics, obtains passive amplification, greatly improves high-frequency modulation electric field amplitude and signal-to-noise ratio, so that the small volume / interval sensor can also obtain large electric field response. The electric field measurement method has the characteristics of small volume, high sensitivity and high signal-to-noise ratio, and can not only be flexibly arranged in various very weak electric field detection, but also can constitute a phased array electric field sensor to measure long-distance seawater electric field distribution, greatly expanding the field of ocean electric field measurement.

The present invention discloses a terahertz electron gun, comprising a tip cathode (1), a cavity cathode end plate (2), a cavity (3), a cavity outlet end plate (4) and a beam hole (5); the tip cathode (1) and the cavity cathode end plate (2) are an integral structure, and in an area inside the cavity (3), where the field strength is the highest inside the cavity (3), the surface of the tip cathode (1) emits electrons under the action of a strong electric field; the cavity cathode end plate (2), the cavity (3) and the cavity outlet end plate (4) are independent components connected to form a whole; the beam hole (5) is located at the center of the cavity outlet end plate (4) and is used to extract a beam. The invention has a simple and compact structure, is easy to process, and is easy to use. The electron gun has a simple and compact structure, establishes a terahertz field inside the cavity, and when the electric field amplitude exceeds the field emission condition, the cathode surface emits electrons to generate an ultrashort femtosecond pulse beam, while overcoming the pulse jitter problem.

An optical property evaluation device 20 according to the present disclosure comprises: a test light generation unit 30 that generates test light; an input / output unit 40 that inputs the test light from one end of an optical fiber 10 under test in any polarization state, and acquires and outputs, from the one end, backscattered light from each point of the optical fiber 10 under test; a backscattered light complex electric field amplitude acquisition unit 50 that acquires, for each point of the optical fiber 10 under test, a complex electric field amplitude of the backscattered light output from the input / output unit 40; and an arithmetic processing unit 60 that converts the complex electric field amplitude into a matrix for each point of the optical fiber 10 under test, and evaluates polarization dependent loss using a singular value of the matrix.

The invention relates to an electric field phase difference encoder, a joint motor and a robot, a first stator pattern area and a first stator signal receiving ring are arranged on the first stator surface of a stator from outside to inside along the radial direction of the stator, and the first stator pattern area comprises a plurality of groups of first stator electric field generating sheets; the first stator electric field generating sheets are distributed along the periphery of the first stator signal receiving ring; a first rotor pattern area and a first rotor signal transmitting ring are arranged on the first rotor surface of the first rotor from outside to inside in the radial direction of the first rotor, the first rotor pattern area comprises a plurality of first rotor induction sheets, and the first rotor induction sheets are distributed along the periphery of the first rotor signal transmitting ring; the surface of the first rotor is opposite to the surface of the first stator. The relative position change is obtained by using the electric field phase difference instead of the electric field amplitude, so that the abnormities such as rotation angle jitter caused by dust and greasy dirt interference and rapid change interference of the magnetic field in the motor can be effectively reduced, and the requirement on the environmental stability is low.

The present invention provides a method for power measurement and mode monitoring of a planar high-power microwave radiation field. The power measurement method includes: in a measurement site, arranging a planar microwave sensor on a measurement surface in the energy concentration area facing the radiation source; concentric first to Nth measurement rings are arranged on the measurement surface; Q measurement points on the nth measurement ring are respectively: the first measurement point T of the nth ring 1 n to the Qth measurement point T of the nth ring Q n ; a microwave sensor is arranged at each measurement point; the electric field amplitude and electric field phase of each measurement point are measured and obtained by using the planar microwave sensor, and the power density is calculated according to the electric field amplitude; the radiation field power of the radiation source is obtained by integrating the power density on the measurement surface. The mode monitoring method includes: representing the distribution of the radiation electric field intensity on the measurement surface with different colors to achieve image display; diagnosing and monitoring the types, amplitudes, and phases of the hybrid modes of the high-power microwave source by using the principle of mode orthogonality.

The invention discloses a miniaturized low-sidelobe substrate integrated waveguide horn antenna and wireless communication equipment, the miniaturized low-sidelobe substrate integrated waveguide horn antenna comprises an upper dielectric substrate, a middle dielectric substrate, a lower dielectric substrate, a substrate integrated waveguide back cavity structure and a substrate integrated waveguide H-plane horn, the middle dielectric substrate extends towards the front end of a horn aperture for a certain distance, and the upper dielectric substrate and the lower dielectric substrate are loaded at the position of the horn aperture; a first metal column array and a second metal column array are loaded in the upper-layer dielectric substrate and the lower-layer dielectric substrate; the length of the flaring part of the horn is shortened by about 50%; a pair of triangular air slots is cut in the horn structure, right trapezoid dielectric chamfers are cut at the tail ends of the three layers of dielectric substrates, and the horn structure adopts an E-surface corrugated wall to realize conical electric field amplitude distribution and uniform electric field phase distribution at the aperture position so as to realize the low sidelobe characteristic of-30dB; third and fourth metal column arrays are loaded in the upper and lower dielectric substrates, the edge metal columns cover the rectangular metal strips, and fifth and sixth metal column arrays are loaded at the tail ends of the upper and lower dielectric substrates. According to the invention, miniaturization and low sidelobe performance are realized at the same time.

This invention provides a CaBi₂Nb₂O₉ ceramic, wherein the area of ​​ferroelectric domains in any cross-section of the CaBi₂Nb₂O₉ ceramic accounts for 14-18% of the cross-sectional area; and the length of the ferroelectric domains in the CaBi₂Nb₂O₉ ceramic is 234-596 nm, and the thickness is 41-196 nm; the inverse piezoelectric coefficient extrapolated from the zero electric field amplitude of the CaBi₂Nb₂O₉ ceramic is 6.5-6.8 pm / V; and the Rayleigh coefficient of the CaBi₂Nb₂O₉ ceramic is 0.15-0.18 × 10⁻⁶. ‑17 m 2 / V 2 Furthermore, the CaBi₂Nb₂O₉ ceramic at room temperature... 33 The C / N ratio is 13-13.5 pC. This invention also discloses the preparation method and application of the CaBi₂Nb₂O₉ ceramic.

The embodiment of the application discloses a discharge detection method for surface defects of an insulator and related equipment, through obtaining a plurality of ultrahigh frequency electromagnetic wave signals and low-frequency electric field time-domain waveform signals of the surface defects of the insulator within a preset detection period, and performing eigenvalue extraction to obtain an amplitude mean value, an amplitude variance and a phase variance corresponding to the ultrahigh frequency electromagnetic wave signals, and a voltage zero-crossing moment electric field amplitude, a voltage and electric field waveform cross-correlation coefficient and an electric field waveform kurtosis factor corresponding to the low-frequency electric field time-domain waveform signals, multi-dimensional information reflecting the discharge state of the surface defects of the insulator is comprehensively obtained; a discharge degree evaluation factor is calculated in combination with a preset weight, the influence of various eigenvalues on the discharge degree can be comprehensively considered, and occasional and weak discharge signals can be effectively captured; whether the insulator discharges or not is judged according to the discharge degree evaluation factor and a preset threshold value, and the accuracy and reliability of the discharge detection result are improved.

The present invention relates to a method for enhancing the synchronization stability of a multilayer semiconductor laser network, belonging to the field of communication technology. The present invention obtains an adjacency matrix based on the symmetrical multilayer network topology structure, introduces the adjacency matrix into the Lang-Kobayashi equation, establishes a modified Lang-Kobayashi equation group that describes the dynamic characteristics of the multilayer semiconductor laser network, and then calculates the complex slowly varying electric field amplitude of each layer of laser using the modified Lang-Kobayashi equation group that describes the dynamic characteristics of the multilayer semiconductor laser network. Finally, a cross-correlation function is introduced, and the synchronization quality between lasers is calculated based on the complex slowly varying electric field amplitude using the cross-correlation function. By taking advantage of the symmetrical structure of the independent layers in the multilayer network and changing the inter-layer connection mode of the multilayer laser network, the synchronization stability of the group in the network is enhanced.

An optical characteristic evaluation device 20 according to the present disclosure comprises: a test light generation unit 30 that generates test light; an input / output unit 40 that injects the test light in a given polarization state into one end of an optical fiber 10 under test, and acquires, from the one end, backscattered light from points along the optical fiber 10 under test and outputs the backscattered light; a backscattered light complex electric field amplitude acquisition unit 50 that acquires, for each point along the optical fiber 10 under test, the complex electric field amplitude of the backscattered light output from the input / output unit 40; and an arithmetic processing unit 60 that converts the complex electric field amplitude into a matrix for each point along the optical fiber 10 under test and evaluates polarization-dependent loss using the singular values of the matrix.

An interference measurement method using an interference measurement device according to the present invention comprises: a first step for acquiring a first interference waveform in a first state by changing an optical path length difference between a first optical path and a second optical path in the first state in which a sample is not disposed in the second optical path; a second step of converting the first interference waveform into a first electric field amplitude waveform; a third step for acquiring a second interference waveform in a second state by changing the optical path length difference in the second state in which the sample is disposed in the second optical path; a fourth step of converting the second interference waveform into a second electric field amplitude waveform; and a fifth step for acquiring a measured value relating to the physical properties of the sample on the basis of the electric field amplitudes corresponding to the respective peaks of the first electric field amplitude waveform and the second electric field amplitude waveform.

The present invention belongs to the technical field of electronic materials, and in particular, relates to a broadband low RCS metasurface design method based on SAM-OAM coupling. The present invention realizes broadband coverage of M basic units of 2π phase based on geometric phase, changes the wavefront phase of electromagnetic waves, and forms a vortex metasurface; at the same time, the incident circularly polarized plane wave is reflected by the vortex metasurface, and the SAM carried by the circularly polarized incident wave is coupled and superimposed with the OAM generated by the vortex metasurface, so as to realize the spiral distribution characteristics and phase singularity of the reflected electromagnetic wave wavefront phase exp(ilφ). The vortex wave reflected by the metasurface of the present invention has the characteristic of "central void", which is a typical feature caused by the phase singularity of the vortex wave, so that the electric field amplitude at the center of the reflected wave is zero, and the broadband design of the basic unit finally realizes a metasurface structure with low RCS characteristics in a broadband range, which has broad development prospects in the microwave field.

The application discloses a circularly polarized antenna and a wearable device, and forms a first slot antenna between a first ground structure and a second ground structure and forms a second slot antenna between the second ground structure and a third ground structure, the electric field amplitudes of the first slot antenna and the second slot antenna are equal, there is a magnetic coupling effect between the two slot antennas, the orthogonal electric field components of the two slot antennas form a phase difference of 90 degrees, a pair of spatially orthogonal slot antennas are constructed, a pair of orthogonal equal-amplitude electric field components are generated, and the circular polarization effect of the antenna is realized. Furthermore, the first slot antenna is connected with a first lumped element matching network, and the second slot antenna is connected with a second lumped element matching network, so that the resonant mode of the two slot antennas is changed from 1 / 2 wavelength resonance to 1 / 4 wavelength resonance, thereby realizing the miniaturization effect of the antenna. The antenna with the above-mentioned circular polarization and miniaturization characteristics is particularly suitable for miniaturized wearable devices such as smart watches.

The invention concerns a microwave disinfection device (2) configured to destroy / inactivate the SARS-COV-2 and H1N1 viruses and comprising a microwave irradiation section (22) configured to: irradiate microwave signals that have an incident electric field amplitude not higher than 6 V / m and frequencies that are included in the 8-10 GHz band and are spaced from each other by a step comprised between 10 MHZ and 100 MHz; irradiate the microwave signals at each individual frequency for a time interval comprised between 50 ms and 1 s; and irradiate the microwave signals with duty cycles comprised between 5% and 50%.

Systems, apparatuses, and methods are described for a transformer supporting two or more sets of windings electrically connected to different voltage levels. Use of stress control materials or composite materials (comprising a matrix and filler) may direct electrical fields caused by the different voltage levels to have a lowered electrical field amplitude.

The application discloses an exponential function-based gradual change grid width type staggered double-grid slow wave structure which is formed by periodically arranging a plurality of single grid bodies in a rectangular waveguide; the single grid body is a double-grid structure in which an upper grid unit and a lower grid unit are staggered; a certain spacing is arranged between the upper grid unit and the lower grid unit, and a strip-shaped electron beam channel is formed; the upper grid unit and the lower grid unit are of the same structure, and the cross section shape of the upper / lower grid unit is as follows: the two ends are rectangular, and the cross section profile curve of the middle part is an exponential function. The longitudinal electric field amplitude is high under the premise that the phase velocities are similar, so that the coupling impedance is high, and the traveling wave tube can provide higher output power, gain and electron efficiency.

Systems, apparatuses, and methods are described for a transformer supporting two or more sets of windings electrically connected to different voltage levels. Use of stress control materials or composite materials (comprising a matrix and filler) may direct electrical fields caused by the different voltage levels to have a lowered electrical field amplitude.

The invention discloses a multi-acceleration unit type superconducting cavity plasma electromagnetic excitation circuit and an implementation method, and the circuit is characterized in that a first radio frequency signal source and a second radio frequency signal source are connected to a power combiner, and then are sequentially connected with a power amplifier, a circulator, a directional coupler and a power coupler of a superconducting cavity; an isolation port of the circulator is connected with the matched load, a coupling end of the directional coupler is connected with the first power meter, and an isolation end of the directional coupler is connected with the second power meter. A signal provided by the first radio frequency signal source aims at establishing an electric field maximum value in a certain unit and a symmetrical unit of the multi-acceleration unit type superconducting cavity, and a signal provided by the second radio frequency signal source enables the certain unit and the symmetrical unit to generate 10% of electric field amplitude difference, so that only one unit is at the electric field maximum value. According to the invention, each acceleration unit of the multi-acceleration-unit type superconducting cavity can be sequentially located at the maximum value of the electric field to excite the plasma, so that the plasma effectively cleans each acceleration unit.

The present invention discloses an optical antenna based on the low sidelobe characteristics of surface plasmons, belonging to the field of antennas. The antenna structure of the invention includes a silicon-based substrate at the bottom layer, a buried oxide layer of silicon dioxide in the middle layer, and an optical antenna composed of two gold thin film strips at the top layer. The present invention uses an optical plasmonic slot waveguide to transmit guided waves, in which the change in the slot width is used to generate a periodic modulation of the electric field amplitude to achieve the migration of spatial frequency, so as to radiate the fundamental harmonic into free space. At the same time, a bias is superimposed on the basis of the periodically changing slot width to further control the width of the slot along the transmission direction, so that the radiation aperture of the antenna meets the low sidelobe design amplitude. The present invention has the characteristics of simple structure, convenient processing and easy large-scale integration, and can be used in lidar and high-speed optical communication systems.

The application discloses a tunable surface plasmon excitation structure and belongs to the technical field of micro-nano photoelectronic technology, which comprises a substrate, a metal film is arranged on the substrate, an asymmetric slot is arranged on the metal film, the slot comprises a small groove and a large groove, PMMA polymer is arranged in the small groove, polyimide orientation layers are arranged on both sides of the inside of the large groove, a liquid crystal layer is arranged in the middle of the large groove, a layer of PMMA polymer is arranged on the top surface of the metal film, the metal films on both sides of the slot are isolated and disconnected, an external voltage is arranged on the metal films on both sides of the slot, the liquid crystal layer is in an electric field formed by the external voltage, the refractive index of the liquid crystal layer is changed by adjusting the external voltage, and thus the size of the surface plasmon electric field amplitude is realized. The tunable surface plasmon excitation structure has the characteristics of simple structure, convenient implementation, rapid response, small integration and the like.

Methods and apparatus for sensing or measuring an electromagnetic field. The method entails excitation into a distribution of Rydberg states of atoms of a gas occupying a test volume coextensive with the electromagnetic field. Transmission along a path traversing the test volume of at least one probe beam (103) of electromagnetic radiation is measured at one or more frequencies overlapping a spectral feature, and a physical characteristic of the electromagnetic field is derived on the basis of variation of the spectral feature. In various embodiments, the electromagnetic field may be place in interferometric relation with another electromagnetic field. Time-varying electric field amplitude, frequency, phase and noise spectral distribution may be measured, and thus AM and FM modulated fields, as well as magnetic fields of about 1 Tesla. The apparatus for measuring the electromagnetic field may be unilaterally coupled to a probe field and detector (732) or array of detectors.

An interference measurement device (1A) is provided with a light source (10), an interference optical system (20A), a photomultiplier tube (30), an interference intensity measurement unit (40), an electric field amplitude calculation unit (50), and an analysis unit (60). The light source (10) outputs light in a frequency band (frequency band of light including terahertz waves) in which the photomultiplier (30) has sensitivity. The photomultiplier (30) has sensitivity to a frequency band of light including terahertz waves, and outputs an electrical signal having a value corresponding to the intensity of incident light. The electric field amplitude calculation unit (50) converts the value of the intensity (V) of the interference light measured by the interference intensity measurement unit (40) into the value of the electric field amplitude (E) on the basis of the relationship between the value of the electric field amplitude of the light incident on the photomultiplier tube (30) and the value of the electric signal output from the photomultiplier tube (30). The value of the electric field amplitude (E) of the interference light is obtained for each value of the time difference ([Delta] t) corresponding to the optical path length difference ([Delta] d). As a result, an interference measurement device and an interference measurement method are achieved, whereby Fourier spectroscopy based on interference measurement using terahertz waves can be accurately performed at a high speed.

The invention relates to the technical field of unmanned aerial vehicle navigation and positioning, in particular to an unmanned aerial vehicle power transmission line tracking and positioning method based on an electric field sensor array. According to the method, a circular array composed of five electric field sensors is arranged on the unmanned aerial vehicle, four sensors are evenly distributed on the edge, and one sensor is located in the center to form a symmetrical structure. And acquiring the amplitude, direction, gradient and time-varying characteristic data of the electric field in real time, and inputting the processed data into the ranging and positioning model. The model deduces a power transmission line electric field change rule based on a point charge field intensity formula, and calculates a measurement relation between sensors in combination with a cosine law to realize accurate calculation of a relative position, an elevation angle and a course angle between the unmanned aerial vehicle and the power transmission line. And meanwhile, the system has real-time monitoring and abnormity alarm functions, and when the electric field is detected to be abnormal, the system automatically adjusts the flight state and transmits abnormal data to a monitoring center. According to the method, the defect that traditional visual navigation is greatly influenced by the environment is overcome, and the all-weather autonomous tracking and positioning capability is realized.