11 results about "Electric field amplitude" patented technology

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.

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 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.

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 invention provides a signal compensation method, device and equipment, a medium and a product, and the method comprises the steps: constructing a three-dimensional rectangular coordinate system with a passive signal transmitter as an original point, and constructing a spatial tetrahedron in the three-dimensional rectangular coordinate system; determining a directional diagram function of a scattering projection signal of a transmission signal of the passive signal transmitter on the spatial tetrahedron, the directional diagram function including a phase directional diagram function and an amplitude directional diagram function; calculating an electric field amplitude function according to the amplitude pattern function, and evaluating the signal intensity received by the target receiver through the electric field amplitude function; and compensating the signal intensity of the emission signal of the passive signal emitter through a pattern multiplication principle according to the pattern function of the scattering projection signal of the emission signal. According to the invention, the space angles of the signal transmitting and receiving equipment are optimized, interference and attenuation caused by signal reflection are reduced to the greatest extent, and signals are compensated in an environment backscatter communication system.

The application belongs to the technical field of light manipulation, and provides a graphene dimer-based nano-antenna scattering direction regulation method and device, wherein a plane electromagnetic wave with a preset electric field amplitude and electric field direction is irradiated to a dimer nano-antenna; the dimer nano-antenna is composed of a dielectric particle nanodimer system with different radii wrapped by two nonlinear graphenes; more parameters can be introduced, the required light intensity energy of incident light can be effectively reduced, damage of the nano-antenna caused by high temperature can be avoided, and the adjustability is higher, so that the properties of electromagnetic waves can be more flexibly controlled, and more functions can be realized.

Providing atomic-based electromagnetic field sensing elements and measurement systems. [Solution] A method and apparatus for sensing or measuring an electromagnetic field. The method involves an electromagnetic field and excitation of atoms in a gas occupying a test volume in Rydberg states. Transmission along a path of at least one probe beam of electromagnetic radiation across the test volume is measured at one or more frequencies overlapping with certain spectral features, and the physical properties of the electromagnetic field are derived based on variations in the spectral features. In various embodiments, the electromagnetic fields may be set up in an interfering relationship with another electromagnetic field. Time-varying electric field amplitude, frequency, phase, and noise spectral distribution, and thus AM and FM modulated fields as well as a magnetic field of about 1 Tesla, can be measured. The apparatus for measuring the electromagnetic field may be unilaterally coupled to the probe field and a detector or an array of detectors.

This invention provides a method for robotic arm path planning and maintenance for live-line work in power distribution networks, belonging to the field of robotic arm path planning and maintenance technology. It plans a maintenance path for the robotic arm performing live-line work that meets geometric collision-free, electrical insulation safety, and compliance with live-line operation procedures, establishing a four-dimensional composite configuration space including the amplitude of the electric field intensity in the work area. Rigid prohibition points are marked according to the maximum allowable electric field intensity threshold, and a risk potential field layer is constructed by combining the electric field amplitude and distance risk potential field function. The task type is analyzed, and electrical safety operation timing logic rules are retrieved and converted into path search cost penalty terms. A fusion path search is performed based on an improved fast random expansion tree algorithm, and geometric collision, electric field rigid prohibition, cumulative risk potential field, and timing logic consistency checks are performed on the generated new nodes. This invention embeds electromagnetic situational awareness into the planning kernel, achieving dual geometric and electrical obstacle avoidance, significantly improving the safety of live-line work.

An interferometric measurement method using an interferometric measurement apparatus includes a first step of 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 of 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 of acquiring a physical property of the sample based on the peak amplitudes of the first and second electric field amplitude waveforms.