234 results about "Wattmeter" patented technology

The invention relates to a time-varying power high-precision calculation technology of an electric drive system under strong electromagnetic noise interference, and mainly solves the problem of inaccurate power calculation of the electric drive system under strong electromagnetic environment noise and frequency time-varying fluctuation scenes. According to the core technology, a dominant frequency fluctuation curve of a signal is obtained through dynamic tracking of a dominant frequency, and a dynamic band-pass filter changing along with the dominant frequency of the electric drive system is constructed; suppressing pulse noise by combining amplitude self-adaptive filtering of a nonlinear weighting function; a phase demodulation technology fusing zero crossing point correction and Hilbert transform is adopted to eliminate the phase interference problem caused by complex waveforms and weak noise signals; and finally, establishing a time-varying power physical model based on the sliding window. According to the technology, the power calculation accuracy of the electric driving system under the conditions of strong field environmental noise and continuous main frequency conversion is remarkably improved.

The invention relates to the technical field of electric energy identification, in particular to an energy consumption identification system based on a power transformation aliasing scene, which comprises a disturbance boundary extraction module, a boundary stability judgment module, an aliasing state identification module, a periodic power calculation module and an energy consumption attribution judgment module. According to the method, a voltage sag record with a phase offset characteristic is formed through continuous tracking of the periodic voltage fluctuation starting and ending point indexes, a stable fluctuation judgment mechanism is constructed in combination with offset statistics, and accurate identification of aliasing sections is realized by means of disturbance amplitude and frequency extraction. A power sequence is constructed on the basis of voltage and current synchronous sampling values, period integration is completed, a high-precision calculation result of energy consumption is formed, fine division of cross interference period energy consumption under the condition of no physical isolation is achieved, dependence of external metering equipment is avoided, independent quantization of overlapping load energy consumption is achieved, and the calculation efficiency is improved. And a feasible means is provided for energy efficiency evaluation in a non-intrusive load identification and high-coupling scene.

The invention provides a multi-scale self-adaptive cooperative network construction type energy storage frequency modulation control system and method, and the system comprises a constant-voltage energy storage power supply which is used for providing DC electric energy; the three-phase inverter circuit is used for converting the direct-current electric energy into alternating-current electric energy and outputting the alternating-current electric energy to a power grid or absorbing the electric energy; the power calculator is used for calculating active power and reactive power output to the power grid by the three-phase inverter circuit; the battery SOH dynamic evaluation controller is used for outputting an SOH attenuation rate signal; the active loop controller is used for generating multi-scale adaptive frequency modulation data and sending the multi-scale adaptive frequency modulation data to the pulse adjustment controller; the reactive power ring controller is used for generating reactive power regulation data according to the power grid voltage deviation signal and sending the reactive power regulation data to the pulse regulation controller; and the pulse regulation controller is used for outputting a final pulse regulation instruction and a multi-scale cooperative control command to the three-phase inverter circuit. The oscillation risk is reduced, and long-term stable operation of the power system is guaranteed.

A calibration unit comprises a first port which is arranged for being connected to a measurement device; a calibration module comprising at least three different calibration standards for calibrating the measurement device; and a switching module configured to connect the first port with one of the at least three different calibration standards of the calibration module. A daisy chain port is arranged for being connected to a further calibration unit, to an external power meter, or to a device-under-test, DUT. The first port is connectable to the daisy chain port. An internal power meter is arranged within a housing of the calibration unit. The first port is connectable to the internal power meter; or an internal impedance tuner. The first port is connectable to the internal impedance tuner.

A grid-connection pre-synchronization method for a virtual synchronous generator parallel system, and an electronic device. The grid-connection pre-synchronization method for the virtual synchronous generator parallel system comprises: after receiving a pre-synchronization instruction, n virtual synchronous generators start to perform grid-connection pre-synchronization, wherein the grid-connection pre-synchronization comprises frequency and phase pre-synchronization, and amplitude pre-synchronization (S110). The frequency and phase pre-synchronization comprises: calculating control amounts for the frequency and phase pre-synchronization; according to the control amounts for the frequency and phase pre-synchronization, calculating a damping power; according to a mechanical power, an electromagnetic power and the damping power, calculating an output angular frequency difference of the virtual synchronous generators; and according to the output angular frequency difference of the virtual synchronous generator sand a rated angular frequency, determining a power angle of the virtual synchronous generators.

The embodiment of the invention provides a method, a device and a system for compensating anode voltage and output power of a magnetron, and belongs to the technical field of radiators for microwave heating. The method comprises the following steps: acquiring a current temperature and an anode voltage measurement value of a magnetron; calculating a correction voltage according to the current temperature; determining a temperature change rate according to the correction voltage and / or the anode voltage measurement value; performing PID control on the PWM signal of the magnetron according to the temperature change rate and the target voltage value; judging whether the current temperature is within a safe working interval or not; acquiring a current anode voltage value when the current temperature is out of the safe working interval; calculating theoretical output power according to the anode voltage value; calculating a power difference value between the theoretical output power and the actual output power; judging whether the power difference value is greater than or equal to a difference value threshold value; and calculating a target voltage value according to the theoretical output power and the input power under the condition that the difference value is greater than or equal to the difference threshold value.

The invention discloses an improved flexible direct current fault control method for improving current differential protection adaptability, and belongs to the technical field of power system relay protection and new energy power generation system grid-connected control. The method comprises the following steps: detecting a voltage drop abrupt change signal and a negative sequence voltage signal of a flexible DC output end, and starting a control strategy when the signals are satisfied; detecting a terminal voltage signal and active power of a new energy sending-out terminal, and calculating a new energy side current phase angle and a power angle; calculating a flexible DC side current phase angle control value and a negative sequence dq axis current reference value based on the parameters; and controlling the flexible DC side to output a negative-sequence current corresponding to the negative-sequence dq-axis current reference value, so as to actively adjust the current phase of the flexible DC side, reduce the phase angle difference between the fault current of the flexible DC side and the fault current of the new energy side, and discriminate the internal and external faults of the region through traditional current differential protection. According to the invention, the degree of freedom is controlled and the current phase is adjusted by using the flexible direct-current side negative-sequence current to reduce the phase angle difference of the two sides, so that the problem that the current differential protection adaptability in the double-end weak feedback system is reduced is solved, additional hardware is not needed, and the power grid safety and the new energy stable grid connection are ensured.

The invention discloses a rapid power calculation method suitable for an electric energy meter and an acquisition terminal, the electric energy meter and the acquisition terminal, and relates to the technical field of electric power measurement. According to the method, voltage and current signals are sampled, direct-current components are removed, and harmonic interference is suppressed through band-pass filtering; estimating the frequency of the power grid in real time by using zero-cross detection and linear interpolation; processing the filtered voltage and current signals by adopting a delay cancellation model based on a rotation matrix, and eliminating a negative frequency component to generate a corresponding orthogonal vector; and synchronously calculating active power and reactive power through algebraic operation according to the orthogonal vector. According to the method, establishment time delay introduced by a traditional low-pass filter is avoided, rapid tracking of a power value can be achieved when the load power is subjected to step change, electric energy metering deviation in the transient process is effectively reduced, and meanwhile calculation accuracy and robustness under the power grid frequency fluctuation working condition are improved through a frequency self-adaption mechanism.

The invention discloses an equivalent inertia online measurement method, system and device, and a storage medium. The method comprises the following steps: obtaining frequency data and active power data of a grid-connected point in a specific time period before and after disturbance power injection; carrying out smoothing processing on the obtained frequency data and the active power data; determining a frequency steady-state value and an active power steady-state value before and after disturbance; calculating a steady-state power difference value between the active power steady-state values before and after the disturbance and a steady-state frequency difference value between the frequency steady-state values before and after the disturbance; determining an equivalent damping parameter of the to-be-tested unit or the to-be-tested station; calculating the damping power at each moment in the disturbance generation process; calculating inertia power at each moment in the disturbance generation process; calculating the frequency change rate of each moment in the disturbance generation process; and in a selected specific time period, determining the equivalent inertia of the to-be-tested unit or the to-be-tested station.

The present invention discloses an adaptive underwater low-frequency underwater acoustic transducer impedance matching device, which comprises a main control circuit, which sends a sweep frequency signal to an underwater power amplifier in a configuration stage and performs impedance matching calculation according to an electrical signal collected by an impedance detection circuit; in an adaptive operation stage, calculates an expected sound source response curve according to the transmitting power of the underwater power amplifier, obtains a power deviation in combination with the sound source signal collected by a hydrophone, obtains an impedance angle according to the electrical signal collected by the impedance detection circuit, and then performs impedance matching modification; an impedance array circuit realizes a circuit with adjustable inductance and inductance parameters to output the maximum power of the underwater acoustic transducer; in the configuration stage, the impedance detection circuit collects electrical signals of the impedance array circuit at various frequency points and transmits them to the main control circuit; in the adaptive operation stage, the electrical signals of the transmitting frequency points are collected and transmitted to the main control circuit; and an impedance switching circuit selectively connects the capacitors and inductors in the impedance array circuit by a relay according to the matching impedance of the main control circuit.

The invention discloses a fluctuation load power calculation method suitable for an electric energy meter and an acquisition terminal, the electric energy meter and the acquisition terminal, and belongs to the field of electric energy metering. The method comprises the following steps: continuously and synchronously sampling voltage and current signals of a power grid and filtering high-frequency harmonics; in-phase and orthogonal signals of voltage and current are adaptively estimated on the basis of a state observer under the condition that a direct current component is not removed, and a state estimation vector is obtained; inputting the voltage state estimation vector into a phase-locked loop, and estimating a voltage angular frequency and a phase through dq transformation; and calculating active power and reactive power according to the current state estimation vector, the voltage phase estimation value and the voltage d-axis component. The invention also provides a corresponding electric energy meter and a use and acquisition terminal. According to the method, the power change can be quickly tracked without lag under the fluctuating load working condition, response delay caused by traditional low-pass filtering is avoided, the dynamic metering precision is effectively improved, and the method is suitable for a complex power grid environment containing a direct-current component.

The invention provides a new energy transmission system new energy-storage cooperative support control method under multiple constraints of a voltage stability domain, and relates to the technical field of power system voltage stabilization. According to the method, a model of reactive power, grid-connected voltage, active power and system parameters is established based on a power flow equation, and a required reactive reference is calculated by combining a set voltage expected value and real-time output power; and under the constraints of the voltage ride-through threshold, the converter capacity, the short-circuit ratio and the power margin, executing a new-storage cooperative voltage support strategy. Under the working conditions of new energy fault ride-through, output power out-of-limit and the like, the voltage stability can be remarkably improved, the output capacity of a new energy station is enhanced, and safe and stable operation of the system is ensured.

Provided is a radio transmitter test system that enables accurate measurement of reflected wave power of an antenna. A radio transmitter test system includes: a power amplifier that amplifies power of a high-frequency signal from a signal generator; a simulative antenna for which a voltage standing wave ratio is variable and that is connected to a coaxial cable in place of an antenna; a directional coupler that is connected between the power amplifier and the simulative antenna, couples the high-frequency signal to the simulative antenna, and outputs traveling wave power and reflected wave power between the power amplifier and the simulative antenna; a power meter connected downstream of the directional coupler; and a control device, wherein the control device calculates, for each voltage standing wave ratio of the simulative antenna, a correlation coefficient indicating a correlation between traveling wave power and reflected wave power of the simulative antenna and traveling wave power and reflected wave power measured by the power meter, and calculates reflected wave power of the antenna by correcting, with the correlation coefficient, the traveling wave power and the reflected wave power measured by the power meter in a state where the simulative antenna is replaced by the antenna.

The invention relates to the technical field of power grid metering, in particular to a power grid time-varying power calculation method based on zero drift calibration, which comprises the following steps of: firstly, constructing a power grid time-varying power calculation system capable of compensating and calibrating phases of voltage and current; the system is composed of a current data acquisition unit, a voltage data acquisition unit, a data processing unit and a calibration unit, the current data acquisition unit is responsible for acquiring power grid current in real time, the voltage data acquisition unit synchronously acquires power grid voltage, and the calibration unit is responsible for outputting standard calibration signals. And the data processing unit calculates the phase difference between the voltage and the current and accurately adjusts the phase, so that effective compensation for zero drift is realized, and finally, the real-time power of the power grid is quickly and accurately calculated. According to the zero drift calibration technology, the time-varying power calculation precision and the reactive compensation effect of the power grid can be effectively improved, the real-time frequency modulation requirement is met, the stability of the power grid is enhanced, and the energy consumption loss is reduced.

The invention relates to an automatic test system for a dual-frequency dual-polarized antenna array plane. The automatic test system comprises a main control computer, a time sequence generator, a beam controller, a vector network analyzer, a radio frequency transceiver module, a power meter, a primary power supply, a power-on and power-off enabling module and the dual-frequency dual-polarized antenna array plane, the main control computer is respectively connected with the time sequence generator, the power-on and power-off enabling module, the vector network analyzer, the primary power supply and the power meter through network cables; a transmit-receive total port of each frequency band of the dual-frequency dual-polarized antenna array plane is connected with the radio frequency transmit-receive module. Each secondary power supply is connected with the primary power supply and the power-on and power-off enabling module. The radio frequency transceiver module is connected with the vector network analyzer through a radio frequency cable; the time sequence generator is connected with the beam controller, the radio frequency transceiver module and the vector network analyzer through control cables. The system has the characteristics of automatic selection of working frequency bands and polarization channels, automatic switching of transmitting and receiving links, real-time monitoring of working current and working temperature, real-time monitoring of transmitting calibration power and the like.

The invention discloses an energy storage system and a method for correcting the collected power of an electric meter of the energy storage system. The method for correcting the collected power of the electric meter of the energy storage system comprises the following steps of S1, controlling the i-th phase independent output power of an inverter; s2, the ammeter collects the voltage, current, active power and apparent power of each phase of the power grid, and calculates the absolute value of the power factor of each phase of the power grid according to the active power and apparent power of each phase; s3, determining the CT wiring condition of the ammeter according to the absolute value of the power factor of each phase of the power grid; and S4, correcting to obtain the real apparent power and the real active power of the ith phase of the power grid by combining the voltage and the current of each phase of the power grid and the CT wiring condition of the electricity meter. According to the energy storage system and the ammeter acquisition power correction method thereof, the CT wiring condition is identified through the absolute value of the power factor, and correct power data can be directly recovered.

The invention discloses an automatic half-wave voltage detection device and method for a crystal modulation experiment, and particularly relates to the technical field of photoelectric measurement. Comprising a tunable laser source (the wavelength of 560-750 nm is adjustable), a crystal modulation module (a high-voltage direct-current power supply and a signal source), an integrated detection module (a horizontal rotating support integrated power meter and a photoelectric converter) and a control module (double data acquisition cards and a Python program). The function implementation mode is as follows: the synchronous measurement of an extreme value method (extracting extreme points by moving average fitting of a U-P curve) and a frequency multiplication method (capturing frequency multiplication distortion points by spectral analysis) is automatically executed through a rotary bracket switching detection unit (the alignment precision is less than or equal to 0.1 mm); and a lambda-Upi relation curve is generated in combination with multi-wavelength scanning, and is compared with a theoretical formula Upi = lambda d / (2n03gamma22L) for analysis. According to the invention, manual intervention and optical path dismounting errors are eliminated, full-process closed-loop control is realized, and high-precision data support is provided for parameter optimization of the electro-optical modulator.

The invention belongs to the technical field of digital circuits, and discloses a ubiquitous metering-oriented adaptive AC / DC wide-range electric energy metering system and method, and the system comprises a PGA, an ADC, a waveform extreme point judgment module, a PGA multiple calculation module and a two-dimensional AC / DC recognition module. Quantized burrs are inhibited; the PGA gain is dynamically adjusted based on the effective bit width occupancy rate, so that the signal amplitude is adaptively matched with the optimal range of the ADC; the frequency and amplitude features are combined to construct two-dimensional recognition logic, and alternating current and direct current signals are accurately distinguished; and a cooperative feedback mechanism of gain adjustment and AC / DC identification is established, and differential power calculation is realized. The method solves the problems that a traditional scheme is rigid in gain configuration, low in extreme value extraction precision, high in alternating current and direct current misjudgment rate and poor in system collaboration, and has the advantages of being high in self-adaption, accurate in recognition, good in real-time performance and flexible in scene adaptation.

The invention relates to a receiver and a gain control method and device applied to the receiver. The receiver comprises a low noise amplifier, a frequency mixer, a first branch, a second branch, a power calculation module and a control module. According to a modulation mode of a radio signal received by a low-noise amplifier, the bandwidth of a low-pass filter in a first branch and / or a second branch is configured by adopting a corresponding bandwidth configuration mode, and whether the signal amplitude is from an in-band useful signal or an out-of-band interference signal is judged by utilizing an amplitude difference brought by a setting difference. Therefore, the gain gear can be switched more accurately to complete the setting of the optimal signal-to-noise ratio.

The present application belongs to the technical field of new energy network construction type converter, and particularly relates to an asymmetric damping voltage controller for a network construction type converter and a control method thereof, comprising the following steps: step 1: obtaining the inductance current of a filter and the capacitance voltage in the current system; step 2: a power calculation module calculates active power and reactive power; step 3: an active control loop and a reactive control loop obtain the active power and the reactive power; the phase angle generated by the active loop control and the reference value of the inverter output voltage amplitude are calculated; step 4: the asymmetric damping voltage controller obtains the phase angle, the reference value of the inverter output voltage amplitude and the capacitance voltage; and the asymmetric damping voltage controller is used to suppress power oscillation to generate an output current reference value; and a current controller is used to generate a modulation voltage signal. The present application provides an effective technical means for improving the stability and dynamic performance of power electronic equipment in a high penetration rate new energy scene.

The application belongs to the technical field of power electronic control, and particularly relates to a kind of energy storage converter parallel control method and system.The method comprises: after Clark transformation, Park transformation of three-phase voltage signal and three-phase current signal output by inverter, active power and reactive power are calculated;Reference value of voltage loop and current loop is calculated, and prediction value is superimposed on current loop to obtain direct axis front end voltage and cross axis front end voltage, and then direct axis voltage and cross axis voltage are calculated;Direct axis voltage and cross axis voltage are subjected to SPWM modulation, and inverter bridge arm switch tube is driven to turn on and off to control inverter output.The prediction value superimposed in the application can quickly compensate the reference value required by current loop when load mutates, and then maintain the stability of voltage.

The invention relates to the technical field of hoisting machinery safety monitoring and control, and particularly discloses a portal crane moment limit protection method and system based on current verification. Real-time detection signals of a hoisting mechanism are obtained through a moment sensor, and a three-axis accelerometer is arranged at the connecting position of a steel wire rope to obtain swing signals; analyzing a jitter interference factor based on the steel wire rope jitter displacement, and judging the accuracy of a detection signal; on the premise that the signal is accurate, operation state detection of primary mechanical power calculation is carried out, then secondary operation state detection is carried out by combining the rated working current of the lifting frequency converter calculated by the detection signal and the real-time working current collected by the PLC, and the lifting mechanism is controlled to operate according to the detection result. Through multi-dimensional signal fusion and secondary verification, the detection precision and the overload judgment reliability are improved, the overload operation of equipment can be effectively prevented, and the operation safety of the crane and the service life of the equipment are guaranteed.

This invention discloses a method and system for measuring the frequency response of an electro-optic modulator based on a spectral analyzer. The system includes a laser, a 95:5 single-mode fiber splitter, an optical power meter, an electro-optic modulator, a control power supply, an RF signal generator, and a spectral analyzer. The measurement method includes the following steps: calculating a calibration factor to correct optical power drift through optical path splitting, driving the modulator by applying several discrete single-frequency RF points, and measuring the carrier power P0(f) using the spectral analyzer. i ) and the first-order sideband power P1(f i ), and determined by the power ratio R(f) i )=10 (P1‑P0) / 10 Combining the Jacobi–Anger expansion / Bessel function relation, the phase modulation index β(f) is solved by inverse solution. i Then, the phase transfer function H(f) at each frequency point is calculated and fitted. i The continuous frequency response S of the modulator is obtained. 21 This invention simplifies the testing process, reduces reliance on high-speed photodetectors and vector network analyzers, and enables high-precision electro-optic response testing of electro-optic modulators at high frequencies.

The invention discloses an active voltage supporting method and system based on a linearized reactive power-alternating voltage relation and a storage medium, and relates to the field of electric power engineering. The method comprises the following steps: monitoring active power and reactive power of an AC power grid; calculating a power ratio based on the active power and the reactive power; whether the power ratio meets the requirement of a preset value or not is judged, and if yes, the active power and the voltage amplitude are monitored on line under different power levels, and the linear relation between the active power and the voltage amplitude is established through data fitting. According to the invention, the linear relation between the reactive power and the AC voltage is accurately modeled, and real-time data feedback is combined, so that accurate control of voltage regulation is realized.

The invention relates to the technical field of power electronics, in particular to an auxiliary inverter. Before the output contactor group is closed, according to the current data acquired by the output current sensor group, estimating the front voltage amplitude of the contactors; calculating a d-axis component and phase information of the single-phase output branch voltage; calculating active power and reactive power according to the current data acquired by the output current sensor group; the droop control unit calculates droop control target frequency according to the active power and calculates droop control target voltage according to the reactive power; before an output contactor group is closed, a d-axis closed-loop output voltage value is adjusted by taking an axis component of a single-phase output branch voltage as a target value and taking a voltage amplitude as a feedback value; and after the output contactor group is closed, the droop control target voltage is taken as a target value, the shaft component of the single-phase output branch voltage is taken as a feedback value, and a shaft closed-loop output voltage value is adjusted.

The utility model relates to the technical field of IGBT (Insulated Gate Bipolar Translator) devices, in particular to an adjustable IGBT power distribution circuit, which comprises a driving module, an IGBT module, a measuring module and a main control module which are electrically connected in sequence, and the measuring module comprises a current sampling unit, a voltage sampling unit, a first analog-to-digital conversion unit and a second analog-to-digital conversion unit. The current sampling unit is used for acquiring current data entering a collector electrode of the IGBT module, the voltage sampling unit is used for acquiring voltage data of the collector electrode of the IGBT module, and the main control module calculates a power value according to the current data and the voltage data and controls the driving module. According to the utility model, the synchronous acquisition and high-precision digitalization of current and voltage signals are realized, the signal interference is obviously reduced, the accuracy of power calculation is ensured, the main control module dynamically adjusts the output of the driving module based on a real-time power value, the load change can be quickly responded, the power distribution efficiency is optimized, and local overload or resource waste is avoided.

The present invention relates to the technical field of wireless power transfer. Specifically disclosed are a clock synchronization-based method and system for calculating the efficiency of a dynamic wireless charging system. The method comprises: providing a satellite-disciplined clock at both a transmitting end and a receiving end; generating pulse signals of a first frequency and a second frequency and timestamp signals by means of satellite-disciplined clocks; when a control unit of the receiving end / the transmitting end receives the pulse signal of the first frequency, starting counting on the basis of the pulse signal of the second frequency, when the count reaches a preset count value, calculating the average power of a sampled voltage and a sampled current within the preset count value, and marking the average power with a timestamp tag on the basis of the timestamp signal; and when timestamp tags of the transmitting end and the receiving end are the same, on the basis of the power of the transmitting end and the power of the receiving end, calculating the system efficiency corresponding to this moment. In the present method and system, by using the satellite-disciplined clocks to realize time synchronization between the transmitting end and the receiving end, system efficiency can be calculated with high accuracy and minimal error.

The application discloses an inverter voltage sag optimization method and system based on voltage amplitude-d-axis current and frequency-q-axis current droop control, aiming to generate a reference voltage amplitude by a d-axis current and a reference frequency by a q-axis current. The application designs voltage amplitude-d-axis current and frequency-q-axis current droop control, directly obtains the reference voltage amplitude and frequency only by the d-axis current and the q-axis current. Compared with the traditional power droop to generate the voltage frequency reference, the application can effectively inhibit the amplitude of the sudden increase of the current during the voltage sag, optimize the transient characteristics of the converter under short-circuit fault, and achieve the purpose of protecting the inverter. Meanwhile, the active power and reactive power calculation and the corresponding filter link are cancelled, the control process is simplified, and the controller computing power is saved.

The invention discloses a polarization adjusting device and a polarization adjusting method. The polarization adjusting device comprises a light source assembly, a micro-ring resonant cavity, a photoelectric detector, a digital oscilloscope, an arbitrary waveform generator and a power meter module. The light source assembly comprises a light source, a scanning module and a polarization controller connected with the transmission end of the light source. The micro-ring resonant cavity comprises a first output part and a coupling part coupled with the polarization controller. The photoelectric detector is connected with the first output part. The digital oscilloscope comprises a first input part and a second input part used for receiving an electric signal output by the photoelectric detector, and the digital oscilloscope can display the trough of the Lorentz curve. The arbitrary waveform generator includes a second output portion and a third output portion. The second output part is connected with the light source. The third output part is connected with the first input part. The power meter module is connected with the scanning module. According to the polarization adjusting device and the polarization adjusting method, the light source assembly can be quickly and efficiently adjusted to be in the TE polarization state or the TM polarization state.

A system for detecting angle of arrival comprises an array of metamaterial or resonant elements that share a dielectric substrate and a metallic ground layer, wherein each of the metamaterial or resonant elements includes a switchable component; an opening in the ground layer configured to couple an incident wave signal; and a waveguide below the ground layer configured to guide the coupled signal to a receiving circuit including an intensity or power meter. A method for detecting angle of arrival comprises providing the system as described above; coupling an incident wave signal to the shared substrate; guiding the coupled signal from the shared substrate to the receiving circuit via the waveguide; measuring the coupled signal via intensity or power meter of the receiving circuit; and calculating an angle of arrival based on the measured intensity or power.