23results about "Frequency to phase shift conversion" patented technology

A leakage detection device that applies a leakage detection method, is applied to a vehicle, and includes a detection unit, a sampling unit, and a signal processing unit. The detection unit is separately connected to two-phase discharge paths of a power supply and is used to separately establish detection loops of the two-phase discharge paths when the power supply discharges. The sampling unit is electrically connected to the detection unit and is used to collect a first detection voltage of a first-phase discharge path and / or a second detection voltage of a second-phase discharge path from the detection loop. The signal processing unit is connected to the sampling unit, asynchronously receives the first detection voltage and the second detection voltage from the sampling unit, and is used to determine the leakage characteristics of the power supply according to the first detection voltage and the second detection voltage.

According to an embodiment of the invention, a system frequency detector is provided and includes an orthogonal coordinate signal generator generating an orthogonal two-phase voltage signal from a three-phase voltage signal of three-phase alternating current power of a power system by converting the three-phase voltage signal into a two-phase voltage signal orthogonal to the three-phase voltage signal, converting the two-phase voltage signal into a voltage signal of a rotating coordinate system, calculating a moving average of the voltage signal of the rotating coordinate system, and performing an inverse transformation of the voltage signal of the rotating coordinate system after calculating the moving average; and a frequency calculator including an angular frequency calculator calculating an angular frequency of the power system based on the two-phase voltage signal, and an arithmetic unit calculating a system frequency of the power system from the angular frequency, the frequency calculator further including a low-pass filter provided in series with the arithmetic unit, the low-pass filter suppressing a high frequency component of the system frequency. Thus, a system frequency detector is provided in which the change of the system frequency can be quickly tracked and an erroneous detection of the system frequency can be suppressed even when a system disturbance occurs.

The present disclosure relates to techniques for measuring slew rate in a current integrating phase interpolator. An apparatus is described that includes a current integrating phase interpolator core having a programmable bias current; an inverter circuit coupled to an output of the current integrating phase interpolator core for receiving a signal containing a periodic sawtooth waveform therefrom; a digital-to-analog (D / A) converter for setting an input common mode voltage of the inverter circuit; a duty cycle measurement (DCM) circuit for measuring a duty cycle distortion (DCD) of a clock signal output from the inverter circuit; and a circuit for calculating a difference between a first state of the DCD of the clock signal corresponding to the inverter circuit being set to a high voltage input common mode voltage and a second state of the DCD of the clock signal corresponding to the inverter circuit being set to a low voltage input common mode voltage.

The present invention relates to a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof and, more specifically, provides a high-frequency driven high-speed diagnostic electrostatic probe system and a method thereof, wherein a high-speed diagnosis for the characteristics of plasma is enabled by using a fitting function without a high impedance choke filter after a plurality of pieces of current waveform data, which are measured by applying a high-frequency bias voltage to a probe while shifting the phase of same, are phase-retrieved and averaged and then processed in accordance with a preset methodology.

A partial discharge measurement system is disclosed. The present system comprises: a reference signal generation apparatus that is located in a real space and outputs a reference signal for phase correction; and an acoustic camera that measures partial discharge on the basis of a partial discharge acoustic signal generated from a target to be measured. The acoustic camera includes: an acoustic signal reception unit that receives the partial discharge acoustic signal generated from the target being measured; and a data processing unit that generates partial discharge acoustic data for the partial discharge acoustic signal and phase-corrects the partial discharge acoustic data on the basis of a phase difference between the reference signal and the partial discharge acoustic signal, so as to generate phase-corrected partial discharge acoustic data.

A frequency detection apparatus (7) comprises a data downsampling unit (10) that extracts, as first downsampled data, pieces of data every m samples from a sequence of quantized data samples of a measured signal, and extracts, as second downsampled data, pieces of data which are offset by an offset number with respect to the respective pieces of data extracted every m samples, and a phase difference calculation unit (12) that calculates a phase difference between the phases of the first downsampled data and the phases of the second downsampled data. The frequency detection apparatus (7) also comprises a phase difference calibration unit (13) that acquires calibrated data which corresponds to the phase difference calculated by the phase difference calculation unit (12) and calibrates the phase difference according to the calibrated data, an aliasing order calculation unit (14) that calculates a Nyquist aliasing order of the first downsampled data on the basis of the calibrated phase difference from the phase difference calibration unit (13), and a frequency calculation unit (15) that calculates the frequency of the measured signal using a frequency calculated by a frequency phase calculation unit (11) and the Nyquist aliasing order calculated by the aliasing order calculation unit (14).

This quantum sensor system comprises: a magnetic sensor module disposed spaced apart from a magnetic device to measure a magnetic field from the magnetic device and having a second temperature sensor; and a main circuit operably coupled to the magnetic sensor module and having a first temperature sensor. The main circuit is configured to measure the magnetic field in a specific frequency band on the basis of the temperature value difference between a first temperature value measured by the first temperature sensor and a second temperature value measured by the second temperature sensor.

This invention relates to the field of electrical parameter measurement and analysis technology, and particularly to a method, system, and medium for measuring the initial phase of amplitude-frequency oscillations in AC power systems. The method includes: acquiring three-phase voltage sampling signals; constructing a mathematical model of the oscillation signal based on the sampling signals; performing coordinate transformation on the sampling signals to obtain direct-axis and quadrature-axis components; constructing an amplitude oscillation signal based on the direct-axis and quadrature-axis components and separating the amplitude modulation component; performing analytical expansion of the frequency modulation term based on the mathematical model of the oscillation signal to obtain an analytical expression for the frequency oscillation; performing frequency domain transformation on the time-domain signals corresponding to the amplitude oscillation signal and the analytical expression for the frequency oscillation, respectively; determining the initial phase of the amplitude modulation based on the phase information of the disturbance frequency component; and calculating the initial phase of the frequency modulation based on the phase relationship between the subsynchronous or supersynchronous component and the power frequency component. This invention effectively solves the problem of accurately measuring the initial phase of oscillations when amplitude-frequency oscillations occur at the grid connection point.

This invention provides a method and system for simultaneous measurement of Doppler frequency shift (DFS) and angle of arrival (AOA) based on a dual-polarization-dual-electrode Mach-Zehnder modulator (Dpol-DDMZM). The Dpol-DDMZM modulates the echo signals and local oscillator signals received from two antennas in parallel onto an optical wave in OCS mode. After a 90° polarization rotation and orthogonal polarization combining, the resulting polarization-multiplexed optical wave carries the echo and local oscillator signals. These signals are then filtered out by an optical bandpass filter (OBPF) to remove the positive first-order sidebands, and demultiplexed into two optical signals by a polarization beamsplitter (PBS). These signals are then converted into photoelectric signals and differentially processed by a balanced detector (BPD). The output photocurrent contains information on the Doppler frequency shift (DFS) and angle of arrival (AOA). This scheme utilizes photocurrent phase-AOA mapping to achieve simultaneous measurement of DFS and AOA. Furthermore, the modulator operates in OCS mode, improving the measurement accuracy of DFS and AOA. The system has a simple structure and high stability.

The present invention relates to a measured waveform phase control device and method of a merging unit (MU) which obtains an accurate value at a sampling command time, corrects characteristics of a change in temperature of an oscillator element, and also corrects delay characteristics of an analog sensing element at the sampling command time. A measured waveform phase control device of an MU of the present invention includes a temperature sensor which provides ambient temperature information, an oscillator element which provides an oscillation signal, an analog-digital converter (ADC) which samples an analog current sensing signal or voltage sensing signal as a digital signal, and a sampling clock providing part which provides a sampling clock to the ADC on the basis of the ambient temperature information and the oscillation signal under control of a sampling request part.

In certain aspects, an apparatus includes a power detector coupled between a power amplifier and an antenna and a voltage detector coupled between the power amplifier and the antenna. The apparatus also includes a phase shifter coupled to the power detector and a load measurement circuit coupled to the power detector, the voltage detector, and the phase shifter.

The invention improves an accuracy of an impedance analysis used for a battery condition diagnosis, and so on. An impedance measurement device comprises: an applicator that applies a voltage or a current consisting of a staircase wave with 3 or more steps to any electrochemical system as an input signal; a measurer that measures a voltage input value or a current input value of the input signal and a current response value or a voltage response value corresponding to the input signal as a response signal; and a calculator that calculates impedance values at plural frequencies from the current response value or the voltage response value of the response signal.

The utility model provides a sampling device for a single-current harmonic phase method, which relates to the field of power electronics and comprises a sampling device body, and a, b and c are arranged on the surface of the sampling device body. The sampling device main body comprises a sampling module, a harmonic extraction module, a phase calculation module, a resistive current calculation module, a data processing and storage module, a communication module and a remote monitoring module; according to the utility model, inversion is carried out through the phase alignment relation of the third harmonic and the fundamental wave, the fundamental wave voltage vector at the end part of the lightning arrester is indirectly obtained, the secondary voltage signal of a voltage transformer does not need to be extracted, the operation is simpler, the safety risk is low, and the detection accuracy is improved by adopting a single-phase current harmonic detection method to carry out current sampling and Fourier decomposition. The problems that the sensitivity of a leakage total current detection method is not enough, and comparison signals need to be collected from a voltage transformer are solved, the monitoring efficiency is improved, the maintenance cost is reduced, and the safety is improved.

Systems, components, methods, and algorithms for generating difference data are described. A computer-implemented method includes directing a first pulse of charged particles toward a sample. The method can include generating first detector data based at least in part on interactions between the charged particles of the first pulse and the sample. The method can include directing a second pulse of charged particles toward the sample. The method can include generating second detector data based at least in part on interactions between the charged particles of the second pulse and the sample. The method can also include generating difference data using the first detector data and the second detector data, wherein the difference data describe a change between an “on” state of the sample and an “off” state of the sample.

Provided is a frequency detection device (8) comprising: a frequency / phase calculation unit (11) that calculates the frequency of first quantized data and the phase of the first quantized data of a signal to be measured; and a phase difference calculation unit (12) that calculates the phase of second quantized data, which is data delayed from the first quantized data, and calculates the phase difference between the phase of the first quantized data and the phase of the second quantized data. The frequency detection device (8) comprises: a phase difference calibration unit (13) that acquires calibration data corresponding to the phase difference calculated by the phase difference calculation unit 12 and calibrates the phase difference according to the calibration data; a folding order calculation unit (14) that calculates the Nyquist folding order of the first quantized data on the basis of the phase difference after calibration by the phase difference calibration unit (13); and a frequency calculation unit 15 that calculates the frequency of the signal to be measured using the frequency calculated by the frequency / phase calculation unit (11) and the Nyquist folding order calculated by the folding order calculation unit (14).

The application relates to a system-side harmonic impedance estimation method and device thereof, a storage medium and an electronic device, which comprises the following steps: obtaining an h-order harmonic parameter equivalent circuit simplified according to power grid characteristics; h is a positive integer greater than or equal to 2; a system-side harmonic impedance estimation mathematical model is established according to the h-order harmonic parameter equivalent circuit; the amplitude and phase data of harmonic voltage and harmonic current at a PCC are obtained; the harmonic voltage amplitude data at the PCC are divided into several stable intervals; a variable coefficient regression model between harmonic voltage phasors and harmonic current phasors is established according to the amplitude and phase data of the harmonic voltage and the harmonic current in the several stable intervals; the optimal window width of the variable coefficient regression model kernel function is selected; and the system harmonic impedance is calculated according to the variable coefficient regression model and the optimal window width.

The invention relates to the technical field of electric parameter measurement and analysis, in particular to an amplitude-frequency oscillation initial phase measurement method and system for an alternating-current power system and a medium, and the method comprises the steps: obtaining a three-phase voltage sampling signal; constructing an oscillation signal mathematical model based on the sampling signal; performing coordinate transformation on the sampling signal to obtain a direct-axis component and a quadrature-axis component; based on the direct-axis component and the quadrature-axis component, constructing an amplitude oscillation signal and separating to obtain an amplitude modulation component; based on the oscillation signal mathematical model, analyzing and expanding the frequency modulation item to obtain a frequency oscillation analysis expression; frequency domain transformation is carried out on the amplitude oscillation signal and a time domain signal corresponding to the frequency oscillation analytical expression, an amplitude modulation initial phase is determined based on phase information of the disturbance frequency component, and a frequency modulation initial phase is calculated based on the phase relation between the subsynchronous component or the supersynchronous component and the power frequency component. According to the invention, the problem that it is difficult to accurately measure the oscillation initial phase when amplitude-frequency oscillation occurs to the grid-connected point voltage is effectively solved.

Provided is a sample inspection apparatus capable of identifying a capacitive fault or a potential faulty point where an electrical tolerance is low. The sample inspection apparatus includes: a charged particle optical system configured to irradiate a sample 19 with a charged particle beam; a first probe 21a configured to come into contact with the sample; an amplifier 23 having an input terminal to which the first probe is connected; and a phase detection unit 40 to which an output signal of the amplifier is input, in which an AC voltage is applied to the first probe, and the phase detection unit detects the output signal of the amplifier using a reference signal synchronized with the AC voltage and having the same frequency as the AC voltage.

A frequency detection device (7) comprises: a data thinning-out unit (10) that extracts, as first thinned-out data, data of every other sample from a sample sequence of quantized data, which is a signal obtained by quantizing a signal to be measured, and extracts the remaining data as second thinned-out data; a frequency / phase calculation unit (11) that calculates the frequency of the first thinned-out data and the phase of the first thinned-out data; a phase difference calculation unit (12) that calculates the phase of the second thinned-out data and calculates the phase difference between the phase of the first thinned data and the phase of the second thinned data; a phase difference calibration unit (13) that acquires calibration data corresponding to the phase difference and calibrates the phase difference in accordance with the calibration data; a folding order calculation unit (14) that calculates the Nyquist folding order of the first thinned data on the basis of the calibrated phase difference; and a frequency calculation unit (15) that uses the frequency and the Nyquist folding order to calculate the frequency of the signal to be measured.

The invention relates to a method for measuring an antenna pattern (AP) of an antenna (1) on a first flying object (RSS) by means of a second flying object (MES), wherein the first flying object (RSS) moves in orbit along a first elliptical path (EB1) around a celestial body (100) and the second flying object (MES) moves in orbit along a second elliptical path (E2) around the celestial body (100), wherein during the movement of the first and second flying objects (RSS, MES), the antenna (1) emits antenna radiation along a main beam direction (HS) and / or receives antenna radiation from the second flying object (MES), wherein the main beam direction (HS) has a predetermined lateral viewing angle (θoff), which is an angle of rotation equal to or unequal to zero about the direction of movement of the first flying object (RSS) relative to the direction to the centre (M) of the celestial body (100), wherein signal values (SV) of the antenna (1) are obtained by means of the second flying object (MES) and at least a part of the antenna pattern (AP) is determined therefrom. In the method according to the invention, the first elliptical path (EB1) and the second elliptical path (EB2) are adjusted relative to each other in such a way that the signal values (SV) obtained during one revolution belong to a fixed predetermined azimuth angle (ξcut) and different polar angles (ψ) with respect to the antenna (1), wherein the predetermined azimuth angle (ξcut) represents an angle of rotation about the main beam direction (HS) and the different polar angles (ψ) represent angles of inclination relative to the main beam direction (HS).

The quantum sensor system includes: a magnetic sensor module disposed separately from a magnetic device to measure a magnetic field from the magnetic device, and provided with a second temperature sensor; and a main circuit operably coupled with the magnetic sensor module and provided with a first temperature sensor. The main circuit is configured to measure the magnetic field in a specific frequency band on the basis of a temperature value difference between a first temperature value measured by the first temperature sensor and a second temperature value measured by the second temperature sensor.

A method (1100) of calibrating a power measuring function (516; 716; 946) of a wireless power device (510; 710; 930) is presented. An alternating electric signal is fed (1110) through a wireless power transmitter coil (520; 720; 920) to drive the wireless power transmitter coil at an operating point. Voltage measurements and current measurements are performed (1120) upon said alternating electric signal or upon a current signal resulting therefrom in the wireless power device. A series of voltage values and a series of current values are produced (1130) from the voltage measurements and current measurements. A power value is calculated (1140) from the produced series of voltage values and series of current values. The method then assesses (1150) whether the calculated power value meets a specification. If not, the method introduces (1160) a compensatory change in either of the produced series of voltage values and series of current values to account for a phase shift between the voltage measurements and current measurements at said operating point, and stores (1170) the compensatory change for the wireless power device (510; 710; 940). This enables the power measuring function (516; 716; 946) of the wireless power device (510; 710; 940) to produce wireless power measurement results at said operating point which are consistent with said specification.