19 results about "Phase deviation" patented technology

The application discloses a kind of calibration method and device for rotary variation soft decoding, calibration method includes: according to N times oversampling frequency respectively sampling rotary variation feedback sine and cosine feedback signal envelope surface and obtaining positive, cosine oversampling signal;Positive, cosine oversampling signal is handled to obtain the zero position offset of rotary variation positive, cosine envelope signal;Positive, cosine oversampling signal is handled to obtain the amplitude of rotary variation positive, cosine envelope surface;Positive, cosine oversampling signal is handled to obtain the phase deviation of rotary variation positive, cosine envelope surface;Through the amplitude, zero position offset, phase deviation obtained by calculation, the envelope surface of rotary variation positive, cosine is compensated, and the signal after compensation is sent into phase-locked loop to obtain the angle and rotational speed information of rotary variation.The application obtains accurate amplitude, zero position offset, phase difference in turn, and then carries out error compensation, finally obtains corrected positive, cosine signal, effectively guarantees the efficiency of motor.

The application provides a 2*2 beam splitter based on an error compensation structure, an interference unit, an imaging system and a method, the 2*2 beam splitter comprising: a first coupler, a second coupler, a first phase shifter and a second phase shifter; wherein the first phase shifter is connected on an optical path between the first coupler and the second coupler, and the second phase shifter is connected at an input port of the first coupler; the first phase shifter is configured to compensate for a phase deviation of the first coupler caused by a process error by adjusting a phase value of the first phase shifter; and the second phase shifter is configured to compensate for a phase deviation of the second coupler caused by a process error by adjusting a phase value of the second phase shifter. The application solves the problem that a traditional multi-mode interference coupler causes a misalignment of a light splitting ratio due to a process error, and further causes a decline in imaging resolution.

This invention relates to the field of optical detection technology, specifically a multifocal parallel phase extraction and alignment system based on a spatial light modulator, comprising: a wavefront modulation module, a parallel detection module, an information extraction module, a parameter calculation module, and a correction and execution module. The wavefront modulation module loads a phase modulation pattern through a spatial light modulator, generating a complex wavefront containing multiple diffraction orders via the objective lens, forming multiple spatially separated detection focal spots on the sample surface. The parallel detection module receives the reflected light signals from each focal spot in parallel through an array detector. The information extraction module analyzes the signals and extracts the phase offset of each focal spot, constructing a mapping set between position and phase offset. The parameter calculation module calculates the tilt angle and field curvature distribution parameters based on this set. The correction and execution module generates a comprehensive correction signal to drive the objective lens or sample stage to perform multidimensional attitude adjustments. This system achieves multifocal parallel detection and synchronous parameter calculation, improving alignment efficiency and accuracy.

The present invention relates to a phase control loop (1) comprising a phase detection unit (2) for detecting a phase of a reference signal (100) and for outputting a measurement signal φ meas , a phase deviation detection unit (3) for generating an error signal φ err from the measurement signal φ meas and a target signal φ tgt , a loop filter (4) for filtering the error signal φ err, a modulator unit (5) for modulating the filtered error signal and generating a tune signal (500), and an oscillator (6) for generating an output signal (300) from the tune signal (500), wherein a feedback signal (200) formed from an output signal (300) of the phase-locked loop (1) is supplied to the phase detection unit (2), and wherein the phase-locked loop (1) further comprises: a divider unit (8) configured to generate a modulator clock signal (800) from an oscillator clock signal (400) of the oscillator (6) and to supply the modulator clock signal (800) to the modulator unit (5), and a sampler unit (15) configured to detect an offset (900) between the reference signal (100) and the modulator clock signal (800) by the offset (900) in determining the error signal φ err to take precise account of.

A method for optimizing a source profile and wavefront profile to simulate a lithography process is disclosed. More particularly, a method for minimizing a phase offset between diffraction orders in a source profile to generate an optimized source profile and an optimized wavefront profile, using a cost function with a phase cost term is disclosed. The disclosed method may further include a diffraction overlap penalty term in the cost function.

The present invention relates to a phase control loop (1) comprising a phase detection unit (2) for detecting a phase difference between a reference signal (100) and a feedback signal (200) and for outputting a measurement signal φ representing the phase difference. meas , a phase deviation detection unit (3) for generating an error signal φ err from the measurement signal φ meas and a target signal φ tgt , a loop filter (4) for filtering the error signal φ err, a modulator unit (5) for modulating the filtered error signal and generating a tune signal (500), and an oscillator (6) for generating an output signal (300) from the tune signal (500), wherein a feedback signal (200) formed from the output signal (300) of the phase-locked loop (1) is supplied to the phase detection unit (2), wherein the modulator unit (5) comprises a modulator (7) and a scrambler (9) downstream of the modulator (7), and wherein the modulator unit (5) comprises an impairment module (10) configured to determine signal impairment from metadata (600) of the scrambler (9) and from predefined calibration data (400), and configured to feed signal impairments (700) back to the modulator (7).

This invention discloses an adaptive differential evolution cooperative position estimation method for meteor radar phase calibration, comprising: acquiring meteor trail angle of arrival (AHA) data and meteor trail distance data; constructing a composite objective function based on the meteor trail AHA and distance data; using the composite objective function, employing adaptive differential evolution to search for multi-channel phase deviations, and iteratively performing virtual half-wavelength baseline inversion of meteor trail positions until the composite objective function converges to a global minimum, ultimately obtaining high-precision multi-channel phase calibration results. This method requires no external reference signal, is stable and usable in all weather conditions, continuously and automatically updates calibration parameters, is simple to implement and low in cost, and has higher receiving channel phase calibration accuracy than existing internal calibration methods.

The present application relates to the field of three-dimensional optical precision measurement, and discloses a three-dimensional profile measurement method for the inner cavity surface of a purple sand pot based on optical measurement. The method constructs a multi-band spectral light source system, projects a light beam to the inner cavity surface according to a preset sequence of incident angles, and synchronously collects multi-spectral interference fringe images and ambient light noise data. According to the correlation between image distortion and light noise, a surface phase shift atlas is generated, and the measurement area and the occluded area are divided based on phase continuity. Phase unwrapping and geometric calculation are performed on the complete area to generate an initial three-dimensional point cloud, the boundary information of the occluded area is fused to complete hole speculation and surface extension, and a preliminary three-dimensional profile model is constructed. The model is registered with a standard theoretical model to generate a surface profile deviation field and output a process analysis report. The present application realizes accurate identification of the occluded area of a complex inner cavity through phase topology analysis, and uses spatial analysis of the deviation field to enable the measurement result to directly guide production process improvement.

This invention discloses a self-zeroing fluxgate current sensor, belonging to the field of current sensor technology, aiming to solve the problem of zero-point bias error caused by the asymmetry of amplitude or phase of the two excitation signals in existing fluxgate current sensors. It includes an excitation signal generation circuit, two excitation cores and coils, an adder, an adjustable bandpass filter, an amplitude adjustment branch, a phase adjustment branch, a zero-adjustment controller, and a signal conditioner. The amplitude adjustment branch extracts the amplitude matching error of the two excitation induction signals, the phase adjustment branch extracts the phase deviation of the two excitation induction signals, the adjustment controller calculates the gain adjustment value and the phase adjustment value, and the signal conditioner uses the gain adjustment value and the phase adjustment value to adjust the gain and phase of one of the excitation drive signals in a closed loop, making the two excitation drive signals equal in amplitude and opposite in phase, directly eliminating the amplitude error and phase error from the excitation source, realizing mutual cancellation of the fundamental wave and odd harmonics, and fundamentally suppressing zero-point bias.

The application discloses a method and equipment for extracting same-frequency aliasing signals in a shear atomic interferometer. The same-frequency aliasing interference signals to be fitted are regarded as simple harmonic signals, fitted effective contrast and fitted effective phase are obtained based on the simple harmonic signals, and the contrast prior value of the first atomic interference signal and the contrast prior value of the second atomic interference signal are obtained by inversion. The same-frequency aliasing interference signals to be solved are regarded as simple harmonic signals, the measured effective contrast and the measured effective phase are obtained based on the simple harmonic signals, the absolute value of the phase deviation of the first atomic interference signal to be solved and the second atomic interference signal to be solved is calculated, and the phase of the first atomic interference signal to be solved and the phase of the second atomic interference signal to be solved are calculated. The application can reconstruct the atomic interference signals from the same-frequency aliasing interference signals to be solved, realizes the restoration of the original signals, and realizes the accurate separation of the atomic interference signals.

The application relates to the technical field of optical detection, and discloses an optical element subsurface defect detection method and system. The method comprises the following steps: performing full-area scanning on an optical element to obtain a backscattering light signal; performing light filtering on the backscattering light signal to obtain a depth polarization scattering light signal group; performing coherent light compensation enhancement on the depth polarization scattering light signal group to obtain an enhanced polarization scattering light signal group; analyzing the enhanced polarization scattering light signal group in terms of light signal characteristic parameters, and performing multi-level fusion on light intensity distribution characteristic parameters, phase shift characteristic parameters and polarization state deflection degree characteristic parameters corresponding to the analyzed signal group to obtain a comprehensive deviation vector; comparing and analyzing the comprehensive deviation vector with preset standard parameter data to determine defect anomaly positioning data; performing full-attribute standardization judgment on the optical element to obtain a subsurface defect detection result; and the application can improve the accuracy of optical element subsurface defect detection.

This invention discloses a dynamic adjustment method for power stability of a mobile power bank based on time-series modeling, relating to the field of mobile power bank technology. The method includes: real-time acquisition of the output current and voltage waveforms of the mobile power bank within a continuous time unit; extraction of the periodic decay characteristics of the waveform oscillation frequency and the instantaneous response hysteresis characteristics during load abrupt changes; establishment of a power compensation function based on the correlation between the decay and hysteresis characteristics; prediction of the probability of load abrupt changes in subsequent time units using the compensation function; generation of dual adjustment parameters including amplitude compensation and phase calibration direction when a phase shift is detected between the current waveform oscillation frequency and the historical decay trajectory; real-time adjustment of the switching device conduction sequence based on the dual parameters; comparison of the actual output waveform with the expected trajectory of the compensation function after adjustment; and automatic backtracking correction of the decay rate weight coefficient when the deviation exceeds a threshold. This invention effectively suppresses voltage drops, overshoot, and high-frequency oscillations, ensuring stable operation of connected devices.

The application discloses a collimation regulation system and method based on wave aberration optimization, relates to the technical field of collimation regulation, and obtains a thermal response time starting point by determining the phase offset trend of a thermal spot appearing instant and the relationship between thermal flow distribution and wavefront distortion; energy section regulation is implemented on a light beam irradiation area according to the time starting point, an intermittent energy release process is established by introducing thermal flow distribution results; on this basis, phase drift of a turning mirror reflection area is tracked, and the angle distribution order of an optical path is adjusted; a phase steady-state maintenance process is constructed in combination with the angle distribution order, the wavefront recovery duration is prolonged; collimation self-balancing regulation of the light beam is implemented in the thermal spot back-falling stage, and the convergence of the phase and the incident angle rhythm is realized. The application establishes a time directional collimation regulation mechanism with the wavefront change as the core, cooperates energy and phase control in the whole process of thermal spot formation and back-falling, suppresses phase mutation and optical axis drift, maintains wavefront continuity and energy center consistency, and realizes long-term stability of the collimation state.

An optical switch includes an input splitter, a phase shift section, and an output combiner. The input splitter splits a first optical signal input into a first single mode input onto first and second multimode outputs and splits a second optical signal input into a second single mode input onto the first and second multimode outputs. The phase shift section has a phase shifter and first and second multimode waveguides coupled with the first and second multimode outputs, respectively. The phase shifter selectively causes a multimode optical signal within the first multimode waveguide to undergo a phase shift relative to a multimode optical signal within the second multimode waveguide. The multimode optical signals each include portions of the first and second optical signals. The output combiner receives the multimode optical signals and recombines the first and second optical signals onto first and second single mode outputs, respectively.

The application discloses a kind of metering equipment remote calibration method, device, medium and equipment.Therein, method includes: according to the current characteristic of extracted current signal in monitoring period, loss index is calculated, and the phase shift of each harmonic is determined based on loss index;According to the ambient temperature and the ambient humidity in environment management period, environment gain coefficient is constructed;According to the fundamental wave amplitude of current signal in monitoring period and environment gain coefficient, current correction coefficient is constructed;According to current correction coefficient, each harmonic amplitude in next monitoring period is corrected, and according to the phase shift of each harmonic, each harmonic phase in next monitoring period is corrected, and the calibration current of next monitoring period is obtained.

The application discloses a Watson-Watt direction-finder amplitude-phase calibration method and device, constructs a double-channel amplitude-phase coupling deviation reference spectrum through amplitude-phase deviation extraction and drift direction classification; establishes a channel deviation coupling relationship spectrum by jointly tracing the temperature drift and frequency dependence of each deviation factor, generates an overshoot risk mark by combining the compensation direction flip risk quantization; based on the channel deviation coupling relationship spectrum and the overshoot risk mark, carry out calibration residual convergence evaluation, determine the deviation level and identify the blocking factor set; according to the cross-frequency transfer path of the blocking factor set, complete the frequency range classification weight distribution, obtain the deviation value of each frequency range, and determine the deviation distribution type through polarity flip detection and asymmetry grading; finally, complete the cross-frequency range amplitude-phase linkage compensation amount solution and output the amplitude-phase calibration compensation parameters combined with the deviation level, realize the system identification and linkage compensation of the double-channel amplitude-phase deviation in the wide frequency range working scene.

The application provides a phased array antenna active standing wave test method and a test system, relates to the technical field of antenna testing, is applied to a control unit of a test system, and the test system further comprises a phase synchronization device, a multi-channel signal source, a switch network, a vector network analyzer and a directional coupling component connected in series in an excitation path. First, the phase synchronization device is controlled to synchronize each radio frequency channel to establish a phase reference, and then the switch network is switched to obtain channel basic parameters and component system errors, and calibration end face correction parameters for compensating amplitude and phase deviation are generated. Then, based on the parameters, each channel is controlled to synchronously output excitation signals to the phased array antenna to be tested, incident and reflected signals are collected, and active standing wave data is calculated according to the vector ratio. The application can ensure the simulation of real working conditions of full-array simultaneous excitation, unify the calibration end face to the antenna port to eliminate the fixed phase deviation of the link, correct the parameters once to realize repeated calibration-free at multiple frequency points and in multiple states, and significantly improve the test precision and efficiency.

This invention discloses a method and apparatus for transformer fault detection based on sound signals. The method includes: acquiring a target sound signal and a leakage flux signal of the transformer; determining the phase deviation between the target sound signal and the leakage flux signal based on the fundamental frequency of the target sound signal and the fundamental frequency of the leakage flux signal; determining the frequency coupling relationship between the leakage flux signal and the target sound signal; extracting the time-frequency features of the target sound signal; and determining the transformer fault detection result based on the phase deviation, frequency coupling relationship, and time-frequency features. This invention solves the technical problem of inaccurate fault detection in related technologies when using sound signals to detect transformer faults.