85 results about "Phase resolution" patented technology

The present invention integrates the surface plasmon resonance and common-path phase-shift interferometry techniques to develop a microscope for measuring the two-dimensional spatial phase variation caused by biomolecular interactions on a sensing chip without the need for additional labeling. The common-path phase-shift interferometry technique has the advantage of long-term stability, even when subjected to external disturbances. Hence, the developed microscope meets the requirements of the real-time kinetic studies involved in biomolecular interaction analysis. The surface plasmon resonance microscope of the present invention using common-path phase-shift interferometry demonstrates a detection limit of 2×10⁻⁷ refractive index change, a long-term phase stability of 2.5×10⁻⁴π rms over four hours, and a spatial phase resolution of 10⁻³ π with a lateral resolution of 100 μm.

A reference image of a pattern having a first pitch and projected on a sample 1 by a projector 6 is captured by a camera 5. Next, a measuring image of a pattern having a second pitch and projected on the sample 1 by the projector 6 is captured by the camera 5. Here, the second pitch of the pattern light is determined by a value calculated based on the phase resolution of the pattern light having the first pitch. Then, using the reference image thus obtained, phase coupling for the measuring image is performed. The three-dimensional shape of the sample is obtained in this manner.

Disclosed are a code book creation method and device and an initial code book creation method, for a wireless communications system. The code book creation method includes: a step in which the amplitude or power for channel status information for channels between a plurality of transmission antennas and a reception antenna is obtained; and a step in which elements of a codeword for an initial code book are dynamically mapped to the plurality of transmission antennas and a first code book is generated, on the basis of the amplitude or the power. The initial code book creation method includes: a step in which prescribed elements of the codeword are set to have a prescribed phase resolution; and a step in which the other elements of the codeword are set so as to be arranged in order of gradually increasing or gradually decreasing phase resolution. The order of arrangement between elements having the same phase resolution is arbitrary and the phase resolution is the number of phases possible for all elements in the same position for all codewords in the initial code book. As a result, the accuracy of the code book and the performance of the system are improved.

A low jitter, high phase resolution phase lock loop incorporating a ring oscillator-type VCO is designed and constructed to operate at a characteristic frequency M times higher than a required output clock frequency. Multi-phase output signals are taken from the VCO and selected through a Gray code MUX, prior to being divided down to the output clock frequency by a divide-by-M frequency divider circuit. Operating the VCO at frequencies in excess of the output clock frequency, allows jitter to be averaged across a timing cycle M and further allows a reduction in the number of output phase taps, by a scale factor M, without reducing the phase resolution or granularity of the output signal.

The invention discloses an alternating current-direct current space charge measuring system capable of improving a pulsed electro-acoustic (PEA) method, comprising a pulse generator, an emitter-coupled logic integrated programming support environment (Eclipse) signal averaging controller, a high-voltage pulse generator, a PEA measuring unit, a signal generator and a processing host. The system disclosed by the invention adopts the pulse generator of 3kHz and an Eclipse high-speed data acquisition system to acquire real-time signals, so that the measuring time is obviously shortened, a good phase resolution ratio can be obtained under high-frequency voltage and low-frequency voltage and real-time measurement of space charge under the influence of alternating current-direct current voltage can be realized; and meantime, a space charge attenuation graph can more vividly reflect dynamic change of charge.

The invention discloses an OCT (optical coherence tomography)-based high-sensitivity measurement system and method with a large dynamic range of flow speed. According to the measurement system and method disclosed by the invention, a two-dimensional scanning strategy combining fast scanning driven by saw-tooth waves and slow-speed scanning driven by step waves is adopted, and a high-speed CMOS (complementary metal oxide semiconductor) camera is utilized for acquiring an interference spectrum. A traditional phase resolution algorithm is adopted in the fast scanning direction for extracting high-flow-speed information, and a high-order correlation phase resolution algorithm is adopted in the slow-speed scanning direction for extracting slow-flow-speed information and a phase variance value corresponding to the large dynamic rate of the flow speed. A flow speed image is synthesized from the high-flow-speed information and the slow-flow-speed information. After space filtering and binarization are performed on a phase variance image, a mask image is obtained, and the flow speed image is processed by the mask image to get the final flow speed image. According to the measurement system and method disclosed by the invention, the dynamic range of measurement flow speed can be expanded, and the noise-limited speed detection sensitivity is further broken through.

The invention relates to a phase difference synchronous measuring device and a phase difference synchronous measuring method for multi-way sine wave signals, and belongs to the technical field of electronic measurement. The device comprises two or more than two signal conditioning circuits, two or more than two analog-to-digital conversion circuits, two or more than two data registers, a sharing logic control circuit, an interface circuit, a computer, a man-machine interface circuit and a clock circuit, and a measured object is phase difference of two or more than two ways of sine wave signals, wherein the number of the signal conditioning circuits, the number of the analog-to-digital conversion circuits and the number of the data registers are the same, and the signal conditioning circuits, the analog-to-digital conversion circuits and the data registers are matched in a one-to-one mode. Due to the adoption of the device and the method, the phase difference of the multi-way sine wave signals can be measured synchronously, the phase resolution is high, a waveform is stable, the multi-way phase synchronism is high, and error influence factors such as sampling clock jitter, channel synchronization error, the stability of channel phase delay, amplitude noise and the like in the conventional phase measuring method are prevented.

A receiver includes an I-Q demodulator (135) responsive to the I and Q components carried on a first frequency signal line (132). A demodulator frequency generator (275) generates a demodulating signal to extract the carried I and Q components. A phase adjustment circuit (105) makes the demodulating signal substantially in phase with the first frequency signal. A transition detector (445) generates a state transition signal in response to a change of state of at least one of the I and Q signals. A peak detector (460) generates a peak detected signal in response to occurrence of a peak amplitude of at least one of the I and Q signals. A clock generator (470) adjusts the phase of a symbol clock signal used to decode the I and Q components in response to the state transition signal and peak detected signal.

A received signal is sampled at a sampling period of T+m*(T/n) during a sampling phase determination process. T is a symbol or chip period of the received signal, n is a number of phases of the sampled signal, T/n is a phase resolution period, and m is a fixed non-zero integer value where −n<m<n (e.g. m=1 or −1). By sampling the received signal at the sampling period of T+m*(T/n), a sample set for each one of n phases of the sampled signal is produced. For each sample set, a correlation process is performed between the sample set and a predetermined correlation signal to produce a correlation result. Once an optimal correlation result is identified from the correlation process, the received signal is sampled at a sampling period of T at a phase associated with the optimal correlation result. Advantageously, oversampling at a sampling rate of n/T is not required during the sampling phase determination process, which reduces cost and power consumption.

The invention discloses an interferometer with an adjustable dynamic range, which comprises a light source, an illumination system, a beam expansion collimation system, a light splitting system, an imaging system, a PZT precision tiltboard, a Fizeau flat plate, a standard lens, a tested optical element, a mounting and clamping regulation system and a computer control and data processing system. Phase shift related to a spatial position occurs to inclination between tested light and reference light beams among CCD pixels, an angle of inclination of the Fizeau flat plate arranged on the PZT precision tiltboard is controlled by a computer so as to control the spatial frequency of generated carrier frequency interferograms, and various algorithms, such as a Fourier transform-based algorithm, a spatial phase-shift algorithm and the like, are adopted to perform phase resolution. For the carrier frequency interferograms of different kinds of spatial frequency, the algorithms suitable for frequency characteristics of the spatial frequency of the carrier frequency interferograms are adopted to perform optimal phase shift resolution, so that a phase extraction algorithm works in an optimal range to further realize high-precision phase resolution. The interferometer of the invention has the adjustable dynamic range, relatively larger dynamic range, relatively higher measurement precision and relatively greater application value.

The invention discloses a measurement method and a system of flow velocity vector of a three-dimensional flow field of a microfluidic chip. The spectral domain optical coherence tomography technology (SD-OCT) is combined with the Doppler Effect, and a narrow-band phase plate is applied on the basis. The spectral domain OCT realizes the extraction of deep information of the flow field of the microfluidic chip through the parallel detection of Interference spectrum; compared with the conventional time-domain OCT, the imaging speed is greatly improved. The Doppler frequency shift and the Doppler broadening are comprehensively utilized, the narrow-band phase plate is inserted between a collimating mirror and a focusing lens of an imaging probe, thereby implementing the spatial encoding of the Doppler information, realizing the imaging requirements on the spatial high-resolution three-dimensional speed vector, combining with the Doppler OCT method which is based on the phase resolution technology to meet the high-speed and high-sensitivity measurement requirements and finally realizing the speed vector imaging with high-resolution, high-speed, high-sensitivity and large-imaging range of the three-dimensional flow field of the microfluidic chip.

The invention relates to a method for detecting geometric resolution of a space camera, a method for detecting time phase resolution of the space camera, and a mobile detection vehicle for detecting geometric and time phase resolution of the space camera. The conventional ground fixed target form is changed, and a geometric resolution target is combined with the mobile vehicle to form a mobile target, so that geometric resolution detection and mobile calibration function of different time phases are realized, and the test precision of the geometric resolution of the optical camera in a random direction is improved. The conventional ground fixed target can be stored in a cabin, can be quickly arranged in emergency and can also play a role in complementing a hard target of a vehicle body and a conventional soft target. The invention can be widely applied in the fields of detection and calibration of aerospace optical cameras and imaging systems.

A digital frequency modulator is disclosed. In the digital frequency modulator, a first gain controller multiplies an input digital signal by a first gain determined according to a required modulation frequency, a phase accumulator accumulates the input digital signal and generates a phase accumulation according to a required phase resolution to output the phase accumulation within a predetermined output range. A second gain controller multiplies the output of the phase accumulator by a second gain determined according to the required modulation frequency and the first gain. A phase modulator outputs cosine and sine values having a phase corresponding to the second-gain controlled signal.

A phase shift apparatus, system and method are described herein for synchronizing output signals upon one or more components of a synchronous system. In one embodiment, the phase shift apparatus may be implemented as a clock generation circuit, which is configured to provide synchronous clocking signals to one or more components of the synchronous system. In another embodiment, the phase shift apparatus may be implemented as a data interface circuit, which is configured to provide error-free data transmission within a synchronous system. In either embodiment, the phase shift apparatus is configured to shift the plurality of signals by programmable first phase shift amounts prior to shifting the plurality of signals by programmable second phase shift amounts. As such, the phase shift apparatus is adapted to substantially eliminate clock skew, data skew and/or jitter, which may otherwise adversely affect the synchronous system. In addition, the phase shift apparatus is adapted to provide a phase resolution, which allows accurate control of such timing delays at substantially any operating frequency.

Image resizing through resampling by poly-phase filtering with a phase generation from input parameters but with lower resolution of the phase for filter selection. Field and frame mode selection creates initial offsets for alignment. A phase accumulator generates sample addressing with its most significant bits, generates filter selection with its middle bits, and maintains its least significant bits for accuracy.

The invention provides a phase-locking amplifier, which comprises a signal conditioning unit, a phase demodulation unit and a digital-analog sampling unit, wherein the signal conditioning unit performs phase reversion, filtering and pressure partition on an input signal to be detected; the phase demodulation unit multiplies signals output by the signal conditioning unit and a reference signal phase-shifting unit; and the digital-analog sampling unit performs digital-analog conversion on the signal output by the phase demodulation unit to obtain a digital signal and feeds the digital signal back to the reference signal phase-shifting unit. The phase-locking amplifier also comprises the reference signal phase-shifting unit which is used for adjusting the phase of an input reference signal according to the digital signal fed back by the digital-analog sampling unit. Compared with the prior phase-locking amplifier, the phase-locking amplifier provided by the invention is provided with the reference signal phase-shifting unit to count the input reference signals simultaneously according to different phase clocks, thus the phase resolution is multiplied.

The invention discloses an insulation fault diagnosis method for high-voltage equipment. The method comprises the steps of (1) acquiring a polluted training sample for representing partial discharge signals of a plurality of insulation fault types of the high-voltage equipment, extracting phase resolution pulse sequence data based on the polluted training sample, and normalizing the phase resolution pulse sequence data; (2) training a constructed deep sparse denoising autoencoder through the normalized phase resolution pulse sequence data; and (3) inputting the polluted partial discharge signals of the to-be-identified high-voltage equipment into the trained deep sparse denoising autoencoder, and obtaining the defect type of the high-voltage equipment based on output of an output classification layer of the deep sparse denoising autoencoder. In addition, the invention further discloses an insulation fault diagnosis system for the high-voltage equipment. The system comprises a data preprocessing module and a fault identification module.

The invention discloses a frequency-varying signal two-dimensional direction finding method using the rotation of two sensors. The frequency-varying signal two-dimensional direction finding method using the rotation of two sensors solves the following technical problems in the prior art: the phase of a solution is fuzzy; the iterative calculation is time-consuming; the convergence is time-consuming; the frequency-varying signal cannot be processed; and the signal-to-noise ratios of different signals are not considered. The frequency-varying signal two-dimensional direction finding method usingthe rotation of two sensors disclosed by the invention adopts a simple hardware architecture, uses amplitude and phase information collected by the two sensors and a receiver, and adopts steps 1 to 5, so that a two-dimension incidence angle of the frequency-varying signal is obtained efficiently and accurately for the frequency-varying signal in a rotation period; no fuzzy phase resolution is existed in the process, the iterative calculation is time-saving, and the convergence is time-saving. The sensor in the invention is an antenna or a microphone, that is, the algorithm provided by the invention is not only suitable for obtaining the incoming wave direction of an electromagnetic wave by using the antenna, but the idea can also be extended to applications such as using rotation of two antennas or microphones to obtain the incoming wave direction of a sound wave.

The phase locked loop (PLL) of the invention comprises a first divider (DIV1), a second divider (DIV2), a phase detection means (PFD) and an oscillator means (VCO) connected in a PLL loop configuration. The first divider (DIV1) and the second divider (DIV2) each have at least two different selectable frequency factors (a, b; c, d). A control means (CTPL) switches between pairs of frequency division factors selected respectively from both dividers (DIV1, DIV2) according to a predetermined switching pattern (Z). The usage of at least two different pairs of frequency division factors in the dividers (DIV1, DIV2) allows a high phase resolution, a fast tracking speed and a fine adjustment of the frequency/phase of the output signal of the voltage-controlled oscillator (VCO) in steps of ppm.

The invention provides a Phi-OTDR quantitative measurement method based on integral least square fitting, and relates to the technical field of optical fiber sensing. In a phase optical time domain reflectometer based on a digital coherent detection mode, optical phases for measuring dynamic events on the optical fiber are continuously accumulated in the length direction of the optical fiber, dueto the nonuniformity of refractive index distribution of the optical fiber, the accumulated phases have the characteristic of random distribution in the length direction of the optical fiber, and thefrequency drift of laser also affects a measurement result. In order to obtain accurate quantitative demodulation results, through a series of data acquisition and processing processes such as data acquisition, coordinate regulation, position judgment, original phase resolution, new origin setting, phase subtraction and mean value removal, a relatively smooth phase change value is obtained in thelength direction of the optical fiber, and in order to further achieve accurate solution, a solution result is obtained after the processes of data fitting and applicable judgment. According to the method, the influence of laser frequency drift is reduced as much as possible, and meanwhile, the influence of noise such as polarization fading is reduced, so that the measurement result has high reliability and accuracy.