31 results about "Half-integer" patented technology

Provided are a device for measuring fractional-order optical vortex topology charge values and a measuring method thereof. The measuring method comprises the steps of writing generated calculating holographic images into a spatial light modulator through a computer holographic technique, acquiring wrapped phase images of vortex light beams through Michelson interference light paths and a four-step phase shifting technique, analyzing distribution of real phases theta of the vortex light beams through a phase image unwrapping algorithm, and calculating according to the topology charge definition of m=theta/2pi to obtain topology charge values m of any fractional-order accuracy. The device and method achieve the measurement of any step (0.1 step) of topology charge values of the fractional-order vortex light beams, can correct measurement of topology charge values of vortex light beams from existing half-integer step (0.5 step) to any step and can be widely applied to measurement of topology charge values in the fields of bose-einstein condensation, quantum communication, information coding and transmission, particle confinement, optical tweezers, optical wrenches and the like.

A interferometer type polarization beam combiner and splitter, which can combine or split polarized light over a wide band, is provided. The interferometer type polarization beam combiner and splitter includes: an optical splitter; an optical coupler; an optical path length difference imparting unit, which includes a plurality of optical waveguides arranged between the optical splitting unit and the optical coupling unit; one or two input/output ports connected to the optical splitter; and two input/output ports connected to the optical coupler. A half-integer of a wavelength of λc is set as a normalized phase difference, for the optical path length difference imparting unit, between two polarization states, and means for generating a difference in refractive index dispersion is provided between the optical waveguides of the optical path length difference imparting unit, so that the change rate of the transmittance with respect to wavelength is suppressed for the two polarization states.

The invention discloses a backlight module, and belongs to the technical field of liquid crystal display. The backlight module comprises LED light sources and an angle selection sheet, wherein the angle selection sheet is located on the light-out side of the LED light sources; the angle selection sheet comprises multiple diaphragms which are arranged in a stacked mode; the thicknesses and the refractive indexes of the diaphragms are designed according to the relationships of the optical path difference and the wavelengths of the light sources, wherein the optical path difference of light at afirst angle is a half-integer multiple of the wavelength of the corresponding light source, and the optical path difference of light at a second angle is an integer multiple of the wavelength of the corresponding light source; in the light emitted by the backlight sources, the light at the first angle is diverged outwards through the angle selection sheet, and the light at the second angle is reflected and then passes through the angle selection sheet again until the light is at the first angle. According to the backlight module, by designing the angle selection sheet, the light emitted by thebacklight sources is transferred into small-angle backlight at the preset angle, and the small-angle backlight can completely enter corresponding quantum dot units, so that the light-out collimationdegree is improved, and crosstalk among pixels of a quantum-dot liquid crystal panel is prevented.

An apparatus and method for producing a multi-pulse sequence for irradiating a substance provided with quadrupole nuclei with either integer or half-integer spins to detect an NQR signal emitted therefrom. The apparatus has pulse sequence generating means adapted to produce multi-pulse sequences with pulse intervals exceeding T₂* and containing a preparatory pulse or group of pulses for creating echo signals between the pulses. The pulse sequence is organised so that the resulting signal contains a prevailing echo component produced by the preparatory pulse or group of pulses.

The invention discloses a method for detecting and correcting a clock error lock of a CPM signal greater than 1 modulation index. When the modulation index of the CPM signal is a half integer greaterthan 1, a signal has a plurality of positive slope zero-crossing points in half of code element time through an S curve of the delay locking ring; mistaken locking of the delay locking ring is caused.An error detection decision device is introduced to detect whether the tracking ring is locked mistakenly. When error lock occurs, the output of an error accumulator in the error detection decision device can exceed a set threshold. A judgment is made that the delay locked loop has error locking. The delay to a correct locking interval is pushed through an error detector and the value of an erroraccumulator is reset to be 0 under the condition of setting an appropriate threshold value, an appropriate weighting coefficient and an appropriate propelling interval, and the tracking loop enters acorrect tracking process. Through verification on a Matlab platform, under the condition of different modulation indexes, the error detection decision device can correctly judge the false lock and enable the delay locking ring to enter a correct locking interval again.

An object of the invention is to provide a concentrated winding brushless motor of a permanent magnet type, in which a lead wire and a jumper wire to a tooth far away from the adjacent tooth are disposed at the ends of coils on an axially reverse side in order to make a manufacturing work of coils efficient. In order to achieve the object, there is provided a brushless motor which is provided with a concentrated winding stator and a permanent magnet type rotor, a stator coil is wound to satisfy that the number of times of winding of coils of a tooth connected to the lead wire is set to a half integer or, in a case where there is a coil which is connected to the coil of the tooth connected to the lead wire, the number of times of winding of the teeth is set to a half integer, the number of times of winding of the coil of the tooth connected to the lead wire or a coil of a tooth far away from the adjacent tooth which are connected by the jumper wire, or the number of times of winding of the coil of the tooth adjacently connected to the coil of the tooth far away from the adjacent tooth which are connected by the jumper wire is set to an integer.

The invention belongs to the technical field of frequency dividers of integrated circuits, and particularly provides an integer and half-integer frequency divider based on characteristic state feedback. The frequency divider comprises a clock phase inverter, an N-bit binary counter, an output clock selector and a feedback controller; and the feedback controller comprises a level type characteristic state decoder, a triggering type characteristic state decoder, a level type inverter and a triggering type inverter. According to the frequency divider, by feeding back characteristic states determined by a frequency division coefficient and conducting phase processing on an input clock, the binary counter is triggered at the edge designated by a to-be-divided clock, and the counting bit corresponding to the frequency division coefficient is selected and output to serve as a frequency division clock; and only an interface signal of the binary counter needs to be processed, the internal structure of the binary counter does not need to be changed, the advantages of being simple in design and high in universality are achieved, and not only can complete integer and semi-integer frequency division be achieved, but also the duty ratio of the frequency division clock can be adjusted by taking a 0.5 input clock cycle as the precision.

The invention provides an X-ray source scanning parameter adjustment method. The method comprises the steps that X-ray source scanning parameters are obtained, wherein the X-ray source scanning parameters comprise a rotation period of a target disk and an energy period of an X-ray source; the ratio of the rotation period to the energy period is determined; if the ratio does not satisfy a preset condition, the X-ray source scanning parameters are adjusted, so that the ratio satisfies the preset condition; the preset condition is a first preset condition or a second preset condition, wherein thefirst preset condition is that the ratio of the rotation period to the energy period is not equal to an integer, and the second preset condition is that the ratio of the rotation period to the energyperiod is equal to a half integer. The provided X-ray source scanning parameter adjustment method has the advantages that by adjusting the rotation period of an anode target disk and the energy cycleof the X-ray source, the rotation period of the anode target disk is not an integral multiple of the energy period of the X-ray source, thereby avoiding the occurrence of an 'anode target disk energybeat frequency phenomenon', reducing the thermal deformation of the anode target disk, and prolonging the service life of the anode target disk.

The invention relates to an active sensor based on a half-integer order resonance mode, comprising: a base plate, a first dielectric plate, a microstrip line excitation layer, a second dielectric plate, a resonator and a metal tube; the base plate is applied to the first One surface of a dielectric plate; the microstrip line excitation layer is applied to the other surface of the first dielectric plate; a surface of the second dielectric plate is in contact with the microstrip line excitation layer; the resonance A body is disposed on the other surface of the second dielectric plate. Among them, a second dielectric plate and a resonator are used to form a resonator to generate a half-integer-order resonant signal, and an amplifier chip is introduced into the resonator, which can amplify the half-integer-order resonant mode signal under passive conditions. In order to make up for the detection loss existing in the detection process, while improving the resonance strength and the quality factor of the sensor, the detection accuracy of the sensor is further improved.

The present invention concerns the enhancement of critical current densities in cuprate superconductors. Such enhancement of critical current densities include using wave function symmetry and restricting movement of Abrikosov (A) vortices, Josephson (J) vortices, or Abrikosov-Josephson (A-J) vortices by using the half integer vortices associated with d-wave symmetry present in the grain boundary.

In the capturing process of a CPM signal with a modulation index h being more than 1 and being a half integer, due to the fact that a correlation function of the CPM signal has the multi-peak characteristic, the problem of false capturing can happen, and the spread spectrum CPM signal is captured by applying a Bump Jump algorithm to correlation function peak detection of the spread spectrum CPM signal with the modulation index larger than 1. A secondary peak detection method of the spread spectrum CPM signal based on collision jump is provided aiming at the influence of the low signal-to-noise ratio on zero point dislocation of main detection and auxiliary detection functions, when a receiver detects a secondary peak, judgment and processing are carried out, an estimated code phase jumps towards the direction of a main peak, and finally the position of the main peak is determined. Verification is carried out on a Matlab platform, a detection algorithm based on collision jump is suitable for capture of spread spectrum CPM signals, the detection performance of the algorithm is improved by about 4 dB compared with that of a Bump Jump algorithm under the condition of a low signal-to-noise ratio, and capture of the spread spectrum CPM signals under the condition of the low signal-to-noise ratio can be more effectively achieved.

In order to prevent accumulation of rounding errors caused by the integer-based bilinear interpolation used in the motion compensation process of image coding and decoding methods, two types of P frames are used for unidirectional motion compensation prediction, namely: P+ frames, which round the results of bilinear interpolation with real number operations to the nearest integer and rounds half integer values (0.5 added to an integer) away from zero, and P- frames, which differs from P+ frames in that the above mentioned half integer values are rounded towards zero. Utilising both of these P+ and P- frames enables cancelling of rounding errors and prevents the accumulation of rounding errors.

Acquisition method for a localization receiver, in particular for a GPS receiver. It involves the calculation of an interpolated FFT spectrum (S′) of correlated signals in which the frequency lines corresponding to half-integer values of the frequency resolution defined by the FFT are obtained by a combination of both amplitude and phase values of the FFT spectrum (S).