93 results about "Pole figure" patented technology

The invention discloses a method for measuring an inverse pole figure by inclining and rotating a test sample. The method comprises the following steps of determining peak positions of diffraction peaks of the test sample and a standard sample and back bottom positions of the left side and the right side of the peaks; arranging the test sample and a detector at initial positions; obtaining the intensity and the back bottom intensity of all the diffraction peaks of the test sample under different inclination angles during rotation, calculating the net intensity of the diffraction peaks to obtain the net intensity of the diffraction peaks of the standard sample, calculating a ratio of the net intensity of the diffraction peaks of the test sample to the net intensity of the diffraction peaks of the standard sample under the different inclination angles, and calculating an average value of all the ratios to obtain an extreme density value of each diffraction peak; and marking the extreme density values of all the diffraction peaks on the inverse pole figure to finish a measurement process. During the measurement of the inverse pole figure, the test sample can be inclined and is rotated around 360 degrees by taking a normal of the test sample as a rotating shaft, so that all orientation crystal particles make contributions to the extreme density of the inverse pole figure. A measurement result and the material performance have a good corresponding relationship, and the scientificity is high.

A surface acoustic wave device has superior electrical power resistance that is obtained by improving stress migration resistance of electrodes. In order to form at least one electrode, for example, on a theta rotation Y-cut (theta=36° to 42°) LiTaO3 piezoelectric substrate, an underlying electrode layer including Ti or Cr as a primary component is formed, and an Al electrode layer including Al as a primary component is then formed on this underlying electrode layer. The Al electrode layer is an oriented film grown by epitaxial growth and is also a polycrystalline thin film having a twin structure in which a diffraction pattern observed in an X-ray diffraction pole figure has a plurality of symmetry centers.

The invention relates to a directional cutting method for preparing infrared nonlinear optical elements from a chalcopyrite uniaxial negative crystal, which comprises the following steps: (1) according to cleavage surfaces {112} and {101} of the chalcopyrite uniaxial negative crystal, utilizing a crystal standard pole figure with Wuwov's intersection ruler and an X-ray diffractometer to determine the direction of a C axis of the crystal through theta-2theta continuous scanning; (2) putting the crystal of which the direction of the C axis is determined on a cutting machine, rotating a sample stage for delta theta far away from the direction of the C axis according to a phase matching angle theta m required by an optical element, and cutting the crystal to obtain an original sample of the optical element, wherein the delta theta= theta m - theta (112); (3) putting the original sample of the optical element on the sample stage of the X-ray diffractometer, determining an oscillation photograph of a cutting surface of the original sample of the optical element, and obtaining a diffraction peak place value theta' and delta theta', wherein the delta theta'=absolute (theta'- theta'(112)); and (4) finishing the optical element, and correcting the cutting surface of the original sample of the optical element until the delta theta'=the delta theta.

The invention belongs to the technical field of signal processing, and provides a beam forming method and system of microphone voice signals of a hearing aid device, and the hearing aid device. The invention aims at solving the following problems: spatial orientation information picked up by a double-microphone voice signal beam forming method used on the existing hearing aid device is limited, the spatial resolution is relatively low, and the number of formed pole figures is small, such that when the directional noise is serious, the beams cannot be controlled conveniently and flexibly to form proper pole figures. According to the beam forming method and system provided by the invention, double miniature microphones are used, each miniature microphone comprises two sound pipes with opposite directions in the space to pick up voice signals, thereby improving the spatial resolution of voice pickup and the spatial orientation information of voice. More importantly, weight parameters and adjustable inclination angle parameters of signals are processed, so that the number of the pole figures corresponding to the final output voice signals is greatly increased, convenient and flexible control is realized, proper pole figures are formed, and the speech recognition rate of a user of the hearing aid device is improved.

The invention relates to a directional cutting method for preparing infrared nonlinear optical elements from a chalcopyrite uniaxial positive crystal, which comprises the following steps: (1) according to cleavage surfaces {112} and {101} of the chalcopyrite uniaxial positive crystal, utilizing a crystal standard pole figure with Wuwov's intersection ruler and an X-ray diffractometer to determine the direction of a C axis of the crystal through theta-2theta continuous scanning; (2) putting the crystal of which the direction of the C axis is determined on a cutting machine, rotating a sample stage for delta theta toward the direction of the C axis according to a phase matching angle theta m required by an optical element, and cutting the crystal to obtain an original sample of the optical element, wherein the delta theta= theta (101) - the theta m; (3) putting the original sample of the optical element on the sample stage of the X-ray diffractometer, determining an oscillation photograph of a cutting surface of the original sample of the optical element, and obtaining a diffraction peak place value theta' and delta theta', wherein the delta theta'=absolute (theta'- theta'(101)); and (4) finishing the optical element, and correcting the cutting surface of the original sample of the optical element until the delta theta'=the delta theta.

This invention provides a polycrystalline gallium-nitride self-supporting substrate comprising a plurality of gallium-nitride-based single-crystal grains aligned to a specific crystal orientation in a direction that is substantially parallel to the normal direction. The crystal orientations of said gallium-nitride-based single-crystal grains, as measured by subjecting the surface of the self-supporting substrate to electron backscatter diffraction (EBSD) and performing inverse-pole-figure mapping, form a variety of angles with the aforementioned specific crystal orientation, and the mean value of the distribution of said angles is between 1degrees and 10 degrees, inclusive. This light-emitting element comprises the abovementioned self-supporting substrate and a light-emitting functional layer that is formed on top of the substrate and contains one or more layers each comprising a plurality of semiconductor single-crystal grains each exhibiting a single-crystal structure that is substantially parallel to the normal direction. This invention makes it possible to provide a polycrystalline gallium-nitride self-supporting substrate with a reduced defect density in the surface thereof. A light-emitting element that uses said polycrystalline gallium-nitride self-supporting substrate and exhibits a high luminous efficacy can also be obtained.

Aluminous index of crystal face in face centered cubic structure includes nine different pole figures: {111}, {200}, {220}, {311}, {222}, {400}, {331}, {420} and {422}. 2-4 crystal faces selected from the said nine different pole figures are as pole figures to be tested. In 2D detection system of X ray measuring each data of pole figure is carrying out at same time under Chi angle Pi/6-Pi/3 and Phi angle Pi/2. Based on their tested data, it is guaranteed that calculated precision of orientation distribution function and inverse computed integrated pole figure are accordant between invented method and traditional algorithm. But, measuring time in the invented method is only 1%-2% of time needed by traditional algorithm. Thus, the invented method can realize measuring in real time under precision.

The invention provides a multi-sample combination method for detecting crystal orientation distribution. The method comprises the following steps: (1) selecting a plurality of samples at different parts of a steel plate; (2) processing the samples into a plurality of rectangular steel sheets in the same specification, stacking the rectangular steel sheets in a pole figure measurement sample rack and fastening, polishing and corroding the rectangular steel sheets to form R.D section samples; (3) measuring three imperfect pole figures (110), (200) and (211) of the R.D section samples; (4) computing an ODF (Orientation Distribution Function) figure by utilizing the conventional ODF software and acquiring Phi, Phi1, and Phi2 of a Bung coordinate system or Theta, Phi and Psi of a Roe coordinate system; and (5) utilizing the formulas (a) and (b) of the Bung coordinate system or the formulas (c) and (d) of the Roe coordinate system to compute the texture. The multi-sample combination method can reflect the crystal orientation condition of the samples in the whole thickness and has strong representativeness; for a laboratory with conventional ODF analysis software, specially planning or purchasing ODF software for computing the cross sections combined by dozens of samples is not needed, so that the use is convenient; and for a laboratory without the ODF analysis software, the only requirement is to plan or purchase the conventional ODF software, so that the cost is lower.

The invention relates to a method for measuring macroscopic texture of high-magnetic induction oriented electrical steel, which is applicable to detection of the high-magnetic induction oriented electrical steel with the average sample grain size of above 10mm. The method comprises the following steps: acquiring a synthetic sample and a contrast sample; measuring an incomplete pole figure of the synthetic sample and determining an orientation distribution function; obtaining the macroscopic texture of the high-magnetic induction oriented electrical steel. Through reasonable distribution of the samples and mathematical transformation, the representativeness of a result and the working efficiency can be significantly improved, so that the method can be widely applicable to the fields of production and research of the high-magnetic induction oriented electrical steel for an electrical transformer.