10 results about "Non linearity" patented technology

The invention discloses a magnetic tunnel junction and a TMR sensor, and belongs to the technical field of magnetic sensing. The magnetic tunnel junction comprises a substrate layer, a ferromagnetic free layer, a barrier layer, a ferromagnetic reference layer and an antiferromagnetic pinning layer, wherein the ferromagnetic free layer, the barrier layer, the ferromagnetic reference layer and the antiferromagnetic pinning layer are sequentially stacked on one side of the substrate layer; wherein the crystal face of the ferromagnetic free layer is a (110) crystal face. According to the embodiment of the invention, the linearity of the magnetic field sensing of the magnetic tunnel junction can be improved, the nonlinear error is reduced, and the TMR sensor can obtain a wider high-linearity measurement range.

This invention relates to the field of earthwork trenching technology, specifically to a method and system for excavating slope trenches for prefabricated quick-assembly grid beams. In this invention, by collecting high-density discrete coordinates of the slope and constructing a reference straight-line vector connecting the beginning and end, the geometric correction depth of each surface point relative to the ideal flat bottom surface is calculated. This eliminates nonlinear errors caused by the original slope undulations, ensuring that the bottom surface of the trench accurately adapts to the straight-line configuration of the prefabricated components. The resistance gradient change characteristics during the excavation process are combined with a clustering algorithm to dynamically lock the interface between soft and hard geological layers. The excavation depth required by the geometric design is fused and compared with the measured depth of the geotechnical boundary in the same coordinate system. Based on the comparison results, differentiated cutting or stripping commands are intelligently generated. When encountering hard rock layers higher than the designed bottom surface, a fuzzy PID algorithm is activated to enhance hydraulic driving force and ensure cutting efficiency. In soft soil operating areas, standard pressure is maintained to reduce energy consumption.

A Gaussian transfer function is applied to a profile of a feature on an image of a workpiece generated using an electron beam metrology tool. This generates an output profile. Non-linearity of the output profile is determined. Two threshold values can be selected and plotted on an XY plane. Proximity of a slope of the threshold values to a comparison value is determined.

The invention discloses a tail water taking elevation identification method. The method comprises the following steps: obtaining dam front water level data, reservoir vertical water temperature distribution observation data and tail water temperature data; cleaning the water temperature distribution observation data, and removing observation points higher than the water level in front of the dam and invalid data; dividing the cleaned water temperature distribution observation data into a plurality of layers; respectively solving elevation fitting functions of the multiple layers and sections, and splicing the elevation fitting functions to form an elevation high-precision fitting function of the continuous temperature; according to the elevation high-precision fitting function, constructing an inversion objective function, and calculating the water taking elevation of the tail water under the dam; according to the method, the thermal stratification structure is distinguished, the continuous high-precision temperature elevation function is constructed, the error objective function is constructed in combination with the temperature of the tail water, then the water taking elevation is inverted through the numerical optimization method, nonlinear characteristics such as a thermal spring layer are effectively captured, and the accuracy of water taking elevation inversion is remarkably improved.

A Gaussian transfer function is applied to a profile of a feature on an image of a workpiece generated using an electron beam metrology tool. This generates an output profile. Non-linearity of the output profile is determined. Two threshold values can be selected and plotted on an XY plane. Proximity of a slope of the threshold values to a comparison value is determined.

The invention relates to the technical field of geometric quantity precision measurement, and discloses a four-layer half-hole plate precision drilling and cutting track measurement system, which comprises an image acquisition module, a deformation analysis unit and a track measurement module, and is characterized in that the image acquisition module acquires a random texture image of the surface of a to-be-drilled site and a dynamic projection contour of a cutting tool; the deformation analysis unit identifies a feature point displacement vector and is used for reconstructing a non-uniform grid and converting the deformation of the base material into a local coordinate offset of a corrected reference surface; and the trajectory metering module extracts gray gradient data to determine a main shaft deflection vector, and identifies a depth zero position in combination with a shadow shortening rate, and by using an inversion mechanism of base material local texture displacement and rotating light and shadow characteristics, the non-linear residual caused by press fit stress release is eliminated, and the spatial consistency of complex inner layer space motion trajectory metering is ensured.

The invention discloses a saddle opening lineation solution, a tool is manufactured according to the combination of the principle that an approximation method approaches to a circle and the principle of a projection method, the tool comprises a positioning groove and a probe, a shape can be accurately drawn on a nonlinear plane, and the innovation is that the concept that the approximation method approaches to the circle is adopted, a line segment is used for replacing the drawing of the circle, and the drawing accuracy is high. The approximation method combines an approximation circle and a projection method, the approximation method makes up the limitation that the projection method can only draw a line on a preceding plane, and a standard shape contour can be drawn on a non-linear plane. The multipurpose saddle opening marking tool is characterized in that a tool is manufactured according to the combination of the principle that an approximation method approaches a circle and the principle of a projection method, the tool comprises a positioning groove and a probe, and a shape is accurately marked on a nonlinear plane.

The present application belongs to the technical field of radiation measurement, and particularly relates to a neutron gamma pulse fast matching method and system. The method comprises: obtaining a digital pulse sequence; determining a parabolic virtual baseline according to the weighted sum of the pulse baseline noise and peak amplitude, and solving the intersection point of the first-order differential signal of the pulse and the baseline as the weighted zero-crossing time feature; calculating the ratio of the first moments of the waveform areas before and after the peak point as the asymmetric torque feature; constructing a basic transition probability matrix using historical samples, and generating an instantaneous transition probability matrix according to the nonlinear disturbance of the asymmetric torque feature of the current pulse; combining the two features to form a two-dimensional vector, calculating the weighted Mahalanobis distance based on the instantaneous transition probability matrix, and completing the matching according to the principle of close distance. The present application solves the problems of noise sensitivity, fixed matching criteria, insufficient precision and stability of the existing pulse discrimination technology.

This application relates to a code density calibration method and system based on dark counting. The method includes: setting a SPAD in Geiger mode under no-light conditions; generating a Poisson-distributed dark counting pulse unrelated to the TDC clock using thermal perturbation; using this pulse as a trigger signal to acquire and convert raw code during non-measurement periods / independent channels; recording the frequency of each unit using a counter array; calculating the total number of samples and the system period; calculating the calibration results of each unit, as well as differential and integral nonlinear indices; calculating the correction time value based on the indices; storing the calibration time in on-chip storage using the raw code as an index; constructing a calibration lookup table; during actual detection, using the raw code to address and look up the table, reading the calibration time and combining it with the coarse count to synthesize a high-precision result. This method can improve the measurement accuracy, stability, and environmental adaptability of a high-precision time-to-digital converter.