7results about How to "Reduce calibration error" patented technology

The invention provides a laser measuring device for steel bar deformation, and belongs to the technical field of laser measuring equipment, the laser measuring device is characterized in that a top cover frame is arranged above a device base, and a detection cavity is formed between the device base and the top cover frame; the detection assembly comprises a grating light emitter and a grating light receiver which are used for detecting the deformation amount of the reinforcing steel bar, and the grating light emitter and the grating light receiver are both installed in the detection cavity and located on the two sides of the reinforcing steel bar; the driving assembly is used for fixing the bottom end of the reinforcing steel bar, driving the reinforcing steel bar to rotate along the axis of the reinforcing steel bar and driving the grating light emitter and the grating light receiver to move along the axis of the reinforcing steel bar for deformation detection, so that full-section detection of rotary scanning and axial movement is formed, and light signal changes instead of the relative offset between the two sections are captured section by section. The problem that a traditional laser measuring device is prone to data deviation is solved, a fixing assembly comprises two sets of clamping forks used for clamping the top end of a steel bar, and lubricating assemblies used for lubricating the rotating connecting position of a clamping roller and a support are arranged on the clamping forks.

The application discloses a kind of analog signal calibration method, controller and system suitable for semiconductor equipment, method includes: control analog signal output module exports first preset electric signal;Through analog signal input module, first preset electric signal is collected, and first electric parameter acquisition value is obtained;First preset electric signal is measured by analog electric parameter measuring device, and first electric parameter measurement value is obtained;According to first electric parameter acquisition value and first electric parameter measurement value, analog signal input module is calibrated;Control analog signal output module exports second preset electric signal corresponding to first preset electric parameter value;Second preset electric signal is collected by calibrated analog signal input module, and second electric parameter acquisition value is obtained;According to first preset electric parameter value and second electric parameter acquisition value, the signal output by analog signal output module is calibrated.By the above-mentioned mode, analog input signal and analog output signal can be calibrated to improve precision.

The present application relates to a flowered stereo calibration box and a camera calibration method based on an OCAM algorithm, wherein the flowered stereo calibration box comprises five checkerboards, each checkerboard is a regular row and column distributed black and white checkerboard, the bottom checkerboard is a square, the four side checkerboards are rectangles, the four side checkerboards are connected with one bottom side of the bottom checkerboard respectively, the four side checkerboards are equal to the included angle of the bottom checkerboard, and the four side checkerboards are divergent and inclined upward with the bottom checkerboard as the center; the checkerboard small grid of the bottom checkerboard is provided with a closed black frame, the black frame does not intersect with the checkerboard small grid; the three sides of the four side checkerboards which do not intersect with the bottom side of the bottom checkerboard are provided with black frames, the black frames are connected with the checkerboard small grid of the side checkerboard; and the bottom checkerboard is provided with four circular calibration points. The present application reduces the requirement for image quality, and improves the operation precision and operation efficiency of panoramic camera calibration.

The application provides a position calibration method and system of a mechanical arm and an electronic device. The first pose information set of a laser device in a first coordinate system when the laser device emits laser spots to a plurality of calibration points on a work plane is obtained. The first true value coordinate information set of the plurality of calibration points in a second coordinate system is obtained. The projection coordinate information set of the laser spots emitted by the laser device to the plurality of calibration points in the second coordinate system is calculated according to the first pose information set and an expected conversion relationship. The projection error is calculated according to the projection coordinate information set and the first true value coordinate information set. The expected conversion relationship is iteratively updated and the projection error is recalculated until the projection error converges. Then, the target conversion relationship from the first coordinate system to the second coordinate system is determined according to the expected conversion relationship corresponding to the projection error convergence. Thus, the non-contact calibration of the mechanical arm can be realized, and the calibration error of the mechanical arm can be reduced, and the calibration accuracy can be improved.

This invention relates to the field of gas analyzer calibration technology, specifically to a method for reducing calibration errors. The method includes collecting historical calibration data and current environmental parameters using a calibration error reduction device to construct a dataset. The calibration error reduction device includes an integrated probe, an environmental simulation section, and an analysis section. The integrated probe is entirely housed within the environmental simulation section. A machine learning model is trained using the dataset to obtain a parameter recommendation model that correlates parameters with calibration effectiveness. Based on the parameter recommendation model, calibration gas is input into the environmental simulation section, and the internal and external pressure values ​​of the environmental simulation section are measured. Based on these pressure values, automatic zero-point calibration, CO2 multi-parameter collaborative calibration across a range, H2O cross-validation range calibration, and operational verification are performed sequentially. This invention solves the technical problem of significant calibration errors caused by large differences in the operating environment between traditional calibration processes and actual measurement processes.

The embodiment of the invention provides a method for evaluating the blood vessel stenosis rate. The method is used for improving the accuracy of the calculated blood vessel stenosis rate. The method provided by the embodiment of the invention comprises the following steps: acquiring a vector blood flow velocity of a blood vessel stenosis area; acquiring a hemodynamic parameter calculated based on the vector blood flow velocity, and / or acquiring a first characteristic parameter of a blood vessel cross section acquired based on the ultrasonic image of the blood vessel stenosis region, the hemodynamic parameters comprise at least one of blood vessel wall surface shear stress, an oscillation shear index, relative residence time, blood flow dispersion, blood flow, a resistance index and a pulsation index, and the first characteristic parameters comprise at least one of a diameter parameter of a blood vessel cross section and an area parameter of the blood vessel cross section; and calculating the stenosis rate of the blood vessel stenosis area according to at least two of the vector blood flow velocity, the hemodynamic parameter and the first characteristic parameter.

This invention provides a Hall chip calibration structure, method, system, apparatus, and Hall chip, belonging to the field of chip technology. The Hall chip calibration structure includes: at least one calibration Hall disk, the shape of which is identical to the Hall disk used for functional implementation in the Hall chip to be calibrated; the calibration Hall disk is provided with an input terminal and an output terminal, the input terminal of which is connected to the output terminal of an external excitation, and the output terminal of which is used to output a Hall voltage. Compared with the prior art that uses circuits or modules for calibration, this significantly reduces calibration errors and improves the accuracy of calibration results.