81 results about "Scale error" patented technology

An encoder calculates position error values and applies compensation values to encoder position measurements in-situ. The encoder includes a scale and a multi-section detector for detecting a spatially periodic pattern, such as an optical interference pattern, produced by the scale. The detector includes spatially separated first and second sections. A signal processor estimates respective phase values from detector sections and calculates a phase difference reflecting a spatial position error in the scale. A compensation value is calculated from the phase difference and included in the estimate of the scale position to compensate for this spatial position error. The compensation values may be calculated and used on the fly, or calculated and saved during an in-situ calibration operation and then utilized during normal operation to compensate uncorrected measurements.

The invention provides a method for calibrating an electronic belt scale. The method comprises the following steps of: making preparation for calibration, namely cleaning and adjusting the electronic belt scale, adjusting a pressure sensor and calibrating a tare value; on the condition that the electronic belt scale operates normally, obtaining the weighed value of a material of which the actual weight is known, and determining a scale error valve according to the actual weight and the weighed valve of the material; repeating the above measuring step so as to obtain multiple scale error values and determining an average scale error value according to the multiple scale error values; and determining a new weighed value correction factor according to the average scale error valve and an original weighed value correction factor and calibrating the electronic belt scale. The method is simple and has an obvious effect; and the calibrated electronic belt scale has high measurement accuracy and can be used for weighing large granular materials.

The invention relates to a continuous shearing method of a basic hole system section with fixed hole and fixed length, which is characterized in that length measurement is carried out by counting the number of basic hole system section fabrication holes, the relative position of the section and a cutting device is locked by inserting plug pins into the fabrication holes after the length measurement so as to realize the static synchronous following of the flying shearing process; the static synchronous following is adopted to replace the dynamic synchronous following in servo flying shearing, which improves the precision of scale flying shearing; and a screw rod adjusting device is adopted to adjust the spacing between the plug pins and a cutting die, which can adapt to batch products with different benchmark sizes. The method has the advantages of precise shearing, stability and reliability, convenient installation, simple and compact structure, convenient operation, and is economical and practical. The method leads the system to run reliably and have high synchronization precision and small scale error, is applicable to shearing the basic hole system sections of various specifications, and has wide generalization and application values.

A geometric error identification method of multi-axis machine tool includes a measuring step of indexing a position of a target ball mounted on one of a main spindle and a table into a plurality of angles around an rotation axis, and measuring the position of the target ball at respective indexed positions by using a touch probe mounted on the other one of the main spindle and the table, a geometric error calculation step of calculating a geometric error from the measured position of the target ball, an ellipse-expression calculation step of calculating an ellipse approximate expression by an arc trajectory measured by operating the rotation axis, and an error correcting step of calculating and correcting a scaling error of translation axes from the calculated ellipse approximate expression.

A method for registering patterns on a web to provide independent scale control in both the lateral and longitudinal directions is provided. The method comprises routing the web over a first roller; routing the web over a second roller and stabilizing the web; applying a pattern to the web using process hardware; measuring registration of the pattern and providing an error signal; controlling lateral position error using the error signal; controlling longitudinal position error using the error signal; controlling lateral scale error using the error signal; and controlling longitudinal scale error using the error signal. The method provides independent scale control in both the lateral and longitudinal directions. Independent scale control avoids non-linear distortions otherwise imposed by attempting to accomplish both corrections by stretching the web in both directions.

In accordance with one embodiment, a radar system with auto-alignment suitable for use in an automated vehicle is provided. The system includes a radar-sensor, a speed-sensor, and a controller. The radar-sensor is used to detect objects present in a field-of-view proximate to a host-vehicle on which the radar-sensor is mounted. The radar-sensor is operable to determine a measured-range-rate (dRm), a measured-azimuth-angle (Am), and a measured-elevation-angle (Em) to each of at least three objects present in the field-of-view. The speed-sensor is used to determine a measured-speed (Sm) of the host-vehicle. The controller is in communication with the radar-sensor and the speed-sensor. The controller is configured to simultaneously determine a speed-scaling-error (Bs) of the measured-speed, an azimuth-misalignment (Ba) of the radar-sensor, and an elevation-misalignment (Be) of the radar-sensor based on the measured-range-rate, the measured-azimuth-angle, and the measured-elevation-angle to each of the at least three objects, while the host-vehicle is moving.

An astatic multi-position high-accuracy calibrating method of inertia measurement unit can accurately calibrate out 33 error coefficients in 7 types such as gyroscope scale factor gyroscope erection error, accelerometer scale error, etc by making IMU rotate at six position with 12 times of rotation under condition that accurate rotary platform is not pointed at north.

The invention discloses a zero-velocity/course correction application online calibrating method for optical fiber strapdown inertial measuring unit, and belongs to the field of inertial technology. A carrier erection two-position aligning process is utilized sufficiently, main error sources including drift errors, scale errors, mounting errors and the like of the optical fiber inertial measuring unit are calibrated by a filtering method on the basis of zero-velocity correction and heading correction, and the actual use precision of the optical fiber inertial measuring unit is improved. Output data of an optical fiber gyro and output data of a quartz accelerometer are acquired by determining parameters of the initial position of a carrier; the gesture of the carrier is determined by means of coarse alignment; and online calibration is realized by precise alignment for a horizontal position and a vertical position. The method is used for calibrating main error items of the optical fiber inertial measuring unit, so that the parameter identification precision of a system and an actual navigation performance of the optical fiber strapdown inertial measuring unit are improved.

The method in the invention includes: a. arranges the image and the mark around the image on the platform of the scanner through precise orthogonal grid and precise linear grid, and defines the scanner line CCD direction is X direction, step motor is Y direction; b. carries on whole scan to the image and the mark through precise orthogonal grid and precise linear grid; c. marks and amends one or more sub-items error to the scanned image, the sub-items are X-X error, X-Y error, Y-Y error, Y-X error, lines proportion error, row proportion error, vertical and horizontal proportion error, scanning error and high frequency vibration error.

A system and method is provided for identifying scale, scale error, or improper positioning during construction or reconstruction of a multi-dimensional (e.g., 3D) building model using known architectural dimensions. The system identifies architectural elements that have known architectural standard dimensions. Dimensional measurements (or dimensional ratios) of architectural elements in the multi-dimensional model (poorly scaled) are compared with known architectural standard dimensions, with or without scale error, to properly scale, rescale or position one or more planes within the multi-dimensional building model.

The invention provides a method and device for verifying a high-accuracy direct-current comparator for resistance measurement. The method comprises the following steps: firstly connecting two or more than two same nominal resistors in serial and in parallel so as to respectively form serial resistor arrays and parallel resistor arrays; connecting the parallel resistor arrays with nodes at the two ends of all parallel resistors by virtue of a four-end lead node structure, and setting short-circuit compensation for externally-connected short-circuit sheets when the resistor arrays are connected in parallel; then carrying out proportion measurement by virtue of measured direct-current comparators, and obtaining serial-parallel proportion readings by the direct-current comparators; connecting three groups or more than three groups of nominal resistors in series and in parallel, and then carrying out the proportion measurement by virtue of the measured direct-current comparators; and comparing with the specified accuracy level according to the production of the serial-parallel proportion readings of all the groups of serial and parallel resistor arrays, so as to realize the proportion verification of the direct-current comparators. By utilizing the method provided by the invention, accurate verification of proportional errors of the high-accuracy (the accuracy reaches 10-7-10-8 levels) direct-current comparator used for resistance measurement can be realized.

A new method is provided for the creation of a dummy pattern. A typical wafer exposure mask contains a Clear Out Window (CLWD) pattern, this CLWD pattern is of no value during the process of shielding the area on the surface of the wafer where the alignment mark must be placed. This CLWD can therefore be used to create a dummy overlay pattern, resulting in a reduction in the wafer scaling error that typically occurs as a result of metal deposition. For the same reasons, a dummy overlay pattern can also be created in the scribe lines of the wafer surface.

An image forming apparatus includes: Photoreceptors; an image carrier; a plurality of light emitting element arrays each configured to emit a light beam to a corresponding one of the photoreceptors independently; an angle adjustment unit to adjust a mounting angle of the light emitting element arrays to a frame of the image forming apparatus; a pattern forming unit to form a positional error correction pattern of each color on the image carrier; a optical detector to detect the correction pattern formed on the image carrier; a positional error calculation unit to calculate a printing skew error and a main scanning scaling error of the light emitting element arrays based on the correction pattern detected by the optical detector; a skew correction unit to correct the printing skew error detected by the positional error calculation unit; and further a main scanning scaling error correction unit.

The pill counter of the present invention, counts pills by measuring the weight of individual or a small number of pills as they gradually drop onto a weight scale. During the time between each pill drop, the count is obtained by comparing the weight of latest pills dropped to the expected weight ranges of one or more pills. The expected weight range includes pill weight variation and weight scale error. When the measured weight is between two expected ranges, there is at least one broken pill in addition to the whole pill count of the lower expected range. The counter adds the count of each pill drop to obtain the total count of the pills. In different approach, whenever there is a change in the reading of weight scale more than the error of the weight scale or a predetermined value, the count of pills is increased by one.

Provided is a current measuring device such that it is possible to reliably keep the fluctuation range for the ratio error in output to within a range of ±0.5% and such that assembly thereof can be simplified. The current measuring device is configured to include at least a light entrance and exit, an optical fiber for a sensor, a Faraday rotator, a first 1/4 wavelength plate, a second 1/4 wavelength plate, a polarization separator, a light source, and a signal processing circuit comprising a photoelectric conversion element. The optical fiber for a sensor has birefringence and comprises one end into which two circularly polarized light beams having different directions of rotation enter and another end that reflects the circularly polarized light beams that have entered. In addition, the phase difference of two linearly polarized light beams in the round-trip light path between the two 1/4 wavelength plates is compensated, and the Faraday rotational angle when the Faraday rotator is magnetically saturated is set to 22.5°+α° so that the fluctuation range for the ratio error in the measured value of the current to be measured is set to be in the range of ±0.5%. In addition, the crystal axes on the optical faces of the two 1/4 wavelength plates are set to be perpendicular or are set to be in the same direction.

The invention discloses a steel band tape scale error measuring method, which comprises the steps of: step 1, arranging and fixing a verified tape and a standard tape on a verification platform horizontally; step 2, adopting a camera for photographing at a measuring point to obtain a steel band tape image; step 3, processing the steel band tape image to obtain a distance-to-pixel ratio of the standard tape; step 4, acquiring a standard tape target scale position W1 and a verified tape target scale position W2; step 5, and calculating scale error of the verified tape by utilizing the acquired standard tape target scale position W1, the verified tape target scale position W2 and the distance-to-pixel ratio, and judging whether scale error of the measuring point of the verified tape meets the requirement. The steel band tape scale error measuring method is simple in process, convenient to implement and low in cost, measures steel band tape scale error based on machine vision, realizes automatic measurement of steel band tape scale error, can increase measurement accuracy, and can improve the detection efficiency.

The invention relates to an error compensation separation electric connector, which consists of a separation socket, a separation plug, a rotation pin, a supporting and pulling mechanism, a cable, a tail sleeve, a tail accessory, an adapter plug, and an adapter socket; the separation socket is connected with the adapter plug through the cable; the tail of the adapter plug is connected with the tail accessory; and the supporting and pulling mechanism is installed on the tail accessory through the tail sleeve and connected with the separation plug through the rotation pin to rotate with the rotation pin as a rotating shaft. A vertical separation connector capable of realizing tri-direction large-scale error compensation can lower installation accuracy of the equipment, and has supporting and pulling functions so as to keep the connector in a plugged state; reliable electrical connection is provided; after being started, momentary enforcing separation of the connector can be accomplished.

A system for determining (a) forecast error and/or (b) scaling error for wind power generation is provided, the system utilizing generated and forecast time series for power generation derived from wind and analyzing temporal correlations in the wind fluctuations to quantify: (a) the forecast error defined by deviations between the high frequency components of the forecast and generated time series, and (b) a scaling error defined by a degree that temporal correlations fail to be predicted for an accurate predictor of wind fluctuations. Wind fluctuations may exhibit multi-fractal behavior at the turbine level and/or may be rectified to a fractal structure at the grid level. A memory kernel may be used to reduce the forecast and scaling errors.

The invention relates to an error compensation method of active powers and reactive powers, belonging to the technical field of alternating circuit (AC) parameter measurement. The error compensation method comprises the following steps: performing average computation on sampled active powers and sampled reactive powers to obtain average active power and average reactive power; and performing offset error compensation, proportional error compensation and angle error compensation on the average active power and the average reactive power to obtain final active power output and final reactive power output. An active power offset error setting value, a reactive offset error setting value, a proportional error adjustment coefficient and an angle error adjustment coefficient are obtained by direct correction computation, so that each correction parameter can be computed and set accurately, offset errors caused by common-mode noises are compensated, and the compensation accuracy is high.

The invention provides a field calibration method and system for a composite measuring device. The method comprises the following steps: performing electric standing on the composite measuring devicefor the first preset duration, acquiring static output of a triaxial MEMS (Micro-electromechanical Systems) gyroscope, and determining a zero drift estimated value of the triaxial MEMS gyroscope, wherein the zero drift estimated value is the mean of static output of the triaxial MEMS gyroscope in the second preset duration; respectively rotating the composite measuring device on an axis X, an axisY and an axis Z for preset angles, and acquiring output after the triaxial MEMS gyroscope compensates the zero drift estimated value; and by taking uniaxial FOG output as a reference value, performing Kalman filtering estimation on the triaxial gyroscope scale error according to the output after the triaxial MEMS gyroscope compensates the zero drift estimated value, thereby obtaining the triaxialMEMS gyroscope scale error estimated value. According to the method and system disclosed by the invention, field calibration of the composite measuring device is realized.