84results about How to "Correct measurement error" patented technology

An embodiment of the invention provides a method for calibrating a phase center of a receiver antenna and an apparatus thereof. The method comprises the following steps: measuring and obtaining far field phase directional diagram data of a receiver antenna and taking the far field phase directional diagram data as input test data; establishing mathematical models of Phrase Center Offset (PCO) andPhase Center Variation (PCV) of the receiver antenna by utilizing the input test data; exporting PCO and PCV value calculation models of the antenna by utilizing a least square method, and carrying out numerical solution on the PCO and PCV value calculation models by utilizing a linear equation group solution or polynomial fitting regression analysis method to obtain PCO and PCV values of the antenna. According to the embodiment of the invention, absolute positioning (phase) of PCO and PCV of the receiver antenna can be obtained, and a measurement error brought by antenna phase center change can be accurately corrected to raise measurement precision of a GNSS (Global Navigation Satellite System) receiver.

The invention relates to a method for determining at least one unknown laser beam parameter of a laser beam used for correcting errors of a transparent material including inducing a first persistent modification in the material by an interaction with the laser beam having a first set of laser beam parameters, measuring the induced first persistent modification of the material, calculating a second persistent modification in the material using a model describing persistent modifications in the material with a second set of laser beam parameters, wherein the first set of laser beam parameters comprises the second set of laser beam parameters and the at least one unknown laser beam parameter, setting up a target functional including the first persistent modification and the second persistent modification, and determining the at least one unknown laser beam parameter by minimizing the target functional.

Coordinate transformation parameters are adopted at the time of synthetically combining partial measurement data so as to eliminate the setting error that can get in when a workpiece is set in position on a measuring machine. Then, a shape parameter is adopted to estimate the approximate error shape of the entire workpiece and the approximate error shape is removed from the measurement data. As a result, the residuals are reduced if the measurement data are those of three-dimensional sequences of points. Differences are small when small residuals are compared so that the mismatch is reduced. According to the present invention, the entire measurement data can be synthetically combined without using the conventional concept of overlap.

In a shape measuring apparatus having a scanning probe to perform scanning measurement using a tip ball provided at an end of a stylus with the tip ball being in contact with an object to be measured, a tip ball displacement detector detects a displacement of the tip ball of the scanning probe, a displacement of a moving mechanism that relatively moves the object to be measured and the scanning probe is detected, and an angle formed by a contact direction of the tip ball with the object to be measured and an axial direction of the stylus is calculated. The displacement of the tip ball that is detected by the tip ball displacement detector is corrected on the basis of the angle, and a corrected value of the displacement is outputted. The corrected value is added to the displacement of the moving mechanism to calculate a measurement value.

The method and equipment is in use for system of its neutral point not connected to ground under well of coal mine. Using centralized control mode, the method centralizes zero sequence current (ZSC) of each branch switch to a device. The device controls each branch switch and main switch. Comparing with prior art, the invention eliminates not unitive criteria for electric leakage of each branch switch and main switch; eliminates unwanted operation factors from influence of change of system voltage and system capacitance on corresponsive zero sequence voltage (ZSV) of leakage resistance. Integrated applying three types of algorithm including method of abrupt change quantity of ZSC, phase method of ZSC and ZSV, and relative phase comparison method of ZSC, the invention selects one of the algorithms automatically based on relative merits and physical circumstances of system. When leakage occurred at multiple branches, the invention trips off the branch with largest leakage current.

The invention discloses a capacitance measuring sensor device in an absolute position, which comprises a capacitive grating sensor, a measurement signal processor, a data processor and a display, wherein the capacitive grating sensor comprises a one-grade or multi-grade calibration sensor and a measurement sensor and a memory electronic element is used for memorizing a phase value and a phase difference of the calibration sensor and the measurement sensor so as to determine a counting zero of the measurement; the calibration sensor has absolute measurement function in an effective working range and the pitch score of the measurement sensor is larger than or equal to the pitch score of the calibration sensor. As for measurement in an absolute circumferential position, the capacitive grating sensor is a round capacitive grating sensor comprising a one-grade or multi-grade calibration sensor and the measurement sensor; as for measurement in an absolute angle (arc) position, the capacitive grating sensor comprises a one-grade round grating calibration sensor and a flexible hinge grating measurement sensor; as for measurement in an absolute linear position, the capacitive grating sensor comprises a one-grade or multi-grade calibration sensor and a linear measurement sensor.

A dynamic variable compression ring for use in submersible pumps. where the variable compression ring compensates for metal compression ring measurement errors during assembly. The dynamic variable compression ring also allows for thermal heating of the internal pump components, thus maintaining the desired diffuser compression values.

The invention relates to a force bearing point position calibration method for a weighing sensor of multi-point mass center measurement equipment. The method comprises the steps of building a measurement reference coordinate system of the mass center measurement equipment by coordinate measurement equipment; respectively arranging standard pieces at a plurality of positions, measuring mass centerpositions of the standard pieces respectively by the coordinate measurement equipment when the standard pieces are arranged at different positions, and recording an output value of each weighing sensor when the standard pieces are arranged at different positions; building a static moment balance equation comprising force bearing point coordinate of each weighing sensor; and solving the static moment balance equation to obtain the force bearing point coordinate of each weighing sensor of the mass center measurement equipment. By the method, a measurement error caused by deviation of the force bearing point of the weighing sensor relative to an actual-measurement position before unloading during product loading of the mass center measurement equipment can be corrected, and the measurement accuracy of the multi-point mass center measurement equipment is remarkably improved.

The invention, which relates to the technical field of ammonia gas detection, discloses a continuous measuring device for the ammonia gas releasing amount in concrete, thereby solving a problem of theexisting device cannot continuously absorb and measure ammonia gas in concrete. The device comprises a data acquisition system, an experimental box, an ammonia gas absorption device, an air supply system, a temperature control system and an automatic ammonia concentration detection system. The data acquisition system is a host computer; and the two ends of the data acquisition system are respectively connected with the temperature control system and an automatic ammonia gas concentration detection system. In addition, the invention also discloses a continuous measuring method for the ammoniagas releasing amount in concrete. According to the invention, the vibration and hardening process of concrete is simulated by regulating the environmental conditions of the temperature and wind speedin the experiment box, thereby realizing real-time detection of the ammonia gas releasing amount in the whole process of concrete pouring and maintenance and thus filling the blank of the ammonia gasreleasing amount detection method in the concrete pouring process.

To provide a technique capable of highly accurately measure the intensity and the spectrum of fluorescence and scattered light by effectively correcting measurement error that occurs due to variation of flow positions of fine particles in a channel. A data correction method for a fine particle measurement device is provided, which includes an intensity detection procedure capable of detecting light generated from a fine particle by emitting light onto the fine particle flowing through a channel, and obtaining intensity information about the light, a position detection procedure capable of obtaining position information about the fine particle, and a correction procedure for correcting the intensity information on the basis of the position information.

In an interference measuring device, which includes: a coherent beam generating source; a sample to be measured; a lens system for forming an image of the sample to be measured on an observing plane; an interference element for splitting a coherent beam into two systems, and forming an interference image on the observing plane or a plane equivalent thereto; an image pickup element for picking up the interference image on the observing plane; and a calculating device having functions of capturing and storing the interference image converted to electric signals by the image pickup element, and determining the phase distribution changed by the sample to be measured from the interference image by calculation, wherein a means for removing the phase change distribution due to the interference element is provided.

A measurement error attributable to intake air pulsation of a heating resistor type air flow rate measuring device is corrected. A measurement error correction method not dependent on an intake system of a vehicle is provided. An output from a sensing circuit is sampled at prescribed time intervals. Output values thus sampled are successively converted to flow rate values. A first flow rate value is determined by averaging the flow rate values thus obtained in a prescribed amount of time. Separately, the output from the sensing circuit is averaged for a prescribed amount of time. The average output value thus obtained is converted to a second flow rate value. A correction value for correcting a measurement error is determined based on a difference between the first and second flow rate values.

A passive sound telemetry system and method is provided, in which phase differences are calculated for every pulse from acoustic signals received via three or six acoustic receivers, to measure a distance and angle with respect to a sound source. The system is applied to an operating toy giving chase to a user while following the user command. The telemetry system includes first to fourth acoustic receivers (111–114) contained in the housing for receiving first to fourth acoustic signals from a user, first to fourth zero crossing detectors for generating first to fourth pulse signals based on the first to fourth acoustic signals, earliest reception signal detector for detecting a pulse signal having the earliest phase among the first to fourth pulse signals, first to fourth arrival time difference calculator (70) for calculating arrival time differences between the pulse signal of the earliest phase and the first to fourth pulse signals, respectively, thereby obtaining an angle and a distance between the center of acoustic receivers and the user, based on a time difference between the second and third minimum arrival time difference values.

The invention discloses a short-distance ultrasonic wave distance measuring system based on a single chip microcomputer. The short-distance ultrasonic wave distance measuring system mainly comprises an ultrasonic wave sensing module US-100 with the temperature compensating function, the single chip microcomputer C8051F340, a digital display tube and a buzzer. According to the short-distance ultrasonic wave distance measuring system, the distance can be automatically measured in a real-time mode, the short-distance ultrasonic wave distance measuring system is particularly suitable for an automobile reversing radar, and therefore accidents which possibly occur in automobile reversing are avoided. Specifications of electronic devices included in the short-distance ultrasonic wave distance measuring system based on the single chip microcomputer are all of a universal type, and therefore the short-distance ultrasonic wave distance measuring system based on the single chip microcomputer has the advantages of being easy in purchase, simple in process, low in production cost and the like. Within the range of 4.5m, the measuring precision is improved to 0.3cm, and the short-distance ultrasonic wave distance measuring system has the good effect in various distance measuring applications.

The invention discloses a blind hole method residual stress automatic drilling testing device. The device comprises a drilling system, a clamping system, a positioning system and an automatic testing system; the drilling system can be used for drilling any plane of a test sample piece; the clamping system is used for clamping in a pushing and pressing manner, so that the clamping stress can be reduced to the greatest extent, and the measurement error is reduced; the positioning system can automatically identify the position of a strain gauge and calculate the coordinates of a drilling position; and the automatic testing system performs automatic tool setting and automatic drilling according to the position of the strain gauge identified by an image, and after drilling is finished, software calculates the residual stress of different depths and surface layers of the sample piece according to a strain value after feeding each time and the actual drilling hole diameter measured by the image identification.

A device for determining a magnetic field distribution of a magnet along a main surface of said magnet, the device comprising: an arrangement of at least two independent magnetic field camera modules being arranged in a fixed relative position with respect to each other, each magnetic field camera module being adapted for measuring a magnetic field distribution to which it is exposed by means of a respective detection surface; a means for providing a predetermined relative movement between the main surface and the arrangement to thereby scan the magnetic field distribution of the magnet along the main surface; and associated method.

The invention provides a method for improving the measurement result accuracy of a laser particle counter. The laser particle counter comprises a plurality of laser transmitters. The method comprises the following steps: when the performance degradation of a main laser transmitter causes a calibration coefficient to distort, enabling a standby laser transmitter to work to carry out secondary calibration on the calibration coefficient of the main laser transmitter; and after the performance of the main laser transmitter degrades to a certain degree, using the standby laser transmitter, and starting the standby laser transmitter to serve as a new main laser transmitter. The method has the beneficial effects that a measurement error of the laser particle counter due to the performance degradation of the laser transmitter in a use process is corrected so as to improve the measurement result of the laser particle counter, and meanwhile, the service life of the laser particle counter is prolonged.

The embodiment of the invention discloses a blood pressure measurement method and device. The blood pressure measurement device acquires sensor signals of a first detecting point and a second detecting point which are selected by a user and positioned on one artery blood vessel of the user and at different distances from the heart; when receiving a first measurement instruction, the first blood pressure measurement device determines a first height difference which is the height different of the first detecting point and the second detecting point on a first conduction pathway on which first pulse waves pass by the first detecting point and the second detecting point, and the height difference between the first detecting point and the heart of the user is a fixed preset height difference; the blood pressure measurement device determines a target blood pressure measured value corresponding to the first height difference according to preset first rules.

The invention belongs to the field of sensors, and discloses a method for correcting the deviation of a coordinate axis of an inertial sensor. The method is mainly used for eliminating a sampling error caused by the deviation of the coordinate axis due to the wrong placement position of the inertial sensor which is placed on an objected to be measured. The method is simple, convenient and fast to use; the method does not need other devices, thus being low in cost; the method can be used for carrying out high-precision correction on the deviation of the coordinate axis of the inertial sensor.

The invention provides a quantitative line scanning method for a curved sample based on an electronic probe. The method comprises the following steps of searching a sample analysis region through a backscattered electron image; setting the acceleration voltage of an electronic microscope, the size of electronic beams, the size of electronic beam spots, the minimum moving step length of a surface distribution diagram and a grid data lattice; reading the coordinate position of a current point, moving a subsequent point, and reading the coordinates of the moved point until the coordinate positions of all grid points are completely read; performing element characteristic X-ray spectrum analysis to obtain an element strength surface scanning diagram of an analysis region; testing the X-ray strength of a standard sample of an analyzed element, and converting the X-ray strength in an original counting surface scanning result into concentration content to obtain a quantitative surface distribution diagram; performing line scanning to obtain a quantitative line scanning curve of the curved sample. By the adoption of the method, a measurement error caused by unevenness of the surface of the sample can be corrected, the detection efficiency and the detection accuracy are improved, the problem that the electronic probe can be used for analyzing a flat sample only is effectively solved, and the range of samples, which can be analyzed by the electronic probe, is expanded.