114results about "Error compensation/elimination" patented technology

The invention discloses an error compensation inductance sensor calibration method and system, and the method comprises the steps: controlling a macro-micro composite driving platform to drive a moving part provided with a to-be-calibrated inductance sensor, and enabling the moving part to carry out the continuous displacement movement relative to a fixed standard target surface; measuring the actual displacement of the moving part to obtain a standard displacement sequence; the actual output voltage of the inductive sensor to be calibrated in the movement process is synchronously collected, and an actual measurement value sequence is formed; solving measurement deviation, generating a measurement deviation sequence, and dividing the sequence into not less than three compensation intervals according to a displacement range; a compensation value lookup table is established in each compensation interval, and calibration parameters used for correcting zero offset, gain drift and nonlinear characteristics are generated. Displacement measurement and sensor output synchronous acquisition are combined, zero offset, gain drift and non-linear errors can be corrected in a targeted mode, and compensation fineness and adaptability are improved.

The invention provides a high-dynamic deformation measurement system and method based on laser section contour differential scanning. The measurement system is composed of a section contour measurement unit, a calibration unit, an error compensation unit and a data processing unit, wherein the section contour measurement unit comprises a multi-sight-line structured light sensor module, a speed sensing module and a distance measurement module; the calibration unit comprises a synchronous control module, an adjustment module and a common tooth-shaped calibration target; the error compensation unit comprises a vibration detection module, a posture detection module and a temperature detection module; the data processing unit is a device with programming and computing functions. The measuring method comprises the following steps: (1) calibrating a laser plane and an image plane; (2) unifying a global coordinate system; (3) obtaining point cloud data; (4) error compensation; (5) constructing a deformation time-history model; and (6) carrying out maximum deformation global optimization. According to the measurement system and method, accurate expression and maximum value global optimization of a pavement micro-deformation three-dimensional space under the load effect can be realized.

The invention relates to the technical field of mechanical state monitoring, and discloses a guide rail curvature online detection method and system, and the method comprises the steps: obtaining the multi-mode synchronous measurement data of a guide rail; carrying out preprocessing and space-time registration on the multi-modal synchronous measurement data; performing temperature compensation on the high-precision registration data; the curvature distribution of the guide rail fused with the displacement data is calculated, and mutation points are recognized through a curvature change rate threshold method for segmented modeling; calculating a multi-dimensional curvature parameter, and carrying out abnormal mode recognition by adopting a convolutional neural network; short-term early warning is carried out at the edge end, long-term evolution prediction is carried out at the cloud end, and predictive maintenance suggestions are obtained; according to the invention, transient bending deformation in a high-speed operation state can be captured, edge end data processing and early warning response delay are shortened, and real-time monitoring is truly realized.

The invention relates to a long-term monitoring and early warning method suitable for a large-span steel frame beam, and the method specifically comprises the steps: laying a distributed fiber grating sensor network at a key stress part of a target steel frame beam, and synchronously collecting an original deformation signal in real time; a temperature compensation algorithm and a wavelet noise reduction algorithm are used for preprocessing the collected various original deformation signals; identifying the deformation state of the key stress part through an improved conjugate beam method on the basis of the multiple original deformation signals after preprocessing and the structural model information of the target steel frame beam; constructing a steel frame beam deformation prediction model, and predicting the future deformation trend of the target steel frame beam by using the preprocessed historical and real-time signal time sequence data; and a steel frame beam abnormal deformation diagnosis model based on the graph neural network is constructed, abnormal recognition is performed on the deformation state of the key stress part based on a preset threshold value, and early warning is performed on the abnormal part in combination with the future deformation trend of the target steel frame beam.

The invention relates to the technical field of vision measurement, and discloses a three-dimensional vision measurement system based on multi-view structured light, and the system comprises a data collection module which obtains image data, system data and point cloud data through a sensor and a system; the synchronous link module is used for generating a synchronous pulse interval based on the system data; calculating a cross correlation coefficient to judge interference and finish construction of a synchronous link; the three-dimensional measurement module is used for adjusting and calibrating by utilizing a composite structure, adjusting brightness through double modulation, constructing a target section data representation model for iterative optimization, analyzing to obtain an absolute phase value, constructing an energy function, obtaining a matching point pair based on image data and calculating a depth error; the data architecture module is used for dividing point cloud data, carrying out gridding discretization on an integral region, carrying out parallel calculation on energy values, summarizing the energy values, and dynamically adjusting the order of multi-pole expansion; and the enhanced anti-interference module is used for carrying out anti-interference processing on the image data, adjusting measurement parameters and adjusting the projection light intensity based on the predicted light intensity.

Systems and methods for performing contactless wellhead displacement measurements in a desert environment include adjusting an alignment of optical components in an optical system based on a temperature of the optical system. A pattern of infrared light is projected from the optical system onto a portion of a wellhead, the infrared light having a wavelength away from water absorption wavelengths and solar maxima wavelengths. Reflections of the pattern of infrared light from the portion of the wellhead are captured using an imaging sensor of the optical system. A displacement of the wellhead is measured based on the projected pattern of infrared light and the reflections.

A coordinate measuring machine (measuring apparatus) includes: a probe (measurement performing unit) performing a measurement process on a measurement target; an electrical section disposed in a part of the probe; a temperature sensor provided for the electrical section and outputting a detection signal based on a temperature obtained by measurement; and a controller (measurement calculator) calculating a measurement result of the measurement target, in which the controller calculates the measurement result by compensating a measurement value obtained by the measurement process based on a processed signal obtained by applying a low-pass filter to the detection signal output from the temperature sensor.

A non-Cartesian coordinate positioning machine is provided, including a first platform and a second platform, and a plurality of extendable leg assemblies arranged between the first platform and the second platform for positioning the first platform and the second platform relative to each other. Each extendable leg assembly includes: (i) a first member and a second member that move relative to each other when the extendable leg assembly changes length, and (ii) a measuring member fixed to the first member for measuring the length associated with the extendable leg assembly; wherein the first member is at least partially formed of a composite material.

The invention relates to an assembly for position measurement. The assembly comprises a support (10), a scale (12) arranged on the support (10) and a plurality of fixing elements (16) for fixing the scale (12) at the support (10). The scale (12) extends in a longitudinal direction (X). The scale (12) has a measurement scale (14) for position measurement at least in the longitudinal direction (X). The support (10) has a plurality of individual sections (10.1-10.7). The fixing elements (16) are arranged on the individual sections (10.1-10.7) of the support (10).

This invention discloses an error-compensated inductive sensor calibration method and system, comprising: controlling a macro-micro composite drive platform to drive a moving component on which an inductive sensor to be calibrated is mounted, causing it to continuously move relative to a fixed standard target surface; measuring the actual displacement of the moving component to obtain a standard displacement sequence; synchronously acquiring the actual output voltage of the inductive sensor to be calibrated during the movement process to form an actual measurement value sequence; calculating the measurement deviation, generating a measurement deviation sequence, and dividing the sequence into at least three compensation intervals according to the displacement range; establishing a compensation value lookup table in each compensation interval to generate calibration parameters for correcting zero-point offset, gain drift, and nonlinear characteristics. This invention combines displacement measurement with synchronous acquisition of sensor output, enabling targeted correction of zero-point offset, gain drift, and nonlinear errors, thus improving the precision and adaptability of the compensation.

To provide a measuring device capable of executing appropriate correction processing corresponding to the actual temperature of a measurement execution unit.SOLUTION: A three-dimensional measuring instrument 1 (measuring device) comprises: a probe 10 (measurement execution unit) for executing measurement processing on a measurement object; an electrical unit 122 located in a section of the probe 10; a temperature sensor 124 provided to the electrical unit 122, for measuring a temperature and outputting a detection signal based on the temperature; and a controller 20 (measurement calculation unit) for calculating the measurement result of the measurement object. The controller 20 corrects the measurement value obtained by measurement processing and calculates a measurement result on the basis of a processing signal for which a low-pass filter is applied to the detection signal outputted from the temperature sensor 124.SELECTED DRAWING: Figure 1

A measuring system includes a measuring probe with a contact portion that contacts a workpiece to be measured. The measuring probe operates with a first update rate during at least part of a moving mode, wherein the moving mode includes movement of the measuring probe such that the contact portion is moved away from the workpiece and / or is moved at a distance from the workpiece that is equal to or greater than a threshold distance. The measuring probe operates with a second update rate (i.e., which is faster than the first update rate) during at least part of a measuring mode, wherein the measuring mode includes movement of the measuring probe such that the contact portion is moved toward the workpiece for obtaining a measurement. In various implementations, the combined use of the first and second update rates effectively reduces power-on drift of the measuring probe.

A portable coordinate measurement machine (CMM) includes an articulated arm including arm segments and rotary joints. At least one of the rotary joints includes a shaft configured to rotate about an axis of rotation of at least one of the rotary joints. The shaft includes a middle portion and first and second end portions fixedly attached to ends of the middle portion. At least one of the rotary joints includes first and second housing ends, the first housing end having an inner diameter that engages an outer diameter of the first bearing and the second housing end having an inner diameter that engages an outer diameter of the second bearing. The first and second bearings are preloaded to remove play.

The invention relates to the technical field of displacement measurement, and provides an F-P displacement sensor and a method for detecting displacement of an underground pipe gallery and a seam, and the F-P displacement sensor comprises two sections of single-mode optical fibers, a capillary tube, a sealing layer, a packaging film and an adhesive tape. The two sections of single-mode optical fibers are coaxially arranged, and the axes of the single-mode optical fibers coincide with the axis of the F-P displacement sensor; the axis of the capillary tube coincides with the axis of the F-P displacement sensor, the capillary tube surrounds the two sections of single-mode optical fibers in the circumferential direction of the F-P displacement sensor, and the two sections of single-mode optical fibers are longer than the capillary tube and extend outwards from the two ends of the capillary tube; the inner wall of the capillary tube is spaced from the outer wall of the single-mode fiber by a certain distance; the sealing layers are arranged at two ends of the capillary; the packaging film surrounds the capillary tube in the circumferential direction of the F-P displacement sensor. The packaging film is surrounded by the adhesive tape; and the single-mode optical fiber extends outwards from the two ends of the adhesive tape. According to the scheme, the micrometric displacement monitoring sensitivity and precision are improved, the long-term durability of the pipe gallery in a severe environment is improved, the production cost is reduced, and the yield is improved.

Coordinate measuring machine, with controlled machine axes (X, Y, Z, C) for performing measuring movements for component measurement, with at least one measuring device (4, 6) held by at least one of the machine axes (X, Y, Z, C) and movable by means of at least one of the machine axes (X, Y, Z, C), such as a tactile measuring device (4) or an optical measuring device (6), for acquiring uncompensated coordinate measurement values ​​(x1, y1, z1) on a component to be measured (8), with a device (10) for temperature compensation of the uncompensated coordinate measurement values ​​(x1, y1, z1) by means of a temperature model (12), wherein the temperature model (12) is configured to process one temperature measurement value (T1, T2) or several temperature measurement values ​​(T1, T2) as input variables, wherein the temperature model provides compensation parameters (dx, dy, dz) for the uncompensated has coordinate measurements and / or compensated coordinate measurements as output variables,where the temperature model (12) is adaptive and can be adjusted based on a database.

An advanced method for manufacturing an optoelectronic system array is disclosed in which micro-devices are developed separately and then transferred into a system substrate. Various embodiments are disclosed, including distributed sacrificial reference points, real-time monitoring with various sensing techniques, laser generated alignment marks, non-contact laser triangulation, and marking using polymers to dynamically estimate and correct alignment during each transfer phase. The invention further discloses a method for detecting and correcting errors caused by wear, environmental changes, load variability and mechanical vibrations, which may be AI-based. Generally, the system for pre-transfer calibration, monitoring, error detection, and compensatory adjustment enables precise and reliable integration of micro-devices into optoelectronic systems, thereby significantly enhancing alignment accuracy, stability, and reliability throughout the manufacturing process. The system may further be AI-based calibration verification in a micro device transfer system.

The invention provides a gravity angle sensor, a calibration method thereof and a gravity compensation method applying the gravity angle sensor, and belongs to the technical field of sensors and intelligent control. The sensor comprises a sensor frame, a flexible spring piece assembly, a mass block and a differential strain measurement unit, the flexible spring piece assembly is symmetrically connected with the mass block and the sensor frame, and the flexible spring piece assembly is configured to generate bending deformation perpendicular to the axial direction of the flexible spring piece assembly under the action of a gravity component; the differential strain measurement units are arranged on the convex side and the concave side when the flexible spring piece is bent and used for detecting the bending strain difference perpendicular to the axial direction. High-precision and real-time gravity compensation under a dynamic working condition is realized by calibrating a maximum strain difference value, measuring a current strain difference in real time, calculating a specific value and directly generating a gravity compensation amount without resolving an attitude angle and breaking through range limitation of a cosine function. According to the scheme, mechanical friction is eliminated, sensitivity and stability are improved, and the method is suitable for high-dynamic force control systems such as robots and precision platforms.

Apparatuses and methods for shape-memory alloy elements and sensing. An aircraft assembly comprising a sensor, a cable connected to the sensor, and a shape-memory alloy (SMA) element connected to the cable. The SMA element is configured to change shape and control tension in the cable. A method of using an aircraft assembly by changing the shape of the SMA element by an amount corresponding to a change in a length of the cable.

A three-dimensional (3D) scanner is in communication with a display includes one or more optical sensors. The scanner scans, using the one or more optical sensors, an object having a surface. The scanning generates data corresponding to a 3D shape of at least a portion of the surface of the object. The scanner generates a 3D reconstruction of the shape of the surface of the object. The scanner provides a preview of the 3D reconstruction of the at least portion of the shape of the surface of the object. The scanner provides, to the display, for rendering with the preview of the 3D reconstruction of the at least portion of the shape of the surface of the object, an indication of at least one of a quantity or a quality of the data corresponding to the 3D shape of the at least portion of the surface of the object.

This invention relates to temperature compensation for machine tools. The machine tool includes a base for positioning a workpiece thereon, at least one machining device for machining the workpiece, one or more actuators for moving the machining device relative to the base, and a control unit for controlling the actuators. The control unit includes a data storage unit for storing nominal data providing nominal dimensions of the workpiece at a predefined machining temperature, and at least one temperature sensor configured to determine one or more actual temperature values ​​of the workpiece. The at least one temperature sensor is configured to generate temperature data based on the determined actual temperature values ​​and provide the temperature data to the control unit. The control unit is configured to calculate the actual dimensions of the workpiece based on the nominal dimensions and the provided temperature data, and control the actuators to machine the workpiece according to the calculated actual dimensions. The machine tool includes one or more fixing devices for fixing the position and orientation of the workpiece on the base.

A computer device includes at least one processor in communication with at least one memory device. The at least one processor is programmed to: a) receive a plurality of images for a continuous scan phase shift interferometry (PSI), wherein the plurality of images includes a first plurality of pixels of a front surface of a sample and a second plurality of pixels of a back surface of a sample; b) simultaneously perform a first plurality of intensity scans of each pixel in the first plurality of pixels and a second plurality of intensity scans of each pixel in the second plurality of pixels; c) identify zero transitions for each of the first plurality of pixels; d) identify zero transitions for each of the second plurality of pixels; and e) compare the plurality of zero transitions to determine a relative movement and deformation of the sample during the PSI scan.

A computer device includes at least one processor in communication with at least one memory device. The at least one processor is programmed to: a) receive a plurality of images for a continuous scan phase shift interferometry (PSI), wherein the plurality of images includes a first plurality of pixels of a front surface of a sample and a second plurality of pixels of a back surface of a sample; b) simultaneously perform a first plurality of intensity scans of each pixel in the first plurality of pixels and a second plurality of intensity scans of each pixel in the second plurality of pixels; c) identify zero transitions for each of the first plurality of pixels; d) identify zero transitions for each of the second plurality of pixels; and e) compare the plurality of zero transitions to determine a relative movement and deformation of the sample during the PSI scan.

A coordinate positioning machine comprises a drive frame (37) and a metrology frame (36). The drive frame (37) comprises a drive arrangement (28) for moving a moveable structure (22) around a working volume (34) of the machine. The metrology frame (36) comprises a metrology arrangement (26) for measuring the position of the structure (22) within the working volume (34). In one aspect, the metrology arrangement (26) is a hexapod metrology arrangement and the drive arrangement (28) is a non-hexapod drive arrangement. The metrology frame (36) has a coefficient of thermal expansion that is lower than that of the drive frame (37). The drive frame (37) is coupled to the metrology frame (36) via a coupling arrangement (38) which prevents at least some distortion associated with any extra thermal expansion and contraction of the drive frame (37) from being transferred to the metrology frame (36). In another aspect, the drive arrangement (28) moves the structure (22) around the working volume (34) in fewer than six degrees of freedom, and the metrology arrangement (26) measures the position of the structure (22) within the working volume (34) in more degrees of freedom than the drive arrangement (28).

To provide an optical receiving unit for a position measuring system for determining spatial position information, the optical receiving unit certainly preventing faulty measurement even under mechanical and / or thermal stress.SOLUTION: The present invention relates to an optical receiving unit for a position measuring system for determining spatial position information. The receiving unit has a measuring cell. The measuring cell includes a base plate, a transparent cover plate with a scanning grating, one or more spacers between the base plate and the cover plate, and an optoelectronic detector whose light-sensitive surface is oriented in the direction of the cover plate. The detector is arranged on the base plate of the measuring cell via a self-centering compensating element.SELECTED DRAWING: Figure 2

The invention relates to a method for temperature management, in particular for thermal stabilisation, of a 3D measuring system which is designed to optically detect three-dimensional (3D) objects in the surroundings and to determine therefrom a digital three-dimensional image of the objects, wherein the 3D measuring system has one or more temperature sensors for detecting temperature values at one of the plurality of points of the 3D measuring system, characterised in that a temperature model of the 3D measuring system or at least individual system components of the 3D measuring system is provided, wherein the temperature model describes the thermal behaviour of the 3D measuring system or parts thereof, wherein on the basis of the temperature model and taking into consideration the temperature values measured by means of the temperature sensor or temperature sensors, temperature data at different points of the 3D measuring system are spatially and / or temporally predicted.

The invention relates to a method for temperature management, in particular for thermal stabilization, of a 3D measurement system, which is configured to optically detect three-dimensional (3D) objects in the environment and to determine a digital three-dimensional image of the objects from this, wherein the 3D measurement system has one or more temperature sensors for detecting temperature values ​​at one or more locations of the 3D measurement system, characterized in that a temperature model of the 3D measurement system or at least individual system components of the 3D measurement system is provided, wherein the temperature model describes the thermal behavior of the 3D measurement system or parts thereof, wherein, based on the temperature model and taking into account the temperature values ​​measured by means of the temperature sensor or temperature sensors, temperature data at various locations of the 3D measurement system are spatially and / or temporally predicted.

The invention relates to a thin-wall bearing radial dimension dynamic measurement system and method based on an annular laser array, and relates to the technical field of precision measurement, and the system comprises a device housing, one side of the device housing is provided with a sensor array, one side of the sensor array is provided with an annular support, one side of the annular support is provided with a rotating platform, and one side of the rotating platform is provided with an annular laser array. A bearing mounting clamp is arranged at the center of the rotating platform, a vibration isolator is arranged at the bottom of the rotating platform, a data acquisition module is arranged in the rotating platform, a constant-temperature liquid cooling circulating pump is arranged on one side of the data acquisition module, and a man-machine interaction terminal is arranged on one side of the device shell. The measuring method comprises the steps that S1, an instrument is initialized; s2, clamping and positioning the tested bearing; s3, dynamic measurement and phase compensation; s4, reconstructing a three-dimensional shape; and S5, precipitation of a measurement result, through the above design, the measurement precision and efficiency are improved, nondestructive measurement is realized, and the environmental adaptability is enhanced.

The invention relates to a measuring machine (20) with at least one translational or rotational machine axis for moving and / or positioning a workpiece holder (22) and a workpiece measuring unit (25) of the measuring machine (20) relative to each other. For this purpose, the at least one machine axis has a positioning body (40, 42, 44, 91) mounted on an associated guide in a translational or rotational degree of freedom (B1, B2), on which a sensor carrier (50) is mounted via a bearing arrangement (51). The bearing arrangement (51) is configured to provide a statically determinate mounting of the sensor carrier (50) on the positioning body (40, 91) and simultaneously ensure stress-free mounting. In this way, torsion or other deformation of the positioning body (40, 91), on which the sensor carrier is mounted, the workpiece holder (22), and the workpiece measuring unit (25) is prevented.

A coordinate measuring machine (CMM) for determining at least one spatial coordinate of a measurement point on an object, the CMM comprising a structure comprising a base and a plurality of frame elements, wherein a probe head is attached to one of the frame elements and movable relative to the base, wherein the CMM comprises a temperature control system configured to control a temperature of a plurality of frame elements of the structure and comprising a control unit, one or more temperature sensors, and one or more heating elements, wherein the control unit is configured to control the heating elements based on the temperature values received from the temperature sensors.

An opto-electronic dual-comb interferometric distance measuring method and device wherein a signal comb is chromatically divided into a target signal comb and a non-target signal comb at a emission position, preferably by an optical interleaver in a measurement probe of the device. Only the target signal comb serves as a free beam emitted to the target. The non-target signal comb serves for generation of additional or compensation internal phase differences. Thus, the distance to the target is based on first, target related phase differences and on the second, internal compensation phase differences.