394 results about "Laser interferometry" patented technology

The invention discloses a noise reduction method and system for a high-performance TWS Bluetooth audio chip, and relates to the technical field of acoustoelectric integration, and the method comprises the steps: collecting an environment noise signal, synchronously obtaining a Bluetooth radio frequency interference signal, converting the Bluetooth radio frequency interference signal into a digital signal through a 24-bit analog-to-digital converter, and outputting a multi-modal noise feature matrix; performing noise separation and reverse sound wave generation on the multi-modal noise characteristic matrix by using a pre-trained lightweight CycleGAN model, and outputting a reverse sound wave signal; monitoring auditory meatus tightness parameters in real time, dynamically adjusting phase offset and frequency response balance parameters of the mixed noise reduction signals, and outputting optimized noise reduction signals adaptive to the current wearing state; and performing parameter calibration on the optimized noise reduction signal through anechoic chamber scene simulation and laser interferometer phase detection to generate a noise reduction control instruction set. According to the invention, the noise interference problem of the TWS earphone in a complex environment is effectively solved.

The invention relates to the technical field of optical detection, in particular to an aspheric lens laser interference detection adjustment error separation system and method, and the method comprises the steps: placing an aspheric lens on a clamping platform, carrying out the multiple laser interference measurement through adjusting different pitch angles and azimuth angles, and collecting a multi-angle interference fringe image; for different installation and adjustment error types, key features of typical error fringe images are extracted and compared with current interference fringe images, and identification of the installation and adjustment error types and levels is achieved; a mathematical model of various installation and adjustment errors is constructed, polynomial parameterization representation is adopted, installation and adjustment compensation parameters are reversely solved according to an identification result, and installation and adjustment are completed; and repeating the measurement and analysis process, and constructing an error adjustment frequency optimization model until the precision requirement is met. The method provided by the invention can improve the adjustment efficiency and precision of the aspherical lens.

The invention discloses a rapid positioning and punching device and method for a precision die, and relates to the technical field of precision die and die casting machining equipment. The device comprises a workbench and an air floatation-vibration suppression and vacuum pre-fixing integrated platform at the bottom of a positioning groove of the workbench, and the air floatation-vibration suppression and vacuum pre-fixing integrated platform can be switched between a vacuum adsorption pre-fixing mode and an air floatation vibration suppression mode. Y-axis modules are arranged on the two sides of the workbench and drive the X-axis module and the Z-axis lifting mechanism to move. The intelligent drilling unit adopts an inner cooling type drill bit with a built-in phase change microcapsule, and the position error is compensated in real time through a laser interferometer. The method integrates the devices and sequentially comprises the steps of workpiece vacuum pre-fixing, air floatation vibration suppression, self-adaptive balanced clamping, vision and laser composite positioning, drilling and phase change self-cooling, laser dynamic error compensation and the like. The problems of positioning drifting, short service life of a drill bit and clamping unbalance during drilling of high-hardness die steel and large die castings (such as electric control boxes of new energy automobiles) are effectively solved.

The invention relates to a data acquisition and analysis system and method for laser interference measurement, and aims to solve the problem of limited measurement precision caused by asynchronous signal acquisition, imperfect environmental interference compensation and algorithm errors of the existing system. The system comprises a photoelectric conversion unit, a signal conditioning unit, a high-speed synchronous acquisition unit, a real-time processing unit and an error compensation module. The photoelectric conversion unit adopts a four-quadrant PIN photodiode array to receive interference light signals and convert the interference light signals into analog electric signals; the signal conditioning unit performs gain adjustment and bandwidth limitation on the signal; the high-speed synchronous acquisition unit realizes femtosecond-level synchronous acquisition of signals; the real-time processing unit performs phase solution and eliminates harmonic errors based on an improved arc tangent algorithm; and the error compensation module fuses temperature sensor data and accelerometer data to realize thermal drift and vibration compensation.

The invention discloses a surface defect height quantitative detection method and device based on all-optical laser ultrasound. The method comprises the following steps: respectively exciting and detecting ultrasonic Rayleigh waves in a state that a pulse laser and a laser interferometer are arranged on the same side and different sides of a surface defect of a detected sample piece, extracting the transit time of an incident Rayleigh wave and the transit time of a transmission Rayleigh wave, and obtaining the height of the surface defect on the basis of the transit time of the incident Rayleigh wave and the transit time of the transmission Rayleigh wave. According to the invention, the detection of incident ultrasonic Rayleigh waves, reflected ultrasonic Rayleigh waves and transmitted ultrasonic Rayleigh waves is realized by moving the sample piece or the pulse laser and the laser interferometer through the linear motion platform, the height of the surface defect is calculated, the detected sample piece does not need to be clamped for the second time in the detection process, and high-efficiency in-situ quantitative detection is realized. In addition, nondestructive testing of the tested sample piece is achieved under a thermoelastic mechanism, the contact type defect of traditional ultrasonic testing is overcome, and the device is suitable for special environments such as high temperature, high pressure, intense radiation and strong corrosion.

The invention discloses a wear state and precision degradation prediction method for a ball screw drive system, and the method comprises the steps: employing a dual-label obtaining strategy, and constructing a'strong label + weak label 'mixed label sequence covering a whole life cycle; mapping a macroscopic working condition into a contact interface micromechanical state quantity, and converting a time domain signal into a travel domain / space domain stable sequence by adopting equal travel synchronous resampling, so as to weaken the influence of speed fluctuation on feature extraction; a double-flow physical guidance neural network is further constructed, and a physical attention mechanism is introduced to realize data feature and physical prior fusion; training is completed based on supervision loss and physical consistency constraint, and online recursive correction is carried out by using sparse laser interferometer calibration data. By adopting the method, the prediction deviation caused by equipment aging and working condition change can be reduced, and stable prediction of the wear state and the repeated positioning error degradation trend is realized.

The invention discloses a double-path laser interferometer, a grating measurement method and an optical detection system, and relates to the technical field of optical detection.The double-path laser interferometer comprises a laser light source for providing a laser beam, the light splitting module is used for splitting the laser beam into a first light beam and a second light beam, and the first light path module is used for enabling the first light beam to enter a measured grating and receiving first diffraction light emitted by the measured grating to form a first interferogram; the second light path module is used for enabling the second light beam to enter the measured grating and receiving second diffraction light emitted by the measured grating to form a second interferogram; the imaging acquisition modules are arranged on the light emitting sides of the first light path module and the second light path module respectively, and the imaging acquisition modules are set to determine the measurement result of the measured grating according to the first interference pattern and the second interference pattern, so that the measurement efficiency of the uniformity of the grating is improved on the premise that the measurement precision is not sacrificed.

The invention discloses a dynamic calibration control method for the detection precision of a non-standard automatic testing fixture, and particularly relates to the field of industrial automation and control, which comprises the following steps of: constructing a real-time dynamic error field model of the testing fixture; a distributed optical fiber sensing network and a miniature laser interferometer cooperatively collect real-time detection data and spatial-temporal variation errors under a multi-physics coupling effect, a precision degradation track is predicted based on spatial-temporal variation error data, a pre-compensation signal is generated, and a self-adaptive Kalman filtering algorithm is adopted to generate a precision compensation parameter. Environment temperature, vibration and electromagnetic interference data are monitored in real time, environment disturbance data are generated, a hybrid controller combining nonlinear model predictive control and reinforcement learning is adopted, multi-source data are fused, a calibration instruction is generated through multi-target optimization, and an execution mechanism is driven to achieve online dynamic calibration. And digital threads and transfer learning are integrated to realize full-life-cycle data closed-loop management and continuous optimization.

Provided are a laser interferometer capable of reducing the frequency of a signal calculated and processed in a demodulation circuit and reducing the cost of the demodulation circuit, and a spectroscopic device provided with the laser interferometer. A laser interferometer is provided with: an optical modulator that adds a modulation signal to laser light using a resonator element; a light receiving element that detects a change in the intensity of the laser light including the sampled signal and the modulated signal, and outputs a laser reception signal; a signal oscillation unit that generates a reference signal of a first frequency with the vibration element as a source vibration; and a demodulation circuit that demodulates the sampled signal from the laser reception signal on the basis of the reference signal, the demodulation circuit comprising: a DC offset removal unit that removes the offset; a first phase regulator that regulates the phase of the reference signal; a first multiplier that multiplies the laser reception signal by a reference signal; a first filter; a second multiplier multiplying the first multiplication signal by a reference signal; a second filter; and a phase calculator that calculates a phase.

The invention relates to a global measurement field construction method for a complex scene, and the method comprises the steps: fixedly arranging a plurality of target seats which are suitable for the placement of laser reflection target balls of a laser tracker in the scene, and enabling the target seats to serve as visual reference points; laying a laser tracker station; measuring three-dimensional coordinate values of the laser tracker stations and the visual reference point and laser interference ranging values of the laser tracker stations and the visual reference point, and obtaining measurement data of the visual reference point under different laser tracker stations; the method comprises the following steps: constructing a spatial transformation relationship among station coordinate systems of laser trackers, converting measurement data of the laser trackers to a global coordinate system, and constructing a global measurement field; and carrying out adjustment optimization on the obtained global measurement field. According to the method provided by the invention, high-precision measurement field construction oriented to large-size complex-structure parts is realized, the precision and robustness of coordinate calculation are improved, and the problem that traditional measurement field construction in a complex scene is easy to block is effectively solved.

The invention relates to an anti-falling device integration method and system based on light guide rail coupling and deformation control, and the method comprises the following steps: carrying out the stress distribution scanning of a light guide rail through a laser interference measurement system, and obtaining a guide rail stress distribution map; based on the guide rail stress distribution map, carrying out dynamic rigidity analysis on the light guide rail to obtain a guide rail rigidity characteristic curve; carrying out coupling calculation on the light guide rail based on the guide rail rigidity characteristic curve to obtain guide rail coupling parameters; based on the guide rail coupling parameters, structural design and layout optimization are conducted on the anti-falling device, and an anti-falling device integration scheme is obtained; and performing virtual assembly and performance simulation on the integration scheme of the anti-falling device to obtain a performance evaluation report of the anti-falling system, thereby solving the technical problem that the integrated design of the anti-falling system generally lacks in-depth analysis on the mechanical characteristics of the guide rail body, so that potential safety hazards are difficult to find and correct in time.

The invention discloses a nanoscale high-precision positioning method based on a multi-degree-of-freedom motion workbench, and relates to the field of large-stroke and high-precision positioning, and the method comprises the steps: S1, initializing the motion workbench, and guaranteeing that a system is in a zero position state; s2, sending a target position instruction by the upper computer, and driving the macro moving platform to quickly move to a position near a target; s3, acquiring the current position, calculating the deviation from the target position according to the target displacement and the current actual feedback displacement value, and generating micropositioner control parameters; s4, a control instruction is generated, and nanoscale displacement compensation is executed; and S5, iteratively correcting the displacement of the micropositioner until the deviation fed back by the laser interferometer meets the requirement. According to the invention, the positioning precision of large-stroke (hundred millimeters) movement is improved to a nanometer level, the device is suitable for the fields of photoetching machines, ultra-precision machining, biological micromanipulation and the like, and the equipment performance and the process level are improved. In addition, the system adopts a modular design, can adapt to different driving and sensing units according to requirements, and has strong expansibility.

The invention discloses an ultralow-temperature cascade refrigeration device, belongs to the technical field of refrigeration devices, and solves the problems that when a low-temperature screw compressor continuously operates below-80 DEG C, organic acid generated by hydrolysis of trace moisture and ester lubricating oil and metal chips form colloidal deposition, the resistance of a slide valve is increased, displacement lag is caused, and the service life of the slide valve is prolonged. However, the sensor only feeds back an instruction signal and cannot be monitored by a control system, and finally bearing wear or energy efficiency reduction is caused. Comprising a screw compressor and a slide valve state monitoring circuit arranged in the screw compressor. The actual displacement of the slide valve is measured in real time through double-frequency laser interference, the thickness of jelly is analyzed in combination with acoustic surface wave frequency shift, the fault index is calculated after dynamic compensation, early warning is conducted when the limit is exceeded, a blind area of a traditional sensor is eliminated, diagnosis is conducted in advance, and compressor bearing abrasion is avoided.

The invention relates to the technical field of optics, in particular to blade front and tail edge polishing and correcting equipment which comprises a clamp for loading a to-be-detected guide vane, a polishing system is arranged beside the clamp, and the to-be-detected guide vane is vertically placed on the clamp; the system also comprises a laser interferometer system. The laser interferometer system comprises a laser and a beam splitter, and the beam splitter splits a measuring light beam and a reference light beam; linear collimating lenses are respectively arranged on light paths of the measuring light beam and the reference light beam, and the measuring light beam and the reference light beam respectively penetrate through the collimating lenses to form horizontal linear light beams. On-line real-time detection is achieved through the laser interferometer system, the defect portions of the front edge and the tail edge of the guide vane are accurately positioned, the polishing head can conveniently move to the defect portions to conduct fine polishing, the production period is shortened, and the production cost is reduced.

The invention belongs to the technical field of aircraft assembly measurement, and particularly relates to an aircraft assembly tool measurement field measurement reference point spacing laser tracker measurement method, which comprises the following steps of: calibrating and constructing a distance measurement coordinate system by adding an alignment measurement point to be combined with a reference measurement point and utilizing an absolute distance measurement function of a laser tracker; and a multi-degree-of-freedom precision adjustment structure of the articulated arm robot is utilized to position the laser tracker on an epitaxial line of the reference measurement points, so that the high-precision measurement of the distance between the two reference measurement points is realized, the networking measurement error of the laser interferometer can be corrected in a high-precision manner, and the high-precision measurement of a large aircraft assembly site is realized.

The invention provides a composite material machine tool machining precision real-time measurement and thermal deformation compensation control method and system, and relates to the technical field of composite material machining. Collecting data through a temperature sensor and a displacement sensor; establishing a multi-dimensional thermal deformation prediction model; measuring the position of the cutter in real time by adopting a laser interferometer; constructing a self-adaptive compensation controller, and generating a compensation instruction by adopting a fuzzy PID control algorithm; and sending the compensation instruction to a numerical control system to realize real-time compensation of the processing track. Closed-loop control over the machining precision of the composite machine tool is achieved, and the machining precision is improved.

The invention discloses a laser piston sounder normal vector microphone low-frequency calibration device and method, and solves the technical problems that the calibration frequency range is limited, the model dependence is strong and the environmental noise interference is obvious in a low-frequency band in the existing vector microphone calibration method. The device comprises a piston sounder, a laser interferometer, a vector microphone and a data acquisition system, the piston sounder comprises a piston, an excitation source and a piston cavity, an end cover of the piston cavity is provided with an optical window, and the laser interferometer measures the movement speed and displacement of the piston through the optical window; the vector microphone is hermetically coupled to the piston sounder from the side wall of the piston cavity through the adapter; and electric signal outputs of the laser interferometer and the vector microphone are connected to an input channel of the data acquisition system. The calculation model of the sound pressure and the particle vibration velocity in the piston sounder is clear, does not depend on the type of a piston excitation source, and is high in universality.

The invention discloses a laser interferometer plane reflection mirror surface type error compensation method based on redundancy characteristics. The method comprises the following steps of: establishing a composite compensation model containing a rotating surface type error and a translation surface type error based on a redundant measurement characteristic of an X / Y-direction measurement light beam on an Rz degree of freedom; the rotating surface type error model is constructed through Rz degree-of-freedom redundant data of a measurement light beam, and the translation surface type error model is established based on a geometrical relationship between a rotating error gradient and a measurement light beam interval. And compensating the two types of surface type errors to an interferometer measurement model by adopting a parameterization compensation mechanism, and realizing dynamic error correction through an iterative optimization algorithm. The method can effectively solve the problem of measurement precision caused by deformation of the reflector surface, and provides a reliable measurement basis for an ultra-precise motion control system.

The invention relates to a corrugated steel web accurate positioning device, and relates to the technical field of steel structure construction in bridge engineering, the corrugated steel web accurate positioning device comprises a frame body and a steel web body, the upper end of the frame body is provided with a laser interferometer, one side of the frame body is provided with a controller, the middle part of the frame body is provided with a sliding groove, and two sides of the sliding groove are provided with through grooves; and a hydraulic cylinder is fixed to the inner wall of the upper end of the sliding groove, a sliding block is fixed to the driving end of the hydraulic cylinder, a fixing rod is fixed to one end of the sliding block, a connecting structure is arranged on the fixing rod, and a plurality of clamping frames are arranged on the connecting structure. The hydraulic cylinder drives the sliding block to move, on one hand, the effect of step-by-step positioning is achieved, the effect of improving the use effect of the positioning device is achieved, on the other hand, the effects of automatic sealing and cleaning are achieved, the use convenience of the positioning device is effectively improved, on the other hand, the effect of self-adaptive balance weight adjustment is achieved, and the use safety is improved. And the use stability of the positioning device is effectively improved.

The invention belongs to the technical field of deformation monitoring equipment, and particularly relates to deformation monitoring equipment based on steel structure installation and a monitoring method.The deformation monitoring equipment comprises a frame, walking wheels are symmetrically arranged at the bottom of the frame, a level gauge supporting disc is arranged in a containing groove, a supporting block is fixedly installed on the supporting disc, and a support is arranged on the supporting block; a laser interferometer used for monitoring deformation of the steel structure is arranged in the support, an emitter is arranged on one side of the laser interferometer, and an adjusting assembly used for adjusting the angle of the laser interferometer is arranged on the support. According to the deformation monitoring equipment based on steel structure installation and the monitoring method, sealing protection can be carried out on the space where the emitter is located through the arranged circular ring, movement of the adjusting assembly can be carried out, and the angle of the laser interferometer can be adjusted, so that after the emitter moves to be located in the same center line with the circular ring groove, the first electromagnet is controlled to stop working; the driving spring resets to push the circular ring to move, the circular ring moves to drive the rubber ring to move, and the space where the emitter is located can be sealed and protected.

The invention relates to a dual-frequency laser interference measurement system phase resolving method based on a digital phase-locked loop. According to the method, a reference signal is subjected to photoelectric conversion to generate a sampling clock, and a measurement signal is sampled according to the sampling clock. Phase data can be obtained by analyzing the sampled measurement signal. The technology has the advantages that the influence of laser frequency difference fluctuation is eliminated, high-precision real-time calculation of the phase of the double-frequency laser interferometer is realized, the calculation process is remarkably simplified, and resource occupation is reduced.

The invention discloses a grooving positioning system based on a paperboard digital intelligent grooving machine, relates to the technical field of grooving machine positioning adjustment, and solves the technical problems of insufficient transverse deviation adjustment precision and incomplete longitudinal deviation compensation. Proportional, integral and differential parameters of the incremental PID are dynamically adapted according to the deviation, compared with a fixed parameter PID, the adjustment response time is shortened, the overshoot is controlled within + / -0.01 mm, the transverse positioning precision is improved, and the high-precision grooving requirement is met. A total error model of a linear error and a periodic error is established through a laser interferometer for encoder error calibration. And in combination with a PLC position-compensation amount comparison table, encoder positioning errors are reduced, dynamic environment compensation fits a paperboard stretching model through a humidity sensor, an equipment thermal deformation model is established through a temperature sensor, temperature and humidity influences are comprehensively compensated, and the longitudinal positioning precision fluctuation range is narrowed.

The embodiment of the invention provides a blade tip timing non-contact measurement method and system based on laser interference, belongs to the technical field of blade tip monitoring, and solves the problems that an existing method depends on an advanced signal processing algorithm to extract vibration characteristics, but cannot solve the problems of high-frequency signal aliasing, phase noise suppression and multi-target crosstalk. The method comprises the steps that a high-bandwidth photoelectric detector is used for responding to and obtaining an interference signal, and self-adaptive phase solution and timestamp capture are conducted on the interference signal based on a self-adaptive phase unwrapping method in combination with a dynamic signal compensation mechanism. According to the method, the interference signals are processed on the basis of the self-adaptive phase unwrapping method in combination with a dynamic signal compensation mechanism, signal phase solution information can be effectively extracted, noise is effectively suppressed, multi-blade signal crosstalk is separated, and the method is suitable for being applied to the field of multi-blade multi-modal parameter identification and analysis. And more accurate blade tip multi-modal parameters are obtained.

The invention relates to the field of linear rolling guide rails, and discloses a linear rolling guide rail pair straightness error measuring system which comprises a workbench, the top of the workbench is fixedly connected with a laser interferometer, the top of the workbench is fixedly connected with a measured guide rail, the top of the measured guide rail is slidably connected with a concave frame, and the concave frame is fixedly connected with the laser interferometer. The concave frame is provided with a CCD camera, a beam splitter prism and a moving target. A modularized framework of light source emission, light splitting, reflection receiving and data processing is adopted, all the modules are in precise cooperation, the laser interferometer provides a stable reference light path, the beam splitter prism constructs a high-precision interference light path, the CCD camera achieves sub-pixel-level light spot collection, and the laser interferometer provides a high-precision interference light path. The data processing module achieves real-time calculation of straightness errors through a gray scale weighted centroid method and a least square method, the dynamic measurement requirement of the high-speed guide rail (2 m / s) is met, the calculation efficiency and precision reach the industry leading level, and a reliable solution is provided for online detection and machining process control of the precise guide rail.

The invention relates to the technical field of optical free-form surface non-contact measurement, and discloses a free-form surface contour detection method and device based on confocal fixed-focus normal vector measurement, and the detection device comprises a normal vector measurement sensor, a precise motion platform and a computer. Synchronously acquiring position information of the laser interferometer, light spot centroid offset of a normal measurement light beam of the two-dimensional position detector and light intensity information of the focus detector by using a data acquisition card; wherein the precise motion platform comprises a scanning workpiece table, an objective lens driver, a Z-direction macro displacement guide rail and a motion controller, and the motion controller is used for controlling the scanning workpiece table, the objective lens driver and the Z-direction macro displacement guide rail to execute high-precision displacement; and the computer sends a scanning measurement sampling point of the measured free-form surface to the motion controller so as to realize scanning measurement of the measured free-form surface. According to the invention, the surface contour of the free-form surface can be reconstructed by fitting the normal vector of the focus position, and high-precision detection of the contour of the free-form surface is realized.

The invention provides a laser ultrasonic equipment fixing device for identifying micro-damage on the surface of a high-temperature service pipeline, which comprises an upper bracket and a lower bracket, and openings of the upper bracket and the lower bracket abut against each other and can be mounted on a to-be-detected pipeline. A support locking piece is arranged at the abutting position of the upper support and the lower support to fix the upper support and the lower support together. The upper support and the lower support are each provided with a plurality of pipeline fasteners, and the distance between each pipeline fastener and the outer surface of a to-be-detected pipeline can be independently adjusted. When the device is used, the upper bracket and the lower bracket are fixed on the outer surface of a to-be-detected pipeline by using the bracket locking piece, and the pulse laser and the laser interferometer which are used for detecting the damage of the outer surface of the pipeline are integrated on the upper bracket, so that the whole device is compact in structure and only occupies the peripheral space of the pipeline; and the pulse laser and the laser interferometer are not in direct contact with the high-temperature to-be-measured pipeline, so that the effects that the occupied space is small, the device can adapt to a complex pipeline environment and the service life of equipment is prolonged are achieved.

The invention provides a reflecting mirror gradient curing bonding device and bonding method based on in-situ deformation correction, and belongs to the technical field of optical precision manufacturing. According to the method, the problems of interface thermal stress mismatch and interface bonding dynamics defects existing in a traditional bonding and curing process are solved. The device comprises a temperature control box, a control center, and an industrial camera, a laser interferometer, a first position adjusting mechanism, a second position adjusting mechanism, a positioning clamping mechanism, a force-heat coupling regulation and control module and a gluing mechanism which are arranged in the temperature control box and are in signal connection with the control center. The compound temperature control assembly and the piezoelectric ceramic actuator are controlled to act through the regulation and control main body, the curing temperature of the adhesive layer is controlled through the compound temperature control assembly, and compensation force is applied to the reflector through the piezoelectric ceramic actuator. The method is used for curing and bonding the reflecting mirror and the reflecting mirror bracket.

The invention provides a gantry numerical control milling machine high-precision curved surface machining method based on multi-axis linkage compensation, and belongs to the technical field of numerical control machining, and the gantry numerical control milling machine high-precision curved surface machining method comprises the steps of S1, constructing a gantry numerical control milling machine multi-axis error model, the method comprises the following steps: measuring positioning errors, reverse clearance errors and perpendicularity errors of all axes of a gantry numerical control milling machine and synchronous errors during multi-axis linkage through measuring equipment such as a laser interferometer and a ball bar, and establishing a comprehensive error model comprising geometric errors, thermal deformation errors and multi-axis linkage errors of a machine tool; according to high-precision curved surface machining of the gantry numerical control milling machine, the machining precision and efficiency are remarkably improved through multi-dimensional technical innovation. In the aspect of error processing, a comprehensive error model is constructed, various errors such as geometry, thermal deformation and multi-axis linkage are accurately covered, and a solid data foundation is provided for compensation; in the machining process, the error compensation amount is dynamically adjusted by combining curved surface gridding and layered milling with real-time feedback.

The invention relates to the technical field of machine tool design, and provides a thermal error prediction method and system for a numerical control machine tool feeding system based on Transform-GRU, and the method comprises the steps: S1 to S5, collecting the data of a numerical control feeding system through a temperature sensor, an acceleration sensor and a laser interferometer; and aligning the collected temperature data, vibration data and thermal error data on a time axis and fusing the data into multi-source information fusion data. And dividing the multi-source information fusion data into a training set and a test set, training a model to obtain a trained model, and if an error is smaller than a preset value, outputting a predicted value. The invention also discloses a test system and a thermal error prediction system. According to the method and the system, the thermal error prediction model can be trained and predicted, the effectiveness of the thermal error prediction model is verified through comparative analysis, local dynamic changes in a time sequence can be captured, the prediction precision and stability are improved, the structure is simple, the number of parameters is small, the convergence speed is higher, and the time cost is lower.

This invention discloses a sub-aperture stitching interferometric measurement device and method for optical freeform surfaces. The device includes a laser interferometer, a variable phase compensator, and a multi-axis motion stage for motion control of the mirror under test. The variable phase compensator consists of two freeform surface mirrors and two wedges, used to achieve phase compensation with a large dynamic range for each sub-aperture. The system automatically adjusts the compensation phase of the sub-apertures using a weighted stochastic gradient descent algorithm and performs in-situ measurement of the compensation phase using a micro-translation misalignment measurement method. The system can realize three measurement modes: full aperture coverage stitching measurement, sub-aperture coverage stitching measurement, and comprehensive measurement. This invention enables high-precision measurement of flexible, complex optical freeform surfaces (such as gull-wing surfaces).