64results about How to "Realize real-time compensation" patented technology

The invention relates to a virtual error compensation system of a numerical control machine in the technical field of numerical control machining, comprising an external data acquisition module, a digital modeling module, a data optimization module, a dynamic modeling module, a model generalization module, an error fitting module, an error compensation module and a communication module. In the invention, a multi-module nesting mode is adopted; the external information acquisition module is used for acquiring environment information, numerical control machine information, cutting amount, cutter parameters, and the like; an error model is generated by the acquired information through the dynamic modeling module and the model generalization module; the error fitting module outputs an error fitting curve; the error compensation module outputs NC (Numerical Control) codes; and the communication module realizes the real-time communication with a CNC (Computer Numerical Controller) and data acquisition through a COM (Component Object Model) serial port and an RS232 serial port. The system of the invention can be used for predicting comprehensive errors of the numerical control machine under various cutting conditions and realizing real-time error compensation.

The invention provides a method for compensating imaging dithering of airborne imaging equipment. The method adopts a rate gyroscope to measure the angular speed of the visual axis of a CCD camera inreal time, obtains the angular displacement of the visual axis by using an integrator for integration, measures the practical using focus of an optical zooming system by a displacement sensor, obtainsthe image displacement value of the CCD camera at the image surface due to the dithering by the calculation of a computer processing unit, and carries out reverse compensation to the image. The method has simple structure and brief algorithm, reduces calculation workload, inhibits the dithering of the image and improves the quality of the video image.

The disclosure relates to the technical field of display and particularly to an OLED pixel compensation method, an OLED pixel compensation device, and a display device. The compensation method comprises steps of: testing driving transistors of the N-th row of sub-pixels to obtain first test information; testing driving transistors of the M-th row of sub-pixels to obtain second test information; calculating a compensation parameter based on the first test information and the second test information; and compensating the N-th row of sub-pixels, the M-th row of sub-pixels and successive a rows of sub-pixels from the N-th row and the M-th row, wherein N = an + b, M = an + c, A >= 2, 0 <= b < a, 0 <= c < a, and a, b, c, n are all integers. The compensation method and device achieve real-time brightness compensation by shortening the update period of the compensation data, thereby improving a compensation effect.

The invention discloses a phase delay extraction and compensation method for PGC phase demodulation. A sinusoidal phase modulation interferometric signal is converted into a digital interferometric signal through an analog-to-digital converter after amplifying and filtering, first-order, second-order and fourth-order harmonics of the digital interferometric signal are subjected to orthogonal downmixing simultaneously, and three pairs of orthogonal harmonic amplitude signals are obtained. Phase delays are extracted from the three pairs of orthogonal harmonic amplitude signals, and corresponding phase delay correction coefficients are calculated out by using the phase delays. The phase delay correction coefficients are multiplied by the absolute harmonic amplitude signal equal to the sum ofthe absolute values of the orthogonal harmonic amplitude signals to obtain new harmonic amplitude signals which are not affected by the phase delays, and then a to-be-measured phase is obtained through antitangent operation. The problems are solved that in the PGC phase demodulation technology, phase delay is difficult to measure and non-linear errors caused by the phase delay are difficult to compensate for in real time, the phase measurement accuracy is improved, and the method is widely applied to the technical field of sinusoidal modulation interference.

The invention discloses a self-adaptive real-time compensation system for a steel support axial force during deep foundation ditch construction and a method thereof. The compensation system comprises a plurality of field control stations, a plurality of hydraulic proportion servo control pump station devices, a plurality of detecting elements, an operation station and a monitoring station, wherein the field control stations, the operation station and the monitoring station are connected and communicated through a CAN bus; each field control station is connected with the plurality of the hydraulic proportion servo control pump station devices; the hydraulic proportioning servo control pump station devices comprise hydraulic pump stations and a plurality of jacks, and the hydraulic pump stations are respectively connected with the jacks and control the jacks to hold up corresponding steel supports; each detecting element respectively detects the operating situation of the jacks and feeds information back to the field control stations to which the jacks belong; and the monitoring station and the operation station monitor the real-time operating situations of the hydraulic pump stations and set the operating parameters of the jacks. The invention can realize real-time compensation of the steel support axial force during deep foundation ditch construction so as to reduce the deformation of a foundation ditch.

The invention relates to a compensation method of two-freedom wave compensation system based on sea-sky line detection. The compensation method comprises the following steps: building a compensation system, collecting an image, calculating expansion and contraction quantity of compensation hydraulic cylinders, performing primary compensation and secondary compensation. The compensation method has the advantages that the horizontal attitude angle of a ship body is calculated according to a sea-sky line image collected by a CCD (Charged Coupled Device) industrial camera, the horizontal attitude angle is transmitted to an industrial control machine, the industrial control machine is used for performing inverse solution to obtain the expansion and contraction quantity of four hydraulic cylinders; a calculated compensation value is converted from a digital signal to an analog signal through a D / A converter; the analog signal is transmitted to an electrolyte server valve through a server amplifier; the server valve is used for controlling the expansion and contraction quantity of four compensation hydraulic cylinders according to the processed analog signal to realize real-time compensation for the rolling and pitching of an operation device on a movable platform; closed-loop control is performed through the difference between a measured value and a calculated valve, and the stability of the compensation system is further enhanced.

The invention discloses a real-time compensation method based on the motion prediction of a least squares support vector machine (LS-SVM) in a stable imaging system. The method comprises the followingsteps: firstly, establishing an LS-SVM motion prediction model and setting a parameter; then collecting motion detection data of the imaging system so as to train the motion prediction model; then, outputting a motion vector predicted value of a certain time in the future when a motion vector value of the current time is input; and finally, carrying out digital-to-analogue conversion on the motion vector predicted values by a stable compensation system to generate a compensation vector so as to control a compensation mechanism to carry out real-time compensation on a current motion of a camera. The invention can quickly and accurately predict the current motion state of the camera under the condition of an unknown camera motion model so as to achieve the purposes of detecting, delaying, predicting and compensating the motions, realize the real-time compensation of the motions of the camera, and improve the working performance of the stable imaging system.

The invention provides a display panel and a manufacturing method thereof and a method for driving the display panel. The display panel comprises an array substrate and a controller, wherein a plurality of pixel units are arranged on the array substrate; light-emitting elements are arranged in the pixel units; reflective layers and optical sensors electrically connected with the controller are arranged in at least a part of the pixel units; the reflective layers are arranged in the light-emitting directions of the light-emitting elements and used for reflecting the emergent light emitted fromthe light-emitting elements to the optical sensors; the optical sensors are used for measuring the real-time intensity of the reflected light; and the controller is used for adjusting the light-emitting intensity of the light-emitting elements to approach the theoretical intensity according to the real-time intensity. The display panel has the beneficial effects that the real-time compensation ofthe emergent light emitted from the light-emitting elements of the pixel units can be realized; the defect of poor display effect due to aging or badness is overcome; a good display effect can still be realized after long-time use; and the structure is simple and the overall structure of the display panel needs not to be changed, so that the display panel is easy to realize in process and the industrial production is easy.

The invention discloses an underwater acoustic two-way distance-measuring error compensation method applied in the dynamic condition of a multi-AUV coordinative navigation system. According to the method, at the moment t0, an AUV (a) sends a ranging request command to an AUV (b). At this time, the distance between the AUV (a) and the AUV (b) is a0b0. At the moment t1, the AUV (b) receives the ranging request command sent from the AUV (a). At this time, the propagation distance of an underwater signal is a0b1. After the fixed delay of tau seconds, the AUV (b) sends a reply response signal to the AUV (a) at the moment t2. At this time, the distance between the AUV (b) and the AUV (a) is a2b2. At the moment t3, the AUV (a) receives the reply response signal sent by the AUV (b) and then calculates the underwater acoustic propagation distance according to the round-trip propagation time of the underwater signal. The AUV (a) sends the measured underwater acoustic distance together with its own location information and the speed information thereof in the west, in the north and in the skyward direction to the AUV (b). The AUV (b) receives the information sent by the AUV (a) and then calculates the error of the underwater acoustic distance. Meanwhile, the AUV (b) compensates the underwater acoustic propagation distance based on the error. The method is high in measurement precision and good in cooperative navigation effect.

The invention discloses an iterative-calculation-based real-time compensation method for a PGC phase demodulation error. Multiplication and low-pass filtering processing are carried out on an interference signal and a local reference signal to obtain one pair of orthogonal signals; the pair of orthogonal signals is inputted into an iterative-calculation-based correction coefficient calculation module; a square vector is calculated by the orthogonal signals in the module and a prediction error and a gain matrix are further calculated; amplitudes of the orthogonal signals are predicted; multi-times iterative calculation is performed and then amplitude correction coefficients of the orthogonal signals are calculated; the amplitudes of the orthogonal signals are corrected to be 1 by using theamplitude correction coefficients and a divider; and then antitangent operation is performed on the corrected orthogonal signals to obtain a to-be-calculated phase. Therefore, a problem that the nonlinear error caused by the carrier phase delay and the modulation depth can not be compensated in real time easily in the PGC phase demodulation is solved. The iterative-calculation-based real-time compensation method having the advantage of good real-time performance can be widely applied to the technical field of sinusoidal phase modulation interferometry.

The invention belongs to the field of spectrum instruments, and provides a novel Full-fiber Fourier transform spectrometer, which improves the precision and the reliability of the FFTS instrument, eliminates noise and artifacts, and has the characteristics of miniaturization, portability and the like. The technical solution adopted by the invention is a full-fiber Fourier transform spectrometer based on the PZT phase modulation real-time compensation, and the structure is as follows : the sensing arms of the two optical fiber interferometers are wound on the same optical fiber phase modulatorPZT, so that the two optical fiber interferometers are fully synchronized and consistent; the test light enters one input end of the broadband coupler WIC1 through a coupling lens, and is divided intotwo bundles of 50:50 through the coupler WIC1, one bundle of fibers wound by the piezoelectric ceramic phase modulator in parallel, and the other bundle passing through the arm length matching fiber., respectively, enters the input end of the wideband coupler WIC2, and forms interference fringes at its output end after passing through the wideband coupler WIC2. The full-fiber Fourier transform spectrometer based on PZT phase modulation real-time compensation is mainly applied to the field of spectrum detection.

The invention discloses a real-time compensation decoupling method for spacecraft platform disturbance by a spaceborne radar. The method includes that when the spaceborne radar searches, a three-axis stabilization rate gyroscope real-timely detects changing amount and changing direction of a spacecraft platform attitude angle; the changing amount and the changing direction of the spacecraft platform attitude angle are subjected to transformation of coordinates to obtain changing amount and changing direction of a spaceborne radar attitude angle; when the changing amount of the spaceborne radar attitude angle exceeds a preset threshold value, the spaceborne radar sets a searching compensatory angle; the value of the searching compensatory angle is the changing amount of the spaceborne radar attitude angle; the compensation direction of the searching compensatory angle is vertical to the searching direction of the spaceborne radar and opposite to the changing direction of the spaceborne radar attitude angle; a servo mechanism of the spaceborne radar performs real-time compensation controlling on the spaceborne radar attitude angle according to the searching compensatory angle. According to the real-time compensation decoupling method and a compensation decoupling system for spacecraft platform disturbance by the spaceborne radar, own resources of a spacecraft platform are utilized, real-time compensation of the servo mechanism of the spaceborne radar is achieved, valuable volume, weight, and power consumption resources of a spacecraft can not be occupied, and resources are saved.

The invention discloses a display compensation method and device, a computer readable storage medium and computer equipment. The display compensation method and device can be applied to compensation of an aged display panel of a light-emitting device, and includes the steps: in the current compensation stage, firstly, acquiring a current brightness sensing value of a current environment when a display panel does not emit light; acquiring current frame data to be displayed, and then, according to the current to-be-displayed frame data and a predetermined target gray scale, displaying the to-be-displayed frame data; determining target display data corresponding to the target gray scale, and controlling the sub-pixels corresponding to the target display data to emit light by adopting the target display data so as to obtain target brightness sensing values corresponding to the light-emitting sub-pixels; and finally, compensating the target display data corresponding to the corresponding sub-pixels according to the current brightness sensing value and the target brightness sensing value of the current environment, a pre-stored initial optical brightness value and a preset gray scale compensation lookup table, so that real-time compensation of the display panel can be realized.

The invention discloses a voltage compensation and fault current limiting hybrid system and a control method thereof. The hybrid system control method comprises three parts of direct current voltage stabilization module control, voltage compensation module control and fault current limiting module control. The direct current voltage stabilization module control uses SVPWM control to provide an active power energy exchange channel for a direct current side. The voltage compensation module control uses wide area prediction change PI control, and carries out precise tracking compensation on voltage fluctuations of a power grid. According to the control method provided by the invention, real-time voltage compensation can be effectively realized; short-circuit current can be timely limited; and the reliability and the safety of power supply of the power grid are improved.

The invention discloses an energy storage system with a peak-load shifting and demand adjustment strategy. The system is composed of a plurality of energy storage units. Each energy storage unit consists of an energy storage inverter and a battery management system connected with the energy storage inverter; and each battery management system manages a plurality of batteries. In addition, the system also includes a first smart meter and a power management platform. The first smart meter connected with the power management platform is used for acquiring an actual power consumption power Pr of acurrent grid and sending the actual power consumption power Pr to the power management platform; the power management platform is used for determining whether the current actual power consumption power Pr is larger than a preset reported demanded power Pset and acquiring a difference value delta P between the current actual power consumption power Pr and the preset reported demanded power Pset when the current actual power consumption power Pr is larger than the preset reported demanded power Pset; and the energy storage unit is used for compensating an electric power according to the difference value delta P, determined by the power management platform, between the actual consumption power and the reported demand. In addition, the invention also discloses a control method. Therefore, on-demand control of the smart grid is realized.

The invention discloses a gas shielded welding oscillator with a welding joint tracing function and belongs to a welding automation control device. The gas shielded welding oscillator with the welding joint tracing function mainly solves the technical problems of large welding joint gap and the like due to the fact that an existing oscillator is incapable of detecting and compensating a workpiece processing error, an assembly error, welding heat deformation and the like errors in real time. According to the technical scheme, the gas shielded welding oscillator with the welding joint tracing function comprises a Hall sensor, a welding joint tracing controller with a welding joint gap compensation function, a driver and a double-effect swinging mechanism, the welding joint tracing controller detects and compensates the welding joint gap caused by workpiece processing errors, assembly errors and welding heat deformation in real time according to signals gathered by the Hall sensor, and under the electric control and the driver control, the double-effect swinging mechanism freely changes between horizontal swinging and pendular swinging and automatically regulates the swinging amplitude and swinging frequency. The gas shielded welding oscillator with the welding joint tracing function is mainly used for welding.

Disclosed is an iGPS dynamic measurement error real-time compensation method for aircraft automatic assembly. The method comprises nine big steps: I, determining a measurement target, and planning a measurement range; II, building an iGPS two-station measurement system; III, obtaining coordinate information of the measurement target; IV, solving angles of the measurement target; V, solving basic parameters of light beams of an emitter; VI, correcting the basic parameters of the light beams of the emitter; VII, solving correction coordinate information of the measurement target; VIII, repeating the step III to the step VII, and correcting a second emitter; and, IX, solving dynamic measurement information of the measurement target. The method solves the problem that a redundancy error is introduced when an iGPS performs real-time tracking measurement on the measurement target in the aircraft assembly process, and the object of real-time monitoring for the aircraft assembly process is achieved finally.

The invention relates to an ablation ground simulation test device and method based on ablation backing amount compensation, and belongs to the technical field of aerospace vehicles. The method comprises the steps that a heated response video of a tested model in the test process is collected, the surface boundary of the model is captured through the image processing technology, the surface boundary movement change dynamic information is obtained, the surface ablation backing rate of the tested model is obtained through identification, the surface backing rate or the backing amount is fed backto a servo control system, the position deviation caused by surface backing of the tested model is compensated through a servo motor and a transmission system, and the stability of the environment state of the tested model in the test process is guaranteed.

The invention discloses a fast compensation method for the electric performance of a deformed array antenna under a dynamic load based on a least square method. The method comprises the following steps: 1) according to geometric model parameters and material attributes of the array antenna, establishing a structural finite element model; 2) selecting the vibration mode and natural frequency of theantenna model according to the frequency distribution range of the dynamic load; 3) calculating compensation excitation current; 4) using the new excitation current to compensate the electrical performance of the deformed array antenna. The invention utilizes the mode superposition method to directly correlate the compensation excitation current of the deformed array antenna with the dynamic loadbased on the least square method. As long as the dynamic load in the service environment is known, the real-time compensation of the electrical performance of the antenna array can be realized. Thismethod can obviously improve the deterioration of antenna electrical performance caused by the external environment dynamic load without increasing the system weight and complexity. At the same time,the compensation efficiency is greatly improved. It is ensured that the electrical performance of the deformed array antenna can be compensated in time and work normally in various dynamic load environments.

The invention discloses a numerical control machine tool space error prediction method based on error field feature points. The method comprises the steps of: a. measuring three motion axis errors andperpendicularity errors of a machine tool to obtain a triaxial error data item; b. calculating three items of errors of a machine tool error field feature point space according to the triaxial errordata, and storing the three items of errors in a numerical control system; and c. predicting a machine tool space non-feature point error compensation value according to the error data of eight vertexfeature points of a cube. According to the method, the three motion axis errors and the perpendicularity errors of the machine tool are measured, the three items of errors of the spatial feature points of the machine tool are obtained through calculation according to the triaxial error data, and the errors of any positions of non-feature points located in the cube are predicted according to errordata of the eight vertex feature points of the cube. The method has the advantages of being small in measurement data size, small in calculation amount, high in compensation real-time performance, reliable in precision and the like.

The invention relates to a method and a device for visually identifying an artificial intelligent machine under common and special environments. The invention aims to solve the problem that the prior art is not suitable for multi-field measurement. A light output system is composed of a laser (1), a beam shaping system (2), a rectangular raster (3), a monochrome Fourier transform lens (4), a frequency spectrum selector (5), a wave plate (6), a monochrome multiplying power lens (7) and a high-speed scan mirror (9) which are successively arranged on a precision lead screw (8-1) and a precision guide rail (8-2) in turn along the light path; the light output system is utilized to project sine structured light; a visual collecting identifying system is used for visually collecting and identifying a to-be-identified target (10); the visual collecting identifying system is composed of a computer (14), a telecentric lens connected with the computer (14), a high speed CCD or CMOS (11), a laser ranging system (12) and an internal environment control system (13); a protecting shell (15), in which the light output system and the visual collecting identifying system are arranged, is provided with a radiation protection window used for performing radiation protection on the light output system and the visual collecting identifying system. The device is specifically fit for the continuous output of sine structured light under large-field range measurement from the near to the distant and has the advantage of mode recognition for static, low-speed and high-speed moving objects at different distances and with different characteristics.

The invention relates to a self-calibration method for the thermal deformation of a distorting lens under the effect of high-power continuous laser irradiation and belongs to the technical field of strong laser techniques and adaptive optics. According to the technical scheme of the invention, the thermally deformed surface shape of a distorting lens is self-calibrated. That means, without adopting any heat-exchange measure or changing the structural parameters of the distorting lens, the thermally deformed surface shape of the distorting lens is adjusted in real time by means of a set of driver control signals that are varying along with the time, so that the real-time compensation on the thermally deformed surface shape of the distorting lens is realized. The self-calibration method is applicable to the self-calibration for the thermal deformation of distorting lenses having different laser parameters and under the effects of different laser irradiation time periods. The calibration effect of the self-calibration method is prevented from getting deteriorated along with the increasing of the incident laser power and the laser irradiation time. Meanwhile, the self-calibration method is not dependent on any extra device and can realize the self-calibration function for the thermal deformation of existing discrete drive type distorting lenses.

The invention discloses an electromagnetic damping device for a wheel hub motor of an electric automobile. The electromagnetic damping device comprises the wheel hub motor, a signal acquisition circuit, a core control unit and a driving circuit, wherein the wheel hub motor is provided with an inner stator; a compensating winding is arranged on the inner stator; the driving circuit is provided with a driving bridge arm; the driving bridge arm is electrically connected with the compensating winding; the signal acquisition circuit and the driving circuit are connected with the core control unit respectively; the signal acquisition circuit is used for acquiring a voltage and a current of the wheel hub motor and a current of the compensating winding, and transmitting an acquisition signal to the core control unit; the core control unit is used for outputting a pulse width modulation (PWM) driving signal to the driving bridge arm according to the received acquisition signal in order to perform closed-loop control on the current of the compensating winding; and the compensating winding generates a compensating magnetic field which is superimposed with a magnetic field of the wheel hub motor. Through adoption of the electromagnetic damping device, the phenomenon of electromagnetic torque pulsation of the wheel hub motor can be eliminated. Serving as a supplementary device of a conventional suspension damper, the electromagnetic damping device can further improve the vertical characteristic of the electric automobile.

The invention discloses a real-time height compensating knife stone device. The device comprises a base, and a knife stone mounting seat, a height compensating device and a mounting seat supporting device which are arranged on the base; the height compensating device also comprises a compensating rod and a compensating spring; the lower end of the compensating rod is connected with a isosceles-trapezoid-like lifting block; two sides of the knife stone mounting seat are respectively provided with two locking wedge blocks ejected by push springs; the two locking wedge blocks on any one side respectively form wedge block type locking clamp for the lifting block through two waists of a trapezoid of the lifting block; the knife stone mounting seat is supported by two support blocks having movable V support structures through the push springs; the base is provided with a wedge block type automatic locking mechanism for preventing the support blocks from retracting. The real-time height compensating knife stone device has the beneficial effects that the real-time height compensating knife stone device is simple in structure and provides convenience for machining, the manufacturing cost and the working cost are low, and the abrasion loss of a knife stone is compensated in real time conveniently.

The invention provides a horizontal electroplating bath including a conductive roller (2), a conductive supporting roller (3) and a positive pole plate (4), the conductive roller (2) is used for transmission of a strip steel (1) and conduction of cathodic current in the electroplating process, the conductive supporting roller (3) is used for compacting the strip steel (1) and the conductive roller (2), the horizontal electroplating bath is characterized by also including a tilting device, the tilting device comprises a pivot (6) located at the positive pole plate end, under the action of a lifting device (7), the positive pole plate (4) can pivot around the pivot (6) to change the relative position of the positive pole plate (4) and the strip steel (1). The invention provides an electroplating zone negative and positive pole gap automatic compensation method of the horizontal electroplating bath, delta automatic compensation can be realized by regulating the tilting device according to gap compensation amount DELTA (delta) = D-delta. The electroplating zone negative and positive pole gap automatic compensation method realizes the real-time compensation of a negative and positive pole gap so as to avoid the direct contact of negative and positive poles, mechanical damages and electrical short circuit and realize smooth running of the electroplating process.

The invention discloses a particulate matter concentration detection device and method. The detection device comprises a measurement unit, a reference correction unit and a controller connected with the measurement unit and the reference correction unit. The measuring unit comprises a light source for emitting laser to the to-be-measured particles and a second optical probe for receiving scatteredlight signals scattered by the to-be-measured dust particles, converting the scattered light signals into dust concentration signals and sending the dust concentration signals to the controller. Thereference correction unit comprises a first optical probe and an optical splitter which is used for dividing the light source into two optical paths. One light beam split by the optical splitter is emitted to dust particles to be detected, and the other light beam is received by the first optical probe, converted into a reference electric signal and sent to the controller. The controller is connected with the first optical probe and the second optical probe and used for receiving the reference electric signal and the dust concentration signal and obtaining a dust particle concentration signalthrough the reference electric signal and the dust concentration signal.

The invention relates to a laser and video real-time coaxial correction system and method. The system comprises a laser optical axis monitoring unit, a video unit, a spectroscope unit, a laser opticalaxis correction unit and a control unit. The video unit images a target video; one part of the laser is emitted after passing through the spectroscope unit, the other part of the laser enters the laser optical axis monitoring unit, and the laser optical axis monitoring unit calculates a real-time deviation value between an optical axis of the laser and a position of a laser optical axis adjustingorigin; the control unit calculates the deviation value between the real-time position of the optical axis of the laser and the position of the laser optical axis adjustment origin, and makes the laser optical axis correction unit adjust the optical axis direction of the laser according to the deviation value. Real-time compensation of a laser emission optical axis and a target tracking optical axis can be realized, a target arrival power of a high-energy laser during target hitting is effectively improved, a data error rate of laser tracking ranging equipment is effectively reduced, and an influence of external vibration and other factors on coaxiality of the optical axis during laser emission is decreased.

The invention discloses a ranging method for real-time compensation of a common link air refractive index. The ranging method comprises the steps that femtosecond pulse fundamental frequency light isgenerated by a femtosecond optical frequency comb and transmitted to a frequency doubling unit, and thus frequency doubling light is generated through the frequency doubling unit; the fundamental frequency light is divided by a beam splitter into two paths of light beams which enter a reference light path and a measurement light path correspondingly, and the frequency doubling light is divided bythe beam splitter into two paths of light beams which enter the reference light path and the measurement light path correspondingly; the repetition frequency of the femtosecond optical frequency combis adjusted, the fundamental frequency light and the frequency doubling light obtain a first rough measuring distance and a second rough measuring distance through a time-of-flight method correspondingly, and the fundamental frequency light and the frequency doubling light obtain first accurate measuring distance and a second accurate measuring distance through an interference method correspondingly; and dispersion scale factors of the fundamental frequency light and the frequency doubling light are calculated, and the compensation distance of air refractive index compensation is calculated and obtained according to the first accurate measuring distance and the second accurate measuring distance. According to the ranging method, the influence of the air refractive index on the ranging precision is solved by measuring the optical distance corresponding to the two wavelengths.

The invention discloses a high-precision surface type measuring system, belongs to the technical field of high-precision surface type measuring instruments, and solves the problem that a surface type measuring system in the prior art is difficult to realize nanoscale surface type precision measurement on irregular curved surfaces such as spherical surfaces, aspheric surfaces and free-form surfaces. The system comprises a real-time feedback system, a motion scanning system, a real-time positioning laser system, a rotating table and a supporting frame, the rotating table, the real-time feedback system and the motion scanning system are all installed on the supporting frame, the real-time positioning laser system is installed on the motion scanning system, and the real-time positioning laser system comprises a rotating shaft. A spectrum confocal measuring head is installed on the rotating shaft, the motion scanning system comprises an X-direction kinematic pair, a Z-direction kinematic pair is installed on the X-direction kinematic pair, the rotating shaft is installed on the Z-direction kinematic pair through an installation support, and a laser displacement sensor is installed on the installation support. The system is used for high-precision surface type measurement of the workpiece, the measurement error is small, and the influence of the environment is small.