28results about How to "Guaranteed Calibration Accuracy" patented technology

The invention discloses a phase-locked loop rapid frequency automatic calibration system, which relates to the technical field of digital circuits and comprises an input signal selector, a voltage-controlled oscillator, an eight-frequency-division eight-phase circuit and an automatic frequency calibration circuit. According to the invention, the eight-frequency-division eight-phase output clock is used as the VCO output calibration clock, so that the AFC calibration time can be shortened to 1 / 7 of the traditional AFC time under the same calibration precision under the condition that a low-speed clock meeting the constraint condition of a digital circuit is used.

The application discloses a kind of calibration devices for strapdown inertial measurement unit, solve the technical problems of the prior art, such as large size and weight of calibration tool, poor stability, which affects the final test accuracy, and the need to replace the turntable with larger volume and load for overturning calibration, leading to increased resource costs, comprising a calibration bracket, four calibration bracket package angles and a positioning locking device.The calibration bracket is fixedly connected to the inertial measurement unit body through the positioning locking device.The calibration bracket is fixed on the inertial measurement unit body through the positioning locking device, achieving miniaturization design, reducing the weight of the calibration device by about 90%, reducing the volume by about 40%, and greatly saving the resource cost and labor cost of strapdown inertial measurement unit calibration work.

A surface thermometer calibration device comprises a calibration box, a heat conduction block is arranged in the calibration box, an isothermal block is arranged above the heat conduction block, a plurality of temperature measuring holes are formed in the isothermal block, a supporting plate is fixedly connected to one side of the upper side wall of the calibration box, a first sliding groove is formed in the supporting plate, and a lifting block is slidably connected into the first sliding groove; and a screw rod is rotationally connected to the lower side wall of the first sliding groove, a thread at the upper end of the screw rod passes through the lifting block, extends to the position above the supporting plate and is fixedly connected with a first rotating button, a follow-up plate is fixedly connected to the lifting block, a clamping assembly is arranged on the follow-up plate, and a leveling assembly is further arranged on the supporting plate. Compared with the prior art, the surface thermometer leveling device has the advantages that probes of various surface thermometers can be fixed through the clamping assembly, the applicability is high, the surface thermometer leveling device is more practical, the probes of the surface thermometers placed on the placing plate can be leveled in batches through the leveling assembly, the leveling mode is convenient and rapid, the working efficiency is improved, and the working efficiency is improved. And the calibration precision is ensured.

The application relates to the technical field of machine vision, and provides a non-overlapping field of view multi-camera calibration method based on a global camera, which comprises the following steps: arranging a global camera, device cameras and a calibration board; the global camera photographs the calibration board, and initial single-camera internal parameter calibration of the global camera and pose estimation between the global camera and the calibration board are completed; each device camera respectively solves the internal parameter of each device camera based on the photographed calibration board image, and initial single-camera internal parameter calibration of each device camera and pose estimation between each device camera and the calibration board are completed; the initial transformation relationship of each device camera relative to the global camera is calculated, and initial external parameters are obtained; a nonlinear optimization method is used to optimize the process parameters of each initial internal parameter and the derived initial external parameters, and a calibration result is obtained. The non-overlapping field of view calibration problem is converted into a classical overlapping field of view calibration problem by introducing the global camera as a bridge intermediary, and the dependence of a special device in the traditional method is effectively avoided.

The invention discloses an integrated centrifugal PCR (polymerase chain reaction) fluid verification and calibration module, and relates to the technical field of calibration of centrifugal microfluidic PCR devices. Comprising a module main body, the module main body is installed on an output shaft of a centrifugal driving mechanism of the centrifugal microfluidic PCR device, and the module main body is formed by positioning, overlapping and connecting a top layer PCB, a fluid verification chip, a calibration chip and a bottom layer PCB in sequence; a four-probe temperature detection unit, a pressure detection unit, a fluorescence simulation unit, a fluid verification unit, a control unit and a battery are integrated on the module main body. Power can be stably supplied under the centrifugal working condition, temperature, pressure and fluorescence parameter calibration and runner fluid function verification are synchronously completed, and a reliable technical scheme is provided for accurate and efficient calibration of a PCR device.

The invention provides a camera dynamic calibration method and device and a vehicle, and the method comprises the steps: in a data preparation stage, based on a road environment image collected by a target camera in a vehicle in a vehicle driving process, obtaining target data needing to be provided in the data preparation stage, the target data comprising a first feature point set, and in a camera calibration stage, the target data comprising a second feature point set; the second feature point set needed to be used in the camera calibration stage is obtained based on the target data, the external parameter calibration result of the target camera is determined based on the second feature point set, the second feature point set comprises the first feature point set, a calibration plate and an artificial marker do not need to be used in the whole calibration process, and the calibration efficiency of the target camera is greatly improved; meanwhile, according to the method, different feature point sets can be respectively obtained in different stages of dynamic calibration of the target camera according to calibration requirements, so that the calibration precision of the target camera can be effectively ensured.

The present application relates to dilution refrigerator temperature calibration technical field, and disclose a kind of dilution refrigerator thermometer in situ calibration system based on natural cooling dynamics, comprising: according to the dynamics equation of cooling power and temperature Curvature is calculated, according to the temperature corresponding to thermometer resistance value, the temperature is substituted into temperature curvature, and the calibration function of resistance value and temperature is obtained;Identify the multivalued region of temperature, and evolve multiple branch functions in multivalued region in calibration function, calculate the deviation measure of each branch function and calibration function;In multivalued region, the support degree of each branch function to calibration function is calculated, and real-time data is obtained by adjusting calculation load, to minimize the number of experiments to verify calibration function;According to the branch verification result of multivalued region, dynamically adjust the verification strategy of non-multivalued region, under the premise of not relaxing calibration accuracy, through dynamics branch and load guide, significantly reduce the repeated experiment cost of dilution refrigerator cryogenic calibration.

The invention discloses an internal reference calibration method of a catadioptric camera based on principal line properties, and belongs to the technical field of computer vision and machine vision calibration, and the method comprises the following steps: S1, obtaining four antipodal image points in each image; s2, obtaining two groups of orthogonal vanishing points in each image; s3, constructing a main line based on the vanishing points and estimating a camera main point; s4, screening bad images; and S5, determining the focal length of the camera. According to the internal reference calibration method of the catadioptric camera based on the main line property, the problems that an existing internal reference calibration method of the catadioptric camera depends on a mirror surface geometric model, a complex calibration structure or high-precision feature detection, the robustness is insufficient, and operation is tedious are solved.

The invention relates to the technical field of precision measurement, in particular to a magnetic type rapid calibration and precision measurement reference block. Comprising a reference block body with a non-magnetic property; the upper end face of the reference block body is engraved with scale marks, and the lower end face is plated with a composite magnetic conductive coating. The reference block body is provided with at least one compensation positioning mechanism for adjusting the levelness of the contact surface of the reference block body; when the reference block is in a magnetic attraction state, the compensation positioning mechanism can provide magnetic attraction reverse force and friction force for the pre-positioned reference block. Through the composite design of the non-magnetic-conductive high-precision ceramic reference block and the low-hysteresis magnetic-conductive coating, while the stress magnetic attraction positioning of the reference block is precisely measured, the conduction of a magnetic field to a laser interference measurement area is blocked, the interference of the magnetic field on laser coherence and a measurement light path is eliminated, and the calibration precision is guaranteed. The method is suitable for the scenes of contact type laser interferometer gauge block calibration, high-precision flatness calibration and the like.

This utility model belongs to the field of rail base material testing technology, and provides a calibration rail for laser intelligent testing equipment for welded rail base materials. The calibration rail includes: a calibration rail with scale lines at both ends; and an adjustment mechanism comprising two base plates, each with omnidirectional wheels movably mounted on its bottom and an adjustment frame fixedly mounted on its top. A support plate is movably mounted inside the adjustment frame, and the support plate is connected to the calibration rail by bolts. The calibration rail of this utility model consists of two mutually perpendicular rectangular blocks, replacing the complex curves of the rail, fundamentally solving the problem of inaccurate measurement of complex rail curves. Traditional testing methods suffer from large measurement errors when dealing with complex rail curves because standard measuring tools cannot perfectly fit them. The simple geometry of the calibration rail allows laser testing to more accurately capture dimensional information, greatly improving measurement accuracy.

The application discloses a six-axis industrial robot hand-eye calibration method based on a three-dimensional ball calibrator and belongs to the technical field of six-axis industrial robot vision. The three-dimensional ball calibrator comprises a bottom plate, 11 standard balls and 11 standard rods, a plane coordinate system is arranged on the bottom plate, the 11 standard balls are respectively arranged on the bottom plate 12 in a vertical manner through the 11 standard rods according to the projection position coordinates and the height, and a space distribution is formed. The calibration method is used for determining the pose relationship between the end effector of the six-axis industrial robot and the camera, converting the position coordinates recognized by the vision system into the coordinates in the base coordinate system of the six-axis industrial robot, and thus ensuring that the six-axis industrial robot can accurately grasp the target object according to the information recognized by the vision system. The application improves the accuracy of the hand-eye calibration from two aspects: one is that the camera pose can be accurately obtained through the three-dimensional ball calibrator, which lays a foundation for accurate operation; and the other is that the calibration precision is further improved through the hand-eye equation AX=XB.

The present application relates to a calibration method, device, system and storage medium for a radio astronomy phased array feed, which obtains a multi-channel receiving signal output by a phased array feed; wherein the multi-channel receiving signal is generated after a first noise signal is radiated from the transmitting antenna to a plurality of receiving units of the phased array feed; each of the receiving signals and a reference signal are converted into an analog-to-digital format to generate a corresponding two-dimensional digital matrix; wherein the reference signal is a second noise signal having the same source as the first noise signal; based on each of the two-dimensional digital matrices, a covariance matrix of signals between different receiving links of the phased array feed is determined; based on the covariance matrix, an original beamforming coefficient matrix of the phased array feed is calibrated to obtain a corrected beamforming coefficient matrix of the phased array feed, thereby reducing the frequency of using astronomical sources for calibration and improving the system calibration efficiency under the premise of ensuring the calibration accuracy of the phased array feed.

The invention discloses a calibration method and system for a pressure sensor, and the method comprises the steps: selecting a plurality of discrete calibration points on a sensing surface of a multi-layer multi-channel sensor; sequentially applying a group of limited preset acting force modes to each point position, wherein the acting force modes comprise tangential uniaxial force parallel to the sensed surface, normal uniaxial force perpendicular to the sensed surface and at least one composite force simultaneously comprising tangential and normal components; response signals of all channels are synchronously collected during each time of force application; and finally, on the basis of all the signals and the corresponding known force application information, calculating to obtain calibration parameters for establishing accurate mapping between the signals and the actual stress. The problem of low calibration efficiency of the pressure sensor is solved, omnidirectional exhaustion is replaced by finite mode test, the calibration precision is guaranteed, the test frequency and time are greatly reduced, and the calibration efficiency of the pressure sensor is remarkably improved.

The present application relates to the technical field of battery management, and particularly relates to a battery power calibration method and device based on a gating state, equipment and a storage medium, the method obtains power prediction parameters and state parameters of a battery, calculates power estimation results and their credibility, dynamically adjusts the gating state in combination with static state, voltage stability and other determination conditions, and finally selects a corresponding correction algorithm to calibrate the power according to the gating state. By introducing the gating state mechanism, the power calibration process can flexibly switch the correction strategy according to the actual running state of the battery: in the static stable stage, the credibility weight is increased to ensure the calibration accuracy; in the fluctuation stage, the noise influence is reduced to avoid false correction; in the long-time stable stage, the result is frozen to reduce invalid calculation. The method determines the credibility by fusing multiple parameters, and adopts the appropriate correction strategy in different gating states, thereby improving the accuracy of power estimation.

The camera optical axis calibration device of the multi-view stereoscopic vision system comprises a bottom plate, a groove is formed in the top of the bottom plate, a threaded rod is rotatably installed in the groove, one end of the threaded rod penetrates through the bottom plate and is fixedly connected with a rotating disc, and the other end of the threaded rod is fixedly connected with a rotating shaft. A locking assembly used for locking the threaded rod is arranged on one side of the bottom plate, sliding blocks are in threaded connection with the outer walls of the two ends of the threaded rod, the threaded rod is driven to rotate by rotating a rotating disc, then the two sets of sliding blocks move, the two sets of sliding blocks drive a moving plate to move, and the position of the moving plate is adjusted. According to the optical axis calibrator, the optical axis calibrator is arranged, the sliding plate can move through cooperation of two sets of T-shaped sliding grooves and four sets of moving blocks, then the position of the optical axis calibrator is changed, a locking assembly is arranged, a locking head and a locking gear are matched, a threaded rod can be prevented from rotating, the position of the optical axis calibrator can be prevented from deviating, and the calibration precision is guaranteed.

The utility model relates to switch installation technical field discloses a kind of infrared photoelectric switch magnetic attraction type quick positioning device of platform scale, including shell, the both sides of shell are fixedly connected with magnetic attraction pedestal, the front end of shell is fixedly connected with visible light infrared coaxial cross line emission head, the top of shell is equipped with double-shaft bubble level, the front end of visible light infrared coaxial cross line emission head is fixedly connected with mounting ring, the outer wall of visible light infrared coaxial cross line emission head is slidably connected with sunshade, the both sides inside sunshade are fixedly connected with a plurality of first magnetic attraction piece. In the utility model, realize quick installation and disassembly by magnetic attraction pedestal, shorten debugging time;Visible light beam is projected by using built-in cross line emission head to assist centering calibration, and combined with top double-shaft bubble level to provide horizontal reference, ensure calibration accuracy. Magnetic attraction fixation is combined with multi-direction calibration, improve debugging efficiency and positioning accuracy.

The invention relates to the technical field of array power amplifier attenuation calibration, and provides an array power amplifier attenuation calibration system and method.The system comprises a signal source, a multi-channel attenuation array, a multiplexer, a frequency spectrograph and an upper computer which are connected in sequence; the signal source, the array power amplifier, the multi-channel attenuation array, the multiplexer and the frequency spectrograph are connected in sequence; the signal source, the array power amplifier and the frequency spectrograph are all connected with the upper computer; the signal source is used for generating an excitation signal of the array power amplifier; the multi-channel attenuation array is used for attenuating an output signal of the array power amplifier; the multi-path synthesizer is used for synthesizing the multi-path signals attenuated by the multi-channel attenuation array into one path of synthesized signal; the frequency spectrograph is used for measuring a synthesized signal of the multi-path synthesizer; and the upper computer is used for managing the signal source, the array power amplifier and the spectrum analyzer, predicting a calibration table of each channel of the array power amplifier based on a measurement value of the spectrum analyzer, and burning the calibration table into the array power amplifier. According to the invention, the calibration efficiency can be greatly improved on the premise of ensuring the single-channel calibration precision.

The invention provides a high-speed comparator offset front-end self-calibration circuit, and belongs to the technical field of analog-to-digital converter circuits in integrated circuit design. The self-calibration circuit comprises a calibration logic circuit, a calibration voltage generation circuit, a back gate bias of a comparator differential input geminate transistor and a comparator. Wherein the comparator and the back gate bias of the comparator differential input geminate transistor are constituent parts of the ADC circuit; and the calibration voltage generation circuit comprises a p-end calibration voltage generation circuit and an n-end calibration voltage generation circuit, and the two end calibration voltage generation circuits are symmetrical in structure. An original ADC circuit is multiplexed, only a small amount of calibration control logic and a counter are introduced to achieve self-calibration logic, a simple calibration voltage generation circuit is combined, calibration voltage is fed back to a back gate of a comparator differential input geminate transistor, the offset voltage of the comparator is adjusted in an approximation mode through the bulk effect, and the self-calibration logic is achieved. On the premise that the speed of the comparator is not influenced, low cost and high calibration precision are realized.

The present application relates to a calibration method, device, computer equipment, computer-readable storage medium and computer program product for a chip mounting device. The method comprises: obtaining a first image corresponding to a first identifier and a second image corresponding to a second identifier; determining first coordinate data of the first identifier and second coordinate data of the second identifier according to the first image and the second image; determining a position deviation value between the first identifier and the second identifier according to the first coordinate data and the second coordinate data; determining error values ​​of the multiple dimensions corresponding to the position deviation value based on the correlation between the position deviation value and the error values ​​of multiple dimensions; calibrating the position of the mounting head and / or the carrier according to the error value to obtain a calibrated chip mounting device. The use of this method can improve calibration accuracy and efficiency.

The utility model provides a clamping device for hub spraying, relates to the technical field of automobile part coating, and aims to solve the problem that the contact area between an existing double-head clamp for clamping a hub and a rim is large. The clamping device for hub spraying comprises a plurality of clamping assemblies arranged in the circumferential direction of a hub at intervals, each clamping assembly comprises a clamping disc, each clamping disc comprises a disc body and a tooth-shaped part arranged on the periphery of the disc body, the clamping discs abut against a rim of the hub through the tooth-shaped parts, and the clamping assemblies are arranged in the axial direction of the hub. The positions of the clamping discs of the multiple clamping assemblies are the same. According to the clamping device, the contact area between the clamping disc and the rim is reduced, so that the clamping device can be suitable for spraying operation of hubs of various sizes, and the powder sticking defect cannot be generated in the spraying operation process.

The present application relates to the technical field of laser, and discloses a green laser temperature point calibration method, system, device and electronic equipment, the method comprises the following steps: obtaining the real-time green laser power of a frequency doubling crystal; based on the real-time green laser power, a power trend value and a corresponding reliability index are obtained by analysis, and then the temperature adjustment direction and the temperature adjustment step are determined; the temperature point of the frequency doubling crystal is adjusted according to the temperature adjustment direction and the temperature adjustment step, and the starting time of the next round of real-time green laser power acquisition after the adjustment is completed is earlier than the time when the frequency doubling crystal temperature reaches a stable state; the step of obtaining the real-time green laser power of the frequency doubling crystal is executed until the preset convergence condition is met, and the current temperature point is determined as the calibrated optimal temperature point, the present application dynamically adjusts the adjustment step and direction through power trend judgment and power size comparison, and skips or shortens the delay waiting, so as to realize fast approximation to the optimal temperature point.

The utility model relates to a switching device for low gas pressure test box calibration, including standard pressure gauge connector, its characterized is still including connecting assembly, the standard pressure gauge connector is tubular thread structure, and the standard pressure gauge connector includes standard pressure gauge interface end and pressure signal import end, and the pressure signal import end is internal thread, and the connecting assembly includes support pipe and conical hose, and the support pipe is the whole structure formed by external thread pipe and hollow rotator, and the external thread pipe is connected through thread cooperation with the pressure signal import end, and the conical hose includes big head and small head, and the big head is sleeved on the hollow rotator, and the small head is low gas pressure test box test port, the utility model discloses adopt conical hose as low gas pressure test box test port, can cooperate with the interface of different structure forms and different sizes of low gas pressure test box, and can effectively prevent the leakage to guarantee the calibration accuracy, the utility model discloses reasonable structure, easy operation, connection fast reliable and excellent sealing performance.

The invention discloses a door and window curtain wall pipeline collision early warning and precise installation adjusting method and system, and belongs to the technical field of building construction intellectualization. The method comprises the steps of collecting real-time installation data of door and window curtain wall pipelines and generating a collision feature data set; determining an initial collision parameter based on a preset BIM collision model; acquiring real-time deviation information by setting a first monitoring point group and a second monitoring point group, and performing adaptive optimization on initial collision parameters by using a normalized weight deviation formula; and dividing dynamic segments based on the optimized parameters, dynamically adjusting the adjusting parameters by adopting a fuzzy control algorithm, and generating stability information based on the installation error variance and the collision conversion precision fluctuation ratio. The problem that the model and the construction state are disjointed in the traditional installation process is solved, high-precision collision early warning and intelligent adjustment in the door and window curtain wall pipeline installation process are achieved through the self-adaptive optimization algorithm and dynamic stability evaluation, and the construction safety and the installation precision are remarkably improved.

The utility model discloses a kind of robot rapid calibration device, it is related to robot calibration technical field.The purpose is to solve the problem that the existing robot rapid calibration device relies on laser tracker, three-dimensional scanner and other precision equipment, leading to high cost and high maintenance cost.The device includes pedestal, target piece and detection component;Pedestal is equipped with adjustable fixing structure to fix different models of robot;Target piece is installed on robot end effector;Detection component contains at least two fixed cameras around pedestal, for shooting target piece image.The utility model uses camera to replace precision equipment, reduce cost, and simple structure, maintenance is convenient, with good practicability.

The present application relates to the technical fields of wellbore monitoring, in particular to a full-travel monitoring device for a coal mine wellbore, comprising a cage, the side wall of the cage is provided with a deviation detection mechanism, the inside center of the cage is provided with a counterweight correction mechanism; the deviation detection mechanism comprises a plurality of fixed sleeves fixedly connected to the side wall of the cage, the top and bottom inside of the fixed sleeve are provided with a first rotating shaft, the outside of the first rotating shaft is rotatably provided with a first limiting wheel, the front and back sides of the first rotating shaft are provided with inclined guide rails; the counterweight correction mechanism comprises an elliptical rail arranged in the inside center of the cage. The present application realizes real-time detection of the deviation angle during the downward movement of the cage through the deviation detection mechanism, and when the cage is tilted and deviated, the first limiting wheel is driven to tilt and slide along the inside of the inclined guide rail, and then the conductive contact patch and the conductive block are in contact and powered on, achieving accurate detection of the tilt angle, improving the response speed of the operation room, and effectively reducing the risk.

The present invention discloses a current calibration measurement method and related device of a current transformer, and relates to the technical field of data processing. The method comprises: preprocessing operation and maintenance information, power data and temperature time series data; performing harmonic analysis based on the power data to obtain target harmonic analysis data; performing temperature influence change analysis based on the target harmonic analysis data using the temperature time series data to generate calibration parameters; performing magnetic field interference analysis based on the operation and maintenance information to build an error analysis model in combination with the power data, and generating a first error compensation value based on the error analysis model and the temperature influence change data; determining loss data based on the operation and maintenance information to determine a second error compensation value, and generating a target error compensation value based on the first and second error compensation values; and controlling the current transformer to perform current calibration measurement based on the calibration parameters and the target error compensation value. The present invention improves the measurement accuracy of the current transformer and makes the obtained current measurement result more reliable.

This disclosure relates to a device calibration method, apparatus, device, and medium. The method includes: acquiring inertial sensor data from the device; calculating accelerometer calibration parameters based on accelerometer data from the inertial sensor data; calculating gyroscope calibration parameters based on gyroscope data from the inertial sensor data; and calibrating the current inertial sensor data acquired by the device based on the accelerometer calibration parameters and the gyroscope calibration parameters, respectively. This combines accelerometer and gyroscope calibration, reducing calibration time, improving device calibration efficiency, lowering costs, and ensuring calibration accuracy.

The invention relates to the technical field of computer vision, and particularly discloses a camera array image stitching calibration method for a long focal length and a large field of view, and the calibration method comprises the steps: calibrating a panoramic camera, so as to obtain a calibrated panoramic camera; respectively shooting a target object by using a plurality of detail cameras and the calibrated panoramic camera to obtain a plurality of detail images and a panoramic image; projecting a plurality of detail images into the panoramic image to obtain a projected panoramic image; and adjusting each detail image in the projected panoramic image to obtain an adjusted panoramic image. According to the camera array image splicing calibration method for the long focal length and the large view field, large-scene image calibration is carried out without depending on a calibration plate, errors caused by calibration of a non-calibration plate are reduced through iteration, the calibration cost is reduced, and the calibration accuracy is guaranteed.