8826 results about "Measuring instrument" patented technology

The invention discloses an indoor water tank sediment starting speed measurement system and method, and aims to solve the technical problem that data accuracy is affected due to the fact that a sensor disturbs a flow field in an existing measurement method. The core of the technical scheme is that the non-contact measurement characteristic of the PIV technology is applied to the whole process from flow field construction to data acquisition. The device is mainly composed of an imaging unit, a laser lighting unit, a movable sliding frame, a water flow adjusting unit and a buffer plate. Optical measurement is carried out through the imaging unit and the laser illumination unit, a physical sensor does not need to be arranged in a flow field, and interference of a measuring instrument on a water flow structure and a sediment starting process is fundamentally avoided. The movable sliding frame which is integrally designed integrates the functions of sediment laying, particle throwing and measuring, so that a test area can be quickly positioned; and the buffer plate and the water inlet and drainage adjusting unit are combined, so that a gradually-changed flow field from weak to strong can be accurately and stably simulated.

The invention relates to the technical field of laser measuring equipment, and discloses laser length measuring equipment for caution light production, which comprises a supporting seat, a rotating table rotationally mounted at the top end of the supporting seat, a laser measuring instrument arranged above the rotating table and a plurality of fixing assemblies arranged on the rotating table, a driving mechanism for driving the rotating table to rotate is arranged on the rotating table; through meshing arrangement of a first bevel gear and a second bevel gear in the synchronous driving assembly and a threaded transmission structure of a driving screw rod and a sliding block, synchronous movement of a clamping plate driven by a plurality of vertical plates is achieved, it is ensured that a warning lamp cover is accurately positioned to the axis position of the detection table, and the detection efficiency is improved. Therefore, the laser measuring instrument can accurately irradiate the center position of the top end of the lampshade, the problem of large measurement data deviation caused by insufficient positioning precision in the prior art is effectively solved, and the detection precision is remarkably improved.

The invention discloses a low-cost dual-drive self-calibration dust concentration on-line monitoring system and a monitoring method. According to the system, a dust concentration monitoring assembly comprises an oscillating balance dust continuous tester and a plurality of low-cost dust monitors; the coal mine information processing center is respectively connected with the oscillating balance dust continuous tester and the low-cost dust monitor; the visual client is connected with the central processor through a third communication module. The method comprises the following steps: carrying out on-line monitoring operation by utilizing multiple groups of dust concentration monitoring assemblies; performing self-calibration on dust concentration data of the low-cost dust monitor by using a physically-driven prediction model; performing secondary real-time calibration on the dust concentration data of the low-cost dust monitor by using a data-driven machine learning calibration model; and generating a mine whole area dust distribution cloud picture by using the mine whole area dust distribution cloud picture unit, and sending the mine whole area dust distribution cloud picture to the visual client for real-time display. According to the system and the method, high-precision monitoring of the dust concentration can be realized on the basis of greatly reducing the monitoring cost.

The invention relates to the technical field of electrical measurement, and discloses an electrical measurement instrument dynamic calibration error compensation method, which comprises the following steps: S1, multi-source data real-time acquisition: integrating a temperature sensor, a humidity sensor and an electromagnetic interference detection module in a measurement instrument, configuring voltage, current, frequency and other measurement channels, and carrying out multi-source data real-time acquisition at the frequency of not less than 100HZ; environmental parameters (temperature T, humidity H and electromagnetic interference intensity E) and measurement data (model characteristic parameters X1, X2,..., Xn such as voltage, current and frequency) are synchronously acquired. According to the electrical measuring instrument dynamic calibration error compensation method, through multi-source data real-time acquisition and composite error model construction, in combination with multiple linear regression and an improved BP neural network, environment and measurement signal changes are comprehensively captured, an error compensation value is accurately calculated, a measurement error can be effectively controlled within an extremely small range, and the error compensation accuracy is improved. Compared with a traditional method, the measurement precision is greatly improved.

The invention discloses a soil heavy metal content estimation method and device, and relates to the technical field of soil heavy metal estimation.The method comprises the steps of sample collection and data acquisition, specifically, based on geographic information of a research area, soil samples are collected through a layered and partitioned sampling method; according to the method, comprehensive and accurate collection and data acquisition of soil samples are realized through a layered and partitioned sampling method in combination with a high-precision positioning and measuring instrument, the sample representativeness and the data accuracy are ensured, and through an improved correlation analysis algorithm and a depth model based on feature fusion, the soil sampling accuracy is improved. Accurate analysis and efficient modeling of correlation between environmental magnetic parameters and heavy metal content are realized, prediction precision is improved, dynamic optimization of model parameters is realized by applying a self-adaptive step length strategy in model verification and optimization, model stability and generalization ability are guaranteed, and all modules of the device work cooperatively, so that the reliability of the device is improved. And deep analysis of heavy metal sources and migration and transformation rules is realized by using a geochemical analysis module and related models.

The invention provides a gas compressor moving blade tip clearance measuring method and device, and belongs to the field of aero-gas turbine gas compressors. The problems of low measurement precision, low measurement efficiency and small measurement range in the prior art are solved. The method comprises the following steps that an angle encoder is installed on a main shaft, and a three-dimensional laser profile measuring instrument is arranged on the blade tip side of a blade at intervals; the impeller is rotated, the three-dimensional laser profile measuring instrument scans the blade tip, and three-dimensional point cloud data of the whole circle of blade tip profile are obtained; after the casing and the impeller are assembled, a plurality of continuous blades on the impeller are detached, and the three-dimensional laser profile measuring instrument is arranged at the vacant position of the impeller; the impeller is rotated, the three-dimensional laser profile measuring instrument scans the inner wall of the casing, and three-dimensional point cloud data of the whole circle of the inner wall of the casing are obtained; processing data; registering the processed three-dimensional point cloud data of the blade tip contour and the processed three-dimensional point cloud data of the inner wall in the same coordinate system to form a registration model; and the blade tip clearance value of the whole circle is calculated. The method is mainly used for measuring the blade tip clearance.

The invention discloses a calibration method for a wind meter, and the method comprises the steps: obtaining the collected environment data in a wind field environment, and the wind power data, outputted by the wind meter, of the wind field environment; comparing the wind power data with preset standard wind power data, and determining an initial compensation coefficient of the wind meter; determining an influence factor corresponding to the environmental data, and determining an environmental compensation parameter according to the influence factor; wherein the influence factor is used for representing a parameter of the influence degree of the environmental data on the output of the wind meter; and obtaining a target compensation coefficient based on the environment compensation coefficient and the initial compensation coefficient, and calibrating the wind meter according to the target compensation coefficient. The problem that the calibration accuracy is low in the calibration process of the wind meter in the prior art is solved.

A test and / or measurement instrument includes at least three ports and at least three measurement circuits connected to the at least three ports, respectively. The test and / or measurement instrument further includes at least one signal generator circuit and a control circuit. The control circuit is configured to set a first calibration mode and carry out a first test of the instrument by measuring the calibration signal travelling from the signal generator circuit to the respective port as well as a signal traveling from the respective port to the signal generator circuit. The control circuit is configured to set a second calibration mode and carry out a second test of the instrument by measuring the calibration signal forwarded only to the main port in the first sub-mode and the calibration signal received by the respective port from the signal generator circuit via the main port in the first sub-mode.

The invention belongs to the technical field of industrial robot body rigidity testing, and particularly relates to a large-load robot transmission rigidity calibration device and method. The device comprises a switching frame, a fixed cross beam, a test torque cross beam, a counterweight mechanism, a measuring instrument, a locking mechanism and a position changing machine, the switching frame is connected with a position changing rotating disc of the position changing machine, a to-be-calibrated robot joint is installed on the switching frame, and an output shaft of the to-be-calibrated robot joint and the position changing rotating disc are coaxial. An input shaft of the to-be-calibrated robot joint is locked through a locking mechanism; the test torque cross beam is connected with an output shaft of a to-be-calibrated robot joint, and counterweight mechanisms are arranged at two ends of the test torque cross beam; the fixed beam is connected to an output end shell of a to-be-calibrated robot joint, the measuring instrument is arranged at one end of the fixed beam, one end of the test torque beam is loaded, the torsion angle of the other end of the test torque beam is measured through the measuring instrument, and therefore rigidity calibration of the robot joint is achieved. The rigidity testing device is simple in structure, capable of effectively controlling rigidity testing errors, accurate in testing result and low in cost.

The invention relates to the technical field of ship construction, and discloses a ship annular block assembly method, which comprises the following steps of: drawing a corresponding ship body center line, a ship body longitudinal section line, a ship body rib detection line and a ship body waterline in an overall design drawing of a ship body according to the actual segmentation condition of the ship body; marking is correspondingly drawn on the built bottom section, the built broadside section and the built transverse bulkhead section in sequence as the basis; a bottom center line, a bottom rib detection line, a broadside longitudinal section line, a broadside rib detection line, a transverse bulkhead center line and a transverse bulkhead rib detection line are used for alignment and adjustment to replace data measurement of closure openings in the prior art so as to achieve alignment and butt joint of the closure openings. The problem that the alignment precision is poor due to the fact that a closing opening data measuring instrument cannot be arranged due to the narrow total assembly site is solved, the total assembly precision is guaranteed, and then the structural strength, water tightness and overall precision of a ship body are guaranteed.

The invention belongs to the technical field of three-coordinate measuring instruments, and particularly relates to a gear three-coordinate measuring instrument which comprises a measuring table, a Y-axis guide rail is installed on one side of the upper end face of the measuring table, a first displacement frame is arranged on the Y-axis guide rail in a sliding mode, an X-axis guide rail is installed on one side of the first displacement frame, and a sliding block is arranged on the X-axis guide rail in a sliding mode. A Z-axis guide rail is installed on one side of the sliding block, a lifting rod is arranged on the Z-axis guide rail in a sliding mode, and a rotating column is rotationally arranged at one end of the lifting rod. By means of the adjustable gear feeding assembly, continuous feeding and measurement of a plurality of gears are achieved. According to the assembly, before the electric clamping jaw conducts clamping, the gears which are originally stacked in a mess are arranged in an ordered state, so that the electric clamping jaw can conduct accurate clamping only by running according to a preset track, and clamping difficulty and errors caused by mess gear stacking are effectively avoided.

The present invention relates to the technical field of inner diameter laser measurement, and specifically to a metal workpiece inner diameter laser measuring instrument, comprising a support frame, a main measuring column is installed through the left interior of the mounting plate, and the upper end of the main measuring column is connected to the output end of the motor above the mounting plate; an air storage airbag is installed in the internal slot of the support frame; a flow channel is opened inside the main measuring column, a circle of upper through holes is opened on the upper outer side surface of the main measuring column, and a circle of lower through holes is opened on the lower outer side surface of the main measuring column. The metal workpiece inner diameter laser measuring instrument is convenient for blowing away dust and impurities on the surface of the first laser ranging component, thereby greatly reducing the amount of dust in the surrounding environment of the first laser ranging component, thereby avoiding a large amount of dust from affecting the optical measurement accuracy of the laser measuring instrument, and thus facilitating the first laser ranging component to measure the inner diameter of the metal workpiece well.

The invention discloses a measuring instrument for measuring the roundness of an inner ring and an outer ring of an automobile hub bearing, and particularly relates to the field of bearing roundness measurement, the measuring instrument comprises a working table, a rotating disc is arranged on the upper surface of the middle of the working table, an adsorption cavity is embedded in the surface of the middle of the working table, and air holes are formed in the surface of the rotating disc; a driving gear is fixedly connected to the outer wall of the middle of the driving shaft, a blade fan shaft is arranged on one side of the inner wall of the adsorption cavity through a bearing, a blade fan gear is fixedly connected to the outer wall of the middle of the blade fan shaft, a spiral blade fan is fixedly connected to the outer wall of the top of the blade fan shaft, and a measurement supporting assembly is arranged on one side of the rotating disc. An auxiliary adjusting assembly is arranged on the side, away from the measurement supporting assembly, of the rotating disc. According to the device, the spiral blade fan can be automatically driven to rotate through the rotation of the rotating disc, so that the workpiece is adsorbed, no mechanical clamping trace exists, the hub bearing workpiece is fixed through the assistance of adsorption force, and the detection stability is improved.

The invention discloses a wafer resistivity detection device and method, and relates to the technical field of detection, the wafer resistivity detection device comprises a probe and a measuring instrument, the lower end of the probe is provided with four probes, an adjusting mechanism comprises an accommodating groove formed in the probe, a sleeve is rotatably connected in the accommodating groove, and the probe is arranged in the sleeve. A first connecting rod close to the probe is fixedly connected to the sleeve, a second connecting rod far away from the probe is rotationally connected to the sleeve, swing rods are hinged to the two ends of the first connecting rod and the two ends of the second connecting rod, a supporting rod is hinged to the free end of each swing rod, and the supporting rods are in sliding connection with the probe. The probes are connected with the corresponding supporting rods in a sliding mode, and the conversion mechanism is arranged in the containing groove and used for adjusting the first connecting rod and the second connecting rod to be in a parallel state or a staggered state; the method is suitable for the detection requirement that the distance between the probes needs to be changed frequently, various resistivity measurement requirements are met, and the detection convenience is improved.

The invention relates to the technical field of liquid level measurement, and particularly discloses a liquid level measuring instrument for a low-temperature container and a using method, and the liquid level measuring instrument comprises a gas phase pipe, a liquid phase pipe and a liquid level meter; the part, extending into the low-temperature container, of the liquid phase pipe comprises a straight pipe section arranged in an inner tank of the low-temperature container; the straight pipe section comprises a hole opening section provided with a first exhaust hole and a light pipe section without a hole, and the end of the light pipe section is a closed end. The drainage cylinder is arranged at the top of the side, close to the opening section, of the light pipe section, and the drainage cylinder is communicated with the light pipe section; the flow guide part is arranged in the flow guide cylinder, the width of the flow guide part is gradually increased from bottom to top, and a flow guide cavity is formed between the flow guide part and the flow guide cylinder; the sealing section is arranged on the side wall of the inner tank in a penetrating manner; one end of the sealing section is connected with the tapping section; the U-shaped air sealing section is arranged in the vacuum interlayer of the low-temperature container, one end is connected with the other end of the sealing section, and the other end is connected with the heating section. The accuracy and the stability of the differential pressure type liquid level instrument used for liquid level measurement of the low-temperature container can be improved.

The invention discloses a multi-discharge efficient precision machining device and method for a milling cutter. The multi-discharge efficient precision machining device comprises a high-precision machining tool, an electric spark machining pulse power supply, a discharge monitoring device and a detection device. The high-precision machining machine tool comprises an electric spark machining machine tool, a spindle, a grinding wheel, a workbench and a machine tool body. The main shaft supports accurate movement in three directions; stable and controllable pulse current and voltage are output through the electric spark machining pulse power supply; a voltage probe and a current probe are arranged on the discharge monitoring device, and discharge voltage and current data are collected in real time through the voltage probe and the current probe; the detection device comprises a non-contact optical measuring instrument, the abrasion of the grinding wheel is monitored through the non-contact optical measuring instrument, meanwhile, the machining allowance of the milling cutter blank placed on the workbench and the size precision after finish machining are measured, and the surface quality of the milling cutter is detected; the machining precision and efficiency of the milling cutter are improved, and efficient precision machining of the milling cutter is achieved.

The invention relates to the technical field of building board detection, and discloses a building board surface flatness detection device and method.The device comprises a bottom plate, a board body and a laser measuring instrument, and further comprises an upper plate fixedly connected to the upper portion of one side of the front face of a back plate, a measuring assembly is arranged at the bottom of the upper plate; the positioning assembly is arranged in the middle of the top of the bottom plate; the measuring assembly comprises mounting plates which are symmetrically arranged, a motor is fixedly mounted on the inner side of one mounting plate, the output end of the motor is fixedly connected with a threaded rod, and the outer side of the threaded rod is in threaded connection with a mounting seat; and the positioning assembly comprises a double-end screw rod which is slotted and rotationally mounted in the bottom plate, so that the problem that the measurement precision of subsequent laser detection flatness is possibly influenced and the flatness detection result is inaccurate due to the fact that dust and impurities on the surface of the building board are not cleaned in time is solved.

The invention discloses a roll gap measuring instrument and an integrated continuous casting machine online roll gap measuring device, and aims to improve the precision of roll gap measurement and the convenience of operation. The roll gap measuring instrument comprises a mounting frame and a measuring assembly. The measuring assembly comprises a swing arm, a first elastic piece, a shifting block, a detection piece and a first detector. The swing arm is rotationally connected with the mounting frame, the shifting block is connected with the swing arm, and meshing teeth are arranged on the shifting block. The first detector is installed on the installation frame, the detection piece is in sliding fit with the first detector, and a rack meshed with the meshing teeth is arranged on the detection piece. The first elastic piece is used for driving the detection piece to return to the initial position. When the swing arm drives the shifting block to rotate, the shifting block drives the detection piece to move, the swing amplitude of the swing arm is calculated according to the moving distance of the detection piece, and then the roller gap between the rollers to be measured is obtained. According to the roll gap measuring instrument, through cooperation of the swing arm, the shifting block, the detection piece and the first detector, high-precision measurement of the roll gap is achieved, and the accuracy and reliability of a measurement result are improved.

The invention discloses an indoor water tank sediment pushing characteristic acquisition system and method, the system mainly comprises a water tank main body, a buffer unit, a drainage adjusting unit, a sediment throwing device, an imaging unit, an adjustable support and a data processing unit, and according to the method, non-contact data acquisition is carried out through a high-definition camera and a three-dimensional terrain measuring instrument; automatic identification, parameter extraction and migration speed calculation of landforms such as sand waves are achieved, the sediment bed surface is not touched in the whole process, damage to the bed surface form caused by traditional contact type measurement is eliminated, and the authenticity and reliability of data are ensured. Meanwhile, the buffer design of the combination of the flow slowing plate and the multi-stage water baffle is adopted, the kinetic energy of water flow is effectively dissipated through the graded water outlet structure, the impact force of injected water flow is greatly reduced, the bed surface is prevented from being scoured in the initial water injection stage, and the stability of the initial test condition is powerfully protected.

The present invention is a parameter estimation method for compartment model based on physics-informed neural networks. Starting from a physical model, the method extracts information from an AIF and a small amount of measurement data to obtain kinetic parameters, thereby greatly improving the scanning efficiency of a measuring instrument, and reducing occurrence of inaccurate estimation results due to patient movement. In addition, the present invention has the robustness to AIF noise and measurement data noise, and can flexibly arrange the time of data acquisition, reduce an error of inaccurate estimation caused by long time 10 acquisition and the patient movement, and improve the efficiency of data acquisition of the instrument. Experimental results show that the present invention is more stable and has less errors. Meanwhile, the present invention does not require the setup of training datasets, and is superior to an end-to-end supervised reconstruction method U-net network with fewer samples.

A method for surveying an environment by a movable surveying instrument with a progressional capturing of 2D-images by at least one camera and applying a visual simultaneous location and mapping algorithm (VSLAM) or a visual inertial simultaneous location and mapping algorithm (VISLAM) with a progressional deriving of a sparse evolving point cloud of at least part of the environment, and a progressional deriving of a trajectory of movement. The method comprises a progressional matching of the sparse evolving point cloud with a previously derived 3D-geometry, with a minimizing of a function configured to model a distance between the sparse point cloud and the previously derived 3D-geometry and deriving a spatial localization and orientation of the surveying instrument. At least one surveying measurement value of the environment by a spatial measurement unit is combined with the sparse point cloud or the previously derived 3D-geometry.

The invention provides a laser, inertia and image recognition combined calibration method and system. Comprising the following steps: setting a parameter calibration checkerboard on a marble platform for detection, and leveling the parameter calibration checkerboard; carrying out inertial navigation IMU static parameter calibration and inertial navigation IMU dynamic parameter calibration on the inertial navigation IMU, and correcting an inertial navigation IMU error; irradiating laser spots of a laser into the parameter calibration checkerboard, shooting the parameter calibration checkerboard from different angles through a machine vision camera, and obtaining a parameter calibration checkerboard photo set; and joint calibration of parameters of a machine vision camera, an inertial navigation IMU and a laser is carried out, and automatic correction of external parameters of various precise positioning measuring instruments and high-precision measurement of local space are realized.

The invention discloses a snapshot type broadband full stokes vector measuring instrument and a measuring method, and belongs to the field of micro-nano optics. The snapshot type broadband full stokes vector measuring instrument comprises a wave plate array, a linear polaroid, a light intensity detector and a data processing module; the linear polaroid is installed on the light intensity detector, the wave plate array is installed on the linear polaroid, and the size of the wave plate array is not larger than that of the linear polaroid; and the light intensity detector is electrically connected with the data processing module. The wave plate array is completely arranged on the linear polarizer, the alignment precision during use is reduced, in addition, the small areas of the photosensitive area correspondingly capture light intensity values under different polarization modulations through the wave plate array, calculation inversion can be carried out on the polarization state under single measurement, and the real-time performance of a measurement result is guaranteed. Meanwhile, in combination with the broadband characteristic of the sub-wavelength medium wire grating, the defect that the working bandwidth is limited in the existing full Stokes vector measurement technology is overcome.

The invention belongs to the technical field of test equipment, and discloses a lightning arrester leakage current live-line test device which is technically characterized by comprising a base and a measuring instrument, a lightning arrester body is arranged at the top end of the base, an electric telescopic rod is arranged on the outer side of the base, and a supporting rod is arranged at the telescopic end of the electric telescopic rod; an arc-shaped bearing column is fixedly installed at the top end of the supporting rod, a storage cavity is formed in the bearing column, two sets of oppositely-distributed guide columns are slidably installed in the storage cavity, the bearing column is sleeved with a fixing ring, an induction plate is fixedly installed on the surface of the fixing ring, and a telescopic assembly is arranged in the bearing column; a control mechanism is arranged in the fixing ring, the control mechanism comprises a positioning assembly and a rotating assembly, and the problems that at present, an induction plate can only be located on one side of a lightning arrester for testing, the induction plate cannot conduct all-around testing treatment around the lightning arrester, and the use effect is poor are solved.

The invention discloses a measuring instrument automatic calibration method and system based on big data, and the method comprises the steps: obtaining the multi-dimensional operation data of a measuring instrument in real time through a sensor, and covering the equipment state and environment parameters; processing the data to generate an operation data set, and extracting a fluctuation characteristic value of the quantitative state change by adopting time sequence analysis; when the fluctuation characteristic value exceeds a preset threshold value, triggering depth characteristic decomposition to obtain deviation distribution information; on the basis of the information and in combination with historical records, the optimal calibration opportunity is judged through a machine learning model; and a calibration instruction is automatically generated and issued to the instrument control module to execute calibration. According to the method, the defects that traditional calibration depends on manpower and is not accurate in time are overcome, intelligent and automatic calibration based on the real state is achieved, the calibration precision and efficiency are remarkably improved, and the adaptability and robustness of the system in the complex environment are enhanced.

The invention relates to the technical field of electric energy metering monitoring, in particular to an electric energy metering online monitoring method based on adaptive filtering and a deep convolutional neural network. According to the technical scheme, the method comprises the following steps: based on monitoring of correlation between electrical parameters and equipment characteristics, carrying out preliminary correlation analysis by using an intelligent algorithm according to electrical parameters, mutual inductor characteristics and electrical topological structure information collected by an electric energy metering device, and then carrying out global optimization algorithm processing. Noise interference in data is effectively removed through the adaptive filtering technology, the data quality is improved, a reliable data basis is provided for subsequent analysis and model training, the accuracy of a monitoring result is improved, high-precision description of errors of a measuring instrument is achieved, the precision of online monitoring of electric energy measurement is remarkably improved, and the method is suitable for popularization and application. Potential problems of the measuring instrument can be found in time, electric power transaction disputes and power grid operation risks caused by measuring errors are reduced, and stable operation and economic operation of an electric power system are guaranteed.

The invention provides a surface thermometer calibration system. The surface thermometer calibration system comprises a surface heat source device, a control host, a temperature control thermometer, a reference surface thermometer and a standard thermometer, the surface heat source device comprises a glass cover, a constant-temperature disc heat source, an upper protection structure, an adjustable support and a cooling fan. The control host comprises a dual-channel high-precision thermodetector, a dual-channel program-controlled output voltage-stabilized power supply and a control module, and the control module is used for obtaining measurement results of the temperature control thermometer, the reference surface thermometer and the standard thermometer and dynamically adjusting the output voltage of the dual-channel program-controlled output voltage-stabilized power supply according to the measurement results. Temperature control of the constant-temperature disc heat source is achieved. According to the surface thermometer calibration system designed and developed by the invention, the reliability and the calibration efficiency of surface thermometer calibration can be remarkably improved, and the reliability of surface temperature value traceability is ensured.

The invention discloses a construction method and device for controlling the perpendicularity of a high pier, and belongs to the technical field of bridge engineering construction. Determining a plumb aligner control point; mounting a creeping formwork bracket; installing a laser target; correcting and installing an inclination measuring instrument; centering the point position of the laser plumb aligner; measuring a deviation value between the laser beam and the pier body; collecting data of an inclination measuring instrument; and pier body concrete is poured. According to the method, through triple measurement rechecking and chemical deviation calculation, the perpendicularity control precision and efficiency of high pier construction are remarkably improved, and the method is suitable for high pier construction in a complex environment.

The invention discloses an online monitoring method for abnormal operation of a voltage transformer, and the method comprises the steps: firstly collecting the secondary side voltage data of a CVT in real time, forming a time sequence, building a bilateral sliding window with a to-be-measured point as a center, and sliding along a time axis to cover a complete sequence; then, K-Means clustering initialization is executed on each sliding window, the clustering number K is set to be equal to 2, two initial centroids are randomly selected, and the distance between each piece of voltage data and the two centroids is calculated; thirdly, dividing the voltage value in the window into the closest centroid category, and recalculating a new centroid until the position of the centroid is stable or reaches the maximum number of iterations; and finally, calculating a current window clustering centroid distance in real time, comparing the current window clustering centroid distance with a dynamic threshold value obtained by historical data training, and judging whether the CVT has an internal fault or not. The method utilizes the existing voltage data, does not need an additional measuring instrument, can adapt to different operation conditions, avoids the over-alarm problem of a traditional fixed threshold value method, and improves the accuracy and robustness of fault diagnosis.

The invention relates to the technical field of liquid level meters, in particular to a liquid level measuring instrument for a low-temperature and high-pressure container, and aims to solve the problem that when the liquid level of the low-temperature and high-pressure container is measured, measured data are easy to be wrong due to the influence of the pressure and temperature of a medium. Comprising a pressure measuring container; the liquid level meter comprises a gas phase pipe, a liquid phase pipe and a differential pressure transmitter, and one end of the gas phase pipe and one end of the liquid phase pipe are both communicated with the pressure measuring container; a gas-liquid drainage assembly; the differential pressure transmitter is used for measuring the liquid level in the pressure measuring container through the pressure of gas or liquid in the gas phase pipe and the liquid phase pipe, and the gas-liquid drainage assembly is used for separating gas and liquid in the gas phase pipe or the liquid phase pipe. The gas in the low-temperature and high-pressure container enters the gas phase pipe, the liquid in the low-temperature and high-pressure container enters the liquid phase pipe, the gas-liquid drainage assembly can treat media at the gas phase pipe and the liquid phase pipe respectively, and the problem that the media directly enter the gas phase pipe or the liquid phase pipe, and measurement data are unstable due to factors such as pressure fluctuation is solved.