71 results about "Total measurement" patented technology

The invention discloses a temperature influence compensation method and system in a passive bolt monitoring system, and belongs to the technical field of structural health monitoring, and the method comprises the steps: obtaining a resonant frequency signal of a passive bolt monitoring sensor and temperature data, collected by a preset distributed temperature sensing network, of a plurality of monitoring points; reconstructing a two-dimensional temperature field cloud picture of the bolt connection area through interpolation calculation; extracting an equivalent comprehensive temperature rise value from the temperature field distribution, and performing preliminary compensation on the resonant frequency signal to generate a preliminary strain value; calculating a virtual thermal strain value generated by temperature influence; and performing decoupling operation on the initial strain value based on the virtual thermal strain value to obtain a compensated real mechanical strain value, and accurately separating the real mechanical strain from the total measurement strain by adopting a method of reconstructing a two-dimensional temperature field of a bolt connection area and calculating a decoupling virtual thermal strain by utilizing a finite element analysis micro-simulation model. Therefore, the accuracy and reliability of bolt pre-tightening force monitoring are improved.

The invention relates to the field of performance testing of high-precision fiber-optic gyroscopes, and discloses an automatic testing method and system for the extinction ratio of a high-precision fiber-optic gyroscope, and the method comprises the following steps: constructing a signal light path and a reference light path, and combining the output light of the signal light path and the reference light path into a combined light signal in an orthogonal polarization state; integrally measuring the extinction ratio of the combined optical signal by using an extinction ratio tester to obtain a measured value; the control unit compares the measured value with a target value of 0dB and generates a control instruction based on a difference value; the voltage controller automatically adjusts the voltage of the integrated optical modulator in the signal light path according to the instruction, and iterative optimization is carried out through closed-loop feedback until the actually measured extinction ratio reaches a target value; and finally recording and solidifying the optimal voltage value. According to the invention, single and accurate extinction ratio overall measurement is used for replacing two times of error-prone independent optical power measurement, full-automatic closed-loop control is realized, the precision, efficiency and consistency of optical power balance are remarkably improved, and the skill requirements on operators are reduced.

The invention provides a fault diagnosis method, device and equipment for a high-precision wide-range electric energy meter, and relates to the technical field of fault diagnosis. The method comprises the following steps: acquiring measurement error data of the electric energy meter under various test conditions; wherein each test condition comprises a changing electromagnetic environment condition and a temperature condition; based on the weight of each test condition, performing weighted fusion on the measurement error data to obtain comprehensive error data of the electric energy meter; if the comprehensive error data is not in the credible interval, determining that the electric energy meter has an integral fault, analyzing the source and contribution degree of the comprehensive error data based on an uncertainty evaluation model, and determining a fault component; wherein the uncertainty evaluation model is used for representing the contribution relation of each error source item to the total measurement uncertainty. According to the invention, comprehensive, accurate and efficient fault diagnosis of the high-precision wide-range electric energy meter can be realized, and the reliability and accuracy of electric power metering are guaranteed.

The invention discloses a cascade cooperative measurement method for electromagnetic ultrasonic thickness measurement modules, which is characterized by comprising the following steps of: (1) forming a cascade measurement system by adopting a plurality of electromagnetic ultrasonic thickness measurement modules, and connecting the modules through cascade interfaces, the electromagnetic ultrasonic thickness measuring modules are sequentially defined as a first channel module, a second channel module,..., and an nth channel module along a cascade sequence; (2) the channel modules are sequentially staggered to enter an ultrasonic transmitting and receiving work cycle; and (3) transmitting trigger pulse signals at intervals by each channel module in a mode of gradually increasing interval time in an ultrasonic transmitting and receiving work period, and performing ultrasonic transmitting and receiving work. According to the cascade cooperative measurement method, cooperative measurement of multiple channel modules can be realized, the overall measurement efficiency can be improved while mutual interference of the channel modules can be avoided, and the cascade cooperative measurement method is adaptive to the multi-measurement-point high-speed scanning requirement of a large component.

A procedure for correcting a time variable (x) is used. spm ) described, which characterizes a reception time of an echo light pulse received during a LiDAR measurement in a temporal reference frame (40). The received echo light pulse originates from a scanning light pulse transmitted by a transmitter of the LiDAR system and reflected at at least one target. A measurement center point time parameter (x spm The temporal center point of the received echo light pulse is determined. A total measurement intensity quantity (A) is determined, which characterizes the total intensity of the received echo light pulse. A measurement pulse width quantity (w) is determined, which characterizes the temporal duration of the echo light pulse reception. An expected total intensity quantity (A) is determined. e ) is specified, which characterizes the total intensity of an ideal echo light pulse. An expected pulse width quantity (w) e) is specified, which characterizes the time length of the ideal echo light pulse. A center-of-mass correction parameter (Δ) sp ) is calculated using the total measured intensity (A), the measured pulse width (w), and the expected total intensity (A e ) and the expected pulse width size (w e ) determined. A corrected center of gravity time parameter (x spk ) is derived from the measurement center time parameter (x spm ) and the center of gravity correction quantity (Δ sp ) determined.

The invention discloses a deep foundation bearing capacity detection system and method based on a vertical deviation rectification strategy. The detection system comprises a ground supporting table, a top jack and a force transmission column. According to the invention, the verticality adjusting unit is adopted to realize the vertical deviation correction of the bottom acting load direction, the load is ensured to apply pressure downwards in the vertical direction in the testing process, and meanwhile, the hole bottom leveling unit is integrated in the scheme, so that the technical problem that the surface of the hole bottom is uneven and the load plate applies pressure unevenly is effectively solved, and the test efficiency is improved. The load applying directivity and the contact surface uniformity are optimized, and the overall measurement precision is improved; in addition, four pressure sensors at the bottom of the load plate are intelligently linked with an axial force loading and automatic leveling device, so that intelligent and automatic leveling and deviation correction of the load and eccentricity are realized; through the two jacks at the upper part, pre-pressing of bottom sediment is realized, and the situation that the test fails due to the fact that the stroke of a bottom loading device is consumed by thick sediment is avoided.

This invention discloses a method, apparatus, device, and storage medium for measuring repeatability using a corneal topography instrument. The method includes the following steps: performing multiple independent and repeated measurements on the same test surface using a corneal topography instrument to obtain multiple sets of corneal topography data; calculating the single-point standard deviation of each measurement point within the measurement area based on the multiple sets of corneal topography data to characterize the single-point repeatability of each measurement point; assigning an area weight value representing its spatial representativeness to each measurement point; and performing a weighted calculation based on the single-point standard deviation of each measurement point and its corresponding area weight value to obtain the overall measurement repeatability index of the corneal topography instrument. This invention overcomes the shortcomings of existing technologies that use the maximum single-point standard deviation to characterize repeatability, which is susceptible to gross errors, and provides a more comprehensive and objective repeatability evaluation scheme.

The invention discloses a magnetic particle imaging method based on multi-harmonic energy-full width at half maximum combined weighting, which comprises the following steps: acquiring point spread functions of a plurality of harmonic waves with different frequencies of magnetic nanoparticles, and constructing a corresponding system matrix; measuring a reference sample which does not contain the magnetic nanoparticles, and obtaining a plurality of noise matrixes corresponding to harmonic waves with different frequencies; measuring the sample to be measured, and obtaining magnetization response voltage vectors of a plurality of harmonic waves with different frequencies; respectively calculating an energy two-norm of a system matrix, an energy two-norm of a noise matrix and a full width at half maximum of a point spread function of the system matrix and the noise matrix; splicing the magnetization response voltage signals of each harmonic system matrix to form a total system matrix and a total measurement signal vector; calculating a weight factor of each harmonic wave and forming a weight matrix; and constructing a solution equation of the particle concentration distribution of the sample to be detected, and carrying out iterative solution on the solution equation to obtain a particle concentration distribution image of the sample to be detected. According to the invention, efficient utilization of multi-harmonic information is realized.

A method for determining a characteristic bit-flip time of a quantum qubit in a superconducting quantum device, comprises the following operations: a) initializing an idling time and a probability density function (P) of bit-flip time testing parameters (θ) according to a first probability distribution (p), said bit-flip testing time parameters (θ) comprising at least a decreasing lifetime rate (Γz) said probability density function (P) of bit-flip time testing parameters (θ) being a Poisson distribution with the probability of observing a total measurement outcome y = ∑i yi   being given by (see formula (I)), where p0 / 1 is a function comprising a component of the type e-Γzt, said probability density function of bit-flip time testing parameters (θ) being stored on a grid of values for the bit-flip time testing parameters (θ), b) preparing a physical qubit in a chosen state, c) idling for a duration derived from the idling time, d) obtaining a bit-flip measurement (y) by reading the state of the physical qubit, e) updating the probability distribution function of bit-flip time testing parameters (p(θ)) using the measurement (y) of operation d), the idling time of operation c), and with the formula p(θ) = p(θ)p(y|θ,t) / p(y,t), f) calculating an estimated information gain for each possible measurement time using the updated probability distribution function of bit-flip time testing parameters (p(θ)) of operation e), from the information gain equal to the difference between the Shannon entropy of the probability distribution function of the decreasing lifetime rate (p(Γz)) and the Shannon entropy of the conditional probability distribution function of the decreasing lifetime rate knowing the measurement of operation d) and the idling time (p(Γz|(y,t)), or an estimated information flow with the information flow which is a function of the information gain and the idling time, g) defining a new idling time as the value of time which maximizes the estimated information gain or the estimated information flow of operation f), h) Returning the bit-flip testing time parameters (θ) if p(θ) satisfies a return condition derived from the evolution of the decreasing lifetime rate (Γz), and / or comparison with a return threshold, and else repeating steps b) to g) with the idling time of operation g) and the probability distribution function (p) of bit-flip time testing parameters (θ) of operation e).

The invention discloses a measurement task scheduling method for a quality robot system, and the method comprises the steps: carrying out the modeling of the measurement time of a detection delegation order of a to-be-planned batch, and obtaining a time model consumed by a measurement task; constructing an objective function based on the expected complete inspection time, the measurement time model and the certificate time model, and constructing a 0-1 integer programming model of the measurement task by taking the tray number of the weight tray rack and the maximum measurement time as constraint conditions and the complete inspection remaining time as weak constraints; and inputting a batch detection delegation list to be planned into the integer programming model to obtain a scheduling result. Measurement tasks are optimized under the constraint conditions of the number of weight trays, the maximum total measurement time and the like, the measurement capacity of a mass robot system is fully utilized, cooperation of automatic measurement time and on-off time of detection personnel is achieved, the automatic measurement system continues to carry out continuous measurement work at night, and the work efficiency is improved. And the utilization rate of the quality robot system can be effectively improved.

The invention discloses a method for testing common-mode and differential-mode input capacitance of an operational amplifier, and the method comprises the steps: constructing and calibrating a test fixture model, and extracting parasitic parameters of the test fixture model; constructing an equivalent model of the test fixture model, and eliminating parasitic parameters of the test fixture model through de-embedding; connecting an operational amplifier circuit to be tested with the equivalent clamp model, and selecting a test mode; and testing the input capacitance of the operational amplifier circuit according to the test mode. The clamp model comprises an open circuit calibration structure and a short circuit calibration structure, and in the subsequent test, the clamp parasitic effect represented by the model can be mathematically eliminated from the total measurement data containing the clamp and the tested device through a de-embedding algorithm, so that the characteristic parameters of the tested device can be accurately obtained. According to the invention, the difficulty in measuring the parasitic capacitance and the high-impedance node of the probe is effectively overcome, and the high-precision and separated measurement of the input capacitance is realized.

The invention provides a multi-phase heightening follow-up detection system for laser cutting, and belongs to the technical field of laser cutting, the system realizes remarkable real-time performance improvement through a multi-phase sampling unit, can quickly respond to height change in the cutting process, and compared with a traditional single-channel detection mode, the detection efficiency is improved, and the detection cost is reduced. According to the scheme, the signal processing precision is improved. According to the parallel full-comparison denoising algorithm, the system has excellent anti-interference performance, and the processing speed is also improved. By applying the speed suppression method, the system can dynamically adjust the control parameters according to the cutting working condition, and the sudden change problem under the variable-speed cutting scene is effectively solved while the response speed is guaranteed. Through the combination of segmented calibration technologies, the system can adapt to the measurement requirements of different material characteristics and height intervals, and the adaptability of the system to different processing scenes is remarkably improved while the overall measurement precision is ensured.

To grasp a state of a combustion apparatus based on a flame state of a burner, a discharge number measurement unit measures the number of discharges of a flame sensor per unit time. A light emission information generation unit generates, as light emission information, information obtained based on a value obtained by dividing a total (accumulation) of the number of discharges per unit time measured by the discharge number measurement unit by a total measurement time. A determination unit determines the state of the combustion apparatus to be inspected based on the light emission information generated by the light emission information generation unit as described above.

The invention discloses a building measurement method based on unmanned aerial vehicle remote sensing, and relates to the technical field of building measurement, and the method comprises the steps: obtaining the initial position information of an unmanned aerial vehicle through a GPS, measuring the surrounding building information, constructing an initial three-dimensional building model, recording the movement track of the unmanned aerial vehicle, randomly extracting track points in the movement track, and carrying out the measurement of the unmanned aerial vehicle. The method has the advantages that by extracting the track points and calculating the distance between the track points and the adjacent tracks, the coverage integrity of the current layer can be verified, repeated measurement or missed measurement is avoided, data are extracted according to a preset period, redundant sampling is avoided, and the method is high in practicability and easy to popularize. Coverage of key point locations is guaranteed while the data size is reduced, the overall measurement time is shortened, measurement modes of a laser radar, a millimeter wave radar and an ultrasonic radar are divided into a measurement unit, a verification unit and an auxiliary measurement mode, and abnormal data are recognized and removed through data comparison of different combinations.

The application discloses a door and window frame rapid splicing structure quality detection method and system, relates to the door and window detection technical field, and the method comprises the following steps: obtaining initial frame structure measurement results, mechanical arm end dynamic behavior information, laser echo signal space distribution information and local temperature field information; predicting measurement result deviation distribution; calculating total measurement deviation value and measurement fluctuation range according to the measurement result deviation distribution; correcting the initial frame structure measurement results according to the total measurement deviation value to obtain target frame structure measurement results; determining a qualified judgment limit according to the measurement fluctuation range; and generating a quality detection result according to the target frame structure measurement results and the qualified judgment limit. The application can combine the deviation distribution, the measurement deviation value and the measurement fluctuation range to generate the quality detection result, so that the structure quality detection is realized, and the detection accuracy and product quality are improved.

A precision control and optimization method for cylindricity measurement of a water turbine rotor comprises the following steps: arranging common target spots by following three-dimensional distribution, surrounding control and redundancy constraint principles, and planning observation station positions covering all to-be-measured points and ensuring data connection redundancy to ensure overall measurement precision; a geodetic horizontal plane coordinate system consistent with a traditional reference is created, the elevation of a magnetic pole is measured in a segmented mode, and then the effectiveness and reliability of data in the measurement process are guaranteed through single-station accurate measurement, seamless station transfer based on a public target point between measurement stations and a single-side station closing strategy of target point measurement, magnetic pole measurement and target point remeasurement. A USMN algorithm is utilized to carry out overall adjustment on all observation station data, the data is iteratively optimized by analyzing residual errors and eliminating gross errors, then two coordinate systems of geodetic level and assembly are created for comparative analysis, and finally a cylindricity measurement result which is high in precision and meets the field assembly requirement is obtained. According to the method, more accurate measurement of the water turbine rotor can be realized.

The invention discloses a three-coordinate measuring machine detection path planning method based on hierarchical reinforcement learning. According to the hierarchical reinforcement learning model constructed by the invention, the optimal path generation considering the measurement angle change is realized, a bottom-layer agent adopts a weighted depth Q network to train a collision-free translation path planning strategy, and a top-layer agent adopts a group relative strategy optimization algorithm to train a measuring head rotation position decision strategy. On the basis, the learned reinforcement learning value function is used for estimating the measurement time between any two points, the measurement time is used for fitness calculation, and the optimal measurement sequence is solved through a heuristic algorithm. And finally, a complete detection path is generated in combination with the decision of the hierarchical agent and a post-processing algorithm. According to the method, the path value rather than the linear distance is used as an optimization target, efficient collaborative optimization of the measurement sequence, the obstacle avoidance path and the measurement head rotation is achieved, the total measurement time is remarkably shortened, and the problem that the efficiency is low due to planning disjunction in a traditional method is solved.

The application relates to a pulse calibration method, device and system of a single three-phase electric energy standard meter, the method comprises the following steps: obtaining a total measurement pulse period of a detected electric energy standard meter and a total standard pulse period of a reference electric energy standard meter; the total measurement pulse period is obtained by processing an electric measurement value according to a pulse conversion algorithm; the total standard pulse period is obtained by processing an electric standard value according to the pulse conversion algorithm; obtaining an error coefficient according to the total measurement pulse period and the total standard pulse period; and calibrating an electric parameter of the detected electric energy standard meter according to the error coefficient, so as to realize accurate calibration of the single three-phase electric energy standard meter. The application optimizes the error coefficient, calibrates the electric parameter of the detected electric energy standard meter according to the obtained error coefficient, can accurately reflect the relationship between the measurement value and the standard value, reduces the calibration error of the single three-phase electric energy standard meter, and thus improves the calibration accuracy of the single three-phase electric energy standard meter.

The invention relates to a shape and position integrated measurement method and system based on multi-sensor fusion, and relates to the technical field of optical measurement. The method comprises the following steps: calibrating internal parameters and external parameters of a sensor group; determining the measurement uncertainty corresponding to the sensors in the sensor group; performing parameter optimization on the sensor group in combination with the measurement uncertainty corresponding to the sensor; performing tight coupling on the measurement uncertainty corresponding to the sensor to obtain tight coupling uncertainty corresponding to the sensor and total measurement uncertainty corresponding to the sensor group; and combining the total measurement uncertainty to construct an integrated measurement model, wherein the integrated measurement model is used for simultaneously measuring the shape and the position of the polyhedral common optical element. The efficient multi-sensor measurement system is designed for solving the problem that the deflection measurement cannot effectively measure the surface shape and the pose at the same time. The precision of system calibration and workpiece positioning is effectively enhanced from the aspect of hardware, and then the surface shape and pose measurement capability of deflection measurement is improved.

The invention discloses an optical contact type composite measuring platform for numerical control multi-axis linkage, and relates to the technical field of measuring instruments. The invention aims to solve the problem that the overall measurement efficiency is reduced due to increase of non-measurement time caused by difficulty in forming self-adaptive normal fitting between the tip of a probe and the surface of a workpiece and incapability of realizing dynamic pose cooperative adjustment of a contact point. Dynamic pose cooperative adjustment can be realized by forming a double-side driving mode between a workpiece and a probe tip, and specifically, the to-be-detected workpiece in a carrying space is jacked and descended through cooperative action of a rotary jacking ring and an upper rotary shrinking ring; and the probe tip which can rotate and is combined with the deflection action is used for completing normal fitting of the workpiece part with any surface orientation, and finally rapid contact and measurement of the probe tip and the workpiece to be measured are completed, so that the purpose of effectively improving the measurement efficiency on the premise of remarkably reducing the non-measurement time of the workpiece to be measured is achieved.

The invention relates to a quick response electronic thermometer based on infrared detection, which is characterized in that a thin-wall hollow probe is made of a low-thermal-resistance and low-specific-heat-capacity material, and an internal high-emissivity processing surface and an infrared temperature sensor are combined, so that the contradiction that the speed and the precision of a traditional clamping type thermometer cannot be obtained at the same time is thoroughly solved; the thermometer probe can rapidly achieve heat balance with the armpit skin within 1-3 seconds, the internal infrared sensor synchronously and accurately captures signals, the total measurement time is shortened to be within 10 seconds from several minutes, the precision is comparable to that of an actual measurement type, errors of a prediction algorithm are avoided, the requirement for clamping tightness of the thermometer is low, fault tolerance is high, the measurement failure rate is greatly reduced, and the measurement accuracy is improved. The temperature measuring device provides the temperature measuring experience which is almost quick, accurate and reliable and can obtain the temperature by touching, is particularly suitable for infants, patients and other people who are difficult to cooperate, and is a major breakthrough of the armpit temperature measuring technology.

The application discloses a high-precision positioning method and system for land surveying, and relates to the technical field of land surveying. The method introduces a terrace step line segment set in the land surveying process, and constructs a terrace step section based on a plurality of boundary points continuously collected. The geometric relationship of the boundary points is modeled as a whole by using the consistency feature of the step extension direction and the stability feature of the step height level, so that the positioning result is no longer dependent on the instantaneous satellite positioning solution accuracy of a single boundary point, but can fully utilize the regular geometric structure of the terrace terrain itself to constrain and analyze the boundary points. In this way, in a complex measurement environment with shielding, multipath effect or satellite signal fluctuation, the influence of single-point anomalies on the overall measurement result can be effectively reduced, and the stability and reliability of the terrace boundary measurement result in terms of direction continuity and height consistency can be improved.

The invention relates to the technical field of tire size measurement, in particular to a tire size measurement mechanism which is characterized in that an adjusting mechanism is arranged on the upper side of a rotating table, and a positioning mechanism and a butt joint mechanism are arranged on the adjusting mechanism; the external diameter, the internal diameter, the total width and the section width of the tire can be synchronously and rapidly measured, the size parameters of all point positions of the tire can be comprehensively and rapidly collected while the high measurement efficiency is kept, the problem of surface damage possibly caused by traditional contact type measurement can be avoided, and the measurement accuracy is improved. The measurement process is not interfered by manual operation factors; according to the method and the device, the defect areas such as recesses and bumps on the surface of the tire can be subjected to self-adaptive compensation measurement, real and accurate geometric parameters can still be obtained at defect points, the problem of data distortion caused by irregular surface in traditional contact measurement is effectively solved, and unification of high efficiency and accuracy of the whole measurement process is ensured.

The invention discloses an incident angle measurement system and a measurement method thereof, and belongs to the technical field of optical measurement. The measuring system comprises an incident light modulation assembly, a signal processing assembly and an optical conversion and detection assembly; the optical transformation and detection assembly comprises an error amplification unit, a Fourier lens and a two-dimensional PSD detection unit. A reflected light beam from the front surface sequentially passes through the error amplification unit to amplify the angle deviation, passes through the Fourier lens to convert the angle change into the position displacement on the rear focal plane, the two-dimensional PSD detection unit located on the focal plane receives a light spot and outputs a corresponding electric signal, and the deviation value of an incident angle on a two-dimensional plane can be calculated in real time through the electric signal. The technical problem that the measurement precision of a triangulation method is affected by incident angle change caused by manufacturing errors of the surface of the glass protection window is effectively solved, non-contact, high-sensitivity and high-dynamic-response incident angle real-time measurement and compensation are achieved, and the overall measurement precision and adaptability of the system are remarkably improved.

The utility model relates to the technical field of measuring tools for civil engineering, and discloses a multifunctional measuring tool for civil engineering, which comprises two first measuring rulers, and a mounting mechanism and a moving mechanism are arranged at the tops of the two first measuring rulers. The measuring tool can synchronously measure instruments in a construction site up, down, left and right at the same time, so that a constructor can effectively obtain more information about a measured object, and the overall accuracy of measurement is remarkably improved; the measuring tool is installed by adopting a plurality of detachable measuring rulers and has certain portability, so that the measuring rulers can be easily carried, the measuring period is shortened, and the measuring efficiency is improved; meanwhile, the measuring tool can carry out multi-angle measurement, so that measurement results under different visual angles can be better verified, possible errors can be found and corrected in time, the overall measurement precision is improved, and the measuring tool is suitable for different site construction environments.

The utility model discloses special inclination measuring equipment for constructional engineering, and relates to the technical field of measuring equipment. The front side and the rear side of the outer wall of the mounting shell are respectively and fixedly connected with two graduated scales, then the vertical surface of an object is measured, a rotating shell and an inserting shell are taken out from the interior of the mounting shell through a connecting mechanism and are in contact with the vertical surface of the measured object, and if the vertical surface is uneven, the rotating shell and the inserting shell are connected with the graduated scales. The rotating shell drives the protractor and the inserting shell to rotate, inclination angle data can be measured by checking the intersecting scales of the scales on the protractor and the plane of the mounting shell, through the operation, the device integrates the function of measuring the inclination of the horizontal plane and the vertical plane of a measured object, no additional device is needed for operation measurement, the measurement process is simplified, and the measurement efficiency is improved. The operation complexity and the measurement time are reduced, and the overall measurement work efficiency is improved.

A thermal deformation measuring device is suitable for measuring thermal deformation of a machine tool and comprises a first test rod, a jig unit, a plurality of second test rods, three first displacement meters and three second displacement meters. And the first test rod can rotate along with the main shaft. The jig unit comprises a sleeve arranged on the upper and lower loading platforms in a sleeving manner, and a bearing module arranged on the workbench and used for arranging the second test rod. The first displacement meter is used for measuring the displacement of the first test rod. And the second displacement meter is used for measuring the displacement of each second test rod. Under the condition that the main shaft and the workbench operate at the same time, the thermal deformation measuring device can perform thermal deformation measurement on the main shaft and the workbench at the same time, the overall measurement time is effectively shortened, and thermal deformation of the main shaft and the workbench can be measured through energy.

This invention discloses a method, apparatus, computer equipment, and storage medium for analyzing meter errors in a distribution area based on a "3D graph." The method includes: dividing the meters in the distribution area into zones, further dividing the meters in each zone into points; establishing a 3D graph and a line graph based on the electrical energy input from the zone level to each point in each time period and the comparison data with the maximum and minimum measured electrical energy values ​​of each meter; identifying points that exceed the overall meter measurement replacement threshold, then identifying the installation time of the meter with the most errors at each point, and uploading the corresponding meter information to the distribution area; the distribution area extracts and calculates the electricity consumption of the meters based on the meter information at each point, and infers the error values ​​from the 3D graph and line graph data; if the meter error exceeds the overall meter measurement replacement threshold, the corresponding meter at each zone level is replaced. The method provided by this invention allows for timely understanding and processing of meter conditions.

This invention discloses a settlement monitoring device for building foundations, relating to the field of foundation monitoring technology. It includes a mounting plate assembly with a height adjustment component, a settlement component, a numerical amplification component, and a snap-fit ​​component on its top surface. The mounting plate assembly includes a base plate and four threaded rods. The bottom of the height adjustment component is connected to the top surface of the base plate, and the height adjustment component is used to adjust the vertical height of the settlement component. The top of the height adjustment component is connected to the bottom of the settlement component, and the outer periphery of the settlement component is connected to the bottom of the numerical amplification component. The numerical amplification component is used to convert the settlement value of the settlement component into a visual value for display. This invention incorporates an amplification structure that can achieve ultra-high magnification of displacement, adapting to the monitoring requirements of high precision and minimal settlement, making minute settlement displacements clearer. Furthermore, the simultaneous operation of two amplification structures in the device reduces errors and improves overall measurement accuracy.