49results about How to "Improve measurement reliability" patented technology

This invention provides a method and system for measuring couplings in hydro-generator sets based on marker point transfer, relating to the field of hydro-generator set installation and measurement technology. The method involves: S1: Setting reference marker points: Installing at least three non-collinear reference marker points on the runner and turbine shaft to be coupled; S2: Performing independent shape measurements on the runner and turbine shaft to determine their respective measurement references and obtaining a spatial positional relationship model between them and their respective component measurement references; S3: Measuring the current spatial coordinates of the reference marker points already set on the runner and turbine shaft; S4: Based on the reference marker point coordinates and the spatial positional relationship model, calculating the actual spatial position and orientation of the currently obscured runner coupling surface and turbine shaft coupling surface. This method achieves digital control of coupling accuracy, improves coupling operation efficiency, enhances measurement accuracy and reliability, increases installation efficiency, and improves the applicability of the method.

The invention discloses a cylindrical battery measurement method based on machine vision, which comprises a double-line scanning correlation system, the double-line scanning correlation system comprises a top surface camera and a bottom surface camera, and the measurement method comprises the following steps: S100, the top surface camera collects a cylindrical battery top surface depth map, and the bottom surface camera collects a cylindrical battery bottom surface depth map; s200, intercepting a point set of a predetermined area of the top surface of the cylindrical battery as a top surface measurement point cloud, and intercepting a point set of a predetermined area of the bottom surface as a bottom surface measurement point cloud; s300, importing a predetermined calibration matrix T, and transforming the top surface measurement point cloud and the bottom surface measurement point cloud into the same coordinate system; and S400, respectively fitting the plane equation of the top surface measurement point cloud and the plane equation of the bottom surface measurement point cloud in the same coordinate system to calculate the distance between the top surface and the bottom surface so as to obtain the height dimension of the cylindrical battery. Manual direct measurement is avoided, measurement is achieved through computer vision, and the measurement reliability is improved.

This application relates to the field of medical device technology, and provides a calibration device for a pressure guidewire, including a vascular simulation circuit and a pressure testing device. The vascular simulation circuit includes a connecting pipe, and a pump and a control valve connected sequentially through the connecting pipe. A biomimetic solution is placed inside the connecting pipe, and the pump provides power to drive the biomimetic solution to circulate. The pressure testing device is connected to the connecting pipe and has a head end for acquiring the liquid pressure in the connecting pipe. The control valve includes a main pipe and a first branch pipe and a second branch pipe respectively disposed on the main pipe. The connecting pipe includes a first pipe and a second pipe. One end of the first pipe is connected to the pump and the other end is connected to the second branch pipe. One end of the second pipe is connected to the pump and the other end is connected to the main pipe. The second branch pipe is used for inserting the pressure guidewire to be tested. The vascular simulation circuit simulates the real human intervention environment, reduces the influence of environmental errors, and improves calibration accuracy.

This invention relates to the field of optical measurement equipment technology, specifically disclosing a mirror fixing device for optical measurement, comprising: a base, wherein a support rod is slidably connected to the base, and a fixing frame is fixedly connected to the support rod; a rotating shaft, rotatably connected to the fixing frame, a connecting frame being fixedly connected to the rotating shaft, and two support shafts being rotatably connected to the connecting frame, with a fixing shell fixedly connected between the two support shafts; two fixing columns, each fixedly connected to both sides of the fixing frame, each fixing column being slidably connected to a sliding rod, and a guide ring being fixedly connected between the two sliding rods; and a connecting shell, fixedly connected to one side of the fixing shell, with a ball-end rod slidably connected to the connecting shell. This invention eliminates the need for easily fatigued springs, employing a fully mechanical threaded sleeve and worm gear transmission mechanism to achieve angle and direction adjustment. This mechanical structure eliminates the problem of elasticity attenuation and has strong resistance to vibration interference.

The utility model relates to aircraft detection equipment technical field, concretely is an aircraft static tensile performance calibration system, include: test bench, test bench top is equipped with test platform, test platform top surface is equipped with main shaft, and the motor and propeller are installed to the front end of main shaft through flange frame, the last end of main shaft is equipped with first pull pressure sensor, and the torque transmission rod is equipped under flange frame, and the second pull pressure sensor is connected through transmission structure to the lower end of torque transmission rod. The utility model, will detect the sensor of pull pressure and detect torque separate arrangement, through independent force transmission path carries out measurement, has eliminated the mutual interference among traditional series structure, has improved measurement accuracy and reliability, through the main shaft is post, has simplified the installation mode of motor, and the pull pressure and torque that motor and propeller produce can directly be transmitted to main shaft, need not pass through the shaft coupling, has simplified the system, when replacing motor and propeller, need not adjust main shaft, has improved the versatility and test efficiency.

The utility model relates to the technical field of deep well measuring equipment, in particular to an anti-deviation deep well measuring instrument telescopic rod locking device which comprises a telescopic rod body, a locking assembly is arranged at the end of the telescopic rod body, and the locking assembly comprises an L-shaped plate fixedly installed at the end of the telescopic rod body. A vertical section plate body of the L-shaped plate abuts against the inner wall of the deep well, a left anchor rod and a right anchor rod are inserted into a top plate body of the L-shaped plate, the anchor rods are inserted into soil around the deep well for fixing operation, a vertical plate is fixedly installed on the bottom face of an end plate body of the L-shaped plate, a threaded rod is in threaded connection with the vertical plate, and a pressing disc is fixedly installed at the inner end of the threaded rod. The compressing disc is compressed on the outer surface of the deep well, and the telescopic rod body comprises a first connecting rod, a second connecting rod in sliding connection with the first connecting rod and a third connecting rod in sliding connection with the second connecting rod. According to the utility model, the telescopic rod can be conveniently locked, deviation is prevented, and the measurement accuracy is improved.

This application proposes an error self-correction method and system for intelligent temperature instruments used in nuclear power plants. The intelligent temperature instrument includes a platinum resistance temperature sensor and an intelligent temperature transmitter. The intelligent temperature transmitter has a multi-channel analog-to-digital conversion module and a standard resistor connected to a second channel of the analog-to-digital conversion module. The method includes: measuring the measured resistance value of the standard resistor, and then determining a first correction parameter based on the measured resistance value; measuring the initial resistance value of the platinum resistance temperature sensor; calculating the cumulative irradiation dose based on the operating time and irradiation dose rate; inputting the cumulative irradiation dose, irradiation dose rate, operating time, and number of thermal cycles into an irradiation-thermal cycling joint aging model to obtain a second correction parameter; and calculating the measured temperature of the intelligent temperature instrument based on the corrected resistance value. The technical solution proposed in this application achieves online, real-time error self-correction without manual intervention, significantly improving the long-term stability and measurement reliability of the instrument.

The application discloses a device and method for measuring fluorescence quantum yield of two-dimensional transition metal chalcogenide compound material, and belongs to the technical field of optical measurement and material characterization. The method comprises the following steps: calibrating a system response function about wavelength; measuring the absorption rate of the two-dimensional transition metal chalcogenide compound material to incident laser; measuring the photoluminescence spectrum of the two-dimensional transition metal chalcogenide compound material; measuring the integral intensity of the diffuse reflection spectrum under the same condition by using a diffuse reflection mirror; and calculating the fluorescence quantum yield of the two-dimensional transition metal chalcogenide compound material according to the system response function, the absorption rate of the two-dimensional transition metal chalcogenide compound material to incident laser, the photoluminescence spectrum of the two-dimensional transition metal chalcogenide compound material and the integral intensity of the diffuse reflection spectrum. The fluorescence quantum yield of the two-dimensional transition metal chalcogenide compound material can be accurately measured, so that the quantitative, rapid and non-destructive characterization of the light-emitting efficiency of the two-dimensional transition metal chalcogenide compound material is realized.

This application relates to the field of tool measurement equipment technology, and in particular to a tool parameter measurement system and method. In use, a standard part is first clamped onto a tool pre-adjustment component. A moving assembly drives a first mounting component to move vertically and along a first direction, allowing the camera imaging device to focus on the zero-gauge surface of the standard part. A laser sensor is connected and installed on the first mounting component. Utilizing its rotational function around the first direction and its fine-tuning function along a second direction, combined with the mandrel surface of the standard part, the yaw angle and offset are calibrated to establish a unified linear laser measurement coordinate system. When the standard part is replaced with the part to be measured, the camera imaging device can be used to measure the projected dimensions of the part, or the laser sensor can be used to scan the spiral groove contour of the part and calculate the core diameter after coordinate transformation and filtering, or the laser sensor can be rotated to scan one revolution to obtain a point cloud and reconstruct a 3D model. The laser sensor can be disassembled and reassembled as needed, achieving integrated tool measurement and improving measurement accuracy.

The present application relates to radar detection technology field, especially to a kind of signal processing method of Doppler frequency offset interference of height-finding radar, the method is by monitoring the maneuverability of height-finding radar and dynamically adjusting frequency modulation period and frequency modulation bandwidth of symmetrical frequency modulation signal;Based on the frequency modulation period and frequency modulation bandwidth after adjustment generate positive slope frequency modulation signal and negative slope frequency modulation signal and carry out periodic alternate emission, collect and process and difference calculation first echo signal and second echo signal after reflection, obtain after eliminating Doppler frequency offset interference ranging frequency difference, further avoid the height-finding error caused by Doppler shift amount, to obtain accurate target height based on ranging frequency difference calculation.This application is by using the Doppler shift polarity opposite characteristics of positive and negative slope frequency modulation signal, by frequency spectrum line pairing and difference calculation offset Doppler shift component, finally based on the target height of corrected frequency information inversion, to realize high-precision height-finding.

The invention discloses a correction method and device for ellipsometry, and a storage medium. The method comprises the following steps: collecting energy intensity distribution of a light spot at an exit pupil plane position of an incident arm lens; on the basis of energy intensity distribution, a discretized intensity distribution dot matrix is generated in a self-adaptive mode, and the normalized weight of each point is calculated; establishing a discretized numerical aperture distribution function based on the intensity distribution dot matrix, the normalized weight and the lens numerical aperture parameter; and correcting a depolarization effect in spectral ellipsometry by using the numerical aperture distribution function to obtain a measurement result of the optical critical dimension or the film thickness. According to the method, the accurate numerical aperture model is established through the real light spot characteristics, the problem of measurement errors caused by light spot deformation caused by the diaphragm is effectively solved, the accuracy and reliability of optical critical dimension or film thickness measurement are remarkably improved, and meanwhile the method has the advantages of being low in implementation cost and high in adaptability.

The utility model relates to the technical field of Coriolis mass flow meters, in particular to a platinum resistor temperature measurement circuit of a Coriolis mass flow meter, which comprises a reference constant current branch, a temperature measurement constant current branch, a differential amplification circuit and a platinum resistor temperature measurement branch, and the reference constant current branch and the temperature measurement constant current branch are respectively connected with reference voltage; the reference constant current branch is connected with the differential amplification circuit and the platinum resistor temperature measurement branch. The temperature measurement constant current branch is respectively connected with the differential amplification circuit and the platinum resistor temperature measurement branch; according to the constant current source driving circuit, a constant current source driving mode is adopted, deviation of measurement caused by the fact that wire resistance changes along with temperature is avoided, accuracy and stability of overall temperature measurement are improved, and the constant current source driving circuit is particularly suitable for a Coriolis mass flow meter system with the high requirement for measurement accuracy. The circuit is simple in structure, high in element universality and convenient to popularize and apply in actual industrial products.

The application discloses a bearing rotating speed measuring tachometer and belongs to the field of bearing rotating speed measuring tachometers. The tachometer comprises a mounting vertical plate, a rotation-preventing fixing piece is detachably mounted on the upper surface of the rear surface of the mounting vertical plate through bolts, the rotation-preventing fixing piece is internally fixedly connected with a bearing seat, the outer side of the rear surface of the bearing seat is threadedly provided with a shell, the inside of the shell is provided with a main control board, and the rear surface of the main control board is provided with a Hall sensor; the inner side of the rear surface of the bearing seat is fixedly connected with a bearing, the inner side of the bearing is provided with a bearing connecting shaft, and the rear end of the bearing connecting shaft penetrates through the rear of the bearing seat; the tachometer effectively solves the defects of the prior measuring device, has a reasonable overall structural design, is high in adaptability, convenient to install and debug, does not need to additionally set a counterweight, reduces the risk of rotor imbalance, and improves the measurement reliability under high-speed working conditions.

The utility model discloses a kind of thickness detection devices for optical communication module parts, belong to optical communication module technical field, including base, fixedly connected with scale on the base, measuring device is arranged outside scale, the front of measuring device is fixedly connected with irradiation device and auxiliary device, measuring device includes moving plate, and moving plate is arranged outside scale.This utility model, after the workpiece to be measured is accurately placed on base positioning surface, slowly release clamping plate, when pressing plate is vertically downward along scale under gravity, when the lower surface of pressing plate and the upper surface of workpiece are completely contacted, moving plate stops movement, the relative position of moving plate on scale at this time is the thickness value of workpiece, by directly reading the scale line corresponding to the edge of moving plate on scale, intuitive, accurate thickness measurement result can be obtained, entire measurement process does not need additional power source, relies on gravity to realize automatic positioning.

This application relates to a sensor consistency testing device in a tubular moisture content detection device, suitable for testing the consistency of two or more moisture content sensors within the tubular moisture content detection device. The device includes: a test tube, a base, and a positioning sleeve; both the test tube and the positioning sleeve are mounted on the base and detachably connected to it, with the positioning sleeve located within the cavity of the test tube; the inner diameter of the test tube is adapted to the outer diameter of the tubular moisture content detection device, and the inner diameter of the positioning sleeve matches the tip of the tubular moisture content detection device, enabling the tubular moisture content detection device to be installed within the test tube, with the tip of the tubular moisture content detection device inserted into the positioning sleeve; wherein, the test tube is made of a preset material, and the test tube is suitable for providing a uniform standard test medium for the sensors in the tubular moisture content detection device.

The invention relates to the technical field of vision, in particular to a contour selection method, device and equipment of a line laser contourgraph and a storage medium. Energy values of peak values of each column of light bands in image data which is collected by a camera and contains multiple columns of light band information are calculated and sorted, and the data are segmented into high and low threshold value peak sets according to a first preset threshold value and a second preset threshold value; and selecting alternative high-quality peak values from the high-threshold peak value set according to a peak value mode, calculating the point position continuity of the alternative high-quality peak values to determine a final high-quality peak value set, and repairing according to the final high-quality peak value set and the high and low-threshold peak value sets to obtain a final contour point set. According to the invention, the problem of inaccurate contour selection of an existing algorithm under complex illumination is effectively solved, and the measurement precision and reliability are improved.

This invention discloses an automated anti-fouling device for the convex surface of an optical probe lens. The device includes an optical probe mounted on a robotic arm. The lower end of the optical probe is the exposed convex surface of the lens. A horizontally rotating servo motor is mounted on one side of the lower end of the optical probe via a servo motor support. A swing arm is vertically connected to the servo motor's shaft, and an anti-fouling cap is fixedly connected to the end of the swing arm. When the optical probe is in operation, the anti-fouling cap separates from the convex surface of the lens and is outside the detection range of the optical probe. After the rotating shaft rotates a predetermined angle, the anti-fouling cap swings with the swing arm to the coaxial center, covering the convex surface of the lens and actively preventing contamination. This device can safely clean and simultaneously dry the convex surface of the optical probe lens, ensuring measurement accuracy and long-term stable operation of the equipment.

The invention belongs to the technical field of core nuclear magnetic resonance measurement, and provides a mobile core nuclear magnetic resonance measurement method and system based on step length control, and the method comprises the steps: carrying out the calibration of different positions of a coil, and obtaining the calibration coefficients corresponding to the different positions of the coil through a moving stepping mode; after the coil is scaled, the core to be tested is moved to a coil signal acquisition area for testing according to a set step length based on a scale coefficient; during testing, the same stepping mode is kept in the scale process, T2 signals of the full-diameter to-be-tested rock cores at different length positions are obtained, and nuclear magnetic resonance data of the to-be-tested rock cores are obtained through data processing. By means of accurate driving of the stepping motor, errors caused by manual operation or mechanical instability in traditional measurement are eliminated, repeatability and consistency of measurement are greatly improved, and reliable guarantee is provided for subsequent data analysis.

The invention discloses a pressure fluctuation collaborative anti-interference method of a capacitive ceramic vacuum gauge and related equipment. The method comprises the following steps: collecting capacitance detection signals and hardware characteristic parameters of the capacitive ceramic vacuum gauge; based on the hardware-interference incidence relation and the hardware characteristic parameters, interference frequency bands and amplitude intervals introduced into the capacitance signals by the multiple hardware response characteristics are determined; extracting the pressure change rate and fluctuation amplitude of the capacitance signal, and determining the compensation weight of each hardware response feature through spectrum energy analysis; matching a reference compensation parameter of the current pressure fluctuation scene based on the graded compensation parameter, and performing weighted calculation by using a hardware compensation weight to generate an adaptive compensation coefficient; and filtering the capacitance detection signal by using the adaptive compensation coefficient to obtain a compensated signal. According to the invention, through hardware characteristic parameterization and multi-path interference characteristic identification, cooperative adaptation of the physical structure of the vacuum gauge and the anti-interference algorithm is realized, and the measurement precision and stability in a complex pressure fluctuation scene are improved.

The application discloses a pupil diameter measurement method and device based on real-time calibration, and belongs to the technical field of pupil measurement. The method is characterized in that two point light sources with a fixed interval L are installed around the lens of a camera, so as to form Purkinje spots on the corneal surface; after an image containing an eye, a spot and a pupil is captured, the pixel distance P of two spot image points is measured ref ; the calibration coefficient K in the current state is calculated in real time by combining the known interval L and the pre-calibrated correction coefficient β, i.e., K=L×β / P ref ; the pixel diameter P of the pupil in the same image is measured again pupil ; and finally, the actual pupil diameter D=K×P pupil is calculated. The device correspondingly comprises a camera module, a point light source, an image processing and calibration calculation module. The application utilizes reference spot real-time dynamic calibration, effectively eliminates the measurement error caused by the distance and angle change between the camera and the eye, and significantly improves the accuracy and reliability of the pupil diameter measurement.

The invention discloses an ancient bridge deflection non-contact measurement method based on binocular vision. In order to solve the problem that the ancient bridge is made of a special material and cannot adopt a contact sensor due to the limitation of cultural relic protection, a high-contrast artificial vision mark point is arranged at a to-be-detected point, and laser irradiation is assisted to enhance image features; a binocular camera system is accurately calibrated through a Zhang Zhengyou calibration method, and the geometric accuracy is improved by combining distortion removal and epipolar correction; realizing three-dimensional reconstruction of the mark points by using a block matching algorithm, and extracting vertical displacement as an initial deflection value; and a dial indicator is synchronously introduced for calibration. Experiments show that after error calibration, the average relative error of the final deflection measurement result relative to the reference value of the dial indicator is stably controlled within 7%, the engineering precision requirements of safety preliminary evaluation and health monitoring of the ancient bridge structure are met, real non-destructive, low-cost and high-reliability ancient bridge deflection measurement is achieved, and the method is suitable for popularization and application. And a feasible technical path is provided for cultural relic bridge health monitoring.

This utility model discloses a tire tread depth measuring device, including a main housing with a front ramp and a rear ramp connected to its front and rear ends, respectively. The main housing includes a base and a top cover connected to the upper end of the base. A camera, a laser emitter, and a press trigger mechanism are sequentially installed in the inner cavity of the base along the wheel travel direction. The top cover includes a first cover plate, a second cover plate, and a third cover plate. One end of the second cover plate has a first mounting slope, and the other end has a second mounting groove. A camera window opposite the camera and a laser window opposite the laser emitter are respectively installed on the bottom surface of the first mounting slope and the second mounting groove. A laser shielding device is installed at the opening of the second mounting groove. A dust removal mechanism is also installed in the inner cavity of the base. This device can automatically measure the tire tread depth with high stability and reliability, high efficiency, high accuracy, and high safety.

This application provides a method, electronic device, and storage medium for extracting load inductance from on-chip S-parameters. The method includes: acquiring measured values ​​of an on-chip open-circuit calibrator and an on-chip short-circuit calibrator; calculating the current load inductance of the on-chip load calibrator based on a predetermined formula, using the load resistance value of the on-chip load calibrator, the measured values ​​of the on-chip open-circuit calibrator, and the measured values ​​of the on-chip short-circuit calibrator; and calibrating the device under test (DUT) based on the current load inductance of the on-chip load calibrator. This application can improve the measurement reliability of on-chip S-parameter measurement systems.

The invention provides an asphalt pavement rut detection method and related equipment, and the method comprises the steps: taking part of original asphalt pavement image data of an original asphalt pavement image set of a target road section as a training set to train an improved RAFT-Stereo network, and obtaining a stereo matching model; the original asphalt pavement images except the training set are input into a stereo matching model for parallax estimation and then converted into high-precision dense pavement point clouds; performing spatial registration and fusion on the high-precision dense pavement point cloud to obtain a fused pavement point cloud; performing cross section line extraction on the spliced pavement point cloud to obtain a cross section line of the target road section, and performing calculation by using the cross section line of the target road section to obtain the pavement rut depth of the target road section; the millimeter-level reconstruction precision is realized in a real urban road weak texture environment so as to improve the measurement reliability.

The present application relates to the technical fields of wrench accessory, and discloses an angle correction gauge for torque wrench adapter and a tool assembly, which comprises a bottom shell, a scale disc and a display disc, the display disc is rotatably installed on the central shaft of the bottom shell, the scale disc is arranged between the bottom shell and the display disc and is fixed with the bottom shell, the outer side of the bottom shell is connected with a tail support, the tail support is provided with a wrench socket, which is used for clamping cooperation with the torque wrench, so that the torque wrench extends along the central shaft in the radial direction, the display disc is provided with a stop block, the stop block is provided with a stop portion for limiting cooperation with the adapter, the central shaft is further provided with a protruding portion, which is used for axial positioning of the connection between the torque wrench and the adapter, the surface of the scale disc is circumferentially and intervaliy provided with a plurality of coefficient scales, the display disc is provided with a display window, and the display window corresponds to the coefficient scales, the central shaft is the vertex, the included angle between the wrench socket and the stop portion is θ, the coefficient value displayed by the display window is δ, and δ and θ are one-to-one corresponding.

The embodiment of the invention provides an attitude control system for construction of a tube push bench, which comprises a multi-source sensing and data acquisition module, a data fusion and attitude calculation module, an intelligent hierarchical control decision module, an execution mechanism driving module and a comprehensive monitoring and diagnosis module. Continuous and high-precision all-attitude resolving and absolute coordinate positioning which are not limited by sight lines are achieved, and the measurement reliability of long-distance and curve section construction is remarkably improved. The system adopts a layered intelligent control architecture, combines a classical control law and an online learning mechanism, can dynamically adapt to the changing load and external disturbance of the tube push bench, realizes accurate and steady attitude adjustment, and reduces the manual intervention demand and the operation difficulty. Meanwhile, the maintainability and the construction transparency of the system are enhanced through the omnibearing state monitoring and diagnosis functions, and therefore the automation level, the guiding precision and the engineering efficiency of rectangular pipe jacking construction are integrally improved.

The invention discloses a plate spring type pantograph monitoring device, a plate spring type pantograph applying the same and a monitoring method, and relates to the technical field of detection. A plate spring type pantograph monitoring device comprises sensor assemblies, the sensor assemblies are arranged on a left plate spring and a right plate spring, and each sensor assembly comprises at least 12 sensors. According to the monitoring device of the plate spring type pantograph, the sensor assemblies are arranged on the left plate spring and the right plate spring, measurement of contact force is achieved, the plate springs are accessories used for a long time and can be replaced only when a vehicle is overhauled, and the technical requirement for long-term monitoring without replacement can be met; a plurality of strain sensors are combined with a positive and negative group bridge algorithm to remove the influence caused by zero drift, the system can be used for a long time, calibration is not needed, the redundancy of the monitoring device is improved, the sensors are installed at non-stress positions, the temperature compensation effect is achieved, and the measurement precision and reliability are further improved.

This invention discloses a self-powered, self-calibrating current measurement device, system, and method. The device includes a power extraction and measurement coil, a magnetoresistive sensor array, a first current sampling circuit, a second current sampling circuit, a protection circuit, a power extraction circuit, a battery and power management circuit, and a control circuit. The power extraction and measurement coil is used to obtain electrical energy and measurement signals from the measured conductor. The protection circuit is connected to the power extraction and measurement coil. The power extraction circuit is connected to the power extraction and measurement coil. The first current sampling circuit is connected to the power extraction and measurement coil. The second current sampling circuit is connected to the magnetoresistive sensor array. The control circuit is connected to each circuit and is used to control the switching of the operating mode of the power extraction and measurement coil, and to perform calculations and calibration based on the measurement signals from the two sampling circuits. This application realizes the online self-calibration function of a wideband magnetoresistive sensor array, and provides a low-cost, high dynamic range, high bandwidth, low power consumption, and small size high-reliability current monitoring scheme for power distribution networks with self-powered operation.

The invention discloses a full-polarization radar polarization basis non-orthogonal error model correction method and a non-orthogonal error angle acquisition method so as to realize high-precision measurement of a target scattering matrix. According to the correction method, a scattering matrix measurement model containing error parameters is established, an influence mechanism of polarization basis non-orthogonality on a scattering matrix is systematically analyzed, and error compensation is carried out on a target measurement scattering matrix. According to the error angle obtaining method, inversion of the error angle is completed through the metal wire. According to the method, the polarization basis non-orthogonality error caused by factors such as antenna installation deviation can be effectively eliminated, the scattering matrix measurement precision and the inversion accuracy of target parameters are remarkably improved, and a reliable polarization basis correction solution is provided for a complete polarization radar system.

A flow particle measuring device and a flow particle measuring method are disclosed. The flow particle measuring device includes: a light source for generating a laser beam; a flow cell through which a liquid sample containing particles to be measured is irradiated by the laser beam; a flow path for supplying the liquid sample to the flow cell; a flow meter connected to the flow path for measuring the flow rate of the liquid sample; and a temperature sensor for measuring the temperature around the flow cell or around the light source.