13results about How to "Improve measurement repeatability" patented technology

The invention discloses a wafer-level test probe station environment temperature calibration method, system and device and a medium. The method comprises the steps that a heat conduction block is controlled to be placed at any test point position on the surface of a probe station tray; the detection part of the control temperature sensor is inserted into the hollow hole channel of the heat-conducting block; the probe station is controlled to be heated to a target temperature value, and temperature time sequence data are collected through a temperature sensor; when a temperature stable state is reached, calculating a temperature calibration difference value based on the temperature time sequence data; controlling each test point of the heat conduction block and the temperature sensor on the surface of the tray to obtain a temperature calibration difference value of each test point; and according to the temperature calibration difference value of each test point, determining an overall temperature calibration value and carrying out temperature calibration. According to the invention, the problems that errors are caused by small contact area in traditional contact measurement, and temperature stable nodes cannot be judged and the uniformity of a tray temperature field cannot be evaluated are solved, the temperature quantification precision and calibration accuracy of a wafer-level test environment are improved, and the reliability of a chip test result is guaranteed.

The invention provides a pollutant spatial distribution and blow-off and tempering limit measurement method based on a flat flame burner, and relates to the technical field of combustion experiment measurement. According to the method, on the basis of a flat-flame burner, a quartz cover is arranged above the flat-flame burner to form a locally-closed space, and a long-strip-shaped measuring window is formed in the side face; an X-Y plane movable precision probe structure is arranged on the outer side of the window, so that the tip of the sampling probe can extend into a region adjacent to the flame at any coordinate point in the window plane; a camera is arranged on the outer side of the quartz cover, and a camera pixel coordinate probe physical coordinate conversion relation is established through calibration; controlling the probe to move point by point according to a preset scanning path, synchronously collecting pollutant concentration and flame images, and obtaining a pollutant two-dimensional or three-dimensional distribution field under a given working condition; parameters such as gas flow and air-fuel ratio are adjusted, the blow-off / tempering limit is approached and crossed, scanning is repeated at key nodes, and pollutant distribution characteristics in different combustion stability states are obtained.

The present application relates to the technical field of profile measurement, and particularly relates to a pipe blank inner profile measurement device and a measurement method. The pipe blank inner profile measurement device comprises a pipe blank supporting mechanism, a cantilever mechanism, a laser measurement module, a rotation angle measurement module and a data acquisition and control system. The pipe blank supporting mechanism is used for supporting and positioning the pipe blank. The cantilever mechanism comprises a cantilever. The laser measurement module is used for entering the pipe blank to obtain ranging data under the driving of the cantilever. The rotation angle measurement module is used for obtaining the rotation angle data of the laser measurement module. The data acquisition and control system is used for obtaining the inner profile data of the pipe blank to be measured based on the ranging data and the rotation angle data. The present application is a non-contact measurement method, which does not cause damage to the surface of the measured object, is suitable for the measurement of precise parts and fragile materials, and can automatically complete the data acquisition, processing and analysis of the measurement process through the integrated data acquisition and control system, and the measurement efficiency is high.

This invention relates to the field of transducer technology, specifically to an integrated coupled piezoelectric ultrasonic transducer, comprising an aluminum alloy cylindrical shell; silver-impregnated electrodes on both the upper and lower surfaces of the sensing unit, which simultaneously excite longitudinal and transverse waves under high-voltage pulse excitation; a backing damping block for absorbing reverse sound waves and improving signal clarity; a stainless steel bottom cover fixed to the open end of the shell and tightly coupled to a piezoelectric ceramic sheet, serving as protection and sound wave transition; an integrated coupling layer consisting of a flexible solid coupling sheet pre-attached to the outside of the stainless steel bottom cover; and a magnetic fixing ring, a ring-shaped neodymium iron boron permanent magnet embedded in the shell, for providing attraction force to the ferromagnetic bolts to stabilize the coupling pressure. Its advantages include: extremely simplified structure, compact size and light weight, low cost, elimination of measurement errors, improved measurement repeatability, and greatly simplified on-site operation procedures.

The application discloses a kind of based on light field diffraction iteration's spherical element surface shape reconstruction system and method, it is related to the detection of spherical element surface shape in optical detection technical field, its purpose is to solve the technical problem of high measurement cost, low measurement efficiency caused by the surface shape measurement method needing reference plane in prior art when spherical element surface shape reconstruction.Light is divided into two ways after spectroscope, one way of transmission light is absorbed by light trap to avoid forming stray light, another way of reflection light is finally recorded diffraction spot map by CCD camera after the spherical mirror to be measured, phase reconstruction algorithm based on light field diffraction iteration is used to realize spherical element surface shape reconstruction, obtain the surface shape distortion containing the error of spherical mirror to be measured, the surface shape distortion not containing the error of spherical mirror to be measured, finally obtain the surface shape error of spherical mirror to be measured, the whole process does not need the surface shape measurement method of reference plane, measurement cost is lower, measurement efficiency is higher, has great application prospect.

The utility model relates to the technical field of sensors, and discloses a measuring rod for a static magnetic grid linear displacement sensor, which comprises a measuring rod body and a support frame, the outside of the measuring rod body is connected with a protective assembly, the top of the support frame is connected with a guide assembly, and the top of the guide assembly is connected with a limiting assembly; compared with the prior art, the measuring rod for the static magnetic grid linear displacement sensor has the advantages that the measuring rod body can be guided to do linear motion and is prevented from shaking, shifting or swinging in the motion process, so that the measuring accuracy and repeatability of the measuring rod for the static magnetic grid linear displacement sensor are improved; the measuring rod body can be prevented from being corroded, abraded and collided by the external environment, and the reliability of the measuring rod for the static magnetic grid linear displacement sensor is improved. According to the measuring rod for the static magnetic grid linear displacement sensor, displacement of the measuring rod body under the action of external force can be effectively limited, unnecessary deviation or shaking of the measuring rod body is prevented, the fixed position of the measuring rod body after movement is kept, and the stability of the measuring rod for the static magnetic grid linear displacement sensor is improved.

The invention discloses a device and a method for testing crystal uniformity by using photoelectric characteristics. Comprising the following steps: presetting a plurality of different target detection wavebands, and scanning a target detection area of a to-be-detected crystal by using exciting light under each preset target detection waveband to obtain a fluorescence signal matrix; preprocessing the fluorescence signal matrix under each target detection waveband to obtain a fluorescence intensity distribution matrix, and extracting single-waveband uniformity parameters from the fluorescence intensity distribution matrix; and carrying out fusion processing on the single-band uniformity parameters under all the target detection bands to obtain a crystal uniformity parameter as a test result. According to the method disclosed by the invention, quantitative result output of global and local uniformity of the crystal uniformity is realized.

The application discloses an oil saw guide plate flatness and groove wear image measurement method and system, relates to the technical field of machine vision image measurement, and the method obtains guide plate multi-source fusion image data through the cooperative collection of a line laser projection and coaxial light source illumination, calculates the flatness deviation by using three-dimensional point cloud reconstruction and reference plane fitting, adopts sub-pixel edge detection and multi-section statistical measurement to quantize groove wear parameters, fuses the flatness and groove wear indexes to calculate a comprehensive wear index and output a grading maintenance suggestion, and automatically generates a detection report, thereby providing an objective quantitative basis for oil saw guide plate quality detection.

The invention discloses a portable cigarette packet microwave moisture meter based on a compensation algorithm, which belongs to the technical field of material moisture nondestructive testing and comprises a planar microwave moisture sensor module, an array pressure sensor module, a data processing terminal and a multi-sensor cooperative compensation algorithm module deployed in the data processing terminal. The planar microwave moisture sensor module is used for detecting the dielectric property of internal tobacco leaves through the outer package of the tobacco bale in a non-contact mode and outputting initial measurement data of moisture of the tobacco bale. The consistency of measurement conditions each time is guaranteed through the pressure sensor, the influence of uneven density distribution in the tobacco bales is effectively compensated through combination of multi-directional measurement and a dynamic weighting algorithm, the overall measurement precision and repeatability are remarkably improved, non-contact and nondestructive detection is achieved through the planar microwave sensor, the tobacco bales and tobacco leaves are not damaged, and the measurement accuracy is improved. The detection speed is high, and the on-site real-time requirement is met.

The invention discloses a low-temperature phase change material temperature field visualization test platform based on a schlieren method. The platform comprises a schlieren optical imaging system, a low-temperature Dewar and an image acquisition and processing system. In the schlieren optical imaging system, light emitted by a light source forms parallel test light beams through a beam expanding collimator, and the parallel test light beams penetrate through a low-temperature phase change material area in a sample cavity in a low-temperature Dewar system, then enter a convergent lens and form focusing light spots on a focal plane of the convergent lens; the blade is arranged at the focal plane and is used for partially cutting off a focusing light spot, so that light deflection caused by the refractive index gradient in the phase change material is converted into gray scale contrast change, and a schlieren image is recorded by the high-speed camera; and the image acquisition and processing system performs background correction, deflection angle calculation, refractive index gradient inversion, temperature gradient reconstruction and temperature field reconstruction on the schlieren image, and performs dynamic visual display. The invention provides a non-contact full-field visualization test means for researching low-temperature PCM phase change temperature field distribution and phase interface evolution.

This invention belongs to the field of flowmeter technology and discloses a method for optimizing the impeller of a turbine flowmeter. The method includes: S1: collecting data on the physical properties, operating range, and performance indicators of the medium through a system to establish clear design constraint data; S2: integrating streamlined and multi-lead design concepts, and determining the blade structural parameters through mathematical modeling and simulation analysis; S3: ensuring precise matching between the processing process and design objectives through parameter modeling, accuracy threshold setting, process coordination, and data linkage; S4: manufacturing an impeller prototype based on the processing technology, and calibrating the blade size and angle parameters using equipment; S5: verifying linearity and starting flow rate indicators through data acquisition and analysis, and iteratively optimizing design and processing parameters; S6: establishing a large-scale batch production process based on the optimized final parameters. This invention solves the problems of large starting flow rate, poor linearity, and insufficient consistency of metering accuracy in turbine flowmeters under low Reynolds number conditions.

This invention discloses an intelligent shoulder joint range of motion measurement system and method based on multi-sensor fusion, comprising a hardware measurement unit and a smart terminal communicatively connected thereto. The hardware measurement unit includes: a trunk sensor module for fixing to the user's trunk to acquire trunk posture data; an upper arm sensor module for fixing to the upper arm on the same side as the shoulder being measured to acquire upper arm posture data; and a data processing and communication module electrically connected to the trunk sensor module and the upper arm sensor module, respectively, for receiving and processing the trunk posture data and the upper arm posture data, calculating the spatial relative posture angle of the upper arm relative to the trunk, and wirelessly transmitting the spatial relative posture angle to the smart terminal. This invention addresses the long-standing pain points of traditional goniometers in clinical practice, such as strong subjectivity, cumbersome operation, and inability to record dynamic processes.

This invention discloses a method and system for discriminating and compensating for rust particle scattering in a dual-path colorimetric assay within the same pool, belonging to the field of water quality optical detection and colorimetric analysis technology. The method includes: S1, before adding the colorimetric reagent, acquiring the transmission signal and scattering signal before the reaction under a long optical path, calculating scattering characteristic parameters, and determining the rust particle scattering interference level; S2, selecting a long or short optical path based on the scattering interference level and a preset transmission lower limit threshold, and using an electromagnetic shutter to select the chosen optical path; S3, after adding the colorimetric reagent, mixing and performing a colorimetric reaction for a preset time; S4, acquiring the transmission signal and scattering signal after the reaction under the same optical path, calculating the differential absorbance and scattering change; S5, obtaining the corrected absorbance through scattering compensation; S6, converting the corrected absorbance into the target analyte concentration based on the calibration relationship corresponding to the selected optical path and outputting the result. This invention can reduce measurement deviations caused by rust particle scattering and expand its applicability.