46 results about "Measurement repeatability" patented technology

The invention discloses a size laser measurement device and method for metal plugging slide block processing, and relates to the technical field of laser measurement. The size laser measurement device and method for metal plugging sliding block processing comprise a measurement table, a guide rail and a sliding seat which are installed on the measurement table and used for clamping and placing a metal plugging sliding block to be measured, an electric telescopic rod, a supporting piece, a guide plate and a clamp, and the measurement table is provided with a measurement assembly used for measuring the size of the metal plugging sliding block. The measuring assembly comprises a three-dimensional laser scanner which is located above the measuring table and can carry out circumferential movement to carry out annular scanning on the metal plugging sliding block so as to measure the size; the three problems of reflection interference, blind area shielding and flow complexity in online measurement of the high-reflection metal part are effectively solved, the uniformity of repeatability and function correlation is improved, and the measurement repeatability is changed from depending on physical placement consistency to depending on data reference consistency.

The invention provides a system and a method for detecting the mechanical property of a micro area of a composite material structure, and belongs to the technical field of material mechanical testing equipment. Comprising a fixing base and testing equipment, a clamping device is arranged in the fixing base and used for fixing a tiny test piece, force generated by the testing equipment is transmitted to the tiny test piece, a pressing disc is arranged in the testing equipment and controlled by a servo motor to move, and force is applied to the tiny test piece fixed in the clamping device; and an improved short beam shearing method is adopted for interlayer shearing performance testing. The bottleneck problem in the aspect of testing the interlayer shear strength of the composite material in a specific small area in the current composite material industry is solved, an important testing means is provided for research and development of the composite material, and experiments prove that the measurement repeatability error of the system is smaller than 2%, the standard requirement is completely met, and the system has a wide application prospect.

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.

A contact type displacement sensor with high stability and accuracy comprises a probe assembly and an outer shell, and a grating code ruler assembly, a linear motion guide assembly and a PCBA circuit board are arranged in the outer shell. The grating code ruler assembly comprises grating glass and a grating support. The grating glass is installed on the grating support, and a plurality of transparent lines and opaque lines are formed on the grating glass. In conclusion, the pin is adopted to replace traditional threaded connection to achieve rigid positioning of the grating code ruler assembly, accumulative errors caused by assembly gaps and vibration are effectively eliminated, and the movement stability and the measurement repeatability are remarkably improved by combining a low-friction matching structure of the guide sliding groove and the pin; according to the overall structure, the assembly process is simplified, the abrasion risk of long-term use is reduced, high-stability and high-precision continuous displacement detection can be achieved in a complex industrial environment, and the strict requirement for measurement reliability in the precision manufacturing field is met.

An upper limb lymphedema multi-point accurate measuring device comprises a vertical flexible rule which is provided with longitudinal scale marks in the length direction, and the longitudinal scale marks are used for recording the fixing position of a transverse flexible rule; a plurality of transverse flexible rulers, wherein each transverse flexible ruler is connected to the vertical flexible ruler in a sliding manner; one end of the transverse flexible rule is fixedly connected with the vertical flexible rule through a magic tape; the vertical flexible rule and the transverse flexible rule are respectively provided with a winding device which is used for respectively recovering the vertical flexible rule and the transverse flexible rule from an unfolded state to a wound state; transverse scale marks are arranged on the transverse flexible rule and are used for measuring perimeter data; an adhesive material is arranged on the back face of the vertical flexible ruler and used for being attached to the upper limb of a patient so as to keep the stability of the measuring position. According to the utility model, the problems of inconsistent positioning of measurement points, sliding displacement of the device, poor measurement repeatability and complex operation in the measurement process are effectively solved.

The application relates to the technical field of free-tryout die technology, and discloses a free-tryout die for a wind power blade manufacturing process and a die closing method, which adopts a measuring device to form repeatable measurement, has good measurement precision, omits the tryout die process during measurement, has high measurement efficiency, good measurement repeatability, and further improved practicality, and comprises a die reference base device, a measuring device and a data collection and calculation system, wherein the die reference base device comprises a fixed bottom die base and an opening and closing top die base, the fixed bottom die base and the opening and closing top die base are rotationally connected with each other, an opening and closing die driving assembly is arranged between the fixed bottom die base and the opening and closing top die base, the fixed bottom die base and the opening and closing top die base are respectively provided with SS-face die cavities and PS-face die cavities, the measuring device comprises a movable support, the movable support is slidably connected with the fixed bottom die base, an electric telescopic rod is arranged on the fixed bottom die base, and the telescopic rod of the electric telescopic rod is connected with the movable support.

Disclosed is a method for testing and / or operating a roll-to-roll machine comprising a floating unwinder and an edge position sensor attached thereto, and a floating rewinder with an edge position sensor attached thereto.

The application discloses a kind of pneumatic high-precision inductance displacement sensors, belongs to geometric quantity calibration field.The application includes probe head assembly, guide assembly, reset component, coil assembly, pneumatic assembly;Probe head assembly is installed at the bottom of guide assembly, and carries out spherical surface contact with the measured piece;Guide assembly realizes the function of guiding and air tightness;Spring force generated by reset component makes guide rod not rotate along axial movement, guarantee that standard probe head and measured surface are in full contact, and realize high-precision reset;Coil assembly converts displacement into inductance, realizes the output and conversion of displacement;Pneumatic assembly forms air cavity, guide rod moves upward when external gas supply, guide rod moves downward under the action of reset component after external gas supply is disconnected.The application is a kind of automatic reciprocating motion, high-precision, suitable for automatic measurement inductance displacement sensor, in 0~100 μm micro-displacement high-precision measurement, measurement repeatability reaches 10nm.

This invention discloses an integrated active spectral stabilization system and method for a desktop high-resolution X-ray emission spectrometer, belonging to the field of precision spectral analysis. The system includes: a single-unit thermal capacity main base with an integrated temperature-controlled flow channel, serving as a unified physical and thermal reference; optical components rigidly mounted directly on the base; a module supporting active vibration isolation of the base; and a closed-loop feedback subsystem consisting of a beam position sensor, a micro-motion compensation mechanism, and a controller. The method includes: establishing global thermal balance and active vibration isolation of the base; calibrating the optical path and recording the null position; real-time monitoring of the reference beam position; and dynamically locking the optical path by using a closed-loop drive micro-motion mechanism to compensate for the crystal angle based on the drift amount. This invention solves the long-term drift problem caused by modular assembly and passive stabilization in desktop high-resolution X-ray spectrometers, achieving long-term subelectron volt-level energy stability under conventional laboratory conditions, significantly improving measurement repeatability and reliability.

The utility model discloses a bearing play measuring mechanism, its through the original structure of rotary power unit integrated push rod drive stator connecting foot, combines the three point graduation measurement algorithm of opposite clamping measurement unit, completely subverts traditional manual detection mode. The detection time is greatly shortened, and the measuring efficiency is improved, and the high -speed production line rhythm is directly matched, and the measurement repeatability precision of opposite clamping measurement unit is high, and the micron level play change is captured accurately, and the equipment utilizes the stator shell original connecting foot as the driving fulcrum, saves the special rotary clamp and makes the manufacturing cost reduce, and the maintenance -free design can reduce the downtime loss, provides high reliable, low -cost, full -automatic quality guarantee foundation for motor intelligent manufacturing.

The invention relates to a method and device for automatically measuring and calculating buoyancy and buoyancy center axial coordinates of an underwater vehicle, and aims at solving the problems that traditional manual measurement is tedious in operation and low in precision. The method comprises the following steps: injecting water into the water tank to overflow the mounting rack; hoisting the empty frame, inputting the weight and center-of-mass coordinates of the aircraft in the air, collecting the measurement values of the weighing sensors at four corners, and calculating the distance from the frame weight and the center-of-mass to the rear sensor; the sensor value is collected for the second time after the aircraft is installed, and the distance value is obtained through the laser range finder; and finally calculating buoyancy and buoyancy center axial coordinates based on a moment balance formula. The sensor automatically collects data, the controller intelligently calculates, full-process automatic measurement and calculation are achieved, and operation is easy, convenient and rapid; manual observation and recording errors are eliminated, and the measurement repeatability is high; by combining a high-precision sensor and a moment balance principle, the result is accurate and reliable, and the method is suitable for multiple scenes of research, development, production and maintenance.

The invention discloses a subspace joint parameter estimation algorithm for constructing an analytic signal based on Hilbert transform in high-precision multi-surface phase-shift interference, belongs to the technical field of high-precision optical interference measurement, and aims to solve the problems of inaccurate frequency estimation caused by spectrum leakage and a fence effect in a traditional algorithm. And the problem that a modern spectrum estimation algorithm cannot directly process real-value light intensity signals is solved. The method comprises the following steps: firstly, performing Hilbert transform on a real-value light intensity sequence to construct an analysis signal; then, a Hankel matrix is constructed based on the analysis signal, and subspace decomposition is carried out; further, taking the obtained high-precision frequency as prior information, and performing joint correction on the amplitude and the phase by using a double-section phase difference correction method; and finally, reconstructing the surface topography according to the corrected phase. According to the invention, the limitation of spectrum leakage and the like is overcome, the joint fine positioning of frequency, amplitude and phase is realized, and the precision, robustness and measurement repeatability of interference parameter demodulation are obviously improved.

The invention provides a calibration method of a human body trace element analyzer, which comprises the following steps: checking the appearance and normality of a to-be-detected analyzer, configuring a measuring range corresponding to the to-be-detected analyzer, and preparing a standard solution according to a preset proportion; carrying out first preset times of measurement by adopting at least three standard solutions with different preset proportions so as to calibrate the concentration indication error of the to-be-detected analyzer; a standard solution with the concentration being 50% of the measuring range of the to-be-detected analyzer is adopted for measurement for a second preset number of times, so that the measurement repeatability of the to-be-detected analyzer is calibrated; and according to the measurement principle of the to-be-detected analyzer, performing continuous measurement for a third preset number of times by adopting a standard solution with a preset concentration so as to calibrate the detection limit of the to-be-detected analyzer.

The invention discloses a reference circle positioning mandrel for an involute internal gear and an involute internal spline, and relates to the technical field of involute gear measurement. The problems that a gear measuring instrument or three coordinates are adopted for detecting the reference circles of the involute internal gear and the internal spline in the prior art, the actual production requirement cannot be guaranteed in the measuring time, only several reference circle points can be selected for measurement in the measuring process, and the measuring accuracy cannot be protected are solved. The tapered roller bearing comprises a tapered mandrel, a retainer formed by printing through the 3D technology, positioning steel balls, a first check ring and a second check ring. The first check ring and the second check ring are installed at the two ends of the taper mandrel, and the holder is installed on the taper mandrel and moves between the first check ring and the second check ring. A certain number of semispherical cavities are arranged in the involute ribs of the retainer, and positioning steel balls used for measuring an M value are mounted in the semispherical cavities. According to the positioning mandrel, all gears are considered in the measurement process, and the measurement repeatability and the measurement result are more accurate.

The application discloses a kind of multi-point thermal field adaptive temperature control methods for oil water cut calibration, it is related to thermal field temperature control technical field, for solving the problem that measurement result is difficult to keep measurement repeatability, by the temperature data of different height positions of the sample to be measured under controlled temperature rise condition acquisition, based on temperature gradient feature recognition oil phase, emulsification zone and the temperature stratification interface formed by water phase, and interface upper and lower boundary is used as section division basis, calculate temperature rise lag index, analyze emulsion thickness variation, obtain interface sedimentation rate, based on temperature rise lag index and interface sedimentation rate construct stratified emulsification coefficient, for determining sample emulsification state and water cut error deviation direction, and generate water cut correction coefficient, by stepper motor to the quantitative discharge of stratified section Directional compensation is carried out, and calibration reference is obtained in combination with section, to improve the measurement accuracy under the condition of oil-water interface instability.

The invention discloses an automatic focusing Brillouin scattering spectrum measurement system, which relates to the field of spectrum measurement, and comprises a laser used for emitting laser for exciting Brillouin scattering; the Brillouin light path system comprises a reference light path, a forward scattering light path and a backward scattering light path and is used for guiding the laser to a sample and collecting scattering signals, and the Brillouin light path system has the following measurement modes: a forward scattering measurement mode in which the laser enters the sample through the forward scattering light path; by integrating the automatic focusing system and the three-dimensional motion mechanism, the closed-loop control of the sample position in the Brillouin scattering spectrum measurement process is realized, the photoelectric sensor is used for detecting the maximum value of the axial light intensity to lock the focal plane, and the CCD image analysis is combined to realize the radial accurate positioning, so that the focusing precision is effectively improved, and the measurement precision of the Brillouin scattering spectrum is improved. The measurement repeatability and the data reliability are remarkably improved, meanwhile, the refocusing time after sample adjustment is effectively shortened, and the anisotropic crystal polycrystal orientation spectrum collection efficiency is greatly improved.

This application provides a five-axis measurement and evaluation method for wheel-type tenon grooves, relating to the field of wheel-type tenon groove measurement technology. After the wheel is clamped, a wheel coordinate system is established. Based on the nominal position and orientation of the tenon groove, a nominal coordinate system for the tenon groove is established, and correction measurement points are collected on the working surface to be measured. The initial coordinate system of the tenon groove is obtained by correcting it according to the least squares criterion. A high-density point cloud is obtained by five-axis oscillation scanning and fitted to the actual working surface. The nominal corner points are projected onto the actual working surface to obtain the measured corner points. The coordinate system is corrected using the least squares method for corner point deviation. The oscillation-fitting-correction process is iterated until the change in coordinate system between two adjacent iterations is less than 10% of the tolerance bandwidth, thus obtaining the measured coordinate system of the tenon groove. Geometric tolerances such as center point position, axial / radial tilt, and angle are calculated in the wheel coordinate system to complete the machining quality evaluation. This method reduces the accumulated error of the reference structure and improves the accessibility and measurement repeatability of oblique tenons.

The application discloses a gravity and gravity gradient integrated measuring device and method based on atomic interference, and the measuring device comprises a Raman laser emitter and a structural framework. Raman laser emitted by the Raman laser emitter passes through an upper atomic interferometer and a lower atomic interferometer in sequence and then is vertically incident on a Raman laser reflector. The bottom of the Raman laser reflector is fixedly connected with the top of a seismometer through an adapter, and the structural framework is installed on a rotating platform. The measuring method comprises the following steps: firstly, the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient are determined; at a new measuring point, the orientation angle of the measuring device is adjusted to the orientation angles corresponding to the maximum value and the minimum value of the gravity gradient; the original gravity measurement value of the upper atomic interferometer, the original gravity measurement value of the lower atomic interferometer and the original measurement value of the gravity gradient are obtained and corrected. The measuring repeatability problem caused by the Coriolis error in the measuring process is effectively solved.

The invention discloses an integral active spectrum stabilization system and method of a desktop high-resolution X-ray emission spectrometer, and belongs to the field of precise spectrum analysis. The system comprises a single heat capacity main base which is integrally formed and internally provided with a temperature control flow channel and serves as a unified physical and thermal reference; an optical assembly directly rigidly mounted on the base; the module is used for supporting the base to actively isolate vibration; and the closed-loop feedback subsystem consists of a light beam position sensor, a micro-motion compensation mechanism and a controller. The method comprises the steps that base global heat balance and active vibration isolation are established; calibrating a light path and recording a zero position; monitoring the position of the reference beam in real time; and a micro-motion mechanism is driven to compensate the crystal angle according to the drift distance in a closed-loop manner, and a light path is dynamically locked. According to the invention, the problem of long-term drift of the desktop high-resolution X-ray spectrometer caused by module assembly and passive stability is solved, sub-electron volt-level long-term energy stability in a conventional laboratory environment is realized, and the measurement repeatability and reliability are remarkably improved.

The invention provides a spectrum acquisition module and device for simultaneously detecting pungency degree and color value of chili powder, relates to the technical field of agricultural product detection devices, solves the problems of poor measurement repeatability and low efficiency caused by manual switching of optical filters in multi-index detection in the prior art, and provides an innovative scheme. The module comprises an ultrasonic vibration compaction unit which is integrated on a sample cup bracket and is used for carrying out standardization treatment on a powder sample before spectrum acquisition; a light splitting element is arranged in the optical detection unit, a fluorescence signal emitted by a sample is separated into two beams, the two beams are respectively guided into two independent detection channels, and each channel is provided with a special optical filter and a detector, so that parallel and synchronous acquisition of a plurality of indexes such as pungency degree and color value is realized; a central processing unit cooperatively controls the whole automatic detection process. According to the invention, high-repeatability and high-efficiency automatic synchronous detection of the powder sample can be realized.

A protective member (126) for an optical measuring device, such as a broken beam tool setting device (2) for a machine tool, is described. The protective member (126) comprises a duct (140) through which light and air can pass. The duct (140) is configured such that, in use, a light beam passes through the duct along an optical axis (O) and an air flow is directed out of the duct along an airflow axis (A). The optical axis (O) is not parallel to the airflow axis (A), and the duct (140) has a varying cross-sectional profile along the airflow axis (A). Improved measurement repeatability is provided.

The invention discloses a high-precision hydrogen sulfide analysis and detection tube, a high-precision hydrogen sulfide analysis and detection device and a high-precision hydrogen sulfide analysis and detection method, and relates to the technical field of natural gas sampling and analysis, the high-precision hydrogen sulfide analysis and detection tube comprises a detection tube body, a plurality of capillary tubes are arranged in the detection tube body, and each capillary tube adopts a silicide coating and is filled with micron-sized HgCl2 impregnated silica gel. The amount of substance and molar mass of hydrogen sulfide are measured according to the color-changing length of the detection tube body, and the concentration of a to-be-measured component is measured according to the volume and mass, so that the problems of wide and fuzzy color-changing interface, no pressure resistance, fragility, poor suction sample introduction measurement precision and the like caused by adsorption and large inner diameter in the existing detection tube method for measuring hydrogen sulfide in natural gas are solved; and the measurement repeatability and accuracy are improved.

The application relates to a turbine flow sensor test analysis method and device, an intelligent flow measurement device, a computer device, a storage medium and a computer program product. The method comprises the following steps: obtaining instrument coefficients measured by a turbine flow sensor at different caliber water flow standard devices; calculating average instrument coefficients of the turbine flow sensor at different caliber water flow standard devices at the same flow point; calculating measurement repeatability and average instrument coefficients at corresponding flow points; calculating comparison control values at each measurement point according to the average instrument coefficients of the turbine flow sensor at different flow points; and analyzing the performance of the turbine flow sensor according to the values. The turbine flow sensor can be accurately tested and analyzed.

The invention relates to the technical field of high-voltage direct-current transmission equipment monitoring, and discloses a high-voltage direct-current converter valve cooling system pressure sensor lifting device and method.The method includes the steps that a gradient stress ring and an electric field shielding cover are arranged, and the fringe effect is restrained from the physical level; after field installation, pre-pressurizing processing is carried out to optimize a pressure conduction path, and a two-step data compensation algorithm is adopted: an original digital signal is corrected by using a nonlinear edge effect compensation model established based on a maximum deviation feature point; a precise pressure value is calculated through a linear basic relation model, a compensation coefficient self-adaptive updating mechanism is further included, through periodic field calibration, coefficients of an edge effect compensation model are only pertinently updated when the measurement deviation exceeds the limit, and therefore precise compensation is conducted on long-term drift on the premise that the basic characteristics of the sensor are not changed. According to the invention, physical suppression is combined with an adaptive algorithm, so that the full-period service measurement repeatability and environmental adaptability of the sensor are improved.

The application discloses a kind of round runout detection devices of shaft, including shaft body support, shaft body support, height adjusting mechanism and dial gauge;The shaft body support has two, is connected installation rail respectively, shaft body support is installed on each, one of the shaft body support side is equipped with driving motor;The shaft body support is symmetrically provided with a pair of support rollers along center line, and the two ends are matched with the shaft body support;Positioning sliding block is connected on the installation rail, and the top is installed dial gauge;The height adjusting mechanism is arranged between two shaft body supports, and the top surface is respectively connected with two shaft body supports.The height-adjustable shaft body support of the present application cooperates with the height adjusting mechanism, solves the problem that the traditional device is difficult to adapt to different diameter shaft parts, improves the convenience of clamping and measurement repeatability;Dial gauge is flexibly moved on installation rail by positioning sliding block, realizes multi-point, arbitrary position detection along axis, overcomes the defects of single measurement point and limited coverage of traditional fixed dial gauge.

The invention relates to the field of testing, and provides an automatic testing device and method for a junction box. The junction box automatic testing device comprises a robot arm, a mobile switching tool, a visual detection module and an industrial control host. According to the automatic test device for the junction box, through visual detection of global positioning and local fine tuning and in combination with millimeter-level motion precision of a robot arm, the alignment error between a probe and a target point is extremely small, meanwhile, a pressure detection module feeds back a contact state, a test error caused by too loose or too tight contact is avoided, and the test efficiency is improved. And the measurement repeatability of the on resistance and the insulation resistance is greatly improved, and the high-precision test requirement of the junction box of the motor train unit is particularly met.

The invention discloses an electricity testing device for an intelligent power distribution system, and particularly relates to the technical field of electricity testing of power distribution lines, which comprises a track adjacent to an electricity testing area and a trolley directionally moving along the track. According to the invention, the track guides the trolley to accurately move to a fixed position adjacent to the electricity testing area, and the space position and contact pressure of the probe and the electricity testing point of the tested equipment are kept consistent during each electricity testing, so that the measurement repetition precision is improved; the mode that the first sleeve block and the second sleeve block are separated and attached is adopted, the wiping contact state can be completed under the condition that the structure of the insulation terminal is not interfered, a circular track structure is formed after attaching, and the probe rotates around the center of the insulation terminal in the circumferential direction; through cooperation with axial sliding of the linear guide rail, the probe achieves full-coverage detection on the insulation terminal in the circumferential direction and the axial direction, a detection blind area is avoided, stable contact force is provided by the second electric push rod during electricity detection each time, it is ensured that contact pressure is constant, and the stability and reliability of electricity detection results are improved.

The application belongs to the technical field of neutron scattering, and particularly relates to a dynamic range improvement and background suppression integrated collimation / beam blocking device and method. Through integrated collimation and multi-stage beam blocking collaborative design, the parasitic background caused by Fresnel diffraction and edge scattering is reduced. Through a closed-loop tracking compensation mechanism, the beam center deviation caused by thermal drift and mechanical drift is reduced, the low-q region artifact risk is reduced. Through the replaceable absorber cassette, multi-working-condition quick switching is realized, the high-throughput and high-dynamic-range measurement requirements are considered, through the sample environment module local shielding and opening angle collaborative optimization, the additional scattering introduced by extreme environments such as high temperature and high pressure is reduced, through the dynamic mask reconstruction process, the effective data retention rate in the low-q region is improved and the measurement repeatability is improved. It simultaneously realizes that the background in the low-q region is significantly reduced, the baseline stability is improved, the beam blocking coaxial relationship can still be maintained under the condition of slow beam drift, and the error of the reconstruction system is reduced.

The invention relates to the technical field of power equipment monitoring, and discloses an integrated detection method, system and equipment of an oil chromatography online monitoring device, and the method comprises the following steps: obtaining standard oil monitoring data of the oil chromatography online monitoring device in a transformer substation, and calculating a measurement error and measurement repeatability; acquiring monitoring data of the on-line monitoring device on the oil samples with different concentrations, and taking the concentration value of the oil sample meeting the condition as the minimum detection concentration; the measurement error, the measurement repeatability and the minimum detection concentration are compared with different threshold values respectively, and whether the oil chromatography online monitoring device is qualified or not is judged; wherein the threshold values are adjusted on the basis of the initial set value, and the adjustment amount is related to the type of the detected object, is in positive correlation with the voltage grade of the transformer substation, and is in positive correlation with the difference value between the historical monitoring data mean value and the initial set value. The method can adapt to influences caused by changes of manufacturers, models and the like of the oil chromatography online monitoring device, and the function detection precision of the oil chromatography online monitoring device is improved.

The application discloses a current probe with a flexible pre-contact structure and a contact force control method thereof, and the current probe comprises a tubular shell, a measurement probe head, a flexible pre-contact structure and a driving control module, the flexible pre-contact structure comprises a flexible contact head, a sliding sleeve, a force spring and a force sensing module, and is used for flexibly contacting a measured point and sensing a contact force in real time before the measurement probe head contacts; the driving control module comprises a micro driver and a control unit, the driving control module calculates an accurate displacement amount required for the measurement probe head to extend in real time according to the sensed contact force data through a calculation model, and drives the micro driver to execute the displacement, so that the measurement probe head contacts the measured point with constant and tiny optimal pressure, and the application effectively solves the technical problems that a traditional contact probe is easy to damage a fragile measured point, the contact resistance is unstable, and the measurement repeatability is poor through the probe contact process of sensing first and contacting later.