47results about How to "High repeatable measurement accuracy" patented technology

A grating heterodyne interference auto-collimation measuring device mainly comprises a two-frequency laser, a 1/4 wave plate, a beam splitting system, a photoelectric conversion system, a polarization beam splitter, a reflector and a grating. The two-frequency laser emits two-frequency laser which passes the 1/4 wave plate and which then turns into two mutually-perpendicular linearly-polarized beams. The beams entering the beam splitting system are divided into three beams; one beam enters a reference light path photoelectric conversion system; last two enter a positive-negative gage beam polarization beam splitter. In the laser entering the polarization beam splitter, a reflected beam S is reflected to the grating by the reflector, and an incident angle is set into an auto-collimation angle of the corresponding diffraction order; through reference light information, horizontal and vertical displacements of the grating can be known. The auto-collimation right angle is set not depending on grating displacements. Therefore, the grating heterodyne interference auto-collimation measuring device is applicable to measuring horizontal large-travel displacement and vertical displacement.

The invention discloses a large free forging size online measurement device and method. The device is provided with, on two sides of a forging machine, a horizontal and a vertical motion unit, a laser cast-line method length measuring unit, a temperature-measurement edge searching method diameter online temperature measurement unit, a laser correlation telemetry diameter online measurement unit, a laser correlation telemetry diameter offline measurement unit, a laser beam cast-line method diameter visual inspection and early warning unit, and an operating machine position measurement unit installed on the operating machine. Each measurement unit is installed on the horizontal or the vertical motion unit, and is capable of horizontal or vertical motion. The projection laser beam method, the infrared temperature-measurement edge searching method and the laser correlation telemetry are used in the method to obtain the forging diameter, length, size and the forging contour in a horizontal section. The device and the method achieve online and offline measurement for the forging, enhance measurement functions and improve timeliness, accuracy and efficiency of the measurement.

The invention relates to a measuring device for measuring thickness of a large-sized sheet and a measuring method thereof. The measuring device comprises an angle base, a thickness measuring platform and a measurer, wherein the thickness measuring platform is provided with a positioning device; the positioning device comprises a fixing base arranged on the thickness measuring platform and a locking base arranged below the fixing base and fixedly connected with the fixing base; the fixing base is provided with a positioning hole running through the fixing base, a support mechanism is arranged in the fixing hole, the support mechanism comprises three spherical support faces extending out of an upper opening of the fixing hole, and the top points of the three spherical support faces form a support plane; and the locking base is also provided with a center hollow pipeline capable of vacuumizing the fixing hole, and the center hollow pipeline is communicated with a vacuum pump. The device adopts a positioning mode of three-point positioning support, thereby easily ensuring the positioning accuracy of the sheet and having good repeated measurement accuracy.

The invention provides a Gel capacitance sensor and method for measuring plantar pressure and dynamic change. The sensor comprises an insulating medium. Two ion gel arrays are pasted to the upper and lower surfaces of the insulating medium. A capacitor is formed by ion gel, the insulating medium, and ion gel. A layer of insulating medium is respectively pasted to the upper and lower surfaces of each of the ion gel arrays. Metal electrodes are pasted to the connection parts of the ion gel and the insulating mediums. An electron-ion gel mixed current loop is formed by the metal electrodes and the ion gel. A button battery, a control acquisition module and a Bluetooth module are integrated on a circuit board, the metal electrodes are connected through wires, and the button battery supplies power to the ion gel. When the surface pressure and period of the sensor are changed, a measurement signal is transmitted to the Bluetooth module, then a signal is sent to a mobile phone, and a mobile phone program carries out calculation to obtain plantar pressure distribution and change data with time. The gel material used by the capacitance sensor has the advantages of softness, transparency, small weight and thickness, easy processing, accurate measurement, low cost, and wide application.

The invention discloses a gel thin film array capacitor sensor and method for measuring total teeth dynamic occluding. A layer of ion gel as an electrode is pasted to upper and lower surfaces of an insulation medium respectively, and the upper ion gel is distributed in rows, the low ion gel is distributed in columns and the insulation medium is projected to the middle, the three are partially coincided to form a capacitor array; a layer of insulation medium is pasted to each of the upper and lower surfaces to avoid influence of an external stray capacitance, a row column scanning method is used to obtain capacitor signals at different sensing points to obtain a contacting sequence of each pair of teeth, occluding force during contacting and change along with time in all teeth occluding, the capacitor sensor has high precision and high flexibility, a high resolution means that slight force change can be measured, a new gel material is used to ensure accurate measuring of the dynamic occluding process under the condition of restoring the actual tooth occluding, and the material has good repeated measuring precision, and due to high transparency, the sensor can observe tooth change while transmitting an electric signal.

The invention relates to a method and a device for processing pulse wave signals and an electronic blood pressure measuring device. The pulse wave signal processing method comprises receiving pulse wave signals from a pressure sensor, and obtaining a plurality of pulse wave signal samples; and minimizing the whole noise in the pulse wave signal samples to de-noise the pulse wave signals. The pulse wave signal processing method comprises more particularly the steps of performing standardization treatment to give a value not greater than 1 for the pulse wave signal samples; setting initial gamma distribution parameters; performing the standardization treatment on gamma distribution values corresponding to the pulse wave signal samples; based on standardized sample values and standardized gamma distribution values, calculating sample noise values to evaluate the whole noise; judging if a ratio of the whole noise obtained by iteration for the current time to the whole noise obtained by iteration at last time is converged; and based on the convergence, judging corrected gamma distribution parameters; repeating the steps from the step of performing standardization treatment on the gammadistribution values to the step of correcting the parameters until judging that the whole noise is converged, and obtaining the optimized gamma distribution parameters for determining a pulse wave peak envelope curve of the minimized whole noise.

The invention relates to a positioning device applying to the thickness measurement of a large-size lamella, which comprises a fixed seat and a locking seat fixed under the fixed seat; wherein, the fixed seat is provided with a positioning hole running through the thickness of the fixed seat; the positioning hole is internally provided with a supporting mechanism; the supporting mechanism comprises three spherical supporting surfaces running out of the upper opening part of the positioning hole; the peaks of the three spherical supporting surfaces form a supporting plane; the locking seat is further provided with a central vacuum line for vacuumizing the positioning hole. By adopting surface contact to replace point contact between the lamella and the supporting mechanism, the lamella can be ensured to keep high parallelism opposite to a machine station after being placed on the positioning device at every time and the measuring accuracy of the lamella thickness can be ensured. By keeping the lamella to have high parallelism opposite to the machine station after being placed on the positioning device at every time, good repeated measuring accuracy can be ensured in every measurement.

The invention provides a method and a system for detecting a dynamic lift range of a gag bit of a common-rail oil injector and relates to the technical field of monitoring. The method comprises the following steps: S1) driving a displacement sensor and a detecting needle to detect an end face of the gag bit of a detected common-rail oil injector by controlling the motion of a driving device through an industrial personal computer; S2) controlling a sensing device to stop running by the industrial personal computer according to a trigger signal sent by the displacement sensor while sending a preset pulse width to an ECU (Electronic Control Unit) by the industrial personal computer, and controlling a high-low pressure driver to electrify the detected common-rail oil injector by the ECU according to the preset pulse width, when the end face of the gag bit is detected by the detecting needle; S3) collecting the displacement of the detected common-rail oil injector in real time by the displacement sensor according to a contact measuring mode of the detecting needle; S4) acquiring the lift range of the gag bit by the industrial personal computer according to the displacement, thereby finishing the detection. According to the method provided by the invention, the detection is performed under a dynamic state, so that the practical running working condition of the gag bit is met and the accuracy is high; the accuracy is higher due to the contact type detection of the detecting needle; the repeated detecting precision is high.

The invention discloses a fixture for ensuring accuracy of tests on chip-type ultra-low resistance product. The fixture comprises a base, the base is provided with a limit station and a bearing platform arranged side by side with the limit station, and the limit station is provided with the bearing platform of the same size with the limit station. The bearing platform is hollow, one side of the bearing platform is provided with upper and lower stop bolts, and the interior is provided with a spring. The top end of the bearing platform is provided with a connecting arm. One end of the connecting arm extends into the bearing platform and is connected with the bearing platform, and the other end of the connecting arm is provided with a probe carrying sheet. One side of the probe carrying sheet is provided with a four-wire probe. The fixture for ensuring accuracy of tests on chip-type ultra-low resistance product avoids the test inaccuracy caused by human factors such as test habits, intensity, and test point locations.

The invention discloses a ligament stiffness robot in-situ measuring system and method during an anterior cruciate ligament reconstruction surgery. The ligament stiffness robot in-situ measuring system includes a universal six-freedom-degree mechanical arm and an anterior cruciate ligament stiffness measuring device, and on the basis of transformation of space coordinates, the anterior cruciate ligament stiffness measuring device at the tail end of a robot interacts with a reconstructed anterior cruciate ligament in a leg of a patient in real time and laterally measures the stiffness of the reconstructed anterior cruciate ligament. In the past, ligament stiffness measurement is manually conducted by a doctor, and thus certain uncertainties exist. The ligament stiffness robot in-situ measuring system simplifies measurement difficulties for the doctor during the anterior cruciate ligament reconstruction surgery and assists the doctor in surgery operation, human interference factors are reduced, the surgery quality is improved, and implementation and popularization of precision medicine are facilitated.

A method for positioning a reading position in radial pressure detection of piston ring includes carrying out said detection repeatedly till accurate value is obtained in order to decrease error caused by deformation of strain window to raise detection accuracy. In said method, reading position is position that radial pressure value is changed from small to big and then changed to small again in following course of moving piston ring downwards, the moving height is decreased in following increase of moving frequency for raising operation efficiency.

The invention discloses a pneumatic clamp mechanism of a vertical type balancing machine. The pneumatic clamp mechanism comprises an operation panel, an air power switch, a duplex solenoid valve, a front swing frame, a rear swing frame and a motor fixation frame, wherein the motor fixation frame is provided with a servo motor, the power shaft of the servo motor is connected with a motor belt pulley, the motor belt pulley is connected with a main shaft belt pulley arranged on a main shaft through a synchronization belt, the main shaft is internally provided with an airway, the tail end of the lower portion of the main shaft is connected with a swivel joint, the air power switch and the duplex solenoid value are connected through an air pipe, the swivel joint is connected with the air pipe, the airway communicates with the air pipe, the upper end of the main shaft is provided with an expansion clamp and a front cylinder, and a reed plate is installed between the front swing frame and the rear swing frame. The structural design is ingenious, the automation degree is high, the performance is stable and reliable, the work efficiency is high, and the application is convenient.

The invention provides a rod length and cavity bottom thickness measuring machine of a constant-speed universal joint, and aims at solving the technical problems that measurement of the constant-speeduniversal joint has large errors and is inconvenient to operate in the prior art. According to the measuring machine, a measuring core rod and a thickness measuring mechanism is arranged on a pedestal, a length measuring mechanism is arranged on the thickness measuring mechanism, and a display displays parameters measured by the thickness measuring mechanism and the length measuring mechanism. Compared with measurement via a vernier caliper, the measuring efficiency is higher, the length and thickness are measured automatically by the measuring machine, errors caused by manual measurement canbe avoided, and the measuring precision of a workpiece is improved greatly.

The invention discloses an automobile door lock riveting point height measuring system and method based on a displacement sensor, and belongs to the technical field of automatic measurement. The system comprises an air cylinder, a programmable sequence control card, a displacement sensor, a data acquisition card and an industrial computer. The programmable sequence control card is used for controlling the air cylinder to push the displacement sensor to make contact with an automobile door lock. The displacement sensor is used for outputting a displacement value between the automobile door lock and the displacement sensor as an analog quantity signal. The data acquisition card is used for converting the analog quantity signal output by the displacement sensor into a voltage digital quantity signal. The industrial computer is used for processing the voltage digital quantity signal converted by the data acquisition card to judge whether the riveting point of the automobile door lock is qualified or not and displaying a judgment result. The system and the method are high in detection speed, have good repeated measurement precision, avoid personal errors caused by manual measurement, and are high in operation efficiency, strong in anti-interference capability and high in accuracy.

The invention relates to a device for measuring depth of a part in the assembly and manufacturing process of an automobile thermal bimetallic strip type temperature switch and a use method thereof. The device structurally comprises a dial gage, a measuring die, an opened copper sleeve, an adjusting screw, a zero setting flat block, a base core, a base sleeve and a spring, wherein the opened copper sleeve is embedded between the measuring die and a sleeve tube of a measuring rod of the dial gage, the measuring die is fixedly arranged on the dial gage through the adjusting screw, the spring is arranged in the base sleeve, the base core is arranged on the spring, and a temperature switch casing provided with a thermal bimetallic strip is arranged on the base core. The use method comprises the following steps of calibrating the dial gage by the zero setting flat block; during measuring, enabling the measuring surface of the measuring die to be in contact with the assembly reference surface of the temperature switch casing, and enabling a measuring head of the dial gage to be in contact with the upper surface of the center of the thermal bimetallic strip of the temperature switch; pressing the dial gage, driving the base core to press the spring, and enabling the temperature switch casing to be in elastic contact with the base core; and enabling the measuring surface of the measuring die to be in contact with the assembly reference surface of the temperature switch casing, so as to realize automatic alignment. The device and the use method have the beneficial effects that the automatic alignment is realized during measuring, and the measuring is accurate.