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88results about How to "Large measuring range" patented technology

Method for measuring liquid-drop contact angle on solid surface and device thereof

ActiveCN101539502AHigh measurement accuracyLarge measuring rangeSurface/boundary effectInvestigating moving fluids/granular solidsCcd cameraInjector
The invention relates to a method for measuring a liquid-drop contact angle on a solid surface and a device thereof, which are used for measuring the contact angles of the liquid drops with different mediums and different sizes on the solid surface. The method comprises the following steps of: according to one-to-one correspondence between a liquid drop volume and a liquid drop contact angle, obtaining a plurality of liquid drop profiles which correspond to different contact angles, thus establishing a database used for storing different liquid drop profiles; when in measuring, fixing a sample on an earthquake isolation platform, and dropping the liquid with known volumes on the surface of the sample by utilizing a micro-injector; after the liquid drops achieve balance, acquiring a liquid drop image on the surface of the sample by utilizing an optical imaging system, a CCD camera and a computer; utilizing an image matching method to carry out processing and analyzing to the shapes of the liquid drops by computer software, and then carrying out calculation to obtain contact angles of the liquid drops; and matching the liquid drop profiles obtained by experimental measurements with the liquid drop profiles in the database so as to determine the corresponding contact angles. Compared with the existing method, the method takes the influence of volume and weight of the liquid drop in to consideration, thus improving the measuring precision.
Owner:TSINGHUA UNIV

Co-phasing control device and control method for spliced telescope

The invention relates to a co-phasing control device and control method for a spliced telescope.The device comprises a spliced telescope body, a first beam splitter, a wavefront detector, a second beam splitter, a translation error detector and a wavefront controller, wherein the first beam splitter receives emergent rays and generates first divided beams and second divided beams; the wavefront detector detects the first divided beams and obtains system aberration data and wavefront distortion aberration data of transmission paths of all spliced sub mirrors; the second beam splitter receives the second divided beams and generates third divided beams and fourth divided beams; the translation error detector detects the third divided beams and collects dispersion interference fringes between each pair of spliced sub mirrors; the wavefront controller is connected with the wavefront detector, the translation error detector and a driver of a secondary separating deformable mirror.By means of the co-phasing control device and control method for the spliced telescope, real-time detection and compensation and correction of translation, inclination and higher order aberration can be effectively achieved, and compared with the technology in a current similar system, better accuracy and instantaneity are achieved.
Owner:SHANGHAI ASTRONOMICAL OBSERVATORY CHINESE ACAD OF SCI

Device and method for measuring long stroke displacement based on Hall effect

The invention belongs to the technical field of physical parameter measurement and relates to a device for measuring long stroke displacement based on the Hall effect. The device comprises a single chip microcomputer, a constant current source, a signal processing circuit, an analog-to-digital converter and a sensor array, wherein the sensor array is at least one group of linear hall sensors; each group of the linear hall sensors are uniformly and linearly arranged on a PCB (Printed Circuit Board); the space between the adjacent linear hall sensors is not less than the size of a magnet on a magnetic float in the arrangement direction of the sensor array; the differential outputs of the linear sensors are multiplexed with two differential voltage signal transmission lines through an n-channel analog multiplexer; the two differential voltage signal transmission lines are connected with an input interface of the signal processing circuit; the two adjacent PCBs are connected through an expansion interface; and each group of the linear hall sensors are powered by one same constant current source in a time sharing manner. The device has the advantages of low power consumption, fewer adopted devices, convenience in maintenance and lower cost.
Owner:杨会峰

Load-sharing piezoelectric multi-dimensional force measuring device and method for manufacturing the same

InactiveCN103175636ALarge measuring rangeAssembly technology requirements are lowForce measurement using piezo-electric devicesMeasurement deviceMultiple dimension
The invention discloses a load-sharing piezoelectric multi-dimensional force measuring device and a method for manufacturing the same, belongs to the field of piezoelectric sensors, and particularly relates to a testing device. The testing device is required for measuring force in three directions, and ranges of the force in the three directions are similar, and are of ten-thousand Newton classes. The method includes reasonably arranging a plurality of expansion pins on the periphery of a piezoelectric three-directional force sensor, and designing the expansion pins with different diameters so as to implement different load-sharing ratios; enabling the four expansion pins which are uniformly distributed to expand under actions of four taper pins so that a base can be tangentially and rigidly connected with an upper cover plate, and sharing load of force acting on the upper cover plate; and enabling the load-sharing ratios to be adjustable. The load-sharing piezoelectric multi-dimensional force measuring device comprises the base, the piezoelectric three-directional force sensor, the upper cover plate, the four expansion pins, the four taper pins, four set screws and a pre-tightening screw. The load-sharing piezoelectric multi-dimensional force measuring device and the method have the advantages that a testing application range of the piezoelectric multi-dimensional force measuring device is broadened by the method, and the load-sharing piezoelectric multi-dimensional force measuring device is wide in application space in fields of machining, aviation and aerospace.
Owner:DALIAN UNIV OF TECH

Direct current power supply insulation detection device and detection method

The invention discloses a direct current power supply insulation detection device and detection method. The detection device includes a voltage detection module, a pair of balance bridge resistors, and a pair of detection bridge resistors, and also includes a current detection module used for detecting the sum of currents of the pair of balance bridge resistors during single-pole grounding insulation resistance value detection and detecting the sum of the currents of the pair of detection bridge resistors and current of each of the pair of detection bridge resistors during dual-pole grounding insulation resistance value detection; and a calculation module used for acquiring leakage current and calculating the single-pole grounding insulation resistance value according to grounding voltages of direct-current positive and negative buses and the acquired leakage current during single-pole grounding insulation resistance value detection, and acquiring leakage current and calculating the dual-pole grounding insulation resistance value according to the grounding voltages of the direct-current positive and negative buses and the acquired leakage current during dual-pole grounding insulation resistance value detection. By implementation of the technical scheme of the direct current power supply insulation detection device, the cost is low and the precision is high.
Owner:深圳市奥特迅科技有限公司

Composite measurement system and measurement method for micro-array complex surface optical element

ActiveCN103983205AFast measurementLarge measuring rangeUsing optical meansScanning probe microscopySelf inductionPhysics
The invention provides a composite measurement system and measurement method for a micro-array complex surface optical element. The composite measurement system is composed of a white light interference micro-structure test system, a self-induction tuning-fork atomic power microscopy measurement head, a scanning and displacement platform, a nanometer measurement machine controller and a piezoelectric ceramic controller, wherein the white light interference micro-structure test system is formed by sequentially connecting an optical microscopy interference system, a digital CCD camera and an image capture card; the self-induction tuning-fork atomic power microscopy measurement head is fixed to the white light interference micro-structure test system; the scanning and displacement platform is located below the self-induction tuning-fork atomic power microscopy measurement head and used for holding samples to be tested; the nanometer measurement machine controller and the piezoelectric ceramic controller are respectively and electrically connected with the scanning and displacement platform. The output end of the white light interference micro-structure test system is electrically connected with a PC machine, the output end of the self-induction tuning-fork atomic power microscopy measurement head is electrically connected with the PC machine through a high-speed digital signal processing servo feedback control system, the output end of the piezoelectric ceramic controller is further electrically connected with the nanometer measurement machine controller, and the input end of the piezoelectric ceramic controller is electrically connected with the PC machine through the high-speed digital signal processing servo feedback control system. Multi-information sensing and data fusion are achieved.
Owner:TIANJIN UNIV

Total station networking measurement method of large-scale structural component

The invention discloses a total station networking measurement method of a large-scale structural component, and belongs to the technical field of industrial measurement. The measurement accuracy in the prior art is low. The total station networking measurement method comprises the steps of before measurement is carried out, enabling a main station total station and an auxiliary station total station to be arranged on the two sides of the to-be-measured large-scale structural component, determining a main station user coordinate system, determining a plurality of reference points at the positions, located between the main station total station and the auxiliary station total station, of the periphery of the large-scale structural component, enabling the reference points to be brought into the main station user coordinate system, enabling six or more of the reference points to serve as station setting reference points, measuring the coordinate values of the station setting reference points, enabling the station setting reference points to be capable of being simultaneously measured by the auxiliary station total station, establishing an auxiliary station user coordinate system according to the station setting reference points, enabling the main station total station and the auxiliary station total station to respectively measure and record the coordinate values of the other reference points, and obtaining conversion parameters according to a parameter coordinate conversion equation. When measurement is carried out, data measured by the main station total station direct serve as measurement results, data measured by the auxiliary station total station serve as measurement results after coordinate conversion is carried out, and measurement on the whole large-scale structural component is completed.
Owner:CHANGCHUN UNIV OF SCI & TECH

Experimental facility for testing autoignition temperature of gas in high-pressure oxygen-enriched environment

InactiveCN102928457AEasy to operateLarge measuring rangeInvestigating phase/state changeOxygen enrichmentHigh pressure oxygen
The invention relates to an experimental facility for testing the autoignition temperature of a gas under a special dangerous (high-pressure oxygen-enriched) condition. The experiment facility comprises a gas supply part, a temperature-controlled heating part, a reactor part, a safety interlocking device and a PC (Personal Computer), wherein the reactor part comprises a cylinder body and a flange plate which are sealed; and 6 pipelines are distributed on the flange plate and are respectively used for vacuumizing, pressure detection, temperature detection, stirring, electromagnetic valve evacuation and being used as a safety valve. When the temperature raises by more than 20DEG C sharply, the sample burns; and when the safety valve trips out, the gas autoignites or deflagrates. According to the experimental facility, the autoignition temperature data is obtained by adjusting the system pressure and continuous temperature rise under the sealed condition, automatically recording the temperature data and judging whether the autoignition happens, the measuring conditions of the autoignition temperature are broadened; and the experimental facility disclosed by the invention is simpler to operate and realizes computer automation of experimental operation and data recording.
Owner:CHINA PETROLEUM & CHEM CORP +1

Large scale atomic gate nanometer measuring device

InactiveCN101358831AAdapt to the needs of processing technologyLarge measuring rangeUsing electrical meansElectric/magnetic contours/curvatures measurementsElectricityMicroscope
The present invention discloses a large-scale atom-lattice nanometer measuring device, and comprises a multi-level shock-absorption system and a base, and is characterized in that a combined shock absorption terrace that is arranged on the base is provided with a nanometer feeding working terrace, and the movable nanometer feeding working terrace is provided with an atom lattice, and the nanometer feeding working terrace drives the atom lattice to move; a probe on a scanning tunnel microscope is arranged above the atom lattice, and the probe is driven by a piezoelectric ceramic driving device to move; a signal collector is connected with the scanning tunnel microscope; a pulse circuit converts the analog signal into a pulse signal to trigger the counter to count the number, and then is inputted into a computer to be processed. The measuring device greatly increases the measuring range and adapts to the requirements of the nanometer component processing technology; the maximum range on the direction of X is 20 mm, and the maximum range on the direction of Y is 20 mm; the nanometer measurement can be performed both on the direction of X and the direction of Y; the measurement range is decided by the maximum distance of the nanometer feeding working terrace.
Owner:CHONGQING UNIV OF TECH

Relative laser shock strength characterization method

The invention relates to the field of laser processing and manufacturing, in particular to a relative laser shock strength characterization method which is realized by utilizing laser to shock on a single pendulum bob. The relative laser shock strength characterization method is used for guiding laser shock forming, laser shock processing and measurement of working states of a laser system so that the optimum shock effect of laser shock processing can be achieved. The method includes the steps of adopting a high-power pulse laser to shock on the pendulum bob through a reflector path system and to enable the pendulum bob to obtain impulse, measuring the laser shock strength according to the impulse of the pendulum bob and measuring the laser shock strength of targets made of different materials under a unified standard, and utilizing laser shock relative strength coefficients to characterize the diversity of different laser shock strength effects. Consequently, laser shock strength characterization is achieved. Meanwhile, the stability and continuity of the working states of the laser system can be measured through laser impulse, and on this basis, parameters of the laser work system can be adjusted. Through the relative laser shock strength characterization method, operation is convenient, accuracy is high and the use effect is good.
Owner:JIANGSU UNIV

Continuous laser three-dimensional scanning method and device based on Gresham's law hinge principle

The invention discloses a continuous laser three-dimensional scanning method and device based on a Gresham's law hinge principle. The device comprises a laser, a reflecting mirror, a receiving telescope, a photoelectric detector and a signal synchronous circuit, wherein the reflecting mirror, the receiving telescope and the photoelectric detector placed according to the Gresham's law; the reflecting mirror is arranged on the crossing point of the object plane, the phase plane and the focal plane and can rotate for an angle; the signal synchronous circuit controls the photoelectric detector to follow the rotation synchronous upward and downward displacement of the reflecting mirror and always conforms to the Gresham's law; an adjustable reflecting mirror is put in front of the diode laser; the reflecting mirror reflects the laser to a target object in the environment and then reflects or reflects out a light signal; the light signal is received by the receiving telescope group; the light signal received by the receiving telescope can be gathered onto the photoelectric detector. The method and the device provided by the invention are applicable to prospective large-range object three-dimensional scanning; the rotating reflecting mirror and the upward and downward flat moving detector scanning imaging method is used; the continuous light scanning is realized; the high-precision and clear scanning image of an object in a remote position can be obtained.
Owner:广州光和光科技有限公司

Resistance measurement circuit and resistance measurement device

The present invention discloses a resistance measurement circuit and a resistance measurement device. The resistance measurement circuit comprises: a data collection module comprising a to-be-measuredresistor connection end, a reference resistor connection end and a data signal output end, and configured to collect currents or voltages of a resistor to be measured and a reference resistor, wherein the to-be-measured resistor connection end and the reference resistor connection end are electrically isolated with the output end, and an input end, the output end and the power source are isolatedto one another; and a measurement module connected with the data signal output end and configured to measure the current or the voltage output by the data signal output end to measure the resistancevalue of the to-be-measured resistor. The data collection and the data measurement achieve electrical isolation to apply different voltages or currents or output different voltages or currents at thesame time and select reference points according to the physics and mathematics definition of the resistor so as to reduce the differential mode interference, the common mode interference and the noiseinterference, greatly facilitate resistance measurement, extend the measurement range, effectively reduce the measurement errors and improve the measurement precision.
Owner:于创宇

Projectile explosive charge expansion pressure simulation test system and method

The invention discloses a thermal expansion pressure simulation test system and method for simulating warhead projectile explosive charge. The system comprises a charge simulation chamber, an expansion pressure sensor assembly, a sealing compaction nut, an explosive member, a constant temperature system, a temperature compensating fiber grating, a fiber demodulation system and a measurement control system. Projectile body explosive charge and semisolid state explosive thermal expansion pressure can be directly measured. An explosive test piece is arranged in a simulation chamber cylinder, theexplosive test piece is compacted by the expansion pressure sensor assembly, sealing compaction is exerted onto the expansion pressure sensor assembly, the simulation chamber cylinder is further sealed to form a simulation test projectile, the simulation test projectile is disposed in the constant temperature system, and projectile explosive charge thermal expansion pressure change is measured. The system is advantaged in that operation is simple, the measurement scope is large, measurement accuracy is high, good safety is realized, and a technical problem of direct measurement of projectile body explosive charge and semisolid state explosive thermal expansion pressure is solved.
Owner:XIAN MODERN CHEM RES INST

Acceleration measurement device and data acquisition method based on range switching

The invention relates to an acceleration measurement device and a data acquisition method based on range switching. The acceleration measurement device comprises an accelerometer, a range switching module, a first signal preprocessing module, a second signal preprocessing module and a signal processing and control unit. The accelerometer acquires acceleration information. The range switching module is connected with the first signal processing module or the second signal processing module according to a control signal and transmits the acceleration information to the first signal processing module or the second signal processing module. The first signal preprocessing module and the second signal preprocessing module respectively preprocess the acceleration information. The signal processing and control unit compares the preprocessed acceleration information with a preset value and generates the control signal to be transmitted to the range switching module. If the acceleration information is greater than the preset value, the range switching module is controlled to be connected with the first signal preprocessing module; and if the acceleration information is less than the preset value, the range switching module is controlled to be connected with the second signal preprocessing module. Different acceleration measurement requirements can be met.
Owner:TECH & ENG CENT FOR SPACE UTILIZATION CHINESE ACAD OF SCI

Hole diameter measuring method based on staggered combination of laser trigonometry displacement sensors

A hole diameter measuring method based on staggered combination of laser trigonometry displacement sensors comprises steps as follows: two laser trigonometry displacement sensors are adopted and assembled in a parallel-staggered manner to form a measuring system; in a measuring range of the measuring system, the measuring system is arranged on one side in a to-be-measured hole, that is, the measuring system is located in a semicircle of the to-be-measured hole; measuring is started as follows: the measuring system is moved to another semicircle of the to-be-measured hole in the direction perpendicular to emergent rays of the laser trigonometry displacement sensors, and continuous sampling and recording are performed in the movement process; the maximum value of the sum of measuring values of the laser trigonometry displacement sensors at the same moment during continuous sampling is taken and is substituted into a formula for the hole diameter of the to-be-measured hole, and the diameter of the to-be-measured hole is obtained. Problems in the prior art are solved, and the measuring range of the whole measuring system is greatly enlarged through staggered placement of the double laser trigonometry displacement sensors, so that a smaller hole diameter can be measured with the method.
Owner:TIANJIN UNIV

Non-contact three-dimensional automatic scanning testing system

The invention discloses a non-contact three-dimensional automatic scanning testing system, and the system comprises a positioner, a portal frame, a robot, a measurement workpiece, and a data processing control system. The positioner comprises two supports and a rotating clamping device. The portal frame comprises two X-axis moving guide rails for a walking mechanism, two Y-axis moving support columns, and one Z-axis moving cross beam. The tops of the Y-axis moving support columns are provided with the Z-axis moving cross beam, and the Z-axis moving cross beam is provided with a moving guide rail and a robot installation support. The robot installation support is provided with a flange seat, and a robot is fixedly installed on the flange seat. An end part of the robot is provided with a 3Dscanning measurer. The 3D scanning measurer comprises a camera and a projector, and the data processing control system comprises a robot control cabinet, an electrical control cabinet, and a PLC operating system. The robot control cabinet is electrically connected with the robot. According to the technical scheme of the invention, the travel control range can be enlarged, and the measurement precision and detection efficiency are improved. The system timely collects, processes and displays the measurement data, and can meet the requirements of various angles, precisions and speeds of differentworkpieces, and can be widely used for online application.
Owner:苏州艾弗伦智能技术有限公司

Torsion angle measuring device and method based on utilization of polarization principle

The embodiment of the invention discloses a torsion angle measuring device and method based on utilization of a polarization principle. The torsion angle measuring device based on utilization of the polarization principle comprises a polarized light emitting module and a torsion measuring module, wherein the polarized light emitting module is used for generating polarized light, and the torsion measuring module is positioned in front of the polarized light emitting module and used for receiving the polarized light, generating an electric signal corresponding to the light intensity and outputting torsion angle measurement data. The polarized light emitting module comprises a light source, a collimating lens and a first polarizing film, and the torsion measuring module comprises a second polarizing film, a rotating motor, an axial angle encoder, an objective lens and a photoelectric detector. The torsion angle measuring device based on the utilization of the polarization principle is simple in structure, software and hardware and high in integration level, high precision and wide range of torsion angle measurement are achieved at the same time, and the measuring method is simple andeasy to implement.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI

Y-type double-FBG (fiber Bragg grating) optical fiber vibration sensor for online monitoring hydraulic decoking of coking tower

ActiveCN104236471AHigh response frequencyLarge measuring rangeUsing optical meansEngineeringResponse Frequency
The invention discloses a Y-type double-FBG (fiber Bragg grating) optical fiber vibration sensor for online monitoring hydraulic decoking of a coking tower. The Y-type double-FBG optical fiber vibration sensor comprises a vibration guide rod (2), a heat-radiating structure (3), a Y-type vibrating member (4), a sealing shell (5), a counterweight body (6), fiber Bragg gratings and a connecting base (1) supporting the whole sensor, a contact probe (10) at the left end of the vibration guide rod closely contacts with the wall of the coking tower, the heat-radiating structure is fixed on the vibration guide rod, the sealing shell is assembled on a fixing member (11) at the right end of the vibration guide rod through a screw port, the counterweight body and the Y-type vibrating member are positioned in the sealing shell, the first fiber Bragg grating is led out from one end of the Y-type vibrating member and then fixed on the sealing shell, and the second fiber Bragg grating is led out and pre-stretched from the other end of the Y-type vibrating member and then fixed on the sealing shell. The Y-type double-FBG optical fiber vibration sensor has the advantages of high response frequency, wide measuring range, safety in nature and the like, and can collect high-frequency vibrating signals generated when high-pressure water strikes the wall of the coking tower in the process of hydraulic decoking so as to complete hydraulic decoking process.
Owner:CHINA PETROLEUM & CHEM CORP +1
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