52results about How to "Guaranteed high precision measurement" patented technology

The invention discloses a high-accuracy remote absolute displacement measurement system based on optical fiber composite interference, which belongs to the technical field of optical measurement and is composed of a board band light source, an optical fiber isolator, three 3dB couplers, four auto-collimation mirrors, two optical fiber gratings, four reflectors, two detectors, a circulator, a one-dimensional translation platform, piezoelectric ceramics, a feedback control circuit, a signal generator, a signal treatment circuit, an analog to digital (A/D) conversion card, a computer and result output. The high-accuracy remote absolute displacement measurement system uses an optical fiber interferometer to induce displacement and another optical fiber interferometer to demodulate displacement to achieve remote measurement. The optical fiber interferometer for demodulation works in a low coherence interference state and a high coherence interference state, and amplitude of displacement can be determined by low coherence signals to achieve absolute measurement. A value of the displacement can be measured by high coherence signals to feed back and control effects of environment interference on the demodulating optical fiber interferometer, and high-accuracy measurement can be obtained.

A distributed POS (Position and Orientation System) sub-IMU (Inertial Measurement Unit) synchronous data acquisition system comprises a synchronous control/data receiving module based on FPGA (Field Programmable Gate Array), a high-speed asynchronous serial bus and a data acquisition/processing module based on ARM (advanced RISC machine), wherein the synchronous control/data receiving module based on FPGA realizes the control of time synchronization of a distributed POS system and receives data of a plurality of sub IMUs in real time; the high-speed asynchronous serial bus realizes communication between the master POS and sub IMUs at different measurement nodes; and the data acquisition/processing module based on ARM realizes parallel acquisition and real-time processing of the signal of a fiber-optic gyroscope, the signal of an accelerometer and the temperature signals of the gyroscope and the accelerometer. The distributed POS sub-IMU synchronous data acquisition system realizes real-time data acquisition of a plurality of sub IMUs of the distributed POS, reduces the size and power consumption of the sub IMUs, meets the requirement of miniaturization of the subsystem and simultaneously realizes time synchronization of the distributed POS system.

The invention discloses a laser thickness gauge for measuring the thickness of a battery pole piece. The laser thickness gauge comprises a measurement assembly and a wearing assembly. The measurement assembly comprises a position adjustor and a sensor arranged on the position adjustor, the battery pole piece is arranged on the wearing assembly, the sensor measures the thickness of the battery pole piece, and the measurement assembly spans the wearing assembly. Compared with the prior art, the laser thickness gauge has the advantages of high measurement precision and good stability.

The invention discloses a system and a method for the high-precision measurement direction sensing and rotary positioning of relative micro-rotation between two planes. Two gratings are arranged on the two planes to form two groups of measurement grating pairs. When the amount of relative rotation between the two planes is zero, grid lines of all gratings are in the same direction. Two groups of measurement grating pairs are opposite in the size relation of grating size but identical in period ratio. The number of fringes acquired by a measurement system is not less than 40. The method for measurement direction sensing and rotary positioning comprises the following steps of adopting the dimensions of fringe inclination angles obtained in the horizontal-vertical direction and two diagonal directions to obtain the directions of the fringe inclination angles. When two groups of interference fringes are identical in direction, rotary zero-point positioning is realized between the two planes, and when two groups of interference fringes are different in direction, relative rotation amount exists between the two planes.

The invention discloses an on-line measuring device for a fly ash carbon content of a flue, and belongs to the technical field of fly ash detection of boiler flues. The measuring device comprises a measuring probe and a measuring and analyzing unit, wherein the measuring and analyzing unit comprises a laser device, a spectrograph and control equipment; the control equipment is connected with the laser device and the spectrograph; the measuring probe comprises a housing, a laser focusing module and a spectral signal collection module; the laser focusing module and the spectral signal collection module are mounted in the housing; the laser focusing module is connected with the laser device; the spectral signal collection module is connected with the spectrograph; an opening of the housing of the measuring probe is formed in an inner wall of the flue; a gas blowing device is arranged on the edge of the opening of the housing; gas blown out by the gas blowing device forms a gas curtain; and focusing areas of the laser focusing module and the spectral signal collection module are located in the flue on the outer side of the gas curtain. The measuring device solves the problem that fly ash blocks a sampling gun due to the fact that the fly ash is required to be taken out of the flue by the sampling gun.

A measurer applying Twyman-Green interferometer structure is featured as having light source, setting collimation extender system, beam-splitter, light chopper and plane reflector bound on piezoelectric ceramics in sequence on th same optical axis; setting optical fibre connector at one end of beam splitter and lens as well as detector on another end, connecting detector to computer through A/D converter and connecting computer to the piezoelectric ceramics through driving circuit.

A meter-scale grating diffraction wave-front splicing detection device and a detection method are disclosed. The device comprises a Fizeau interferometer and an interferometer standard lens, and is characterized by further comprising an electronically-controlled air floating translation table, a two-dimensional adjustment object stage, a control system, and a computer, wherein the two-dimensional adjustment object stage is fixed to the electronically-controlled air floating translation table, the output end of the control system and the control end of the electronically-controlled air floating translation table are connected by a cable, the control system and the Fizeau interferometer are connected to the computer by data lines, the angle at which a meter-scale grating to be detected is placed is equal to the diffraction angle of the meter-scale grating to be detected, and the center height at which the meter-scale grating to be detected is fixed to the two-dimensional adjustment object stage is the same with the center height of the interferometer standard lens. The invention provides an effective means of detection for meter-scale gratings, and the test diameter of the original Fizeau interferometer is expanded. The meter-scale grating diffraction wave-front splicing detection device and the detection method have the characteristics of low cost, simple structure and high precision, and have great engineering application value.

The invention belongs to the field of strabismus measurement devices, and particularly relates to a human eye strabismus direction and strabismus degree measurement device. The device comprises an eyetracker, a controller, a processor and VR glasses; the controller is used for controlling an indicator to move, so that human eyes wearing the VR glasses are in a natural staring state on the indicator in the glasses; then left and right side pictures of the VR glasses are alternately closed; the eye tracker is used for shooting pupil pictures of the closed side before and after each closing; andthe processor is used for judging whether the pupil of the human eye on each side moves or not and determining the moving direction based on the pupil pictures, corresponding to the side, before andafter closing. In addition, the controller also closes a main eye picture when the human eyes are in the natural staring state on the target indicator, and meanwhile rotates a strabismus eye picture according to the strabismus direction, so that the target indicator is located in the direction where the pupil of a strabismus eye faces, and the total rotation angle is the strabismus degree. The device is not affected by subjectivity of a subject, the staring degree and the cooperation degree are high, and the measurement result is reliable.

The invention discloses a method for high-precision measurement of the sphericity of the micro-spherical probe of a nanometer three-coordinate measuring machine. A tungsten probe with large length-to-diameter ratio and a quartz tuning fork are combined. Scanning probe heads with nanometer-level resolution are constructed based on a precision micro stage. During measurement, the two scanning probe heads are driven by the micro stage to scan the large-section contour of a microsphere in the x-axis direction in a differential manner. Radial error generated in the scanning process can be automatically eliminated in a differential manner, and thus, accurate parameters of the large-section contour of the microsphere can be obtained. After the microsphere is rotated a certain angle, the measurement is repeated to acquire multiple sets of parameters of the large-section contour. A three-dimensional spatial contour of the microsphere is constructed through fitting according to feature points obtained. The geometric parameters of the microsphere are calculated based on the three-dimensional spatial contour. Thus, high-precision measurement of the sphericity of the microsphere is realized. The method has the characteristics of small measuring force, wide measuring range, and high measuring precision.

The invention provides a full-automatic current comparator based on an FPGA and a voltage control current source. The full-automatic current comparator high-voltage bridge comprises the components of a voltage divider, a high-voltage power supply, the FPGA, a first analog input module, a second analog input module, an RT, an industrial personal computer, a voltage control current source, an analog output module, a programmable amplifier, a current comparator and a tested sample. The current comparator comprises a testing coil, a first proportional coil and a second proportional coil. The testing coil and the programmable amplifier are used for testing the balance degree of the current comparator. The two proportional coils with fixed numbers of coils are respectively connected with the tested sample and the voltage control current source. Comparative current measurement of the sample current is realized according to an ampere turns balance principle. The full-automatic current comparator high-voltage bridge based on the FPGA and the voltage control current source can realize measurement on capacitance and loss factor of a capacitive tested sample and measurement on inductance and quality factor of an inductive tested sample in a high-voltage condition.

The invention discloses a back reflection structure digital X-ray crystal orientation device and an X-ray detector thereof. The X-ray detector comprises a scintillation screen, a fiber optic taper, a photosensitive element, a digital circuit board, a heat conduction element and a ray collimator, wherein a center through hole extending to the back side of the scintillation screen from the front side of the scintillation screen is formed in the scintillation screen, the fiber optic taper is connected to the back side of the scintillation screen, the photosensitive element is connected to the back side of the fiber optic taper, the rear end of the photosensitive element is connected to the front surface of the digital circuit board, the heat conduction element is connected to the rear surface of the digital circuit board and conduct heat conduction on the photosensitive element, the rear end of the ray collimator is connected to the emission end of an X-ray machine, and the front end of the ray collimator extends to the front side of the scintillation screen from the center through hole. By the adoption of the back reflection structure digital X-ray crystal orientation device and the X-ray detector thereof, orientation analysis precision and efficiency can be improved remarkably.

The invention discloses an automatic lifting locking mechanism. The automatic lifting locking mechanism comprises a support, a first connecting rod, a second connecting rod, a lifting driving mechanism, a lifting table and upper locking mechanisms; the two ends of the first connecting rod and the two ends of the second connecting rod are hinged to the support and the lifting table, and the projections of all hinge shafts in the vertical plane perpendicular to the hinge shafts are located at the four corners of a virtual parallelogram; the lifting driving mechanism is arranged on the support, and the movable end is connected to the first connecting rod or the second connecting rod or the lifting platform; and the upper locking mechanisms comprise positioning pin driving mechanisms arrangedon the support, positioning pins are arranged at the movable ends of the positioning pin driving mechanisms, at least two sets of upper locking mechanisms are arranged, at least one positioning pin isperpendicular to the remaining positioning pins, positioning holes matched with the positioning pins are formed in the lifting table, and after the lifting table is lifted, the positioning pins are inserted into the corresponding positioning holes. The automatic lifting locking mechanism has the advantages that a radar lifting mechanism can provide a stable working platform, and it is ensured that a radar can conduct high-precision measurement.

The invention discloses a low-power-consumption tilt angle sensor based on the NBIOT Internet of Things, and relates to the technical field of sensors. The low-power-consumption tilt angle sensor comprises a shell and a mounting plate, the shell and the mounting plate are fastened through bolts to clamp a measured piece 15, and a power storage module, a charging module, a control module, a sensor measurement module and a communication module are arranged in the shell separately. An acceleration sensor for measuring inclination angle changes is arranged in the sensor measuring module, a plane plate parallel to the XY plane of the acceleration sensor is fixed to the lower portion in the shell, a plurality of pressure-sensitive induction blocks which are evenly distributed are fixed to the lower portion of the plane plate, and the pressure-sensitive induction blocks are symmetrically distributed in the X direction and the Y direction of the acceleration sensor. The lower portion of each pressure-sensitive induction block is connected with an ejector rod through a spring. The tilt angle sensor can be used for a long time in various environments, is convenient to install, keeps high-precision measurement, especially outdoors, and can be widely applied to the fields of bridges, unmanned aerial vehicles, ships and the like.

The invention discloses a three-point cylindricity measuring device and a cylindricity error separating method based on a V-shaped block, which are used for measuring the cylindricity of a cylindricalmeasured object. The device is characterized in that the measured object takes an outer cylindrical surface in the axial direction as guide rails, and the V-shaped block is used as an axial sliding measurement rack; sensors are arranged on the V-shaped block; the sliding measurement rack is supported by the outer cylindrical surface of the measured object by using V-shaped surfaces of the V-shaped block; the V-shaped block moves according to the axial direction of set intervals to obtain corresponding measurement positions of the measured object; on the measurement positions, the measured object is driven by a rotary supporting shaft system of the measured object to rotate for one circle, the circumferential position of the V-shaped is kept unchanged, and the V-shaped surface of the V-shaped block is kept in contact with the outer cylindrical surface of the measured object. The three-point cylindricity measuring device and the cylindricity error separating method disclosed by the invention are especially applied to cylindrical profile measurement reconstruction; portable large-sized cylindrical profile in-situ measurement can be realized; the measurement is irrelevant to an in-situ rotary supporting shaft system and in-situ guide rails, and full-harmonic separation of all error motions in the measurement process is realized at the minimum quantity of sensors, so that high precision of cylindrical profile measurement reconstruction is ensured.

The invention discloses an electronic transformer of an electric energy meter. The electronic transformer comprises a housing and a current connecting piece. An electromagnetic induction component isinstalled in the housing and includes a notched high-permeability magnetic core; a coil winds around the notched high-permeability magnetic core; a tunnel magneto-resistive chip is mounted on the notch of the notched high-permeability magnetic core and is connected with the coil by a circuit; the coil is connected to the main circuit board by a circuit; and the current connection piece passes through the notched high-permeability magnetic core. Therefore, the high-precision measurement of the current can be kept without being affected by the power factor. The influence errors on the direct current and even-order harmonics in the AC line are extremely low.

The invention discloses a digital display type Michelson interferometer automatic measurement system and method. The system comprises a fine tuning handwheel driving apparatus, an interference ring measurement apparatus, a control digital display host, a Michelson interferometer and an interference fringe observation screen, wherein the fine tuning handwheel driving apparatus clamps a fine tuning handwheel of the Michelson interferometer to drive the fine tuning handwheel to rotate synchroneously to enable a moving mirror of the Michelson interferometer to go forward or backward; the interference ring measurement apparatus is arranged on the interference fringe observation screen and is connected with the fine tuning handwheel driving apparatus; and the control digital display host is connected with the fine tuning handwheel driving apparatus. The system provided by the invention is exquisite and reasonable in structure and convenient to use, satisfies the requirement of a Michelson interferometer for stable operation during work, ensures measurement precision of the Michelson interferometer and also has the advantages of wider application, higher cost performance and the like compared to similar products.