33results about How to "Large calibration range" patented technology

The invention discloses a vidicon calibrating method based on double one dimensional drones; the method includes the following steps: two freely arranged one dimensional drones are set; the images of the drones are shot from different angles through a vidicon; vidicon coordinate systems and image plane coordinate systems of the vidicon under different shooting positions as well as a world coordinate system are respectively built; internal parameters and external parameters of the vidicon are solved after carrying out aberrance calibrating on the shot drone images. The calibrating method of the invention takes two one dimensional drones as a calibrating object, carries out shooting on the drone images from different angles after freely arranging two one dimensional drones on the field area of the vidicon and can carry out calibrating on the internal parameters and the external parameters of the vidicon only after picking up three or more characteristic points of each drone image; auxiliary devices are not needed; the vidicon calibrating method based on double one dimensional drones of the invention is simple to operate, and can improve the calibrating precision of the vidicon and enlarge the calibrating range of the vidicon.

The invention discloses a capacitance mismatch calibrating circuit and calibrating method applied to a single-end SAR ADC (Successive Approximation Analog-to-Digital Converter). By using the method, error caused by capacitance mismatch of the SAR ADC can be calibrated. According to the method, only two pairs of redundant capacitance need to be inserted in an analog domain for compensation of capacitance mismatch in a digital domain. A binary capacitance DAC (Digital-to-Analog Converter) containing two pairs of redundant dot capacitance includes a segmentation binary capacitance DAC and redundant capacitance Cjr+, Cjr- inserted to the lowest bit of aN MSB segment of a segmentation capacitance, and redundant capacitance Cqr+, Cqr- inserted to an LSB segment. A redundant bit calculation module adds the inserted redundant bits to other normal bits and obtains N-bit valid output. A capacitance mismatch calibrating module performs compensation to capacitance mismatch on the output result. Compared with the traditional SAR ADC structure, only two pairs of redundant capacitance are added. The calculation of mismatch compensation is performed in the digital domain, so that the layout size and analog circuit complexity is reduced.

The invention discloses a computer vision cube calibration based three-dimensional measurement method including the steps: preparing a cube and pasting black and white mark templates (each of the templates comprises a combined pattern of a large black and white square and three small black squares) on the surfaces of the cube; acquiring internal references of a video camera by means of calibration of a calibration plate; extracting an image pair, and computing the calibration cube to obtain external references of the video camera so that calibration of the video camera is completed; performing characteristic point recognition and match for obtained images; and finally, computing three-dimensional coordinates and practical recovery lengths of key points. The three-dimensional measurement method is simple to operate and low in cost, measurement results can be obtained in real time, and application range of three-dimensional measurement is widened.

The present invention provides gas calibration method for semiconductor equipment. After certain amount of gas is introduced through mass flowmeter to closed chamber, the pressure change before and after gas introduction is measured and inside gas mass change is calculated based on the gas state equation, so as to judge whether the mass flowmeter has normal operation. Compared with available technology, the present invention has the advantages of wide calibration range, fast calibration, low cost and excellent calibration effect.

The invention relates to a photoelectric response characteristic calibration method for a two-dimensional imaging device, which comprises a ray diffraction grating, a focusing optical system, a two-dimensional imaging device to be calibrated and a computer system, wherein an incident light beam for calibrating the two-dimensional imaging device is a light beam parallel to the plane, the light beam is imaged on the photosensitive surface of the two-dimensional imaging device after being modulated by the space intensity of the ray diffraction grating and being converged by the focusing optical system, the incident light beam forms a series of diffraction sub light spots with modulated light intensity on the photosensitive surface of the two-dimensional imaging device through the beam splitting characteristic of the ray diffraction grating, a plurality of groups of measured data are fused through peak value measuring data of each diffraction sub light spot and peak value theoretical dataobtained by theoretical calculation, the measured data and the corresponding theoretical data are obtained, the two groups of data are combined for completing the photoelectric response characteristic calibration of the two-dimensional imaging device. The photoelectric response characteristic calibration method has high light energy utilization rate, is applicable to the photoelectric response characteristic calibration of the two-dimensional imaging device under the condition with strong light sources and is also applicable to weak light sources, and the calibration range is enlarged throughthe fusion of a plurality of groups of measured data.

The invention belongs to the technical field of optical fiber measurement, and particularly relates to a calibration device for optical coherence polarization measurement and a dynamic range calibration method thereof. The device comprises a broadband optical source and power monitoring device 510, a first optical fiber connector 521, a second optical fiber connector 522, a high-precision calibration device 530, an optical path correlator 540, and a polarization crosstalk detection and signal recording device 550. A polarization-maintaining optical fiber with a specific length and an alignment angle is used for building a calibration device, and the position and the magnitude of a measurement peak are precisely positioned; by using two-order interference peaks of multiple crosstalk points, a low peak value is precisely positioned; and by using different calibration gradients, the calibration precision and the accuracy are improved.

The invention relates to a method for calibrating misalignment angles of a two-dimensional autocollimator. The method comprises the following steps: (1) rotating azimuth angles and pitch angles of a reflecting mirror to determine pixel numbers, azimuth angles and pitch angles (x, y, h, v) in the horizontal direction and the vertical direction corresponding to m*n points; performing fitting on the m*n points by using multiple curved surfaces to obtain corresponding coefficient matrixes of the azimuth angles and pitch angles, and for any point in an imaging region, resolving the azimuth angle and the pitch angle of the point according to the pixel numbers x and y in the horizontal direction and the vertical direction of the point and the coefficient matrix of the azimuth angle and the pitch angle. The method provided by the invention is flexible to use, the fit maximum number of times and the number of measuring points can be continuously changed according to a calibration result until the requirement on the calibration accuracy is met, and moreover, the higher the fitting times is, the more the measuring points are, and the higher the calibration accuracy is.

The invention discloses a magnification factor calibration method for a microscope. The magnification factor calibration method comprises the following steps of: with a standard raster with a known raster pitch as a reference, acquiring a raster image in a microscope to be calibrated; carrying out fast Fourier transform on the acquired image to obtain a spatial frequency spectrum; selecting an interval where certain level of resonant frequency is located from the spatial frequency spectrum, and carrying out local high-resolution discrete Fourier transform to obtain a local high-resolution spatial frequency spectrum; selecting a frequency with a maximum amplitude as a resonant frequency from the local high-resolution spatial frequency spectrum, and dividing the resonant frequency by the level to obtain a base frequency; calculating the size of the standard raster corresponding to the image by using the raster pitch and the base frequency; and calculating the magnification factor of the microscope by using a ratio of the display size of the image to the size of the standard raster corresponding to the image. Compared with the traditional method, the magnification factor calibration method is high in precision, large in calibration range and wide in applicability when being used for calibrating the magnification factor of the microscope.

The invention relates to a fringe effect based capacitance type micro inertial sensor with self-calibrating. The existing sensor having the self-calibrating function is small in calibrating range. Sensor blocks are rectangular silicon wafers etched with grid-shaped wells; four corresponding ends are connected with anchor points through silicon supporting beams; the four corresponding ends are correspondingly provided with rectangular silicon strips in the same number; comb type silicon strips which are connected with the sensor mass blocks, fixed detection silicon strips, grid-shaped electrodes and grid-shaped aluminum electrodes on the surface of a substrate are formed into detection capacitance. When acceleration speed signals are loaded in the mass block sensitive directions, silicon strip groups on the sensor mass blocks cut electric field lines of substrate fringe electric fields and then the substrate fringe capacitance is changed; the size of the loaded acceleration speed is detected due to detection of the capacitance change of the micro inertial sensor. The existing sensor having the self-calibrating function has the advantages of increasing vibrator quality, reducing pull-in and brown noise, increasing detection capacitance and reducing pressed film air damping.

The invention provides a device for calibrating space charge density measurement equipment, and the device comprises a power supply, an upper electrode plate, a lower electrode plate, insulating supporting columns, an arc light lamp, a galvanometer, a platform, and a fan. The positive and negative electrodes of the power supply are respectively connected with the lower and upper electrode plates through wires, and the lower and upper electrode plates are supported by the insulating supporting columns. The galvanometer is disposed on a wire between the negative electrode of the power supply and the upper electrode plate. The arc light lamp is disposed at the edge of the lower electrode plate, and the fan is located above the arc light lamp. The platform of the space charge density measurement equipment is placed between the upper electrode plate and the lower electrode plate. The device is clear in principle, is simple in structure, is low in manufacture cost, is safe and convenient for use, is large in calibration range, and is suitable for the calibration of different types of space charge density measurement equipment. The device is mainly used for the calibration of the space charge density measurement equipment based on an ion counting method, a Faraday cage method, a charge screening method and a probe array method.

The present invention discloses an impact test system based on an integral Hopkinson rod PVDF sensor. The invention belongs to the technical field of PVDF sensor test calibration, specifically, relates to an impact test system based on an integral Hopkinson rod PVDF sensor. The present invention is to solve the problem that existing split Hopkinson rods can only calibrate one PVDF sensor per shockpulse, for example, multi-sensor simultaneous calibration will result in uneven distribution of shock pulse signal and short calibration range. An impact test system based on an integral Hopkinson rod PVDF sensor consists of an integral Hopkinson rod, a PVDF sensor test assembly, and a signal acquisition system. The integral Hopkinson rod is a one-piece structure. The PVDF sensor test assembly isthreaded to the sample to be tested of the integral Hopkinson rod. The impact test system based on integral Hopkinson rod PVDF sensor has simple structure and can simultaneously calibrate multiple batches of PVDF samples.

The invention discloses an automatic joint calibration device and method for a laser radar and a camera, and the method comprises the steps: controlling a movable track to move, enabling a rotatable support to be located at a preset point position, and controlling the rotatable support to change the rotation posture, so as to enable a moving part to change the direction. Acquiring image frame data and point cloud frame data in each direction of the moving part until a preset number is acquired; performing camera internal reference calibration based on the acquired image frame data; pixel coordinates of four vertexes on the outmost periphery of the calibration plate are obtained through calculation based on image frame data; point cloud calibration points are extracted to obtain final point cloud coordinates of four vertexes on the outermost periphery of the calibration plate; solving the transformation relation between the pixel coordinates of the four vertexes on the outermost periphery of the calibration plate and the final coordinates of the point cloud, obtaining a rotation matrix and a translation matrix, and completing the joint calibration of the laser radar and the camera. According to the invention, convenient, rapid and high-precision linkage calibration of the laser radar and the camera is realized.

The invention discloses a calibration device and calibration method of a water-bathing method crack growth signal. The calibration device is applied to calibrating a crack growth signal of a crack monitoring instruction based on a DC potential fall method. The calibration method comprises the following steps: importing constant current at two ends of a metal conductor, collecting a voltage difference signal of the metal conductor under twice temperature, and calibrating the voltage difference signal as the crack growth signal with of the corresponding crack growth length according to a conclusion that the voltage difference signal can be used as an analog crack growth signal about 1mm crack growth of a 304 steel sample when the temperature of the metal conductor is 1 DEG C increased. The localization progress of the related instrument is accelerated, an efficient, simple and fast calibration device and method are provided for verifying the function and precision of the instrument, a relation between the 304 steel crack length and the measurement voltage signal is published, the applicable range of the instrument can be popularized in an acceleration way, and the calibration devicehas the advantages of being simple in structure, stable in performance, repeated in use and intelligent in control.

The invention discloses a device for calibrating crack expansion signals in a water bath method. The device comprises a base, a metal conductor, a fan, a vacuum flask and a temperature control devicewhich is capable of setting and displaying the temperature of water in the vacuum flask and giving an alarm when the temperature of the water exceeds the set temperature, the vacuum flask comprises aflask body and a flask cap positioned on the upper portion of the flask body, a temperature sensor used for measuring the water temperature of the flask body and a heating resistance wire used for heating water in the flask body are arranged on the inner wall of the flask body, and the temperature sensor, the heating resistance wire and the fan are all connected with the temperature control deviceand are controlled to work by the temperature control device. According to the device for calibrating crack expansion signals in a water bath method in the invention, the localization process of related instruments is accelerated, an efficient, simple and rapid calibration device is provided for verifying the functions and precision of the crack monitoring instrument, the relation between the length of the 304 steel crack and the measurement voltage signal is disclosed, accelerated promotion of the application range of the instrument is facilitated, and the advantages of being simple in structure, stable in performance, capable of being repeatedly used and intelligently controlled, and the like are achieved.

The invention discloses a six-dimensional force / torque sensor calibration device and calibration method. The device comprises a calibration work bench, wherein two ends of the calibration work bench are respectively provided with a supporting rod, upper ends of the supporting rods are provided with pulleys, the pulleys on the two supporting rods are parallelly arranged, the calibration work benchis movably provided with a sensor base used for fixing a six-dimensional force sensor, the sensor base is detachably connected with a load loading rod, two ends of the load loading rod are respectively provided with a connection hole used for fixing a load loading rope, the load loading ropes are connected with a tensiometer through the pulleys, and dynamic or / and static calibration of the six-dimensional force sensor is performed.

The invention discloses a falling body type impact calibration device. The device comprises a bottom plate, a lifting mechanism is arranged on one side of the bottom plate, lifting installation framesfixedly connected with the bottom plate and the top plate are arranged at the upper end and the lower end of the lifting mechanism respectively, a double-acting air cylinder is arranged on one side of the lifting mechanism, a base is arranged on the bottom plate, guide columns and buffer devices are symmetrically arranged at the two ends of the upper portion of the base, and retainers are arranged on the guide columns and can move along the guide columns, and a hammer head is arranged in the retainer. The device has the beneficial effects that required test data are acquired through the sensor mounted on the hammer head, the provided acceleration range is 50-20000 m / s^2, the pulse width range is 1-30 ms, and the device is small in size, large in instantaneous energy, wide in calibration range, good in repeatability, high in precision and high in safety.

The invention discloses a single-end SAR ADC capacitance mismatch calibration method, which can calibrate the error caused by the capacitance mismatch of the SAR ADC. This method only needs to insert two pairs of redundant capacitors in the analog domain, and compensates for capacitance mismatch in the digital domain. The binary capacitor DAC containing two pairs of redundant point capacitors includes the segmented binary capacitor DAC and the redundant capacitors Cjr+, Cjr- inserted in the lowest bit Cj of the segmented capacitor MSB segment, and the redundant capacitors Cqr+, Cqr+ inserted in the LSB segment Cqr‑. The redundant bit calculation module adds the inserted redundant bit and other normal bits to calculate an effective output of N-bit. The capacitance mismatch calibration module performs capacitance mismatch compensation on the output result. This calibration method only adds two pairs of redundant capacitors to the traditional SAR ADC structure, and the calculation of mismatch compensation is performed in the digital domain, thereby reducing the layout area and the complexity of the analog circuit.

The invention discloses a magnification factor calibration method for a microscope. The magnification factor calibration method comprises the following steps of: with a standard raster with a known raster pitch as a reference, acquiring a raster image in a microscope to be calibrated; carrying out fast Fourier transform on the acquired image to obtain a spatial frequency spectrum; selecting an interval where certain level of resonant frequency is located from the spatial frequency spectrum, and carrying out local high-resolution discrete Fourier transform to obtain a local high-resolution spatial frequency spectrum; selecting a frequency with a maximum amplitude as a resonant frequency from the local high-resolution spatial frequency spectrum, and dividing the resonant frequency by the level to obtain a base frequency; calculating the size of the standard raster corresponding to the image by using the raster pitch and the base frequency; and calculating the magnification factor of the microscope by using a ratio of the display size of the image to the size of the standard raster corresponding to the image. Compared with the traditional method, the magnification factor calibration method is high in precision, large in calibration range and wide in applicability when being used for calibrating the magnification factor of the microscope.

The invention relates to a method for calibrating misalignment angles of a two-dimensional autocollimator. The method comprises the following steps: (1) rotating azimuth angles and pitch angles of a reflecting mirror to determine pixel numbers, azimuth angles and pitch angles (x, y, h, v) in the horizontal direction and the vertical direction corresponding to m*n points; performing fitting on the m*n points by using multiple curved surfaces to obtain corresponding coefficient matrixes of the azimuth angles and pitch angles, and for any point in an imaging region, resolving the azimuth angle and the pitch angle of the point according to the pixel numbers x and y in the horizontal direction and the vertical direction of the point and the coefficient matrix of the azimuth angle and the pitch angle. The method provided by the invention is flexible to use, the fit maximum number of times and the number of measuring points can be continuously changed according to a calibration result until the requirement on the calibration accuracy is met, and moreover, the higher the fitting times is, the more the measuring points are, and the higher the calibration accuracy is.

The invention provides a device for calibrating space charge density measurement equipment, and the device comprises a power supply, an upper electrode plate, a lower electrode plate, insulating supporting columns, an arc light lamp, a galvanometer, a platform, and a fan. The positive and negative electrodes of the power supply are respectively connected with the lower and upper electrode plates through wires, and the lower and upper electrode plates are supported by the insulating supporting columns. The galvanometer is disposed on a wire between the negative electrode of the power supply and the upper electrode plate. The arc light lamp is disposed at the edge of the lower electrode plate, and the fan is located above the arc light lamp. The platform of the space charge density measurement equipment is placed between the upper electrode plate and the lower electrode plate. The device is clear in principle, is simple in structure, is low in manufacture cost, is safe and convenient for use, is large in calibration range, and is suitable for the calibration of different types of space charge density measurement equipment. The device is mainly used for the calibration of the space charge density measurement equipment based on an ion counting method, a Faraday cage method, a charge screening method and a probe array method.

The invention relates to a photoelectric response characteristic calibration method for a two-dimensional imaging device, which comprises a ray diffraction grating, a focusing optical system, a two-dimensional imaging device to be calibrated and a computer system, wherein an incident light beam for calibrating the two-dimensional imaging device is a light beam parallel to the plane, the light beam is imaged on the photosensitive surface of the two-dimensional imaging device after being modulated by the space intensity of the ray diffraction grating and being converged by the focusing optical system, the incident light beam forms a series of diffraction sub light spots with modulated light intensity on the photosensitive surface of the two-dimensional imaging device through the beam splitting characteristic of the ray diffraction grating, a plurality of groups of measured data are fused through peak value measuring data of each diffraction sub light spot and peak value theoretical dataobtained by theoretical calculation, the measured data and the corresponding theoretical data are obtained, the two groups of data are combined for completing the photoelectric response characteristic calibration of the two-dimensional imaging device. The photoelectric response characteristic calibration method has high light energy utilization rate, is applicable to the photoelectric response characteristic calibration of the two-dimensional imaging device under the condition with strong light sources and is also applicable to weak light sources, and the calibration range is enlarged throughthe fusion of a plurality of groups of measured data.

The invention belongs to the technical field of optical fiber measurement, and particularly relates to a calibration device for optical coherence polarization measurement and a dynamic range calibration method thereof. The device comprises a broadband optical source and power monitoring device 510, a first optical fiber connector 521, a second optical fiber connector 522, a high-precision calibration device 530, an optical path correlator 540, and a polarization crosstalk detection and signal recording device 550. A polarization-maintaining optical fiber with a specific length and an alignment angle is used for building a calibration device, and the position and the magnitude of a measurement peak are precisely positioned; by using two-order interference peaks of multiple crosstalk points, a low peak value is precisely positioned; and by using different calibration gradients, the calibration precision and the accuracy are improved.

The invention relates to an underwater pressure sensor based on a magneto-rheological effect. The underwater pressure sensor is composed of an upper shell, a second O-shaped ring, a magnet exciting coil, a bolt, a nut, a first elastic body, a third polar plate, a second polar plate, a first polar plate, a positioning block, a lower shell, a framework, a third elastic body, a second elastic body, aprotective sleeve, a power-on wire, a current controller, a fourth polar plate, a push plate and a first O-shaped ring. The upper shell and the lower shell are connected through the bolt and the nut;the positioning block is mounted at the lower shell, and the framework is mounted at the upper part of the positioning block; the framework is provided with the magnet exciting coil and the protective sleeve; the push plate is in clearance fit with the upper shell, and first-stage sealing is carried out through the first O-shaped ring; and the push plate is arranged on the fourth polar plate, andsecondary sealing is carried out through the second O-shaped ring. The sensor has the advantages that the manufacturing cost is low, the piezoresistive effect of the magneto-rheological elastomer isutilized, the pressure calibration range is wider, and certain accuracy can be improved.

The invention relates to the technical field of meter calibration, and discloses a computer aided calibration method for a coal flow meter in the shell coal gasification process, which includes: acquiring production information related to a coal circulation phase online to automatically divide coal circulation load intervals and automatically search stable flow intervals; estimating reliability of data of the stable intervals; and finally giving linear regression, quadratic regression and cubic regression functions according to the calibration requirement, and giving a selection standard for regression ways. The computer aided calibration method can be used for effectively avoiding errors occurring in manual reading and calculation in calibration of a traditional coal flow meter, improving flexibility of data processing, and increasing calibration speed and improving calibration precision evidently.

The invention discloses a foreground time error correction circuit of a multi-channel time domain interleaved data converter, which is characterized in that a down-sampling channel data extraction circuit can reduce a signal transmission rate to a channel sampling rate, extracts data and uses a zero crossing point detection circuit to determine whether zero crossing points exist between every twoadjacent channel conversion data or not; a pre-normalization circuit can remove a non-difference part between channels and leave difference information between the channels as time error information between the channels; error information is converged to a channel time error value through an accumulator and a step length adjusting circuit, and then an original conversion signal containing a channel time error is corrected through a Taylor first-order expansion correction circuit. A mean square error detection circuit is added in the structure to determine whether the circuit is converged to reliable precision or not. According to the method, a zero-crossing point statistical technology is used, step length parameters can be adjusted according to actual conditions, convergence time and convergence precision are balanced, the flexibility of a correction system is improved, and channel time error correction of the multi-channel time domain interleaved converter is achieved.

The invention discloses a vidicon calibrating method based on double one dimensional drones; the method includes the following steps: two freely arranged one dimensional drones are set; the images of the drones are shot from different angles through a vidicon; vidicon coordinate systems and image plane coordinate systems of the vidicon under different shooting positions as well as a world coordinate system are respectively built; internal parameters and external parameters of the vidicon are solved after carrying out aberrance calibrating on the shot drone images. The calibrating method of the invention takes two one dimensional drones as a calibrating object, carries out shooting on the drone images from different angles after freely arranging two one dimensional drones on the field area of the vidicon and can carry out calibrating on the internal parameters and the external parameters of the vidicon only after picking up three or more characteristic points of each drone image; auxiliary devices are not needed; the vidicon calibrating method based on double one dimensional drones of the invention is simple to operate, and can improve the calibrating precision of the vidicon and enlarge the calibrating range of the vidicon.

The invention relates to a device and a method for verifying or correcting instrument equipment for measuring the flow rate. In order to solve the problems of low verification accuracy, narrow verification range, low safety and the like of an existing verifying device and verifying method of a liquid metal flowmeter, the invention provides a verifying device and a verifying method of a liquid metal flowmeter. The device comprises a storage tank, a heater, an electromagnetic pump, a main measuring cylinder, an auxiliary measuring cylinder, a preheater, a liquid metal flowmeter connector A, a liquid metal flowmeter connector B and a vapor trap. The verifying method employing the verifying device is used for verifying different measuring ranges of the liquid metal flowmeter in a segmental verifying mode. The verifying device of the liquid metal flowmeter provided by the invention is an original standard device, is capable of realizing actual flow verification on the transfer flow magnitude or the test accuracy of the liquid metal flowmeter, and is high in verification accuracy, large in verification measuring range, high in safety, low in cost and excellent in applicability.

The invention discloses a method and a device for calibrating a flow coefficient of an orifice plate by adopting a pressure method, and the method comprises the following steps: measuring the pressure change to obtain the relationship between multiple groups of pressure and flow, and further fitting the slope and intercept of a flow coefficient function expression. The device comprises a feeding container, a feeding slow pressure tank, a pressure stabilizing tank and a receiving container which are sequentially communicated through a vacuum pipeline, a valve is arranged at an outlet of the feeding container, an electric pressure regulating valve is arranged between the feeding slow pressure tank and the pressure stabilizing tank, and a pore plate is arranged in the vacuum pipeline between the pressure stabilizing tank and the receiving container. According to the invention, mass weighing is not needed; the number of test points is not limited by the number of collection containers in a weighing method, and the test points can be freely increased; the flow coefficients of pore plates with different pore diameters can be measured by adjusting the volume V of the gray area, and the calibration range of the pore plates is wide; the influence of weight error of the weighing and receiving container is avoided; and the potential safety hazard of excessive gas collected by the material collecting container is avoided.