370results about How to "Realize Calibration" patented technology

The invention discloses a method for calibrating and correcting temperature measurement of an infrared probe as well as a corresponding temperature measuring method. The temperature measurement calibration and non-uniform correction process is as follows: the non-uniform correction is carried out firstly; the temperature measurement calibration is carried out after a collection parameter sum is generated; however, the non-uniform correction is not stopped simultaneously; and in the non-uniform correction, a step of circularly judging whether an extrusion exists in a parameter or not is carried out; and if so, the parameter is corrected; otherwise, the judgment is continuously carried out. A temperature measurement calibrating process comprises the following steps of: carrying out the non-uniform correction once by using the calculated non-uniform parameter for each probe response of collecting a temperature; then recording the temperature and probe response data; repeating the processuntil collecting enough data; and fitting the data to obtain a probe temperature response function. By utilizing the method disclosed by the invention, the steps of non-uniformly correcting and calibrating the temperature measurement of the infrared probe are simplified into one step, so that the correction and the calibration which can be previously realized by the two steps are conveniently realized on one hand, and the precision of the temperature measurement can be improved on the other hand.

The invention relates to a time-domain ground-air electromagnetic detection system and a calibration method, in particular to a system consisting of an induction signal recording device connected with a ground recording device global position system (GPS) synchronization unit, a closed abnormal ring and a data quality evaluation system, and a calibration method for the time-domain ground-air electromagnetic detection system. The closed abnormal ring and the induction signal recording device are adopted, the induction current and induction voltage are simultaneously recorded, and the 24-bit 200Hz sampling rate, a bandwidth of 0-13KHz and a dynamic range of an amplifier of 160dB are achieved. Moreover, the system is synchronous with a ground transmitter and an air receiver GPS, and during measurement, by removing earth background field data, a pure closed abnormal ring electromagnetic signal containing a geometric error is extracted, is input into the data quality evaluation system, andis compared and fitted with the computed closed abnormal ring theoretical value, the system error, the geometric parameter error and the detection resolution of the time-domain ground-air electromagnetic detection system are determined, and the performance of the electromagnetic detection system is tested and calibrated.

It is the general calibration method of model-surface optical measuring system. Calibration board on which is located evenly with black rhombic square array in the white background and projector calibration grating of corresponding rhombic square array are uniquely employed in this invention. The calibration board position is corrected by laser to make the projector to project rhombic square array into the white interstice on the calibration board whose images before and after shutting up the projector is recorded by the camera used as calibration image. Then the basic data are obtained through the processing of the calibration image and accordingly the space coordinates of the projector calibration dots can be calculated. The calibration of the projector is realized on the basic datum through matching the coordinates of corresponding calibration dots of projector image. According to the relationship between the coordinate systems of projector and camera the calibration of systematic geometric parameter can be realized. The invention is of great engineering utility and can solve the accuracy problem of automatic extraction and realize the integrated calibration of camera and projector.

A multifunctional binocular vision sensor of welding robot and relative marking method comprise a camera, a dimming filtering system, an aerating system, a reflector system, and a mounting support, while the camera, aerated system and the dimming filtering system and the reflector system are all fixed on the mounting support, the camera, aerated system, a dimming filtering system, and reflector system are vertically arranged at one side of a welding gum from up to down, the camera and the dimming filtering system are coaxial. The invention also provides relative marking method, while the invention can meet the demands of guiding, welding seam track and quality control in welding process, with high accuracy and effect.

The invention relates to a micro force load device of piezoelectric film suspension beam micro force sensor, belonging to sensor and test technical field, used for the static and quasi-static test and label of piezoelectric film suspension beam micro force sensor, wherein a micro force load device is composed of a one-dimension micro displacement table, a two-dimension micro displace table, a piezoelectric dual-crystal micro force generator, and a damping device. The one-dimension micro displacement table is composed of an X-axis micrometer element and a one-dimension micro displacement table base. The two-dimension micro displace table is composed of a Y-axis micrometer element, a Z-axis micrometer element, a two-dimension micro displacement table base, a support plate and a socket head cap screw. The piezoelectric dual-crystal micro force generator III is composed of a micro probe, a fixing block, two piezoelectric ceramic plates, an aluminum plate, a clamping plate and a socket head cap screw. The invention has simple and reliable structure, easy operation, and improved resolution of micro force loading system, to resolve the problems as instability and hard control of micro Newton force load.

The invention relates to a method for controlling gear shifting of a two-gear mechanical automatic gearbox of a pure electric automobile. By the method, during first gear shifting after the automobile is started each time, whether a target gear is engaged or not is not only judged through a displacement sensor signal, but also a rotation blockage signal of a gear-shifting motor isadded for controlling, so that whether a displacement sensor generates signal drift or not is judged, an output valve of the displacement gear is marked, and the numerical value judgment range for judging whether corresponding gears are in place in a control program is corrected in time. By the method, each time a vehicle is driven, the displacement sensor is diagnosed, and after a signal drift phenomenon, the signal drift is corrected in time, so that the influence on the gear shifting process caused by signal drift is reduced, and the accuracy and the reliability of the entire gear-shifting process are improved.

The invention belongs to the fields of antenna measuring technique and satellite navigation and positioning, and relates to a correction method for the absolute antenna phase center of an outdoor GNSS (Global Navigation Satellite System) receiver based on a precision mechanical arm. In view of the problem that conventional outdoor GNSS observation cannot obtain a high-precision correction model for the absolute antenna phase center of a receiver, a majority of common errors are eliminated through ultra-short baseline observation, the absolute phase center offset (PCO) of a receiver antenna and the separation of phase center variation (PCV) are realized through rapid rotation and inclination of the high-precision mechanical arm, finally the PCO is resolved through a least squares algorithm, and fitting calculation of the PCV is carried out for observation residual. According to the correction method, outdoor operation can be carried out, the correction precision of 1mm for the PCO and PCV can be reached, the correction method is suitable for accurate calibration of the PCO and PCV of the receiver capable of tracking the signals of satellite navigation systems such as a GPS (Global Positioning System), a BDS (Beidou Navigation System), a GLONASS (Global Navigation Satellite System) and Galileo, and thus the systematic measuring error caused by imprecision of the PCO and PCV of the receiver can be eliminated, and the user positioning precision is further improved.

The invention provides a pressure monitoring system marking instrument of an automobile tyre and a marking method thereof. The marking instrument includes two parts; one is a tyre pressure sensor and the other is a diagnosing marking device; the tyre sensor includes a central control module 2, a sensor 1, a RF transmitting circuit and a lower frequency receiving circuit; the tyre sensor is connected with the lower frequency receiving circuit and the central control module 2; the central control module 2 is connected with the RF transmitting circuit and the sensor 1; the marking instrument consists of an SCM, the lower frequency transmitting circuit, the RF receiving circuit, a human-computer interface and a communication interface; the SCM is connected with the lower frequency transmitting circuit; the tyre sensor is connected with the RF receiving circuit which is connected with the SCM; the SCM is connected with the human-computer interface and the communication interface. The invention can simply realize the diagnosing and the marking of the pressure monitoring system sensor of the tyre, is suitable for the automobile types of any collocation, is not interfered by the tyre pressure monitoring system on other automobiles and can not affect other automobiles.

The invention belongs to the field of industrial robot calibration and discloses a method of calibrating a six-dimensional force sensor at the tail end of an industrial robot. The method comprises thefollowing steps of (a) in the measurement process of the six-dimensional force sensor, constructing a relational expression of a force, a torque and displacement measured by the sensor and a relational expression of zero values of the force and the torque on the sensor and a mass center of a load tool; (b) acquiring data of the forces and the torques measured by the six-dimensional force sensor under multiple postures, and performing calculation with a least square method to obtain the zero values of the force and the torque of the six-dimensional sensor; (c) constructing a relational expression about the gravity of the load tool and performing calculation; and (d) constructing a relational expression about installation angles of a sensor coordinate system and a tail end flange coordinatesystem along a Z axis and performing calculation. By adopting the method, the calibration time is shortened, and the measurement precision is improved after a calibration result is compensated.

The present invention belongs to the field of robot structural parameter calibration, and discloses a method for calibrating structural parameters of a robot using a double-ball-bar. The method comprises the following steps: (a) mounting a calibration rod and a tool cup, and fixing a calibration baseplate and three central seats; (b) calibrating a tool coordinate system and a user coordinate system, and measuring the lengths of the sides of a triangle BCD using the double-ball-bar; (c) presetting a point A in space to form a spatial tetrahedron with the BCD, and obtaining the coordinates of point A under the user coordinate system according to the lengths of the sides of the tetrahedron; (d) obtaining vector <base>O'6-CO6-Ai through conversion of coordinates of robot joints to base coordinates; (e) measuring the lengths of the lateral sides of the tetrahedron using the double-ball-bar, and obtaining vector <base>aAi*c according to conversion of user coordinates to base coordinates; and (f) obtaining the structural parameters of the robot according to the parallelogram principle. According to the present invention, the calibration of the structural parameters of a six-degree-of-freedom articulated robot using the double-ball-bar is achieved simply and quickly, and the calibration result has high accuracy.

The invention discloses an external parameter calibration method used when a camera and a two-dimensional laser range finder are used in a combined mode and relates to three-dimensional information image processing of objects. According to the external parameter calibration method used when the camera and the two-dimensional laser range finder are used in the combined mode, a foldable calibration plate is used for achieving external parameter calibration when the camera and the two-dimensional laser range finder are used in the combined mode, the foldable calibration plate is a long plane which is formed by splicing small rectangular black planes and small rectangular white planes alternately and can be unfolded and folded, the foldable calibration plate is unfolded when used, and the unfolding angle can be adjusted freely; calibration of internal parameter of the camera is achieved by means of a Matlab camera calibration tool box; a camera and two-dimensional laser range finder system is established; the foldable calibration plate is placed, and calibration is completed under the condition that the number of times of information acquisition of a system is smallest; image information and two-dimensional information are acquired and processed by the camera and the two-dimensional laser range finder respectively; processed camera information and processed two-dimensional laser range finder information are matched in a one-to-one mode for combined calibration; a calibration result is optimized by means of the Levenberg-Marquardt algorithm, and then calibration is completed.

The invention relates to an in-orbit calibration method of star sensor lens distortion and a satellite attitude determination method based on starlight vector correction. The invention relates to an in-orbit calibration method of star sensor lens distortion and a satellite attitude determination method. The invention aims at solving a problem of incapability of calibrating a temperature distortion term of an existing calibration method, and a problem of low precision of an existing satellite attitude determination. The star sensor lens distortion in-orbit calibration method comprises the steps that: an included angle between fixed star incident light and a lens optical axis is obtained by calculation according to target fixed star imaging point coordinates and a star sensor lens distortion formula; a light vector direction of the target fixed light is obtained according to the included angle of the incident light and the lens optical axis; and in-orbit calibration of star sensor lens distortion is carried out according to a principle that the included angles of light vector directions of a plurality of target fixed stars are fixed. The attitude determination method comprises the steps that: a target fixed star starlight vector is obtained by calculation according to the target fixed star imaging point coordinates and the star sensor lens distortion formula obtained by calibration; and satellite attitude is determined through star map matching. The methods provided by the invention are applied in the technical field of satellite attitude determination.

The invention provides a method for monitoring the bending moment of an airplane wing in real time based on an FBG (fiber bragg grating), and the method comprises the following steps: 1, pasting FBG sensors on the airplane wing; 2, converting a central wavelength signal of the FBG sensor into a stress value of a measurement point; 3, carrying out the solving of a stress of the surface of the airplane wing in an axial direction; 4, calibrating the unit flexural rigidity; 5, calculating the bending moment through the stress value of the measurement point. Through the above steps, n groups of FBG sensors are pasted on the airplane wing, and a known concentrated force is applied to the tail end of an airplane wing rigid shaft. Moreover, the relation between the stress and the bending moment is built through the plane stress state of the surface of the airplane wing, thereby achieving an effect of converting the stresses measured by the FBG sensors into bending moments, and solving a problem of the real-time monitoring of the bending moment of the airplane wing.

A mobile terminal camera calibrating method includes the steps of selecting a plurality of feature points on a calibration object, a black-and-white checkerboard image; using a mobile terminal camera to be calibrated to take at least two calibration object images; recognizing image space coordinates of the feature points in the taken calibration object images, and determining object space coordinates corresponding to the image space coordinates; according to a projection change relation of the image space coordinates (u and v) and object space coordinates (X, Y and Z) of the feature points, calculating calibration parameters, a principal distance component (fx and fy), an eccentric distortion coefficient (cx an cy), a radial distortion coefficient (k1, k2 and k3) and a tangential distortion coefficient (p1 and p2). The method is designed specially according to physical features of the mobile terminal camera; calculation of the calibration parameters of the mobile terminal camera is achieved; the problems such that the traditional calibrating method has long service time, is inconvenient to operate, high in prices and unsuitable for mobile terminals are solved; calculation results are precise and stable, and effective implementation of calibration of the mobile terminal camera and acquisition of high-quality images is forcibly guaranteed.

The invention provides a method for calibrating a thermal infrared imager. The method, by correcting dynamic range and focal plane temperature of the thermal infrared imager, takes comprehensive considerations of impact factors from temperature drift effects and ge-window attenuating effects, and establishes the function relation between temperatures and the response of the thermal infrared imager after correction so as to calibrate the thermal infrared imager. According to the invention, the method is intended for calibrating the thermal infrared imager, can at the same time calibrate a plurality of thermal infrared imagers, can calibrate accurately and has strong applicability.

The invention discloses a two-line structure light-based online welding seam forming visual detection method. The method comprises the steps of sampling a calibration board under different exposure time to realize calibration of line structure light; after three-dimensional reconstruction, correcting reconstruction results on a mother board by using a standard plane; and finally in combination with three-dimensional reconstruction results of continuous line structure light, performing matching on two three-dimensional curved surfaces, thereby obtaining three-dimensional data of a same positionon the mother board before and after welding on line; and obtaining results of roughness, height, width and the like of a welding seam on line. According to the method, a relatively good result can be obtained under the condition of the uneven mother board such as surfacing or the like; a function can be realized under the condition of the even mother board; the calibration precision and the three-dimensional reconstruction precision can be effectively improved; and a welding seam forming result is subjected to multi-angle analysis.

The invention relates to a global calibration method and apparatus that are used for calibrating a system including a camera array and a rotary table. During execution, at least one calibration chessboard is arranged at the rotary table and the calibration chessboard can rotate with the rotary table. The method comprises: the rotary table is controlled to rotate and shot pictures of the calibration chessboard are obtained in more than two directions; according to the shot pictures, a positional relationship between cameras and the calibration chessboard and a positional relationship between cameras are determined; according to more than two shot pictures and a three-dimensional world coordinate system of the calibration chessboard, a rotation center of the rotary table is determined; on the basis of the positional relationship between the cameras and the rotary table, the positional relationship between the cameras, and the rotation center of the rotary table, a pose relationship between the cameras and the rotary table is determined. According to the method provided by the invention, the calibration chessboard is used for assisting the computer in calibrating the pose relationship between the camera array and the rotary table in the system. The hardware equipment cost is low; installation becomes simple and conveniently; and the method is easy to implement.

The invention provides an automatic calibration device of a static electric field sensor and a calibration method thereof. A three-dimensional electric field sensor test supporting seat is adopted so as to realize calibration and testing to a three-dimensional electric field sensor. Simultaneously, the device is also a multi-mode automatic calibration device, and compatibility and flexibility are good. Functions of automatic adjustment of a high voltage power supply output voltage, arbitrary arrangement of electric field measurement points and adjusting time intervals, automatic acquisition of electric field data, processing and the like are realized and calibrate efficiency and precision of the electric field sensor are greatly increased. A slide rail is used to connect a test pole plate structure and a shielding structure box body, and during calibration, operation is convenient and maintenance is easy. A conductive metal wire and an equal voltage division resistor string are arranged so as to increase the calibration precision. A temperature sensor and a humidity sensor are arranged in an electric field test box so that an important reference basis is provided for electric field sensor environment adaptability research.