128results about How to "Achieve precise calibration" patented technology

The invention discloses a method for marking IMU each item error coefficient precisely, which comprises the following steps: marking the gyroscopic scale factor and gyroscopic installment error in the IMU error model through dynamic calibration experiment; substituting the error value in the symmetrical 24 position static calibration experiment of adjacent position; adapting the symmetrical position error cancellation law to mark IMU residual each item error coefficient within gyroscopic constant drift, error item of gyroscope and acceleration, accelerometer constant bias, accelerometer marking factor and accelerometer fixation error.

The invnetion discloses a method and set for calibrating the mapping of virtual grid by using double light-knifes in three-dimension measure of laser line scanning. The set includes central processing unit, controller, measuring base stage, translating slide guides, photoelectric measuring head and standard flat plate. There are three slide guides along X, Y, Z, axes, and said measuring head is installed on the lower end of Z-axis. The standard flat plate is on the surface of base stage. The virtual grid builds up the relationship of mapping function between two-dimension imaging space and two-dimension physical space, so as to realize accurate calibration of measuring system. When measuring is carried on, the coordinate values of physical space that is relevant to each imaging point on measuring light-knifes can be measured. With scanning by the photoelectric measuring head going on, the information of three-dimension contour of surface of object measured can be obtained.

The invention relates to a method for calibrating a mechanical arm joint and calculating a rotating angle based on visual motion capture and discloses a mechanical arm calibrating and tracking system based on the visual motion capture. The mechanical arm calibrating and tracking system comprises an optical driven motion capture system, computer master control equipment, visual software and an external display screen. The mechanical arm calibrating and tracking system comprises the following modules including a motion capture data acquiring and processing module, a mechanical arm joint calibration module, a joint angle calculation module and a three-dimensional virtual scene reproducing module based on OpenGL. The invention can be used as a practical and effective solution for calculating the mechanical arm joint and calculating the angle and has a favorable application prospect.

The invention discloses a system and a method for measuring frame delay time of a photographing system of an optical measurement device. The system comprises an image recording apparatus (1), a photographing system (2), a timing terminal (3), a control and display LED (Light-Emitting Diode) lamp array apparatus (4) and an LED lamp array (5). The method comprises the following steps of: judging the number of image outputting delay frames of a video camera, according to the time information on a digital image output by the photographing system and the information of the LED lamp array; providing time and external interruption signals by the timing terminal; recording the image of the photographing system and superposing the time information of the recording moment by the image recording apparatus; controlling an LED array to turn on or turn off the LED lamps by the control and display LED lamp array apparatus according to the external interruption signal and the time information; and imaging the LED array by the photographing system. The system and the method provided by the invention realize accurate calibration on image outputting delay time of the photographing system.

The invention discloses a device for testing the registration of receiving shaft and emitting shaft of a laser ranging system, wherein the device comprises a beam folder, a collimator, an analogue echo generator, and a beam angle micro adjuster. The analogue echo generator is composed of a fiber couple, a multimode fiber, a fiber collimator, and an adjustable fiber attenuator. Th method uses the collimator and the beam angle micro adjuster to adjust a reference beam and an analogue echo parallel to accurately mark the initial position of the analogue echo light, adjusts the beam angle micro adjuster, to watch the change of the output signal of the receiving part of the object system to obtain the adjusted angle value, to be compared with the angle value of the initial position to obtain the horizontal and vertical bias of the emitting shaft and the receiving shaft of the laser ranging system. The invention has the advantages that the invention directly uses the laser of the object system to couple, without additional lasers, with simple structure, and combines the beam angle and the output signal of the object system, to improve the reliability and accuracy of the test result.

The invention relates to a self-calibrating method of a two-dimensional large-stroke precision workbench measuring system and belongs to the field of precision machining and measurement. The self-calibrating principle is utilized for the method, a glass plate with even grids is used as an auxiliary measuring device, a two-dimensional workbench is self-calibrated respectively according to areas, and system errors of all the areas are obtained; system error compensation is performed on the corresponding areas, and coordinates of discrete points in calibration coordinate systems are obtained; linear fitting is performed on the coordinates of the discrete points in all the areas, and grids of the calibration coordinate systems are obtained; on the basis of the coordinate system transformation principle, the calibration coordinate systems of the adjacent areas are transformed, a unified calibration coordinate system in the whole area is obtained, and finally the two-dimensional large-stroke precision workbench measuring system can be self-calibrated. Through the self-calibrating method, large-stroke and high-precision self-calibration of the two-dimensional workbench is achieved, and meanwhile the function of calibrating the high-precision two-dimensional workbench through the low-precision grid glass plate is achieved. A high-precision calibrating tool is not needed, and the self-calibrating method is high in calibration precision and suitable for calibrating various two-dimensional precision workbenches.

The invention discloses a method for directly calibrating micro thrust and micro impulse. By the method, the characteristics of uniform magnetic induction intensity distribution and extremely small magnetic flux leakage in an electromagnet air gap are utilized, a current-carrying wire passes through the air gap, the action of certain ampere force is applied to the wire, and the ampere force and the acting time are measured, so that the micro thrust and the micro impulse can be calibrated. When static thrust is calibrated, a stressed coil is arranged at a stressed point of a measuring device, the position of an electromagnet is adjusted, the ampere force direction of the stressed coil is taken as the thrust direction to be calibrated, and the static thrust can be calibrated according to the linear relation between the current of the stressed coil and the stressed ampere force. When the micro impulse is calibrated, the current of the stressed coil and the acting time of the current are measured, and the impulse of the ampere force can be acquired by using the calibrated linear relation between the current and the ampere force of the stressed coil, so that dynamic impulse can be calibrated. The method overcomes the defect of the conventional calibrating method and has the outstanding advantages of small error, high precision, wide calibrating range and the like.

The invention discloses an accurate vision positioning method for condenser cleaning robots. The method comprises the following steps that: the coordinate transformation relation between a camera coordinate system and an image plane, as well as the coordinate transformation relation between the image plane and a pixel coordinate system are established; nonlinear distortion is introduced on the basis of a pinhole imaging model, and a distorted image is restored; main noise of an underwater image is eliminated through an index low-pass filter and a homomorphic filter; a novel self-adaptive threshold method based on edge detection is utilized to carry out binarization segmentation to the image and eliminate incomplete tube orifices on a boundary; the edge pixel coordinate set of each tube orifice is obtained by scanning twice; and a least square method is utilized to fit the tube orifices so as to obtain a circle center coordinate of the tube orifice of a condensing tube, thereby realizing the accurate positioning of the underwater condensing tube. The invention has the advantages that the method is high in positioning precision and simple in process, needs no high-cost auxiliary adjustment equipment, and is applicable to the condenser cleaning robots in the on-site calibration for condensing tube orifices.

The invention discloses a calibrating device for an eddy sensor. The calibrating device comprises a micrometer, wherein the micrometer is fixed on a rack base through a micrometer bracket; a measuring flat-end is connected with the micrometer; a sensor bracket is fixed on the rack base; a sensor positioning block is fixed on the sensor bracket; the sensor bracket and the axis of the micrometer bracket are on the same straight line; a V-shaped groove structure is arranged on the sensor bracket; the eddy sensor is clamped in the V-shaped groove structure and locked through the sensor positioning block and a positioning screw; the rack base is made from high-carbon steel and marble materials; the reaction of the eddy sensor to displacement variation can be calibrated by fine adjustment to precision of the micrometer; calibration is realized by data comparison; and by changing the distance between the eddy sensor end surface and the measuring flat-end, the linearity and the sensitivity of the eddy sensor can be measured. Therefore, the calibrating device has the characteristics of high resolution, easy operation and adjustable linear range, and has the advantages of stable and reliable detection result and simple operation.

The invention discloses a method and device for calibrating the relative attitude of a camera and a rotating shaft, and a storage medium, and the method specifically comprises the steps that a first camera collects a sampling image at each sampling position, the sampling position is a stop position after the rotating shaft drives a second camera to rotate by a preset angle, and the sampling imagecomprises a whole first calibration plate; extracting each first angular point on each sampling image, and a fitting plane of each first angular point is generated; the coordinates of each first angular point at each sampling position are respectively projected on a corresponding fitting plane to generate a fitting circle of each first angular point; and first attitude calibration parameters ofthe second camera and the rotating shaft are calculated according to the fitting circle, and the relative attitudes of the second camera and the rotating shaft are adjusted according to the first attitude calibration parameter. The first camera is arranged to assist in calibrating the second camera and the rotating shaft, the first attitude calibration parameters of the second camera and the rotating shaft are calculated, and accurate calibration between the rotating shaft and the camera is achieved.

The invention relates to a digital camera projection center position precision calibration method based on a photogrammetric technology, and aims at effectively solving the problems of high precision and operability. The method comprises the steps that a return light reflection measurement mark, a control point mark, an encoding mark, a directional target and a standard ruler are laid to form a calibration field; an electronic theodolite and a to-be-inspected camera are arranged at the position 3 meters away from the calibration field, and the return light reflection measurement mark is stuck to a camera lens; the calibration field is photographed by the camera at the different horizontal positions to obtain multiple photos, the calibration field is photographed by the to-be-inspected camera at the different positions in front of the calibration field at different attitudes, and data of the control point mark are extracted from the photos to form calibration data; the coordinates of a central image point of the control point mark are corrected and resolved to obtain three projection center positions. According to the method, control point mark image center measurement, high-precision camera calibration and projection center precision measurement can be integrally achieved, and the calibration precision of the projection center positions is higher than 5 mm.

The embodiment of the invention provides a calibration method and device for a proximity sensor, electronic equipment and storage medium, The method is applied to the electronic equipment provided with a proximity sensor below a touch display screen. The method comprises the following steps of: if it is detected that the electronic equipment is in the screen-off state, acquiring an approximate value corresponding to each infrared emission power when the proximity sensor carries out detection according to two different infrared emission power; and determining whether a calibration condition ofthe proximity sensor is met or not according to the proximity value corresponding to each infrared transmitting power, each infrared transmitting power and the proximity value corresponding to each infrared transmitting power, and calibrating the proximity threshold value of the proximity sensor when the calibration condition is determined to be met. According to the method, whether the calibration condition of the proximity sensor is met or not can be effectively determined, accurate calibration of the proximity sensor is achieved under the condition that the calibration condition is met, andthe problem that the proximity function of the proximity sensor is abnormal can be effectively solved.

The present invention discloses a carrier three-times difference-based outdoor GNSS absolute antenna phase center calibration method. According to the method, firstly, a short baseline is subjected to double-difference resolving during the large-angle and rapid movement of a precision mechanical arm. Secondly, three differential processes among epochs are conducted after the ambiguity is fixed. An extremely short epoch interval can eliminate the antenna phase center errors of a reference station. Moreover, measurement errors caused by the multi-path effect are greatly weakened. Therefore, the antenna absolute phase center compensation PCO and the antenna phase center variation PCV of a GNSS are accurately modeled. According to the invention, based on the outdoor actually-measured data of the GNSS, the phase center errors of a to-be-measured antenna can be separated from relative positioning residual errors. Moreover, the suppression effect on the multi-path effect in the low-height angle observation mode is more obvious. As a result, the PCO calibration and the PCV calibration at the precision of 1mm are realized. The method has an obvious improving effect on the high-precision positioning of GPS/BDS/GLONASS/GALILEO systems.

The invention discloses an extremely high vacuum gauge calibration device and a method, belonging to measurement field. The device comprises an extremely high vacuum gauge, an extremely high vacuum calibration room, a first valve, a vacuum gauge to be calibrated, a small hole, a second valve, a third valve, a high-precision vacuum gauge, an extremely high vacuum aspirating chamber, an extremely high vacuum air-bleed set, a flow limiting hole, a pressure stabilizing chamber, a non-evaporable getter pump, an air source, a micrometering valve, a flowmeter air-bleed set and a fourth valve, and the peripheral equipment includes a heating device. With the device and the method disclosed by the invention, the measurement uncertainty is small, accurate calibration to the extremely high vacuum gauge within the pressure range smaller than 10<-9>Pa can be realized, and the flow measurement range is expanded.

The invention discloses a radar two-dimensional installation attitude calibration method based on a global positioning system target. The radar two-dimensional installation attitude calibration method comprises the steps of S1, finding out two appropriate feature points on the roadside to serve as target placement sites; S2, enabling a GPS measurement antenna in the target to obtain absolute position coordinates of the target; s3, enabling the radar to scan the triangular corner reflectors in the two targets to obtain relative position coordinates of the targets in the radar coordinate system; s4, establishing a first coordinate system and a second coordinate system according to the obtained absolute position coordinates and relative position coordinates of the target, and determining the relationship between the first coordinate system and the second coordinate system; and S5, converting the data in the second coordinate system into the data in the first coordinate system so as to obtain the absolute position of the point cloud data collected by the radar, and converting the position of the origin of the second coordinate system in the first coordinate system into the absolute position of radar installation. According to the invention, accurate calibration of the radar installation attitude is realized, the actual position of the radar acquisition point cloud data is determined, and convenience is provided for later radar data processing.

The invention relates to the field of intelligent agriculture, in particular to a meshed field crop base fertilizer application effect evaluation model which is composed of a soil testing and fertilization model, a mesh dividing model and a fertilization effect evaluation model, wherein the soil testing and fertilization model is a fertilizer preparation algorithm model of fertilizers such as nitrogen, phosphorus, potassium, medium trace elements and the like according to the fertilizer demand of crops, the fertilizer supply capacity of soil and the fertilizer effect on the basis of soil detection and field tests; the mesh dividing model is a land mesh model in which soil nutrient content is used as a parameter, and the mesh dividing model is used for performing mesh dividing on soil according to soil census, cultivated land fertility survey or local field test data; and the fertilization effect evaluation model is a model for performing grade evaluation on the final actual base fertilizer fertilization effect of the whole target plot by performing result comparison with the optimal fertilization amount provided by the soil testing and fertilization model in each mesh and taking the area proportion of each mesh as a weight.

The invention discloses a method and device for calibrating a rotating shaft and a storage medium. The method includes: specifically, enabling an image acquisition device to acquire a to-be-processedimage containing a first calibration plate; calculating a deflection angle of the position of the image acquisition equipment relative to the position of the first calibration plate; according to thedeflection angle, enabling the rotating shaft to drive the image acquisition equipment to rotate to a first sampling position and a second sampling position respectively; collecting a first sampling image at the first sampling position, collecting a second sampling image at a second sampling position, wherein an included angle formed between the first sampling position and the second sampling position is the maximum rotation range of the image acquisition equipment driven by the rotating shaft to acquire the complete first calibration plate, and calculating attitude calibration parameters of the image acquisition equipment and the rotating shaft according to the first sampling image and the second sampling image. According to the embodiment of the invention, the image acquisition device isdriven by the rotating shaft to acquire images, attitude calibration parameters between the image acquisition device and the rotating shaft are calculated, and accurate calibration of the rotating shaft is realized.

The invention discloses an airborne laser radar beam pointing calibration method and system and a laser spot detector. The method comprises the following steps: step 1, arranging a laser spot detectorincluding a detector group and a detector group support frame in a scanning field of view of a laser radar; step 2, moving the detector group in a horizontal direction and/or a vertical direction, detecting the edge of a laser spot of the laser radar, and determining the central position of the laser spot; step 3, measuring space coordinates of the central position, and collecting laser measurement data of the laser radar for the central position; changing the position of the laser spot detector in a scanning field of view of the laser radar, and executing the steps 2-3 to enable the laser spot detector to detect different laser spots in the scanning field of view; and step 4, according to the space coordinates of the central position of the laser spot and the laser measurement data, calculating calibration parameters of the laser radar by using a laser radar beam pointing model, thereby realizing airborne laser radar beam pointing calibration.

The invention discloses a calibration system for a fan electric generator set rotation shaft torque balance. The calibration system for the fan electric generator set rotation shaft torque balance comprises a loading unit, a data acquisition unit and a control unit, the loading unit comprises loading tools and a loading mechanism, the loading tools comprise a base and a square plate used for applying a twisting torque, the lower end of the torque balance requiring to be calibrated is fixed to the base through screws, the upper end of the torque balance is fixed to the square plate through screws, the base and the square plate are both horizontally arranged, the loading mechanism is respectively connected with the square plate and the base in a ball-hinged mode, a torque Mx around an X-axis, a torque My around a Y-axis and a torque Mz around a Z-axis are applied on the torque balance through the square plate, the loading mechanism is in signal connection with the control unit through aforce transducer, and the data acquisition unit is in signal connection with the torque balance. According to the calibration system for the fan electric generator set rotation shaft torque balance, three torque values with large loads can be applied at the same time, so that accurate calibration of the torque balance is achieved.

The invention discloses a micro-flow calibration device and method of a double-channel symmetrical structure. The device is composed of gas supply systems, stop valves, a needle valve, pressure gauges, monitoring pressure gauges, a pumping system, a flow calibration chamber, a flow comparison chamber, temperature collecting systems, a volume compensation system and micro flow measurement instruments; through pipeline connection, two channels which are symmetrically arranged on the left and right are built, the shapes of the symmetrical channels are symmetrical, and the geometrical dimensions of the symmetrical channels are the same. Through staged measurement in combination with the volume compensation system, effects of outlet pressure, the gas types and the temperatures on measurement are reduced to the minimum, so that precise calibration of the micro-flow measurement instruments under the different outlet pressure, in the different gas and at the different temperatures is achieved.

The present invention relates to a sheet material thickness detection tool. The tool comprises a workbench, a guide slot configured to transmit sheet materials and laser displacement sensors, the guide slot and the laser displacement sensors are located on the workbench, there are two laser displacement sensors which are respectively arranged at two sides of the guide slot, the two slot walls of the guide slot are respectively provided with corresponding gaps, the gaps are U-shaped slot structures, the gaps correspond to the laser displacement sensors, the front end of the guide slot is provided with an optoelectronic switch, and the lower of the guide slot is provided with an automatic calibration mechanism. The sheet material thickness detection tool can achieve automatic calibration, does not need frequent manual calibration and saves labor. The present invention further relates to a sheet material thickness detection method.

The invention discloses a line laser sensor space pose calibration piece and a calibration method, which combine the advantages of gear measurement center contact measurement and a simple geometric feature calibration piece, and realize accurate calibration of a line laser sensor through simple and easy calibration operation. On the basis of a standard mandrel, a cuboid metal block is arranged in the middle of the axis, and the centers of the upper end face and the lower end face of the standard mandrel are each provided with a conical hole for fixing. The coaxiality and cylindricity of an upper shaft section S1 and a lower shaft section S2 of a standard core shaft part of the calibration piece are required to be 1 [mu]m. The perpendicularity of the plane I and the plane II is 1 [mu]m, and the parallelism of the plane I and the plane II and the axis of the standard mandrel is 1 [mu]m. The calibration piece is simple in structure, the existing manufacturing process can meet the machining requirement of high-precision geometrical characteristics, the calibration piece is combined with the advantage of gear measurement center contact type measurement, calibration operation is simple and easy to implement, and accurate calibration of the line laser sensor can be achieved.

The invention discloses a calibration device and method for calibrating a vacuum gauge by using a vacuum leak hole. The device is composed of the vacuum leak hole, a stop valve, a pressure gauge, a calibrated vacuum gauge, an air pumping system, a pressure stabilizing chamber, a calibration chamber and an air supply system. When a gas flowing out of the vacuum leak hole with the known leak rate enters the calibration chamber, the gas in the calibration chamber generates the standard pressure through the accumulation for a period of time, and by comparing the standard pressure and the reading of the calibrated vacuum gauge, the calibrated vacuum gauge is calibrated. Compared with a conventional static expansion method, the device and the method have the advantages that the operation is simple, the efficiency is high, and the accurate calibration of different gases on the vacuum metering range width can be realized through one leakage hole.