33results about How to "Easy and accurate calibration" patented technology

A method and system for easy and accurate calibration and characterization of an image capturing device is provided. Captured spectral calibration target data is received and sensor spectral sensitivities of the image capturing device are obtained. A determination of white point data for calibration of the image capturing device is made. Sensor spectral sensitivities of the image capturing device can be obtained from data from a manufacturer of the image capturing device or automatically by spectral decomposition methods. The white point data also can be determined by spectral decomposition methods. Captured spectral calibration target data can be obtained from a pre-existing standard, such as IEC 61966-8.

This invention provides a position-detecting mechanism and a position-detecting sensor, the calibration of the sensor easy, the deviation of a web from the reference line of the sensor easy to find. The position-detecting mechanism comprises (i) a light-emitting means 13 to emit a beam of visible light to a subject of measurement and (ii) a regulating means 14 to regulate the beam so that its cross section will be in a certain shape at the place of the subject of measurement and detects the position of the subject of measurement. Because the light-emitting means 13 emits a beam of visible light, the spot lit up by the beam on a subject of measurement is visible to the operator. Accordingly, the operator can judge the position of the subject of measurement by using his eyes alone without using a scale and easily, safely judge its position even while it is running on its production line.

The invention discloses a tension-compression type residual stress calibration device, which belongs to the technical field of experimental stress measurement in material processing. The device includes a tension and compression loading mechanism, a clamping mechanism and a supporting mechanism. The tension-compression loading mechanism applies uniform tensile or compressive stress in the direction of the entire thickness of the calibration material; the clamping mechanism can adjust the clamping position according to the tension-compression type of the calibration material; the tension-compression loading mechanism and Clamping mechanism, and can adjust the height by itself. The present invention can be used as a supporting loading device for residual stress detection methods such as blind hole method, indentation strain method, etc., to accurately calibrate the stress-strain relationship of materials under tensile stress state and compressive stress state. It solves the problems of convenience and ease of use but uneven stress field during three-point bending loading, or the need for large-size samples and difficult loading when using a tensile testing machine for calibration.

The invention discloses a position calibrating method of a medical ultrasonic three-dimensional imaging based on linear scanning, comprising the steps that a rectangular solid with known sizes is used as a scanning object, on the premise of assuming that an angle conversion relationship does not exist between an original ultrasonic image plane and a linear guide rail, a two-dimensional image is subjected to the three-dimensional reconstruction, and then an actual mathematic relationship of the angle and the deformation amount of the reconstructed rectangular solid between the original ultrasonic image plane and the linear guide rail can be calculated; and in the actual calibrating process, the rectangular solid is scanned by a linear scanning method, the sequence of the ultrasonic image is subjected to the three-dimensional reconstruction, the deformation amount of the reconstructed rectangular solid is substituted into a mathematic relationship to calculate the rotation angle between the original ultrasonic image plane (i.e. the position of an ultrasonic probe) and the linear guide rail, and the rotation angle is the calibrating result of the position of the ultrasonic probe in the linear scanning mode. The position calibrating method has the advantages that the simplicity and the easy understanding are realized, the operability is high, the test is simple, and the calibrating is convenient and accurate. The position calibrating method can be used for a three-dimensional ultrasonic imaging system based on a free arm linear scanning method or a mechanical driving linear scanning method.

The invention discloses an image calibration device and method for a mark on a printed board, the image calibration device for the mark on the printed board comprises a board feeding unit, a main camera unit, an auxiliary camera unit and a control system, and the image calibration method for the mark on the printed board comprises the following steps: fixing and conveying the printed board by the board feeding unit; the auxiliary camera unit preliminarily shoots a printing plate image, uploads the image to a control system display screen, clicks to determine an image where the mark position is located, then the main camera unit converts the determined position image of the mark into a view, fine adjustment of mark coordinates is carried out, and after the mark position is fine adjusted, clicks, stores and establishes coordinate parameters of the mark, and the mark is calibrated; and then the control system controls the main camera unit to be converted into a view mode, the mark on the printed board is calibrated or scanned and recognized, and the calibration, calibration or detection work of the mark can be completed after calibration or scanning is completed. The calibration method is irrelevant to the shape of the printed board, and the mark calibration is more accurate and rapid.

The invention relates to the field of data processing and provides a tank capacity table construction method and device based on real-time data acquisition. The method includes the steps that oil tank refueling information and oil engine refueling information are obtained; a tank gun refueling record is generated according to the oil tank refueling information and the oil engine refueling information; an oil tank capacity table is calibrated according to the tank gun refueling record. According to the method, the oil tank refueling information and the oil engine refueling information are obtained, the tank gun refueling record is generated according to the oil tank refueling information and the oil engine refueling information, the oil tank capacity table is calibrated according to the tank gun refueling record, a simple and accurate oil tank capacity table calibration method is provided, and capacity tables of oil tanks in any shape and in any position can be conveniently and accurately calibrated.

The invention relates to a method and arrangement for measuring a timber piece (4) in a wood handling machine (1). Such a wood handling machine comprises booms (2) arranged in a base machine and a wood handling device (3) operating therein. In such a wood handling machine (1), a wood handling device (3) grips the timber piece (4) to be handled, after which one end of the timber piece is guided into a measuring carriage (5) in the wood handling machine by the wood handling device. The timber piece arranged in the measuring carriage is subjected to one or more observation measures by observation means provided in the measuring carriage.

In an autonomously navigating utility vehicle adapted to run a working area defined by a laid boundary wire autonomously having a pair of magnetic sensors installed on either sides of the vehicle at positions laterally symmetrical with respect to a vehicle straight forward center line to produce outputs indicating intensity of magnetic field of the wire, an angular velocity sensor adapted to produce an output indicating angular velocity around a vertical axis of the vehicle, the vehicle is controlled to move to a prescribed position at which an angle of the center line relative to the laid wire becomes a reference angle based on the outputs of the magnetic sensors, and to turn by 180 degrees, and calibrates the output of the angular velocity sensor by outputs of the angular velocity sensor obtained at the turning.

The invention belongs to the technical field of lathe fixtures, in particular relating to a turning fixture of a cast steel sleeve for a lathe. The fixture comprises a lathe tail end fixture and a lathe head end fixture, wherein the lathe tail end fixture comprises a hollow sleeve positioning block and a taper shaft; the taper shaft is provided with a bearing; the part, which is provided with the bearing, of the taper shaft is positioned in the hollow sleeve positioning block; the lathe head end fixture comprises a sleeve positioning block; the end part of the sleeve positioning block is provided with a lathe chuck clamping bulge end; and the hollow sleeve positioning block and the sleeve positioning block are coaxially arranged, and positioning edges are both oblique. When the turning fixture provided by the invention is used, the taper shaft of the lathe tail end fixture and the lathe chuck clamping device of the lathe head end fixture are fixed at the tail and head of the lathe respectively; the lathe tail end fixture can be adjusted so that the cast steel sleeve rotates along with the lathe spindle without deformation or dislocation under the concentric clamping force at the head and tail of the lathe during a turning process; and in the turning process, the fastening is reliable, the correction is convenient and accurate, the operation is safe and reliable, and the maintenance amount is small.

The invention provides a flow meter convenient to check. The flow meter comprises a flow meter body, a first pipeline connected with the medium inlet of the flow meter body and a second pipeline connected with the medium outlet of the flow meter body, wherein a third pipeline is connected to the first pipeline or the second pipeline, and is communicated with the corresponding pipeline, a switching valve is arranged on the circulation path of the third pipeline, the medium outlet of the third pipeline is used for connection of a plug-in flow meter so as to carry out continuous flow verification on the flow meter body, and the first pipeline or the second pipeline is further provided with an installation part used for installation of an external clamping type flow meter, so that the flow meter body can be calibrated without interrupting flow. Due to the arrangement, the plug-in flow meter and the external clamping type flow meter are convenient to install, so that the processes of point finding, trepanning, welding and the like of the plug-in flow meter in the past are avoided, the processes of point finding, scribing and the like of the outer clamping type flow meter in the past are also avoided, and convenience and quickness are achieved.

The invention relates to a calibration device for a three-dimensional force measuring platform, which aims at overcoming the defect that the current force calibration device cannot carry out simultaneous force calibration of three directions on a flat plate type three-dimensional force measuring platform and a convex plate type three-dimensional force measuring platform according to the using needs, and providing a device for carrying out comprehensive and simultaneous orthogonal calibration on the force measuring sensor of the three-dimensional force measuring platform. The device can calibrate the two kinds of three-dimensional force measuring platforms with different appearances. The device is composed of a weight tray assembly, a counter-force plate and spoke type pressure sensor assembly and a three-dimensional force measuring platform calibration device foundation platform assembly, wherein the weight tray assembly is put on the three-dimensional force measuring platform, the counter-force plate and spoke type pressure sensor assembly is connected with the three-dimensional force measuring platform and is fixed by a bolt, and the three-dimensional force measuring platform is connected with the three-dimensional force measuring platform calibration device foundation platform assembly and is fixed by the bolt. The weight tray assembly is composed of a channel steel welding frame and a leg cushion block, and the leg cushion block is connected with the channel steel welding frame through the bolt.