34results about How to "Accurate and convenient calibration" patented technology

In an electronic component mounting apparatus capable of replacing a component placing device with any of plural other component placing devices different in performance, the distance between the center line of a component pick-up portion of a replaced component placing device and the optical axis of a board recognizing camera is calibrated easily and precisely. A movable table is positioned so that a reference mark provided on a base frame to reside in the visual field of a component recognizing camera comes in the visual field of a board recognizing camera and that at the same time, the end of the component pick-up portion of the replaced component placing device comes in the visual filed of the component recognizing camera. The board recognizing camera is used to detect the positional relation of the optical axis thereof relative to the reference mark, while the component recognizing camera is used to detect the positional relations of the optical axis thereof relative to the reference mark and relative to the center line of the component pick-up portion. These detected positional relations are used to calculate the positional relation between the optical axis of the board recognizing camera and the center line of the component pick-up portion.

The present invention relates to the technical field of automobile maintenance and discloses a calibration device for a lane keeping assist (LKA) system. The calibration device includes a support apparatus, a laser and a pattern board. The support apparatus includes a horizontal graduated scale. The laser is configured to be mounted on the body of an automobile and to emit a laser beam to the horizontal graduated scale. The pattern board is mounted on the support apparatus and is configured to attach an alignment pattern. By means of the calibration device, two lasers are mounted on wheels on two sides of the automobile. Two laser beams that are emitted from equal distances with the wheels being reference points are irradiated to the horizontal graduated scale. Based on marks on the horizontal graduated scale, the support apparatus may be moved to an appropriate position to calibrate the centerline of the automobile.

The invention relates to a free multi-view point multi-projection three-dimensional display system and method. The free multi-viewpoint multi-projection 3D display system consists of 1-5 pairs of color CCD cameras for shooting, one color CCD camera for calibration, 2-8 projectors, a large-screen display terminal, a calibration board and a It consists of a computer equipped with a multi-channel synchronous image acquisition card and a multi-output graphics card. The computer is connected to the camera through the image acquisition card and connected to the projector through the display card. The three-dimensional multi-projection display method includes steps such as image source video encoding, projector calibration, stereoscopic image splicing and the like. The three-dimensional multi-projection display system of the present invention is based on computer vision technology, and can realize large-screen, realistic three-dimensional multi-projection display.

An abscissa calibration jig of a laser interference measuring apparatus, includes: an image projection unit configured to project an image with a marker; a first support mechanism configured to rotatably support the image projection unit around a first rotation axis passing a predetermined rotation center; and a second support mechanism configured to rotatably support the first support mechanism around a second rotation axis crossing the first rotation axis at the rotation center.

The invention discloses a calibration device and a calibration method for a photoelectric detector. The calibration device comprises a beam splitter prism, an absolute detector and a processing unit; the beam splitter prism is arranged above the photoelectric detector; the photoelectric detector is arranged on a work-piece table; a lighting light is divided by the beam splitter prism into a first measuring light and a second measuring light; the absolute detector is arranged at one side of the beam splitter prism; the second measuring light comes into the absolute detector; the first measuring light comes into the photoelectric detector; the processing unit is used for calculating the light intensity of the second measuring light measured by the absolute detector and the light intensity of the first measuring light measured by the photoelectric detector, building a relation between the photoelectric detector and the absolute detector, and calibrating gain and offset of the photoelectric detector. The calibration device and the calibration method are simple to operate; environmental pollution of a human factor on inside of a photoetching machine is reduced; the test accuracy is improved; and the light measured by the absolute detector and the light measured by the calibration detector are the same light, so that the situation of transmittance change caused by volatility of a light source is avoided, thereby improving the measurement accuracy.

The invention provides a sampling method based on software frequency tracking. Non-full-period sampling is adopted, the deviation of the non-full-period sampling is decreased to be lower than a specified value, standard full-period sampling is achieved, and measurement accuracy of the non-full-period sampling is improved. The invention provides a broadband voltage / current calibration device and a broadband power / phase calibration device adopting the sampling method based on software frequency tracking. The broadband voltage / current calibration device comprises a broadband voltage / current source, a broadband resistance voltage / current divider, a sampling digital voltmeter, a signal generator and a computer, wherein the broadband voltage / current source is connected with the sampling digital voltmeter through the broadband resistance voltage / current divider, the output end of the signal generator is connected with an outer trigger port of the sampling digital voltmeter, and the computer is respectively connected with the signal generator, the sampling digital voltmeter and the broadband voltage / current source.

The calibration method of the thermal resistance heat flow sensor includes the following steps: a) setting a heat conduction plate; b) symmetrically installing several heat flow sensors and temperature sensors on both sides of the heat conduction plate; c) the heat flow values ​​collected by each heat flow sensor , cold surface temperature and hot surface temperature Send to the heat flow-temperature inspection instrument respectively; d) The heat flow-temperature inspection instrument is based on the formula Calculate the standard heat flow value ; e) According to the formula Calculate the correction coefficient C of the heat flow value; f) When the error between the correction coefficients C of the heat flow value for consecutive N times does not exceed 1%, calculate the average value of the N correction coefficients C , and write it into the configuration file of the Heat Flow-Temperature Inspector as the final heat flow value correction factor. The calibration result is accurate, high in precision, convenient and feasible, effectively solves the problem that the heat flow instrument cannot be accurately calibrated in the thermal inspection of buildings, and improves the experimental efficiency and reliability.

The invention discloses a calibration block assembly for a displacement monitoring system. The displacement monitoring system comprises a base, a linear sensor, a linear sensor pressure head, a connecting rod, a connecting rod installation block and a driving cylinder. The linear sensor is mounted on the base. One end of the connecting rod is connected with the linear sensor pressure head, and theother end of the connecting rod is connected with the connecting rod installation block. The driving cylinder is connected with the connecting rod installation block. The calibration block assembly includes a first calibration block suitable for calibrating the installation position of the linear sensor of the displacement monitoring system, a second calibration block suitable for calibrating theinstallation position of the linear sensor pressure head of the displacement monitoring system, and a third calibration block suitable for calibrating the installation position of the connecting rodinstallation block of the displacement monitoring system. The calibration block assembly can calibrate the installation positions of the linear sensor, the linear sensor pressure head and the connecting rod installation block conveniently and accurately before the displacement monitoring system is reused.