248results about How to "Improve measurement results" patented technology

A hand-size structured-light three-dimensional metrology imaging system and method. Laser illumination stripes are scanned across a workpiece surface for obtaining z-height and x-coordinate information. A Scheimpflug configuration is used. Utilizing this configuration, a laser illumination stripe across a raised workpiece portion will be shown in a contour image at the image sensor in a focused manner, such that the offsets along the contour image line due to the raised portions of the workpiece surface can be accurately converted to a z-height measurement. The y-axis positions associated with each of the contour images, used for reassembling the information from the contour images into a surface map for the workpiece, may be determined without the need for a position sensor, by including a reference object in the contour images.

The invention provides a multi-line scanning laser radar device, which comprises a moving part and a fixed part which are connected by a rotary support, wherein a laser emitting optical system and a laser receiving optical system are arranged inside the moving part in parallel; a driving motor is arranged inside the fixed part and is fixedly connected with the rotary support through a rotating shaft; and the laser emitting optical system, the laser receiving optical system and the driving motor are electrically connected with a driving control system respectively. The aim of performing multi-line three-dimensional scanning on an imaging target is fulfilled, and the imaging speed and the imaging quality are improved.

The invention provides an online detection device for the pulp flow rate and a multi-parameter online detection integration system, which comprise a pulp container which has a feed port and a discharge port and is arranged on a support through a, weighing cell, a pulp flow rate detection device which is provided with a soft connector at the discharge port, and/or a pulp density measuring device, a pulp grain size measuring device and a pulp grade measuring device. The online detection device for the pulp flow rate and a multi-parameter online detection integration system can not only measure any single index of the flow rate, density, grain size and grade of the pulp according to requirements, but also simultaneously measure two or above two or even all of the indexes with high measuring accuracy, good stability and reliability. The online detection device for the pulp flow rate and a multi-parameter online detection integration system also have the advantages of simple structure, high working efficiency, low labor intensity, wide application range, etc., thereby being capable of providing the highly reliable flow rate, density, grain size and grade control parameters for liquid products to ensure product quality, reduce cost and improve working efficiency, and providing a highly guaranteed measuring device and system for full automatic control.

An x-ray CT system that generates tomographic phase contrast or dark field exposures, has at least one grating interferometer with three grating structures arranged in series in the radiation direction, with a modular design of the second and third grating structures. The distance between the first grating structure of the x-ray source and the second grating structure (fashioned as a phase grating) of the respective grating/detector modules is adapted, depending on the fan angle, corresponding to a period of the grating structure of the x-ray source projected onto the grating detector module at a respective fan angle (φ_i).

The invention relates to a low-temperature tensile test device for a metal material. The low-temperature tensile test device for the metal material consists of the following components: a pair of clamps for clamping a test sample, a sample chamber for providing a sealed space for the test sample, a refrigeration device for providing energy for cooling the test sample, a temperature measuring device for monitoring uniformity of temperature in the sample chamber and an extension device for measuring yield strength of the test sample. The device has the advantages of no need of reconstructing the conventional tensile test machine, convenience in measurement, accuracy in measurement result and low cost.

A device for measuring the mass of a flowing medium with a temperature-dependent measurement element has a measurement conduit whose faces, which extend perpendicular to a surface fixed by the measurement element, are inclined and approach each other in the flow direction of the medium in the measurement conduit. The invention is provided for measuring the mass of a flowing medium to measure the intake air mass of internal combustion engines.

The invention discloses a method and a device for FMCW radar ranging. The method comprises the following steps of: performing spectrum analysis on an FMCW radar intermediate-frequency signal after analog to digital (A/D) sampling; judging whether the frequency spectrum of the FMCW radar intermediate-frequency signal meets the correcting condition of a phase difference method or not; correcting the frequency spectrum by the phase difference method if the signal meets the correction condition so as to acquire the corrected intermediate frequency, and computing the range according to the corrected intermediate-frequency; and computing the range by using the intermediate frequency acquired after the spectrum analysis if the signal does not meet the correction condition. In the method, whetherthe FMCW radar intermediate-frequency signal meets the correcting condition of the phase difference method or not is judged before the frequency spectrum of the FMCW radar intermediate-frequency signal is corrected by the phase difference method, so that excellent measuring results can be acquired by the phase difference method. Therefore, the method and the device improve the accuracy of FMCW radar ranging.

The invention discloses a large building deformation monitoring device and a monitoring method through the large building deformation monitoring device. A laser transmitter of the large building deformation monitoring device is composed of a laser controller, a laser power supply and a laser collimator, wherein the laser controller is connected with the laser power supply, and the laser power supply is connected with the laser collimator. A laser receiver is composed of a semi-permeable laser target, a light shield, an image sensor, and an attitude sensor, wherein the semi-permeable laser target is connected with the light shield, the light shield is connected with the image sensor, and the image sensor, the attitude sensor and a wireless transmitter are respectively connected with a microprocessor, and therefore the large building deformation monitoring device is formed. The method monitoring method through the large building deformation monitoring device includes that the laser transmitter is mounted at a reference position which is close to an object to be tested and is relatively fixed; the laser receiver is mounted at a point to be tested on a deformation surface; and the linear displacement, perpendicular to the deformation surface, of the laser receiver is the deformation value of the point. According to the large building deformation monitoring device, laser is utilized for testing deformation, and therefore the large building deformation monitoring device is convenient to install and test, high in accuracy, and suitable for long-time on-line monitoring of the deformation of large buildings.

A device for determining a parameter of a medium flowing in a line, according to the related art, does not offer sufficient protection for a measuring element from liquid or solid particles which may dirty or damage the measuring element in an unwanted way. A device (1) according to the present invention has an input region (27), whence, on the one hand, the flowing medium flows into the measuring channel (30), and on the other hand, through at least one separation opening (33), liquid and solid particles flow, and thus flow so as to bypass the measuring channel (30).

PCT No. PCT/DE97/00044 Sec. 371 Date Feb. 12, 1998 Sec. 102(e) Date Feb. 12, 1998 PCT Filed Jan. 10, 1997 PCT Pub. No. WO97/47952 PCT Pub. Date Dec. 18, 1997A device for measuring the mass of a flowing medium, with a temperature-dependent measurement element that substantially reduces measurement errors due to a pulsating flow that is characterized by means of flow fluctuations. The device has a measurement conduit which extends from an inlet to an outlet that is adjoined by a first section piece of a deflection conduit. The medium flows from the outlet to the first section piece and is deflected by an edge face into a second section piece of the deflection conduit. The edge face of the first section piece of the deflection conduit is embodied as inclined in relation to the flow direction in the measurement conduit. The invention is provided for measuring the mass of a flowing medium, for the intake air mass of internal combustion engines.

The invention relates to an ultrasonic thickness measurement device and method for multilayered wave-absorbing coatings, and belongs to the technical field of ultrasonic non-destructive testing and evaluation. The device comprises a portable digital ultrasonic flaw detector with a bandwidth ranging from 0 to 35 MHz, a delay block probe or an ultrasonic delay line probe partly immersed in water, a coating sound velocity calibrated sample and a computer integrated with a thickness measuring arithmetic. The device is characterized in that the coating thickness is calculated by selecting delta t or fn according to the characteristic of ultrasonic echo wave; and through the iteration windowing analysis by combining the autocorrelation method with the sound pressure reflection coefficient power spectrum method, the coating thickness measuring is realized by selecting an exact fn. The device and the method have the advantages that the limitations that in the conventional ultrasonic thickness measuring technology, the requirements to frequency bands of a flaw detector and the probe are high; the data interception needs manual intervention, and the device is only suitable for single-layer coating, are overcome; the size of the device is small; the weight is light; and the device is suitable for the on-the-spot thickness measuring of various matrixes and outer layers of multilayered coatings, and has major economic benefits and social benefits.

A DWS apparatus includes a coherent light source, a photodetector, a control unit which can measure an intensity autocorrelation function, a measuring unit which can measure a source-detector distance to obtain source-detector distance data, and a calibrating unit which adjusts the intensity autocorrelation function by using the source-detector distance data. The calibrating unit calibrates the intensity autocorrelation function by adjusting the time constant of the autocorrelation function based on a comparison of the source-detector distance to the time constant of the intensity autocorrelation function.

The invention discloses a method for measuring gas-solid jet flow fields by combination of terahertz wave and infrared optical wave and a device thereof. By combination of terahertz imaging and infrared optical wave thermal imaging methods, the whole gas-solid jet flow field is measured. Terahertz wave is rectified to parallel rays and penetrates the gas-solid jet flow field; terahertz spectrum attenuated by the flow field is analyzed; by comparison of the terahertz spectrum with known gas composition, gas-phase field distribution information of the measured gas-solid flow field is obtained; solid particles are heated to a certain temperature and enters the measured flow field area with the gas-phase jet flow; the solid particles distributed in the flow field emit infrared optical waves all around; motion trajectory and distribution information of the solid particles are captured by an infrared thermal imaging technology; and gas-solid jet flow field information are simultaneously obtained at real time by combination of two imaging methods, namely the terahertz imaging and infrared optical wave thermal imaging methods. The invention provides a new method for simultaneously measuring gas-solid flow fields. The method has advantages of good system stability, high feasibility and high measurement accuracy.

A time difference type supersonic wave flow measuring method and device belongs to a flow measuring method and device; speed distribution of real fluid is related to flow states, speed distribution on a circular pipe cross section in laminar flow is a rotation parabolic type, and speed distribution on a circular pipe cross section in turbulent flow is a boss type; supersonic wave carries fluid flow speed information when propagating in a flowing fluid, so the fluid flow speed can be detected according to received supersonic wave, and is converted into flow; a time difference type supersonic wave flow meter can calculate the flow through measuring the time difference of the supersonic wave beam in a forward flow and counter current propagation process; if the flow speed of the supersonic wave in a propagation path is assumed to be uniform, large measuring errors can be caused, and the time difference type supersonic wave flow measuring method can obtain the flow with more accuracy; the advantages are that the time difference type supersonic wave flow measuring method is reliable in theory, simple in device, reliable in method, convenient to implement, high in measuring precision, can improve the measuring result by 5-33%, and is suitable for all supersonic wave flow meters measuring flow according to propagation time difference.

The invention relates to the technical field of coiled tubing testing, and discloses a coiled tubing ovality testing method. Lift-off heights of eight points of the same circumference of a certain position of coiled tubing are detected by means of the adoption of a displacement sensor, and then ovality of the coiled tubing on the position is calculated. Compared with a magnetic flux leakage testing method and an ultrasonic testing method, the coiled tubing ovality testing method can achieve undamaged, contactless and continuous measurement, cannot be subjected to influences of non-electrical-conductivity sundries of the surface of the coiled tubing, and is suitable for coiled tubing in various specifications or straight pipes and bent pipes made of other materials.

The invention discloses a device and a method for measuring a spatial free attitude of a rigid object, and a method for analyzing data, and relates to a measurement technology. The device comprises a planar orthogonal four-directional cursor generation device and a linear array charge coupled device (CCD); and the linear array CCD is provided with a data output interface. In the invention, a position detector consists of a plurality of linear array CCDs, so the problem that a detector with a large planar array position cannot be substituted is solved, the measurement device is simplified and the same measurement precision within a measurement range can be guaranteed. By adoption of the method for processing the data, the measurement of a linear light position can reach the subpixel level under the condition of poor data quality; and finally, a systematic measurement result can reach a higher level.

The invention belongs to the field of optics, and relates to a measurement device and method for transmission wavefronts of a self-focusing lens. The measurement device for the transmission wavefronts of the self-focusing lens comprises a light source, a convergent mirror, a target plate, a collimating mirror, an aperture, a first microscope objective, a second microscope objective, a positioning reference structure, a Shack-Hartmann wavefront sensor and a control computer; the convergent mirror, the target plate, the collimating mirror, the aperture, the first microscope objective, the second microscope objective, the positioning reference structure and the Shack-Hartmann wavefront sensor are successively arranged on an emergent light path of the light source; the Shack-Hartmann wavefront sensor is connected with the control computer; the self-focusing lens to be detected is placed between the first microscope objective and the second microscope objective. The invention provides the measurement device and method for the transmission wavefronts of the self-focusing lens based on the Shack-Hartmann wavefront sensor, which is free from external environmental influences and capable of guaranteeing test precision.

The invention relates to a transformation substation leakage current and capacitive current online monitoring management system and a working method of the system. The system comprises a voltage sensor module, a first voltage acquisition module, a fist processor module, a current sensor module, a second voltage acquisition module and a second processor module. The voltage sensor module is used for acquiring bus voltage signals. The first voltage acquisition module is used for acquiring electric supply signals located at the bus end. The first processor module is used for calculating corresponding fundamental wave amplitude according to the bus voltage signals and the electric supply signals at the bus end so that a first phase angle of the bus voltage signals relative to the electric supply signals can be acquired. The current sensor module is used for acquiring field leakage current and capacitive current signals. The second voltage acquisition module is used for acquiring electric supply signals located in the field. The second processor module is used for calculating corresponding fundamental wave amplitude according to the leakage current and capacitive current signals and the electric supply signals located in the field so that a second phase angle of the leakage current and capacitive current signals relative to the electric supply signals can be acquired. The first processor module and the second processor module are connected with a centralized control device, and the centralized control device is used for calculating corresponding parameters of the leakage current and capacitive current signals.