168 results about "Standard measure" patented technology

The invention is a measuring method for MOS device heat carrier injecting effect. At first, the stress voltage value of drain and grid electrode of the device needed to be measured are determined according to the standard measuring device, and records the initial data through the data recording program; then the device needed to be measured is placed into the socket of the circuit board, at the same time, supplies voltage to the drain and grid electrode; shuts off the stress voltage at time point after 10, 20. and 50 seconds, the MOS is pulled out form the circuit board, and the degeneration quantity of designated parameter measured by the device are recorded; after the first time of data recording, all the MOS tubes are inserted into the original socket of the circuit board, then carries on correspondent voltage stress to the next time point, then stops the stress, then pulls out the MOS tubes form the circuit board, records the measured degeneration data, repeats the above mentioned steps until the degeneration quantity accords to the demands.

The invention relates to a calibration method of a linear structured light three-dimensional visual sensor based on measuring blocks. The method comprises the steps that the measuring blocks of different specifications are arranged at interval, then measuring block targets are fixed on movable guide rails, tested surfaces of the measuring block targets are ensured to be vertical to the moving direction of the guide rails, the guide rails are moved to obtain an axis coordinate of the measuring block targets and a light bar crossing point under the space coordinates system, and the axis coordinate is substituted into a mathematical model of the linear structured light sensor to be calculated to obtain sensor parameters. The method has the following advantages: the measuring blocks are standard measuring tools and have high precision and low cost; the targets are established by arranging the measuring blocks at interval; light bars projected by a laser projector on the tested surfaces of the measuring blocks can be continuous because of the arrangement of the measuring block, the length of each light bar is the nominal thickness of the measuring blocks. The precision of the targets is improved greatly, simultaneously the cost is lowered, and better cost performance is achieved.

The invention relates to a method for measuring railway tank car volume based on computer vision. The method comprises the following steps that the surface of a tank car is provided with a plurality of marking points with identical patterns and coding points with different patterns; a coding point ruler with two different patterns is arranged beside the tank car; a digital camera is adopted to take pictures of the tank car from multiple angles, and an overlapped coding point area is formed between every two adjacent pictures; each picture is input to a computer for image processing, and three-dimensional point coordinates of all coding points and marking points on an image are respectively established according to a computer stereovision three-dimensional reconstruction method based on image sequences so as to acquire three-dimensional point data on the surface of the tank car; three-dimensional shape of the outer surface of the tank car is reconstructed according to the three-dimensional point data; and the tank car volume is calculated according to the three-dimensional shape of the outer surface of the tank car and measured wall thickness of the tank car. The method has the advantages that the method has convenient operation and simple use and solves the problem that the prior standard measuring instrument is susceptible to human-induced factors during operation and has unstable measuring results; moreover, the method ensures that volume uncertainty is less than 0.2 percent.

The invention discloses a siting method of distribution centers. The method includes the steps of firstly, optionally selecting m sites as candidate sites of the distribution centers on a map of a target city; secondly, assigning historical distribution sites to the candidate sites of the distribution centers the nearest to the historical distribution sites according to the distances from the historical distribution sites to the candidate sites of the distribution centers; thirdly, calculating an average site of the distribution site assigned to the candidate site of each distribution center as a new candidate site of the distribution center; fourthly, repeating the first and second steps till a standard measure function starts converging and the m average sites being the sites of the distribution centers. By siting by the siting method, the distribution sites of the distribution centers are as compact as possible, and the distribution centers are as separate as possible. Finally, distribution cost is locally optimized.

The present invention relates to a harmonic source positioning and harmonic responsibility division method applied to an active distribution network. The main technical feature is that the method comprises a step of collecting the voltage and current of a common coupling point, a step of drawing the time-domain curve of an equivalent impedance and obtaining a harmonic source location, a step of obtaining the data needed by a harmonic impedance, and a step of calculating the harmonic mutual impedance between a concerned bus and each harmonic source and dividing harmonic responsibilities. The design of the method is reasonable, through establishing a load time-domain equivalent model, by using the physical relation of the voltage and current on a common coupling point, a parameter identification method is used to position the harmonic source in the active distribution network, through analyzing the bus harmonic voltage acted by all harmonic sources in the active distribution network and calculating the harmonic mutual impedance between the bus and the node where the harmonic source is to recognize the contribution of each harmonic source, and thereby a harmonic contribution standard measure is used to divide the responsibility of each harmonic source.

The invention relates to a tunnel middle section illumination standard measuring and calculating method based on safe visual cognition. The tunnel middle section illumination standard measuring and calculating method comprises the steps of (a) setting a light environment of a tunnel middle section; (b) arranging an object at the tunnel middle section; (c) enabling a driver to drive a motor vehicle to run towards the objected at different speeds and measuring visual cognition distances D of the objected, found by the driver, at the different speeds; (d) resetting average brightness L of the tunnel middle section and repeating the steps (b) and (c) and obtaining multiple groups of visual cognition distances D corresponding to different brightness L; (e) utilizing an S model to conduct fitting on the multiple groups of visual cognition distances D and brightness L data to calculate a D and L relation model formula (shown in the description); (f) substituting a safe visual distance D0 at highest limit speed of a tunnel parting into a model formula to obtain a dynamic minimum brightness value L0 required by the tunnel middle section in the tunnel light environment. The invention further provides a system for achieving the method. By means of the method and system, the accuracy of brightness safety evaluation of the tunnel middle section is improved, meanwhile the method is simple and convenient to operate, and a reference basis is provided for road traffic safety research.

The invention provides a micro-nano level 3-D measurement '331' system and a measurement method thereof. The system is characterized in that X, Y and Z-axis standard-measure dimension lines or extended lines thereof of the 3-D measurement system are arranged to be perpendicular to one another and intersect at one intersection point, so as to establish a 3-D coordinate system taking the intersection point as a coordinate origin; an X-axis guide-rail guide plane and a Y-axis guide-rail guide plane of a measurement platform in the measurement platform are arranged to be coplanar with a measurement plane where a measuring-head central point is, so as to form a coincidence plane; the intersection point of the X, Y and Z-axis standard-measure dimension lines or the extended lines thereof is on the coincidence plane of the measurement platform; meanwhile, the X and Y-axis standard-measure dimension lines or the extended lines thereof are also arranged to coincide with three planes, so as to ensure that X and Y coordinate planes of the established coordinate system coincide with the measurement plane; and the measuring-head central point is arranged to coincide with the intersection point of the three standard-measure dimension lines or the extended lines thereof. The invention satisfies the Abbe principle in 3-D direction, thereby effectively avoiding Abbe errors and guaranteeing high measurement precision.

The invention provides a method for measuring and calculating binocular vision displacement measurement errors and a measuring system based on a standard measuring tool (a screw micrometer or a vernier caliper). The method comprises the following steps of: arranging a marker on a meter head of the standard measuring tool; parallelly arranging the standard measuring tool in three coordinate axis directions in a three-dimensional coordinate system of a stereo space respectively, regulating the standard measuring tool to move the marker together with the meter heads in the three coordinate axis directions respectively and acquiring actual values of displacement of the marker; and calculating an arithmetic mean value of absolute values of the difference between the actual values and measured values of the displacement to acquire the displacement measurement errors in the three coordinate axis directions respectively, and calculating the displacement measurement errors in the three coordinate axis directions to acquire errors in an entire measurement range. The system comprises the standard measuring tool (the screw micrometer or the vernier caliper) and a binocular vision measurement device.

The invention relates to more accurate rotative and linear positional measurement for a rotary-linear drive. A measuring system comprising a linear sensor (12) and a rotary sensor (20) is disclosed. A decoupling unit (11,14,17) decouples the rotary displacement from the linear displacement of a shaft (10). The decoupling unit (11,14,17) has either a first measuring section (11), which is coupled in a fixed manner to the shaft to be measured (10) and tapped by the linear sensor (12) and a second measuring section (17), which is exclusively non-rotatably coupled to the shaft to be measured (10) and is tapped by the rotary sensor (20), or a first measuring section, which is coupled in a fixed manner exclusively linearly to the shaft to be measured and is tapped by the linear sensor and a second measuring section, which is non-rotatably coupled to the shaft to be measured and is tapped by the rotary sensor. In each case, the linear displacement is decoupled from the rotary displacement for the measuring process, permitting high-resolution standard measuring sensors to be used.

Image measurement values of a measurement object, in particular a printed sheet, measured by means of a photoelectric image measuring unit operating on the basis of pixels are corrected with respect to at least one influencing variable which influences the measurement result with a view to at least partially eliminating the effect of this influencing variable on the measuring process. The image measurement values measured by the image measuring unit are converted by correction parameters of a parameter-based correction model into corrected image measurement values which no longer contain the influencing variable affecting the measuring process. The correction parameters used for the parameter-based correction model are automatically calculated using reference measurement values measured at reference measurements points on preferably the same measurement object by means of a reference measuring unit and the image measuring unit. In particular, image measurement values measured without polarization filters are converted into polarization filter image measurement values by means of this method. Influences induced by print medium, fluorescence effects and the influences of non-standard measuring geometries are also corrected.

The invention discloses a measuring method of an automatic comprehensive panel detecting device. The method includes the steps of measuring panel parameters on the device according to measuring points and scanning line segments; measuring parameters including length, width, side straightness, squareness, central bending degree, side bending degree and warping degree according to the measuring points. The parameter measuring step includes the substeps of collecting values of firstly, a standard measuring panel, wherein a measuring point zero value database set on the standard board is established; secondly, measuring a to-be-detected sample, wherein the measuring value of the to-be-detected sample at the same point location as the standard board is measured; thirdly, conducting calculation, wherein data collected by an industrial personal computer according to sensors is calculated; fourthly, displaying and storing the measuring result. The step of measuring the thickness according to the scanning line segments does not include the first step, and the measuring value is obtained after the two sensors are driven to the measuring points on the front side and the back side of the to-be-detected sample to scan the scanning line segments respectively. The method has the advantages of being comprehensive in measuring parameter, wide in range, automatic in measuring process and high in work efficiency.

An improved retractable tape measure has, according to a preferred embodiment of the present invention, the features of a standard measure, including a housing with front and rear sides, a boundary edge and a tape opening, a retractable measuring tape positioned within this housing, with the tape having a free end that extends through the housing's opening, plus the improvements yielded by: (a) configuring the housing sides to be tear-drop shaped with a tip end, and (b) locating the tape opening in a portion of the boundary edge proximate the tape's tip end.

In accordance with the present invention, a method and apparatus for estimating the noise and interference over the transmission band for OFDM systems are provided. Noise variance and signal-to-noise ratio (SNR) are important parameters for adaptive orthogonal frequency division multiplexing (OFDM) systems since they serve as a standard measure of signal quality. Conventional algorithms assume that the noise statistics remain constant over the OFDM frequency band, and thereby average the instantaneous noise samples to get a single estimate. In reality, noise is often made up of white Gaussian noise along with correlated colored noise that affects the OFDM spectrum unevenly. Provided is an adaptive windowing technique to estimate the noise power that takes into account the variation of the noise statistics across the OFDM sub-carrier index as well as across OFDM symbols. The proposed method provides many local estimates, allowing tracking of the variation of the noise statistics in frequency and time. A mean-squared-error (MSE) expression in order to choose the optimal window dimensions for averaging in time and frequency is derived.

A computer implemented method of finding commonalities among search terms within an electronic database, comprises the steps of: receiving at least two search terms from a user; performing an individual computerized search within the electronic database for each of the at least two search terms; generating a plurality of individual results for each of the at least two search terms; identifying at least one commonality mutually shared by at least two of the plurality of individual results; and presenting the at least one commonality. The at least one commonality can comprise a plurality of commonalities which can be ranked based on the number of search terms with which the commonality is associated, where the commonality associated with the greatest number of search terms is ranked highest. The ranking can be further based on frequency of the commonality across all individual results, link distance or other standard measures of commonality.

The present invention relates to a device for detecting flow standard by using image camera technique, belonging to the field of flow standard detection technology. Said device includes image camera type automatic reading system, software processing portion and image camera peripheral equipment whose action is controlled by software, in which the kernel portion is processing process of software, the fluid source is connected with detected meter. The flow meter for sampling detected meter by adopting image camera technique can adopt two lines to make connection, one line is connected with regulation module and another line is connected with identification module. Said regulation module is composed of sample collection unit, image processing unit and statistical template unit. The regulation data measured by said module can be connected with background database, then connected with matching unit. Said invention can be matched with various flow standard devices.

An automatic detection device for fuel tanker belongs to the technological field of fuel measuring. The device is characterized in that a hollow cylinder-shaped through tube is provided with a floating ball inside, the diameter of the floating ball is similar to that of the tube, a straight rod is arranged on the top of the floating ball vertically, a measuring head is fixed on the straight rod out of the through tube and is coated with a strip-shaped sensor head, the sensor head is connected with a ball nut arranged on a parallel ball screw rod, one end of the screw rod is connected with a micro-motor output shaft controlled by a portable computer, and the other end of the screw rod is provided with a coding-typed originator connected with an operation displayer; the cylinder-shaped through hole has a bottom with angle used for positioning of the starting point of the floating ball, and the through tube is communicated with a standard measuring cylinder and also participates one-step detection, which also belongs to capacity range. The beneficial effect of the present invention comprises that compared with traditional measurement method, the present invention has high measurement accuracy and measurement speed, simple procedure, small error and high efficiency; if the lifting rod on the floating ball is taken out and removed, traditional measuring method can be restored; the present invention is very practical.

The invention discloses a sensor linear correction method and device. The method comprises the steps of adopting a sensor to measure at least two standard measured objects to obtain corresponding correction measurement data; building a corresponding relation between actual data and the correction measurement data of all standard measured objects, and using two adjacent correction measurement data as a correction interval; measuring an object to be measured through the sensor to obtain corresponding real-time measurement data, and determining the correction interval into which the real-time measurement data falls; according to a linear relation of the correction measurement data which falls into the correction interval and the actual data corresponding to the correction measurement data and by combining the real-time measurement data, calculating the actual data of the object to be measured. In the sensor linear correction method and device, according to linear characteristics of the sensor itself, a multi-section type correction method is designed, the precision of the sensor in the correction process is drastically improved, and the testing precision and stability of a measurement system are improved.

The invention provides a method for measuring content of five saponin components in red ginseng roots. Ginseng saponin components of main effective active components of the red ginseng roots and are important standards measuring advantages and disadvantages of inner quality of the red ginseng roots. According to the method, ginseng saponin Rg1, ginseng saponin Re, ginseng saponin Rf, ginseng saponin Rb1 and ginseng saponin Ro in the red ginseng roots are simultaneously measured by the aid of an ultra-high performance liquid chromatography, and the method is high in sensitivity, accurate and reliable and can be used for controlling quality of the red ginseng roots.

The invention relates to the technical field of electromagnetic control, and provides an electromagnetic valve and an air gap control method of the electromagnetic valve. The electromagnetic valve comprises a valve seat and a valve core, wherein the valve core moves relative to the valve seat under the actions of a magnetic control unit and a reset unit, and closes or opens the electromagnetic valve; the valve core comprises an armature and a valve stem; the armature is provided with an assembly hole; and a first end of the valve stem is inserted into the assembly hole and forms an interference fit with the assembly hole. According to the electromagnetic valve, the valve core can adapt to the valve seats with different sizes only by adjusting the length of the valve stem in the valve core positioned outside the armature without arranging a plurality of valve stems or grinding the end surface of the valve stem; and the valve stem with proper length can be selected without the aid of any standard measuring stick. Therefore, the electromagnetic valve has the advantages of high production efficiency and low cost. Besides, since the first end of the valve stem is inserted into the armature, the problem of the abrasion of the contact part between the end surface of the armature and the end surface of the valve stem does not exist; and therefore, the electromagnetic valve has the advantages of stable performance and high reliability.

The invention discloses a machining and detection device and method of an engine oil supply support plate case. A plurality of support plate blades in the oil supply support plate case are arranged nonuniformly in the circumferential direction. At least one supporting plate blade is internally provided with a lubricating oil pipe. An outer case body is provided with an angular original point reference standard as a reference marker for machining and engine component assembling. An inner case body and the outer case body of the oil supply support plate case and the support plate blades between the inner case body and the outer case body are machined in a monoblock casting method. A support plate case blank is finally formed through machining. The support plate case prepared through the machining method conducts detection through a detection device and a standard measuring bar. By means of the device and method, the redesigned engine oil supply support plate case can be effectively guaranteed; it is guaranteed that parts of the manufactured oil supply support plate case meet the design requirements; meanwhile, the casting difficulty is reduced, the qualified rate of products is increased, and the cost is lowered.

An exemplary method for testing a video signal generator is provided. The method includes: setting test parameters of the video signal generator to perform a function test; generating signals based on the test parameters through the video generator; controlling a standard measuring apparatus to receive the signals and to convert the signals into test values; determining whether the video signal generator passes the function test by comparing the test values with a standard working range of the video signal generators; and generating a test report based on the test values and the test parameters. A system for testing a video signal generator is also provided. By utilizing the present invention, errors can be reduced and test efficiency can be enhanced.

The invention discloses a blade profile measuring-aided device with adjustable postures. The blade profile measuring-aided device with adjustable postures comprises a rotary body, a movable baffle block and a fixed baffle block are arranged on the rotary body, the movable baffle block is connected with the fixed baffle block through an orbit, the movable baffle block is matched with the fixed baffle block to fix a tenon of a measured blade, a bolt is arranged at the side of the movable baffle block and fixed on the rotary body through a bracket, the bolt can regulate the movable baffle block to clamp different sizes of blades, the rotary body is fixed on the adjustable pedestal through a press plate, the blade posture can be changed through regulating the rotary body, a standard measuring block is connected with a correction post, the correction post is fixed at one end of the adjustable pedestal, when using a comparison method to measure the blade, the standard measuring block serves as a measuring standard. The blade profile measuring-aided device with adjustable postures regulates the blade posture to meet the blade profile measuring posture requirement according to the size and oblique angle of the blade tenon; the blade profile measuring-aided device with adjustable postures can be used for the snap-gauge, three-dimensional and optical measuring methods for the blade, the workload of the operator is reduced, and the blade profile measuring precision and efficiency are improved.

The invention relates to a terahertz spectrum calibration system, comprising a laser light source, a terahertz wave generating unit, a detecting unit, terahertz optical paths, a collimating optical path, a transmission reflector, a light splitting element and a standard measuring tool. The system performs frequency calibration on a terahertz time domain spectrum by utilizing periodic oscillation of the standard measuring tool formed by multiple reflections in the standard measuring tool through a terahertz wave, and the system realizes indirect calibration between terahertz wave optical pathsusing homologous collimating lights by introducing a collimating optical path to make the terahertz wave be perpendicular to the standard measuring tool, thereby reducing spectral errors caused by non-normal incidence, and effectively improving the accuracy and reliability of the system. The invention also provides a terahertz spectrum calibration method, which performs spectrum calibration by theterahertz spectrum calibration system, and uses the collimating light reversely input into the terahertz optical paths to adjust the terahertz optical paths, so that the standard measuring tool is perpendicular to the terahertz wave, and the spectral errors caused by the standard measuring tool on terahertz tilt angles are reduced.

The invention provides a planar positioning compensation method for a motion platform system. The motion platform system comprises a motion platform and a measuring machine stand carrying out measurement on an object on the motion platform. The method comprises the steps of a, selecting a standard measuring instrument, and enabling the standard measuring instrument to move along with the motion platform, wherein the standard measuring instrument is provided with a plurality of precision equally spaced patterns; b, recognizing a recognition coordinate value of each pattern on the standard measuring tool in the motion platform by using a pattern recognition system on the measuring machine stand; c, fitting the pattern spacing and a modified coordinate value of each pattern according to the recognition coordinate values; and d, acquiring the compensation amount required at the position of each pattern according to a difference value between the modified coordinate value and the recognition coordinate value. A planar compensation table of the motion platform system provided by the invention can be carried out online, the axis orthogonality and the scale uniformity of the motion platform system can be compensated simultaneously, and further operating conditions can be updated on the basis of an original compensation table when the compensation amount changes.

The invention relates to an on-site transient overvoltage measuring method based on network transfer function calculation. The on-site transient overvoltage measuring method comprises the following steps that: (1) a transient overvoltage measurement voltage divider is built; (2) the simulated transient overvoltage is exerted or filled at one side of the transient overvoltage measurement voltage divider and is measured and recorded by a standard measuring system, the measuring value is the input x of the primary side of an on-site monitoring system, meanwhile, the measuring value of the on-site monitoring system is the output y, and the actual measurement of the transfer function H of the on-site monitoring system is carried out; (3) the actual measurement of the transfer function H of the built transient overvoltage measurement voltage divider is carried out and is recorded in the on-site monitoring system; and (4) a standard measuring system is removed, the on-site monitoring system operates, and the transfer function H replaces the transformation ratio K for calculation when the transient overvoltage is detected. The method provided by the invention has the advantages that the network transfer function H is used for replacing the transformation ratio K for the transient overvoltage calculation, and the problem of differences at each harmonic component can be solved.

The invention relates to a calibration method for a measuring probe for online measurement in a processing machine tool, which is used for carrying out calibration on an online measuring probe of a mechanical processing machine tool. The calibration method is characterized by comprising the steps of one, installing a standard measuring bar on a machine tool calibrated element, on which the standard measuring bar can be fixed, to act as a calibration reference; two, touching any positions of the standard measuring bar for multiple times by using the measuring probe, and recording coordinate data of the measuring probe in touch; three, processing the measurement data recorded in the step two, and fitting to acquire a semicircle outline; four, calculating position coordinates of the center by the semicircle outline acquired by fitting, and carrying out geometric processing on the center coordinates, the center and the radius of the standard measuring bar, and the radius of the measuring probe so as to acquire coordinates of the center of the measuring probe. The calibration method provided by the invention has the advantages of simple design structure and installation process, ability of saving the space and low cost.

The present invention provides an entropy-based component credibility measurement method, which includes: decomposing the main function points of the component; recording the credible evidence of each function point in the requirements stage, design stage, coding stage, and test stage; Calculate the trusted evaluation value Pi of each stage in the function point according to the recorded credible evidence; calculate the entropy of each function point; calculate the entropy of the component, and judge the credibility of the component. The measurement of the credibility in the invention focuses on the process evidence, quantifies the credibility index through the process evidence, and uses the information entropy as the credibility measurement standard to measure the credibility of the component more effectively.