4002results about How to "Improve measurement accuracy" patented technology

The invention discloses a resolving power measuring device and a resolving power evaluation method for a three-generation dim light image intensifier, and belongs to the field of optical measurement and metering. The resolving power measuring device is characterized by consisting of a light source component, a resolving power target, a collimator tube, an imaging objective lens, a test camera obscura, a charge coupled device (CCD) camera and a computer. The resolving power evaluation method comprises the following steps of: imaging the resolving power target irradiated by a standard light source to a fluorescent screen by using a measured image intensifier; converting into a frame image of a target line by using the CCD camera, and transmitting into the computer; successively processing asingle frame image of the target line by using a normalized cross correlation model and an optical modulation degree model through internal image processing software of the computer to acquire a single frame processing result; and analyzing multi-frame processing results and performing corresponding supplement operation to acquire a final resolving power evaluation result. By the device and the method, the problem of objective evaluation during resolving power measurement of the three-generation dim light image intensifier is solved; and the device and the method can be popularized to other measurement fields such as an intensified charge coupled device (ICCD) measurement field and the like where resolving power is required to be objectively evaluated, and have wide application prospects.

A stereoscopic vision detecting method for measuring three-dimensional morphology on a strong reflection surface is provided. A traditional stereoscopic vision detecting method based on the sine stripe projection comprises steps of stripe projection, image collection, phase resolving, stereoscopic matching and three-dimensional recurrence, and the invention adds new technologies, such as bright-dark stripe projection, image collection in long exposure time, image synthesis within high dynamic range and the like in the steps of the strip projection and the image collection, which overcomes saturated or darker stripe images caused by the strong reflection surface, and can realize the non-contact optical measurement of three-dimensional morphology on the strong reflection surface such as metal. The detecting method has the characteristics of simpleness, flexibility and excellent reliability, and can be used for the optical non-contact measurement of three-dimensional morphology on the strong reflection surface such as metal.

The invention relates to the technical field of articles for daily use, in particular to a multifunctional intelligent insole and a gait similarity detection method. The multifunctional intelligent insole is convenient to use, light, convenient to carry, flexible to use and multifunctional, and has a series of functions of weighing, step counting, distance measuring, calorie consumption measuring, lostness prevention, warning while people fall off and wireless data transmission. According to the method, step postures and coordination of a detected object are judged mainly by analyzing triaxial accelerated speed, triaxial angular speed and pressure information of three positions of feet when the detected object moves, accordingly incorrect or abnormal gaits can be effectively found and corrected, and the insole has important application value for dancing lovers, babies learning to walk and patients walking for rehabilitation. Meanwhile, the gait detection method can be matched with an intelligent system for use, and test results can be presented to users visually through an intelligent terminal device.

A club shaft that can be installed in a club head permanently or can be installed in clubs with interchangeable shaft features is disclosed herein. The invention is a measurement system that enables the capturing of the speed and motion of the golfer's swing. The invention uses magnetic material positioned on a face of a golf club head and an array of magnetic sensors.

The invention belongs to a calibration method of an error which is measured by a multi-position strapdown north seeking device, in particular to a calibration method of orientation effect of a multi-position strapdown north seeking device. A true north prism, two theodolites and a mechanical dividing rotating platform are used as auxiliary testing tools, the multi-position strapdown north seeking device is fixed on the mechanical dividing rotating platform, and is divided according to one circle equipartition point, an angle of a benchmark prism of a strapdown north seeking system and the true north direction is defined through rotating an equipartition angle value at one time by the mechanical rotating platform and through the true north prism system in an initial rotating position of the north seeking system, and then the angle is compared with a north-oriented value which is measured by the strapdown north seeking system, the error is calculated, and an azimuthal effect of a gyroscope which is simulated according to the characteristic of the error is marked. The invention effectively eliminates measuring error which is caused by the azimuthal effect, thereby improves the measuring accuracy of the multi-position strapdown north seeking system.

The invention relates to a digitizing detection method of a complicated curved face. The method comprises the following steps: (1) extracting the geometric data of a CAD model of the complicated curved face, establishing an NURBS theoretical model of the complicated curved face, measuring a part object with the curved face by a three-coordinate measuring machine, digitizing the surface of the partto obtain the parameter of a measuring point; (2) establishing a binary nonlinear mathematical model with the minimum distance from the measuring point to an isoparametric line areas of the curved face by searching two groups of isoparametric line areas with isoparametric line structure proximate to the measuring point on the CAD curved face; and (3) calculating the shape error of the complicatedcurved face by a genetic algorithm to realize the error estimation of the complicated curved face. Compared with the prior art, the invention establishes an accurate curved face theoretical model, enhances the searching efficiency, can ensure the acquisition of a globally optimal solution and lightens the measuring intensity.

The disclosed measuring apparatus and method for frictional moment comprise: the target bearing with diameter as D is suspended a segment nylon wire with ends connected to weight and dynamometer respectively, when bearing static, the show value on dynamometer as A1 balances to the weight; if rotating toward one direction by some rate, the show value increases to A2, and the formula M=(A2-A1) .D / 2 can express the corresponding frictional moment. This invention is reliable, simple, and well practical.

Provided is a location measurement method of a mobile node using a predictive filter is provided for improving the location measurement accuracy of the mobile node. The location measurement method of a mobile node detects change of movement pattern of the mobile node, corrects weights of a location measurement period and a predictive filter depending on the change of movement pattern, and compensates a location of the mobile node using the corrected weights of the location measurement period and predictive filter.

The invention discloses a plate clamper platform for a falling weight impact test, and an impact speed measurement method. The plate clamper platform comprises a clamper structure, a supporting lifting structure and a laser sensor, wherein the clamper structure comprises a plate clamping device, a multi-angle rotation device and a clamper bottom plate, the multi-angle rotation device comprises wall plates, wall plate bolts and a bottom plate bolt, each wall plate is provided with a central hole and two arc-shaped grooves, the two arc-shaped grooves are symmetrically arranged relative to the central hole, clamping plates can rotate along the arc-shaped grooves after the wall plate bolts are completely loosened, the supporting lifting structure comprises a platform and a lifting driving device, the clamper bottom plate can rotate by adopting the bottom plate bolt as the center and can slidably move along a straight strip hole, and the laser sensor is arranged below the weight tray positioned on the periphery of a hammer head. With the plate clamper platform and the impact speed measurement method of the present invention, the composite material plate specimen can be tightly clamped, the multi-angle impact on the specimen can be achieved, and the speed change during the drop hammer falling and impact process can be real-timely measured.

The invention relates to a rapid width measurement system for tobacco shreds, which is mainly composed of an image filtering and region segmentation unit, a subimage contour extraction unit and a single tobacco shred width calculation unit. By using the advanced computer technology, image recognition technology and real-time digital image processing technology, the invention can realize the rapidand accurate width measurement of a large number of tobacco shreds. By using the invention, multiple tobacco shreds can be measured in one step, and the average width and variability of each tobacco shred can be rapidly and accurately calculated. The invention has the characteristics of simplified equipment structure, accurate width measurement of tobacco shreds and high measurement efficiency.

The invention discloses a time difference type ultrasonic flowmeter measuring method based on zero point analysis. The time difference type ultrasonic flowmeter measuring method based on zero point analysis is a method for accurately determining fair-current transmission time and countercurrent transmission time through a zero point analysis method. The time difference type ultrasonic flowmeter measuring method based on zero point analysis comprises the steps that (1) after a pulse drive signal is sent out, an A / D converter is started to conduct data collection; (2) a zero point value is searched; (3) whether a zero point is an ultrasonic signal zero crossing point or not is judged; (4) a first zero crossing point in an ultrasonic receiving signal is selected so that the ultrasonic signal arriving time can be determined and the fair-current transmission time and the countercurrent transmission time can be calculated; (5) instant flow of a section to be measured is calculated through the fair-current transmission time and the countercurrent transmission time. The zero point of the ultrasonic signal is not influenced by the external environment, the zero point can be detected even under the conditions that the signal is weak, fluctuation is large and interference is strong, the fair-current transmission time and the countercurrent transmission time of the ultrasonic signal in fluid can be accurately measured, the measuring accuracy of a time difference type ultrasonic flowmeter is greatly improved, and the problems brought by an existing threshold value comparing method are thoroughly solved.

The invention provides an on-line corrosion detector for reinforced concrete based on a disk electrode. The on-line detector comprises a polarization circuit (2) and a current constraint circuit (3), wherein the disk electrode (1) comprises reference electrodes RE1, RE2 and RE3, an auxiliary electrode CE (13) and a circular ring electrode GE (17); the polarization circuit (2) polarizes the reinforcing steel bars in concrete through the auxiliary electrode CE (13) and the reference electrode RE1 in the disk electrode (1); and meanwhile the current constraint circuit (3) restrains polarization current through the circular ring electrode GE (17) and potential difference between the reference electrodes RE2 and the reference electrodes RE3 so as to limit the polarization current in a projection zone of the auxiliary electrode CE (13). The invention further provides a method for measuring corrosion rate of the reinforcing steel bar in a concrete structure by using the detector. The invention improves measurement accuracy of the corrosion rate of the reinforcing steel bars in the concrete structure and avoids measurement errors caused by current over-constraint and under-constraint.

The invention discloses a phase noise measurement method based on radio frequency cancellation. The method comprises the following steps: dividing reference microwave signals at the same frequency as to-be-measured microwave signals into two channels; using one channel of reference microwave signals to cancel the to-be-measured microwave signals so as to convert carrier phase modulation by phase noise into suppression of carrier amplitude modulation; then, performing coherent demodulation on the canceled signals and the other channel of reference microwave signals; and finally, making a spectrum analysis of the low-frequency component of the signals after coherent demodulation to get the phase noise of the to-be-measured microwave signals. The invention further discloses a phase noise measurement device based on radio frequency cancellation. Compared with the prior art, the measurement sensitivity is higher, and the calibration process is easier.

An apparatus including a chamber that defines an internal cavity therein, adapted to enclose the device under test, and including walls of an inwardly reflective material, rendering the walls reflective to electromagnetic waves, thereby simulating a multi-path environment. Thus, the chamber is a reverberation chamber. At least one moveable object and chamber antenna are arranged in the cavity. A measuring instrument is connected to the device under test and the chamber antenna, for measuring the transmission between them. Further, an improved antenna holder is disclosed, comprising three surfaces of a reflective material, said surfaces extending in planes which are orthogonal in relation to each other and each surface facing away from the other surfaces, and wherein a chamber antenna is arranged on each of said at least three surfaces. Other improvements relate to video surveillance, channel emulation and shielding.

The invention relates to a dual-detector segmenting gamma-scanning measuring device based on equivalent radius correction, belonging to the technical field of nuclear radiation measurement. The dual-detector segmenting gamma-scanning measuring device comprises a rotary table, a detector platform assembly, a transmission source platform assembly, a platform lifting and driving assembly, two same high-purity germanium detectors, a transmission source, a shielding part of the transmission source and an analysis module, wherein the two same high-purity germanium detectors are provided with collimators. In the invention, the influence of the nonuniformity of materials inside a wastebin is reduced through the constant rotation of the wastebin, layered measurement is carried out on the wastebin undergoing the constant rotation by placing the two same high-purity germanium detectors on different horizontal positions, the radial equivalent radius of each radionuclide layer is obtained through analysis, and the radionuclide activity of the radionuclide layer is accurately computed according to the detection efficient of the radial equivalent radius. Because an assumption of uniform radionuclide distribution is eliminated, the characteristics of an actual wastebin are better accorded with so that the measurement accuracy of the traditional segmenting gamma-scanning technology is greatly enhanced.

The present invention provides elastic constant and visco elastic constant measurement apparatus etc. for measuring in the ROI in living tissues elastic constants such as shear modulus, Poisson's ratio, Lame constants, etc., visco elastic constants such as visco shear modulus, visco Poisson's ratio, visco Lame constants, etc. and density even if there exist another mechanical sources and uncontrollable mechanical sources in the object. The elastic constant and visco elastic constant measurement apparatus is equipped with means of data storing 2 (storage of deformation data measured in the ROI 7 etc.) and means of calculating elastic and visco elastic constants 1 (calculator of shear modulus etc. at arbitrary point in the ROI from measured strain tensor data etc.), the means of calculating elastic and visco elastic constants numerically determines elastic constants etc. from the first order partial differential equations relating elastic constants etc. and strain tensor etc.

The invention discloses a two-interface cementing strength testing device of a cementing sheath containing hydrates and an ice stratum. The testing device comprises a kettle shell base and a simulation sleeve which is vertically arranged in the middle of the kettle shell base. A polyvinyl alcohol membrane tube is arranged on the periphery of the simulation sleeve, an annular cavity is formed between the simulation sleeve and the polyvinyl alcohol membrane tube, a temperature control circulating bath sealing cover is arranged on the outer edge of the top of the kettle shell base in a surrounding mode, the position between the temperature control circulating bath sealing cover and the polyvinyl alcohol membrane tube is filled with a simulation stratum, the top of the simulation stratum is covered with a stratum kettle cover, the top of the simulation sleeve is covered with a pressurizing kettle cover which covers the top of the cavity, and a pressure device for pressurizing the pressurizing kettle cover is arranged above the pressurizing kettle cover. The testing device has the advantages that the structure is simple, installing and using are convenient, production cost is low, and a detection result is accurate and reliable.

The invention relates to a grinding wheel external circle run-out detection method based on a laser displacement sensor. The grinding wheel external circle run-out detection method comprises the detecting step of: firstly, installing the laser displacement sensor in front of the external circle surface of a detected grinding wheel, and connecting circuits of detection equipment; determining a signal sampling frequency and a sampling length of each measurement of the laser displacement sensor according to measurement conditions of the detected grinding wheel; setting the signal sampling frequency fk and the sampling length Ls of the laser displacement sensor through computer software; inputting the signal sampling frequency fk and the sampling length Ls into a controller of the laser displacement sensor; and detecting the external circle surface of the detected grinding wheel by using the laser displacement sensor during the rotation of the detected grinding wheel, sampling data and transmitting the data to a computer, and processing and analyzing the sampled data to obtain an external circle run-out value of the detected grinding wheel finally. The grinding wheel external circle run-out detection method based on the laser displacement sensor achieves the real-time and precise measurement of radial run-out of the external circle of the grinding wheel.

The present invention relates to a method and apparatus for quantitatively measuring a metal phase contained in a galvanized layer by X-ray diffractometry, and a method of producing a galvanized steel sheet by using the method and apparatus. The diffracted X-ray intensity from a metal phase contained in the galvanized layer is increased to improve measurement accuracy, thereby permitting application to on-line measurement. The diffracted X-rays from the metal phase are measured over a predetermined range on a Debye ring, or measured at a plurality of positions on the Debye ring to increase the diffracted X-ray intensity, thereby improving measurement accuracy. The X-ray beam produced by an X-ray source is compressed and made parallel and monochromatic by a multilayer film mirror to increase diffracted X-ray intensity, improving measurement accuracy. Particularly, the present invention is applied to measurement of the degree of alloying of hot-dip galvanization.

An improved rheometer plate includes a smooth sensing surface with monolithically integrated miniature pressure sensors which do not interfere with the smooth surface. Pressure sensing diaphragms formed by the smooth surface deflect in response to local pressures against the surface to enable the measurement of unperturbed local pressures of materials sheared between plates. The pressure sensors are sufficiently small that measured pressures are considered to be significantly local properties compared to the size of the plate. Normal stress differences and viscosity of fluid are measured accordingly. The membrane covers a plurality of wells or recesses with pressure sensors located in the wells to measure the deflection of the membrane over the wells. Capacitive or other sensors may be used. The rheometer plate can be used as part of a slit rheometer with a slit of varying dimensions.

The composition of an optical fiber sound sensor is that a light source module is connected with a first port of a fiber synthetic wavelength element, the third port of said fiber light element is connected with a non-intrisic fiber Fabry-Perot interference sensor head by fibers, the second port of the light element is connected with the first port of the fiber splitter and the second port of which is connected with an adjustable fiber band-pass filter, which is connected with a first photoelectric detection unit, the third port of the splitter is connected with a second photoelectric detection unit, a driver of the filter is connected with the signal process and control unit and the first and second detection units are connected with said signal and the control units. This invention is a sound sensor with automatic stable orthogonal working points.

A method of using photoelectric catalysis to detect chemical oxygen demand includes carrying out photoelectric catalytic reaction in a thin microreactor, using Ti as positive electrode, using TiO2 nanotube array film on metal Ti as light catalyst, using metal Pt as pair electrode and Ag / Ag CI as reference electrode, using inert inorganic salt as electrolyte, determining COD value by measuring Coulomb electricity value at time when organic substance of water sample in reactor is totally catalyzed and oxidized.

The present invention provides methods and system for improving the accuracy of measurements made using optical metrology. The present invention relates to methods and systems for changing the optical properties of tunable resists that can be used in the production of electronic devices such as integrated circuits. Further, the invention provides methods and systems for using a modifiable resist layer that provides a first set of optical properties before exposure and a second set of optical properties after exposure.

The invention provides a magnetic measurement apparatus based on atomic quantum effects, which is different from a present apparatus of measuring magnetic field strength. The method and apparatus of the invention utilize the energy level fission of high excitation state atoms caused by the Zeeman effect under the effect of a weak external magnetic field, and accurately controls the excitation frequency of an ultra-narrow line width laser to measure the spectral signal division based on EIT under the magnetic field effect. The intensity of a magnetic field to be measured can be calculated according to a division width. The multiple fission of the atomic magnetic energy level caused by the weak magnetic field Zeeman effect is linear, and accordingly, through fitting measurement results of widths of a plurality of division peak values, the self calibration of the intensity of the measured magnetic field can be realized. The new magnetometer can realize magnetic field intensity measurement with the sensitivity less than 0.1 T, and effectively improve the measurement precision with the further compression of a laser frequency line width. Moreover, the measured magnetic field strength can be effectively traced to an atom transition frequency, and excellent measurement accuracy and self-calibration can be realized.

The invention provides a method for determining the phase balance condition of gas hydrates, which mainly has the procedures: gas to be measured is caused to generate hydrates in a reaction kettle which is provided with a temperature measurement system, a pressure measurement system and an exhaust system; gas-phase space in the reaction kettle is compressed; system temperature in the reaction kettle is regulated to the temperature of the phase balance condition to be measured to exhaust the gas and lower the pressure, as well as the exhaust system is closed when the pressure in the reaction kettle rises at once because the exhaust is stopped, thus the reaction kettle is caused to become a closed system; the variation of the pressure in the reaction kettle is observed, if the pressure keeps invariant for a long time, three-phase balance is considered to be reached, at this time, the corresponding temperature and the corresponding pressure are a set of phase balance condition for the hydrates. The system temperature can further rise to the next balance temperature to be measured, the pressure variation is continuously recorded until the hydrates in the reaction kettle is completely decomposed, therefore, a series of phase balance condition data of the hydrates can be obtained. Adopting the method, the phase balance condition of the gas hydrates in a free water system or a porous media can be measured, and the measurement accuracy is high.

The invention discloses a coal-fired boiler coal quality on-line soft measurement method and system. The coal-fired boiler coal quality on-line soft measurement method includes the steps of (S100) the contents of the as received basis ash content Aar, the dry ash-free basis elemental carbon Cdaf and the dry ash-free basis elemental sulphur Sdaf are assumed; (S200) the uncompleted burned carbon consumption correction amount TCucr, the oxygen volume VO2-daf, the nitrogenn volume VN2-daf and CO2 volume gamma CO2, CO2 and SO2 gross capacity VRO2-daf are calculated according to the contents; (S300) iteration solving is carried out on the dry ash-free basis sulphur calculation value Sdafj, the dry ash-free basis carbon calculation value Cdafj and the fuel low-level heating amount calculation value Qarj according to the calculation values in the step (S200), and the values are output. Coal quality on-line soft measurement is achieved through the adoption of fire coal moisture on-line measurement information, boiler smoke data and unit running state data.

The invention discloses a global navigation satellite system (GNSS) receiver and a position measurement method. The GNSS receiver comprises a satellite receiving antenna, a laser ranging instrument, a posture sensor and a maser control board, wherein the posture sensor is used for receiving an azimuth angle, a pitch angle and a roll angle of the satellite receiving antenna. The maser control board is used for obtaining a longitude and latitude coordinate and an elevation coordinate of the phase center of the satellite receiving antenna, transforming the longitude and latitude coordinate and the elevation coordinate into a right-angle coordinate under a local coordinate system SG, obtaining coordinate offset of a measured point and the phase center according to the distance, the azimuth angle, the pitch angle and the roll angle between the satellite receiving antenna and the measured point, and calculating the right-angle coordinate of the measured point under local coordinate system SG. Compared with the prior art, the GNSS receiver improves accuracy of measurement, eliminates a centering rod simultaneously, and reduces the volume. In addition, during measurement, the longitude and latitude coordinate of the satellite receiving antenna has no need to be guaranteed to be identical with a longitude and latitude coordinate of the measured point, thereby reducing operation difficulties.

The probe tip movement control method of the scanning probe microscope is used for a scanning probe microscope provided with a cantilever 21 having a probe tip 20 facing a sample 12. The atomic force occurring between the probe tip and sample is measured when the probe tip scans the surface of the sample. X-, Y-, and Z-fine movement mechanisms 23, 29, and 30 are used to relatively change the positions of the probe tip and sample. It is possible to maintain a high measurement accuracy and enable scan movement of a probe tip on a sample surface by simple control when measuring a part having a gradient in measurement of an uneven shape on a sample surface.

The invention discloses an irregular Venturi flowmeter, comprising a Venturi tube and at least three pressure probes, wherein the Venturi tube is composed of a front straight tube section, a contraction section, a throat section, an expansion section and a rear straight tube section; all the sections are connected in sequence; the inner diameter of each of the front straight tube section and the rear straight tube section is D; the inner diameter of the throat section is d; each of the contraction section and the expansion section is conical; the structural parameters of the Venturi tube are as follows: beta=d / D=0.45 to 0.75, the length of the throat section is 2d to 8d, the conical degree of the contraction section is 10.5 degrees, and the conical degree of the expansion section is 7.5 degrees. The invention further relates to a method for measuring gas phase flow and liquid phase flow in moisture by utilization of the irregular Venturi flowmeter. The irregular Venturi flowmeter is especially suitable for measuring downhole moisture flow, and is especially used for monitoring the gas phase flow and the liquid phase flow in an underground connected well connecting a main gas reservoir with a related gas reservoir in the process of manual migration and development of related oil-gas reservoirs in real time.