33results about How to "Realize accurate measurement" patented technology

The embodiment of the invention provides an indoor three-dimensional modeling method and system. According to the embodiment of the invention, the collected point cloud data is used for registration,there is no need to calibrate the site, the data collection process is simplified, and the application range of the indoor three-dimensional modeling method is expanded. Besides, through inverted image deletion processing, the laser reflection influence in laser point cloud data acquisition is deleted, and the model reconstruction precision is improved. In addition, according to the embodiment ofthe invention, based on the reconstructed indoor three-dimensional model, the accurate measurement of the real indoor environment can be realized.

The invention discloses a technology for measuring and calculating tree ages. According to the technology, a mathematical model is established for the tree ages by acquiring the information of slope, exposure, elevation, thickness of soil, breast-high diameter and the like under standing tree growing conditions so as to acquire the tree ages. A mathematical inversion model is established by collecting the information of breast-high diameter, annual ring and growing conditions (slope, exposure, elevation, thickness of soil) of felled trees in the field, and then the tree ages can be calculated through the mathematical model by using the information of breast-high diameter, elevation, slope, exposure, thickness of soil and the like, wherein the information is measured and calculated in the field. The technology for measuring and calculating the tree ages greatly improves accuracy in calculating the tree ages and overcomes the shortcoming that the existing methods of hewing down analytic trees, turning intake growth cones and the like are large in destructiveness, tedious in process and the like.

The invention provides a tree crown volume and surface area metering technology taking a three-dimensional laser scanner as a tool. The three-dimensional laser scanner is used as the tool to measure tree point cloud data and a peripheral point cloud in the tree point cloud data is extracted through an algorithm; and the measurement and calculation of a tree crown volume and a surface area can be realized through a computational formula, so as to greatly improve the computational accuracy of the tree crown volume and the surface area, and overcome the defects that the precision is low, and the process is complicated when the precision is high of a previous method for metering the tree crown volume and the surface area.

The invention discloses an earthwork measurement and calculation system based on an unmanned aerial vehicle surveying and mapping technology. The system comprises an image data collection unit, three-dimensional model making unit and an earthwork measurement and calculation unit. The image data collection unit is connected with the three-dimensional model making unit in series through utilizationof a circuit. The three-dimensional model making unit is connected with the earthwork measurement and calculation unit in series through utilization of the circuit. The three-dimensional model makingunit comprises an equipment selection module, a route planning module and a data collection module. The equipment selection module is connected with the route planning module in series through utilization of the circuit. The route planning module is connected with the data collection module in series through utilization of the circuit. The earthwork measurement and calculation unit comprises a data input module, a model making module, a data correction module and a model display module. The data input module is connected with the model making module in series through utilization of the circuit. The model making module is connected with the data correction module in series through utilization of the circuit. Through utilization of an unmanned aerial vehicle oblique photography technology, image data collection of earthwork is carried out, precise measurement and calculation are realized, and construction efficiency is improved.

The invention relates to a method of accurately measuring, in particular to a method of accurately measuring a map. The method of accurately measuring the map comprises the following steps of establishing a fitting relationship through utilizing pixel information data of characteristic points and pixel information data of measuring points, measuring geographical coordinate information data of measuring points according to the fitting relationship and the geographical coordinate information data of the characteristic points, measuring the length of line segments or the area of a polygon which is formed by a plurality of calculating points, and drawing on the map so as to precisely measure any deformation map losing a geographical reference system or a hand-painted map.

This invention discloses a precision measurement control valve. It is mainly consisted by a main body seat and main body cover, blade wheel, gear, fixed salver underdriving gear set, cam, control cylinder body, spring, handle and other components. Through underdriving gear set, flow velocity and speed reducing ratio of underdriving gear set is matched to realize precision measurement. When underdriving gear set rotates to setting position, valve closed signal is transferred by cam driven by underdriving gear set, then interval channel is closed through valve part to realize precision measurement control.

The invention discloses a multi-stage measuring system for the absolute azimuth angle of a high-speed moving rope, in order to achieve accurate measurement of the absolute azimuth angle of the detector hanging rope during the rapid movement of the detector in the horizontal direction; the measuring system includes Inclination measurement device and laser gyroscope; the inclination measurement device includes two universal joints, two encoders and steel pipes, and the measurement system is set on both sides of the reel in the fast follow-up system. When the rope is released, the inclination measuring device moves along the axial slide rail with the reel through the steel pipe, and the encoder can obtain the azimuth angle of the lifting rope relative to the disc in real time; the laser gyroscope is used to obtain the real-time attitude of the disc, and the encoder and The laser gyroscope transmits the measurement data to the ground controller through the cable respectively, and the controller calculates the absolute azimuth angle of the suspension rope in the geodetic coordinate system according to the superposition principle.

The invention discloses a multi-fault shear wave velocity testing system for a geotechnical model test. The system comprises a main control assembly, a signal generation and excitation channel scheduling assembly, a bending element and support frame assembly and a receiving channel scheduling and data acquisition assembly. The main control assembly is electrically connected with the signal generation and excitation channel scheduling assembly and the receiving channel scheduling and data acquisition assembly, the signal generation and excitation channel scheduling assembly is electrically connected with the bending element and support frame assembly, and the bending element and support frame assembly is electrically connected with the receiving channel scheduling and data acquisition assembly. The system has the effects that the problem that the shear wave velocity is difficult to accurately measure in indoor geotechnical model tests such as model pile penetration is solved. Accurate measurement of multi-fault shear wave velocity distribution is achieved, and the method is suitable for ground geotechnical model tests and centrifugal model tests. Different geotechnical model test requirements such as a model pile penetration test can be met, the device can be repeatedly applied to different test occasions, and the test cost is reduced.

The invention discloses a method for monitoring coal type layering in coal bunkers in real time. The method comprises the following steps of S1, tracking the flow direction of fire coal by utilizing fuel features; S2, uploading accumulative coal quantity data of an electronic belt scale for coal as fired to a PI database of an SIS system of a power plant in real time, updating the working state ofa coal plough in a coal bunker to the PI database in real time, and updating data of a coal level meter in the coal bunker and flow data of a coal feeder in the coal bunker to the PI database in realtime; S3, calculating a coal quantity Wi of the upper bunker of each coal bunker and simultaneously following coal type and coal quality data information of the upper bunker; S4, establishing a mapping relationship between the coal level and the coal quantity of the coal bunker, namely, a coal type level and quantity corresponding model; and S5, analyzing the coal level change of each coal type in the coal bunker in real time in the operation process of the coal bunker according to the state of the coal plough, the instantaneous flow rate of the coal feeder and the data of the coal level meter. The method has the beneficial effect of obtaining and displaying the layer distribution condition of each coal type in the coal bunker in real time.

The invention discloses a structure bending moment measuring device under a pure bending condition, and the structure bending moment measuring device is suitable for pure bending loading and bending moment measuring of mechanical parts. The structure bending moment measuring device is mainly composed of two sets of same torque measuring devices, a guide rail and a base, wherein the two sets of torque measuring device are the same in assemblies, and each torque measuring device comprises a rotating shaft, a driving motor, a speed reducer, a torque sensor, an adjustable clamp, a fixing frame, abase, an angle control panel, a jackscrew and a buckle. And the driving motor provides power with controllable size and stable operation for the rotating shaft. The speed reducer, the torque sensor and the adjustable clamp transmit motor power to the two ends of a to-be-tested piece, and pure bending is achieved. According to the device, a loading system and a measuring system are integrated together, so that bending moment at two ends of the test piece is continuously and accurately acquired while pure bending loading of the test piece is realized. Meanwhile, the device is simple to operate and suitable for test pieces of any configuration. The device has certain theoretical significance and practical application value.

The invention provides a transplanter vibration detection system and detection method based on an electromagnetic induction principle. In the transplanter vibration detection system and detection method, a blade wheel of an electric generator simulates a waterwheel construction; the blade wheel rotates following beating of a vibration rod and drives a coil to make movements of cutting a magnetic induction line through a driving belt and a drive shaft so as to generate current, and then the current is finally transmitted to a stub. As a laser sensor has high flexibility and can realize non-contact accurate measurement, the transplanter vibration detection system and detection method based on an electromagnetic induction principle can use the stub to block a laser signal so as to enable a microprocessor to obtain a discontinuity image, thus enabling an alarm to give an alarm to prove that an object to be measured generates vibration.

The invention is applicable to the technical field of curved-surface part measurement, and provides a reflective curved-surface part measuring method based on a combination of light vision and conoscopic polarization. The reflective curved-surface part measuring method comprises the steps of: A, carrying out modeling; b, performing modeling analysis; c, respectively measuring a polyhedral standardblock by using a surface structured light vision sensor and a conoscopic polarization holographic sensor, so as to determine corresponding point sets of point cloud data P1 and P2; d, geometrically processing the point cloud data obtained in the step C by using a point cloud processing assembly, performing influence overlapping comparison on three-dimensional modeling in the steps A, B and C, andconducting confirmation comparison on modeling data in the steps by adopting a coordinate system rotation method; and measuring a complex curved-surface part by using a method of combining surface structured light with conoscopic polarization holography, synthesizing the obtained three-dimensional point cloud data under the same coordinate, and finally acquiring complete three-dimensional point cloud data of the part. Therefore, the reflective curved-surface part measuring method can realize effective measurement of the reflective curved-surface part, and can improve the measurement efficiency and measurement precision.

A water and fertilizer integrated intelligent irrigation system is used for achieving intelligent irrigation of water and fertilizer. The system comprises an online detection system, a water and fertilizer preparation system and a disinfection recycling system, wherein a water and fertilizer main pipeline communicates with a plurality of water and fertilizer branch pipelines, the water and fertilizer branch pipelines are in one-to-one correspondence with crop units, a first measurement pipeline obtains water and fertilizer from the water and fertilizer main pipeline and conveys the water and fertilizer to a control chamber, a second measurement pipeline obtains water and fertilizer from the water and fertilizer branch pipelines and conveys the water and fertilizer to the control chamber, and a third measurement pipeline obtains water and fertilizer from a recycling pipeline and conveys the water and fertilizer to the control chamber; soil analyzers are in one-to-one correspondence withthe crop units, the soil analyzers are in signal connection with a PLC, and the PLC is in signal connection with pipeline switches arranged on the water and fertilizer branch pipelines; the water andfertilizer preparation system is used for preparing water and fertilizer required by crops by accurately measuring solid fertilizer; and the disinfection recycling system comprises a collecting mechanism, a collecting box, a disinfection box and a recycling tank. The water and fertilizer with required fertility can be prepared according to the requirements of crops, the water and fertilizer can be recycled and subjected to disinfection recycling, and resources are saved.

The invention discloses a device and method for measuring columnar water inflow quantity of a tunnel. The device comprises a water collection bag with a water receiving port; a weighing sensor which is used for measuring bearing water inflow weight in the water collection bag and installed in the water collection bag; and a timer for measuring water inflow time. The columnar water inflow quantity of the tunnel is calculated according to the formula that the columnar water inflow quantity=the water inflow weight measured by the weighing sensor / (water inflow density*water inflow time). Through arranging the weighing sensor and the timer, the columnar water inflow quantity of the tunnel can be measured accurately, and errors caused by human experience determination are prevented. The water collection bag is telescopic and elastically arranged, the volume of the water collection bag can be randomly changed, and the device is convenient to carry and operate. The device is simple in structure, easy to implement, relatively low in production cost, and good in practicability.

The invention provides a measurement method, and relates to the field of ship manufacturing. The measurement method comprises the following steps: carrying out an error confirmation step: obtaining an allowable installation error of an installation position relative to a reference position based on connection strength requirements of a first plate, a second plate and a third plate; carrying out a calibration step: to be specific, acquiring the position of the third plate, and setting the reference position to be deviated by a calibration distance relative to the third plate in the direction deviating from the plate face of the third plate; carrying out a measuring step: to be specific, arranging a measuring tool, attaching one side part of the measuring tool to one of the first plate and the third plate, and carrying out measuring together with the side part by utilizing a part, which is separated from the side part, of the measuring tool so as to obtain an actual distance between the mounting position and the reference position; and calculating whether deviation of the actual distance from the calibrated distance satisfies allowable installation error. According to the measurement method provided by the invention, the problem that the error is relatively large when the distance between the reference position and the installation position is measured is solved, and accurate measurement of the installation error is realized.

The invention discloses an 8 electrode intelligent body fat bracelet, and particularly relates to the technical field of intelligent wearable body fat measurement. The 8 electrode intelligent body fatbracelet comprises a ring body and a body fat scale. One end of the ring body is fixedly connected with a first ring belt, and the other end of the ring body is fixedly connected with a second ring belt. A current conversion module generates a testing mode of multi-frequency alternating current signals, according to alternating current signal testing in the testing mode, the alternating current signals are adopted for analyzing internal components of the human body, the alternating current signals can reflect the components of the human body more truly compared with direct current signals, according to another multi-frequency testing, the alternating current signals at multiple frequency bands are adopted for analysis, components of intracellular fluid and extracellular fluid can be distinguished, meanwhile, in combination with body fat measured data of the body fat scale, whole body detection is equivalently completed, thus, a precise detection result is obtained, compared with the previous direct current signal detection technology, the testing time is shorter, the product power consumption is lower, the detected data size is larger, and obtained analysis result data is more accurate.

The invention provides an LC passive wireless two-parameter sensing device based on PT symmetry. The sensing device comprises an LC two-parameter sensor (2) and a reading circuit (1); the LC two-parameter sensor (2) and the reading circuit (1) carry out energy coupling and signal transmission through inductive coupling; the control circuit (3) controls the reading circuit (1). A single-chip microcomputer in the control circuit can detect whether the voltage amplitude and the frequency meet a PT symmetrical state or not, namely whether the voltage amplitude reaches the maximum or not and whether the frequency is divided or not, an adjustable capacitor is adjusted in a stepping mode till the system reaches the PT symmetrical state, and then detected parameters are detected by detecting a frequency value and a negative resistance value of the system. The device is simple in structure, can detect two parameters, saves the space, and reduces the cost.

The invention relates to a method of accurately measuring, in particular to a method of accurately measuring a map. The method of accurately measuring the map comprises the following steps of establishing a fitting relationship through utilizing pixel information data of characteristic points and pixel information data of measuring points, measuring geographical coordinate information data of measuring points according to the fitting relationship and the geographical coordinate information data of the characteristic points, measuring the length of line segments or the area of a polygon which is formed by a plurality of calculating points, and drawing on the map so as to precisely measure any deformation map losing a geographical reference system or a hand-painted map.

The invention provides a system for accurately measuring and automatically correcting the liquid level of an absorber oil regenerator in a crude benzene coking unit system. The system comprises a liquid level transmitter and a liquid level switch, wherein the differential pressure transmitter and the liquid level switch are both connected with a DCS; the liquid level transmitter is mounted at the bottom of the absorber oil regenerator and is used for measuring the liquid level of the regenerator in real time; and the liquid level switch is mounted at the upper part of the wash oil regenerator, and a height difference between the liquid level switch and the liquid level transmitter is H. According to the invention, when the DCS detects that the liquid level switch is ON, density correction calculation is triggered, the liquid level height h measured by the liquid level transmitter is compared with the height H of the liquid level transmitter, the height H serves as a correction value, and a new liquid density value rho1 is calculated; the new liquid density value rho1 is substituted into the liquid level calculation of the liquid level transmitter in the next round; and whenever the liquid level of the regenerator reaches the height position of the liquid level switch, the DCS corrects the measured value of the liquid level transmitter once by using the height difference H, so the accurate measurement of the liquid level is realized.

The invention relates to a calculating and measuring method for space environment effect of forest vegetation. The calculating and measuring method comprises the following steps: designing a research space taking a proper scale value as a grid; establishing a forest space effect model; determining the parameter values in the model by means of extraction of remote sensing image data or ground survey; calculating the vegetation space effect of a research area according to the model. According to the calculating and measuring method, the defects that space environment effect data of the forest vegetation are difficult to acquire, the quantified calculation and measurement is difficult to realize, and research on environment factors is simplex are overcome; the efficiency and precision are improved; accurate measurement on the vegetation environment effect with multi-factor environment parameters is realized.

The invention belongs to the technical field of prestress jacks, and particularly discloses a prestressed jack piston cylinder displacement measuring device and a measuring and calculating method. The system comprises a data collecting module, a data processing module and a central processing module, and the data collecting module is used for collecting pressure and flow information of a jack hydraulic system; the input end of the data processing module is connected with the output end of the data collecting module, the data processing module is used for acquiring acquired information and performing analog-to-digital conversion and signal enhancement processing on the information, and the input end of the central processing module is connected with the output end of the data processing module; and the central processing module is used for receiving the processed information and converting the processed information to obtain the stroke displacement of a jack. According to the prestressed jack piston cylinder displacement measuring device and the measuring and calculating method, through the cooperation of the modules, accurate measurement of the stroke displacement of a piston cylinder of the jack is realized.