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1287results about How to "Accurate measurement" patented technology

Method for automatically measuring human body dimensions on basis of three-dimensional point cloud data

The invention relates to a method for automatically measuring human body dimensions on the basis of three-dimensional point cloud data. According to three-dimensional human body point cloud data acquired by a laser three-dimensional color human body scanner developed on the basis of independent innovation, the original three-dimensional point cloud data is denoised and the like; and then human body dimensions, which are required by costume design, model measurement and the like and comprise height, body measurements and curve length, are acquired by automatically fetching human body characteristic points and characteristic sections. A measuring system adopted by the invention acquires three-dimensional human body outline data, which can reflect the body form of the human body best, by directly scanning the human body; joint points and outline convex points of the human body can be automatically fetched by a maximum and minimum measurement method and a most convex and concave point method; and characteristics and dimensions of the human body longitudinal sections and cross sections can be directly acquired. The method is convenient in operation, high in speed, high in measuring precision, high in repeatability and suitable for human body measurement on a large scale.
Owner:TIANJIN UNIV

Multi-blade multi-angle rock breaking device for rock ripper

The invention discloses a multi-blade multi-angle rock breaking device for a rock ripper. The device comprises a self-reaction force frame body, an annular confining pressure loading workbench, a Z-direction servo actuator, an X-direction servo actuator, a Y-direction internal servo actuator, a horizontal dual-layer linear guide rail, a three-direction pressure sensor and the like, wherein the lateral moving direction of a rock test piece is set as an axis X; the propelling direction of the rock test piece is set as an axis Y; a direction which is vertical to the breaking surface of the rock test piece is set as an axis Z; the X-direction servo actuator is arranged between the horizontal dual-layer linear guide rail and the annular confining pressure loading workbench; the Y-direction internal servo actuator is arranged between the horizontal dual-layer linear guide rail and the self-reaction force frame body; and the Z-direction servo actuator is arranged between a guide rail guide mechanism and the self-reaction force frame body. In the device, the annular confining pressure loading function of rock is simulated, so that the rock test piece is closer to real geological conditions, parameter measuring values such as a blade distance and the like are more accurate, the design level of the rock ripper is raised, and tunnel construction accidents are controlled.
Owner:SHENYANG HEAVY MACHINERY GROUP

Real-time automatic monitoring method and real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion

The invention provides a real-time automatic monitoring method and a real-time automatic monitoring system for underground light non-aqueous phase liquid pollutant dispersion. The method comprises the following steps: taking a monitoring point location; obtaining a resistance variation range E after characteristic LNAPLs pollutant and characteristic LNAPLs pollution is caused at the monitoring point location; determining the length of a resistance probe; determining a distance between electrode rings; hanging one set of resistance monitoring device in a monitoring well according to an underground water flow direction; respectively injecting at least one set of resistance monitoring device at monitoring point locations upstream and downstream underground water; setting collecting parameters; transmitting monitoring data in real time; and automatically alarming when the resistance reaches the lower limit of the E. The real-time automatic monitoring method provided by the invention has the advantages of simple operation, accurate measurement and reliable operation; data can be monitored in real time and wirelessly transmitted; the diffusion process of the LNAPLs after leaking can be dynamically monitored in real time; the redistribution process of the LNAPLs can be also monitored during extracting rainfall or underground water; and the real-time automatic monitoring method provided by the invention can be widely applied to dynamic monitoring of underground pollution after the LNAPLs is leaked in large-scale petrochemical enterprises, gas stations and so on.
Owner:OCEAN UNIV OF CHINA

On-chip antenna electrical property test system and method

The invention provides an on-chip antenna electrical property test system. A millimeter wave test system comprises a vector network analyzer, a millimeter wave controller, a triplexer, a millimeter wave receiving module, and an S parameter test module, and realizes signal generation and receiving measurement. A millimeter wave probe is in connection with the output port of the S parameter test module through a waveguide tube; a probe bench system and a microscope system are in mutual cooperation to realize reliable contact between a probe contact and an on-chip antenna feeding point; a three-shaft rotary table system comprises a lower orientation rotary table, a first L-shaped cantilever, a second L-shaped cantilever, a pitching rotary table, an upper orientation rotary table and a rotary table controller; the millimeter wave receiving module is installed above the three-shaft rotary table system; the input port of the millimeter wave receiving module is provided with a horn receiving antenna which aligns the on-chip antenna at the centre of sphere; a master control computer controls a whole system. The on-chip antenna electrical property test system can accurately measure the standing-wave ratio, directional diagram characteristics and gains of an on-chip antenna.
Owner:CHINA ELECTRONIS TECH INSTR CO LTD
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