63results about How to "Avoid low measurement accuracy" patented technology

The invention relates to a free stationing transformation monitoring method of a high-fill airport side slope unit set total station, and is used for effectively solving the accurate monitoring problems that a high-fill airport side slope is long and narrow, is a strip shape and is linear extension, and the graph intensity is poor. The monitoring method comprises the following steps of: dividing the involved range into a first measuring region, a second measuring region and a third measuring region from large to small, and setting a control point, a monitoring point and a turning point in each measure region, wherein the position of a survey station is freely selected; establishing a control net of the whole monitoring region, carrying out substation measurement on the control points and the monitoring points in the measuring regions, establishing a posture and oriented relation between adjacent survey stations, meanwhile, realizing larger expansion in an instrument measurement range; and taking the acquired horizon angle, a vertical angle and slant distance as observed values, taking a survey station position parameter and a monitoring point coordinate as an adjustment parameter so as to carry out parameter adjustment, and obtaining the precision result of the survey station position parameter and the monitoring point coordinate. The monitoring method provided by the invention has the advantages of high measuring accuracy, flexibility and convenience, convenience for carrying and good portability.

The invention relates to a tamping wagon photoelectric measurement system and a method. The system comprises a front measurement trolley, a middle measurement trolley, a rear measurement trolley, an optical imaging lens, CCD cameras and an illuminating light source, as well as an embedded processing platform and a signal cable, wherein the CCD cameras are connected with the embedded processing platform through the signal cable which contains synchronous signal wires ensuring that four CCD cameras start to shoot images at the same time; the embedded processing platform sends out a signal for the four CCD cameras to sample images synchronously through the signal cable; and the four CCD cameras send data of images which are shot synchronously, correspond to the illuminating light source and are imaged by an optical imaging lens to the embedded processing platform for coupling analysis, and the geometric position of a track circuit is calculated. The tamping wagon photoelectric measurement system can better adapt to the on-site requirement of the tamping wagon, and improves the measurement accuracy.

It is equipped with an injector body 4z which has formed therein high-pressure paths 6az, 6bz, and 6cz through which high-pressure fuel flows to a spray hole and stores therein a piezo-actuator 2z (i.e., an opening / closing mechanism) and a back-pressure control mechanism 3z (i.e., an opening / closing mechanism) which open or close the spray hole, and a fuel pressure sensor 50z installed in the body 4z to measure the pressure of the high-pressure fuel. The body 4z has formed therein a branch path 6ez diverging from the high-pressure paths 6bz and 6cz to deliver the high-pressure fuel to the fuel pressure sensor 50z.

A colorimetric instrument includes a power control section adapted to vary the power to be applied to the light source between the wavelengths in accordance with at least one of spectral characteristics of the light source, spectral characteristics of the measurement optical system, and light receiving sensitivity characteristics of the light receiving section.

The invention discloses a vision-based cutting width measurement method of an intelligent rice and wheat harvester, which comprises the following steps: according to an internal and external parametermatrix obtained by camera calibration, the world coordinate system is matched with a pixel plane coordinate system of a camera image, and an original rice and wheat image obtained by the camera is converted into a top view by using an inverse perspective projection; obtaining the actual target distance from the harvesting boundary line to the separator, obtaining the pixel width of the target area in the top view and determining the target area image by combining the reduction factor; Image preprocessing operation; the harvesting boundary line between harvested rice and wheat and unharvestedrice and wheat was extracted based on morphology, and the binary image of the target region containing the harvesting boundary line was obtained. Using probabilistic HOUGH transform method to detect the harvesting boundary line in the image and obtain coordinate parameters, the pixel distance from the harvester to the harvesting boundary line in the image can be obtained, and the actual cutting amplitude of the harvester can be calculated. The invention improves the reliability and can safely measure the cutting width of the intelligent rice and wheat harvester with high precision in real time.

The invention discloses a measurement method of the corrosiveness of an electronic and electrical appliance service environment. The measurement method comprises the following steps: placing a copper test piece into the measured electronic and electrical appliance service environment, reducing a corrosive product film on the surface of the copper test piece through a cathode reducing method, then calculating the average thickness TCuO2 of a Cu2O corrosion product, the average thickness TCuO of a CuO corrosion product and the average thickness TCu2S of a Cu2S corrosion product, and finally calculating the total thickness average value Te, serving as a measurement result, of a surface corrosion product to acquire the corrosiveness of the measured electronic and electrical appliance service environment. Therefore, the measurement method can accurately measure the weak corrosiveness of the electronic and electrical appliance service environment under a condition of not affecting the electronic and electrical appliance service environment, so that the problem of low measurement precision caused by the adoption of a copper hanging piece weight loss method for calculating the corrosion rate in the prior art is solved.

The invention relates to a portable device for generally surveying the eyesight of children. The device includes a display module for visualized operation and display of detection results, an image analyzing and processing module for analyzing and processing the obtained detection image and including a prime lens and an image sensor, an image obtaining module for system imaging and a light source module for providing a detection light source and a fixation light source for eyes of the child to be detected, which are sequentially installed in the same optical axis from left to right, wherein the light source module is composed of a light source main board and a light barrier which are coaxially assembled. According to the portable device for generally surveying the eyesight of the children, the light source module adopts a direct shooting manner, thus being simple in structure and easy to implement, and preventing the detection accuracy from descending by stray light; meanwhile the light source module adopts the manner of combining infrared light with visible light, the visible light is used for attracting the attention of the child to be detected, and the infrared light is used for detecting the eyesight; the portable device is designed aiming at the children with low cooperation capability or mentally deficient persons, and detection errors are reduced.

To provide a clamp-on type ultrasonic flow sensor capable of preventing deterioration in measurement accuracy of a flow rate due to deformation of a pipe. Elastic couplants CP1 and CP2 formed to surround the outer circumferential surface of a pipe are fixed while being pressed on the pipe P by fixing inner surfaces FS of two clamp members 131 and 132. An ultrasonic wave is propagated through the elastic couplants CP1 and CP2 and fluid in the pipe between a first ultrasonic element 101 and a second ultrasonic element 102. A cross section of the fixing inner surfaces FS of the clamp members 131 and 132 has a shape of a regular even-numbered polygonal shape centering on the axis of the pipe.

The invention relates to the technical field of distance measurement and discloses a distance measuring method and a distance measuring device. The distance measuring method comprises the following steps: obtaining a first state angle when a terminal is positioned in the first position B point and a second state angle when the terminal is positioned in the second position C point through detection, and calculating the rotating angle beta1 of the terminal changed from the first state angle to the second state angle according to the first state angle and the second state angle; calculating an included angle alpha 1 between a line segment A1B and a line segment BC according to first track information and first state angle information; obtaining distance x from the first position B point to the second position C point; and finally calculating distance LA1B between a to-be-measured point positioned in the position A1 and the first position B point through alpha 1, beta 1 and x to avoid theproblem of low measuring precision caused by the fact that the distance of a to-be-tested object is calculated through image distance, so that the terminal measuring distance precision is improved.

The invention discloses a method for measuring a cladding light proportion of a double-clad fiber laser. The method comprises: performing equal-ratio amplification imaging on the end face of the output fiber of the double-clad fiber laser by using a lens group; disposing a diaphragm with an adjustable aperture diameter on the image surface of the lens group; enabling the fiber core light in the output light of the double-clad fiber laser to pass through the diaphragm but enabling the cladding light in the output light of the double-clad fiber laser to be blocked by the diaphragm by adjusting the aperture diameter of the diaphragm; testing the power P1 of output light spot in front of the diaphragm and the power P2 of fiber core light spot behind the diaphragm to obtain the proportion of the cladding light of the output light of the double-clad fiber laser as (P1-P2) / P1. The method is large in measurement range, high in measurement precision, and can be used for measuring the cladding light proportion of a high-power double-clad fiber laser.

Provided is an optical coordinate measuring device that prevents deterioration in measurement accuracy. A holding member is made of a material having low moisture absorption properties and a small linear expansion coefficient. A marker member is held by the holding member. The marker member includes a plate member made of glass. A light shielding mask is formed by printing on one surface of the plate member except for a plurality of circular regions. A light emitting substrate is arranged below the marker member. A plurality of light emitting elements are mounted on the upper surfaces of the light emitting substrates.

A scale includes a platform, load sensors provided at four corners inside the platform, and a display unit. Each load sensor has an elongate load cell and a strain gauge. Each load cell is arranged such that its longitudinal direction is approximately orthogonal to the direction connecting heel and toe of the foot placed on the platform. The display unit is arranged at a central portion of the platform, and feet-receiving regions are set at opposite sides of the display unit. By such a structure, a scale allowing reduction in size while preventing degradation of measurement accuracy as much as possible can be realized.

The present invention discloses an electronic balance with a wireless transmitter. The electronic balance comprises an electronic balance body made of a superior dust-proof material which comprises an aluminum-magnesium alloy and a self-cleaning coating layer which is sprayed outside the aluminum-magnesium alloy. The aluminum-magnesium alloy comprises, by weight, 10% to 20% of magnesium, 1% to 5% of silicon, 0.5 to 1.5% of iron, 0.2% to 0.8% of copper, 0.1% to 0.6% of zinc, 0.8% -2.4% of titanium, and aluminum as a remainder. The electronic balance body is provided with a wireless transmitter and a USB interface. Through the above mode, the electronic balance with the wireless transmitter has a good dust-proof effect, the measurement precision decrease caused by dust accumulation can be effectively avoided, the electronic balance can communicate with a computer at the same time, the measurement data in the electronic balance is transmitted to the computer in real time, and the storage and management of the measurement data are facilitated.

An apparatus for optical measurement of a liquid or molten material, which has: a transparent container which has a bottom face and is capable of containing a to-be-measured material therein, with the bottom face at least having a flat face and being transparent; and an optical device that irradiates a light to the bottom face of the container and that detects and measures a reflected light from the bottom face; and a method for optically measuring a liquid or molten material using the apparatus.

Provided is an optical coordinate measuring device that prevents deterioration in measurement accuracy. A holding member is made of a material having low moisture absorption properties and a small linear expansion coefficient. A marker member is held by the holding member. The marker member includes a plate member made of glass. A light shielding mask is formed by printing on one surface of the plate member except for a plurality of circular regions. A light emitting substrate is arranged below the marker member. A plurality of light emitting elements are mounted on the upper surfaces of the light emitting substrates.

The embodiment of the invention provides a crystal bar measurement device. The crystal bar measurement device comprises a support, a main column and at least two displacement sensors. A supporting piece used for supporting a crystal bar is arranged on the support; the main column can move relative to the support; the displacement sensors are fixed to the main column, and one of the displacement sensors is located on one side of the main column, and the other one of the displacement sensors is located on the other side of the main column, the displacement sensors which are located on the two sides of the main columns respectively carries out detection facing the crystal bar. By means of the measurement device, measurement values of the crystal bar at a plurality of measurement positions canbe obtained, the accuracy of the measurement values can be improved, therefore, the technical parameters of the next technical process are more precisely determined, and then the quality of the crystal bar is improved. Moreover, a non-contact measurement way is adopted by the measurement device, the physical damage to the surface of the crystal bar can be minimized.

An air flow rate measuring device is provided in which a pressure loss across a grid therein due to the load which is generated when a hose band is tightened is reduced and deterioration of its measurement accuracy due to the grid deformation is prevented. The grid is configured to have a grid portion which absorbs deformation at the outer periphery thereof, and another grid portion which does not absorb deformation at the inner periphery thereof. In order to make the grid portions independent of each other, the grid is provided with a frame, and the mesh grid inside of the frame which maintains a rectifying effect, prevents the deterioration of the measurement accuracy, and does not absorb deformation, and the grid outside of the frame absorbs deformation.

The invention discloses an immersed tube tunnel end steel shell mounting and measuring method, and relates to the technical field of immersed tube tunnels. The method comprises the following steps: S1, setting a plurality of measuring points; S2, arranging a measuring pile at each measuring point; S3, installing a total station on one measuring pile, and installing prisms on the other measuring piles; S4, measuring the prisms by using a total station; S5, repeating the steps S3 and S4, and measuring each measurement pile to form a measurement coordinate network; S6, setting a virtual coordinate system in the measurement coordinate network to obtain a coordinate value of each measuring pile; S7, according to the coordinate values of the measuring piles, obtaining actual coordinate values ofthe measuring piles through adjustment calculation software; S8, pasting a reflector on the surface of the end steel shell; S9, erecting a measuring instrument on the measuring piles to perform three-dimensional coordinate data acquisition on the reflection points on the end steel shell; and S10, comparing the acquired three-dimensional coordinate data with theoretical data to adjust the mountingposition of the whole end steel shell. The installation and measurement precision of the end steel shell is improved.

The invention discloses a differential pressure water level measuring system which comprises a pressure sensor and an air pipe. An end of the air pipe is connected with the pressure sensor, a plurality of temperature sensors are arranged on the inner side walls of the air pipe at preset intervals and are used for acquiring temperature values of corresponding locations where the various temperaturesensors are positioned in water, and transmitting temperature signals corresponding to the acquired temperature values to a central processing unit, and the various temperature signals and pressure signals acquired by the pressure sensor are computed by the central processing unit to obtain current water levels. The differential pressure water level measuring system has the obvious advantages that the temperature sensors are arranged in a water body at the preset intervals, accordingly, the temperatures of the different locations of the water body can be acquired and can be integrated with one another, the current water levels can be computed, the problem of low water level measurement precision due to the fact that only the temperature of a specific location in an existing water body isacquired can be solved, and the accuracy of water level measurement can be improved.

The invention relates to a portable device for generally surveying the eyesight of children. The device includes a display module for visualized operation and display of detection results, an image analyzing and processing module for analyzing and processing the obtained detection image and including a prime lens and an image sensor, an image obtaining module for system imaging and a light source module for providing a detection light source and a fixation light source for eyes of the child to be detected, which are sequentially installed in the same optical axis from left to right, wherein the light source module is composed of a light source main board and a light barrier which are coaxially assembled. According to the portable device for generally surveying the eyesight of the children, the light source module adopts a direct shooting manner, thus being simple in structure and easy to implement, and preventing the detection accuracy from descending by stray light; meanwhile the light source module adopts the manner of combining infrared light with visible light, the visible light is used for attracting the attention of the child to be detected, and the infrared light is used for detecting the eyesight; the portable device is designed aiming at the children with low cooperation capability or mentally deficient persons, and detection errors are reduced.

The invention discloses a measurement method of the corrosiveness of an electronic and electrical appliance service environment. The measurement method comprises the following steps: placing a copper test piece into the measured electronic and electrical appliance service environment, reducing a corrosive product film on the surface of the copper test piece through a cathode reducing method, then calculating the average thickness TCuO2 of a Cu2O corrosion product, the average thickness TCuO of a CuO corrosion product and the average thickness TCu2S of a Cu2S corrosion product, and finally calculating the total thickness average value Te, serving as a measurement result, of a surface corrosion product to acquire the corrosiveness of the measured electronic and electrical appliance service environment. Therefore, the measurement method can accurately measure the weak corrosiveness of the electronic and electrical appliance service environment under a condition of not affecting the electronic and electrical appliance service environment, so that the problem of low measurement precision caused by the adoption of a copper hanging piece weight loss method for calculating the corrosion rate in the prior art is solved.

The invention relates to a fully-automatic water pump state monitoring and fault diagnosis system. The fully-automatic water pump state monitoring and fault diagnosis system comprises a network signalreceiving module, which is connected with a vibration monitoring module, a displacement monitoring module, a swing monitoring module, a temperature monitoring module and a rotating speed monitoring module respectively, wherein filter circuits and main chips are arranged inside the monitoring modules; the monitoring modules are connected with a data output module respectively; an information processing module is arranged inside the data output module; a communication module is arranged inside the data output module; the data output module is connected with an information display module; the other interface of the data output module is connected with an Internet of Things module; the Internet of Things module is connected with a cloud server; and the cloud server is connected with mobile end equipment. Through the adoption of the fully-automatic water pump state monitoring and fault diagnosis system, high-accuracy multi-index real-time measurement can be performed; automatic acquisition, real-time transmission and processing of parameters are realized; a monitoring device is modularized; the measuring accuracy is improved; the monitoring efficiency is improved; monitoring errors arereduced; and meanwhile the monitoring cost is lowered.

To provide a clamp-on type ultrasonic flow sensor capable of preventing deterioration in measurement accuracy of a flow rate due to deformation of a pipe. Elastic couplants CP1 and CP2 formed to surround the outer circumferential surface of a pipe are fixed while being pressed on the pipe P by fixing inner surfaces FS of two clamp members 131 and 132. An ultrasonic wave is propagated through the elastic couplants CP1 and CP2 and fluid in the pipe between a first ultrasonic element 101 and a second ultrasonic element 102. A cross section of the fixing inner surfaces FS of the clamp members 131 and 132 has a shape of a regular even-numbered polygonal shape centering on the axis of the pipe.

The invention discloses a precise composite measuring tool, a sand core positioning method and application thereof. The precise composite measuring tool is used for being arranged on a casting box tomeasure and position a sand core on the casting box and includes a mounting plate which is supported on the casting box and detachably connected with the casting box; the mounting plate is provided with a first measuring piece for measuring the central position, angular position and height of the sand core assembled on the casting box and a second measuring piece for finding the locations of positioning holes of the sand core and conducting measuring location positioning on the sand core. The precise composite measuring tool is simple in structure and easy to clamp and disassemble. The first measuring piece achieves installation positioning of the complex sand core by adjusting the precision of the central position, angular position and height; by positioning the locations of the positioning holes of the sand core, the second measuring piece effectively prevents the situation that the measurement accuracy is low since complex parts of the sand core are blocked. Thus, the precision of the casting shape and the quality of a casting are ensured.

The invention relates to a measuring and calculating method for a large-size precise component, and belongs to the technical field of contour measurement. The method comprises the following steps: arranging a laser tracker and a first target ball, establishing a measurement coordinate system, and realizing station transfer from the measurement coordinate system to a global coordinate system by using the target ball; the original point of each measurement coordinate system is optimized; arranging a scanner and a second target ball, and respectively establishing coordinate systems; calculating a conversion matrix of a scanner coordinate system and a target ball coordinate system by using the first target ball; then removing the first target ball and arranging the precision component, and simulating the precision component; selecting feature points on the simulation precision component to calculate a scanning path; finally, a trolley is used for carrying a scanner to scan along the path to obtain global coordinate point clouds of the component, the point clouds are spliced to restore the component, and the size is measured and calculated. According to the method, the defect that a traditional tracking type three-dimensional scanning measurement and calculation technology is large in error is overcome, the pose of the mechanical arm is inversely solved through the calculation path, and the accuracy is improved while automatic measurement and calculation are achieved.

The invention belongs to the technical field of hypersonic ground tests, and aims to provide a high-pressure gas flow control device for a wind tunnel test in order to solve the technical problem of low measurement precision in the prior art, and the high-pressure gas flow control device sequentially comprises a rear transition section, a nozzle switching section, a steady flow cavity and a front transition section, the front end of the rear transition section is connected with a downstream pressure pipeline, the sonic nozzle is installed on the nozzle switching section, the sealing gaskets are arranged at the front end and the rear end of the sonic nozzle respectively, the sonic nozzle and the rear transition section are clamped through the nut pressing cap, and the nozzle switching section, the flow stabilizing cavity and the front transition section are sequentially connected. The measurement precision and accuracy are improved, and the application range is wide; and unnecessary error data caused by non-concentricity of the sonic nozzle and the steady flow cavity during installation is avoided. The installation precision of the flowmeter is improved; and the device is simple in structure, good in repeatability, small in flow pressure loss and easy to replace, and widens the measurement range.

The invention relates to the technical field of curved surface measurement, and discloses a curved surface morphology acquisition and measurement system. The system comprises a base, a lifting drivingdevice, a steering seat, a telescopic mechanical arm, a measurement sensor and a measurement terminal; the lifting driving device is mounted on the base; the lifting driving device is connected withthe steering seat and drives the steering seat to lift; one end of the telescopic mechanical arm is connected with the steering seat; the measurement sensor is installed at the other end of the telescopic mechanical arm; and the lifting driving device, the steering seat, the telescopic mechanical arm and the measurement sensor are electrically connected with the measurement terminal. The curved surface morphology acquisition and measurement system provided by the invention has the technical effects of high measurement precision and low artificial participation degree.

An image forming apparatus includes a plurality of white reference plates, a plurality of measurement units configured to be arranged in positions opposed to the respective plurality of white reference plates, irradiate the white reference plates with light, and measure reflected light from the white reference plates, and a determination unit configured to determine an abnormality of the plurality of white reference plates by using respective measurement results measured by the plurality of measurement units.

The invention provides a method for cutting and positioning a brazing filler metal foil strip by adopting a vacuum brazing process, which comprises the following steps of: 1, performing image recognition on a core body of a dot matrix sandwich structure to generate a two-dimensional image of the surface profile of the core body, including image acquisition, rapid image processing and profile recognition; 2, core contour parameters generated in the step 1 are guided into a control system, precise and lossless cutting is conducted on the brazing filler metal foil belt through the ultrafast laser machining technology, and the situation that the microstructure of the brazing filler metal belt is affected by excessive heat input is avoided; step 3, paving a plurality of layers of amorphous brazing filler metal strips prepared in the step 2 according to process requirements to form a complex variable-thickness brazing filler metal foil strip; the complex variable-thickness brazing filler metal foil belt is connected with the dot matrix sandwich structure panel through the micro-resistance spot welding technology, and precise positioning of the brazing filler metal foil belt is achieved. By precisely cutting and positioning the brazing filler metal foil strip, the weight increment of the brazing filler metal is reduced while the welding quality is guaranteed, and the lightweight requirement is met.

The invention discloses a vision-based method for measuring the cutting width of an intelligent rice and wheat harvester. The obtained original rice and wheat image is transformed into a top view; the actual target distance from the harvest boundary line to the crop divider is obtained, and the pixel width of the target area in the top view is obtained by combining the reduction factor and the image of the target area is determined; image preprocessing operations; The harvesting boundary line of the harvested rice and wheat and the unharvested rice and wheat is extracted, and the binarized image of the target area including the harvesting boundary line is obtained; the probabilistic HOUGH transformation method is used to detect the harvesting boundary line in the image and obtain the coordinate parameters. The pixel distance of the harvesting boundary line, and the actual cutting width of the harvester is calculated. The invention improves reliability, and can perform high-precision measurement of the cutting width of the intelligent rice and wheat harvester in real time and safely.