59results 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.

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.

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.

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 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.

The invention discloses an automatic horizontal defoaming standard metal measuring vessel. The automatic horizontal defoaming standard metal measuring vessel comprises a meter supporting seat, a rotating frame is arranged in an upper portion of the meter supporting seat, a meter is arranged in an upper part of the rotating frame, an oil discharge port is formed below the meter; a flip cover is arranged above the meter; a support frame is arranged below the meter support seat; a defoaming plate is arranged in the meter, an auxiliary defoaming plate is arranged above the defoaming plate, a liquid level meter is arranged on a neck portion of the meter, a gradienter is arranged at one end of the liquid level meter, and a thermometer is vertically arranged in the meter. The automatic horizontaldefoaming standard metal measuring vessel is ingenious and simple in structure and is convenient to use, the oil temperature, the oil quantity and the horizontal degree in the metering device can berapidly and accurately measured, the accuracy of oil quantity measurement is less affected by the environment, foam generated when an oil medium is injected can be rapidly eliminated, the measurementaccuracy is greatly improved, a measurement site does not need to be manually cleaned, and the waste of manpower, material resources and time is reduced.

The invention relates to the technical field of ranging, and discloses a ranging method and a ranging device, which comprises the following steps of: calculating the angle Alpha1 between the line A1Band the line BC by detecting a first state angle and a second state angle when the terminal is at the first position B, calculating the angle theta1 between the line A1C and the line BC by detecting athird state angle and a fourth state angle when the terminal is in the second position C, obtaining a distance x from the first position B to the second position C, finally, the distance LA1B betweenthe point to be measured at the position A1 and the first position B is calculated by alpha1, theta1 and x so as to avoid the problem of low measurement accuracy caused by calculating the distance ofthe object to be measured by the image distance, thereby improving the accuracy of the measurement distance of the terminal.