59results about How to "Avoid low measurement accuracy" patented technology

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.

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.

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 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 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.