38results about How to "Avoid quadratic errors" patented technology

The invention relates to a processing technology of a silicon slice for manufacturing of an integrated circuit, in particular to a method for doubly setting and accurately positioning the centre of the silicon slice. The method comprises the following steps of: rotating the silicon slice along centre direction; identifying edges of the silicon slice sequentially by linear image identification sensors having different precisions; determining positions of a flat edge or a notch; determining the offset of the centre of the silicon slice; and moving the silicon slice by using a bidirectional movement motor to make the centre of the silicon slice overlapped with a designed position. Therefore, a transmission error of the silicon slice existing in processing equipment in the process of semiconductor industry is avoided, and the precision of the set centre of the silicon slice is equal to 1 mu m by using the double-setting method.

The invention discloses a multivariate geochemical anomaly recognition method based on graph attention self-encoding, comprising the following steps: determination of composition threshold K; construction of topological network of geochemical elements; learning of multivariate geochemical features; background reconstruction of multivariate geochemical elements; value calculation. The present invention introduces graph learning into geochemical anomaly detection, uses K nearest neighbors to construct a topological relationship graph of geochemical elements, and constructs and trains a graph attention self-encoder capable of simultaneously extracting element composition relationships and spatial structure features. Based on the trained graph attention self-encoder, the multivariate geochemical background is reconstructed, and the final outlier value of each sampling point is calculated. The present invention expands the existing neural network model, so that the model can directly process sampling point data and be applied to irregular areas, greatly improves the learning performance of the background of chemical exploration and the practicability of the model, and provides a practical solution for complex geological conditions. Reliable method for identifying anomalies in geochemical exploration.

The invention discloses a multi-mirror laser precision splicing calibration method, which is specifically implemented according to the following steps: Step 1, building a multi-mirror laser precision splicing calibration table; Step 2, making a standard calibration plate and adjusting the standard calibration plate; Step 3, Scan the galvanometer to eliminate the standard deviation; step 4, extract the point deviation of the galvanometer, and generate the standard deviation matrix table of the equipment to complete the splicing correction of the multi-galvanometer precision. The invention solves the problems in the prior art that it is difficult to get in place at one time during the precision correction process of multi-vibrating mirror equipment, takes a long time and has poor splicing precision.

The invention relates to a curved pipe shape detection system and a detection method. The curved vascular detection system comprises a numerical control pipe-bending machine, a pipe shape detection apparatus and a control system used for processing the detection information, the pipe shape detection apparatus used for measuring the rebound distance of the pipe is arranged on the numerical control pipe-bending machine, and is positioned at same plane with a processing pipe fitting of the numerical control pipe-bending machine; the pipe shape detection apparatus is connected to the control system, and a rebound angle of the pipe fitting can be calculated by using a geometry principle. According to the invention, the rebound distance of the pipe fitting can be measured according to the distance change between the pipe shape detection apparatus and the pipe fitting before and after rebound, so that a rebound value of the pipe fitting can be rapidly calculated. In the invention, the curved pipe shape detection system enables on-line direct detection on the numerical control pipe-bending machine, secondary error due to multitime clamping can be avoided, the detection system and detection method are convenient and fast, and the detection system is suitable for batch detection, error overlaying between multiple bends of the pipe fittings can be avoided, and detection precision can be enhanced.

The invention relates to a universal AC measurement method for the external quantum efficiency of a solar battery, which comprises that: an optical part consisting of a xenon light source, a focusing lens and a monochromator supplies monochromatic light; an offset light source provides a working environment for the solar battery; an optical chopper and a phase-locked amplifier use phase-locked technology to measure voltage drops at both ends of a sample resistance; a monochromatic light power meter detects a power of incident monochromatic light; a microcomputer performs instrument control and data processing; and finally, a single-wavelength external quantum efficiency curve of the solar battery is obtained. The invention focuses on the AC measurement method, and the AC measurement method has universality and can be used for various types of solar batteries. The invention also relates to an optoelectronic integrated system, which has the advantages of rapidness and accuracy, reduces the cost of solar battery parameter measurement equipment, improves signal intensity and accuracy, provides more comprehensive battery parameter information, and is used for guiding the improvement onpreparation process and performing research on the mechanism of partly batteries.

The invention provides a device for measuring the sound absorption coefficient of an acoustic material by use of a pulse method and a measuring method. The device comprises a sound tube, a pulse sound source, a microphone, a power amplifier, a signal conditioner, an adapter and a data acquisition device, wherein the sound tube is formed by coaxially and fixedly connecting a large-diameter cylindrical tube, a conical tube and a small-diameter cylindrical tube in sequence; two through holes vertical to the central axis of the small-diameter cylindrical tube and used for mounting the microphone are formed on the side wall of the small-diameter cylindrical tube; the pulse sound source is mounted in the large-diameter cylindrical tube; and the outer end of the small-diameter cylindrical tube is in threaded connection with a rear cover. The measuring method comprises the following steps of: obtaining a frequency response function of the whole measuring system; obtaining an excitation signal spectrum of the required pulse sound source; and exciting the pulse sound source by use of the excitation signal of the required pulse sound source and measuring to obtain the sound absorption coefficient of a to-be-measured sample. The device and method provided by the invention avoid secondary error caused by decomposing a sound field in a frequency domain in the traditional method, and also overcome the problem of phase matching in the traditional multi-microphone method.

The invention belongs to the technical field of connection and fastening, and relates to an intelligent wrench control system. The intelligent wrench control system comprises a power source, a torquecontroller, a power wrench and a torque measurement feedback sleeve, wherein the power source is connected with the power wrench through the torque controller, the power wrench rotates a target fastener by sleeving the torque measurement feedback sleeve, the torque controller is connected with the torque measurement feedback sleeve in wireless mode, the torque measurement feedback sleeve is used for collecting real-time torque data, and feeds the collected torque data back to the torque controller, and the torque controller controls intensity and blocking and unblocking of power output from the power source to the power wrench. The intelligent wrench control system performs accurate fastening work by presetting torque value of the target fastener, improves accuracy and efficiency of the fastening work, and is easy and convenient to operate, and accurate and rapid in target torque fastening work.

The invention provides an installation method of complicated group anchors, which is used for fixing anchor plates to the surface of a substrate material. The method comprises the following steps: step A, leveling a base layer to make the surface smoothness deviation to be less than or equal to + / -1mm; step B, determining drawing positions of a plurality of anchor bolts on the surface of the substrate material according to a design drawing; step C, probing steel bars in the drawing position of each anchor bolt to determine the actual position of the anchor bolt; step D, drilling holes in the actual positions of each anchor bolt on the substrate material, controlling the hole drilling depth with the depth deviation between 0 and 2 mm, and placing the anchor bolts into the holes; step E, pasting PVC plates with the same size as the anchor plates to the anchor bolts, and marking the position of the center point of each anchor bolt on the surface of each PVC plate; step F, drilling holes on the anchor plates according to the actual position distribution maps of the anchor bolts on transfer plates; and step G, installing the anchor bolts, then, pasting the anchor plates to the surface of the substrate material so the end of each anchor bolt passes through the corresponding hole formed on the anchor plates, and installing screw nuts of each anchor bolt.