51results about How to "Accurate magnification" patented technology

The invention discloses a calibrating method of a strain multiplier, which comprises the following steps of: a: mounting the strain multiplier on a test piece; b: applying a force to the test piece so that the test piece generates a strain; c: obtaining a strain value ([epsilon]b) of the strain multiplier and a strain value ([epsilon]s) of the test piece; and d: determining a multiplying factor of the strain multiplier according to the strain value ([epsilon]b) of the strain multiplier and the strain value ([epsilon]s) of the test piece, wherein in the step a, a second strain disc is mounted on the strain multiplier; and in the step c, a strain value ([epsilon]b) of the strain multiplier is obtained through measuring a strain value of the second strain disc. According to the technical scheme, the method can accurately obtain the strain value ([epsilon]b) of the strain multiplier, and the obtained multiplying factor of the strain multiplier is accurate, thus the use effect of the strain multiplier is improved.

A current mirror circuit that amplifies a reference current generated by a current source at a first magnification to supply a mirror current to a load circuit. The current mirror circuit includes a first transistor and a second transistor that share a power supply, and a drain potential mirror unit that amplifies the reference current at a second magnification to generate a first current, that amplifies a generated first current at a third magnification to generate a second current, and that supplies a predetermined potential determined based on the second current to a drain of the second transistor. The mirror current is supplied from the second transistor to the load circuit based on a potential of a gate of the first transistor determined based on the reference current.

The invention discloses a correcting device and method for X-ray image digital measurement. The correcting device comprises a base, a longitudinal supporting rod, a transverse supporting rod, a straight edge and two metal balls, wherein the longitudinal supporting rod is fixed on the base; the longitudinal supporting rod and the transverse supporting rod are connected and can slide mutually, and the transverse supporting rod can rotate in the horizontal plane and the vertical plane; the straight edge is connected with one end of the transverse supporting rod, and the straight edge can rotate in the horizontal plane and the vertical plane; the two metal balls are respectively arranged at one end of the straight edge, and the centers of the two metal balls coincide with the calibration starting point and the calibration ending point of the straight edge respectively; the straight edge is made of plastic and is provided with metal calibrations. According to the correcting device for the X-ray image digital measurement, a reference substance of the balls is provided, so that the measurement errors caused by different irradiation directions due to non-sphere shape characteristics are eliminated, the computation of magnification can be more simplified, and more accurate magnification can be obtained. According to the correcting device and method for the X-ray image digital measurement, the femoral head and femoral neck can be conveniently and accurately measured.

The invention discloses a microcontroller for field orientation control of a motor. The microcontroller comprises a processor, a memory cell, a clock generation unit, a mathematic coprocessor, a programmable analogue amplifier unit, an analog-to-digital converter and a bus unit, wherein the processor, the memory cell, the clock generation unit, the mathematic coprocessor, the programmable analogue amplifier unit, and the analog-to-digital converter are connected through the bus unit.

The invention discloses a power channel inspection method based on a fuzzy path, which comprises the following steps: Step 1: Obtain the fuzzy path information required for the power channel inspection from a map; Step 2: Send the path information to no one in a wireless manner machine; Step 3: The UAV flies to the vicinity of the first inspection point in the path, recognizes the target based on machine vision, and judges the position and height of the UAV itself according to the parameter characteristics of the target; Step 4: None After the man-machine reaches the designated position and height, adjust the proportion of the target in the screen through the focal length adjustment algorithm and take pictures and identify defects; Step 5: Repeat Step 3 and Step 4 until the inspection operation of all path points is completed; Step 6: The UAV returns and lands. The inspection method simply selects key path points on the map to form a fuzzy path information, eliminating the need for manual collection of path information or 3D point cloud data to set path information, saving manpower and material resources and improving efficiency.

A three-degree-of-freedom piezoelectric pointing adjustment device and platform control method for power-off maintenance, a piezoelectric drive adjustment device and method, the device includes a platform, a base, and three or four adjustment mechanisms; each adjustment mechanism includes a push rod , driving mechanism, braking mechanism and support body; the upper end of the ejector rod is fixed on the platform, and a universal flexible hinge is processed on the ejector rod, the universal flexible hinge is located between the upper part of the support body and the platform, and the support body is fixed on the base The steps of the method include: 1. assembling the adjustment mechanism, the platform and the base; 2. releasing the self-locking state of the ejector rod; The device of the invention has a compact structure, is used in a space environment, and operates stably and reliably. The platform can realize adjustment of three degrees of freedom, and can meet the application requirements of the space environment.