51results about How to "Accurate magnification" patented technology

The invention discloses a method for rapidly detecting ferromagnetic grain content in lubricating oil and a detection device thereof as well as a signal processing circuit. A transformer type electromagnetic sensor is adopted, and variation of related parameters of the electromagnetic sensor which is caused by variation of field distribution due to ferromagnetic grain in lubricating oil is detected, so as to detect ferromagnetic substance content in lubricating oil. Influence of nonferromagnetic pollutant can be naturally eliminated, higher linearity can be realized, meanwhile cost is low, and real time property is good.

The invention discloses a one-freedom-degree flexible micro-positioning platform. The one-freedom-degree flexible micro-positioning platform comprises a motion input device, a flexible motion platform and a platform base used for fixing the flexible motion platform; and the flexible motion platform comprises two half motion mechanisms, and each half motion mechanism comprises a motion platform connected through flexible hinges and multi-stage differential motion levers. According to the design, displacement is amplified and can be accurately amplified on the conditions that the positions and the sizes of the flexible hinges and the levers are accurate; the design structure is simple, the occupied space is relatively small, displacement can be output stably through the symmetric structure, lateral additional displacement can be effectively removed, longitudinal coupling displacement errors of the platform can be reduced, the displacement amplification accuracy is improved, and the flexible hinges can be integrally machined easily due to the design, and assembly errors can be avoided. Displacement amplification is accurately realized in relatively-small space and at low cost, and the problem that large stroke and high accuracy of the flexible micro-positioning platform cannot be balanced is solved.

The invention discloses a mutual coupling compensation analysis method for a microstrip array antenna. The method comprises the following steps of: modeling an array antenna structure, and performing delaunay triangulation on the structure by using the delaunay of a MATLAB function to divide the surface of a metal to be researched into a series of triangles, wherein each pair of triangles with common sides forms corresponding Rao-Wilton-Glisson (RWG) side elements; and replacing the surface current distribution of the RWG side elements of two triangles by using an infinitesimal dipole with an equivalent dipole moment or strength by adopting a dipole modeling method, and determining the electromagnetic radiation characteristics of a free space for surface current. A mutual impedance array, solved by adopting a moment method, of the microstrip array antenna takes the effect of mutual coupling between adjacent radiation elements into account. Therefore, a mutual coupling weight vector of an array unit is corrected during weight vector calculation mutual coupling effect correction to further optimize the output direction characteristics of an array.

An electron beam exposure apparatus for exposing wafer with an electron beam, includes: a first electromagnetic lens system for making the electron beam incident substantially perpendicularly on a first plane be incident on a second plane substantially perpendicularly; a second electromagnetic lens system for making the electron beam that was substantially perpendicularly incident on the second plane be incident on the wafer substantially perpendicularly; a rotation correction lens provided within the first electromagnetic lens system for correcting rotation of the electron beam caused by at least the first electromagnetic lens system; a deflection system for deflecting the electron beam to a position on the wafer; and a deflection-correction optical system provided within the second electromagnetic lens system for correcting deflection aberration caused by the deflection system.

The invention discloses a power-off maintaining three-degree-of-freedom piezoelectric directional adjustment device and platform control method, and relates to a piezoelectric driving adjustment device and method. The device comprises a platform, a base and three or four adjustment mechanisms, wherein each adjustment mechanism comprises an ejector rod, a driving mechanism, a braking mechanism and a supporting body; the upper end of the ejector rod is fixed to the platform, a universal flexible hinge is machined on the ejector rod and located between the upper portion of the supporting body and the platform, and the supporting body is fixed to the base. The method comprises the steps: 1, assembling the adjusting mechanism, the platform and the base; 2, relieving the self-locking state of the ejector rod; 3, enabling the adjustment device to control the platform to achieve three-degree-of-freedom adjustment. The device is compact in structure, is used in a space environment, is stable and reliable in operation, can realize three-degree-of-freedom adjustment of the platform, and can meet the application requirements of the space environment.

The invention belongs to the civil engineering monitoring equipment field and particularly relates to a field visualization type strain sensor, which comprises an elastic element, a strain gauge, a circuit board and a field early-warning device. The elastic element is fixed in a measured structure. The strain gauge is arranged on the surface of the elastic element. The strain gauge is connected with the circuit board. The deformation of the strain gauge is converted into an electrical signal and the electrical signal is transmitted to the circuit board. The circuit board is also connected with the field early-warning device. The circuit board includes a balanced bridge, a precise amplifier circuit, a signal processing module, an STM 32 single-chip microcomputer and a data transmission module. The invention also discloses an early-warning method based on the above strain sensor. According to the technical scheme of the invention, an alarm lamp is integrated with the sensor itself, and different colors of the alarm lamp correspond to different degrees of the structural deformation. Therefore, the engineering safety state is displayed in real time. The invention provides a real-time, in-situ and easily-understood engineering monitoring and early warning manner, wherein the field early-warning function and the remote control function are simultaneously realized. The early-warning effect is better.

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 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.

The invention discloses a correction device and a correction method for a 1X optical sight with an image display function. The correction device comprises an optical bench, a graduation component, a collimator objective, an optical sight mounting rack, a rotary encoder and a theodolite. The graduation component, the collimator objective, the optical sight mounting rack and the theodolite are sequentially arranged on the optical bench in the direction of a straight line, and the rotary encoder is connected with a movement component of the optical sight. Compared with the prior art, the correction device and the correction method have the advantages that the calibration environment is designed relatively simply, the multiplying power is relatively accurate, a product does not need to be disassembled during calibration, calibration can be realized only through the rotary encoder on the optical sight, and thus the leakproofness of the product and the consistency of product adjustment are guaranteed.

The invention discloses a programmable time amplifier circuit with high precision and a high dynamic range. The programmable time amplifier circuit comprises a phase detection circuit, a time preprocessing circuit, a rail-to-rail voltage comparator, a 3-8 decoder and a current biasing circuit. The phase detection circuit extracts a time interval of a step input signal and generates a pulse signal DN; the time preprocessing circuit controls the current source to charge and discharge the capacitor according to the pulse signal DN to generate two groups of ramp signals; the rail-to-rail voltage comparator realizes comparison in a full voltage range according to the two groups of input ramp signals; the 3-8 decoder provides a control signal for a capacitance control switch of the time preprocessing circuit; and the current bias circuit provides reference current bias for the time preprocessing circuit and the rail-to-rail voltage comparator. According to the invention, the input time interval can be accurately amplified, the time interval amplification of a high input range can be satisfied, the amplification factor programmable function can be realized, and the resolution and quantization input range of the assembly line TDC can be effectively improved.

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.

A method for correcting magnification in a photographic device is disclosed in this present invention. The point of this invention is that the magnification ratio of a photographic device is saved into a nonvolatile memory and read out for correcting the magnification in the photographic device, so that the image with correct dimension can be output from the photographic device. Therefore, this invention can provide a more efficient method for correcting magnification in a photographic device, and the quality of the image captured by the photographic device can be improved thereby.

A method for choosing zoom-out range features that a box is inserted in a picture displayed on display screen and them moved to any position on the picture, and the contents in the box can be zoomed out by the proportion setting. Said methods can be used for drafting computer.

A method and system are provided for obtaining a true shape of objects in a medical image. The method includes receiving X-ray stand geometry parameter values, an Angle_point, and an Angle_stand values; selecting a plurality of pixels representing an object in the X-ray image; and determining magnification of each pixel in the X-ray image, that enables accurate determination of size and shape of imaged objects. The method may include determining an actual size of the object in the X-ray image and selectively reshaping the object in the X-ray image to obtain a true shape of the object.

The embodiment of the invention provides an interference signal processing method and device and a GSM mobile terminal, and relates to the technical field of data processing. The method is applied toa processor of the GSM mobile terminal, and the GSM mobile terminal comprises a power amplifier, an antenna switch module and a transceiver; the power amplifier is electrically connected with the transceiver and the antenna switch module, and the transceiver is electrically connected with the processor. The method comprises the following steps: sending a control signal to the power amplifier through the transceiver; when the communication signal sent by the transceiver is not synchronous with the working actions of the transceiver, the power amplifier and the antenna switch module, the sendingtime of the control signal is adjusted, so as to adjust the time interval of the working action of the transceiver, the working action of the power amplifier and the working action of the antenna switch module so that the power amplifier amplifies the communication signal according to the adjusted control signal and sends the processed communication signal through the antenna switch module, and the problem of clock signal leakage can be solved.

The invention discloses a variable gain amplification circuit for pressure-sensitive touch. The circuit comprises an operational amplification module, a gain configuration module and a clock control module; the clock control module is used for generating a control clock; the gain configuration module is used for configuring gain and output bias voltage according to the control signal, so that an input signal is amplified through reverse operation, superposed with fixed bias voltage and then output; according to the invention, the gain of the amplification circuit is adjusted by adjusting the capacitance value ratio of the input end of an operational amplifier to a feedback branch; the fixed bias amount of the output voltage is changed by adjusting the capacitance value ratio of the input of the operational amplifier to a reference voltage branch; the output signal is only related to the reference voltage, the gain and the input, accurate amplification is obtained when the voltage of the input signal is close to zero, and the problem in amplification when the input signal is close to zero (ground) during light touch in a pressure-resistance change-voltage sensing-based touch schemeis solved.

The invention discloses a method for calibrating a strain multiplier. The method comprises the following steps of: a, mounting the strain multiplier on a test piece; b, loading force to the test piece, so that the test piece strains; c, acquiring a strain value epsilon b of the strain multiplier and a strain value epsilon s of the test piece; and d, determining an amplification 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 first strain piece is arranged on the test piece; and in the step c, the strain value epsilon s of the test piece is acquired by measuring a strain value of the first strain piece. Due to the technical scheme, because the strain value epsilon s of the test piece is obtained by directly measuring the strain value of the first strain piece which is arranged on the test piece, deviation is hardly present, and the obtained amplification factor of the strain multiplier is accurate; therefore, a using effect of the strain multiplier is improved.