37results about How to "Reduce the introduction of error" patented technology

This invention relates to a method for processing second-order blind holes of high density interlinked CB including the following steps: providing a CB with a circuit on one side, forming a first back-glued copper foil on the surface of the circuit, forming multiple first copper windows in the copper foil layer, forming a second back-glue copper foil on the surface of the first copper foil with the first copper windows, utilizing a laser to open multiple second copper windows corresponding to the first ones in the layer of the second copper foil, utilizing a second laser to eliminate the subs of the two copper foils from the second copper windows so as to form multiple second-order blind holes.

The invention discloses a measurement method for a differential antenna, wherein use of a Balun is reduced to the greatest extent, a comprehensive measurement is carried out on Balun characteristics in the case that the Balun needs to be used, and a measurement error introduced by the Balun is eliminated in the subsequent data processing, thus the measurement is more accurate; the measurement method is higher in accuracy compared with the traditional measurement method, low in introduction error, and capable of being widely applied to a measurement for the differential antenna; a matching load is reasonably used during the measurement process, thus the adverse effect of a suspended antenna arm on the characteristics of the antenna during the single-end measurement for the differential antenna is reduced, and the impedance characteristic and the radiation characteristic of the antenna are really reflected in a manner of power synthesis; the measurement for the differential antenna by virtue of a coaxial cable is realized. The measurement method adequately considers the application environment of the antenna, all the measurements simulate the real environment of the antenna, and the obtained measurement result is capable of keeping consistent with the characteristics during the applications of the antenna.

The invention provides a system and method for detecting a voltage standing wave ratio at an output terminal. A system for detecting a voltage standing wave ratio of an output terminal includes a vector network analyzer configured to provide an excitation signal to an input terminal of a component to be tested so as to enable that component to be tested to be in an operating state, providing a test signal to an output terminal of the part under test so that the test signal is reflected by the output terminal of the part under test to generate a reflected signal; and receiving the reflected signal and the test signal to obtain an output voltage standing wave ratio of the part under test according to the reflected signal and the test signal. The invention simultaneously provides an excitation signal and a reflection signal for the part to be tested by a vector network analyzer to detect the voltage standing wave ratio of the output terminal of the part to be tested, so that the accuracyof the voltage standing wave ratio detection of the output terminal of the part to be tested under the working state can be improved.

The invention discloses a three-dimensional acquisition and reconstruction system based on a mobile sparse camera acquisition array. Through the simultaneous movement of a plurality of camera acquisition units (at most 8 camera acquisition units) arranged at random within a certain range, collection of three dimensional surface information is performed on a collected object, and each pixel point in all collected images is compared, and depth information of the collected object is obtained through an optimization algorithm, therefore, a three-dimensional coordinate of the pixel point can be calculated, and finally, a digital model which satisfies a real physical size of the collected object can be obtained. The three-dimensional acquisition and reconstruction system based on the mobile sparse camera acquisition array provided by the invention not only simplifies the whole system, but also reduces a link of introducing an error when calculating internal and external parameters in an acquisition process.

The invention relates to a method for measuring substance dielectric constant by using a monopole antenna. Transmitting characteristics of the monopole antenna are used for measuring the frequency of microwave when the transmit power of the microwave is maximal in a substance to be measured. Therefore, the dielectric constant of the substance to be measured is obtained. When part length of the monopole antenna has a certain relationship with the wavelength of transmitted electromagnetic waves in the substance to be measured, the transmitting power of the antenna reaches the maximum. The monopole antenna method just uses such relationship to measure the dielectric constant. The method can measure the dielectric constant of the substance more simply and accurately.

The invention discloses a road edge identification method and device based on laser point cloud. The method comprises the following steps: extracting a corresponding road edge point from each scanningline in a laser point cloud; and generating an effective road edge line according to the extracted road edge points. The road edge line can be accurately identified, and the method is suitable for road edge manufactured with any building material, road edge of any shape, horizontal roads, inclined roads and the like; and the calculation amount is small, and the method is suitable for large-scalehigh-precision data acquisition operation.

The invention relates to a digital manometer for accurately measuring pressure to be measured, comprising a MCU (Microprogrammed Control Unit) and a pressure sensor. The pressure sensor is connected with a signal conditioning circuit, the signal conditioning circuit is connected to an analog-to-digital converter, and the analog-to-digital converter is connected to the MCU which is also connected to an EPROM (Electrically Programmable Read-Only Memory), a power supply of 3V and a monitor. By adopting the MCU for low-voltage power supply, the oscillator frequency of the MCU is decreased, the system power supply is automatically switched off to decrease power consumption when no measurement is carried out; a high-linearity 14-bit analog-to-digital converter is adopted to add a temperature comprehension circuit to a pressure transmitter and reduce environmental introduce errors; and errors nonlinearly introduced by the pressure sensor are corrected through the technologies of zero point correction and multi-point correction when data is processed and measured so as to prolong service life to the maximum extend.

The invention provides a one-dimensional PSD sensor assembly applicable to on-orbit deformation measurement of a satellite structure. The one-dimensional PSD sensor assembly comprises a casing and a PSD signal processing board arranged in the casing, wherein a PSD signal processing circuit is arranged on the PSD signal processing board and comprises a one-dimensional PSD chip, a current sampling circuit, a voltage amplifying circuit, an output protecting circuit, a precision power supply circuit, a heating circuit and a temperature measuring circuit; the one-dimensional PSD chip is used for sensing the position of an incidence laser point; the current sampling circuit and the precision power supply circuit are connected with the one-dimensional PSD chip; the voltage amplifying circuit andthe current sampling circuit are connected with the output protecting circuit; the heating circuit is connected with an external power supply; the temperature measuring circuit is connected with an external temperature acquiring single machine. The one-dimensional PSD sensor assembly can be used for realizing non-contact measurement of on-orbit deformation of the satellite structure, and has an own temperature measuring function and an autonomous thermal control function in a low-temperature environment.

The invention relates to a gain calibration method and device, computer equipment and a storage medium, and the method comprises the steps: enabling calibration equipment to control a frequency sourcein to-be-tested equipment to output a first dot frequency signal with preset power according to a working frequency band of a to-be-tested channel in the to-be-tested equipment, then, detecting an output power value of a second dot frequency signal power detection equipment, wherein the second dot frequency signal is obtained by converting the first dot frequency signal by the to-be-detected channel, and finally, adjusting the gain calibration adjustment value of the to-be-measured channel according to the output power until the output power value is within a preset power range. By adopting the method, the calibration accuracy can be improved.

The invention discloses a system for measuring the inner diameter of a rotator workpiece. The system comprises a supporting assembly and a measuring assembly arranged on the supporting assembly. The base, the supporting part and the mounting part which are fixedly connected in sequence from bottom to top are used for forming the supporting frame, and parts for measurement are mounted; a rotary workbench is arranged on the base, and the rotator workpiece is fixed through a fixing part on the rotator workbench; a rotation angle grating is arranged in a rotary workbench to measure the rotation angle of the measured rotator workpiece; a Z-direction main shaft is arranged on a guide rail of a mounting part and forms two-axis measurement with a rotating shaft of the rotary workbench; a camera isarranged on the mounting part to detect whether a workpiece is placed on the rotary workbench or not; a displacement grating is arranged on the mounting part to measure the movement displacement of the Z-direction main shaft; a pneumatic displacement sensor is arranged at the bottom end of the Z-direction main shaft, high-pressure gas is injected into an air bag of the Z-direction main shaft, a probe is blown out, and the relative distance to a measured surface of the inner wall of the workpiece is measured; two-axis measurement of the inner diameter of the revolving body workpiece is realized.

The invention discloses a transition waveguide used for realizing connection between a standard waveguide and a non-standard waveguide without a flange. The transition waveguide adopts a step structure. A first step can be inserted into the non-standard waveguide and makes tight contact with an inner surface of the non-standard waveguide. A cross section size of a second step is the same with a cross section size of the non-standard waveguide. A size of a last step is the same with a size of the standard waveguide and the last step is equipped with a standard flange plate. The invention also discloses a cold test assembly which comprises the transition waveguide and is used for a lower-hybrid wave antenna of a Tokamak device. The transition waveguide of the invention adopts a structure which is symmetrical to a structure of the non-standard waveguide, a microwave transmitted from the non-standard waveguide is restored in the second step and a tool introduction error of a whole test assembly including the transition waveguide can be effectively reduced. Simultaneously, design time and difficulties of the transition waveguide adopting the structure in the invention and the antenna cold test assembly are greatly shortened and reduced.

The invention discloses a multifunctional same-material three-electrode probe. The multifunctional same-material three-electrode probe is characterized by comprising a probe frame, a research electrode, an auxiliary electrode, a reference electrode, first connectors, electric connection components, seal end heads and second connectors; the middle of the probe frame is provided with three stepped through holes which are formed uniformly; the research electrode, the auxiliary electrode and the reference electrode are respectively arranged at the three stepped through holes of the probe frame, and are fixedly connected to the bottom surface of the probe frame through the first connectors; the first connectors have conductivity; the electric connection components are respectively arranged in the three stepped through holes, are in contact with the first connectors, and are connected with the probe frame in a sealed mode; the seal end heads are respectively connectd with the research electrode, the auxiliary electrode and the reference electrode in a sealed mode through the second connectors; the research electrode, the auxiliary electrode and the reference electrode are all made of metal or alloys with the same material. The multifunctional same-material three-electrode probe has the advantages of convenience in electrode surface treatment, convenience and rapidity in detachment and installation, acid-base resistance, small electrode system introduction error and the like.

The invention discloses a memory, a refining process flow segmented simulation method, device and equipment, and the method comprises the steps: obtaining a raw material nuclear magnetic spectrum of a raw material oil product; generating raw material physical property data corresponding to the raw material oil product; the process flow of each device is simulated according to the upstream and downstream sequence of each device in the refining process, and the process flow simulation method comprises the following steps: generating a mass transfer-reaction equation corresponding to the device according to the device type and the process parameter of the device in the refining process; the device simulation result in the nuclear magnetic spectrum form of the raw material or the device simulation result in the nuclear magnetic spectrum form of the previous device serves as a feature vector of oil product properties, the feature vector and a mass transfer-reaction equation serve as input, and the device simulation result in the nuclear magnetic spectrum form of the device is generated through a mass transfer-reaction solver; and performing physical property calculation according to the device simulation result of the device, and analyzing the device simulation result in the nuclear magnetic spectrum form into product physical property data of the device.