20results about How to "Improve measurement resolution" patented technology

The invention discloses a signal calibration method and system for semiconductor testing equipment, and relates to the technical field of semiconductor testing, and the method comprises the steps: selecting a calibration port, controlling a relay matrix to enable a source measurement channel, a time measurement channel and an electrical sensor to be connected to a same Kelvin terminal, and carrying out the calibration of a calibration signal; transmitting a calibration pulse train, extracting a sending segment, an arrival segment and a backflow segment, and obtaining a port mirror image routing table and a baseline segment table; controlling the calibration pulse train to execute commutation sending and polarity flipping along a path corresponding to the port mirror image routing table, and comparing an arrival fragment, a backflow fragment and a front and back edge sequence to obtain a commutation difference table and a polarity setting code table; and the calibration pulse train is controlled to enter the measured branch and the reference straight-through branch respectively, and single-stage trimming is carried out on the comparison judgment chain and the delay unit chain. According to the invention, the measured branch and the reference straight-through branch are compared in parallel, and the comparison judgment chain and the delay unit chain are trimmed step by step, so that the measurement resolution of the time parameter is remarkably improved.

The application provides a frequency standard measurement method, device, computer equipment and storage medium, the method comprises: frequency source output measurement signal is carried out frequency division processing, obtains low frequency pulse signal; using high-precision time interval counter to low frequency pulse signal is carried out delay measurement and time interval counting, and is output in the form of time stamp; by setting a sliding window, using sliding average algorithm to time stamp is carried out sliding average filtering processing, all time stamps are carried out sliding difference to obtain time difference, time difference is grouped according to order and is taken average in group to obtain average time difference; by increasing the length of the sliding window, the number of samples is increased to reduce the statistical error; using average time difference, calculate frequency measurement value, relative frequency deviation and allan variance. The method of the application increases the sliding window, and the frequency measurement result obtained by the algorithm of grouping and averaging the time difference has higher measurement precision and stability.

The utility model discloses a microwave material contourgraph. The microwave material contourgraph comprises a host and at least one measuring module, the host is in communication connection with the measurement module, and the measurement module comprises a support structure and a plurality of microwave measurement units; the plurality of microwave measurement units are arranged on the support structure in an array and are at least used for measuring the contour of a common charge level. According to the microwave material contourgraph provided by the utility model, the microwave measuring units are arranged on the bracket structure in the array to measure the contour of the common material surface, and microwaves can penetrate through a dust environment to detect the material, so that the effective detection of the contour of the material is realized; therefore, the technical problem that an existing material contourgraph adopting the laser and camera principle is difficult to effectively detect the material contours is solved.

The present invention discloses a handle-type blade with three pressure-sensing holes at the leading edge of a primitive stage, comprising pressure sensing holes, a pressure-inducing channel, a handle, a pressure-inducing pipe interface, and a low-loss bend pipe. The leading edge of the blade has multiple rows of pressure sensing holes along the blade height direction, and each row comprises three pressure sensing holes, which are respectively distributed at the leading edge point of the primitive stage, the pressure surface, and the suction surface; the pressure-inducing channel is respectively connected to the orifice of the pressure sensing hole and the pressure-inducing pipe interface, and a low-loss bend pipe is used at the bend. The present invention can simultaneously measure the total pressure, static pressure, deflection angle, and Mach number of the airflow at the outlet of the compressor rotor along the blade height direction and at multiple primitive stage positions, and is suitable for measuring the distribution of the two-dimensional flow field parameters at the rotor outlet along the blade height direction. The present invention not only has the aerodynamic performance and strength of conventional blades, but more importantly, has the function of measuring aerodynamic parameters. Compared with conventional probes and blade-shaped probe measurement technologies, the present invention has no protruding probe, does not interfere with the measured flow field structure, does not affect the aerodynamic performance of the blade itself, and has high accuracy in measuring parameters.

The invention discloses a portable multi-view-field measuring device which comprises a shell, a color combination prism, two optical reflectors and two optical adjusting frames, wherein the color combination prism, the two optical reflectors and the two optical adjusting frames are fixed in the shell; a cover is arranged on the outer side of the shell, a structure for fixing a color combination prism is arranged in the middle of the inner side of the shell, and structures for installing optical adjusting frames are arranged on the two sides of the inner side of the shell. The left and right sides of the front surface of the housing are respectively provided with an optical path window. The housing is fixed on the lens of the camera. The optical reflector reflects the light source penetrating through the target measurement area of the light path window to the color combination prism; the optical adjusting frame is used for installing and adjusting the optical reflecting mirror; and the color combination prism is used for filtering the reflected light of the optical reflector, so that the light with the specified wavelength enters a lens of the camera and is imaged on an image sensor of the camera. According to the device, on the basis of not losing the measurement resolution and not increasing image elements of the image sensor, the measurement resolution of a small moving object in a large moving range is improved.

The invention discloses a wafer overlay error measurement method based on Halcon, and belongs to the technical field of computer graphics. According to the method, based on an operator function provided by Halcon software, firstly, images of different areas of an overlay error mark are extracted from a wafer image, and a corresponding template is generated based on the images; and for the wafer image of which the overlay error is to be measured, searching a corresponding overlay error mark area by using the overlay error mark template, and realizing the overlay error measurement of a sub-pixel level, thereby calculating the offset between different layers. According to the method, the measurement precision and efficiency are remarkably improved, and the method can adapt to various complex chip scenes. Through step-by-step template search, error interference and calculation cost in a measurement process are effectively reduced. The method is excellent in performance in various chip environments, the measurement time of a single wafer image is shorter than one second, an efficient and reliable overlay error measurement solution is provided, and the method has wide industrial application prospects.

This invention relates to the field of ground testing technology for spacecraft attitude control systems, specifically providing a ground testing method for the accuracy of a multi-level composite attitude control system. First, a fully physical simulation ground testing platform is constructed, including an on-orbit environment simulation system and a multi-level composite attitude control simulation system. Two reference calibration devices are built using a calibrated dual-axis photoelectric autocollimator, and two measurement reference units are constructed using the dual-axis photoelectric autocollimator and a multifaceted prism. Based on a cubic mirror, the calibrated dual-axis photoelectric autocollimator, and the dual-axis photoelectric autocollimator, zero-position reference calibration and angle calibration are performed on the multi-level composite attitude control simulation system. After calibration, the multi-level composite attitude control simulation system is controlled to move from the initial position to the final position, and angle information is collected through the two measurement reference units. The attitude control accuracy is calculated based on the angle information. This invention realizes ground testing of a multi-level composite attitude control system based on fully physical simulation.

The application discloses a time-domain sensitivity regulation optical fiber sensing method based on dynamic wavelength time mapping. The method in the embodiment of the application is programmable control to the dynamic wavelength tuning process, constructs a nonlinear mapping relationship between the wavelength and the time, forms a time-domain sensitivity window with adjustable position, width and peak value on the time axis, makes the same wavelength change produce an amplified time response in a predetermined time region, and thus realizes active design and engineering regulation of the measurement sensitivity without changing the sensor structure and the intrinsic wavelength sensitivity. The method of the application is suitable for various optical fiber sensing scenes.

The invention relates to a high-precision resonance ball type pressure and temperature integrated sensor, which is characterized in that a resonance ball and a resonance ball fixed support structure are integrally processed, the outer wall of the resonance ball is provided with a resonance ball surface electrode, and the inner wall of a spherical groove on a back cavity structure is provided with a back cavity structure surface electrode; the resonance ball clamped structure and the back cavity structure realize vacuum sealing through a bonding layer, an absolute pressure measurement vacuum cavity is formed between the resonance ball and the spherical groove after sealing, and surface electrodes of the resonance ball are in one-to-one correspondence with surface electrodes of the back cavity structure; a temperature measuring element is arranged on the outer wall of the resonance ball and used for sensing the temperature of the resonance ball in situ, and in-situ temperature error compensation of pressure measurement is achieved. According to the invention, real-time synchronous measurement of pressure and temperature is realized, and in-situ temperature compensation of pressure measurement is also realized, so that the measurement precision, long-term stability and temperature following performance of the pressure sensor are improved.

The present invention belongs to the technical field of tunnel detection, and discloses a tunnel segment assembly detection method and detection system. The present invention arranges a line structured light sensor and a surface structured light sensor on the suction cup of the segment assembly machine, and uses the line structured light sensor and the surface structured light sensor to perform real-time measurement during the segment assembly process to obtain measurement data. That is, the present invention proposes a real-time measurement scheme for the assembly position relationship of tunnel segments based on the fusion of line and surface structured light, adopts structured light three-dimensional measurement technology, and achieves complementarity in measurement accuracy and measurement range in the form of a combination of line structured light sensors and surface structured light sensors, and can accurately and quickly obtain the relative position relationship between segments.

This invention relates to a multi-bus data fusion processing method and system based on a logging tool, belonging to the field of oil and gas drilling measurement data transmission technology. The method includes receiving logging data collected by the logging tool's measurement probe and different data packets sent by the system bus; performing preliminary processing on the received logging data, including self-identification, self-diagnosis, and self-correction; identifying and converting the different received data packets; performing real-time fusion processing on the self-identified, self-diagnosed, and self-corrected logging data and the identified and converted data packets; and packaging the real-time fused data according to different communication protocols, and sending the packaged data to the system bus and / or storage unit. This invention forms a multi-bus data fusion processing system, which is embedded in the logging tool connected to the drilling string, enabling data interaction between the logging tool and other instruments in the instrument string, and achieving parallel processing and self-diagnosis of multiple sets of data.

The present invention discloses a tenon blade with three pressure-sensing holes at the leading edge of a primitive stage, comprising pressure-sensing holes, a pressure-inducing channel, a blade top tenon, a pressure-inducing pipe interface, and a low-loss bend pipe. The leading edge of the blade has multiple rows of pressure-sensing holes along the blade height direction, and each row comprises three pressure-sensing holes, which are respectively distributed at the leading edge point of the primitive stage, the pressure surface, and the suction surface; the pressure-inducing channel is respectively connected to the orifice of the pressure-sensing hole and the pressure-inducing pipe interface, and a low-loss bend pipe is used at the bend. The present invention can simultaneously measure the total pressure, static pressure, deflection angle, and Mach number of the airflow at the outlet of the compressor rotor along the blade height direction and at multiple primitive stage positions, and is suitable for measuring the distribution of the two-dimensional flow field parameters at the rotor outlet along the blade height direction. The present invention not only has the aerodynamic performance and strength of conventional blades, but more importantly, has the function of measuring aerodynamic parameters. Compared with conventional probes and blade-shaped probe measurement technologies, the present invention has no protruding probe, does not interfere with the measured flow field structure, does not affect the aerodynamic performance of the blade itself, and has high accuracy in measuring parameters.

According to the biplane DC-RF compound field driving coil system for the optical pump magnetometer, the complexity, noise and volume of the system are reduced and the measurement sensitivity and integration degree are improved by unifying the geometric configuration and differential parameters of the biplane, and particularly, the high-frequency magnetic field distortion and frequency dispersion effect in a magnetic shielding environment are optimized. Specifically, the problems of insufficient magnetic field uniformity, enhanced electromagnetic interference and RF magnetic field distortion in a large-volume area caused by non-uniform coil configuration in the traditional design are solved, so that the high uniformity of the magnetic field is realized, and the space utilization rate and the signal quality of a system are improved, and the system is characterized by comprising a standard coil unit and a radio frequency coil unit, the standard coil unit and the radio frequency coil unit both adopt a biplanar coil configuration after simulation optimization, the biplanar coil comprises a left planar coil and a right planar coil, and the left planar coil and the right planar coil are parallel, coaxially and symmetrically arranged on the two sides of a target area and used for generating and compensating a shimming magnetic field.

The invention provides an equidistant stripe rotating speed measuring method, which solves the strict requirements on the diameter of a large shaft, the perimeter of a wheel shaft, the stripe spacing and the spacing between the large shaft and a receiver in the prior art. The method comprises the following steps: sticking equidistant reflective stripe stickers on the edge of a detected large-shaft turntable; the laser transmitters and the laser receivers are installed on a measuring support of the mechanical measuring instrument in pairs; due to the design of the equidistant reflective stripe stickers, when the large shaft rotates by a certain distance, the laser receiver receives a fixed number of pulses; and calculating the number of pulses received per unit time so as to determine the rotating speed of the large shaft. The method adopts the infrared laser, is not interfered by water vapor, is high in measurement precision, does not need to accurately measure and adjust the wheel diameter, the perimeter, the stripe interval and the distance between the large shaft and the receiver, and simplifies the field operation. The sticker pasting method is simple and easy to implement, is suitable for large shafts with different diameters and perimeters, and has wide applicability and high resolution.

The present invention discloses a multi-frequency linear array laser three-dimensional precision scanning method based on a metasurface array, including two laser linear array coding measurement modes of multi-frequency discrete and multi-frequency fusion. Based on a multi-frequency laser light source, a rectangular aperture, a filter array and a metasurface array, a refined discrete focus projection or fusion focus projection of a multi-frequency laser linear array on the surface of a target object can be realized. The projected laser linear array on the surface of the target object is imaged through an imaging lens and a photosensitive element, and the surface contour information of the target object is obtained by solving the geometric relationship of triangulation. This method uses a metasurface to replace traditional complex and bulky projection equipment, with a compact structure and strong functionality. It can realize diffraction-limited focus projection of multi-frequency linear array lasers, improve scanning accuracy and measurement resolution, and the coding measurement mode can adapt to the surface of target objects of different materials, taking into account both measurement efficiency and contour reconstruction integrity.

The application discloses an automatic zero adjustment circuit and method for a mass flow controller and relates to the technical field of instruments and meters. The circuit comprises a zero adjustment enabling signal generation unit configured to generate a zero adjustment enabling signal after entering a control idle period; a start clock signal generation unit configured to generate a clock signal based on the zero adjustment enabling signal; a sensor signal zero point judgment unit configured to generate a zero voltage change signal based on an analog output voltage of a sensor of the mass flow controller and a preset voltage value; a counter analog-digital converter unit configured to generate a zero voltage based on the zero voltage change signal and the clock signal; and a compensation voltage real-time adjustment unit configured to compensate the analog output voltage of the sensor of the mass flow controller based on the zero voltage output by the counter analog-digital converter unit. The application realizes automatic zero adjustment and improves the zero adjustment precision.

The embodiment of the invention relates to an accelerator beam parameter calculation method and device, and the method and device have the beneficial effects that after a BPM digital signal is obtained, the BPM digital signal is demodulated through an NON-IQ algorithm, compared with a common digital IQ demodulation algorithm, a DC offset component and a clock jitter error can be effectively suppressed, and the measurement resolution and the anti-interference capability are remarkably improved. Meanwhile, after the I signal and the Q signal are obtained, the target position and the target phase of the accelerator beam can be accurately obtained through calculation of a CORDIC algorithm. In addition, the Non-IQ algorithm formula is simple, digital, simple and practical, the program flow and codes are easy to develop and implement in FPGA hardware, and the measurement result can be observed in real time and at a high speed through the algorithm implementation in the FPGA.

The utility model provides a sulfur hexafluoride dual-channel sensor, relates to the technical field of gas detection, and aims to solve the technical problem that an infrared sulfur hexafluoride sensor is poor in measurement accuracy and stability. Comprising an optical gas chamber, a light source and a detector, the light source and the detector are arranged in the optical gas chamber, the light source and the detector are arranged at the two ends of the optical gas chamber respectively, the optical gas chamber is communicated with the outside, and the light source reflecting surface is located above the light source and used for steering light emitted by the light source; the detector reflecting surface is positioned above the detector and is used for gathering the light rays reflected by the light source reflecting surface onto the detector; the detector reflecting surface comprises a detector reflecting surface I and a detector reflecting surface II, and the detector reflecting surface I and the detector reflecting surface II are symmetrically arranged in parallel. According to the utility model, by designing the light path reflecting surface in the gas chamber, the dual-channel detector can obtain high-efficiency light information, so that the absorption rate of gas to infrared light is improved, and the measurement precision and stability of the sensor are further improved.

The invention discloses a test device and method for measuring reverse jet flow interference force of a main engine of an aircraft. Comprising a model body and a supporting rod used for installing the model body on a wind tunnel test section. The jet flow generator is detachably mounted at one end of the model main body, and the cold jet flow generator or the hot jet flow generator can be selected to be connected with the model main body according to requirements; the force measuring balance system comprises a first force measuring balance used for measuring thrust generated by the main engine and a second force measuring balance used for measuring pneumatic disturbing force borne by the model main body; the air supply system is used for supplying air to the jet flow generator; and the data acquisition system is used for synchronously acquiring output signals of the first force measuring balance and the second force measuring balance so as to realize independent measurement of the thrust of the main engine and the pneumatic disturbing force. The test device provided by the invention can be widely applied to aerodynamic force measurement under the condition of large high-low load difference, and provides high-precision test data support for the design of an aircraft control system under the reverse jet interference condition of a main engine.

The application discloses a kind of full-automatic coagulation instrument reagent needle liquid level detection methods, comprising the following steps: S1: send ultrasonic pulse signal measurement liquid level change;S2: application intelligent algorithm dynamic compensation error;S3: fusion multi-sensor data optimization liquid level calculation;S4: monitor liquid level and trigger abnormal alarm;S5: realize adaptive learning and optimize system performance;S6: store data and carry out remote monitoring.The application is measured by error model dynamic compensation, ultrasonic wave propagation characteristics and multi-sensor data fusion and intelligent algorithm optimization, significantly improve the accuracy of liquid level measurement, enhance environmental adaptability, reduce error.