9results 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.

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 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.

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.

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 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 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.