11results about How to "Achieving self-calibration" patented technology

The invention provides a delay time self-correction method and system in an ultrasonic flow measurement steady state, and belongs to the technical field of ultrasonic flow measurement. The method comprises the following steps: acquiring multiple periods of forward and reverse flow time of ultrasonic waves in a medium in a steady state, and respectively forming a forward flow array and a reverse flow array by the obtained multiple periods of forward and reverse flow time; performing similarity processing on the downstream array and the countercurrent array to obtain a downstream similarity coefficient and a countercurrent similarity coefficient; compensating the delay time based on the downstream similarity coefficient and the countercurrent similarity coefficient to obtain new downstream delay time and countercurrent delay time; and calculating the sound velocity of the ultrasonic wave after compensation based on the newly obtained downstream delay time and the newly obtained countercurrent delay time, and finally determining the flow velocity of the ultrasonic wave in the medium in a steady state based on the sound velocity so as to complete delay time self-correction. The method can effectively improve the accuracy and stability of ultrasonic measurement on the medium in a steady state.

The embodiment of the invention discloses a current sensor calibration method, system and device based on a T-type three-level circuit, and the method comprises the steps: adjusting the duty ratio of a horizontal tube circuit and the duty ratio of a vertical tube circuit according to a preset adjustment frequency, and obtaining a plurality of data sets; wherein each data set comprises a phase current measurement value and a transverse tube current measurement value; the phase current measurement value is acquired by a current sensor to be calibrated arranged on the phase current circuit; the transverse tube current is collected by a reference current sensor arranged on the transverse tube circuit; determining calibration parameters of the current sensor to be calibrated according to the multiple groups of data sets; and calibrating the current value collected by the to-be-calibrated current sensor by using the calibration parameter. According to the embodiment of the invention, the calibration parameters can be determined based on the calibration parameters determined by multiple groups of data sets, the precision drift of the to-be-calibrated current sensor caused by long-term use can be effectively compensated, and the high-precision self-calibration of the to-be-calibrated current sensor can be realized without extra high-cost hardware.

The invention discloses an on-site calibration system and method for servo control, belonging to the field of calibration of steam turbine servo control. The invention solves the problem that the calibration control loop of the existing steam turbine servo control device is complicated in the adjustment process of the steam turbine regulating valve and can only be operated remotely. The calibration method of the invention comprises a calibration zero position process and a calibration full position process: a calibration instruction is input into a manual instruction input module, the current state of the calibration instruction is a full-close instruction, and the inlet / exhaust oil ratio calibration control signal generated by the logic control module makes the servo valve completely closed, so that the opening of the steam turbine control actuator is 0, and the calibration zero position is completed; the calibration full position process: a calibration instruction is input into a manual instruction input module, the current state of the calibration instruction is a full-open instruction, and the inlet / exhaust oil ratio calibration control signal generated by the logic control module makes the servo valve completely open, so that the opening of the steam turbine control actuator is 100%, and the calibration full position is completed. It is used to calibrate the steam turbine control actuator.

The present invention relates to the technical field of medical safety measuring instruments, and specifically discloses a residual voltage measuring device for medical equipment, comprising: a control module, a relay module, a data acquisition module and a display device; the control module sends a control instruction to the relay module, and sends an acquisition instruction to the data acquisition module; the relay module switches to a test state according to the control instruction; the data acquisition module acquires a test voltage waveform according to the acquisition instruction, and sends it to the control module; the control module determines the positions of the peak and the trough according to the initial phase of the test voltage waveform, generates a start-stop instruction and a re-acquisition instruction according to the positions of the peak and the trough, so as to control the designated relay to be disconnected according to the start-stop instruction, and controls the data acquisition module to re-acquire the test voltage waveform according to the re-acquisition instruction; and the control module tests the re-acquired test voltage waveform to generate and display a test result; the display device is used to output and display the test result.

The invention discloses an automatic test characterization system and method for an optical phased array chip, and belongs to the field of equipment testing, and the method comprises the steps: carrying out the state initialization calibration of a test characterization system, and guaranteeing that the system is in a good calibration state; obtaining test characterization parameters input by a user; determining a test process according to test characterization parameters input by a user, and carrying out automatic test characterization; performing algorithm processing on the test data generated by the test system, and automatically generating a test characterization result report; and evaluating the performance of the phased array chip according to the generated characterization result report, and judging whether the phased array chip passes the test or not. According to the automatic test characterization system and method, the test characterization efficiency of the optical phased array chip can be effectively improved, and the inconsistency of test characterization results caused by human factors is avoided to the greatest extent.

According to the SERS-ECL dual-mode biosensor for detecting lipopolysaccharide, an LPS signal is converted into a nucleic acid signal, and meanwhile, a C-rich long chain is generated by utilizing RCA to be combined with high-activity Ag < + > at the tip of Au (at) AgNC to be separated from a cube, so that endpoints of the cube are passivated, electron transfer between a core and a shell is reduced, hot spots are reduced, and SERS signals are reduced; and a C-Ag < + >-C structure formed by combination is subjected to in-situ reduction by using NaBH4 to generate AgNC, electron transfer is realized under the action of a co-reactant, and an ECL signal is increased. Compared with a single-mode sensor, the SERS-ECL dual-mode sensor can realize self-calibration of a biosensor, and the detection accuracy is improved. In addition, the detection sensitivity of the LPS is improved through accurate identification and rolling circle amplification of the LBA. The biosensing platform has a wide detection range from 1 fg / mL to 1 ng / mL, and the SERS (Surface Enhanced Raman Scattering) detection limit and the ECL detection limit are 0.2915 fg / mL and 0.1433 fg / mL respectively.

The invention discloses a method and system for monitoring chloride ions in concrete, belonging to the technical field of concrete monitoring. The chloride ion monitoring system performs multi-point real-time monitoring on the chloride ion concentration inside the concrete through the linear relationship between the fluorescence wavelength change value and the chloride ion concentration. The chloride ion monitoring system comprises an excitation light source, a spectrometer, a filter, a fluorescent probe, and an optical splitter; the fluorescent probe is obtained by encapsulating cesium lead bromide with a porous polymer obtained by reacting octaallyl bromide-POSS with a diamine compound to obtain fluorescent nanoparticles, and click chemistry is performed under ultraviolet light reaction through double bonds in the outer layer of the fluorescent nanoparticles and double bonds on the surface after optical fiber cone modification and thiol, so as to obtain the fluorescent probe through photoplating.

The invention relates to a high-precision self-calibration wedge angle measuring system which comprises a light source, a first CCD camera, a light condensing sheet, a light splitting sheet, a reflecting sheet, a convex lens, a sample to be measured and an upper computer, and the upper computer is connected with the first CCD camera. The self-calibration wedge angle measurement system constructed by the invention can be used for accurately and effectively measuring the wedge angle of an object (namely a sample to be measured) made of a transparent or semitransparent material with an angle; when the wedge angle is measured, communication can be provided for the assisting mechanical arm, the inclination angle of the assisting mechanical arm is automatically adjusted, internal self-calibration is achieved, extra measurement calibration is not needed, and the measurement effectiveness is guaranteed.

The present application relates to the technical field of intelligent management of color steel composite board, and particularly relates to a color steel composite board production data intelligent management system; the system comprises a data acquisition module, a plate blank tracking module, an energy consumption collection module, an energy consumption analysis module and a feedback optimization module. The present application realizes accurate identification of the time node of the plate blank entering the foaming furnace, guarantees the accuracy of energy consumption statistics, and realizes fine energy management; each plate blank is tracked in real time by using the fusion of vision and RFID, and its "energy consumption responsibility period" in the foaming furnace is accurately defined, and then the total energy consumption is accurately collected to a single plate blank by using integral calculation and proportional allocation, when an energy consumption anomaly is detected, the accuracy of the tracking time sequence is first verified to realize system self-calibration; if the time sequence is correct, further superimposed analysis of key parameter curves such as gas flow, temperature, speed and raw material pressure is performed, the abnormal reason is intelligently judged, and the parameters are automatically adjusted or the precise alarm is triggered.

This invention discloses an intelligent control system for data acquisition and processing of a digital operation platform, belonging to the field of data acquisition and processing technology. It includes a sensing terminal, an edge terminal, and a cloud terminal. The sensing terminal acquires multi-source data to obtain terminal-sensed data, evaluates the contribution of each unit's categorized data, obtains the contribution degree of each unit's categorized data, adjusts the acquisition parameters based on the contribution degree, and transmits the terminal-sensed data to the edge terminal according to the contribution degree. The edge terminal then distributes the categorized data of each unit to the cloud terminal based on the contribution degree. The cloud terminal analyzes the terminal-sensed data based on a preset cloud analysis method to obtain cloud analysis results. It identifies the contribution degree of each unit's categorized data and analyzes control link information, classifies the analysis control link information according to the contribution degree, obtains the security protection classification corresponding to each link's step information, and performs dynamic differentiated security protection processing based on the security protection classification.

This utility model relates to the technical field of nozzle assembly devices, and in particular to a pick-and-place machine nozzle assembly with an anti-offset mechanism. It includes a pick-and-place machine frame and multiple sets of nozzle structures disposed on its outer wall. Each nozzle structure includes a drive arm slidably connected to the outer wall of the pick-and-place machine frame. This utility model uses two sets of positioning plates symmetrically arranged inside multiple sets of annular suction heads. A micro-motor enables the two sets of positioning plates to slide away from each other. The flat working surfaces of the positioning plates support the inner walls of the center holes of the components being placed. During the sliding process, the positioning plates push the components through rigid contact until the inner walls of the center holes of the components are completely in contact with the two sets of positioning plates. At this point, the center of the components coincides with the reference point. This allows for rapid center self-calibration of components placed in the center holes, enabling accurate positioning and pickup of the components, preventing offset after suction and fixing, and improving the quality of subsequent placement.