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A precision capacitance sensing system and sensing method
PendingCN122083998ABreaking through the performance bottleneck of high-precision capacitive sensingEliminate measurement errorsConverting sensor output electrically/magneticallyDigital function generatorsCapacitanceTransformer
This application discloses a precision capacitance sensing system, comprising a modulation signal source, a sensitive probe, a differential transformer bridge, a signal amplification link, an analog multiplier, and a low-pass filter circuit, all connected in sequence. It also includes a demodulation reference signal source, the output of which is connected to the second input of the analog multiplier. The demodulation reference signal source is used to generate a multi-frequency combination demodulation reference signal, which is composed of a fundamental frequency component and at least two harmonic components superimposed. This invention also discloses a precision capacitance sensing method. By employing a specially designed demodulation reference signal, this application ensures that the system output remains constant within a continuously varying range of the demodulation phase difference, thereby achieving complete insensitivity to phase difference fluctuations and effectively overcoming the performance bottleneck that has long constrained high-precision capacitance sensing.
Owner:CHINESE PEOPLES LIBERATION ARMY INFORMATION SUPPORT CORPS ENGINEERING UNIVERSITY
A MEMS sensor and electronic device
The application discloses a MEMS sensor and an electronic device, wherein the MEMS sensor comprises a base, the base comprises a bottom plate, the bottom plate is provided with a first ventilation channel and an equalizing channel penetrating through the bottom plate, and the first ventilation channel and the equalizing channel are independent of each other; a cover body is fixedly connected with the base and jointly encloses the accommodation cavity with the base, the cover body is provided with a second ventilation channel; a MEMS chip is located in the accommodation cavity and is fixedly connected with the bottom plate and covers the opening of the first ventilation channel in the accommodation cavity; wherein the flow resistance of the equalizing channel to gas is greater than that of the first ventilation channel and also greater than that of the second ventilation channel. In the application, when the second ventilation channel is blocked by impurities such as dust and oil mist, the accommodation cavity can be communicated with the outside through the equalizing channel, so that the air pressure in the accommodation cavity is rapidly balanced, the signal anomaly caused by the complete sealing of the accommodation cavity is avoided, and the measurement accuracy and reliability of the MEMS sensor are effectively ensured.
Owner:MEMSENSING MICROSYST SUZHOU CHINA
Device for measuring roundness of inner and outer steel rings of bearing
ActiveCN224189215Ulow costThe linkage drive structure is simple and effectiveMachine supportsMeasurement devicesControl theoryMechanical engineering
Owner:JIANGXI ZHUODA BEARING CO LTD
Method for process phase identification of ultrahigh pressure vessels based on non-invasive temperature monitoring
The application discloses a kind of based on non-invasive temperature monitoring's superhigh pressure container process phase identification method, it is related to superhigh pressure container monitoring technical field.The upper end cover of the working cylinder body of the superhigh pressure container is installed with at least two temperature sensors in non-pressure area, and the lower end cover is also installed with at least two temperature sensors in non-pressure area;The method comprises the following steps: synchronously collecting the temperature time series data of each temperature sensor;Extracting multidimensional temperature feature vector from the temperature time series data, the multidimensional temperature feature vector includes: the instantaneous temperature difference between the upper end cover and the lower end cover measuring point, the temperature change rate of the upper end cover and the lower end cover measuring point respectively, and the time series lag feature of the temperature response of the upper end cover and the lower end cover measuring point;Based on the multidimensional temperature feature vector, the current process phase is identified, and the process phase includes at least one of the pressurization stage, the pressure maintaining stage, the pressure relief stage and the cycle stage.
Owner:CISRI HIPEX TECHNOLOGY CO LTD +1
A method and system for calibrating an oscillating high voltage generator
PendingCN122506464AGet total parameter information in real timeImprove parameter identification capabilities
This application provides a calibration method and system for an oscillating high-voltage generator. The method includes: determining the product parameter between the total inductance and total capacitance of the oscillating circuit based on the interval between adjacent peaks, and determining the total damping parameter of the oscillating circuit based on the attenuation characteristics; performing thermal correction on preset generator reference parameters based on the generator thermal characterization parameters to obtain the generator thermal parameters; separating the oscillating circuit parameters into cable equivalent capacitance, cable equivalent loss parameters, and generator parameters; performing energy storage safety verification on the cable equivalent capacitance; generating a pre-charge voltage setting value for the next excitation based on the cable equivalent capacitance when the energy storage is within limits; correcting the generator control parameters for the next excitation based on the generator parameters; generating a correction amount based on the current first peak voltage deviation; and combining the pre-charge voltage setting value, generator control parameters, and correction amount according to the amplitude limiting conditions to form a control calibration parameter group for the next pre-examination excitation. This application achieves real-time compensation for generator thermal drift and identification of cable parameters, avoiding calibration deviation problems caused by generator thermal losses.
Owner:HENAN PROVINCE INST OF METROLOGY