14 results about "Capacitance to digital converter" patented technology

The invention relates to the technical field of flexible electronic sensing, and particularly discloses a composite fiber membrane-based capacitive flexible pressure sensor integrated system and a preparation method thereof. The sensor is composed of a composite fiber membrane sensitive layer, an interlayer type electrode structure, a multi-channel signal acquisition module and an intelligent data processing system. Wherein the composite fiber membrane is prepared through an electrostatic spinning technology, polyvinylidene fluoride serves as a matrix, ionic liquid with the mass ratio of 40%-70% is evenly dispersed, a three-dimensional porous structure is formed, and a pressure signal is converted into capacitance change through the double-electric-layer capacitance effect; the signal acquisition module adopts a high-precision capacitance digital converter to cooperatively work with a microcontroller, 9-channel parallel data acquisition is realized, the resolution reaches 6aF, and data is transmitted through an anti-interference bus protocol; and the data processing system dynamically analyzes the pressure-capacitance relationship based on an exponential function model, suppresses noise to be below 0.1 aF RMS in combination with a filtering algorithm, and synchronously generates a visual pressure distribution map.

A capacitive force / torque sensor utilizing two PCBs with an array of silicone pillars as the dielectric material is provided. This design enables the sensor to detect all six axes of force and torque with just two PCBs, thanks to a specially designed comb-shaped electrode pattern and the capabilities of the microcontroller being used. The microcontroller includes a capacitive-to-digital converter module, allowing firmware-controlled connections to the comb-shaped electrodes. By reconfiguring these electrical connections, the sensor can individually adjust the sensitivity of electrodes to specific subsets of force and torque inputs or combine multiple electrodes to enhance sensitivity to different subsets. This innovation allows the sensor to efficiently sense six-axis force and torque using compact, cost-effective components.

A capacitive sensor and capacitive sensing data integration for monitoring plasma chamber conditions are described. In an example, the plasma chamber monitoring system includes: multiple capacitive sensors; a capacitance-to-digital converter (C / D); and an application processing server coupled to the C / D, the application processing server including system software. The C / D includes: an insulating interface coupled to the multiple capacitive sensors; a power supply coupled to the insulating interface; field-programmable gate array (FPGA) firmware coupled to the insulating interface; and an application-specific integrated circuit (ASIC) coupled to the FPGA firmware.

A capacitive reading device for a pointer instrument, wherein n radial electrodes alternating with radial counter electrodes are arranged opposite the pointer instrument in an arc to capacitively detect the position of a rotating pointer of the pointer instrument, where the counter electrodes are electrically connected to one another and connected to a first measurement connection of a capacitance digital converter, the n electrodes are connected to a second measurement connection of the capacitance digital converter via an n×k connection matrix and a downstream 1-of-k multiplexer, the n×k connection matrix connects each of the n electrodes to in each case one of k channels of the 1-of-k multiplexer, the connection pattern varies along the arc with n variations of b from k, and where n>k≥b>1.

The present invention relates to a device for measuring secretions of a living organism, comprising an absorption membrane, an electrode sensing assembly, a capacitance-to-digital converter (CDC) circuit, and a processing module. The absorption membrane is used to absorb secretions from the living organism. The capacitance-to-digital converter circuit is coupled to the electrode sensing assembly and is used to detect the countercapacitance at the absorption membrane in the presence of secretions. The processing module is coupled to the capacitance-to-digital converter circuit. The processing module is used to detect the countercapacitance at the absorption membrane in the absence of secretions and, based on the two detected countercapacitances, to output a signal indicating the concentration of substances secreted by the living organism.

Disclosed are a power-efficient continuous-discrete time hybrid delta-sigma capacitance-to-digital converter for capacitance measurement and an operation method thereof. The power-efficient continuous-discrete time hybrid delta-sigma capacitance-to-digital converter for capacitance measurement proposed in the present invention comprises: a continuous-time capacitance-to-voltage converter which reduces a total noise bandwidth by using anti-aliasing characteristics, and converts an input capacitor value into a voltage; a discrete-time switched-capacitor integrator which receives the voltage, increases power efficiency by using a floating inverter amplifier (FIA), and performs an integration operation; a second-order noise-shaping SAR ADC which quantizes an output of the discrete-time switched-capacitor integrator; and a DSM C-DAC which provides third-order noise-shaping characteristics, increases resolution, and constitutes a DSM loop.

The invention discloses a calibration device and a calibration method based on a 24-bit capacitance-to-digital converter, and belongs to the field of high-precision analog-to-digital conversion. The device is used for circuit calibration and test of the 24-bit capacitance-to-digital converter and comprises a hardware part and a software part, the hardware part adopts an acquisition control panel with an SOC + FPGA architecture, and the software adopts a Labview architecture. Synchronous sampling is carried out through the two customized sockets, so that the capacitance value and voltage calibration of the capacitor is realized; the to-be-calibrated chip and the TS temperature sensor are placed in the same cavity through the customized socket, so that the temperature calibration error is reduced; sHLD signals acquired by the FPGA can be converted into excitation sources, but data acquisition is abnormal, two sets of FPGA programs are adopted, one set is used for excitation calibration, and the other set is used for capacitance, voltage and temperature calibration and testing; and automatic control is facilitated. The device mainly comprises an ADC general test platform, a 24-bit capacitance digital converter calibration daughter board, a high-precision DA, a TS temperature sensor, a customized socket and the like.

The embodiment of the invention discloses a capacitance type ship cylinder sleeve abrasion monitoring device and method, differential capacitance is obtained through two movable pole plates and a fixed pole plate which are arranged in a sealing box, the differential capacitance is converted into a digital signal through a capacitance-digital converter, and the inner diameter of a cylinder sleeve is obtained through a signal processing and control unit. Abrasion monitoring of the cylinder sleeve of the large two-stroke diesel engine for the ship is achieved in an auxiliary mode. According to the invention, measurement can be completed by using the existing scavenging port and piston movement under the condition of no cylinder hanging, the ceramic ball is abutted against and separated from the inner wall of the cylinder sleeve by using the tensioning mechanism, the ceramic ball can be prevented from scratching the inner wall of the cylinder sleeve, and the whole device is adjusted through inclination and rotation two degrees of freedom through the inclination auxiliary device and the slewing bearing, so that the measurement precision is improved. And the monitoring accuracy can be improved by accurate leveling. By adopting capacitive differential measurement, submicron resolution can be realized, the device is not influenced by oil film and material magnetism, and compared with a traditional mechanical measuring instrument, the device is high in precision and quick in response, and does not need an additional calibration medium.

Capacitance sensors and integration of capacitance sensing data for plasma chamber condition monitoring are described. In an example, a plasma chamber monitoring system includes a plurality of capacitance sensors, a capacitance digitizer, and an application processing server coupled to the capacitance digitizer, the application processing server including system software. The capacitance digitizer includes an isolation interface coupled to the plurality of capacitance sensors, a power supply coupled to the isolation interface, a field programmable gate array firmware coupled to the isolation interface, and an application specific integrated circuit coupled to the field programmable gate array firmware.

An assembly (decoupled grain sampler and moisture content reader) for measuring grain moisture and sharing the grain moisture information with a database, other framers, and merchants, including a grain receiving chamber, at least one plate capacitor operationally connected to the grain receiving chamber, a capacitance to digital converter (or similar device) operationally connected to the at least one plate capacitor, a microprocessor operationally connected to the oscillator, a user interface operationally connected to the microprocessor, a smartphone app in operational communication with the microprocessor, and a transceiver operationally connected to the microprocessor and the smartphone app.

The invention discloses a capacitive pressure differential signal measuring circuit and method based on an AD7746 chip, and particularly relates to a four-electrode sensor, a measuring range expansion circuit, a capacitance digital converter and an STM32 embedded control chip. The measuring method is a capacitive pressure measuring method, high-precision capacitance is measured in a differential mode, and a high-precision pressure value is obtained through capacitance-pressure conversion. The lower part of the capacitance digital converter is connected with the range expansion circuit for expanding the range, the upper part of the capacitance digital converter is connected with the STM32 for data processing and transmission, and the lower part of the range expansion circuit is connected with the four-electrode sensor for capacitance measurement. A differential measurement method is utilized, high-precision and high-resolution capacitance measurement can be realized under the condition of effectively reducing parasitic capacitance and external noise interference by matching with a four-electrode sensor, and capacitance data is processed through an STM32 and converted into a high-precision pressure value.

Capacitive sensors and capacitive sensing data integration for plasma chamber condition monitoring are described. In an example, a plasma chamber monitoring system includes a plurality of capacitive sensors, a capacitance digital converter, and an applied process server coupled to the capacitance digital converter, the applied process server including a system software. The capacitance digital converter includes an isolation interface coupled to the plurality of capacitive sensors, a power supply coupled to the isolation interface, a field-programmable gate-array firmware coupled to the isolation interface, and an application-specific integrated circuit coupled to the field-programmable gate-array firmware.

The application provides a correlated double sampling front-end readout circuit, a capacitance digital converter and a sensor, and relates to the technical field of analog-to-digital conversion. The application comprises a pre-charging unit, a sampling conversion unit and an operational amplifier unit; in a first pre-charging stage, the pre-charging unit receives an external voltage for pre-charging, and a first capacitor array in the sampling conversion unit is discharged; in a first sampling stage, the operational amplifier unit transfers the charge obtained in the pre-charging stage to the sampling conversion unit for sampling; in a quantization stage, the sampling conversion unit is converted to obtain a quantization result. The application discards the traditional mode of two pre-charging stages and two sampling stages, and the proposed new correlated double sampling front-end readout circuit only needs one pre-charging and one sampling operation, so that the required time of the pre-charging stage is reduced to 1 / 3 of the original time, thereby greatly reducing the working time of the operational amplifier and indirectly reducing the overall power consumption of the capacitance digital converter.