A high-accuracy, high-speed interface circuit for differential-capacitance transducer

Hu, Hongli; Xu, Tongmo; Hui, Sisi

doi:10.1016/j.sna.2005.08.009

Cited by 25 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The measuring section is a quartz glass pipe of length 1.20m, and its inner and outer diameters are 96mm and 100mm. The capacitance measuring circuit is a C/V (capacitance to voltage) conversion circuit, an excitation voltage with 1MHz frequency and 3.3V amplitude are used [23]. 2-electrode and 4-electrode are studied in experimental part, each electrode is scattered evenly around the insulating wall.…”

Section: Resultsmentioning

confidence: 99%

Simulation Analysis of Capacitance Method in Two-Phase Flow Concentration Measurement by Coupled Fields

Wang

et al. 2016

Preprint

View full text Add to dashboard Cite

This paper proposed three-dimensional numerical simulation method by coupling of electrostatic and fluid fields to evaluating the performance of electrical sensor in the concentration measurement of gas/solid two-phase flow. Compared with the static numerical simulation, this real-time dynamic 3-D simulation method can research on a designed capacitance sensor combining the dynamic characteristics of the two-phase flows for concentration measurement. Several fluid-electrostatic models of transmission pipes with different sensor structures are built. Under different test positions and different particle concentrations, the flow characteristics and the corresponding electric signals can be obtained, and the correlation coefficient between the concentration values and the capacitance values are used for performance evaluation of the sensors. The effects of flow regimes on concentration measurement are also been investigated in this paper. To validate the results of simulation, an experimental platform with horizontal straight pipe for phase volume concentration measurement of solid/air two-phase flow is built, and the experimental results agree well with simulation conclusions. The simulation and test results show that the coupling models can give constructive reference opinions for the sensor design and collection of installation position in different transmission pipelines, which are very important for the practical process of pneumatic conveying system.

show abstract

Section: Resultsmentioning

confidence: 99%

Simulation Analysis of Capacitance Method in Two-Phase Flow Concentration Measurement by Coupled Fields

Wang

et al. 2016

Preprint

View full text Add to dashboard Cite

show abstract

“…The circuit adopts an excitation voltage with 1V amplitude and 1 MHZ carrier. Then a DSP with 2-channel 18-bit ADC is used for logic control and data processing [30]. With digital data, the medium spatial distribution can be obtained through reconstruction algorithm.…”

Section: The Construction Of Ect Systemmentioning

confidence: 99%

An extreme learning machine combined with Landweber iteration algorithm for the inverse problem of electrical capacitance tomography

Liu

Wang

et al. 2015

Flow Measurement and Instrumentation

View full text Add to dashboard Cite

“…[25] It consists of a current detector with a capacitor-array, a precision rectifier circuit, and a second-order low-pass filter, which acted as the amplitude modulation modulator and demodulator, respectively. An excitation voltage with 1 MHz carrier frequency and 1 V amplitude was used.…”

Section: Measurement Circuit and Data Processing Systemmentioning

confidence: 99%

“…A digital signal processor with a two-channel 18-bit analog-to-digital converter was used for data processing and logic control. [25] The capacitance value of each coupled electrode and the average capacitance value were measured by the circuit. …”

Section: Measurement Circuit and Data Processing Systemmentioning

confidence: 99%

Concentration Measurement of Dilute Pulverized Fuel Flow by Electrical Capacitance Tomography

Wang

Liu

et al. 2014

Instrumentation Science & Technology

View full text Add to dashboard Cite

& In order to eliminate the effects of flow regimes on phase concentration measurements, electrical capacitance tomography (ECT) was employed to improve the measurement accuracy. The solid particle distribution in the flow pipelines were characterized by measuring capacitance to obtain flow patterns. An improved offline iteration online reconstruction (OIOR) algorithm was proposed as the image reconstruction for the ECT system and a method of two-dimension maximum entropy threshold image segmentation was used for further image processing. Dynamic experiments were carried out for gas=solid two-phase flows. First, the flow regime was identified by the ECT, and the results were used to trace the fluctuation of the dynamic two-phase flow online. The volume concentrations were then calculated based on the reconstructed results. The experimental results indicate that the average relative error of the concentration measurements was about 1.5% over a pulverized coal volume concentration range 0.96-4.97%.

show abstract

A high-accuracy, high-speed interface circuit for differential-capacitance transducer

Cited by 25 publications

References 11 publications

Simulation Analysis of Capacitance Method in Two-Phase Flow Concentration Measurement by Coupled Fields

Simulation Analysis of Capacitance Method in Two-Phase Flow Concentration Measurement by Coupled Fields

An extreme learning machine combined with Landweber iteration algorithm for the inverse problem of electrical capacitance tomography

Concentration Measurement of Dilute Pulverized Fuel Flow by Electrical Capacitance Tomography

Contact Info

Product

Resources

About