A Study on the Design of A Semi-Cylindrical Capacitive Sensor for Intravenous Drip Detection

Abstract Ice thickness is one of the most critical physical indicators in the ice science and engineering. It is therefore very necessary to develop in-situ automatic observation technologies of ice thickness. This paper proposes the principle of three new technologies of in-situ automatic observations of sea ice thickness and provides the findings of laboratory applications. The results show that the in-situ observation accuracy of the monitor apparatus based on the Magnetostrictive Delay Line (MDL) principle can reach ±2 mm, which has solved the “bottleneck” problem of restricting the fine development of a sea ice thermodynamic model, and the resistance accuracy of monitor apparatus with temperature gradient can reach the centimeter level and research the ice and snow substance balance by automatically measuring the glacier surface ice and snow change. The measurement accuracy of the capacitive sensor for ice thickness can also reach ±4 mm and the capacitive sensor is of the potential for automatic monitoring the water level under the ice and the ice formation and development process in water. Such three new technologies can meet different needs of fixed-point ice thickness observation and realize the simultaneous measurement in order to accurately judge the ice thickness.

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Agricultural products moisture content measurement error estimation with the use of a four-element capacitive sensor model

IOP Conference Series Earth and Environmental Science ◽

10.1088/1755-1315/613/1/012161 ◽

2020 ◽

Vol 613 ◽

pp. 012161

Author(s):

I N Vorotnikov ◽

S V Mishukov ◽

I V Danchenko ◽

G V Masyutina

Keyword(s):

Measurement Error ◽

Moisture Content ◽

Error Estimation ◽

Capacitive Sensor ◽

Agricultural Products ◽

Sensor Model ◽

Content Measurement ◽

Moisture Content Measurement

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Nanoprecision MEMS Capacitive Sensor for Linear and Rotational Positioning

Journal of Microelectromechanical Systems ◽

10.1109/jmems.2009.2016275 ◽

2009 ◽

Vol 18 (3) ◽

pp. 660-670 ◽

Cited By ~ 46

Author(s):

Ju-Il Lee ◽

Xinghui Huang ◽

P.B. Chu

Keyword(s):

Capacitive Sensor

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A Pencil Drawn Capacitive Sensor used for Liquid Drug Volume Measurement in Syringe Pump

2020 IEEE Applied Signal Processing Conference (ASPCON) ◽

10.1109/aspcon49795.2020.9276687 ◽

2020 ◽

Author(s):

Subir Das ◽

Badal Chakraborty

Keyword(s):

Capacitive Sensor ◽

Volume Measurement ◽

Syringe Pump

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Device for online monitoring of insulation faults in high-voltage switchgears

International Journal of Distributed Sensor Networks ◽

10.1177/1550147721999284 ◽

2021 ◽

Vol 17 (2) ◽

pp. 155014772199928

Author(s):

Jiajia Song ◽

Jinbo Zhang ◽

Xinnan Fan

Keyword(s):

Fourier Transform ◽

High Voltage ◽

Online Monitoring ◽

Pulse Current ◽

Partial Discharge ◽

Current Method ◽

Capacitive Sensor ◽

Accurate Diagnosis ◽

Partial Discharges ◽

Urgent Problem

Partial discharges are the major cause of deterioration in the insulation characteristics of switchgears. Therefore, timely detection of partial discharge in switchgear and potential insulation faults is an urgent problem that needs to be addressed in the power supervision industry. In this study, a device was proposed for online monitoring of high-voltage switchgears based on pulse current method and ozone (O3) detection. The pulse current method obtains the PD signal by monitoring the phase holes on the switch indicator. Occurrence of a partial discharge in a certain phase leads to the production of a discharge pulse, which can be coupled out by a capacitive sensor. The current spectrum and the O3 produced by partial discharge were processed via fast Fourier transform for accurate diagnosis of the occurrence of partial discharge and its severity in switchgears. The proposed method allows for convenient acquisition of the partial discharge signal, simple installation of the device, and realization with inexpensive sensors.

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