A capacitance level sensor design and sensor signal enhancement

Li, Yuting; Chao, Chih-Ming; Wang, Kerwin

doi:10.1109/nems.2011.6017486

Cited by 9 publications

(4 citation statements)

References 11 publications

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“…Many researchers have developed interdigitated capacitive sensors (or coplanar capacitive sensors) which work on the principle of fringing field. Li et al in [17] developed a new fringing field capacitive sensor. Fringing field is a result of non-ideal obeyance of boundary conditions.…”

Section: Capacitive Sensors -Coplanar Geometrymentioning

confidence: 99%

“…Hence fringing field is non-linearly related to the total capacitance of a sensor. The proposed sensor in [17] exploits this fringing electric field, which depends on the dimensions of the pores and density of pores (measured per unit area). Choosing optimal pore structure is the key to improve the capacitance of the sensor.…”

Section: Capacitive Sensors -Coplanar Geometrymentioning

confidence: 99%

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A Review on Capacitive Liquid Level Sensing Techniques

S¹,

Roopa²,

Harigovind³

et al. 2021

JUSST

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For contemporary communities, liquid-level management is of great significance. Liquid-level monitoring is utilized in a variety of industrial applications, including food processing, pharmaceutical manufacturing, chemical manufacturing, and water purification systems. Liquids are used in critical applications such as rocket fuel tanks, medical equipment, etc. These systems are prone to accidents caused by liquid leakages and liquid turbulence. Hence it is necessary to prevent such mishaps and save resources and additional costs which are incurred due to the same. This necessitates the design and development of liquid-level sensing systems that are used to detect and monitor the level of liquid. There are many techniques that can be used to sense the level of liquid-like mechanical floats, ultrasonic sensors, fibre optic cables, LASER systems, light dependant resistors, image processing, etc. Capacitive sensing has emerged as one of the booming technologies due to its simplistic design, responsiveness, accuracy, noise immunity, and easy deployment. It has evolved over time and is now a vital feature of a variety of products. This paper aims to review the existing capacitive sensing mechanisms and attempts to serve as a foundation for unexplored sensor geometries. A comparative analysis has been presented to assess the performance of the proposed techniques. Coplanar capacitive sensors are found to be effective over cylindrical capacitive sensors due to a decrease in size, simple design, and cost-effectiveness while maintaining the same accuracy, resolution and sensitivity.

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Section: Capacitive Sensors -Coplanar Geometrymentioning

confidence: 99%

Section: Capacitive Sensors -Coplanar Geometrymentioning

confidence: 99%

A Review on Capacitive Liquid Level Sensing Techniques

S¹,

Roopa²,

Harigovind³

et al. 2021

JUSST

View full text Add to dashboard Cite

show abstract

“…Many of the applications of this type of sensor involve direct contact with moisture [3][4][5][6][7][8][9][10][11]. If the electrode arrays are not coated with a thin nonconducting layer, the high conductivity of water would effectively short the electrodes.…”

Section: B Air and Water Immersion Testsmentioning

confidence: 99%

“…Additionally, this type of sensor has been used to measure the moisture content of objects and materials, such as soil [5], paper pulp [6], grain [7], wood [8], and animal hides [9]. Other applications include the measurement of water level [10], environmental parameters [11], and pH [12], and as biosensors for meat inspection [13].…”

Section: Introductionmentioning

confidence: 99%

Capacitive Fringing Field Moisture Sensors Implemented in Flexible Printed Circuit Board Technology

Dean¹,

Hamilton²,

Baginski³

2014

Journal of Microelectronics and Electronic Packaging

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AbstractÀCapacitive fringing field sensors are often used in applications where moisture is detected, since the dielectric constant of liquid water is approximately 80 times greater than the dielectric constant of air. Most of these sensors, however, are realized using rigid substrates. Some applications would benefit from using a flexible capacitive fringing field sensor that could be conformally mounted on a nonplanar surface. Flexible printed circuit board technology is a mature commercially available process for manufacturing flexible electronics. This same technology can also be used to realize flexible fringing field moisture sensors where the patterned Cu foil is used for the electrodes and the soldermask coating electrically insulates the electrodes from being electrically shorted by moisture in the detection environment. Sensors were designed and characterized through flat and bending tests in air and in water. The tests demonstrated that bending a sensor over a radius of curvature as small as 13.7 mm had no measurable impact on sensor performance in air or in water. The sensors achieved a 3:1 increase in capacitance when immersed in water compared with in air.

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