Fringing Field Capacitance Sensor for Measuring the Moisture Content of Agricultural Commodities

McIntosh, Robert; Casada, Mark E.

doi:10.1109/jsen.2007.913140

Cited by 65 publications

(22 citation statements)

References 7 publications

(10 reference statements)

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“…As an important sensing application, with the use of different polymer film coating on FBGs, FBG sensors can be taken as the fiber humidity sensor to use in biomedical and food industrial fields for measurements of the humidity in the environment and water contents in some materials. [3][4][5] Compared with traditional electric humidity sensors which are based on changes of the electrical resistivity or the capacitance of materials 6 and connected to the instruments with short-length electrical wires, FBG sensors, without the electrical driving and with immunity to electromagnetic interference, can be applied in a harsh environment, such as high-voltage transformers and the chemical plants with many flammable and explosive materials and achieve the remote measurements up to several kilometer distances.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on humidity sensing using a FBG sensor with polyimide coating

et al. 2010

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Experimental studies on humidity measurements by using a FBG-based humidity sensor with multi-layer polyimide coating are demonstrated. As an important sensing application, the FBG humidity sensors have many unique advantages, such as immunity to electromagnetic interference and compact size, over the conventional electrical humidity sensor. In the detection principle, The Bragg wavelength of the FBG sensor shifts with the volume of the moisture absorbed by the polyimide film coated on the FBG. Experimental results show a good linear relationship between the shifts of the Bragg wavelength of FBG sensor and the changes in the relative humidity level. The preliminary experiments for investigating the performances of this polyimide-coating FBG humidity sensor were carried out and several experimental results in measurements of the relative humidity in air and moisture in oil are presented.

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Section: Introductionmentioning

confidence: 99%

Experimental study on humidity sensing using a FBG sensor with polyimide coating

et al. 2010

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“…Non-contact measurements with FEF sensors provide reliable information about material’s characteristic and property [12]. Due to possessing these features, the FEF sensor is used in many fields, for example, for soil moisture measurement, making changes in a material’s dielectrics, in motion sensors, to improve a material’s properties and to measure the moisture content of agricultural commodities [13,14,15]. The FEF sensors’ performance is largely impacted by their penetration depth, signal strength, measurement sensitivity and linearity, which are determined by factors such as sensor’s pattern, area and geometrical parameters [16].…”

Section: Theory Of a Fringing Electric Field Sensormentioning

confidence: 99%

Fringing Electric Field Sensors for Anti-Attack at System-Level Protection

Gao

Zhao

2018

Sensors

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Information system security has been in the spotlight of individuals and governments in recent years. Integrated Circuits (ICs) function as the basic element of communication and information spreading, therefore they have become an important target for attackers. From this perspective, system-level protection to keep chips from being attacked is of vital importance. This paper proposes a novel method based on a fringing electric field (FEF) sensor to detect whether chips are dismantled from a printed circuit board (PCB) as system-level protection. The proposed method overcomes the shortcomings of existing techniques that can be only used in specific fields. After detecting a chip being dismantled from PCB, some protective measures like deleting key data can be implemented to be against attacking. Fringing electric field sensors are analyzed through simulation. By optimizing sensor’s patterns, areas and geometrical parameters, the methods that maximize sensitivity of fringing electric field sensors are put forward and illustrated. The simulation is also reproduced by an experiment to ensure that the method is feasible and reliable. The results of experiments are inspiring in that they prove that the sensor can work well for protection of chips and has the advantage of universal applicability, low cost and high reliability.

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“…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%

“…In particular, this type of sensor has been used in sensing the presence of water, present in either vapor (humidity) [2], liquid (moisture) [3], or solid (ice) [4] form. 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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Fringing Field Capacitance Sensor for Measuring the Moisture Content of Agricultural Commodities

Cited by 65 publications

References 7 publications

Experimental study on humidity sensing using a FBG sensor with polyimide coating

Experimental study on humidity sensing using a FBG sensor with polyimide coating

Fringing Electric Field Sensors for Anti-Attack at System-Level Protection

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

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