A planar capacitive precision gauge for liquid-level and leakage detection

Toth, F.N.; Meijer, G.C.M.; Lee, M. van der

doi:10.1109/19.572052

Cited by 60 publications

(24 citation statements)

References 4 publications

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“…A common type of capacitive sensor is based on a coplanar-plate capacitor [19]. These sensors are made up of two elongated conductive blades placed in parallel, at a distance d of each other (see Figure 1).…”

Section: Methodsmentioning

confidence: 99%

An Automatic Critical Care Urine Meter

Otero

Fernández

Apalkov

et al. 2012

Sensors

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Nowadays patients admitted to critical care units have most of their physiological parameters measured automatically by sophisticated commercial monitoring devices. More often than not, these devices supervise whether the values of the parameters they measure lie within a pre-established range, and issue warning of deviations from this range by triggering alarms. The automation of measuring and supervising tasks not only discharges the healthcare staff of a considerable workload but also avoids human errors in these repetitive and monotonous tasks. Arguably, the most relevant physiological parameter that is still measured and supervised manually by critical care unit staff is urine output (UO). In this paper we present a patent-pending device that provides continuous and accurate measurements of patient's UO. The device uses capacitive sensors to take continuous measurements of the height of the column of liquid accumulated in two chambers that make up a plastic container. The first chamber, where the urine inputs, has a small volume. Once it has been filled it overflows into a second bigger chamber. The first chamber provides accurate UO measures of patients whose UO has to be closely supervised, while the second one avoids the need for frequent interventions by the nursing staff to empty the container.

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Section: Methodsmentioning

confidence: 99%

An Automatic Critical Care Urine Meter

Otero

Fernández

Apalkov

et al. 2012

Sensors

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“…Compared to traditional water level sensors, optical sensors have unique advantages, such as the ability to provide measurements in non-conducting liquids, real-time remote monitoring, electromagnetic immunity, compact size, and multi-parameter sensing [4]. Both noncontact and contact sensing methods are available for optical water level sensing.…”

Section: Introductionmentioning

confidence: 98%

Fiber optic sensing system for in-situ simultaneous monitoring of water stage, quality, and temperature

Huang

2014

SPIE Proceedings

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To accurately track the water stage changes and environmental influences on water quality and have sufficient follow-ups to prevent potential flood and environmental hazards, an in-situ continuous monitoring system for water stage and quality is helpful. Traditional in-situ water-stage monitoring system has relative low accuracy and require separate sensors for water quality and temperature which complex the evaluation. Advanced optical fiber sensors, with unique features of real-time and multiparameter sensing capacity, could provide potential simultaneous evaluation of flooding, water-quality deterioration, and science-based decision support. In this study, an in-situ monitoring system for water stage, overall water quality, and temperature is developed using long-period fiber grating (LPFG) sensors. When part of the LPFG sensor is submerged in water, the resonant wavelength of each cladding mode of the LPFG sensor varies linearly with the submerged length (refer to water stage) and temperature, and nonlinearly with refractive index changes (referred to the water quality). Two resonant wavelengths were used to relate the water stage and overall water quality to the change in resonant wavelengths of the LPFG sensor. Sharing the same fiber line, one sequential glass packaged LPFG was used to monitor the temperature changes at the same location. The algorithm for simultaneous determination of the water stage, overall water quality, and temperature was analytically formulated and experimentally validated. Benefit from the multi-parameter sensing using one single fiber line, the developed optical sensing network can potentially provide a low-cost, real-time, and high resolution solution for the in-situ water quality monitoring.

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“…Toth et al 12 describe the design of a precision capacitive sensor using a capacitance-controlled oscillator and a microcontroller. The authors report that the liquid level could be measured to an accuracy of 1 mm over a 4-m range, with a resolution of 0.1 mm using their technique.…”

Section: Introductionmentioning

confidence: 99%

Development of a low-cost educational liquid-level sensor circuit

İbrahim

2015

International Journal of Electrical Engineering & Education

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In this article, the design of a low-cost educational liquid-level sensor circuit is described. The sensor is of capacitive type and is in the form of a parallel plate capacitor made up of two aluminium foil papers stuck on opposite sides of the container whose liquid level is to be measured. The sensor works on the principle that its capacitance changes with the level of liquid in the container as a result of the change in permittivity between the plates. Thus, by calculating the capacitor value, one can calculate the level of the liquid in the vessel. In this article, the capacitor value is calculated using a microcontroller-based circuit where an RC circuit is formed and the rise-time of the voltage across the capacitor is measured and is then related to the level of the liquid. The results are found to have good linearity and repeatability, and it is shown that the liquid level can be measured accurately and with low cost using some readily available basic components.

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A planar capacitive precision gauge for liquid-level and leakage detection

Cited by 60 publications

References 4 publications

An Automatic Critical Care Urine Meter

An Automatic Critical Care Urine Meter

Fiber optic sensing system for in-situ simultaneous monitoring of water stage, quality, and temperature

Development of a low-cost educational liquid-level sensor circuit

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