Liquid level measurement system using capacitive sensor and optical sensor

Shim, Joonhwan

doi:10.5916/jkosme.2013.37.7.778

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…From Figure 14 , the maximum hysteresis error is 0.7% FSS, or 0.7 cm, when the actual liquid level is 63 cm. The reason for this hysteresis is the “flow-back phenomenon”: when the liquid level decreased, the water flow-back film was attached on electrode plate causing the hysteresis error [ 22 ].…”

Section: Experimental Demonstration and Discussionmentioning

confidence: 99%

Design and Implementation of an Intrinsically Safe Liquid-Level Sensor Using Coaxial Cable

Jin

Liu

Bai

et al. 2015

Sensors

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Real-time detection of liquid level in complex environments has always been a knotty issue. In this paper, an intrinsically safe liquid-level sensor system for flammable and explosive environments is designed and implemented. The poly vinyl chloride (PVC) coaxial cable is chosen as the sensing element and the measuring mechanism is analyzed. Then, the capacitance-to-voltage conversion circuit is designed and the expected output signal is achieved by adopting parameter optimization. Furthermore, the experimental platform of the liquid-level sensor system is constructed, which involves the entire process of measuring, converting, filtering, processing, visualizing and communicating. Additionally, the system is designed with characteristics of intrinsic safety by limiting the energy of the circuit to avoid or restrain the thermal effects and sparks. Finally, the approach of the piecewise linearization is adopted in order to improve the measuring accuracy by matching the appropriate calibration points. The test results demonstrate that over the measurement range of 1.0 m, the maximum nonlinearity error is 0.8% full-scale span (FSS), the maximum repeatability error is 0.5% FSS, and the maximum hysteresis error is reduced from 0.7% FSS to 0.5% FSS by applying software compensation algorithms.

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Section: Experimental Demonstration and Discussionmentioning

confidence: 99%

Design and Implementation of an Intrinsically Safe Liquid-Level Sensor Using Coaxial Cable

Jin

Liu

Bai

et al. 2015

Sensors

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show abstract

“…Different types of sensors have been proposed to measure the level of fuel in tanks, such as sensors based on ultrasonic Lamb waves [ 3 ], capacitive sensors [ 4 ], pressure sensors [ 5 ], and sensors based on optical fiber [ 6 , 7 ]. All these sensors work when a single type of liquid occupies the tank.…”

Section: Introductionmentioning

confidence: 99%

A Continuous Liquid-Level Sensor for Fuel Tanks Based on Surface Plasmon Resonance

Pozo

Pérez-Ocón

Rabaza

2016

Sensors

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A standard problem in large tanks at oil refineries and petrol stations is that water and fuel usually occupy the same tank. This is undesirable and causes problems such as corrosion in the tanks. Normally, the water level in tanks is unknown, with the problems that this entails. We propose herein a method based on surface plasmon resonance (SPR) to detect in real time the interfaces in a tank which can simultaneously contain water, gasoline (or diesel) and air. The plasmonic sensor is composed of a hemispherical glass prism, a magnesium fluoride layer, and a gold layer. We have optimized the structural parameters of the sensor from the theoretical modeling of the reflectance curve. The sensor detects water-fuel and fuel-air interfaces and measures the level of each liquid in real time. This sensor is recommended for inflammable liquids because inside the tank there are no electrical or electronic signals which could cause explosions. The sensor proposed has a sensitivity of between 1.2 and 3.5 RIU−1 and a resolution of between 5.7 × 10−4 and 16.5 × 10−4 RIU.

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Highly Accurate Water Level Measurement System Using a Microcontroller and an Ultrasonic Sensor

Mohammed

Al-Naji

Farjo

et al. 2019

IOP Conf. Ser.: Mater. Sci. Eng.

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In many conditions, the conventional liquid data monitoring based on an ultrasonic sensor provides the unreliable readings due to the dynamically changed water level. In addition, in some conditions, it needs not only measuring water level but also needs to measure the volume and control water surplus or deficiency. To solve these issues, this paper proposes an accurate non-contact water measurement system based on a microcontroller and an ultrasonic sensor to measure the level and volume of liquids in small tanks without any contact. The proposed system also provides automatically controlling the water level with an alarm system to provide early warning of water surplus or deficiency. Microcontroller PIC16F877A is used to drive the sensor circuit and measure the time change of the reflected echoes from the water surface received by the ultrasonic (PING) sensor that correspond to the changes in the water level. The experimental results illustrate the effectiveness of the proposed system to measure the level and volume of water over 30 cm range with small error rates (SSE = 0.033 cm, RMSE = 0.034 cm and MAE = 0.029 cm for level measurement and SSE = 0.025 liter, RMSE = 0.026 liter and MAE = 0.021 liter for volume measurement) and excellent correlation coefficients (SCC = 0.9997 and KCC = 0.9951), thus provide accurate results for continuous measurement of the water level and volume in industrial applications.

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Liquid level measurement system using capacitive sensor and optical sensor

Cited by 4 publications

References 6 publications

Design and Implementation of an Intrinsically Safe Liquid-Level Sensor Using Coaxial Cable

Design and Implementation of an Intrinsically Safe Liquid-Level Sensor Using Coaxial Cable

A Continuous Liquid-Level Sensor for Fuel Tanks Based on Surface Plasmon Resonance

Highly Accurate Water Level Measurement System Using a Microcontroller and an Ultrasonic Sensor

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