Author
T. Tapoanoi
Bio: T. Tapoanoi is an academic researcher. The author has contributed to research in topics: Capacitive sensing & Capacitance. The author has an hindex of 1, co-authored 1 publications receiving 105 citations.
Topics: Capacitive sensing, Capacitance
Papers
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TL;DR: A water level measurement using an interdigital capacitive sensor with low-cost, low-energy, good repeatability, high linearity, and ease of installation is proposed with a support of experimental results.
Abstract: A water level measurement using an interdigital capacitive sensor with low-cost, low-energy, good repeatability, high linearity, and ease of installation is proposed with a support of experimental results. This sensor comprises a printed circuit board (PCB) with configuration of two interpenetrating comb electrodes. The comb electrode is 70–80 mm width, 300 mm height with 1–2 mm spacing between each comb. This configuration of electrode causes the capacitance between comb electrodes to vary by the water level. Microcontroller is used to calculate the capacitance between comb electrodes in terms of a discharge time correlated to the water level. A practical water level measurement technique using two comb electrodes designated as level and reference sensors is presented. This technique can directly be applied to water with different conditions without recalibration. This sensor is able to measure absolute levels of water with 0.2 cm resolution over 30 cm range. In addition, it is also sensitive enough to trace the variability of water level. A flood monitoring simulation is carried out in wave flume where this sensor is used to detect the rising wave.
128 citations
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TL;DR: In this paper, a review of prior art on liquid level sensing is initially presented, and the operational characteristics and performance of a novel capacitive-type water level measurement system are investigated through simulations and experimental tests conducted in two water storage tanks of a city-scale water distribution network.
84 citations
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TL;DR: In this article, a review of pressure sensitivity enhancement methods that could be divided into two groups, namely intrinsic and extrinsic, is presented, for low hydrostatic pressure measurement.
Abstract: Fibre Bragg grating (FBG) pressure sensors show a great potential in replacing conventional electrical pressure sensors due to their numerous advantages. However, increasing their pressure sensitivity performance for low hydrostatic pressure measurement is still a challenge. This paper reviewed recent pressure sensitivity enhancement methods that could be divided into two groups, namely intrinsic and extrinsic. For the intrinsic enhancement method, this paper reviewed polymer FBGs, special fibre sensors, interferometric sensors, and special grating sensors. For the extrinsic enhancement method, polymer-based pressure transducers, diaphragm-based pressure transducers, and other structure-based pressure transducers were reviewed in detail.
78 citations
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TL;DR: In this paper, a liquid-level measurement system based on a grounded cylindrical capacitive sensor for conductive liquids is presented, where the inner conductor of the shielded cable is connected to ground and the outer conductor is used to measure the liquid level.
Abstract: This paper presents the design and fabrication of a liquid-level measurement system based on a grounded cylindrical capacitive sensor for conductive liquids. Fabrication of the cylindrical capacitive sensor is performed with a novel approach of shielded cable. The inner conductor of shielded cable is connected to ground and the outer conductor is used to measure the liquid level. The relationship between the capacitance value of the cylindrical capacitive sensor and the liquid level is deduced by the analysis and calculation of physical parameters. Moreover, a backward difference calculation is adopted in order to offset the effects of the parasitic capacitance. The performance of the system has been experimentally tested in both grounded metallic and plastic containers. The experimental results show that the nonlinear error is smaller than 5 mm over a range of 90 cm. Over a wide measuring range of 200 cm, the liquid-level measurement system has a nonlinear error smaller than 1.35 cm.
60 citations
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TL;DR: A simulation method of ultrasonic echo signal from liquid level based on the boundary-layer theory and the ultrasonic scattering theory is proposed, and it is indicated that the good performance of the proposed method remains, provided that the focus in beamforming is properly set in every scanning direction and the noise of echo signal is effectively controlled.
Abstract: In many circumstances, the conventional ultrasonic liquid-level detection presents the unreliable estimations due to the dynamically changed liquid level. In addition, there are circumstances where the level change involves not only the fluctuation but also the rise or fall of liquid level. To improve the measuring accuracy of liquid level using the ultrasonic method in dynamically changed level case, an attractive ultrasonic method, named the liquid-level detection based on the multiple-input multiple-output ultrasonic transducer array, is proposed in this paper. This method is different from the early ultrasonic liquid-level detections, including those that utilize transducer array. Based on the virtual element technology, the method employs the multitransducer array to achieve the reduction of system complexity and cost, and then applies the synthetic aperture technology to realize rapid samples of liquid level. Besides, one adaptive searching scheme of focused position in beamforming of synthetic aperture in each scanning direction is optimized to get the high precise samples of liquid level. The proposed method is verified by simulation and a real system, and compared with the conventional single-channel approach. We still proposed a simulation method of ultrasonic echo signal from liquid level based on the boundary-layer theory and the ultrasonic scattering theory. The simulated and actual measurement results demonstrate that the proposed method is obviously superior to the conventional approach. Meanwhile, the factors influencing on the proposed method are investigated by simulation also. The investigations reveal that the focus position in beamforming, the SNR of echo signal, and the wave size of liquid level have impact on the suggested method. However, it is indicated that the good performance of the proposed method remains, provided that the focus in beamforming is properly set in every scanning direction and the noise of echo signal is effectively controlled.
57 citations
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TL;DR: A low-cost capacitive sensing device for liquid-level measurement is presented in this article, where a novel comb, such as pattern of electrode, is proposed, and the measurement results show a variation error of about 6%.
Abstract: A low-cost capacitive sensing device for liquid-level measurement is presented in this letter. We proposed a novel comb, such as pattern of electrode. An equivalent capacitor can be formed by the electrode and the liquid within the container, and the equivalent capacitance will be proportional to the area of the electrode. Therefore, when the liquid-level position reaches a larger area of the comb electrode, the equivalent capacitance will have significant gradient changes. The measurement results show a variation error of about 6%. The comb-electrode offers simple, effective, and accurate advantages without any additional calibration. This comb-electrode is easily to be applied to a non-intrusive monitoring system which can be found in various places around biomedical applications.
52 citations