Design, Development and Testing of a Semi Cylindrical Capacitive Array Type Liquid Interface Level Sensor

Pal, Sagarika; Mukherjee, Ramtanu; Ganguly, Sharmi

doi:10.4018/978-1-4666-4165-5.ch018

Cited by 5 publications

(6 citation statements)

References 14 publications

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“…The sinusoidal transfer function of SCC is V 0 (jω) / V in (jω) = -R f / (1/jω C s ) = -jωR f C s (2) As a consequence, magnitude of the gain of C-V converter is given by ωR f C s which leads to an advantage that the gain increases at a rate of +20dB/decade with respect to the capacitance offered by the sensor. As the transfer function is having a 'zero' at the origin, it leads to few constraints that the circuit may become unstable at high frequency and also sensitive to noise because the input impedance (1/ωC s) decreases with the increase in frequency.…”

Section: Design and Fabrication Of Sensormentioning

confidence: 99%

“…The optical sensors (fiber optics, γrays), ultrasonic sensors etc. belonging to the non-contact type liquid-level measurement methods as in [1][2][3][4][5][6] are not suitable for measuring liquid level through a container without contacting the liquid. Further, these are very complex and expensive because of their associated electronic circuit.…”

Section: Introductionmentioning

confidence: 99%

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Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Babu¹,

Manohar

2014

International Conference on Circuits, Communication, Control and Computing

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A novel technique to design a reliable signal conditioning circuit (SCC) for self-compensating capacitive sensor meant for multi threshold liquid level measurements is presented in this paper. The non-contact type sensor for the measurement and control of liquid level is the key to avoid the corrosion of contact sensors due to chemicals and the usage of compensation system. The proposed capacitive, non-contact type sensor employs self-compensation technique whose output is of the order of Pico Farads, which is difficult to process for further control action. To overcome this, it is proposed here to design a reliable and precise signal conditioning circuit. Also, an efficient SCC is developed using Linear OPAMP. Experimental results reveal that the resolution of measurement of liquid level is improved with respect to electrode dimensions and the designed SCC converts the low capacitance output in a significant manner.

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Section: Design and Fabrication Of Sensormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Babu¹,

Manohar

2014

International Conference on Circuits, Communication, Control and Computing

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“…Analysis of capacitive liquid level sensor characteristics for fuel measurement in a level control process used in the upper-stage rocket system is reported in [3]. Design and development of semicylindrical capacitor for measurement of liquid level is reported in [4]. In [5], the principle of variation in conductivity of an electrode with variation in liquid level is used for measurement of liquid.…”

Section: Introductionmentioning

confidence: 99%

Design of an Instrument for Liquid Level Measurement and Concentration Analysis Using Multisensor Data Fusion

2020

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This paper presents the design of an instrument for measuring the liquid level. The objective of this proposed work is to measure the level of liquid accurately even with variations in liquid concentration. The designed instrument should also be able to compute the concentration of additives in the liquid. For this purpose, a multisensor model comprising a capacitive level sensor (CLS), ultrasonic level sensor (ULS), and capacitance pressure sensor is used to acquire information of the liquid. The data acquired from all these sensors are processed using Pau’s multisensor data fusion framework to compute the level of liquid along with the concentration of additives added to the solution. Pau’s framework consists of alignment, association function, analysis, and representation functions. The designed multisensor technique is tested with real-life data for varying liquid levels and additives. The results obtained show that the successful implementation of the proposed objective producing a root mean square of percentage error is 1.1% over the full scale is possible.

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“…Several studies have been carried out around the use of capacitors in the manufacture of chemical sensors based on the field effect, searching more compact dimensional characteristics and more precise experimental resources [7][8][9]. Murugarajan and Samuel [10] used a high-resolution capacitive sensor for mesoscale dimensional characterization.…”

Section: Introductionmentioning

confidence: 99%

“…Liquid level is an important variable on the measurement and control of industrial processes. It can be detected by various methods, such as the float, ultrasonic, differential pressure optical, and capacitive methods [8,9]. For any control system using a control loop, a sensor…”

Section: Introductionmentioning

confidence: 99%

Design, development and application of a real-time capacitive sensor for automatically measuring liquid level

Bento

Silva²,

Dias³

et al. 2019

SN Appl. Sci.

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In the present study a real-time capacitive sensor based on a capacitance step method is designed, developed and applied on measuring the liquid level by immersion. The capacitive sensor consists of two electrodes from copper plated phenolite plates separated by a gap distance and mounted inside a non-conductive storage tank. Water is used as the dielectric material. The analyzed sensor behavior with liquid level variation is semi-linear and obtained in function of the output voltage variation by using proper signal conditioning circuit. For converting the voltage variation into level variation, a parallel R-C circuit is used instead of conventional bridge circuit. Under suitable parameter settings it provided good reading accuracy. The experimental results demonstrate the high efficiency of the proposed model, which confirm the satisfactory performance of the capacitive sensor for liquid level measurement. The sensor presents an excellent ease of construction and installation, linked to the good measurements precision and high autonomy of system operation. The behavior experiments under different salt concentrations show that the water chemical composition does not interfere on the sensor operation. The proposed model exhibits a promising employment in several applications, such as control equipment for irrigation, biomedical area-in the interaction between antibody-antigen or protein-DNA, aerospace and pharmaceutical industry, gas sensors, and automation solutions.

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Design, Development and Testing of a Semi Cylindrical Capacitive Array Type Liquid Interface Level Sensor

Cited by 5 publications

References 14 publications

Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Design of a low cost signal conditioning circuit for self-compensated non contact capacitive type multi threshold liquid level sensor

Design of an Instrument for Liquid Level Measurement and Concentration Analysis Using Multisensor Data Fusion

Design, development and application of a real-time capacitive sensor for automatically measuring liquid level

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