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

In this study, a semi cylindrical capacitive array type liquid interface level measuring sensor is described. The sensor consists of a continuous large semi cylindrical thin metallic plate acting as a common plate of the capacitor and an array of small semi cylindrical thin metallic plates, separated by very small gap distance. All plates are mounted along the outer wall of a cylindrical non conducting vertical storage tank. The detection of liquid interface is based on the measurement of capacitance of the array of plates which varies with the dielectric constant of the liquid within the tank. The measured capacitance has been obtained in nano farad range. Since the sensor is non contact type, it can be used for both conducting and non conducting type of liquid contained within a non conducting tank. Experimental results confirm the satisfactory performance of the sensor for liquid interface level measurement.

[1]  Aimé Lay-Ekuakille.  Advanced Instrument Engineering: Measurement, Calibration, and Design , 2013 .

[2]  Wuqiang Yang,et al.  Multi-interface Level Sensors and New Development in Monitoring and Control of Oil Separators , 2006, Sensors (Basel, Switzerland).

[3]  Subrata Chattopadhyay,et al.  A low-cost noncontact capacitance-type level transducer for a conducting liquid , 2006, IEEE Transactions on Instrumentation and Measurement.

[4]  Cheng-Ta Chiang,et al.  A Semicylindrical Capacitive Sensor With Interface Circuit Used for Flow Rate Measurement , 2006, IEEE Sensors Journal.

[5]  David A. Banks,et al.  Audience Response Systems in Higher Education: Applications and Cases. , 2006 .

[6]  Karen Barton,et al.  Online Assessment and Instruction Using Learning Maps: A Glimpse into the Future , 2008 .

[7]  Khalifa,et al.  A non-contact capacitance type level transducer for liquid characterization , 2008, 2008 International Conference on Computer and Communication Engineering.

[8]  Cheng-Ta Chiang,et al.  A Semi-Cylindrical Capacitive Sensor with Signal Conditioner for Flow Meter Applications , 2006, 2006 5th IEEE Conference on Sensors.

[9]  Valnei Smarçaro da Cunha,et al.  Developments of Environmental Certified Reference Material from the Brazilian Metrology Institute to Support National Traceability , 2013, Int. J. Meas. Technol. Instrum. Eng..

[10]  A. Jaworek,et al.  Gas/liquid ratio measurements by rf resonance capacitance sensor , 2004 .

[11]  Larry K. Baxter,et al.  Capacitive Sensors: Design and Applications , 1996 .

[12]  Georg Brasseur.  Design rules for robust capacitive sensors , 2003, IEEE Trans. Instrum. Meas..

[13]  N. White,et al.  Dual-modality probe for characterization of heterogeneous mixtures , 2005, IEEE Sensors Journal.

[14]  Flora Malamateniou,et al.  An Android-Enabled PHR-based System for the Provision of Homecare Services , 2013, Int. J. Meas. Technol. Instrum. Eng..

[15]  Scott L. Howell,et al.  Online Assessment, Measurement and Evaluation: Emerging Practices. , 2006 .

[16]  Eun G. Park.  Survey Tracker E-Mail/ Web Survey Software , 2007 .

[17]  Alessandro Massaro,et al.  An Observation on Least Action Principle in Classical Mechanics Oriented on the Evaluation of Relativistic Error Concerning the Measurements of Light Propagating in a Liquid , 2011, Int. J. Meas. Technol. Instrum. Eng..

[18]  Carol B. MacKnight.  Handbook of research on electronic surveys and measurements , 2008 .

[19]  Matteo Cacciola,et al.  About Processing of Exponentially Damped Signals: A Hardware for Biomedical Applications , 2012, Int. J. Meas. Technol. Instrum. Eng..

[20]  Hao Hu,et al.  A new-type sensor for monitoring oil-water interface level and oil level , 2009, 2009 9th International Conference on Electronic Measurement & Instruments.

[21]  A. Thomsen,et al.  Application of TDR to water level measurement , 2000 .

[22]  Gerard C. M. Meijer,et al.  Liquid-level measurement system based on a remote grounded capacitive sensor , 2007 .

[23]  Cheng-Ta Chiang,et al.  A Semi-Cylindrical Capacitive Sensor with Interface Circuit using for Fluidic Measuring , 2006, 2006 IEEE Instrumentation and Measurement Technology Conference Proceedings.

[24]  Roman Malaric,et al.  Internet-Enabled Calibration: A Future of Calibration? , 2011, Int. J. Meas. Technol. Instrum. Eng..

[25]  R. Kearney,et al.  Proportional Microvolume Capacitive Liquid Level Sensor Array , 2005, 2005 IEEE Engineering in Medicine and Biology 27th Annual Conference.

[26]  C. P. Nemarich.  Time domain reflectometry liquid level sensors , 2001 .

[27]  BhatejaVikrant,et al.  A Non-Linear Approach to ECG Signal Processing using Morphological Filters , 2013 .

[28]  Aimé Lay-Ekuakille,et al.  Measurements and Characterization of Photovoltaic Modules for Tolerance Verification , 2011, Int. J. Meas. Technol. Instrum. Eng..