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Volume 123, Issue 12, December 2010

www.sensorsportal.com ISSN 1726-5479

Editors-in-Chief: professor Sergey Y. Yurish, tel.: +34 696067716, fax: +34 93 4011989, e-mail: [email protected]

Editors for Western Europe Meijer, Gerard C.M., Delft University of Technology, The Netherlands Ferrari, Vittorio, Universitá di Brescia, Italy

Editor South America Costa-Felix, Rodrigo, Inmetro, Brazil

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Editors for North America Datskos, Panos G., Oak Ridge National Laboratory, USA Fabien, J. Josse, Marquette University, USA Katz, Evgeny, Clarkson University, USA

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Editor for Asia-Pacific Mukhopadhyay, Subhas, Massey University, New Zealand

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Abdul Rahim, Ruzairi, Universiti Teknologi, Malaysia Ahmad, Mohd Noor, Nothern University of Engineering, Malaysia Annamalai, Karthigeyan, National Institute of Advanced Industrial Science and

Technology, Japan Arcega, Francisco, University of Zaragoza, Spain Arguel, Philippe, CNRS, France Ahn, Jae-Pyoung, Korea Institute of Science and Technology, Korea Arndt, Michael, Robert Bosch GmbH, Germany Ascoli, Giorgio, George Mason University, USA Atalay, Selcuk, Inonu University, Turkey Atghiaee, Ahmad, University of Tehran, Iran Augutis, Vygantas, Kaunas University of Technology, Lithuania Avachit, Patil Lalchand, North Maharashtra University, India Ayesh, Aladdin, De Montfort University, UK Bahreyni, Behraad, University of Manitoba, Canada Baliga, Shankar, B., General Monitors Transnational, USA Baoxian, Ye, Zhengzhou University, China Barford, Lee, Agilent Laboratories, USA Barlingay, Ravindra, RF Arrays Systems, India Basu, Sukumar, Jadavpur University, India Beck, Stephen, University of Sheffield, UK Ben Bouzid, Sihem, Institut National de Recherche Scientifique, Tunisia Benachaiba, Chellali, Universitaire de Bechar, Algeria Binnie, T. David, Napier University, UK Bischoff, Gerlinde, Inst. Analytical Chemistry, Germany Bodas, Dhananjay, IMTEK, Germany Borges Carval, Nuno, Universidade de Aveiro, Portugal Bousbia-Salah, Mounir, University of Annaba, Algeria Bouvet, Marcel, CNRS – UPMC, France Brudzewski, Kazimierz, Warsaw University of Technology, Poland Cai, Chenxin, Nanjing Normal University, China Cai, Qingyun, Hunan University, China Campanella, Luigi, University La Sapienza, Italy Carvalho, Vitor, Minho University, Portugal Cecelja, Franjo, Brunel University, London, UK Cerda Belmonte, Judith, Imperial College London, UK Chakrabarty, Chandan Kumar, Universiti Tenaga Nasional, Malaysia Chakravorty, Dipankar, Association for the Cultivation of Science, India Changhai, Ru, Harbin Engineering University, China Chaudhari, Gajanan, Shri Shivaji Science College, India Chavali, Murthy, N.I. Center for Higher Education, (N.I. University), India Chen, Jiming, Zhejiang University, China Chen, Rongshun, National Tsing Hua University, Taiwan Cheng, Kuo-Sheng, National Cheng Kung University, Taiwan Chiang, Jeffrey (Cheng-Ta), Industrial Technol. Research Institute, Taiwan Chiriac, Horia, National Institute of Research and Development, Romania Chowdhuri, Arijit, University of Delhi, India Chung, Wen-Yaw, Chung Yuan Christian University, Taiwan Corres, Jesus, Universidad Publica de Navarra, Spain Cortes, Camilo A., Universidad Nacional de Colombia, Colombia Courtois, Christian, Universite de Valenciennes, France Cusano, Andrea, University of Sannio, Italy D'Amico, Arnaldo, Università di Tor Vergata, Italy De Stefano, Luca, Institute for Microelectronics and Microsystem, Italy Deshmukh, Kiran, Shri Shivaji Mahavidyalaya, Barshi, India Dickert, Franz L., Vienna University, Austria Dieguez, Angel, University of Barcelona, Spain Dimitropoulos, Panos, University of Thessaly, Greece Ding, Jianning, Jiangsu Polytechnic University, China Djordjevich, Alexandar, City University of Hong Kong, Hong Kong Donato, Nicola, University of Messina, Italy Donato, Patricio, Universidad de Mar del Plata, Argentina

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Italy Francis, Laurent, University Catholique de Louvain, Belgium Fu, Weiling, South-Western Hospital, Chongqing, China Gaura, Elena, Coventry University, UK Geng, Yanfeng, China University of Petroleum, China Gole, James, Georgia Institute of Technology, USA Gong, Hao, National University of Singapore, Singapore Gonzalez de la Rosa, Juan Jose, University of Cadiz, Spain Granel, Annette, Goteborg University, Sweden Graff, Mason, The University of Texas at Arlington, USA Guan, Shan, Eastman Kodak, USA Guillet, Bruno, University of Caen, France Guo, Zhen, New Jersey Institute of Technology, USA Gupta, Narendra Kumar, Napier University, UK Hadjiloucas, Sillas, The University of Reading, UK Haider, Mohammad R., Sonoma State University, USA Hashsham, Syed, Michigan State University, USA Hasni, Abdelhafid, Bechar University, Algeria Hernandez, Alvaro, University of Alcala, Spain Hernandez, Wilmar, Universidad Politecnica de Madrid, Spain Homentcovschi, Dorel, SUNY Binghamton, USA Horstman, Tom, U.S. Automation Group, LLC, USA Hsiai, Tzung (John), University of Southern California, USA Huang, Jeng-Sheng, Chung Yuan Christian University, Taiwan Huang, Star, National Tsing Hua University, Taiwan Huang, Wei, PSG Design Center, USA Hui, David, University of New Orleans, USA Jaffrezic-Renault, Nicole, Ecole Centrale de Lyon, France Jaime Calvo-Galleg, Jaime, Universidad de Salamanca, Spain James, Daniel, Griffith University, Australia Janting, Jakob, DELTA Danish Electronics, Denmark Jiang, Liudi, University of Southampton, UK Jiang, Wei, University of Virginia, USA Jiao, Zheng, Shanghai University, China John, Joachim, IMEC, Belgium Kalach, Andrew, Voronezh Institute of Ministry of Interior, Russia Kang, Moonho, Sunmoon University, Korea South Kaniusas, Eugenijus, Vienna University of Technology, Austria Katake, Anup, Texas A&M University, USA Kausel, Wilfried, University of Music, Vienna, Austria Kavasoglu, Nese, Mugla University, Turkey Ke, Cathy, Tyndall National Institute, Ireland Khelfaoui, Rachid, Université de Bechar, Algeria Khan, Asif, Aligarh Muslim University, Aligarh, India Kim, Min Young, Kyungpook National University, Korea South Ko, Sang Choon, Electronics. and Telecom. Research Inst., Korea South Kockar, Hakan, Balikesir University, Turkey Kotulska, Malgorzata, Wroclaw University of Technology, Poland Kratz, Henrik, Uppsala University, Sweden Kumar, Arun, University of South Florida, USA

Kumar, Subodh, National Physical Laboratory, India Kung, Chih-Hsien, Chang-Jung Christian University, Taiwan Lacnjevac, Caslav, University of Belgrade, Serbia Lay-Ekuakille, Aime, University of Lecce, Italy Lee, Jang Myung, Pusan National University, Korea South Lee, Jun Su, Amkor Technology, Inc. South Korea Lei, Hua, National Starch and Chemical Company, USA Li, Genxi, Nanjing University, China Li, Hui, Shanghai Jiaotong University, China Li, Xian-Fang, Central South University, China Liang, Yuanchang, University of Washington, USA Liawruangrath, Saisunee, Chiang Mai University, Thailand Liew, Kim Meow, City University of Hong Kong, Hong Kong Lin, Hermann, National Kaohsiung University, Taiwan Lin, Paul, Cleveland State University, USA Linderholm, Pontus, EPFL - Microsystems Laboratory, Switzerland Liu, Aihua, University of Oklahoma, USA Liu Changgeng, Louisiana State University, USA Liu, Cheng-Hsien, National Tsing Hua University, Taiwan Liu, Songqin, Southeast University, China Lodeiro, Carlos, University of Vigo, Spain Lorenzo, Maria Encarnacio, Universidad Autonoma de Madrid, Spain Lukaszewicz, Jerzy Pawel, Nicholas Copernicus University, Poland Ma, Zhanfang, Northeast Normal University, China Majstorovic, Vidosav, University of Belgrade, Serbia Marquez, Alfredo, Centro de Investigacion en Materiales Avanzados, Mexico Matay, Ladislav, Slovak Academy of Sciences, Slovakia Mathur, Prafull, National Physical Laboratory, India Maurya, D.K., Institute of Materials Research and Engineering, Singapore Mekid, Samir, University of Manchester, UK Melnyk, Ivan, Photon Control Inc., Canada Mendes, Paulo, University of Minho, Portugal Mennell, Julie, Northumbria University, UK Mi, Bin, Boston Scientific Corporation, USA Minas, Graca, University of Minho, Portugal Moghavvemi, Mahmoud, University of Malaya, Malaysia Mohammadi, Mohammad-Reza, University of Cambridge, UK Molina Flores, Esteban, Benemérita Universidad Autónoma de Puebla, Mexico Moradi, Majid, University of Kerman, Iran Morello, Rosario, University "Mediterranea" of Reggio Calabria, Italy Mounir, Ben Ali, University of Sousse, Tunisia Mulla, Imtiaz Sirajuddin, National Chemical Laboratory, Pune, India Nabok, Aleksey, Sheffield Hallam University, UK Neelamegam, Periasamy, Sastra Deemed University, India Neshkova, Milka, Bulgarian Academy of Sciences, Bulgaria Oberhammer, Joachim, Royal Institute of Technology, Sweden Ould Lahoucine, Cherif, University of Guelma, Algeria Pamidighanta, Sayanu, Bharat Electronics Limited (BEL), India Pan, Jisheng, Institute of Materials Research & Engineering, Singapore Park, Joon-Shik, Korea Electronics Technology Institute, Korea South Penza, Michele, ENEA C.R., Italy Pereira, Jose Miguel, Instituto Politecnico de Setebal, Portugal Petsev, Dimiter, University of New Mexico, USA Pogacnik, Lea, University of Ljubljana, Slovenia Post, Michael, National Research Council, Canada Prance, Robert, University of Sussex, UK Prasad, Ambika, Gulbarga University, India Prateepasen, Asa, Kingmoungut's University of Technology, Thailand Pullini, Daniele, Centro Ricerche FIAT, Italy Pumera, Martin, National Institute for Materials Science, Japan Radhakrishnan, S. National Chemical Laboratory, Pune, India Rajanna, K., Indian Institute of Science, India Ramadan, Qasem, Institute of Microelectronics, Singapore Rao, Basuthkar, Tata Inst. of Fundamental Research, India Raoof, Kosai, Joseph Fourier University of Grenoble, France Reig, Candid, University of Valencia, Spain Restivo, Maria Teresa, University of Porto, Portugal Robert, Michel, University Henri Poincare, France Rezazadeh, Ghader, Urmia University, Iran Royo, Santiago, Universitat Politecnica de Catalunya, Spain Rodriguez, Angel, Universidad Politecnica de Cataluna, Spain Rothberg, Steve, Loughborough University, UK Sadana, Ajit, University of Mississippi, USA Sadeghian Marnani, Hamed, TU Delft, The Netherlands Sandacci, Serghei, Sensor Technology Ltd., UK Schneider, John K., Ultra-Scan Corporation, USA Sengupta, Deepak, Advance Bio-Photonics, India Shah, Kriyang, La Trobe University, Australia Sapozhnikova, Ksenia, D.I.Mendeleyev Institute for Metrology, Russia Saxena, Vibha, Bhbha Atomic Research Centre, Mumbai, India

Seif, Selemani, Alabama A & M University, USA Seifter, Achim, Los Alamos National Laboratory, USA Silva Girao, Pedro, Technical University of Lisbon, Portugal Singh, V. R., National Physical Laboratory, India Slomovitz, Daniel, UTE, Uruguay Smith, Martin, Open University, UK Soleymanpour, Ahmad, Damghan Basic Science University, Iran Somani, Prakash R., Centre for Materials for Electronics Technol., India Srinivas, Talabattula, Indian Institute of Science, Bangalore, India Srivastava, Arvind K., Northwestern University, USA Stefan-van Staden, Raluca-Ioana, University of Pretoria, South Africa Sumriddetchka, Sarun, National Electronics and Computer Technology Center,

Thailand Sun, Chengliang, Polytechnic University, Hong-Kong Sun, Dongming, Jilin University, China Sun, Junhua, Beijing University of Aeronautics and Astronautics, China Sun, Zhiqiang, Central South University, China Suri, C. Raman, Institute of Microbial Technology, India Sysoev, Victor, Saratov State Technical University, Russia Szewczyk, Roman, Industrial Research Inst. for Automation and Measurement,

Poland Tan, Ooi Kiang, Nanyang Technological University, Singapore, Tang, Dianping, Southwest University, China Tang, Jaw-Luen, National Chung Cheng University, Taiwan Teker, Kasif, Frostburg State University, USA Thirunavukkarasu, I., Manipal University Karnataka, India Thumbavanam Pad, Kartik, Carnegie Mellon University, USA Tian, Gui Yun, University of Newcastle, UK Tsiantos, Vassilios, Technological Educational Institute of Kaval, Greece Tsigara, Anna, National Hellenic Research Foundation, Greece Twomey, Karen, University College Cork, Ireland Valente, Antonio, University, Vila Real, - U.T.A.D., Portugal Vanga, Raghav Rao, Summit Technology Services, Inc., USA Vaseashta, Ashok, Marshall University, USA Vazquez, Carmen, Carlos III University in Madrid, Spain Vieira, Manuela, Instituto Superior de Engenharia de Lisboa, Portugal Vigna, Benedetto, STMicroelectronics, Italy Vrba, Radimir, Brno University of Technology, Czech Republic Wandelt, Barbara, Technical University of Lodz, Poland Wang, Jiangping, Xi'an Shiyou University, China Wang, Kedong, Beihang University, China Wang, Liang, Pacific Northwest National Laboratory, USA Wang, Mi, University of Leeds, UK Wang, Shinn-Fwu, Ching Yun University, Taiwan Wang, Wei-Chih, University of Washington, USA Wang, Wensheng, University of Pennsylvania, USA Watson, Steven, Center for NanoSpace Technologies Inc., USA Weiping, Yan, Dalian University of Technology, China Wells, Stephen, Southern Company Services, USA Wolkenberg, Andrzej, Institute of Electron Technology, Poland Woods, R. Clive, Louisiana State University, USA Wu, DerHo, National Pingtung Univ. of Science and Technology, Taiwan Wu, Zhaoyang, Hunan University, China Xiu Tao, Ge, Chuzhou University, China Xu, Lisheng, The Chinese University of Hong Kong, Hong Kong Xu, Tao, University of California, Irvine, USA Yang, Dongfang, National Research Council, Canada Yang, Shuang-Hua, Loughborough University, UK Yang, Wuqiang, The University of Manchester, UK Yang, Xiaoling, University of Georgia, Athens, GA, USA Yaping Dan, Harvard University, USA Ymeti, Aurel, University of Twente, Netherland Yong Zhao, Northeastern University, China Yu, Haihu, Wuhan University of Technology, China Yuan, Yong, Massey University, New Zealand Yufera Garcia, Alberto, Seville University, Spain Zakaria, Zulkarnay, University Malaysia Perlis, Malaysia Zagnoni, Michele, University of Southampton, UK Zamani, Cyrus, Universitat de Barcelona, Spain Zeni, Luigi, Second University of Naples, Italy Zhang, Minglong, Shanghai University, China Zhang, Qintao, University of California at Berkeley, USA Zhang, Weiping, Shanghai Jiao Tong University, China Zhang, Wenming, Shanghai Jiao Tong University, China Zhang, Xueji, World Precision Instruments, Inc., USA Zhong, Haoxiang, Henan Normal University, China Zhu, Qing, Fujifilm Dimatix, Inc., USA Zorzano, Luis, Universidad de La Rioja, Spain Zourob, Mohammed, University of Cambridge, UK

Sensors & Transducers Journal (ISSN 1726-5479) is a peer review international journal published monthly online by International Frequency Sensor Association (IFSA). Available in electronic and on CD. Copyright © 2010 by International Frequency Sensor Association. All rights reserved.

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Volume 123 Issue 12 December 2010

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Research Articles

Development of Electromechanical Architectures for AC Voltage Metrology Alexandre Bounouh, François Blard, Henri Camon, Denis Belieres.................................................. 1 Design of Piezoelectric PZT Cantilever for Actuator Application Abhay B. Joshi, Dhananjay Bodas and S. A. Gangal ........................................................................ 16 Investigation Effect of Residual Stress On Pull-In Voltage of Circular Micro Plate Subjected to Nonlinear Electrostatic Force Farzad Choobdar Rahim .................................................................................................................... 25 Numerical Analysis of Thin Film Junctionless pH-ISFET Sensor Fayçal Djeffal, Mohammed Meguellati, Nedhal Abdelmalek and Toufik Bendib................................ 35 Investigation of Squeeze Film Effect on Dynamic Characteristics of Electrically Actuated Fully Clamped Micro-Beam Ali Asghar Keyvani Janbahan, Ahmad Ghanbari, Jafar Keyghobadi. ................................................................................................ 41 Novel Method for Static Dielectric Constant Measurement of Liquids Anil Tidar, S. P. Kamble, S. S. Patil, B. R. Sharma, P. W. Khirade and S. C. Mehrotra.................... 52 Development of (Aluminium) U Tube Type Vibration Based Electromechanical Mass Flow Sensor Pravin P. Patil, Satish C. Sharma, S. C. Jain. .................................................................................... 60 Accuracy and Metrological Reliability Enhancing of Thermoelectric Transducers Bogdan Stadnyk, Svyatoslav Yatsyshyn, Bogdan Yatsyshyn............................................................ 69 Mathematical Models of Methodical Error for Noise Thermometers Bogdan Stadnyk, Ihor Mykytyn........................................................................................................... 76 Electrical Pressure Transducers Based on Graphene Oxide Polysiloxane Composites Antonio Peluso, Mariano Palomba, Gianfranco Carotenuto, Francesca Nicolais.............................. 84 Humidity Sensing Characteristics of Bi2O3- added TiO2 Composites Vedhakkani Jeseentharani, John Pragasam, Arunachalam Dayalan, Karachalacheruvu Seetharamaiah Nagaraja, Boniface Jeyaraj....................................................................................... 91 Photoconductive Phenomenon Observed from ZnS Layer Deposition for a Potential of IR Sensor Applications Hariyadi Soetedjo and Gunawan S Prabowo..................................................................................... 100 Fourier Analysis of Normal ECG Signal to Find its Maximum Harmonic Content by Signal Reconstruction Satish chandra Bera, Rajan Sarkar.................................................................................................... 106

Design and Optimization of Revolute Flexure Joints for Compliant Parallel Mechanisms Qiaokang Liang, Dan Zhang, Quanjun Song and Yunjian Ge ........................................................... 118

Authors are encouraged to submit article in MS Word (doc) and Acrobat (pdf) formats by e-mail: [email protected] Please visit journal’s webpage with preparation instructions: http://www.sensorsportal.com/HTML/DIGEST/Submition.htm

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Sensors & Transducers Journal, Vol. 123, Issue 12, December 2010, pp. 52-59

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Novel Method for Static Dielectric Constant Measurement of Liquids

1Anil Tidar, 1S. P. Kamble, 1S. S. Patil, 2B. R. Sharma, 1*P. W. Khirade

and 3S. C. Mehrotra

1 Department of Physics, Dr. B.A.M. University Aurangabad, M.S., India 2Pratishthan Mahavidyalaya Paithan Aurangabad

3Department of Computer Science Dr. B.A.M. University, Aurangabad, M.S., India Tel.: +91 9922513633, fax: 91-240-2403 113/ 335

* E-mail: [email protected] (P.W. Khirade)

Received: 27 August 2010 /Accepted: 21 December 2010 /Published: 28 December 2010 Abstract: The dielectric constant measurement setup has been developed to measure static dielectric constant of liquids at low frequencies using integrated circuit of Monostable Multivibrator. The change in pulse width measured by using Tektronix TDS 2024 four channel digital storage oscilloscope. We can compute change in capacitance and hence calculate static dielectric of liquids. This paper reports the static dielectric constants measured by the technique of some pure polar, nonpolar liquids at 298 K. The details of its interface to measure static dielectric constant of liquids and evaluated results are explained in this paper. The method employed is simple, reliable and repeatability of results is very good. Copyright © 2010 IFSA. Keywords: Static dielectric constant, Tektronix TDS 2024 four channel digital storage oscilloscopes, Monostable multivibrator. 1. Introduction The static dielectric constant is fundamental property of the material and is independent of measurement technique. Measurement techniques typically involve pacing the material in an appropriate sample holder and determining the static dielectric constant from measurements made on the sample holder. The methods based on the Schering and others AC bridge has been extensively used for the measurement of dielectric constant in the low frequency range [1]. For instance Cole and Gross


53

developed a transformer bridge [2], and S. C. Bera et al. employed the modified Schering bridge for the measurement of dielectric parameters of a material [3], which required complex mathematical calculations. Various other attempts have been made to measure dielectric constant by using Hybrid Cavity-ring Technique [4] which includes the inductive effect of the ground lead, waveguide technique [5, 6], open-ended waveguide technique [7, 8], open-ended coaxial line technique [9, 10]. The waveguide technique and open-ended waveguide technique are accurate for the measurement of dielectric constant. These techniques are well suited for the measurement of liquid materials. These nondestructive techniques are based on the reflection coefficient and transmission coefficient measurement at microwave frequencies. Our main objective of this paper is to design and develop of a low cost and efficient unit in order to have accurate estimation of static dielectric constant of liquids. It employs an inexpensive and widely used IC’s viz. IC-555 and IC-74121. Basically these two IC’s are sole members of the multivibrator unit and implementation part which accounts for the simplicity of the device. 2. Experiment Details 2.1. Chemicals All polar and non-polar chemicals used in the present paper are of good quality and were used as available without further purification process. 2.2. Experimental Setup and Theory The experimental setup for static dielectric constant measurement consists of following parts: 1) Regulated power supply 2) Square wave oscillator (Astable multivibrator) 3) Monostable multivibrator 4) 200 MHz Digital waveform storage oscilloscope 5) Measurement cell (Cylindrical capacitor). The block diagram of experimental setup and its photograph are given in Figs. 1 and 2 respectively. DC regulated power supply has been developed using IC-7805. The IC-555 and IC-74121 are used for Astable and monostable multivibrator respectively. Sample cell, which is locally available which is of suitable dimension cylindrical cell, serve as a cylindrical capacitor and it is used as an experimental capacitor in monostable multivibrator circuit. Digital storage oscilloscope (Tektronix TDS 2024) is used for the measurement of pulse width. DC regulated power supply giving constant dc biasing voltage to Astable and monostable for its proper operation. Astable multiviberater serves as a trigger source to Monostable multivibrator and monostable multivibrator generates pulse, the time width of the pulse is determined by an external resistor and capacitor connected. The length of the pulse (pulse width) is determined by the formula

, (1)

where, eR xt and extC are the external resistance and capacitor respectively.


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Fig. 1. Block diagram of experimental setup.

Fig. 2. Photograph of Static dielectric constant measurement setup.

The change in pulse width depends on change in value of external capacitor used in the timing circuit of Monostable multivibrator, which depends on dielectric properties of liquids in the sample cell (Cylindrical capacitor). Finally these observations are recorded with the help of digital storage oscilloscope. Thus pulse widths with and without sample are recorded. Difference between these pulses is used to evaluate the value of static dielectric constant.


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The capacitance of the cylindrical capacitor with sample (Cm) and without sample (Co) is with neglecting fringing field effects (due to the l>>a),

(2)

and

(3)

For air =1 where, l is the length of inner conductor of the cylindrical capacitor; 0 is the absolute free space permittivity; ro is the relative static dielectric constant, without liquid; r is the static dielectric constant, with liquid; b is the inner radius of outer electrode of cylindrical capacitor; a is the radius of inner electrode of cylindrical capacitor; The static dielectric (εr) constant is defined as the ratio of capacitance with material and

capacitance without material, i.e.,

(4)

Pulse width depends on values of external resistance and capacitor used in the timing circuit of Monostable multivibrator. As external resistance is constant so the pulse width depends on external material which is placed in the sample cell (cylindrical cell) or capacitance. From equation (1) it is clear that positive pulse width is directly proportional to the capacitance of the capacitor

, (5)

where Tm and To are the pulse widths with and without medium or

, (6)

where and

(7)

or (8)


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where

is the geometrical constant for the experimental cell. Thus

(9)

Using equation (9) we can estimate r. For the calibration purpose of experimental setup we have used some polar and nonpolar pure liquids and calculated value of A by using following formula.

(10)

Using equation (10), the geometrical cell constant can be estimated in terms of known values dielectric constants of some polar and nonpolar liquids. By substituting the average value of geometrical cell constant (A) in equation (9), we can estimate the static dielectric constants of liquids under investigation. 3. Result and Discussion The observed waveforms for 2-Butoxyethanol and N, N-Dimethylformamide pure liquids are shown in Figs. 3 and 4, respectively. The observed and literature static dielectric constant values are also shown in Table 1. The percent error is also indicated in the table.

Fig. 3. Observed waveform pulses without and with 2-Butoxyethanol sample at 298 K.


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Fig. 4. Observed waveform pulses without and with N, N-Dimethylformamide sample at 298 K.

Table 1. Observation table for the determination of cell constant and estimation of εr

Name of liquids

pulse width

without liquid To (ns)

pulse width with

liquid Tm (ns)

= Tm-To (ns)

Lit. values of εr [11]

Cell Constant

(A)

Estimated Values of

εr

% error

Heptane 48 48.6 0.6 1.92 0.65 1.94 0.91 Dipentyl ether 48 49.1 1.1 2.798 0.61 2.72 -2.83 Bromobenzene 48 50.8 2.8 5.4 0.64 5.38 -0.46

2-Butoxyethanol 48 52.7 4.7 - - 8.34 - 2-Ethoxyethanol 48 55.45 7.45 - - 12.64 -

1-Hexanol 48 55.7 7.7 13.3 0.63 13.03 -2.02

2-Methoxyethanol 48 58.18 10.18 - - 16.91 -

1-Butanol 48 58.4 10.4 17.1 0.65 17.25 0.88 2-Propanol 48 58.9 10.9 18.3 0.63 18.03 -1.47 1-Propanol 48 60.2 12.2 20.1 0.64 20.06 -0.19

Acetone 48 60.3 12.3 20.7 0.62 20.22 -2.32 Ethanol 48 62.9 14.9 24.3 0.64 24.28 -0.08

Ethanol amine 48 64 16 - - 26.00 - Methanol 48 68 20 32.63 0.63 32.25 -1.16

Nitrobenzene 48 69.5 21.5 34.8 0.64 34.59 -0.59 N, N-

Dimethylformamide 48 71.5 23.5 37.06 0.65 37.72 1.78

Ethylene glycol 48 72.8 24.8 - - 39.75 -

Average value of

(A) 0.64

Plot of observed pulse width difference for different liquids mentioned in table 1 versus literature values of the corresponding static dielectric constant is shown in Fig. 5. Line of best fit obtained by performing regression analysis using the model equation (9) is also drawn in the figure. The statistical analysis of the model is given in Table 2.


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Fig. 5. Literature values of static dielectric constant versus observed pulse width difference for the liquids mentioned in table 1 at 298 K.

Table 2. Statistical analysis of model.

Regression variable slope Value 1.5655 Standard Error of variable 0.0064 95 % Confidence Intervals (+/-) 0.0141 Standard Error of the Estimate 0.3027 R2 0.999

4. Conclusions Observed values with present technique for different pure liquids are in good agreement with literature values. Thus the method seems to be a simple and accurate technique for estimation of dielectric constant of liquids. References [1]. C. P. Smyth, Dielectric behaviour and structure, McGraw Hill Book Co. Inc., New York, 1955. [2]. Cole R. H. and P. M. Gross, A wide range capacitance conductance bridge, Ret. Sci. Instrum., Vol. 20,

1949, pp. 252-60. [3]. S. C. Bera and S. Chattopadhyay, A Modified Schering Bridge for the Measurement of Dielectric

Parameters of a Material and Capacitance of a Capacitive Transducer, Measurement, Vol. 33/1, 2003, pp. 3-7.

[4]. M. S. Kheir, H. F. Hammad, and A. S. Omar, Measurement of the Dielectric Constant of Liquids Using a Hybrid Cavity-ring Resonator, PIERS Proceedings, Cambridge, USA, 2008.

[5]. J. A. R. Ball, and B. Horsfield, Resolving ambiguity in broadband waveguide permittivity measurements on moist materials, IEEE Trans. Instrum. Meas., Vol. 47, No. 2, 1998, pp. 390-392.

[6]. M. T. Hallikainen, F. T. Ulaby, M. C. Dobson, M. A. EI-Rayes, and L. K. Wu, Microwave dielectric behavior of wet soil-part-I: empirical modes and experimental observation, IEEE Trans. Geosci. Remote sensing, Vol. 23, No 1, 1985, pp. 25-34.

[7]. M. C. Decreton and M. S. Ramachandraiah, Nondestructive measurement of complex permittivity for


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dielectric slabs, IEEE Trans. Microwave Theory Tech., Vol. 23, 1975, pp. 1077-1080. [8]. C. W. Chang, K. M. Chen, and J. Qian, Nondestructive determination of electromagnetic parameters of

dielectric materials at X-band frequencies using a waveguide probe system, IEEE Trans. Instrum. Meas., Vol. 46, No 5, 1997, pp. 1084–1092.

[9]. D. Misra, M. Chabbra, B. R. Epstein, M. Mirotznik and K. R. Foster, Noninvasive electrical characterization of materials at microwave frequencies using an open-ended coaxial line, IEEE Trans. Microwave Theory Tech., Vol. 38, No. 1, 1990, pp. 8–14.

[10]. J. Bao, M. L. Swicord, and C. C. Davis, Microwave dielectric characterization of binary mixtures of water, Methanol and Ethanol, Journal of Chemical Physics, Vol. 104, No. 12, 1996, pp. 4441– 4450.

[11]. R. C. Weast, Handbook of Chemistry and Physics, 69th Edition, CRC Press, Florida, 1988-1989.

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Aims and Scope Sensors & Transducers Journal (ISSN 1726-5479) provides an advanced forum for the science and technology of physical, chemical sensors and biosensors. It publishes state-of-the-art reviews, regular research and application specific papers, short notes, letters to Editor and sensors related books reviews as well as academic, practical and commercial information of interest to its readership. Because it is an open access, peer review international journal, papers rapidly published in Sensors & Transducers Journal will receive a very high publicity. The journal is published monthly as twelve issues per annual by International Frequency Association (IFSA). In additional, some special sponsored and conference issues published annually. Sensors & Transducers Journal is indexed and abstracted very quickly by Chemical Abstracts, IndexCopernicus Journals Master List, Open J-Gate, Google Scholar, etc. Topics Covered Contributions are invited on all aspects of research, development and application of the science and technology of sensors, transducers and sensor instrumentations. Topics include, but are not restricted to: • Physical, chemical and biosensors; • Digital, frequency, period, duty-cycle, time interval, PWM, pulse number output sensors and transducers; • Theory, principles, effects, design, standardization and modeling; • Smart sensors and systems; • Sensor instrumentation; • Virtual instruments; • Sensors interfaces, buses and networks; • Signal processing; • Frequency (period, duty-cycle)-to-digital converters, ADC; • Technologies and materials; • Nanosensors; • Microsystems; • Applications. Submission of papers Articles should be written in English. Authors are invited to submit by e-mail [email protected] 8-14 pages article (including abstract, illustrations (color or grayscale), photos and references) in both: MS Word (doc) and Acrobat (pdf) formats. Detailed preparation instructions, paper example and template of manuscript are available from the journal’s webpage: http://www.sensorsportal.com/HTML/DIGEST/Submition.htm Authors must follow the instructions strictly when submitting their manuscripts. Advertising Information Advertising orders and enquires may be sent to [email protected] Please download also our media kit: http://www.sensorsportal.com/DOWNLOADS/Media_Kit_2009.pdf

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