The week's pick
Random Articles
Reseach Article
Study of the Effect of Excitation Frequency Variation on the Output of LVDT
| Communications on Applied Electronics |
| Foundation of Computer Science (FCS), NY, USA |
| Volume 3 - Number 6 |
| Year of Publication: 2015 |
| Authors: Subhashis Maitra |
10.5120/cae2015651981
|
Subhashis Maitra . Study of the Effect of Excitation Frequency Variation on the Output of LVDT. Communications on Applied Electronics. 3, 6 ( December 2015), 32-38. DOI=10.5120/cae2015651981
Abstract
Linear Variable Differential Transformer (LVDT) is a displacement transducer which found its widespread application in process industry for the measurement of flow [1], pressure [2], level [3] and temperature [4] in terms of displacement. LVDT is also used to measure force [5], velocity [6] etc. with a high degree of accuracy and reliability. It is well known that the output of LVDT varies linearly with the core motion based on some pre-assumption as mentioned in different literatures [1] – [8]. However the output is not perfectly linear because of the effect of the construction of the LVDT, material of the core; inter winding capacitance, stray capacitance and self inductances of the primary and secondary. Again the reactance of capacitance and inductance vary with the excitation frequency. Hence, though the output of LVDT is assumed linear with the excitation frequency, but in practice, it varies nonlinearly with the excitation frequency. In this paper, the effect of the excitation frequency on the output of LVDT has been studied and the outputs have been tabulated for the frequency range 50 Hz to 100 Hz. Also the variation of the output with frequency has been explained graphically.
References
- D. Patranabis, Principles of Industrial Instrumentation (Second Edition), 2000, Tata McGraw-Hill Publication.
- L.A. Sharif, M. Kilani, S. Taifour, A. J. Issa, E. A. Qaisi, F. A. Eleiwi and O. N. Kamal, “Linear Variable Differential Transformer Design and Verification using MATLAB and Finite Element Analysis”, www.intechopen.com.
- U.K. Muhammad, S. Umar, “Sensitivity Determination of Linear Variable Differential Transducer (LVDT) in Fluid Level Detection Techniques”, International Journal of Modern Engineering Sciences, vol. 2(2), pp(s). 73 -83, 2013.
- D. L. Knudson, J. L. Rempe, “Evaluation of LVDTs for Use in ATR Irradiation Experiments”, Sixth American Nuclear Society International Meeting on Nuclear Plant Instrument, Control and Human-Machine Interface Technologies, NPIC&HMIT 2009, Knoxville, Tennessee, April 5-9, 2009, on CD-ROM, American Nuclear Society, LaGrange Park, IL (2009).
- Saxena, S.C. and Saksena, S. B. L., “A self compensated smart LVDT transducer”, IEEE Trans. Inst. & Meas. Vol. 38 No. 3, 1989, pp. 748-753.
- D. J. White, W. A. Take and M. D. Bolton, “Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry,” Geotechnique, vol. 53, no. 7, pp. 619-631, 2003.
- Pataranabis, D.; Ghosh. S. and Bakshi, C., “Linearining transducer characteristics”, IEEE Trans. Inst. & Meas. Vol. IM 37 No. 1, March 1988, pp. 66-6
- Holmberg, P., “Automatic balancing of linear ac bridge circuit for capacitive sensor elements”, IEEE Trans. Inst. & Meas. Vol. 44 No. 3, June 1995, pp. 803-805
- R. Mishra, “LVDT: Basic Principle, Theory, Working, Explanation & Diagram - Linear Variable Differential Transformer” July 21, 2012, https://learnprotocols.Wordpress.com/2012/07/21/lvdt-basic-principle-theory-working-explanation-diagr am-linear-variable-differential-transformer/
- A. Fuchs, M. J. Moser, H. Zangl and T. Bretterklieber, “Using Capacitive Sensing to Determine the Moisture Content of Wood Pellets – Investigations and Application, International Journal on Smart Sensing and Intelligent Systems, vol. 2, no. 2, June 2009.
- M. Soleimani and M. G. Afshar, “Potentiometric Sensor for Trace Level Analysis of Copper Based on Carbon Paste Electrode Modified with Multi-walled Carbon Nanotubes”, Int. J. Electrochemical. Sci., vol. 8, pp(s). 8719 – 8729, 2013.
- S.V. Thatthachary, B. George and V.J. Kumar, “A resistive potentiometric type transducer with contactless slide, Seventh International Conference on Sensing Technology (ICST), 3-5 December, 2013, pp(s). 501 – 505.
- E. O. Doebelin, Measurement Systems-Application & Design, 5th ed. New York: McGraw-Hill, 2004.
- S. K. Mishra and G. Panda, “A novel method for designing LVDT and its comparison with conventional design”, Proceedings of the 2006 IEEE Sensors Applications Symposium, pp(s). 129-134, 2006.
- P. Chellapandi, V. R. Babu, P. Puthiyavinayagam, S. C. Chetal and B. Raj, “Experimental Evaluation of Integrity of FBR Core under Seismic Events”, Journal of Power and Energy Systems, vol. 2, No. 2, pp(s). 582 – 589.
- P. K. Dhiman, K. Pal and R. K. Sharma, “Strain Gauge Based Displacement Sensor”, Journal of Physical Sciences, Vol. 10, 2006, pp(s). 164 – 166.
- H. Norton, “Transducer fundamentals,” in Handbook of Transducers, Englewood Cliffs, NJ: Prentice Hall, 1989, Ch. 2.
Index Terms
Keywords