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Study of the Effect of Excitation Frequency Variation on the Output of LVDT

Subhashis Maitra. Published in Signal Processing.

Communications on Applied Electronics
Year of Publication: 2015
Publisher: Foundation of Computer Science (FCS), NY, USA
Authors: Subhashis Maitra
10.5120/cae2015651981

Subhashis Maitra. Article: Study of the Effect of Excitation Frequency Variation on the Output of LVDT. Communications on Applied Electronics 3(6):32-38, December 2015. Published by Foundation of Computer Science (FCS), NY, USA. BibTeX

@article{key:article,
	author = {Subhashis Maitra},
	title = {Article: Study of the Effect of Excitation Frequency Variation on the Output of LVDT},
	journal = {Communications on Applied Electronics},
	year = {2015},
	volume = {3},
	number = {6},
	pages = {32-38},
	month = {December},
	note = {Published by Foundation of Computer Science (FCS), NY, USA}
}

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

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Keywords

Capacitance, Excitation frequency, Inductances, LVDT, Transducer.