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Vol. 81, Issue 7, July 2007, pp. 1341-1347




PC Based Linear Variable Differential Displacement Measurement Uses Optical Technique


Tapan Kumar MAITI, Prasenjit PAUL, Indrajit DAS and Soumen SAHA

Transducers and Sensors Laboratory, College of Engineering & Management,

Kolaghat KTPP Township, Midnapore 721 171, West Bengal, India

E-mail: tk_maiti@rediffmail.com



Received: 28 June 2007   /Accepted: 16 July 2007   /Published: 23 July 2007


Abstract: PC based linear variable differential displacement (LVDD) measurement with optical approach has been presented. The technique is a good blending of both hardware and software and is basically an alternative method of linear variable differential transformer (LVDT). A visual basic (VB) programming is used for this PC based measurement. Here the voltage output and the displacement of the reflector can be studied and stored continuously. Theoretical predictions are supported by experimental results. This technique can be used for the measurement of some non-electrical parameters e.g. force, torque and liquid level etc.


Keywords: Linear variable differential displacement, LVDT, reflector, look-up-table, VB programming, infrared diode and photo detector


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