Measurement of Displacement using LVDT 
References
Books and Links
Techkor, Inc., “An Introduction to Linear Variable Differential Transformer”, http://www.globalspec.com/Goto/GotoWebPage?gotoUrl=/ACTTechkor/ref/TB31/TechkorTB31.html&gotoType=TechArticle&VID=245&CategoryID=1136 (current December 2002).
Raghavendra, G. N., & Girisha, H. R. (2018). Transducers and Instrumentation: A Laboratory Manual for Engineering Students. Springer.