CONSTRUCTION AND CALIBRATION OF A LINEAR VARIABLE DIFFERENTIAL TRANSFORMER (LVDT)

ABSTRACT

A Linear Variable Differential Transformer (LVDT) was constructed having a primary

winding of 245 turns and two secondary windings of 100 turns each. The device
was calibrated with a graduated cylindrical rod. The graduated rod when
inserted between the hollow tube which has the windings gave output voltages of
±0.046V, ±0.51V, ±0.088V, ±0.155V, ±0.271V and ±0.395V for displacements of
±0.00cm, ±2.00cm, ±4.00cm, ±6.00cm, ±8.00cm and 10.00cm respectively. The
device when used for measurement shows that there is increase in output voltage
with increase in displacement and vice versa.

TABLE OF CONTENTS

xi

CHATER ONE

1.0Introduction1

1.1Justification 2

1.2Scope of the study3

1.3Aim and objective 4

CHAPTER TWO

2.0Literature review5

2.1Historical background of LVDT5

2.1.1Development of LVDT6

2.2Transducers12

2.3Make-up of the LVDT13

2.4Displacement measurement with LVDT14

2.5How to connect LVDTs16

2.6Advantages and disadvantages of LVDT19

2.6.1Advantages 19

2.6.2Disadvantages 20

CHAPTER THREE

3.0Construction and Testing21

3.1Materials21

3.2Construction21

3.3Testing and Calibration 22

CHAPTER FOUR

4.0Result24

CHAPTER FIVE

5.0Discussion, Conclusion and Recommendation26

5.1Discussion 26

5.2Conclusion27

5.3Recommendation27

Reference 28

Appendix 29