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

1.0 Introduction 1

1.1 Justification 2

1.2 Scope of the study 3

1.3 Aim and objective 4

CHAPTER TWO

2.0 Literature review 5

2.1 Historical background of LVDT 5

2.1.1 Development of LVDT 6

2.2 Transducers 12

2.3 Make-up of the LVDT 13

2.4 Displacement measurement with LVDT 14

2.5 How to connect LVDTs 16

2.6 Advantages and disadvantages of LVDT 19

2.6.1 Advantages 19

2.6.2 Disadvantages 20

CHAPTER THREE

3.0 Construction and Testing 21

3.1 Materials 21

3.2 Construction 21

3.3 Testing and Calibration 22

CHAPTER FOUR

4.0 Result 24

CHAPTER FIVE

5.0 Discussion, Conclusion and Recommendation 26

5.1 Discussion 26

5.2 Conclusion 27

5.3 Recommendation 27

Reference 28

Appendix 29