Page 873 - Basic Electrical Engineering

12

Transducers

TOPICS DISCUSSED

Use of transducers in measurement system
Classification of transducers
Characteristics of transducers
Linear variable differential transducer
Capacitive transducer
Inductive transducer
Potentiometric transducer
Strain gauge transducer
Thermistor
Thermocouples
Hall effect transducer
Photoelectric transducer
Selection of transducers

12.1 INTRODUCTION

When we are to measure any non-electrical quantity like displacement,

pressure, temperature, strain, etc., we first convert the measuring quantity
into a proportional electrical signal, i.e., voltage or current. This is done with
the help of devices called transducers. Therefore, we can state that a

transducer is a device which converts a non-electrical quantity to be
measured into a proportional electrical signal. Such a transducer is also

called an electric transducer.