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UNIT 10 INTRODUCTION TO TRANSDUCERS Introduction to ...
117 INTRODUCTION to TRANSDUCERS and Sensors UNIT 10 INTRODUCTION TO TRANSDUCERS AND SENSORS Structure INTRODUCTION Objectives Active and Passive Sensors Basic Requirements of a sensor / transducer Discrete Event Sensors Mechanical Limit Switches proximity Limit Sensors Photoelectric Sensors Fluid Flow Switch TRANSDUCERS Position TRANSDUCERS Velocity TRANSDUCERS Force or Pressure TRANSDUCERS Temperature TRANSDUCERS Summary Key Words Answers to SAQs INTRODUCTION Sensors can be broadly classified in two categories: discrete event and continuous. Discrete event, or on/off sensor , changes its state based on the occurrence of some external event. These sensors typically only give knowledge of two states based on the condition being sensed.
inductive proximity switch and the capacitive proximity switch. Inductive proximity sensors are designed to operate by generating an electromagnetic field and detecting the eddy current losses generated when ferrous or non-ferrous metal target objects enter the field. The sensor consists of a coil on a ferrite core, an oscillator,
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