JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course Prerequisites: Physics and Mathematics

Course Objectives:

• 1. To know the principle of sensors and transducer technology and measurementsystems
• 2. To provide a knowledge in Theoretical and Practical concepts of Transducers
• 3. To know the utilization of different sensors and their applications
• 4. To learn various measurement methods of physical parameters like velocity, acceleration, torque, pressure, flow, temperature etc.

Course Outcomes

Upon successful completion of the course, students will be able to:

• 1. Identify suitable sensors and transducers for real world applications such as level, temperature, vibration, light etc.,
• 2. Translate theoretical concepts into working models
• 3. Design the experimental applications to engineering modules and practices
• 4. Design engineering solution to the Industry/Society needs and develop products Course PO1 PO2 PO3 PO4 PO5 PO6 PO7 PO8 PO9 PO10 PO11 PO12 CO1 3 3 - - - - - - - - - 1 CO2 3 3 2 - - - - - - - - 1 CO3 3 3 2 2 - - - - - - - 1 CO4 3 3 2 2 - - - - - - - 1

UNIT - I

Introduction to Measurement Systems: General concepts and terminology, measurement systems, sensor classifications: Analog Input and Output, Digital Input and Output, General input-output configuration, methods of correction.

UNIT - II

Passive Sensors: Resistive Sensors: Potentiometers, Strain Gauges, Resistive Temperature Detectors (RTDs): Three wire and Four wire, Thermistors, Light-dependent Resistors (LDRs), Resistive Hygrometers. Capacitive Sensors: Variable capacitor and Differential capacitor, CapacitiveTouch sensors. Inductive Sensors: Reluctance variation sensors, Eddy current sensors, Linear Variable Differential Transformers (LVDTs), Magneto elastic sensors, Electromagnetic Sensor based on Faraday‘s law of Electromagnetic induction-search coil magnetometers. Introduction to proximity sensors.

UNIT - III

Self-generating Sensors: Thermoelectric Sensors: Thermocouples-Thermo electric effects, Common thermocouples, Practical thermocouple laws, Cold junction compensation in thermocouple circuits. Thermowell. Piezoelectric Sensors: Piezoelectric effect, piezoelectric materials, applications. Pyroelectric Sensors: Pyroelectric effect, pyroelectric materials, Radiation laws: Plank, Wein and Stefan- Boltzmann,Applications. Photovoltaic Sensors: Photovoltaic effect, materials and applications. Hall Effect Sensors

UNIT - IV

Digital Sensors: Position Encoders, Incremental position encoders, absolute position encoders, Variable frequency sensors-Quartz digital thermometers, vibrating cylinder sensors, SAW sensors. Introduction to Smart Sensors: Introduction to MEMS Sensors.

UNIT - V

Signal Conditioning: Voltage dividers, Wheatstone bridge, Instrumentation amplifier, Programmable gain amplifier, linearization of resistive bridge sensor, Electrostatic shield, Noise elimination using filters, Introduction to Synchros and Resolvers.

TEXT BOOKS:

• 1. Areny, John G. Webster, Ramon Pallas - Sensors and Signal Conditioning, 2nd Ed., Wiley
• 2. D. Patranabis -Sensors and Transducers, TMH, 2003

REFERENCE BOOKS:

• 1. Jon Wilson -Sensor Technology Hand Book, Newne 2004 Herman
• 2. K. P. Neubrat -Instrument Transducers, An Introduction to their Performance and Design, Oxford University Press
• 3. E. O. Doeblin -Measurement System: Applications and Design, McGraw-Hill Publications