Ic010 403: Transducer Engineering

IC010 403: TRANSDUCER ENGINEERING

Teaching Scheme Credits:4 3 Hours lecture and 1 Hour tutorial per week

Aim: To provide adequate knowledge in sensors & transducers.

Objective:  To impart knowledge about the principles and analysis of sensors.  To know about the classification and characteristics of transducers.  To have an adequate knowledge in resistance and inductance transducers.  Basic knowledge in capacitance and piezoelectric transducers.  Pressure, Digital and other miscellaneous sensors

Module-I: Science of Measurement Measurement systems – Significance of Measurements, Characteristics of Instruments – Static and Dynamic, Loading Effects, Types of errors, Error analysis, Units and Standards. Calibration and Standards: Process of calibration, classification of standards, standards for calibration.

Module- II: Classification and Characteristics of Transducer Transducer – Definition, Classification of Transducer – analog and digital transducer- primary and secondary transducer- active and passive transducer-Inverse transducer, Characteristics and choice of transducer, Factors influencing choice of transducer.

Module-III: Resistance and Inductance Transducer Resistance Transducer-Basic principle, Potentiometer – Loading effects, Resolution, Linearity, Non-linear Potentiometer, Noise in potentiometer, Resistance strain gauge – Types, Resistance thermometer, thermistors – characteristics, thermocouple – Compensation circuits – junction and lead compensation, merits and demerits. Inductance Transducer:- Basic principle, Linear variable differential transformer (LVDT), Rotary Variable Differential Transformer (RVDT), Synchros, Induction potentiometer, variable reluctance accelerometer, Microsyn.

Module- IV: Capacitance and Piezoelectric Transducer Capacitance Transducer – Basic principle, transducers using change in - area of plates distance between plates- variation of dielectric constants, frequency response, Merits, demerits and uses. Piezoelectric transducer- Basic principle, Mode of operation, properties of piezoelectric crystals, loading effects, frequency response and impulse response uses.

Module-V: Pressure, Digital and other miscellaneous sensors Pressure sensors – bourdon tube, bellows, Pitot tube, diaphragm. Digital Transducer – shaft encoder, optical encoder, digital speed transducer. Hall Effect transducer, sound sensors, vibration sensors – seismic transducer, chemical sensor – pH sensor, velocity transducer, Introduction to smart sensors, micro sensor. Text Books 1. A.K. Sawhney “A Course in Electrical and Electronics Measurements and Instrumentation” – Dhanpat Rai & Co., (Pvt) Ltd., 2000. 2. S.Renganathan “Transducer Engineering” – Allied publishers Limited, 1999.

Reference Books 1. Ernest O. Doeblin “Measurement Systems – Application & Design” McGraw – Hill Publishing company, 1990. 2. Woolvert, G.A., “Transducer in Digital Systems” Peter Peregrinus Ltd., England, 1998.