Course Title: 
Metrology and Measurements
Course Code: 
Year Taught: 
Subject Core
Undergraduate (UG)
School of Engineering

'Metrology and Measurements' is a course offered in the sixth semester of B. Tech. in Mechanical Engineering program at School of Engineering, Amrita Vishwa Vidyapeetham.

Unit 1

Concept of Metrology: Definition and concept of Metrology - need of Inspection - Generalized measurement system - Units and standards - measuring instruments; sensitivity, stability, range, accuracy and precision, static and dynamic response, repeatability - systematic and random errors - correction; calibration.

Linear Measurements: Vernier-caliper, Vernier depth gauge, Micrometer, Depth micrometer, Digital micrometer. Slip gauges: wringing of slip gauges and classification - Tool maker’s microscope. Dial indicators - classification and working mechanism. Limit gauges; Comparators: Mechanical, pneumatic and electrical types, applications - Height Gauge, Bore Gauge and Feeler Gauge.

Angular Measurements: Uses of the Vernier Bevel protractor, Universal Bevel protractor and Optical Bevel protractor. Sine bars – Uses and limitations of sine bar - Taper measurements. Sources of errors in sine bars, Sine Centre and Sine tables – Auto collimator and its applications.

Unit 2

Surface Texture and Screw Thread Measurement: Elements of surface texture - Evaluation of surface finish - Peak to valley height - Talysurf, Tomlinson surface meter - Screw thread terminology - Measurement of various elements of thread; Measurement of thread angle by two wire and Three wire methods; Thread gauges and floating carriage micrometer.

Form Measurements: Measurement of Straightness, Flatness, Parallelism, squareness testing, Roundness testing - Radius Gauge, Wire Gauge, etc.

Signal Representation – Signal conditioners, filters, ADC, DAC

Unit 3

W heatstone bridge, use of bridge circuits - Displacement measurement - Potentiometer - LVDT, Piezo electric type - Velocity measurement.

Nature of Vibration, accelerometers.

Strain measurement types, mechanical strain gauge, Electrical strain gauge, selection of strain gauge.

Temperature measurement: Bimetallic thermometer, Platinum resistance thermometers, Thermocouples and Pyrometers – Pressure fundamentals; Elastic transducers, thermal conductivity gauges, Vacuum pressure measurement, Flow measurement - Ultrasonic flow meter - turbine type meters - Hot wire anemometers.

  • J. F. W. Gayler, and C. R. Shotbolt - ‘Metrology for Engineers’ ELBS -1990
  • JONES’ - ‘Instrument Technology’ Volume - 1, Mechanical Measurement’ - Edited by B. E. Noltingk - ELBS - 4th Edition
  • I. C. Gupta - ‘Text Book of Engineering Metrology’ – Dhanpat Rai, Publishing Company - 2011 - 7th Edition
  • Alan S. Morris - ‘The Principles of Measurements and Instrumentation’ - Prentice-Hall of India - 2001
  • R. K. Jain - ‘Engineering Metrology’ Khanna Publishers, Delhi - 2009 - 5th Edition
  • Gupta S. C. - ‘Engineering Metrology’ - Dhanpatrai Publications - 2010
  • Dr. D. S. Kumar - ‘Mechanical Measurements & Control’ - Metropolitan Book Co. Private Ltd. - ISBN 81-200 0214-8
  • Bechwith-Marangoni-Lienhard - ‘Mechanical Measurements’ - Pearson Education Asia - 2011 - 6th Edition Reprint.