Instrumentation (AMME2700) 1 Instrumentation Dr. Xiaofeng Wu

Instrumentation (AMME2700) Instructors  Coordinator and Lecturer: Dr. Xiaofeng Wu  Office: N314, School of Aerospace, Mechanical and Mechatronic Engineering  Phone:   Course website: 00/Documents/ 00/Documents/  Tutor & Demonstrator: Mr. Trevor Kwan, Mr. Jimmy Sun

Instrumentation (AMME2700) Lectures, Tutorials and Labs  Lectures, week 1 to 13  1 hour lecture on Wednesdays and 1 hour lecture on Fridays  Tutorials, week 2 to 13  One × 2 hour tutorials each week (group dependent)  Attendance to the Tutorials: to be regularly checked every week. Attendance at tutorials is compulsory and will be counted in the Assignment marks in part. There is an assignment every 4 weeks. Failure to attend one week tutorial will lead to 25% loss of the marks in this corresponding assignment. e.g. If there are 3 questions in weeks 5-8 assignment and the raw marks of your assignment is, say, 25 (each question is worth evenly 10 marks), but you miss 2 week tutorials, then the final marks of your assignment will be 25–25×2×25%=25– 25×50%=12.5 marks. But failure to attend totally 4 week tutorials will lead to zero mark in your assignment. No late submission of assignment is possible.  Stay with your timetabled tutorial session in order to record your attendance properly.  Labs, week 2 to 13  Electronic Circuitry and Instrumentation  Each lab runs three hours  Stay with your timetabled lab session in order to record your attendance properly.

Instrumentation (AMME2700) Assessments  3 Assignments: 10% each  2 Laboratory reports:  5% Electronic Circuitry  5% Instrumentation  2 Quizzes: 10% each (weeks 6 and 13 respectively)  Final exam: 40%

Instrumentation (AMME2700) Contents  Analysis of Circuits  Basic components, Kirchhoff Laws  DC/AC circuits  Signal conditioning circuits  Data acquisition  Sensors  Strain, force, displacement, velocity …

Instrumentation (AMME2700) References  Dorf R. and Svoboda J., Introduction to Electric Circuits (8 th Edition), John Wiley & Sons, Inc.  Cogdell, J. R., Foundations of Electrical Engineering (2 nd Edition), Prentice Hall

Instrumentation (AMME2700) Introduction Power Supply Transducer Signal Conditioning Circuits Amplifier Recorder Data Processor Controller Command

Instrumentation (AMME2700) An Electrical System

Instrumentation (AMME2700) Example 1

Instrumentation (AMME2700) Basic Electrical Components a)Resistor b)Capacitor c)Inductor

Instrumentation (AMME2700) Atom and Electric Charge

Instrumentation (AMME2700) Electric Charge 

Instrumentation (AMME2700) Charge Balance  Neutral atoms are made of equal quantities of positive and negative charges  Neutral carbon has 6 protons, 6 electrons, (& neutrons)  Electrons can be stripped off atoms  Electrons occupy the vulnerable outskirts of atoms  Usually charge flows in such a way as to maintain neutrality  Excess positive charge attracts excess negative charge  Your body has 5  positive charges and 5  negative charges, balanced within trillions  one trillion is small compared to : less than one quadrillionth of our total charge is unbalanced!

Instrumentation (AMME2700) Current and Voltage  Current is the time rate of flow of electric charge past a given point  The voltage is the work (energy) required to move a unit positive charge from – terminal to the + terminal.

Instrumentation (AMME2700) Example 1  Find the current in an element when the charge entering the element is q=12t C, where t is the time in seconds

Instrumentation (AMME2700) Power and Energy in Circuits

Instrumentation (AMME2700) Passive Convention

Instrumentation (AMME2700) Example 2  Please determine the power absorbed by each device:

Instrumentation (AMME2700) Conservation of Energy  Conservation of energy requires that the sum of the power absorbed by all of the elements in a circuit be zero.