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Instrumentation (AMME2700) 1 Instrumentation Dr. Xiaofeng Wu.

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1 Instrumentation (AMME2700) 1 Instrumentation Dr. Xiaofeng Wu

2 Instrumentation (AMME2700) Instructors  Coordinator and Lecturer: Dr. Xiaofeng Wu  Office: N314, School of Aerospace, Mechanical and Mechatronic Engineering  Phone: 90367053  Email:  Course website: 00/Documents/ 00/Documents/  Tutor & Demonstrator: Mr. Trevor Kwan, Mr. Jimmy Sun

3 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.

4 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%

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

6 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

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

8 Instrumentation (AMME2700) An Electrical System

9 Instrumentation (AMME2700) Example 1

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

11 Instrumentation (AMME2700) Atom and Electric Charge

12 Instrumentation (AMME2700) Electric Charge 

13 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  10 28 positive charges and 5  10 28 negative charges, balanced within trillions  one trillion is small compared to 10 28 : less than one quadrillionth of our total charge is unbalanced!

14 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.

15 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

16 Instrumentation (AMME2700) Power and Energy in Circuits

17 Instrumentation (AMME2700) Passive Convention

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

19 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.

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