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Instrumentation
Dr. Xiaofeng Wu
Instrumentation (AMME2700)
1
Instructors
Coordinator and Lecturer: Dr. Xiaofeng Wu
 Office: N314, School of Aerospace, Mechanical
and Mechatronic Engineering
 Phone: 90367053
 Email: [email protected]
 Course website:
http://web.aeromech.usyd.edu.au/AMME27
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 (8th Edition), John
Wiley & Sons, Inc.
 Cogdell, J. R., Foundations of
Electrical Engineering (2nd Edition),
Prentice Hall
Instrumentation (AMME2700)
Introduction
Power Supply
Transducer
Signal Conditioning
Circuits
Amplifier
Command
Controller
Instrumentation (AMME2700)
Recorder
Data
Processor
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1028 positive charges and 51028
negative charges, balanced within trillions

one trillion is small compared to 1028: 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
dq
i
A
dt
 The voltage is the work (energy) required to
move a unit positive charge from – terminal
to the + terminal.
dw
v
dq
V
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
dw dw dt
v


dq dt dq
p  vi
w   vidt
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.
Instrumentation (AMME2700)