AE 242
Aerospace Measurements
Laboratory
Car driving
2
Car driving
Driver – get the sense from the environment and take decisions
: Speedometer to know the speed of the car
Driverless car – all the above is sensed and decisions are taken.
Accuracy, response time and content becomes very important.
3
Aircraft flight
During the aircraft operation environment changes drastically.
Accuracy is very important from safety considerations. Aircraft
instrumentation is very challenging. 4
Control
Driver Car
Focus of
the course
5
Control
Pilot Aircraft
Focus of
the course
6
Course content
Credit structure L-T-P-C 2-0-2-6
Characteristics of measuring systems: Calibration, sensitivity and error analysis.
Air data measurements: Pressure altitude, airspeed
Flow measurements: Hotwire anemometer, manometer, angle of attack sensor
Temperature Measurements: Thermocouples, hot gas and cryogenic
measurements, thermopiles
Strain measurements: Strain gage types, strain gage sensitivity.
Pressure measurements: Dependence of measurement dynamics on sensor
construction.
Inertial and GPS based sensors: Accelerometers and gyroscopes; position,
velocity and time measurements.
Attitude and heading reference systems: Errors in inertial sensors and
characterization.
Sensor interfacing: amplifiers, filters, and other signal conditioning
circuits, analog and digital conditioning, ADC/DAC, synchronous and
asynchronous serial communication.
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Course content
Text Books and references:
1.Doebelin, E., Measurement Systems: Application and Design, 4th Ed., McGraw-
Hill, New York, 1990.
2.Grewal, M. S., Lawrence, R. and Andrews, A., GPS, INS and Integration, New
York: John Wiley, 2001.
3.Collinson, R. P. G., Introduction to Avionics, Chapman and Hall, 1996.
4.Gayakwad, R. A., OPAMPs and Linear Integrated Circuits, 4th Ed., Pearson
Education, 2005.
5.Titterton, D. H. and Weston, J. L., Strapdown Inertial Navigation Technology,
2nd Ed., AIAA Progress in Astronautics and Aeronautics, Vol. 207, 2004.
6.Strang, G. and Borr, K., Linear Algebra, Geodesy and GPS, Wellesley-Cambridge
Press, 1997.
7.Doebelin, Ernest O. Manik, Dhanesh N., Doebelin’s Measurement System, 6th
Edition, New Delhi : Tata McGraw-Hill, 2011
8.Setup User Manuals and Component Data Sheets
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Important Instructions
Slot L2 Tuesday: 14:00-17:00; Slot L4 Friday: 14:00-17:00;
Per week two sessions of one hour lecture for everyone
Per week two session of two hours laboratory. Students have to
attend on Monday or Thursday as per the declared list.
80 % attendance rule in laboratory sessions
Students are allowed upto 10 minutes late during lectures
(Typically upto 2:10PM)
Laboratory attendance will be taken 15 minutes after the start of
laboratory session (typically it will 3:15 PM)
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Oscilloscope
Voltage
Time
Horizontal - time/div
Vertical - V/div
10
Oscilloscope
Horizontal - time/div = 0.1 sec/div
Vertical - V/div = 1 V /div
Window (Span)
Horizontal –> 10 x 0.1 = 1sec
Vertical –> 1 x 8 = 8 V
Voltage
Vertical -> +5 to -3 V
Marker is available to identify
Zero
zero position
Horizontal scale can be changed.
Vertical scale can be changed.
Zero position can be changed
Time
Horizontal - time/div
Vertical - V/div
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Function Generator
You can generate waveforms of different shapes, frequency, amplitude,
random signals etc.
12
Power Supply
Dual power supply: 0-15 V and 2 A current
Variable voltage and current limit
One can obtain -+15 V supply.
13
Transducers
Converts one form of energy to another
Shape memory alloy
Heat Transducer Mechanical
Thermocouple
Heat Transducer Voltage
Semiconductor
Heat Transducer Resistance
14
Evaluation
Credit structure L-T-P-C 2-0-2-6
Activity Weightage
Quizes 5-6 25
(15 minutes)
Mid-sem 20
End-sem 25
Viva 10
Journal 15
Project 5
Journal marks and project marks will be allotted based on
peer review
15
How many sensors are directly used by us in our daily
life?
How many sensors are used in a modern car?
How many sensors are used in a modern transport
aircraft?
How many sensors are used in a modern military aircraft?
Post your answer on moodle, along with source of
information.
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