Thermal measurements
facts and artifacts
Gábor Farkas
Budapest University of Technology (BME), Dept. of Electron Devices
Mentor Graphics MicReD Division, Budapest, Hungary
Thermal measurements - facts and artifacts
►
An informal tutorial for the OWL type
A very extensive topic
► not all details can be treated
► A more complete version can be downloaded from
►
►
http://www.eet.bme.hu/~farkas/SEMI26
Other useful link is
http://www.ipes.ethz.ch/ipes/2002thermal/thermisch.html
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Thermal measurements - facts and artifacts
► “already
the ancient Greek”
– a nice start for a scientific story
►
but this story is much older
I hope this
presentation
will run
smoothly
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Thermal measurements - facts and artifacts
► “already
the ancient Greek”
– Oops, may be, this is an
artifact?
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Thermal measurements - facts and artifacts
► OK, we corrected the
measurement error
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How it began
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Thermal engineers
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Thermal management, thermal measurements …
►
►
Success from the start
and also some mistakes, some failures, some fakes
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….and engineers in time and space
► We
usually consult
thermal engineers
material engineers
mechanical engineers
►
Electrical engineers are newcomers
with odd language, odd habits ☺
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►
Material engineering
Mechanical engineering
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– an ancient story again
Mechanical
engineering
Material
engineering
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The newcomers
►
►
Luigi Galvani
1737 - 1798
►
►
count Alessandro Volta
1745 - 1827
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The newcomers
►
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André-Marie Ampère
1775 - 1736
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Georg Simon Ohm
1789 - 1854
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Electronics engineers are people of
Continuous
reality
Potato
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Electronics engineers are people of
discretized brain
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Electronics engineers are people of
discretized brain
linearized brain
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Electronics engineers are people of
discretized brain
linearized brain
Linearized:
A Bear of
Very Little Brain can only
count until ONE when
making a Taylor series
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Task 1
We applied heaters here and there
We created sensors
► …. and the time passes
► How much is the temperature ?
►
►
Heaters
Sensors
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Task 2
We measure the temperature
response in time
► What is the structure ?
►
Heaters
Sensors
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Excitation and measurement
Heating is typically electric, when we have
wires towards our system
► but what before?
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Sensors can be
► contact or non-contact type
►
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Excitation and measurement
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Heaters can be
pointwise (chip?,laser)
surface (solar irradiation)
volume (induction, microwave)
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Sensors can be
pointwise (chip, thermocouple)
surface (LCD,infrared)
volume ???
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Sensors of our time
►
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Thomas Johann Seebeck
1770 - 1831
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An ambitious project
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Mapping of temperature distribution in pharmaceutical
microwave vacuum drying
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Excitation in volume, 3D
Thermal measurement in
volume
►
perhaps 2.5 is fair enough
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Modified arrangement
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Results in time and space
T [oC] [°C]
hőmérséklet
100
80
60
40
20
0
0
10
20
30
hűlési
idő [perc]
cooling
time [min]
P1
P2
P3
Few critical points in time
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Temperature map in several slices
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Results in 2.5D space
Corn starch, 1,2kW, after 15 min treatment
T [oC]
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One dimension less …
CPU + HS
Motherboard
controller
GPU heat!
Sensor
board
Temperature map in time of PCBs in a
computer
► IR camera cannot be placed between boards
►
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One dimension less …
(Before painted BLACK)
Temperature change [Celsius]
60
50
40
30
20
10
0
0
50
100
150
200
Time [sec]
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