LAB 1: INTRODUCTION TO
LABVIEW AND
THERMOCOUPLES
PRESENTATION
MEMBERS:
TYLER CHANEY
DWIGHT STEPHENS,
JR.
NICK GOUGE
OSCAR RUIZ
JAMES VEITCH
JOSEPH RIEMAN
INTRODUCTIO
N/BACKGROU
ND
This lab revolved around the fundamentals of LabVIEW and how to
handle data collection/interpretation within the program based on
recording voltage signals from a thermocouple and the observation of
how measurement devices respond to changes in input conditions. The
lab also displayed the comparison of experimental results versus
expected results and how to incorporate them into our conclusions.
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APPARATUS
•
•
•
•
Computer with LabVIEW
Thermocouple
Ice water
Room-temperature water
Co
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MODELS
For all Thermocouples, the Voltage vs Temperature
relationship is slightly nonlinear, but a linear model was
approximated for the purposes of this experiment.
The hardware and software record the raw analog voltage
produced by the K – type thermocouple. Then by utilizing
empirical methods, the changes in measured voltage
are converted to change in temperature
Thermocouples don tactually "feel" the
temperature difference; instead, the two metals
create electrical pressure (voltage) only when there
is a temperature imbalance between the reference
junction and measurement junction. This is what
creates the voltage and by empirical methods we
can find temperature difference. This is called the
Seebeck effect.
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EXPERIMENT
1.1
• Focused on basic
navigation and setup
for experiment 1.2
• Introduced controls and
arithmetic functions to
be used in experiment
1.2 and future labs
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EXPERIMENT
1.1 CONT.
To implement these
controls and basic
functions set up knobs
that selected a value, and
gauges that would display
the sum and product of
the selected numbers.
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EXPERIMENT
1.2
Established a system
where the output voltage
of the thermocouple could
be recorded. We utilized
a DAQ assistant and a
connected waveform chart
in order to properly record
and display the data.
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EXPERIMENT
1.2 CONT.
The DAQ assistant allowed us
to connect the thermocouples
to the DAQ so a temperature
difference could be recorded.
Using this information, we could
find the voltage produced by
the thermocouple and produce
a waveform chart associated
with it. We were able to produce
waveform charts for various
different input conditions.
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RESULTS (STEADY STATE AT ROOM TEMPERATURE)
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RESULTS (STEADY STATE IN ICE WATER)
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RESULTS (HANDS TO AIR)
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RESULTS (ICE TO ROOM TEMPERATURE AIR)
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RESULTS (ICE TO ROOM TEMPERATURE
WATER)
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CONCLUSION
In this lab, we introduced ourselves to LabView by creating a virtual
instrument that allowed us to add and multiply two number together.
We were also able to utilize LabView to collect data using a
thermocouple to measure voltage. Overall, this lab was successful in
teaching us LabView basics and helped us understand how a change
in input of measuring devices like a thermocouple leads to a change in
output.
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