scilabtec 2015 - inmetro
TRANSCRIPT
Using Scilab in the Radiation Thermometry Laboratory
of Inmetro (Lapir)
Mario A. P. Neto ([email protected])
Ricardo S. T. M. Sohn ([email protected])
http://www.nist.gov/pml/wmd/metric/si-units.cfm
International System of Units (SI)
International System of Units (SI)
1967: The name kelvin, symbol K, was adopted instead of “degree Kelvin”, symbol °K, and defined as “the fraction 1/273,16 of the thermodynamic temperature of the triple point of water”.
1954: The thermodynamic temperature scale was defined choosing the triple point of water as the fundamental fixed point, and assigning to it the temperature 273,16 degrees Kelvin, exactly.
1960: The name Système International d’Unités, with the abbreviation SI, was given to the system of units.
Examples of equations for primary thermometry
equation of state for an ideal gas
Stefan-Boltzmannequation
Fixed points of the ITS-90
Calibration at LapirReference: contact thermometer
cavity radiation source
DMM
TC,PRT
Scilab
Rad.Therm.
cavity radiation source
DMMScilab
Transfer
Stand.
Rad.Therm.
TC,PRT
Calibration at LapirReference: radiation thermometer
Realization of the ITS-90
fixed point cell
Scilab
TransferStand.
cavity radiation source
DMM
TC,PRT
New fixed point cells
Eutectic cell
Scilab
TransferStand.
Scilab - GUIs
With This window we can:
- convert thermocouple emf to Temperature and vice-versa;
- plot thermocouple curves
Scilab - GUIs
Standardized thermocouples: functions and coefficients into a new Scilab library,
thermo
Calibrated TC of Lab: functions from thermo and
coefficients into a worksheet
Scilab - GUIs
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Scilab - GUIs
Scilab - GUIs
Scilab - GUIs
Scilab - GUIs
With this window we can evaluate the temperature from:
- a photocurrent signal of the thermometer detector;
- responsivity spectral data
- reference signal and reference temperature etc.
Scilab - GUIs
answer
Scilab - GUIs
Data Acquisition
Rad. Therm.
Thermocouple
Rad. Therm.
DMMGPIB ↔ USB
converter
Analogoutput
Dig.output
RS-232
USB
● Hardware from NI● GPIB toolbox by Tibault Reveyrand
● Serial Comm. toolbox● Modbus toobox
Data Acquisition
Data Acquisition
Data Acquisition
In mind ...
● Create a unified GUI● Add a Help menu● Update code from 5.3.3 to 5.5.2 or newer● A new atoms module ● Add more languages
A little code
Credit of images
http://www.maniacworld.com/water-at-triple-point.html
http://images.all-free-download.com/images/graphiclarge/party_helium_balloons_clip_art_25507.jpg
http://www.bipm.org/utils/common/pdf/ITS-90/Guide-ITS-90-FixedPoints-RadiationThermometry-2015.pdf
(adapted)
Note: all images were accessed on May 20th, 2015