"Using Scilab in the Radiation Thermometry Laboratory of Inmetro" By Ricardo Sohn, Instituto Nacional de Metrologia, Qualidade e Tecnologia - Inmetro for ScilabTEC 2015

1. Using Scilab in the
Radiation Thermometry Laboratory
of Inmetro (Lapir)
Mario A. P. Neto (maneto@inmetro.gov.br)
Ricardo S. T. M. Sohn (rsmoretz@inmetro.gov.br)

2. http://www.nist.gov/pml/wmd/metric/si-units.cfm
International System of Units (SI)

3. 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.

4. Examples of equations for primary thermometry
equation of state for
an ideal gas
Stefan-Boltzmann
equation

5. Fixed points of the ITS-90

6. Calibration at Lapir
Reference: contact thermometer
cavity radiation source
DMM
TC,
PRT
Scilab
Rad.
Therm.

7. cavity radiation source
DMMScilab
Transfer
Stand.
Rad.
Therm.
TC,
PRT
Calibration at Lapir
Reference: radiation thermometer

8. Realization of the ITS-90
fixed point cell
Scilab
Transfer
Stand.
cavity radiation source
DMM
TC,
PRT

9. New fixed point cells
Eutectic cell
Scilab
Transfer
Stand.

10. Scilab - GUIs
With This window we can:
- convert thermocouple emf to
Temperature and vice-versa;
- plot thermocouple curves

11. 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

12. Scilab - GUIs
'

13. Scilab - GUIs

14. Scilab - GUIs

15. Scilab - GUIs

16. 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.

17. Scilab - GUIs
answer

18. Scilab - GUIs

29. Data Acquisition
Rad. Therm.
Thermocouple
Rad. Therm.
DMM
GPIB ↔ USB
converter
Analog
output
Dig.
output
RS-232
USB
●
Hardware from NI
●
GPIB toolbox by
Tibault Reveyrand
●
Serial Comm. toolbox
●
Modbus toobox

30. Data Acquisition

31. Data Acquisition

32. Data Acquisition

34. 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

35. A little code

36. 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