CCT/17-24 Czech Metrology Institute Temperature & Humidity & Thermal quantities CCT Meeting, Paris, 2017
Contact Thermometry • Contact thermometry: • ITS-90 temperature scale - Ar, Hg, TPW , Ga, In, Sn, Zn, Al- Cu, Al, Ag-Cu, Ag, Au, Cu, Pd, Pt • Measurements by comparison (-80 °C to 1800 °C) - alcohol, water, oil and salt baths, different types of furnaces with blocks (dry well) • Whole range CMC and Accreditation 2
Contact Thermometry - Alternative fixed points Inflex 𝑢 Al−Cu = 548.137 ± 0.004 °C Experiment with: 1/F 𝑢 Al−Cu = 548.149 ± 0.003 °C • CO 2 • Al-Cu • I 2 Inflex 𝑢 I 2 = 113.290 ± 0.006 °C CO 2 −56.564 ± 0,002 °C 1/F 𝑢 I 2 = 113.293 ± 0.003 °C CO 2 7h plateau , 80g 3
Contact Thermometry - Doping experiments CO 2 −56.564 ± 0,002 °C 0.15 • Sheill calculation of c, m, k 0.10 Difference from Ga113 (mK) • Modified Sheill 0.05 10.9.2014 12.9.2014 0.00 • Inflex x end point Ga0 Ga1 Ga2 Ga3 Ga4 26.9.2013 -0.05 • Proper mixing x waiting CO 2 7h plateo , 80g -0.10 time -0.15 • Doping as pure or oxide • Ga with Ni, Pb • Al with Ni, Pb 𝑔 𝑦 𝑗𝑛𝑞,𝑚 𝑙 0 − 1 𝐺 𝑙 0 −1 + 𝐿 1 − 𝐺 𝑙 0 −1 𝑈 𝑔,𝑗𝑛𝑞 𝐺 ≈ 𝑈 𝑔 − 𝐿 𝑔 𝑦 𝑗𝑛𝑞,𝑚 𝑙 0 − 1 4
Contact Thermometry - Doping experiments CO 2 −56.564 ± 0,002 °C 1000 1 000.0 y = 269.81x + 3.8624 0 800.0 0 20 40 60 80 -1000 Temperature diff ( µ K) 600.0 Temperature diff ( µ K) -2000 y = -131.35x + 136.4 -3000 400.0 Raoult μ K Rault µK Rault µK Raoult μ K -4000 200.0 -5000 inflex µK inflex µK y = 291.47x - 98.272 -6000 0.0 Optimalisation µK Optimalisation µK 0.0 1.0 2.0 3.0 -7000 y = -143.82x + 159.21 -200.0 -8000 -400.0 -9000 -10000 -600.0 Concentration ( µmol/mol) Concentration ( µmol/mol) 0.080 0.060 0.060 0.040 0.040 Temperature diff (°C) Temperature diff (°C) 0.020 0.020 Raoult μ K Rault Raoult μ K Rault 0.000 Inflex voltage Inflex voltage 0.000 0.0 20.0 40.0 60.0 -0.020 Inflex temperature 0 10 20 30 Inflex temperature -0.040 -0.020 Optimalisation Optimalisation -0.060 -0.040 -0.080 -0.060 -0.100 5 Concentration (µmol/mol) Concentration (µmol/mol) 5
Non – contact thermometry • Fixed points • In, Sn, Al and Cu • LP5 (650 nm and 1.6 µm) • Traceability for lower temperatures (<1000 °C) • SPRT • Pt-Au • 2015 – establishments of the radiation thermometry national standard in range (-30 to 1800) °C • Whole range CMC and Accreditation (-30 °C to 1800 °C) 6
Humidity Type 1 Type 2 Property Specification Specification air, nitrogen, methane, Medium air natural gas Pressure 101.325 kPa to 15 MPa atmospheric Dew point (-70 to +40) °C (-50 to +20) °C Uncertainty (0.08 to 0.5) °C (0.14 to 0.3) °C (k=2) 7
Thermal quantities- improvements High-Temperaure Guarded Hot Plate (HTGHP) • high-temperature thermal conductivity measurements for insulating materials • old heater plates are being replaced • investigation of new suitable material for heater plates up to 850 °C • was employed in EMRP Thermo inter- laboratory comparisons (2016) • using new high-temperature reference material developed in this project 8
Thermal quantities- improvements Small Guarded Hot Plate (SGHP) • new apparatus • employed in European metrology projects (EMRP VITCEA, EMPIR Eura- Thermal) • enables thermal conductivity measurements for composite materials, ceramics, etc. • double/single specimen • temperature range (0 to 80) °C 9
Thermal quantities- improvements Adiabatic calorimeter • heat capacity measurements • minor upgrades performed • employed in EMPIR VITCEA for heat capacity measurements of composite materials (CFRPs/GFRPs) • temperature range ~(0 to 80) °C 10
Areas of interests • Industrial thermometry • Using of alternative methods for uncertainty propagation in interpolation • Radiation thermometry for temperatures lower than 1000 °C • Thermal imagers • Humidity generators at elevated pressure • High temperature Guarded hot plates for insulation materials 11
THANK YOU FOR YOUR ATTENTION! Okružní 31, 638 00 Brno, Czech Republic, www.cmi.cz ČMI OI Praha, Radiová 3, 102 00 Praha 10, rstrnad@cmi.cz https://www.cmi.cz/sluzby_1012
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