Czech Metrology Institute Temperature & Humidity & Thermal - - PowerPoint PPT Presentation

Czech Metrology Institute Temperature & Humidity & Thermal quantities

CCT Meeting, Paris, 2017

CCT/17-24

2

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

3

Contact Thermometry - Alternative fixed points

Experiment with:

• CO2
• Al-Cu
• I2

Inflex 𝑢Al−Cu = 548.137 ± 0.004 °C 1/F 𝑢Al−Cu = 548.149 ± 0.003 °C CO2 −56.564 ± 0,002 °C CO2 7h plateau, 80g Inflex 𝑢I2 = 113.290 ± 0.006 °C 1/F 𝑢I2 = 113.293 ± 0.003 °C

4

Contact Thermometry - Doping experiments

CO2 −56.564 ± 0,002 °C CO2 7h plateo, 80g

• Sheill calculation of c, m, k
• Modified Sheill
• Inflex x end point
• Proper mixing x waiting

time

• Doping as pure or oxide
• Ga with Ni, Pb
• Al with Ni, Pb
• 0.15
• 0.10
• 0.05

0.00 0.05 0.10 0.15 Ga0 Ga1 Ga2 Ga3 Ga4 Difference from Ga113 (mK) 10.9.2014 12.9.2014 26.9.2013

𝑈

𝑔,𝑗𝑛𝑞 𝐺 ≈ 𝑈 𝑔 − 𝐿 𝑔 𝑦𝑗𝑛𝑞,𝑚 𝑙0 − 1 𝐺𝑙0−1 + 𝐿 𝑔 𝑦𝑗𝑛𝑞,𝑚 𝑙0 − 1

1 − 𝐺 𝑙0−1

5 CO2 −56.564 ± 0,002 °C 5

y = 269.81x + 3.8624 y = 291.47x - 98.272

• 600.0
• 400.0
• 200.0

0.0 200.0 400.0 600.0 800.0 1 000.0 0.0 1.0 2.0 3.0 Temperature diff (µK) Concentration (µmol/mol) Rault µK inflex µK Optimalisation µK

Raoult μK

y = -131.35x + 136.4 y = -143.82x + 159.21

• 10000
• 9000
• 8000
• 7000
• 6000
• 5000
• 4000
• 3000
• 2000
• 1000

1000 20 40 60 80 Temperature diff (µK) Concentration (µmol/mol) Rault µK inflex µK Optimalisation µK

• 0.060
• 0.040
• 0.020

0.000 0.020 0.040 0.060 10 20 30 Temperature diff (°C) Concentration (µmol/mol) Rault Inflex voltage Inflex temperature Optimalisation

• 0.100
• 0.080
• 0.060
• 0.040
• 0.020

0.000 0.020 0.040 0.060 0.080 0.0 20.0 40.0 60.0 Temperature diff (°C) Concentration (µmol/mol) Rault Inflex voltage Inflex temperature Optimalisation

Raoult μK

Contact Thermometry - Doping experiments

Raoult μK Raoult μK

6

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)

7

Humidity

Property Type 1 Type 2 Specification Specification Medium air, nitrogen, methane, natural gas air Pressure 101.325 kPa to 15 MPa atmospheric Dew point (-70 to +40) °C (-50 to +20) °C Uncertainty (k=2) (0.08 to 0.5) °C (0.14 to 0.3) °C

8

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

9

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

10

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

11

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

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