institut national de métrologie (lne-inm/cnam) workshop 732 – november 23-24, 2006 1 past...
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1Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
2Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
G. Bonnier, 1974
3Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Main faults:
-Sensitive to pressure change (atmospheric + hydrostatic)
- Immersion condition changing with time
Main advantages:
- Simple to use
- No electronic devices
4Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Sensitive to atmospheric and hydrostatic pressure changes ?
Solution ?
Sensitive to atmospheric and hydrostatic pressure changes ?
Solution ?
5Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Sensitive to atmospheric pressure changes ?
Solution ?
6Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
1990 : The argon triple point by an adiabatic method –INM internal report
7Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
1990 : The argon triple point by an adiabatic method – F. Roussel – INM internal report
8Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Main faults:
- Not so easy to use
- Immersion condition changing with time
Main advantages:
- non sensitive to pressures changes
9Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
Not useful ?
N2 heat pipes
Argon gas
Liquid argon
1985
10
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
1985 : the argon triple point: Study of the thermal conditions –INM – internal report
11
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
1990 : An adiabatic calorimeter for calibration at the argon triple point –
INM- Tempmeko90
12
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
Maintaining the guard cell
13
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
2002 – “Argon Triple Point Device to Calibrate Long Stem Thermometers in Quasi Adiabatic Conditions” “Temperature” chicago
14
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
15
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
How to improve the immersion condition
16
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Future ways ?
Main faults on the “actual” system
-Sensitive to pressure change (atmospheric + hydrostatic)
- Immersion condition changing with time
Pressure regulation :
Reference: vacuum or temperature?
17
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Future ways ?
Our choice
Pressure regulator
thermometer
18
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Future ways ?
Main faults on the “actual” system
-Sensitive to pressure change (atmospheric + hydrostatic)
- Immersion condition changing with time
Level of liquid nitrogen ?
19
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Future ways ?
Our choices
Pressure regulator
Insulations
thermometer
Liquid nitrogen
20
Institut National de Métrologie (LNE-INM/CNAM) Workshop 732 – November 23-24, 2006
Past Improvements of the INM type Argon Device and Future Ways
Future ways ?
Our choicesPressure regulator
Liquid nitrogen
Filling tube
Guard cell
Experimental space (vacuum)
Thermal shield
Main cell