Claims
- 1. A method of measuring a melt temperature of a melt in a sample vessel, comprising:
- providing a sample vessel having a wall, the wall having at least a portion which is substantially transparent to infrared radiation, and having an interior wall surface comprising a material having an emission factor meeting the conditions:
- e>0.5 (1)
- and
- de/dT<0.001 (2)
- wherein e is an emission factor and de/dT is a derivative with respect to time of the emission factor;
- providing a melt contained within the sample vessel;
- providing an optical pyrometer, disposed outside the sample vessel; and
- measuring the melt temperature of the melt at the interior wall surface, using the optical pyrometer.
- 2. A method of measuring a melt temperature according to claim 1, further comprising:
- providing at least one thermocouple disposed substantially at a center of the melt in the sample vessel; and
- measuring a temperature with the thermocouple.
- 3. A method of measuring a melt temperature according to claim 1, further comprising:
- providing a guide rod having one end positioned at a measuring point located substantially at a center of the melt in the sample vessel and a second end disposed outside of the sample vessel, the guide rod acting to transmit infrared radiation from the measuring point to a pyrometric measuring device.
- 4. A method according to claim 3, wherein the guide rod is at least partially coated with a material meeting the following two conditions:
- e>0.5 (1)
- and
- de/dT<0.001 (2)
- wherein e is an emission factor and de/dT is a derivative with respect to time of the emission factor.
- 5. A method according to claim 1, wherein the coating comprises a ceramic material selected from the group consisting of: alumina, magnesia, mullite, zircon, titanium nitride, and boron nitride.
- 6. A method according to claim 1, wherein the melt is a metal melt.
- 7. A method according to claim 6, wherein the metal melt is a compacted graphite cast iron melt.
- 8. A method according to claim 1, further comprising:
- providing the vessel with at least one guide rod having a first end disposed at a measuring point substantially at a center of the melt in the sample vessel and a second end disposed outside the sample vessel, that portion of the guide rod disposed within the vessel being coated with a material meeting the following two conditions:
- e>0.5 (1)
- and
- de/dT<0.001 (2)
- wherein e is an emission factor and de/dT is a derivative with respect to time of the emission factor.
- 9. A method according to claim 1, further comprising, using the measured temperatures to perform thermal analysis of the melt.
- 10. A sample vessel for thermal analysis of a melt, comprising:
- a side wall;
- a bottom wall attached thereto such that the bottom and side walls can contain the melt;
- at least a portion of at least one of the walls of the vessel comprising a material which is substantially transparent to infrared radiation and having an inner wall surface coated with a material meeting the following two conditions:
- e>0.5 (1)
- and
- de/dT<0.001 (2)
- wherein e is an emission factor and de/dT is a derivative with respect to time of the emission factor;
- at least one temperature sensor, disposed to measure a temperature of the melt.
- 11. A sample vessel for thermal analysis of a melt according to claim 10, wherein at least one temperature sensor disposed to measure a temperature of the melt is an optical pyrometer.
- 12. An apparatus according to claim 10, further comprising:
- a guide rod having a first end disposed at a measuring point substantially at a center of the melt and a second end disposed outside of the sample vessel, that portion of the guide rod disposed within the vessel being coated with a material meeting the following two conditions:
- e>0.5 (1)
- and
- de/dT<0.001 (2)
- wherein e is an emission factor and de/dT is a derivative with respect to time of the emission factor.
- 13. A method according to claim 7, further comprising, using the measured temperatures to perform thermal analysis of the melt.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9600720-8 |
Feb 1996 |
SEX |
|
Parent Case Info
This application is the national phase of international application PCT/SE97/00304, filed Feb. 24, 1997 which designated the U.S.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/SE97/00304 |
2/24/1997 |
|
|
8/26/1998 |
8/26/1998 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO97/31248 |
8/28/1997 |
|
|
US Referenced Citations (13)