Device for measuring the temperature of a molten metal

Patent metadata

Field	Value
Publication number	US-9863709-B2
Application number	US-201514698214-A
Country	US
Kind code	B2
Filing date	Apr 28, 2015
Priority date	Apr 30, 2014
Publication date	Jan 9, 2018
Grant date	Jan 9, 2018

Abstract

A device for measuring the temperature of a melt, particularly of a molten metal, includes an optical fiber and a guiding tube having an immersion end and a second end opposite to the immersion end. The optical fiber is partially arranged in the guiding tube. An inner diameter of the guiding tube is larger than an outer diameter of the optical fiber. A first plug is arranged at the immersion end of or within the guiding tube proximate the immersion end of the guiding tube. The optical fiber is fed through the first plug and the first plug reduces a gap between the optical fiber and the guiding tube.

First claim

We claim:

1. A device for measuring the temperature of a melt comprising:
a guiding tube having an immersion end and a second end opposite to the immersion end, and
an optical fiber partially arranged in the guiding tube, an inner diameter of the guiding tube being larger than an outer diameter of the optical fiber,
wherein a first plug or a reduction of the inner diameter of the guiding tube is arranged at the immersion end of the guiding tube or within the guiding tube proximate the immersion end of the guiding tube,
wherein a second plug is arranged at the second end of the guiding tube or within the guiding tube proximate the second end of the guiding tube,
wherein the optical fiber is fed through the first and second plugs or the reduction of the inner diameter of the guiding tube, and
wherein the first and second plugs or the reduction of the inner diameter of the guiding tube reduce a gap between the optical fiber and the inner diameter of the guiding tube.

2. The device according to claim 1 , wherein at least one of the first plug and the second plug is elastic.

3. The device according to claim 1 , wherein the second plug is arranged within the guiding tube between the first plug or the reduction of the inner diameter of the guiding tube and the second end of the guiding tube.

4. The device according to claim 1 , wherein at least the first plug has a conical shape at least at its immersion end, and wherein a wall thickness of the first plug is reduced toward the immersion end.

5. The device according to claim 1 , wherein an inner diameter of at least the first plug is reduced toward the immersion end.

6. The device according to claim 1 , further comprising a fiber coil and a feeding mechanism for feeding the optical fiber and the guiding tube, the feeding mechanism comprising at least two independent feeding motors, one for feeding the optical fiber and one for feeding the guiding tube.

7. The device according to claim 6 , wherein the two independent feeding motors are each combined with a separate speed control.

Assignees

• Heraeus Electro Nite Int

Inventors

• Neyens Guido Jacobus
• Thys Michel
• Stevens Frank

Classifications

• G01J5/0821

  Optical fibres · CPC title

• G01J5/048

  Protective parts · CPC title

• C21C2005/5288

  Measuring or sampling devices · CPC title

• F27D11/08

  Heating by electric discharge, e.g. arc discharge · CPC title

• G01J5/004

  by molten metals · CPC title