Galvanneal Thermometry with a Thermographic Phosphor System
- Oak Ridge National Lab., TN (United States), Vehec, J.R. [American Iron and Steel Institute, Pittsburgh, PA (United States)
The accurate determination of temperature of galvanneal sheet emerging from a zinc bath is a challenging process measurement. The line moves at high speeds, up to 900 feet per minute, and the emissivity varies widely as it moves through the radio-frequency (RF) induction heating ovens and subsequently cools. This presents a great source of error if the pyrometric approach is used since the accuracy is sensitive to emissivity variation. This problem has been circumvented by an approach described here which uses a thermally sensitive phosphor technique for temperature measurement. For this, a small amount of a phosphor material is deposited on the liquid surface of the sheet. When the small layer of phosphor moves to the measurement station, it is illuminated by a short laser pulse which produces fluorescence from the material. The time dependence of the fluorescence indicates the temperature. Introduction of the microgram quantities of material has been shown to have no detrimental impact on product quality! This presentation describes a phosphor-based system for measuring temperature on a galvanneal manufacturing line. To date, measurements with an accuracy of +/- 5 deg F have been made at National Steel=s Midwest facility. This effort is a part of the Advanced Process Controls Program. The overall goal of the project is to provide accurate on-line temperature information that can be used to increase the yield and quality of the product, thereby reducing energy consumption and time.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 621540
- Report Number(s):
- CONF-9709109-1; ON: DE97008556; CNN: Grant DESAC05S-96-0-R22464; TRN: AD-A332 04
- Resource Relation:
- Conference: 1997 AISE annual convention and iron and steel exposition, Cleveland, OH (United States), 29 Sep - 2 Oct 1997; Other Information: DN: Prepared in cooperation with American Iron and Steel Inst., Pittsburgh, PA.Presented at 1997 AISE Annual Convention and Iron and Steel Exposition,Cleveland, OH, 29 Sep-2 Oct 97. [540 429900]; PBD: 1997
- Country of Publication:
- United States
- Language:
- English
Similar Records
Application of Phosphor Thermometry to a Galvanneal Temperature Measurement System
Application of phosphor thermometry to galvanneal processing