How Do Two Color Pyrometers Work?

1. How Do Two Color Pyrometers Work?

2. Two Color Pyrometers

3. Two Color Pyrometers Two Color Pyrometer Brightness Pyrometer

4. Two Color Pyrometers

5. Two Color Pyrometers

6. Two Color Pyrometers • Reduction Ratio • Standard is 90% • Specials to 99% • Limited by • Low Emissivity • Object size • Obstructions

7. Two Color Pyrometers • E – Slope • Adjustable 0.85 to 1.15 • 1.0 is a graybody • Required for non-graybody targets • Required for non-graybody obstructions • Incorrect windows

8. Two Color Pyrometers Reflection Errors

9. Target Area Cone of Vision Two Color Pyrometers Cone of Vision

10. Background (Variable Temperature) Our Target is 1000°C: 1 – 5 are our cone of vision

11. Two Color Background Errors

12. Two Color Pyrometers No Achromatic Lens (Wavelengths out of focus) Achromatic Lens (Wavelengths in focus)

13. Two Color Pyrometers No Achromatic lens? The Pyrometer “sees” two images

14. Detector Methods - Ircon Speed of response: Approx. 10 milliseconds

15. Optical Mixer Ends Chopper Detector #1 Detector #2 Heater Two Detector Design Achromatic Lens Optical Mixer End Detector #1 Detector #2 Heater

16. Detector Methods – Filter Wheel Speed of Response: Approx. 3 Seconds

17. Steel •Slabs exiting Reheat Furnace •Coke from Furnace •Hot Strip Mill •Bar Mill •Rod Mill Glass •Gob Temperature •Melt Temperature •Glass Streams Metals •Molten Metals •Wire Drawing •Wire Annealing Heating •Induction Heaters •Vacuum Furnaces Applications for Two Color Pyrometers

18. Conclusions? Thank you for attending!