180 likes | 1.22k Views
How Do Two Color Pyrometers Work?. Two Color Pyrometers. Two Color Pyrometers. Two Color Pyrometer. Brightness Pyrometer. Two Color Pyrometers. Two Color Pyrometers. Two Color Pyrometers. Reduction Ratio Standard is 90% Specials to 99% Limited by Low Emissivity Object size
E N D
Two Color Pyrometers Two Color Pyrometer Brightness Pyrometer
Two Color Pyrometers • Reduction Ratio • Standard is 90% • Specials to 99% • Limited by • Low Emissivity • Object size • Obstructions
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
Two Color Pyrometers Reflection Errors
Target Area Cone of Vision Two Color Pyrometers Cone of Vision
Background (Variable Temperature) Our Target is 1000°C: 1 – 5 are our cone of vision
Two Color Pyrometers No Achromatic Lens (Wavelengths out of focus) Achromatic Lens (Wavelengths in focus)
Two Color Pyrometers No Achromatic lens? The Pyrometer “sees” two images
Detector Methods - Ircon Speed of response: Approx. 10 milliseconds
Optical Mixer Ends Chopper Detector #1 Detector #2 Heater Two Detector Design Achromatic Lens Optical Mixer End Detector #1 Detector #2 Heater
Detector Methods – Filter Wheel Speed of Response: Approx. 3 Seconds
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
Conclusions? Thank you for attending!