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Title: Phosphor thermometry system

An apparatus for measuring the temperature of a moving substrate includes an air gun with a powder inlet port in communication with the outlet port of a powder reservoir, an air inlet port in communication with a pressurized air source, and an outlet nozzle spaced from and directed toward the moving substrate. The air gun is activated by the air pulses to spray controlled amounts of the powdered phosphor onto the moving substrate, where the phosphor assumes the temperature of the moving substrate. A laser produces light pulses, and optics direct the light pulses onto the phosphor on the moving substrate, in response to which the phosphor emits a luminescence with a decay rate indicative of the temperature of the phosphor. A collection lens is disposed to focus the luminescence, and a photodetector detects the luminescence focused by the collection lens and produces an electrical signal that is characteristic of the brightness of the luminescence. A processor analyzes the electrical signal to determine the decay characteristic of the luminescence and to determine the temperature of the phosphor from the decay characteristic.
Inventors:
 [1];  [2];  [3];  [1];  [4];  [5];  [1]
  1. (Knoxville, TN)
  2. (Tucson, AZ)
  3. (Oliver Springs, TN)
  4. (Vienna, AT)
  5. (Oak Ridge, TN)
Issue Date:
OSTI Identifier:
873258
Assignee:
American Iron and Steel Institute (Washington, DC) IDO
Patent Number(s):
US 6123455
Contract Number:
FC07-93ID13205
Research Org:
American Iron and Steel Institute (Washington, DC)
Country of Publication:
United States
Language:
English
Subject:
phosphor; thermometry; apparatus; measuring; temperature; moving; substrate; air; gun; powder; inlet; communication; outlet; reservoir; pressurized; source; nozzle; spaced; directed; activated; pulses; spray; controlled; amounts; powdered; assumes; laser; produces; light; optics; direct; response; emits; luminescence; decay; rate; indicative; collection; lens; disposed; focus; photodetector; detects; focused; electrical; signal; characteristic; brightness; processor; analyzes; determine; moving substrate; air source; controlled amounts; pressurized air; light pulses; electrical signal; air inlet; light pulse; detector detects; outlet nozzle; controlled amount; processor analyzes; phosphor emits; decay rate; photodetector detects; /374/