Methods and apparatus using fluorescent emissions to determine c

Details Methods and apparatus using fluorescent emissions to determine c Methods and apparatus using fluorescent emissions to determine c

1999-12-15

2000-11-14

Porta, David P.

X-ray or gamma ray systems or devices

Specific application

Fluorescence

378 45, G01N 23223

Patent

active

061480592

ABSTRACT:
A method and apparatus determine a concentration of dopant in soot that constitutes at least a portion of a soot preform used to form an optical waveguide. The soot is irradiated with photons, X-ray fluorescent emissions from the irradiated soot are detected, and the concentration of dopant is determined based on the detected X-ray fluorescent emissions. Additionally, the concentration of dopant in layers of soot on the soot preform can be individually determined. Furthermore, the manufacture of the soot preform can be controlled by utilizing the detected X-ray fluorescent emissions to determine a deviation between a concentration of dopant in the soot and a predetermined concentration, and adjusting deposition conditions based on the deviation.

REFERENCES:
patent: 3621245 (1971-11-01), Clayton et al.
patent: 4349736 (1982-09-01), Miller
patent: 5027379 (1991-06-01), Hunt et al.
patent: 5187727 (1993-02-01), Vogler et al.
patent: 5537451 (1996-07-01), Serebryakov et al.
patent: 6023496 (2000-02-01), Kuwabara

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