| 摘要 |
A method and apparatus is disclosed to determine a concentration of dopant i n soot that constitutes at least a portion of a soot preform (12) used to form an optical wave guide. The photon source (30) irradiates the soot preform on a mandrel (14). X-ray fluorescent emissions, from the irradiated soot are detected, and the concentration of dopant is determined based on the detecte d X-ray fluorescent emissions. Additionally, the concentration of dopant in layers of soot on the preform can be controlled by utilizing the detected X- ray fluorescent emissions to determine a deviation between a concentration o f dopant in the soot and a predetermined concentration, and adjusting depositi on conditions based on the deviation. |
