Precision metrology of NSTX surfaces using coherent laser radar ranging

Kugel, H.W. ; Loesser, D. ; Roquemore, A. L. ; Menon, M. M. ; Barry, R. E.

Princeton University. Plasma Physics Laboratory.

关键词: 70 Plasma Physics And Fusion Technology;    Laser Radiation;    Nstx Device;    Optical Radar;    Alignment;   

DOI  :  10.2172/758241
RP-ID  :  PPPL-3467
RP-ID  :  AC02-76CH03073
RP-ID  :  758241

美国|英语

来源: UNT Digital Library

【 摘 要 】

A frequency modulated Coherent Laser Radar ranging diagnostic is being used on the National Spherical Torus Experiment (NSTX) for precision metrology. The distance (range) between the 1.5 {micro}m laser source and the target is measured by the shift in frequency of the linearly modulated beam reflected off the target. The range can be measured to a precision of < 100{micro}m at distances of up to 22 meters. A description is given of the geometry and procedure for measuring NSTX interior and exterior surfaces during open vessel conditions, and the results of measurements are elaborated.