Open AccessPrecision metrology of NSTX surfaces using coherent laser radar ranging
Author(s) -
H. Kugel,
D. Loesser,
A. L. Roquemore,
M. M. Me,
Robert E. Barry
Publication year - 2000
Language(s) - English
Resource type - Reports
DOI - 10.2172/758241
Subject(s) - ranging , metrology , optics , laser , radar , laser ranging , lidar , range (aeronautics) , dimensional metrology , physics , interferometry , materials science , geology , geodesy , engineering , aerospace engineering , composite material
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