TY  - RPRT
TI  - Optical tip clearance sensor for aircraft engine controls
AU  - Poppel, G. L.
AU  - Marple, D. T. F.
AU  - Baumbick, R. J.
PY  - 1982
UR  - https://ntrs.nasa.gov/citations/19820054156
ID  - 19820054156
ER  -