Fiber optic displacement sensor with subangstrom resolution.
A simple Fabry-Perot interferometer that uses a singlemode bidirectional fiber coupler as a beam splitter is described. With light from a high stability He-Ne laser focused on the optic fiber, noise levels of 0.5-A rms equivalent reflector displacements were obtained in a bandwidth of 0.02-1 kHz.
Breen
S
S
Paton
B E
BE
Blackford
B L
BL
Jericho
M H
MH