Title :
Interferometric fibre displacement/strain sensor based on source coherence synthesis
Author :
Berkoff, T.A. ; Kersey, A.D.
Author_Institution :
Sachs. Freeman Associates, Landover, MD, USA
fDate :
3/29/1990 12:00:00 AM
Abstract :
A displacement sensing technique is described, based on the use of a laser source frequency modulated at a relatively high rate to induce visibility modulation in the ´baseband´ interference signal derived from a two-beam interferometer. Feedback control of the laser modulation, to lock the visibility to a minimum, is demonstrated.
Keywords :
displacement measurement; frequency modulation; light interferometry; measurement by laser beam; optical modulation; strain measurement; displacement sensing technique; interferometric fibre displacement sensor; interferometric fibre strain sensor; laser modulation; laser source frequency modulated; source coherence synthesis; two-beam interferometer; visibility modulation;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900293
