Title :
Fibre-tip displacement sensor using sinusoidal FM-based technique
Author :
Venkatesh, Svetha ; Sorin, W.V.
Author_Institution :
Hewlett-Packard Labs., Palo Alto, CA, USA
Abstract :
A frequency modulated dual-electrode DFB laser is used as the optical source for a sensor which is immune to polarisation and acoustic fluctuations affecting its fibre-optic leads. Detection of the quadrature components of the reflected signal allows unambiguous direction determination. A measurement accuracy of +or-20 nm is demonstrated over a range of several millimetres.
Keywords :
displacement measurement; distributed feedback lasers; fibre optic sensors; frequency modulation; measurement by laser beam; optical modulation; dual-electrode DFB laser; fibre-optic leads; frequency modulated; optical source; quadrature components; reflected signal; sinusoidal FM-based technique;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19911033
